6416 TL-10-3 covers · 4 1-800-245-2580 BENEFITS and FEATURES FRICTION TORQUE LIMITERS, Type FC,are simple but effective and economical torque limiters designed to …

TORQUE LIMITERS RFC

Friction-Type FC

Ball Detent-Type BD

RINGFEDER CORPORATION TL-10-3

Introduction

Modern technology has enabled the designer to develop high performancemachinery. Higher speeds and efficiencies dictate more reliable performance.One proven method of increasing reliability is to employ the use of overload

protection devices in your equipment. RINGFEDER Corporation has the solution toyour needs with our RFC Torque Limiters.

RFC Torque Limiters are reliable, high quality mechanical overload protectiondevices. These devices protect personnel, equipment and property in the event of amechanical overload. We offer our overload devices in a variety of styles and incombinations with various couplings to meet your specific needs.

RFC Torque Limiters are available in Friction, Ball Detent and Axial type overloaddevices and they are easily adjustable over a range of torques.

Please contact us for specific design details.

Table of Contents

Friction Torque Limiters — Type FC . . . . . . . . . . . . . . . . . . . . . . 3

Ball Detent — Type BD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Limit Switch — Type LS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Axial Overload Device — Type AX . . . . . . . . . . . . . . . . . . . . . . . 35

2 1-800-245-2580

FRICTION TORQUE LIMITERSType FC

4 1-800-245-2580

BENEFITS and FEATURES

FRICTION TORQUE LIMITERS, Type FC, are simplebut effective and economical torque limiters designedto protect mechanical parts and machines fromdamage or destruction when an overload occurs. Theywill slip when the torque setting is exceeded. Once theoverload is removed, the Torque Limiter will continue totransmit the pre-set torque. Depending on the severityof the slippage and the exerted spring pressure on thefriction linings, the Torque Limiter would not have to bere-adjusted each time. Thus, they eliminate theproblems arising from machine down time caused bybreaking of unprotected parts.

Due to their predetermined slippage torque, they alsooffer dynamic dampening in case of sudden shockloads, accelerations, stops or motion reversals.

OPERATION

The driven component, such as a sprocket, gear, pulley,etc., as shown in Fig. 2 as ‘G’, is clamped between thetwo friction linings ‘C’ and centered on the hub ‘A’ bymeans of a bronze bushing ‘D’. By turning the adjustingnut ‘F’, the disc springs ‘E’ are compressed exerting aclamping force on the control element ‘B’ and the fric-tion linings which in turn clamp the driven component.

The transmissible torque is proportional to the clampforce which can be varied by turning the adjusting nut‘F’. It allows accurate and continuous setting of therequired torque. Once the desired torque setting isobtained, the adjusting nut must be locked in thisposition by means of a locking screw.

1. DRIVEN PARTS

The thickness of the driven parts (sprockets, gears,pulleys, etc.) must be less or equal to the max.thickness dimension G shown in the specifications. It isimportant that the contact surfaces are parallel,preferrably ground on both sides to provide a smoothrubbing surface of 65 to 125 micro-inches and be freeof rust, grease and oil. This will ensure good surfacecontact with the friction discs and transmission of ratedtorque values.

FRICTION TORQUE LIMITERS — Type FC

Fig. 1 Fig. 2

HOW TO ORDER

Specify Torque Limiter type, size, configuration and springorientation and desired bore.

Example 1:Friction Torque Limiter size 140 with Reduced Diameterand single layer springs with pilot bore —FC 140/RD SL Pilot Bore

Example 2:Random Reset Ball Detent Torque Limiter size 90 withextended hub and spring configuration 3 with 0.875finished bore and key —BDR 90.3/SH with 0.875 bore and key

1-800-245-2580 5

2. FRICTION DISC MATERIALS

It is recommended that the Friction Clutches be used indry condition. No oil or any other kind of liquid shouldget in contact with the friction discs since it will reducethe torque transmission capability. In applicationswhere contact with oil or other liquids is possible,please consult with us. Friction discs are made fromnon-asbestos materials that meet US and Europeanregulations.

To attain torque capacity, the clutch should be slippedseveral times at approximately 50% of its capacity toburnish the surfaces of the friction lining and drivecomponents.

After final setting, occasional adjustments may benecessary to compensate for friction lining wear.

3. TORQUE CAPACITIES and DISCSPRINGS CONFIGURATIONS

All Ringfeder FRICTION TORQUE LIMITERS, Type FCare available in two spring configurations:

Single Layer — SL and Double Layer — DL

Each overload device is shipped with the configurationthe customer specifies in their order. However, since

each device is shipped standard with two springs, thecustomer can reconfigure the springs themselves, ifrequired. Consult our installation instructions or call usfor assistance.

Additionally, Torque Limiters sizes 70 to 170 canaccommodate more springs to make a Triple Layerversion — TL. Please order the springs separately.

Since the compression force of double and triple layersprings is quite high, applications where there arefrequent slippages should be avoided. With frequentslippages, the friction linings may wear too quickly tobe economical.

In Figure 3, the relative relationship of the springconfigurations can easily be seen. The optimum torquesettings are in the upper portion of the torque curvewhich gives minimum torque variations (∆M) for a givenamount of wear (∆F).

3.1 HELICAL SPRINGS

Helical Springs are used for lower torque requirementsand they allow a more accurate torque adjustment thanthe disc springs. Therefore, there is also a reducedtorque variation due to lower wear on the frictionlinings.

Fig. 3 — Force/Travel relationships of various Spring Configurations.

TRIPLE

TORQUE M

FORCE F

DOUBLE

SINGLE

FOR

CE

TRAVEL

∆M

∆F

+

0

DISCSPRING

SINGLELAYER

DOUBLELAYER

TRIPLELAYER

SIZE70 to 170

BORE TOLERANCES

BORE RANGE TOLERANCE H8 TOLERANCE H7INCHES MM INCHES/1000 µm INCHES/1000 µm

OVER - TO OVER - TO0.24 - 0.4 6 - 10 + 0.9 / - 0 + 23 / - 0 + 0.6 / - 0 + 15 / -00.40 - 0.71 10 - 18 + 1.0 / - 0 + 25 / - 0 + 0.7 / - 0 + 18 / - 00.71 - 1.19 18 - 30 + 1.2 / - 0 + 30 / - 0 + 0.8 / - 0 + 21 / - 01.19 - 1.97 30 - 50 + 1.6 / - 0 + 41 / - 0 + 1.0 / - 0 + 25 / - 01.97 - 3.15 50 - 80 + 1.8 / - 0 + 46 / - 0 + 1.2 / - 0 + 30 / - 03.15 - 4.73 80 - 120 + 2.2 / - 0 + 56 / - 0 + 1.4 / - 0 + 35 / - 04.73 - 7.09 120 - 180 + 2.5 / - 0 + 63 / - 0 + 1.6 / - 0 + 40 / - 07.09 - 9.85 180 - 250 + 2.8 / - 0 + 71 / - 0 + 1.8 / - 0 + 46 / -0

6 1-800-245-2580

4. MOUNTING ONTHE SHAFT

Friction Torque Limiters areavailable either finish bored or witha pilot bore to allow the customerto do his own machining. Tables 1and 2 show suggested BoreTolerance and PermissibleRun-out.

The torque limiter can be attachedto the shaft in any of the waysshown below. (See Fig. 4)

a) Drive by means of a key andaxial positioning with a boltand end cap.

b) Drive by means of a key andaxial fixing with a set screwfrom the limiter body ontothe key.

c) Drive by means of a key anda set screw placed at the endof the limiter hub.

5. BRONZE BUSHING SIZING

The Friction Torque Limiters are supplied with a bronzebushing at its maximum length M in order to accommo-date the max. thickness G of the driven part. (See Fig.5a and 5b and corresponding specifications.)

