Presentation v belt drives

WELCOME

TO

SEMINAR

ON

V-BELTS & DRIVES

V-BELTS

RAW EDGE COGGED BELTS

SPACE SAVER WEDGE BELTS

POLY-V BELTS

TOP RUBBER

LOAD CARRYING CORDS

BASE RUBBER

RUBBER IMPREGNATEDFABRIC JACKET

INCLUDED ANGLE 40º

CROSS–SECTION OF V-BELT

STIFF YET FLEX-CRACK RESISTANT POLYMER POLY FLOCK (POLY-F) COMPOUND FOR HIGHER LIFE

RUBBERISED POLYESTER-COTTON BLENDED JACKET FOR FLEXIBILITY, BETTER TRACTION, FLEX & WEAR RESISTANCE

NEOPRENE IMPREGNATION & SPECIAL ADDITIVES MAKE BELTS HEAT RESISTANT, OIL RESISTANT & ANTI-STATIC SPECIAL ‘HMLS’ (HIGH MODULUS LOW STRETCH) POLYESTER CORDS CARRY HIGHER LOADS WITH MINIMUM STRETCH

THE UNIQUE “HSS” PROCESS OF HEAT STRETCHING & LENGTH SETTING ENSURES THAT BELTS RETAIN THE TENSION AND STAY MATCHED NOT ONLY IN STORAGE BUT ALSO ‘ON THE DRIVE’.

BELTS REQUIRE `ONE SHOT TENSIONING’ SO YOU CAN ‘FIT THEM & FORGET THEM’……..

TYPES OF V-BELTS & SECTION


• Wedge Belts drives are extraordinarily compact as they are capable of handling more power in a given space over Classical V-Belts of A, B, C, D & E Sections.

• Narrower in cross section increases support for tension members in Wedge Belts and hence can not buckle.

• Due to wedge belt pulley compactness reduce overhung thus improving the bearing life and in totality reducing the initial drive cost


Option-1 Option-2

Motor Pulley size 660 mm Pitch Dia. with 34 Grooves of E-Section

660 mm Pitch Dia. with 36 Grooves of SPC-Section


Pulley Face Width 1540 mm. 935 mm. 832 mm.

Weight (approx.) 1500 Kg. 915 Kg. 850 Kg.

COST (approx.) Rs. 1.75 Lac Rs. 1.45 Lac. Rs. 1.30 LacDriven Pulley size

1575 mm Pitch Dia. with 34 Grooves of E-Section



Pulley Face Width 1540 mm. 935 mm. 832 mm.

Weight (approx.) 4100 Kg. 2780 Kg. 2544 Kg.

COST (approx.) Rs. 5.50 Lac Rs. 4.40 Lac Rs. 3.90 Lac

Belt Size E-418 / E-10710 x 34 Pcs. SPC-10600 x 36 Pcs. SPC-10600 X 32 Nos.

COST (approx.) Rs. 2.65 Lac @ 7835/- Rs. 1.30 Lac @ 3631/-Rs. 1.16 Lac @3631

TOTAL COST Rs. 9.90 Lac Rs. 7.15 Lac Rs. 6.36 Lac

Description E-Section V-Belt Drive SPC-Section Wedge Belt Drive

For a 1500 HP drive with 740 R.P.M. Motor and Driven speed of 310 R.P.M.,

The conventional E-section drive Vs SPC-Section Wedge Belt Drive details :-

The distinct benefits of the Wedge Belt Drive are :- 1. The total Pulley-Belt package cost reduces by

∀• Option –1 : 28% (approx.)∀• Option – 2 : 36% (approx.)

2. The replacement cost of belts would reduce by

∀• Option – 1 : 51% (approx.)∀• Option – 2 : 56% (approx.)

3. Reduces shaft Bending moments & Bearing loads improving the Bearing life substantially due to lighter weight / lesser face width of SPC Wedge belt pulleys. 4. Improves power transmission efficiency.

LENGTH STABLE POLYESTER CORD

MOULDED COG

FABRIC

POWERFLEX RAW EDGE COGGED BELTS



Features

Very high flexibility due to moulded cogs.

