review and summary

REVIEW AND SUMMARY

• At the beginning of this chapter, functions and principle of operation of the clutch are presented.

• The three important types of friction clutches i.e., disc or plate clutches, cone clutches and centrifugal clutches are also discussed.

• Single plate clutch:

(i) Torque transmitted on the single plate clutch is given by

T = μ • W • R

where μ = Coefficient of friction,

W = Axial thrust exerted by the springs,

R = Mean radius of friction surface.

r1 = External radius of friction surface, and

r2 = Internal radius of friction surface.

• Multiplate clutch:

(i) Torque transmitted on the multiple plate clutch is given by

T = n  • μ • W • R

where n = Number of pair of contact surfaces = n1 + n2 − 1,

n1 = Number of discs on the driving shaft, and 

n2 = Number of discs on the driven shaft.

(ii) Axial force to engage the clutch, W = 2πC (r1 −r2)

(iii) Average pressure on the friction surface is given by 

(iv) Total number of plates = Number of pairs of contact surface + 1

• Cone clutch:

(i) Torque transmitted on the cone clutch is given by

(ii) Axial force required at the engagement of clutch is given by

We = W (sin α + μ cos α)

and axial force required at the disengagement is given by

Wd = Wn (sin α - μ • cos a)