If the thickness of the driven part is less than max. Gdim., then the bushing length has to be shortenedaccording to the following formula:

M = G + 1.5 x H M = required bushing lengthG = actual driven part thicknessH = friction disc thickness

Fig. 4

a) b) c)

Table 1

Table 2

Fig. 5a Fig. 5b

Permissible run-out

The maximum run-out of the friction surfaces in relation to the bore is given inthe table below:

G

HH

M M

Internal ChamferBearing Bushing

TORQUE LIMITER SIZE PERMISSABLE RUN OUT

IN. MM40, 50, 70, 90 0.002 0.05115, 140, 170 0.003 0.08200, 240, 300, 350 0.004 0.1

1-800-245-2580 7

6. TORQUE ADJUSTMENT

FC 40 - FC 170 Sizes: Make sure that the required discspring configuration (SL or DL) is installed. Loosen thelocking screw A (See Fig. 6) and tighten the adjustingnut with the proper spanner or hook wrench until aslight contact with the springs is established. Thentighten the adjusting nut further to obtain the pressurenecessary to transmit the required torque with-outslipping. Now check if slip occurs at the required torquevalue and then tighten the locking screw.

FC 200 - FC 350 Sizes: These larger units have aseries of smaller disc springs mounted on threadedholding pins which are threaded into the adjusting nut B(Fig. 7). Make sure that the required disc springconfiguration (SL or DL) is installed. Loosen the springholding pins C and make pre-adjustment of theadjusting nut. Then tighten the spring holding pins andcheck whether the required torque is obtained withoutslipping. If necessary, make required corrections in thesame manner. Detailed installation instructions areavailable upon request.

7. MAINTENANCE

The FC-Series torque limiters do not normally requireany maintenance. However, as with all friction torquelimiters, regular inspection of the friction surfaces andother related components is highly recommended. Thefriction pads should be replaced when they have eachworn to one quarter of their original, new thickness. Seedimension “H” in the specification tables for thethickness of new pads.

Table 3

Fig. 7

Fig. 8a Fig. 8b

DL Configuration

SL Configuration

Face WrenchHook Wrench

Fig. 6

B

B

CC

B

C

SL ConfigurationFC 200 - FC 350

DL ConfigurationFC 200 - FC 350

E

B

V

AC

FC BD V U PART NO. RANGE A B C WT g PART NO. DIA. RANGE E WT g40 27

704

3641046 18 - 40 5 150 5 90 51854 35 - 60 175 100

50 3970 90

551

41061 40 - 80 6 220 6 245 51870 60 - 90 250 280

90 110 6 68 41087 7 51888115 130 86 80 - 125 320 8 670140 160 8 105

411038 51912 115 - 230 420 1200

170 200 125 41111 125 - 200 450 10 1750

TORQUE LIMITER FACE WRENCH HOOK WRENCH

NOTE: Dimensions in millimeters, weight in grams (g) 1000g = 2.2046 lbs.V = Nominal pin diameter — Adjusting nut hole size U = Distance between holes in face of adjusting nut

8 1-800-245-2580

RFC FRICTION TORQUE LIMITERS FC...H

8(B

ore

in d

rive

elem

ent)



DL Spring Configuration

SL Spring Configuration

H8

(Hub

bor

e)

SIZE40507090115140170200240300350

MIN1.531425501101402404007001200

MAX7.515701252505507001200200035006000

MIN3.87.53563125275350600100017506000

MAX15301402505501100140024004000700012000

MIN——60120240480630————

MAX——20040080016002100————

A243044607692106120155185230

C40507090115140170202242300352

MIN58

101520253040506055

MAX1220253545556580

100120140

E22284050648090

105136165220

F8.511181921242931333653

MAX459

1115172024253030

H2.53444555566

BORE243845607285

100120145175237

L30385560708095

105120130165

M8

10151721252832354040

O35466382

105129159193230287334

(RPM)100007500560043003300270022001900160012501000

(kg)0.20.41

1.83.46

9.814

25.64284

SL DL TLDH8

BORE G IH8MAX

SPEED WEIGHTTORQUES (Nm)

METRIC Dimensions

SIZE40507090115140170200240300350

MIN1327125221443974123921243540619610620

MAX66133620110622134808619610621177023097953104

MIN3466310558110624343098531188511549053104

MAX133266123922134868973612392212433540561958106209

MIN——

5311062212442495576————

MAX——

1770354070811416218588

————

A0.941.181.732.362.993.624.174.726.107.289.06

C1.571.972.763.544.535.516.697.959.5311.8113.86

MIN0.200.310.390.590.790.981.181.571.972.362.17

MAX0.470.790.981.381.772.172.563.153.944.725.51

E0.871.101.571.972.523.153.544.135.356.508.66

F0.330.430.710.750.830.941.141.221.301.422.09

MAX0.160.200.350.430.590.670.790.940.981.181.18

H0.100.120.160.160.160.200.200.200.200.240.24

BORE0.9451.4961.7722.3622.8353.3463.9374.7245.7096.8909.331

L1.181.502.172.362.763.153.744.134.725.126.50

M0.310.390.590.670.830.981.101.261.381.571.57

O1.381.812.483.234.135.086.267.609.06

11.3013.15

(RPM)100007500560043003300270022001900160012501000

(lbs)0.40.92.24.07.513.221.630.856.0392.4184.8

SL DL TLDH8

BORE G IH8MAX

SPEED WEIGHTTORQUES (lb-in)

INCH Dimensions

1-800-245-2580 9

RFC FRICTION TORQUE LIMITERS —With Reduced Hub Diameter FC.../RD

DL Configuration

SL Configuration

SIZE7090115140

MIN8163264

MAX4080160320

MIN204080160

MAX80160320640

A597989104

C7090115140

MIN10152025

MAX25354555

E15172125

F9

111217

MAX9

111417

H4445

BORE45607285

L58708299

O6382105129

(RPM)2900220017001500

SL DLDH8

BORE G IH8MAX

SPEEDTORQUES (Nm)

METRIC Dimensions

SIZE7090115140

MIN71142283566

MAX35470814162832

MIN1773547081416

MAX708141628325664

A2.323.113.504.09

C2.763.544.535.51

MIN0.390.590.790.98

MAX0.981.381.772.17

E0.590.670.830.98

F0.350.430.470.67

MAX0.350.430.550.67

H0.160.160.160.20

BORE1.7722.3622.8353.346

L2.282.763.233.90

O2.483.234.135.08

(RPM)2900220017001500

SL DLDH8

BORE G IH8MAX

SPEEDTORQUES (lb-in)

INCH Dimensions

10 1-800-245-2580

RFC FRICTION TORQUE LIMITERS —With RD for Wide Components FC.../RDW

DL Configuration

SL Configuration

SIZE7090115140

MIN8163264

MAX4080160320

MIN204080160

MAX80160320640

A597989104

C7090115140

MIN10152025

MAX25354555

E30344250

F9

111217

MAX24283542

H4445

BORE45607285

L58708299

O6382105129

(RPM)2900220017001500

SL DLDH8

BORE G IH8MAX

SPEEDTORQUES (Nm)

METRIC Dimensions

SIZE7090115140

MIN71142283566

MAX35470814162832

MIN1773547081416

MAX708141628325664

A2.323.113.504.09

C2.763.544.535.51

MIN0.390.590.790.98

MAX0.981.381.772.17

E1.181.341.651.97

F0.350.430.470.67

MAX0.941.101.381.65

H0.160.160.160.20

BORE1.7722.3622.8353.346

L2.282.763.233.90

O2.483.234.135.08

(RPM)2900220017001500

SL DLDH8

BORE G IH8MAX


INCH Dimensions

1-800-245-2580 11

RFC FRICTION TORQUE LIMITERS —For Extra Wide Components FC.../EW

DL Configuration

SL Configuration

DL TLSIZE7090115140170

MIN142550110140

MAX70125250550700

MIN3563125275350

MAX14025055011001400

MIN60120240480630

MAX20040080016002100

A44607692106

C7090115140170

MIN1015182530

MAX2535455565

E4050648090

F1819212429

MIN2528366776

MAX40455792

132

H44455

BORE45607285

100

L94

102120170215

M455163

100140

N3034427584

O6382105129159

P1517212528

(RPM)56004300330027002200

DH8

BORETORQUES (Nm)

