Clutches 18 April, 2011

Prof. Samy J. Ebeid ١

Ex 05-2 Pneumatic Clutch

١SJE Part 05A Clutches

A machine is driven by an electric motor through a V- belt drive and

a pneumatically operated multi-plate friction clutch.

Motor maximum power 15 KWMotor speed 1450 rpm

Motor pulley diameter 160 mm

Speed reduction 2 : 1

Number of clutch contact surface 6

Outer diameter of contact surface 250 mmInner diameter of contact surface 150 mm

Effective area of each contact surface 260 cm2

Coefficient of friction between the steel lubricated surfaces 0.04

Maximum permissible contact pressure 1 MPa

-Find the air pressure necessary to operate the clutch if only 40%

of the motor power is required to be transmitted to the machine.

-Find the size and number of the V-belts.

-Draw a free-hand sketch for the pulley-clutch unit.

٢SJE Part 05A Clutches

Ex 05-2

Clutches 18 April, 2011

Prof. Samy J. Ebeid ٢

Air Inlet Device

٣SJE Part 05A Clutches

Ex 05-2

٤SJE Part 05A Clutches

Ex 05-2Air Inlet Device

Clutches 18 April, 2011

Prof. Samy J. Ebeid ٣

٥SJE Part 05A Clutches

Electromagnetic Clutch

٦SJE Part 05A Clutches

Electromagnetic Clutch

Clutches 18 April, 2011

Prof. Samy J. Ebeid ٤

٧SJE Part 05A Clutches

The sketch shows the layout of an Electromagnetic Clutch.Power is transmitted from the pulley (driving member) tothe shaft (driven member) through the clutch elements.

The mean diameter of the friction surface could be in the range of 200

to 250 mm.

Design and present a fully detailed construction drawing for the pulley-

clutch unit.

Clutch power/speed 15 KW / 1450 RPM

Maximum force of attraction of the electromagnet 5000 N

Ex 05-3 Electromagnetic Clutch

٨SJE Part 05A Clutches

Ex 05-3