Excellent transverse rigidity because of Polychloroprene rubber based compound with an-isotropic fiber orientation.

Very low stretch due to use of length stable polyester cords prepared with special adhesives.

Higher power rating of up to 30% over wrapped V-Belts. Three times more life. The higher power rating of Power flex means that they have more kW hours built into them. So they last 3 times longer when replacing wrapped V-belts utilising existing pulleys.

Low slip due to better arc of contact and pulley to belt geometrical relationship. Energy loss reduced to an absolute minimum.

Drive ratios of 1:12 are possible which can eliminate multi-stage drives.

PRODUCT DETAILS

CAN BE PRODUCED IN HIGH POWER CONSTRUCTIONS ALSO.

N - SPECIFIES THE NO. OF BELTS PER BAND

BELT CROSS-SECTION

66" - 148"

66" - 148"

66" - 590"

66" - 148"

SIZE RANGE

BANDED BELTS - CLASSICAL & WEDGE

3V

SECTION

C

B

A

MAX. NO. OF BELTS/BANDTHICKNESS, mm

10.30 x N

25.40 x N

19.05 x N

15.38 x N

BELT WIDTH, mm

10.00

17.00

13.00

10.00

10.30

25.40

19.05

15.38

PITCH, mm

6

4

6

8

5V 105" - 175" 17.50 x N 16.00 17.50 6

525.5021.0025.50 x N105" - 590"SPC

176" - 590"5V 17.50 x N 16.00 17.50 5

BANDED V BELTS

ELIMINATE BELT WHIP, BELT TWIST AND BELT

TURN OVER

IDEAL FOR DRIVES WHERE PULSATING

LOADS ARE PRESENT

DO NOT REQUIRE SPECIAL PULLEYS

BANDED V BELTS

POLY-V BELTS

POLY-V BELTS COMPACT DRIVE

Poly-V belt is highly flexible and hence can be used with smaller pulley diameter – lighter and compact drive.

HIGHER POWER

Higher power rating per unit width compared to conventional V-belt - 40% higher

ZERO SLIPPAGE

Eliminates the slippage due to maximum wedge contact on the pulleys.

REAR SIDE CAN ALSO DRIVE Being thinner the rear side can be used to drive additional accessories / idlers without affecting life. HIGHER BEARING LIFE Lesser static tension gives higher bearing life.

SILENT DRIVE Gives vibration and noise free power transmission in every application.

SINGLE BELT

Eliminates the necessity to use multiple / matched set

belts.

HIGHER SPEED

Can be used at higher speed more than 40 m/sec. LONGER LIFE Gives less wear and longer life to the pulleys due to less static tension and belt slippage.

LOW DOWNTIME & REPLACEMENT COST Reduces down time and also belt replacement cost.

POLY-V BELTS

DO’S & DONT’S OF V-BELTS

Drive DesigningWhen assessing the power requirements of the drive, do not forget to apply the appropriate service factor for the combination of prime mover and driven machine.Consider not only the running characteristics of the machines(I.e. smooth, heavy shock, pulsating), but also any abnormal loads applied during starting by high torque motors, or the inertia of the driven machine.Pulley Diameter SelectionPulley diameters should be proportionate to the other components in the drive. Minimum diameter pulleys cause an unnecessary flexing of the belts and may lead to premature bearing failure on the machines. Large pulleys have obvious space and cost disadvantages.Minimum Recommended Pulley DiametersGiven below are the minimum recommended pulley diameters for various sections of the belts for improved flex life.

A B C D E SPZ SPA SPB SPC

80 125 200 315 500 67 90 160 224

DO’S & DONT’S OF V-BELTSBelt Guards

Drives should not be completely enclosed by guards. Open mesh guards which allow normal air circulation but prevent any accidental contact with the drive are recommended.

Belt Storage

Belts should not be subjected to extremes of heat and cold. Standard belts can tolerate a considerable range of temperatures between –18 Deg C & +60 Deg C without damage. Drives designed outside this range will require special belts. Certain belts have a flame-resisting ability and will self-extinguish quickly in the case of fire. These belts should be used wherever there is danger of explosion.