IH8GMAX

SPEEDSL

METRIC Dimensions

DL TLSIZE7090115140170

MIN1252214439741239

MAX6201106221348086196

MIN310558110624343098

MAX123922134868973612392

MIN5311062212442495576

MAX1770354070811416218588

A1.732.362.993.624.17

C2.763.544.535.516.69

MIN0.390.590.710.981.18

MAX0.981.381.772.172.56

E1.571.972.523.153.54

F0.710.750.830.941.14

MIN0.981.101.422.642.99

MAX1.571.772.243.625.20

H0.160.160.160.200.20

BORE1.7722.3622.8353.3463.937

L3.704.024.726.698.46

M1.772.012.483.945.51

N1.181.341.652.953.31

O2.483.234.135.086.26

P0.590.670.830.981.10

(RPM)56004300330027002200

DH8

BORETORQUES (lb-in)

IH8GMAX

SPEEDSL

INCH Dimensions

12 1-800-245-2580

RFC FRICTION TORQUE LIMITERS —With RD for Extra Wide Components

FC.../RDW-E

DL Configuration

SL Configuration

SIZE7090115140170

MIN8163264110

MAX4080160320550

MIN204080160550

MAX801603206401100

A597989104

119.5

C7090115140170

MIN1015202530

MAX2535455565

E1517212528

F9

11121718

MIN2528366776

MAX40455792

132

H44455

BORE45607285

100

L8594

111163204

M455163

100140

N3034427584

O6382105129159

(RPM)2900220017001500

*

SL DL GDH8

BORE IH8MAX

SPEEDTORQUES (Nm)

METRIC Dimensions

SIZE7090115140170

MIN71142283566974

MAX354708141628324868

MIN17735470814164868

MAX7081416283256649736

A2.323.113.504.094.70

C2.763.544.535.516.69

MIN0.390.590.790.981.18

MAX0.981.381.772.172.56

E0.590.670.830.981.10

F0.350.430.470.670.71

MIN0.981.101.422.642.99

MAX1.571.772.243.625.2

H0.160.160.160.200.20

BORE1.7722.3622.8353.3463.937

L3.353.704.376.428.03

M1.772.012.483.945.51

N1.181.341.652.953.31

O2.483.234.135.086.26

(RPM)2900220017001500

*

SL DL GDH8

BORE IH8MAX


INCH Dimensions

*Call Ringfeder Corporation for assistance.

1-800-245-2580 13

RFC FRICTION TORQUE LIMITERS —Chain Couplings FCC.../CH

SL Configuration

DL Configuration

SIZE507090115140170200240

MIN3142550110140240400

MAX157012525055070012002000

MIN7.535631252753506001000

MAX301402505501100140024004000

MIN—60120240480630——

MAX—20040080016002100——

A507090110130130150170

B202845556085

100120

C507090

115140170202242

D75

102126156200224291310

E355560708095

105120

F5785

108128145184208244

MIN1216202530304050

MAX30354555657590

110

MIN8

10152025304050

MAX20253545556580

100

O466382

105129159193230

KA0.200.250.300.350.400.500.801.00

KW30’30’30’30’30’30’30’30’

SL DL TLGH8

BOREHH8

BORETORQUES (Nm)

METRIC Dimensions

SIZE507090115140170200240

MIN27125221443974123921243540

MAX13362011062213480861961062117702

MIN6631055811062434309853118851

MAX2661239221348689736123922124335405

MIN—5311062212442495576——

MAX—

1770354070811416218588

——

A1.972.763.544.335.125.125.916.69

B0.791.101.772.172.363.353.944.72

C1.972.763.544.535.516.697.959.53

D2.954.024.966.147.878.82

11.4612.20

E1.382.172.362.763.153.744.134.72

F2.243.354.255.045.717.248.199.61

MIN0.470.630.790.981.181.181.571.97

MAX1.181.381.772.172.562.953.544.33

MIN0.310.390.590.790.981.181.571.97

MAX0.790.981.381.772.172.563.153.94

O1.812.483.234.135.086.267.609.06

KA0.0080.0100.0120.0140.0160.0200.0310.039

KW30’30’30’30’30’30’30’30’

SL DL TLGH8

BOREHH8

BORETORQUES (lb-in)

INCH Dimensions

Angular Misalignment

Kw

Axial Misalignment

Ka

RFC FRICTION TORQUE LIMITERS —Flexible Coupling Combination

14 1-800-245-2580

DL Configuration

SL Configuration

SIZE507090115140170

MIN3142550110140

MAX1570125250550700

MIN7.53563125275350

MAX3014025055011001400

MIN—60120240480630

MAX—20040080016002100

A427090110130150

MIN81020253035

MAX2545607085

100

C80

125155172193233

MIN8

1015202530

MAX202535455565

E507090

115140170

F385560708095

G40556070

100120

H354144628196

I182834384248

L93

124138170223264

O466382

105129159

(RPM)750056004300330027002200

KW3°3°3°3°3°3°

SL DL TLMAX

SPEEDDH8

BOREBH8

BORE

METRIC Dimensions

TORQUES (Nm)

SIZE507090115140170

MIN271252214439741239

MAX1336201106221348086196

MIN66310558110624343098

MAX266123922134868973612392

MIN—5311062212442495576

MAX—

1770354070811416218588

A1.652.763.544.335.125.91

MIN0.310.390.790.981.181.38

MAX0.981.772.362.763.353.94

C3.154.926.106.777.609.17

MIN0.310.390.590.790.981.18

MAX0.790.981.381.772.172.56

E1.972.763.544.535.516.69

F1.502.172.362.763.153.74

G1.572.172.362.763.944.72

H1.381.611.732.443.193.78

I0.7091.1021.3391.4961.6541.890

L3.664.885.436.698.78

10.39

O1.812.483.234.135.086.26

(RPM)750056004300330027002200

KW3°3°3°3°3°3°

SL DL TLMAX

SPEEDD

BOREB

BORE

INCH Dimensions

TORQUES (lb-in)


Kw

FCC.../FL

1-800-245-2580 15

RFC FRICTION TORQUE LIMITERS —MMS Coupling Combination FCC.../MS



Kr

Radial Misalignment Angular Misalignment Axial Misalignment

Kw Ka

*

*Note: Coupling construction may vary slightly depending on size. Please obtain exact design before ordering.

DL

SIZE40507090115140170200240300

MIN1.53142550110140240400700

MAX7.51570125250550700120020003500

MIN3.87.5356312527535060010001750

MAX153014025055011001400240040007000

MIN——60120240480630———

MAX——20040080016002100———

A55727896120120130145160192

MIN8101020252530354563

MAX3545506075758090100120

C9680

137170230230300300380380

MIN58

1015202530405060

MAX1220253545556580

100120

E38507090

115140170202242300

F28355560708095

105120130

G404852617575828997

116

H77

114127156202202230257290330

L104.5118141170206206256275327359

O35466382

105129159193230287

(RPM)9800710056004300330027002200190016001250

(kg)2.33.75.7

10.622.124.739.849

85.6124

KR0.50.60.60.70.90.91.01.21.41.6

KA1.01.01.01.21.21.21.51.51.51.5

KW1.01.21.31.51.71.71.82.02.22.4

MAXSPEED WEIGHT

DH8

BOREBH8

BORESLTORQUES (Nm)

DL TL

METRIC Dimensions

SIZE40507090115140170200240300

MIN13271252214439741239212435406196

MAX661336201106221348086196106211770230979

MIN34663105581106243430985311885115490

MAX133266123922134868973612392212433540561958

MIN——5311062212442495576———

MAX——

1770354070811416218588

———

A2.172.833.073.784.724.725.125.716.307.56

MIN0.310.390.390.790.980.981.181.381.772.48

MAX1.381.771.972.362.952.953.153.543.944.72

C3.783.155.396.699.069.06

11.8111.8114.9614.96

MIN0.200.310.390.590.790.981.181.571.972.36

MAX0.470.790.981.381.772.172.563.153.944.72

E1.501.972.763.544.535.516.697.959.53

11.81

F1.101.382.172.362.763.153.744.134.725.12

G1.571.892.052.402.952.953.233.503.824.57

H3.034.495.006.147.957.959.06

10.1211.4212.99

L4.114.655.556.698.118.11

10.0810.8312.8714.13

O1.381.812.483.234.135.086.267.609.06

11.30

(RPM)9800710056004300330027002200190016001250

(lbs)5.18.1

12.523.348.654.387.6

107.8188.3272.8

KR0.020.020.020.030.040.040.040.050.060.06

KA0.040.040.040.050.050.050.060.060.060.06

KW0.040.050.050.060.070.070.070.080.090.09

MAXSPEED WEIGHT

DH8

BOREBH8

BORESLTORQUES (lb-in)

TL

INCH Dimensions

16 1-800-245-2580

RFC Torque Limiters offer a variety of combinations to meet your specific needs.Please contact us for more information on any of the products shown below.

