An example is the clutch found in most automobiles.
Flat-plate friction clutches
Torsional springsSplined boss (hub)Friction liningClutch plate
or friction plate
Pressure plateDiaphragm springClutch housingPressure plate and
housing
In a multi plate clutch, the torque is transmitted by friction
between several pairs of co-axial annular driving faces maintained
in contact by an axial thrust.Both sides of each plate are lined
with friction material, so that a single-plate clutch has two pairs
of driving faces in contact.Multi plate clutches
n = no. of pairs of driving faces.Then, for a plate clutch, the
maximum torque transmitted isMulti plate clutches
No. of driving pairs n = 6 Multi plate clutch
Exercise Problems
Problem 15A car engine has its rated output of 12 kW. The
maximum torque developed is 100 N-m. The clutchused is of single
plate type having two active surfaces. The axial pressure is not to
exceed 85 kN/m2. The external diameter of the friction plate is
1.25 times the internal diameter. Determine the dimensionsof the
friction plate and the axial force exerted by the springs.
Coefficient of friction = 0.3
[Ans. 129.5 mm ; 103.6 mm ; 1433 N]
Problem 16
A single plate clutch (both sides effective) is required to
transmit 26.5 kW at 1600 r.p.m. The outer diameter of the plate is
limited to 300 mm and intensity of pressure between the plates is
not to exceed 68.5 kN/m2. Assuming uniform wear and a coefficient
of friction 0.3, show that the inner diameter of the plates is
approximately 90 mm.
Problem 17
A multi plate clutch has three pairs of contact surfaces. The
outer and inner radii of the contact surfaces are 100 mm and 50 mm
respectively. The maximum axial spring force is limited to 1 kN. If
the coefficient of friction is 0.35 and assuming uniform wear, find
the power transmitted by the clutch at1500 r.p.m.
[Ans. 12.37 kW]
Problems
A multi-plate clutch is to transmit 12kW at 1500rev/min. The
inner and outer radii for the plates are to be 50mm and 100mm
respectively. The maximum axial spring force is restricted to 1kN.
Calculate the necessary number of pairs of surfaces if =0.35
assuming constant wear. What will be the necessary axial force?
(Answer, 3; 970N)
Driving shaftDriven shaftFriction liningThe maximum torque
transmitted = = semi-apex angle of the coneOnly one pair of driving
surfaces is possible, n =1Cone clutchT = Wrm cosecw
![A new kind of resin-based wet friction material: Non-woven ... · 1 Introduction. Friction materials are widely used in automatic transmissions and clutches in automobiles [1–3]](https://img.dokumen.tips/doc/110x75/610ff52e2ab81b75d2765cc6/a-new-kind-of-resin-based-wet-friction-material-non-woven-1-introduction-friction.jpg)