Alignment of pulleys and belts

Check sheave alignment. Misalignment of sheave will shorten the belt life. Keep deflection angle less then 1/3 degree

DO’S & DONT’S OF V-BELTSPulley grooves

Uneven sheave grooves mismatched belts.

Check grooves for wear. More than 1/32”(0.794 mm) of dished out may lead to shorten belt life.

Installation of V-belts

Slack off on take-up until belts can be places in grooves without forcing. Never pry the belts into the sheave grooves to prevent cords break. Give proper tension on V-belts.

Check bearings or oil

Driving Pulley

Driven Pulley

SLACK SIDE

TIGHT SIDE

T2e T2e

T1e T1e

TENSIOING OF BELT DRIVES

Belt Tension Indicator

10 20 30 40 50 60 14 12 10 8 6 4 2 mm kg

Deflection in mm Deflection Force in kg

Belt Tension Indicator

16mm deflection per metre of span

applied to mid-span

As the high performance of V-Belts requires correct tension, we recommend using the Belt Tension Indicator.

Method of Belt Tensioning

1. Measure the span length

2. Multiply the span length in metres by 16 to obtain the deflection distance in mm.

3. Set the lower marker ring at the deflection distance required in mm on the lower scale.

4. Set the upper marker ring against the bottom edge of the top tube.

5. Place the belt tension indicator on top of the belt at the centre of

span, and apply a force at right angles to the belt deflecting it to the point where the lower marker ring is level with top of the adjacent belt.

6. Read off the force value indicated by the top edge of the upper marker ring.

7. Compare this force to the value shown in the table below.

Belt Section

SPZ SPA SPB SPC Z A B C

Small Pulley Dia (mm)

56 to95

100 to140

90to132

140to220

140to224

236to315

224to355

375to560

56to100

80to140

125to200

200to400

Newton (N)

10to15

15to20

20to27

28to35

35to50

50to65

60to90

90to120

5to7.5

10to15

20to30

40to60

Kilogram - force (kgf)

1.0to1.5

1.5to2.0

2.0to2.7

2.8to3.5

3.5to5.1

5.1to6.6

6.1to9.2

9.2to12.2

0.5to0.8

1.0to1.5

2.0to3.1

4.1to6.1

If the measured force falls within the values given, the drive will be satisfactory. A measured force below the lower value indicates under- tensioning.

A new drive should be tensioned to the higher value to allow for the normal drop in tension during the running-in period.

After the drive has been running for a few hours the tension should be checked and re-adjusted to higher the value.

EFFECT OF UNDER-BELTING

IN A 5 BELT DRIVE

NO. OF BELTS % UNDER LIFE

BELTING EXPECTANCY

5 NIL 100%

4 20% 45%

3 40% 17%

CAUSES OF V-BELTS FAILURE AND REMEDIES






V-BELTS PULLEY’S TYPE

DIMENSIONS OF STANDARD V-GROOVED PULLEY

The maximum distance 'L' between the outside edges of the pulley, i.e. the face width is equal to (x-1) e + 2f (where x is the number grooves)

CROSSSECTION

GROOVPITCHWIDTH

(Wp)

MINIMUMDISTANCE

FROMOUTSIDE

DIAMETERTO PITCHDIAMETER

(b) mm

MINIMUMGROOVEDEPTHBELOWPITCH

DIAMETER(h) mm

CENTER TOCENTER OF

GROOVE (e) mm

EDGE IFPULLEY TO

1ST

GROOVECENTER (f) mm

PITCHDIAMETER

(dp)mm

GROOVEANGLE (ө)