CAUTIONAll rotating equipment is potentially dangerous and must be properly guarded. It is the user’s responsibility to check forall applicable safety codes and provide suitable guards and protection.

RFC FRICTION TORQUE LIMITERS — Type FC

Fig. 9Friction Torque Limiter with Rust Proof Linings —FC.../RP

Fig. 10Friction Torque Limiter complete with Sprocket —FC.../SP

Fig. 12Friction Torque Limiter for lower torques — FC.../LT

Fig. 11Friction Torque Limiter with Axial adjustment — FC.../AX

Fig. 13Friction Torque Limiter with Overload signal — FC.../OS

Please contact usfor your specific needs.

BALL DETENT TORQUE LIMITERSType BD

18 1-800-245-2580

BENEFITS and FEATURES

BALL DETENT TORQUE LIMITERS, Type BD, areeconomical and effective mechanical devices designedto protect rotating machine components and machinesfrom damage or destruction in case of a jam-up or anoverload. When an overload occurs, the torque limiterwill quickly and accurately disengage at a pre-settorque value and trip an optional mechanical, optical orproximity limit switch. This limit switch signal is thenused to either alert an operator or shut-off the driveimmediately or do both simultaneously. The torquelimiter should be set to a torque value that is higherthan the normal start-up and operating torque, but lessthan the possible higher torque that could causedamage to the weakest drive train component.

Our units, designed with the highest quality materialsand workmanship and in accordance to ISO 9000standards, offer the following features:

• Reliable, accurate and consistent disengagementat the set torque value — it depends only on discsprings and balls or rollers.

• Easily adjustable over a wide torque range — tomeet specific needs of operating and start-upconditions.

• Operate in either direction of rotation.

• Quick and automatic resetting — reduction ofexpensive downtime.

• Two types available:Type BDR — Automatic Random ResetType BDS — Automatic Single Position Reset

• Each is available in various Models to meet avariety of specific requirements.

OPERATING PRINCIPLE

Torque transmission between a shaft SH and a drivencomponent G is achieved by means of a series ofcaged drive balls or rollers E which are seated indetents in opposing faces of fixed pressure flange Cand sliding control element B. They are held underpressure by disc springs F which are compressed byadjusting nut L. The adjusting nut is threaded onto hubA and it is used for easy adjustment of desired releasetorque setting. The control element B is splined to thehub A which is keyed to shaft SH. Please refer to Fig.15. This whole assembly rotates as one and provides apositive drive under normal operating conditions (SeeFigs. 16 and 19.1).

When a jam or an overload occurs and the torquereaches the pre-set value, the balls start to roll out fromtheir detents overcoming the thrust of the spring loadand forcing the control element to move axially. At thispoint, the switch plate S which is attached to thecontrol element starts making contact with the limitswitch LS (Figs. 19.2 and 17). With the overloadincreasing further, the balls roll completely out of theirdetents and the additional axial movement H of thecontrol element and switch plate trips the limit switch(Figs. 18 and 19.3, 4).

This signal should be used to shut-off the drivepromptly and alert the operator. If the overload is notremoved, the limiter will continue to “trip out” until theoverload is removed. However, the limiter must not beallowed to ratchet for any extended time in order toprevent wear and damage of the ball or roller seatsurfaces.

BALL DETENT TORQUE LIMITERS — Type BD

Fig. 14 Fig. 15

SH

LS

S

1-800-245-2580 19

OPERATING DETAILS

Fig. 16

Fig. 19

Fig. 18

Fig. 17

Normal Operation

LSC BS

M (Torque)

Release Time

12

3

4

t

Full Disengagement

LSC BS

H (Travel)

1. EngagedC

C

C

C

B

B

B

B

a S

S

S

S

H2

LS — On

LS — On

LS — Off

LS — Off

2. Start Overload

3. Start Disengagement

4. Full Disengagement

a

H3a

Hmaxa

20 1-800-245-2580

FUNCTION

There are two Basic Types available:

TYPE BDR — Automatic Random ResetThe BDR Limiter has a series of caged balls seated inequally spaced detents between the pressure flange Cand control element B (See Fig. 20). Upon receiving anoverload, the balls roll from their initial location to theadjacent detent causing an axial movement of thecontrol element. This movement actuates a mechanicallimit switch or a proximity sensor to shut down thedrive. After the overload is removed, the balls settle inthis new position and the limiter is automatically reset.If the overload is not removed, the limiter will continueto “trip out” until the overload is removed. However, thelimiter must not be allowed to ratchet through for anyextended time in order to prevent wear or damage tothe ball seating surfaces.

TYPE BDS — Automatic Single Position ResetThe BDS Limiter functions on the same principle as theBDR except that it uses a series of rollers instead ofballs. The rollers are arranged in a specific pattern andkept captive in the pressure flange (See Fig. 21).Matching detents are provided in the control element.

When an overload occurs, the rollers slide out of theirdetents forcing the control element to move axially tocontact the limit switch. During rotation with the rollersout of their detents, sliding occurs between rollers andthe ground, smooth surface of the control element,assuring a low residual torque. If necessary, thisresidual torque can be reduced further by replacing thebronze bushing D with a needle bearing.

Since the rollers are arranged in an irregular pattern,they will meet their corresponding detents again onlyafter one full revolution. This guarantees a fullysynchronized re-engagement.

When the overload has been removed, the limiter isautomatically reset to it’s original position by clockwiseor counter clockwise rotation. If the overload is stillpresent, the limiter will continue to rotate through itsdetent setting until the overload is removed or themachine is stopped. Here again the limiter must not beallowed to rotate for a long time.

Other available combinations of re-engagementpositions, upon request, are: 1/2, 1/3, 1/4, 1/5, 1/6 ofa revolution.

Fig. 20

LS

S

Fig. 21

LS

S

1-800-245-2580 21

GENERAL INFORMATION

TORQUE ADJUSTMENT

BD Torque Limiters up to and including Size 200Torque adjustments are easily achieved by turning theadjusting nut incrementally to compress the discsprings, thereby increasing the torque settingproportionately. A face or hook wrench (Table 3) is usedfor this purpose. Once the desired torque setting isreached, the locking screw located in the adjusting nutshould be tightened.

The BDR and BDS Torque Limiters have three possibletorque ranges per unit size depending on the thicknessand orientation of the disc springs (See Fig. 20).

BD Torque Limiters Sizes 230 and LargerAs with the larger Friction Torque Limiters, the torquesetting is accomplished with a series of smallerdiameter disc spring packs mounted on an adjustingscrew which are screwed into the adjusting nut. Byusing 3, 6 or 12 spring packs and varying the adjustingscrew travel, three torque setting ranges per unit sizecan be achieved.

For details, please refer to the Torque RatingSpecifications.

Mounting on the ShaftThe Torque Limiter should be keyed to the shaft to avoidslipping. If it is fitted on the end of the shaft, it is usuallysecured with a bolt and an end cap (See Fig. 20). If it isto be mounted midshaft, appropriate shoulders orspacers are required.

Torque Limiter hubs can be supplied with a pilot bore orfinished bore with recommended bore tolerances perTable 1 and a square keyway per ANSI B17.1 if nototherwise specified.

Attachment of the Driven ComponentThe driven component G, such as sprocket, sheave,timing belt pulley, etc., is generally bolted to the flangeC by means of provided tapped holes (See Fig. 20 andspecifications in the catalog).

Please note that the basic model of the Torque Limiteris not suitable to support radial loads.

