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A clutch enables two co-axial shafts to be engaged or disengaged while at rest or in relative motion. PowerPoint Presentation
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A clutch enables two co-axial shafts to be engaged or disengaged while at rest or in relative motion. - PowerPoint PPT Presentation


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Friction Clutches. A clutch enables two co-axial shafts to be engaged or disengaged while at rest or in relative motion. Types of Friction Clutches. Disc or plate clutches Cone clutches Centrifugal clutches. Driven shaft. Flat-plate friction clutches. Friction plate. springs. W.

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slide1

Friction Clutches

A clutch enables two co-axial shafts to be engaged or disengaged while at rest or in relative motion.

types of friction clutches

Types of Friction Clutches

Disc or plate clutches

Cone clutches

Centrifugal clutches

slide4

Driven shaft

Flat-plate friction clutches

Friction plate

springs

W

W(axial thrust)

T

Driving shaft

T

Friction lining

Pressure plates

Single-plate Friction Clutch (Disengaged position)

slide5

Friction plate

springs

W

W(axial thrust)

T

Driving shaft

T

Driven shaft

Pressure plates

Friction lining

Flat-plate friction clutches

Single-plate Friction Clutch (Engaged position)

slide6

Flat-plate friction clutches

An example is the clutch found in most automobiles.

slide9

Clutch plate or friction plate

Torsional springs

Friction lining

Splined boss (hub)

slide10

Pressure plate and housing

Clutch housing

Diaphragm spring

Pressure plate

slide12

Multi plate clutches

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.

slide13

Multi plate clutches

n = no. of pairs of driving faces.

Then, for a plate clutch, the maximum torque transmitted is

slide14

Pressure plates

1

3

2

6

4

5

driven

driver

Friction plates

Multi plate clutch

No. of driving

pairs n = 6

slide16

Problem 15

A car engine has its rated output of 12 kW. The maximum torque developed is 100 N-m. The clutch

used 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 dimensions

of 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]

slide17

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.

slide18

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]

slide19

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)

slide20

Cone clutch

α = semi-apex angle of the cone

Only one pair of driving surfaces is possible,n =1

α

w

Driven shaft

Driving shaft

Friction lining

T = μWrmcosecα

The maximum torque transmitted =

slide24

F=mrω2

Centrifugal clutch

Driven shaft

ω

ω

Driving shaft

Friction lining

Total friction torque , T = nµR(F-P)

P

R