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Title02 Clutches
Tags Mechanical Engineering Friction Speed Clutch
File Size697.3 KB
Total Pages31
Document Text Contents
Page 30

Example 4: Centrifugal clutch

 A centrifugal clutch is to transmit 15 kW at 900 rpm.
The shoes are four in number. The speed at which

the engagement begins is 3/4 th of the running

speed. The inside radius of the pulley rim is 150 mm
and the centre of gravity of the shoe lies at 120 mm
from the centre of the spider. The shoes are lined
with Ferrodo for which the coefficient of friction may

be taken as 0.25. Determine: 1. Mass of the shoes,
2. Size of the shoes, if the angle subtended by the
shoes at the centre of the spider is 60° and the
pressure exerted on the shoe is 0.1 N/mm2.

Page 31

Example 4: Centrifugal clutch

P = 15 kW = 15 x 103 W
N = 900 rpm, ω = 2π (900)/60 = 94.26 rad/s
n = 4
R = 150 mm = 0.15 m
r = 120 mm = 0.12 m
 μ = 0.25

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