Therefore, the driven component G must be supportedon the shaft by means of a bearing or bushing asshown in Fig. 20.

There are various other models available with extendedsupport hubs to meet this requirement as illustrated inthis catalog.

Drive Shut-Down on OverloadWe highly recommend that in all applications anautomatic mechanism, such as a limit or proximityswitch, be provided to quickly shut down the drivewhen an overload condition occurs. All our BD-TorqueLimiters are equipped with a Switch Plate S whichgenerates an axial movement H to trip or actuate thelimit switch (See Figs. 16 and 19). For this purpose, wealso offer our own, special limit switch (See pg. 34).

MaintenanceThe drive balls or rollers and bronze bushings or needlebearings of our units are packed with grease atassembly. Under normal, reasonably clean conditions orwith suitable cover, the unit should perform properlywith an annual inspection and regreasing. However, foroperation in adverse, ambient operating conditions, ourengineering department should be consulted.

GENERAL SAFETY PRECAUTIONS

RFC Torque Limiters are manufactured for reliability andhigh standard of workmanship.

Similar to all mechanical devices each application mustbe considered on its own merits with regard to safety(i.e. lifting equipment, explosive conditions, etc.).

All rotating equipment is potentially dangerous andmust be properly guarded. It is the user’s responsibilityto check for all applicable safety codes and providesuitable guards and protection. Our staff is alwaysavailable to discuss special applications.

HOW TO ORDER

Specify Torque Limiter type, size, configuration and springorientation and desired bore.

Example 1:Friction Torque Limiter size 140 with Reduced Diameterand single layer springs with pilot bore —FC 140/RD SL Pilot Bore

Example 2:Random Reset Ball Detent Torque Limiter size 90 withextended hub and spring configuration 3 with 0.875finished bore and key —BDR 90.3/SH with 0.875 bore and key

22 1-800-245-2580

APPLICATIONSThere are a multitude of applications for Torque Limitersin combination with sprockets, sheaves, timing beltpulleys, gears, flexible couplings, etc. in:

Packaging MachineryTextile MachineryConveying EquipmentAssembly MachinesAutomation and Feeding EquipmentMachine ToolsFood Processing MachinesMaterial Handling EquipmentWood Working MachinesChemical Processing Equipment

SELECTION GUIDEThe wide range of mounting configurations and torquecapacities of our Torque Limiters makes it easy to find astandard unit to meet your requirements.

Step 1:Since the Torque Limiter is intended to protect theweakest member of the drive train, it should always belocated as close as possible to the component beingprotected.

Recommended locations for BDR or BDS limiter areshown in Figs. 22, 23 and 24. When other locations arenecessary, please consult with us.

Step 2:Determine overload release torque by one of thesemethods:

a) Calculate theoretical running torque at selectedlimiter location using the following equation and aservice factor K (Table 4) for start-up, high inertiastarts or peak load conditions.

Release Torque (in-lbs) = HP x 63,000 x KRPM

b) Determine “weak link” in drive train and it’smaximum torque rating. The selected overloadrelease torque must be lower than the maximumtorque rating of the “weak link”.

Step 3:Determine bore sizes and keyways.

a) Shaft size at Torque Limiter location determinesLimiter bore size.

b) Shaft size at coupling location determinescoupling bore size. (If applicable!)

Step 4:Select from the specification tables the Torque Limitersize and model that meets your requirements or contactus for assistance.

Table 4

Fig. 22

Fig. 23

Fig. 24

Hydraulic Motor 4/6 Cyl. 1/3 Cyl.Driving Machine Electric Motor Combustion Eng. Combustion Eng.

Standard smoothrunning 1 - 1.1 1.2 - 1.3 1.5

Uneven running withslight shocks 1.3 - 1.5 1.7 - 2 2.5

Uneven running withmedium shocks andcounterweight 1.8 - 2 2.3 - 2.5 3

Uneven running withcounter weights andstrong shocks 2.3 - 2.5 2.8 - 3 3.5

Motor

Flexible Coupling Overload Device

Reducer Machine

Driven Machinery

Driven Machinery

DrivingMember

DrivingMember

Overload DeviceHigh Speed Side

Overload DeviceLow Speed Side

BD_70 .1BD_70 .2BD_70 .3

BD_90 .1BD_90 .2BD_90 .3

BD_110 .1BD_110 .2BD_110 .3

BD_130 .1BD_130 .2BD_130 .3

BD_160 .1BD_160 .2BD_160 .3

BD_200 .1BD_200 .2BD_200 .3

BD_230 .1BD_230 .2BD_230 .3

BD_270 .1BD_270 .2BD_270 .3

556

755

654

654

654

755

SLSLDL

SLSLSL

SLSLSL

SLSLSL

SLSLSL

SLSLSL

36

12

36

12

0/10/20/2

1/11/21/3

2/12/22/3

3/13/23/3

4/14/24/3

5/15/25/3

2.55

10

61225

122550

2550

100

50100200

90180350

150300600

250500

1000

51020

122550

2550

100

50100200

100200400

180350700

300600

1200

50010002000

4300

2150

2880

1440

2360

1180

2000

1000

1660

830

1360

680

600

500

51020

122550

2550

100

50100200

100200400

175350700

300600

1200

50010002000

102040

2550

100

50100200

100200400

200400800

350700

1400

60012002400

100020004000

1430710315

980480240

790390200

660330160

550270130

400200100

———

———

20

25

35

45

55

65

75

100

1-800-245-2580 23

TORQUE RATING SPECIFICATIONS

TORQUELIMITER

SIZE

NUMBEROF

SPRINGS

SPRINGARRANGE-

MENTSPRING

TYPE MIN MAX

BDRMAX SPEED

(RPM)MIN MAX

BDSMAX

SPEED(RPM)

MAXSHAFTSIZEMM

TORQUES BDR (Nm) TORQUES BDS (Nm)

NUMBER OF SPRING PACKS

METRIC SPECIFICATIONS

BD_70 .1BD_70 .2BD_70 .3

BD_90 .1BD_90 .2BD_90 .3

BD_110 .1BD_110 .2BD_110 .3

BD_130 .1BD_130 .2BD_130 .3

BD_160 .1BD_160 .2BD_160 .3

BD_200 .1BD_200 .2BD_200 .3

BD_230 .1BD_230 .2BD_230 .3

BD_270 .1BD_270 .2BD_270 .3

556

755

654

654

654

755

SLSLDL

SLSLSL

SLSLSL

SLSLSL

SLSLSL

SLSLSL

36

12

36

12

0/10/20/2

1/11/21/3

2/12/22/3

3/13/23/3

4/14/24/3

5/15/25/3

224489

5389

221

106221443

221443885

443885

1770

79715933098

132826555310

221344258851

4489

177

106178443

212443885

443885

1770

88517703540

159331866196

26555310

10621

44258851

17701

4300

2150

2880

1440

2360

1180

2000

1000

1660

830

1360

680

600

500

4489

177

106221443

221443885

443885

1770

88517703540

154930986196

26555310

10621

44258851

17701

89177354

212443885

443885

1770

88517703540

177035407081

30986196

12391

53101062121242

88511770135403

1430710315

980480240

790390200

660330160

550270130

400200100

———

———

0.78

1.00

1.375

1.75

2.187

2.56

2.953

3.937

TORQUELIMITER

SIZE

NUMBEROF

SPRINGS

SPRINGARRANGE-

MENTSPRING

TYPE MIN MAX

BDRMAX SPEED

(RPM)MIN MAX

BDSMAX

SPEED(RPM)

MAXSHAFTSIZEINCH

TORQUES BDR (IN-LBS) TORQUES BDS (IN-LBS)

NUMBER OF SPRING PACKS

INCH SPECIFICATIONS

24 1-800-245-2580

RFC BALL DETENT TORQUE LIMITERS —Basic Unit: Sizes 70-200

BDR/BDS...