MINIMUMTOP

WIDTHOF

GROOVE(g) mm

Z,SPZ 8.5 2 9 12 ± 0.3 8.0 ± 1.0 UPTO 80 34 ± 0.25 9.7

ZX,SPZX OVER 80 38 ± 0.25 9.9

A, SPA 11 2.75 11 15 ± 0.3 10 + 2.0 UPTO 118 34 ± 0.25 12.7

AX, SPAX -1.0 OVER 118 38 ± 0.25 12.9

B,SPB 14 3.5 14 19 ± 0.4 12.5 + 2.0 UPTO 190 34 ± 0.25 16.1

BX,SPBX -1.0 OVER 190 38 ± 0.25 16.4

C,SPC 19 4.8 19 25.5 ± 0.5 17 + 2.0 UPTO 315 34 ± 0.25 21.9

CX,SPCX -1.0 OVER 315 38 ± 0.25 22.3

D 27 8.1 19.9 37 ± 0.6 24 + 3.0 UPTO 475 36 ± 0.25 32.3

-1.0 OVER 475 38 ± 0.25 32.6

E 32 9.6 23.4 44.5 ± 0.7 29 + 4.0 UPTO 610 36 ± 0.25 38.8

-1.0 OVER 610 38 ± 0.25 39.3

3V,3VX 8.9 0.64 8 10.3 ± 0.4 8.7 + 2.0 UPTO 88 36 ± 0.25 10.7

-0.8 88 TO 152 38 ± 0.25 10.8

152 TO 305 40 ± 0.25 10.9

ABOVE 305 42 ± 0.25 11.0

5V,5VX 15.24 1.27 13.7 17.5 ± 0.4 12.7 + 3.0 UPTO 254 38 ± 0.25 18.0

-1.0 254 TO 406 40 ± 0.25 18.18

ABOVE 406 42 ± 0.25 18.36

8V,8VX 25.4 2.54 22.6 28.6 ± 0.4 19 + 6.0 UPTO 406 38 ± 0.25 29.97

-1.5 406 TO 569 40 ± 0.25 30.25

ABOVE 569 42 ± 0.25 30.50

NOTE :

1) See figure for symbol.

2) The tolerance on dimension apply to the distance between the centre of any two grooves whether adjacent or not.

3) It is recommended that the tolerance on dimension should be taken into account in the alignment of the pulleys. 4) When the pulleys are to be used for V-Belts Z, A, B, C only, dimension 'h' may be reduced by 20 %.

5) Only above dimension pulleys should be used for Banded belts except for 'A' section, where e = 15.9 mm. The tolerance for side wobble and for run out (eccentricity), in mm per millimeter of pulley diameter shall be as follows :

Pulley diameter < 500 mm ± 0.001 mm 500 mm < Pulley diameter < 1500 mm ± 0.0015 mm

Pulley diameter > 1500 mm ± 0.002 mm

Standard range of metric pulleys

Dual duty grooves to perfectly match Classical ‘V’ & Space Saver Wedge Belts

Conform to IS 3142 groove specifications

Speed ratios up to 1:7

Standard MOC Cast Iron Grade 20 IS:210

Pulleys with other grades of Cast Iron and Cast steel

are also offered on request

TAPER LOCK BUSHES

Easy & quick ‘shrink fit’ on the shafts by using only Allen-key.

Available with finished bore & keyway in both metric & imperial sizes.

Interchangeable between many products such as Pulleys, Couplings, Sprockets etc.

Accommodates shaft tolerances + 0.051mm(0.002”) to - 0.127mm(0.005”).

TAPER LOCK BUSHES - FIXING

=> Each component has three similarly located half holes parallel to the axis.=>In the hub two these are full length tapped and corresponding hole in the taper lock bush is not tapped or part way through.=> When tightened in the two threaded holes in the hub the screws touches bottom in the plain hole of the bush and forcing it into the taper.=>To release the taper grip and withdraw the bush from the hub, two screws are removed and one of them is tightened into the threaded hole of the bush.

Types of coupling misalignment.

STANDARD

COUPLING

STANDARD SPACER

COUPLING

EXTERNAL SPIDER

COUPLING

EXTERNAL SPIDER

SPACER COUPLING

ESSEX FLEXIBLE JAW COUPLING

CUSHION COUPLING CUSHION SPACER

COUPLING


Absorbs shocks & damps small amplitude

vibrations.

Caters incidental angular, parallel & axial misalignment

Lubrication not required Nitrile Rubber elastomeric inserts to withstand temperatures from - 40 Deg to +100 Deg C

Spacer coupling with spacer size depending upon the DBSE

MOC CI Grade 20 IS:210


Thank you

Engineering

Presentation v belt drives