Det. XVersion with Bearing isAvailable on Request

SIZE7090110130160200

A6690110130160194

C5585105125148176

MIN81015202528

MAX202535455565

E80105130150180220

F334444

G304757698598

H1.42,93.03.03.54.5

BORE41608090

105120.5

L46627486

105124.5

M8

1215152020

N3.03.03.54.04.04.5

O4258708299

118

P487292

108125155

Q668

101214

R44446

6.5

QTY666666

SIZEM5M6M6M8

M10M12

T426382105129159

(kg)0.51.52.74.79.819.2

DH8

BORE IH7 S WEIGHT

METRIC Dimensions

SIZE7090110130160200

A2.603.544.335.126.307.64

C2.173.354.134.925.836.93

MIN0.310.390.590.790.981.10

MAX0.790.981.381.772.172.56

E3.154.135.125.917.098.66

F0.120.120.160.160.160.16

G1.181.852.242.723.353.86

H0.060.080.120.120.140.18

BORE1.6142.3623.1503.5434.1344.744

L1.812.442.913.394.134.90

M0.310.470.590.590.790.79

N0.120.120.140.160.160.18

O1.652.282.763.233.904.65

P1.8902.8353.6224.2524.9216.102

Q0.240.240.310.390.470.55

R0.160.160.160.160.240.26

QTY666666

SIZEM5M6M6M8

M10M12

T1.652.483.234.135.086.26

(lbs)1.13.35.910.321.642.2

DH8

BORE IH7 S WEIGHT

INCH Dimensions

1-800-245-2580 25

RFC BALL DETENT TORQUE LIMITERS —Basic Unit: Sizes 230-270

BDR/BDS...


SIZE230270

A225265

C189229

MIN3848

MAX75100

E250290

F55

G104122

H5.06.0

BORE136168

L122141

M1823

N5.15.6

O115133

P1515

Q1618

R78

QTY66

SIZEM12M16

T183227

U200240

V190230

Z99

A1

22.526.5

B1

160200

C1

3839

D1

5975

SIH7DH8

BORE

METRIC Dimensions

SIZE230270

A8.8610.43

C7.449.02

MIN1.501.89

MAX2.953.94

E9.84

11.42

F0.200.20

MAX4.094.80

H0.200.24

BORE5.356.61

L4.805.55

M0.710.91

N0.200.22

O4.535.24

P0.590.59

Q0.630.71

R0.280.31

QTY66

SIZEM12M16

T7.208.94

U7.879.45

V7.489.06

Z0.350.35

A1

0.891.04

B1

6.307.87

C1

1.501.54

D1

2.322.95

SIH7DH8

BORE

INCH Dimensions

G

26 1-800-245-2580

RFC BALL DETENT TORQUE LIMITERS —With Short Supported Hub: Sizes 70-200

BDR/BDS.../SH




SIZE7090110130160200

A6690110130160194

C5585105125148176

MIN81015202528

MAX202535455565

E80105130150180220

F334444

G304656688598

H1.22.02.33.03.03.0

BORE38506080

100120

L598093

106130152

M8

1215152020

N3.03.03.54.04.04.5

O46627486

105124.5

P487292

108125155

Q668

101214

R1318192025

27.5

QTY666666

SIZEM5M6M6M8

M10M12

T426382

105129159

U8.51012121619

V4.5856

8.58.5

DH8

BORE IH7 S

METRIC Dimensions

SIZE7090110130160200

A2.603.544.335.126.307.64

C2.173.354.134.925.836.93

MIN0.310.390.590.790.981.10

MAX0.790.981.381.772.172.56

E3.154.135.125.917.098.66

F0.120.120.160.160.160.16

G1.181.812.202.683.353.86

H0.050.080.090.120.120.12

BORE1.4961.9692.3823.1503.9374.724

L2.323.153.664.175.125.98

M0.310.470.590.590.790.79

N0.120.120.140.160.160.18

O1.812.442.913.394.134.90

P1.8902.8353.6224.2524.9216.102

Q0.240.240.310.390.470.55

R0.510.710.750.790.981.08

QTY666666

SIZEM5M6M6M8

M10M12

T1.652.483.234.135.086.26

U0.330.390.470.470.630.75

V0.180.310.200.240.330.33

DH8

BORE IH7 S

INCH Dimensions

1-800-245-2580 27

RFC BALL DETENT TORQUE LIMITERS —With Short Supported Hub: Sizes 230-270

BDR/BDS.../SH


SIZE230270

A225265

C189229

MIN3848

MAX75100

E250290

F55

G104122

H3.54.0

BORE130160

L153175

M1823

N5.15.6

O122141

P1515

Q1618

R3134

QTY66

SIZEM12M16

T183227

U200240

V190230

Z99

IH7 SDH8

BORE

METRIC Dimensions

SIZE230270

A8.8610.43

C7.449.02

MIN1.501.89

MAX2.953.94

E9.8411.42

F0.200.20

G4.094.80

H0.140.16

BORE5.126.30

L6.026.89

M0.710.91

N0.200.22

O4.805.55

P0.590.59

Q0.630.71

R1.221.34

QTY66

SIZEM12M16

T7.208.94

U7.879.45

V7.489.06

Z0.350.35

IH7 SDH8

BORE

INCH Dimensions

SIZE230270

A1

22.526.5

B1

160200

C1

4547

D1

5975

E1

119

F1

2025

METRIC Dimensions

SIZE230270

A1

0.871.04

B1

6.307.87

C1

1.771.85

D1

2.322.95

E1

0.430.36

F1

0.790.99

INCH Dimensions

28 1-800-245-2580

RFC BALL DETENT TORQUE LIMITERS —With Extended Hub for Wider Components:Sizes 70-200

BDR/BDS.../EH




SIZE7090110130160200

A6690110130160194

C5585105125148176

MIN81015202528

MAX202535455565

E80105130150180220

F334444

G304757698598

H1.42.03.03.03.54.5

BORE284054667890

L7498

114135160182

M8

1215152020

N3.03.03.54.04.04.5

O46627486

105124.5

P487292

108125155

Q668

101214

R2836404955

57.5

QTY666666

SIZEM5M6M6M8

M10M12

T—15172125—

U—45607285—

V426382105129159

DH8

BORE IH7 S

METRIC Dimensions

SIZE7090110130160200

A2.603.544.335.126.307.64

C2.173.354.134.925.836.93

MIN0.310.390.590.790.981.10

MAX0.790.981.381.772.172.56

E3.154.135.125.917.098.66

F0.120.120.160.160.160.16

MAX1.181.852.242.723.353.86

H0.060.080.120.120.140.18

BORE1.1021.5752.1262.5983.0713.543

L2.913.864.495.316.307.17

M0.310.470.590.590.790.79

N0.120.120.140.160.160.18

O1.812.442.913.394.134.90

P1.8902.8353.6224.2524.9216.102

Q0.240.240.310.390.470.55

R1.101.421.571.932.172.26

QTY666666

SIZEM5M6M6M8

M10M12

T—

0.590.670.830.98—

U—

1.772.362.833.35—

V1.652.483.234.135.086.26

DH8

BORE IH7G S

INCH Dimensions

1-800-245-2580 29


RFC BALL DETENT TORQUE LIMITERS —With Extended Hub for Wider Components:Sizes 230-270

BDR/BDS.../EH

SIZE230270

A225265

C189229

MIN3848

MAX75100

E250290

F55

G104122

H5.06.0

BORE108135

L187213

M1823

N5.15.6

O122141

P1515

Q1618

R6572

QTY66

SIZEM12M16

T183227

U200240

V190230

Z99

A1

22.526.5

B1

160200

C1

4547

D1

5975

SIH7DH8

BORE

METRIC Dimensions

SIZE230270

A8.8610.43

C7.449.02

MIN1.501.89

MAX2.953.94

E9.84

11.42

F0.200.20

MAX4.094.80

H0.200.24

BORE4.255.31

L7.368.39

M0.710.91

N0.200.22

O4.805.55

P0.590.59

Q0.630.71

R2.562.83

QTY66

SIZEM12M16

T7.208.94

U7.879.45

V7.489.06

Z0.350.35

A1

0.891.04

B1

6.307.87

C1

1.771.85

D1

2.322.95

SIH7DH8

BORE

INCH Dimensions

G

30 1-800-245-2580

RFC BALL DETENT TORQUE LIMITERS —BDR Limiter – Flexible Coupling Combination

BDR/BDS.../CF




SIZE7090110130160200

A407090110130150

MIN81020253035

MAX2545607085100

C80125155172193233

MIN81015202528

MAX202535455565

E80105130150180220

F334444

G40556070

100120

H1.4

20.03.03.03.54.5

I182834384248

L115158183211269322

M577589

103127154

N4258708299

118

O44617689

112132

P426382105129159

KW3º3º3º3º3º3º

DH8

BOREBH8

BORE

METRIC Dimensions

SIZE7090110130160200

A1.572.763.544.335.125.91

MIN0.310.390.790.981.181.38

MAX0.981.772.362.763.353.94

C3.154.926.106.777.609.17

MIN0.310.390.590.790.981.10

MAX0.790.981.381.772.172.56

E3.154.135.125.917.098.66

F0.120.120.160.160.160.16

G1.572.172.362.763.944.72

H0.060.080.120.120.140.18

I0.7091.1021.3391.4961.6541.890

L4.536.227.208.31

10.5912.68

M2.242.953.504.065.006.06

N1.652.282.763.233.904.65

O1.732.402.993.504.415.20

P1.6542.4803.2284.1345.0796.260

KW3º3º3º3º3º3º

DH8

BOREBH8

BORE

INCH Dimensions


Kw

1-800-245-2580 31

RFC BALL DETENT TORQUE LIMITERS —BDR Limiter w/Torsionally Rigid, Flexible Coupling

BDR/BDS.../CR




SIZE7090110130160200

A6690110130160194

MIN101015202528

MAX304045556580

C4256637791112

MIN81015202528

MAX202535455565

E80105130150180220

F334444

G304757698598

H1.42.03.03.03.54.5

I354045556580

L46627486

105124.5

M1520202228

29.5

N55557090

110130

O889

121417

P124145173210257301

Q151177209253308364

R598093

106130152

S8398

115145165205

T426382

105129159

KR0.300.300.350.450.600.70

KA1.31.41.51.71.82.1

KW45’45’45’45’45’45’

DH8

BOREBH8

BORE

METRIC Dimensions

SIZE7090110130160200

A2.603.544.335.126.307.64

MIN0.390.390.590.790.981.10

MAX1.181.571.772.172.563.15

C1.652.202.483.033.584.41

MIN0.310.390.590.790.981.10

MAX0.790.981.381.772.172.56

E3.154.135.125.917.098.66

F0.120.120.160.160.160.16

G1.181.852.242.723.353.86

H0.060.080.120.120.140.18

I1.3781.5751.7722.1652.5593.150

L1.812.442.913.394.134.90

M0.590.790.790.871.101.16

N2.172.172.763.544.335.12

O0.310.310.350.470.550.67

P4.8825.7096.8118.26810.11811.850

Q5.946.978.239.96

12.1314.33

R2.323.153.664.175.125.98

S3.273.864.535.716.508.07

T1.652.483.234.135.086.26

KR0.010.010.010.020.020.03

KA0.050.060.060.070.070.08

KW45’45’45’45’45’45’

DH8

BOREBH8

BORE

INCH Dimensions


Kw

Kr

Radial Misalignment

Axial Misalignment

Ka

32 1-800-245-2580

RFC BALL DETENT TORQUE LIMITERS —Basic Low Torque Unit BDR.../LT


Version .1

Version .2

SIZE90110130

MIN51015

MAX253080

MIN51015

MAX5060160

A90110130

C85105125

MIN101520

MAX253545

E105130150

F344

G475769

H233

BORE608090

L7489

108

M121515

N3

3.54

O7085

104

P7292

108

Q68

10

R444

QTY666

SIZEM6M6M8

T6382105

IH7 SDH8

BORE.1TORQUES (Nm)

.2

METRIC Dimensions

SIZE90110130

MIN4489133

MAX221266708

MIN4489133

MAX4435311416

A3.544.335.12

C3.354.134.92

MIN0.390.590.79

MAX0.981.381.77

E4.135.125.91

F0.120.160.16

MAX1.852.242.72

H0.080.120.12

BORE2.3623.1503.543

L2.913.504.25

M0.470.590.59

N0.120.140.16

O2.763.354.09

P2.8353.6224.252

Q0.240.310.39

R0.160.160.16

QTY666

SIZEM6M6M8

T2.483.234.13

IH7G SDH8

BORE.1TORQUES (lb-in)

.2

INCH Dimensions

1-800-245-2580 33

RFC BALL DETENT TORQUE LIMITERS —Basic Low Torque Unit BDS.../LT


Version .1

Version .2

SIZE90110130

MIN102030

MAX5060160

MIN102030

MAX100120320

A90110130

C85105125

MIN101520

MAX253545

E105130150

F344

G475769

H233

BORE608090

L7489

108

M121515

N3

3.54

O7085

104

P7292

108

Q68

10

R444

QTY666

SIZEM6M6M8

T6382105

IH7 SDH8

BORE.1TORQUES (Nm)

.2

METRIC Dimensions

SIZE90110130

MIN89177266

MAX4435311416

MIN89177266

MAX88510622832

A3.544.335.12

C3.354.134.92

MIN0.390.590.79

MAX0.981.381.77

E4.135.125.91

F0.120.160.16

MAX1.852.242.72

H0.080.120.12

BORE2.3623.1503.543

L2.913.504.25

M0.470.590.59

N0.120.140.16

O2.763.354.09

P2.8353.6224.252

Q0.240.310.39

R0.160.160.16

QTY666

SIZEM6M6M8

T2.483.234.13

IH7G SDH8

BORE.1TORQUES (lb-in)

.2

INCH Dimensions

34 1-800-245-2580

APPLICATION

This Limit Switch has been developed for applicationsin connection with our BD-Torque Limiters andAX-Overload Limiters. It is used for fast and accuratemonitoring of the axial disengagement movement of thecontrol element. The limit switch gives a signal to eitherswitch off the drive or alert the operator or initiate anyother control function.

DESIGN

The micro switch, mounted in an aluminum housing, isactuated by a uni-directional control lever. The housinghas two diagonally arranged mounting holes.

A Zero-position adjustment of the control lever is pro-vided by moving it either to the right or left a maximumof 5mm in either direction. This is accomplished with anexternal adjustment screw or the side of the housing.

• Mechanically driven switch• Contact load: 250V AC/15A• Switching contact: 24V DC/6A

60V DC/1.5A - 250V DC/0.2A• Protection: IP 54• Temperature range: -10°C ÷ +85°C• MAX frequency: 240/min.• Feeler stroke (to the contact): 0.5 mm (0.197")• After-contact stroke: 5 mm ÷ 10 (0.197" to 0.394")

(according to the “0” position).• Feeler adjusted through the external screw

LIMIT SWITCH — Type LS/1

Wiring Diagram

Overall Dimensions (Shown in millimeters)

Fig. 26

Fig. 25

AXIAL OVERLOAD LIMITERSType AX

36 1-800-245-2580

APPLICATIONSThe Axial Overload Limiters are used in applicationswhere cam or crank actuated mechanisms create linearmotions and transmit axial forces in links, connectingrods or slides. For example: packaging machines,machine tools, transfer lines or any other machinesequipped with linear motion components.

To protect these machines or components againstpossible excessive and destructive axial forces, ourAxial Overload Limiters can be applied verysuccessfully.

OPERATING PRINCIPLEThe axial force is transmitted through the Limiter inboth directions, i.e. push or pull, and without anybacklash. As it can be seen in Fig. 35, the operatingprinciple is very simple and is based on the use of balls(2) which are located in a tapered groove of the limitershaft (1) and held in position in three, equally spacedholes of the limiter body (6).

The one end of the limiter body has an external threadonto which the adjusting nut (4) is screwed on and theother end has the fastening flange.

A coil spring (5) is located between adjusting nut (4)and sleeve (3). As the adjusting nut (4) is turned, spring(5) is pressing against sleeve (3) and through its internaltaper the necessary thrust is exerted to keep the balls(2) under a minimum preload.

To set the limiter to a desired axial overload releasevalue, the adjusting nut has to be turned further togenerate the required pressure on sleeve (3). Since therelease load or force is directly proportional to theadjusting nut travel, the force-travel diagrams for the dif-ferent axial limiter sizes should be referred to (Page 39).

The shaft of the Basic Axial Limiter (See Fig. 27) hastapped holes at both ends for attachment of rod ends,extension bars (7) or guide bars (8). These extensionstogether with guide tubes (9) fitted to the flange at oneend of the limiter body (6), allow a certain free,telescoping travel of the limiter shaft after thedisengagement at overload has occured.

When an overload occurs, the shaft is pushed or pulledaxially causing the balls to be forced out radially fromthe shaft groove. In doing so, they make sleeve (3)move axially. This axial movement (H) can be used toactuate a limit switch for the purpose of signaling analarm and/or shutting down the drive.

Another method for detecting the overload motion, isthe use of a proximity switch positioned over the oblonghole in the guide tube to sense the movement of theguide bar (8). An adjustable limit switch mounting block(10) attachable to the guide tube (9) can be provided.

Once the overload has been removed, the limiter willreengage automatically on reverse stroke or it can bereengaged manually.

AVAILABILITYThe Axial Overload Limiters are available in four differentsizes and with various types of springs for each size.Extensions type (7 & 8) as well as tubes (9) are availablefor each size to meet the requirements of commonlyused free strokes or travel. Please refer to the Specifica-tions. Other sizes are available upon request.

MAINTENANCEThe Axial Overload Limiters are supplied greased andoiled and do not require any particular maintenanceunder normal operating conditions. However, whenoperation in dusty or aggressive environments isintended, please contact our technical department.

AXIAL OVERLOAD LIMITERS — Type AX

1 Limiter Shaft2 Balls3 Sleeve4 Adjusting Nut5 Spring6 Limiter Body7 Extension Bar8 Guide Bar9 Guide Tube

10 Limit Switch Mounting Block

Fig. 27

1-800-245-2580 37

RFC AXIAL OVERLOAD LIMITERS AX.../BTZ

Above units are supplied with a mounting block for micro or proximity switch.*Upon request, the Limiters can be supplied for higher or lower disengaging forces and with different free strokes.

SIZE12.7512.90

A1212

B2424

CM8M8

DM8M8

E12.512.5

F2525

G8395

H22

I3030

L367534

M194208

N3030

O5858

P85238

Q1515

RM5M5

S1818

T66

U3535

V2020

Z3030

DIST X*425580

MM.7590

A1

4444

CENTERMAX

TRAVEL-

METRIC Dimensions

SIZE12.7512.90

A0.470.47

B0.940.94

CM8M8

DM8M8

E0.490.49

F0.980.98

G3.273.74

H0.080.08

I1.181.18

L14.4521.02

M7.648.19

N1.181.18

O2.282.28

P3.359.37

Q0.590.59

RM5M5

S0.710.71

T0.240.24

U1.381.38

V0.790.79

Z1.181.18

DIST X*16.7322.83

IN.2.953.54

A1

1.731.73

CENTERMAX

TRAVEL-

INCH Dimensions

38 1-800-245-2580

RFC AXIAL OVERLOAD LIMITERS AX.../S

Basic Torque Limiter

Complete with Standard Extensions

Above units are supplied with standard extensions and a mounting block for micro or proximity switch.Upon request, the Limiters can be supplied for higher or lower disengaging forces and with different free strokes.

SIZE142030

MM.50100150

AH7

142030

B456080

C354560

DH7

203040

EH7

111422

FM10X1M12X1M20X1

G91015

H1

2.54

IM5X6M6X6M8X6

L120150194

M242934

N101115

O86110145

P234

Q81011

R456080

S182232

T91217

U8914

V81116

ZH7

111422

————

————

MAXTRAVEL-

METRIC Dimensions

SIZE142030

A1

M10X1M12X1M20X1

B1

121620

C1

81012

D1

152025

E1

7910

F1

M10M14

M20X1.5

G1

122025

I1

6810

L1

81011

M1

202638

N1

5.56.58.5

O1

51010

P1

121212

Q1

91424

R1

8.512.512.5

S1

202525

T1

3075120

U1

182028

V1

M5M5M5

Z1

777

a182335

b303550

c151520

d404463

SIZE142030

IN.3.945.915.91

AH7

0.550.791.18

B1.772.363.15

C1.381.772.36

DH7

0.791.181.57

EH7

0.430.550.87

FM10X1M12X1M20X1

G0.350.390.59

H0.040.100.16

IM5X6M6X6M8X6

L4.725.917.64

M0.941.141.34

N0.390.430.59

O3.394.335.71

P0.080.120.16

Q0.310.390.43

R1.772.363.15

S0.710.871.26

T0.350.470.67

U0.310.350.55

V0.310.430.63

ZH7

0.430.550.87

————

————

MAXTRAVEL-

INCH Dimensions

SIZE142030

A1

M10X1M12X1M20X1

B1

0.470.630.79

C1

0.310.390.47

D1

0.590.790.98

E1

0.280.350.39

F1

M10M14

M20X1.5

G1

0.470.790.98

I1

0.240.310.39

L1

0.310.390.43

M1

0.791.021.50

N1

0.220.260.33

O1

0.200.390.39

P1

0.470.470.47

Q1

0.350.550.94

R1

0.330.490.49

S1

0.790.980.98

T1

1.182.954.72

U1

0.710.791.10

V1

M5M5M5

Z1

0.280.280.28

a0.710.911.38

b1.181.381.97

c0.590.590.79

d1.571.732.48

1-800-245-2580 39

OVERLOAD RELEASE FORCE ADJUSTING DIAGRAMS

Size 12/BTZ Size 14 - 20 - 30

o = initial position of adjusting nut (see specification tables).

LBS

LBSLBS

LBS

INCHES INCHES

INCHESINCHES

Size 12 Size 14

Size 20 Size 30

Fig. 28 Fig. 29

Approximate overload trip point (lbs.) setting for a given travel from initial position (inches)

RINGFEDER CORPORATION165 Carver AvenueP.O. Box 691Westwood, N.J. 07675TEL (201) 666-3320 • FAX (201) 664-6053

Los Angeles Office: Tel (805) 382-9900 • FAX (805) 382-9980

This publication may not be reproduced, either partly or wholly, without the source being quoted. TL-10-3 10/04 GP Printed in U.S.A© 1999 by Ringfeder Corporation.

In accordance with our established policy to constantly improve our products, the specifications contained herein are subject to change without notice.

Since our Engineers cannot be aware of all applications and cannot control all the factors that may affect the function of our products, our warranty applies toour products only.

TECHNICAL ASSISTANCECall us Toll Free at 1-800-245-2580

Please let us know what your specific requirementsare and we shall be very happy to work out detailed recom-mendations without any obligation. Just send a sketch withyour requirements and specifications.

Call or write for more informationVisit our website: www.ringfeder.com

Our Representative:

RING-flex®

Double Flexing Couplings withRingfeder® Shrink Discs®

Assure a totally backlash-free con-nection with precise synchronizationcapability. Additional features:Clearance fits for hub/shaft connec-tion allow easy assembly and freeaxial movement compensation dur-ing installation which eliminatesunwanted pre-loading or pre-stress-ing of the flexible elements.

ARCUSAFLEX® FlywheelCouplingsHighly flexible, backlash-free, vul-canized rubber disc couplingsdesigned to couple the flywheel ofan internal combustion engine to theshaft of the driven machine. Rubberdisc element accepts relatively highangular, axial and parallel misalign-ments. Flange dimensions accord-ing to SAE J.620 standards.

Multi Mont OCTA FlywheelCouplingsTorsionally flexible, economicalflange couplings for connecting theflywheel of a combustion engine tothe input shaft of a driven machine.Rubber elements dampen vibrationsand accommodate misalignments.

We also Supply . . .RINGFEDER®

KEYLESS SHAFT-HUB LOCKING DEVICES Request Separate Catalogs!

LOCKING ELEMENTS™(Internal Locking Devices)

LOCKING ASSEMBLIES™(Internal Locking Devices)

SHRINK DISCS®

(External Locking Devices)

Documents

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