Clutch(single and multi plate)
Transcript of Clutch(single and multi plate)
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MULTIPLATE CLUTCH
By:Nirav
patel 10ME027
MACHINE DESIGN 1
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What is clutch?
A Clutch is a machine member used to connect the driving shaft to a driven shaft, so that the driven shaft may be started or stopped at will, without stopping the driving shaft.
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Function Of ClutchClutch is used to transmit power from
driven shaft to driving shaft.In automobiles, where vehicle can be
stopped for a while or to change the gear, the requirement is that the driven shaft should stop but the engine should run naturally under the no load condition.
This is achieved by using clutch mounted between engine shaft and gearbox shaft and which is operated by a lever.
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Types Of Clutch
Types of Clutches
Positive Clutch Friction Clutch
Plate Or Disc
Clutch
Single plate clutch
Multiplate Clutch
Cone Clutch
Centrifugal Clutch
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Single Plate clutch
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2R
1R
rδ1R
2R
Design of clutch plate
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Single Plate ClutchW=total axial load
R1=External radius of clutch plate
R2=internal radius of the clutch plate
P=intensity of pressure between contacting surfaces.
µ=coefficient of friction between contacting surfaces
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Single Plate ClutchConsider a elemental ring of
radius ‘r’ and thickness δr on the contacting surface.
therefore,Area of the ring on contacting
surface is,
Axial load on the ring is, δW=pressure×Area of the ring
δrr 2πδA
δrr 2πpδW
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Single Plate ClutchFrictional resistance offered by ring is,
Frictional torque acting on the ring is,
……(1)
δWμ Fr
δrr pμ 2πδr)r 2π μ(pFr
r 2
r
rr
δr pμ 2πδr.rr pμ 2πT
r FT
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Single Plate ClutchTorque transmitted by single
plate clutch is obtained by considering following two assumptions
(a)uniform pressure theory (b)uniform wear theory
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Single Plate Clutch(a)uniform pressure theory: Assuming that the intensity of pressure over
the entire contacting surface area is constant,
Then, p=constant
….(2)
Total torque transmitted by single plate clutch can be obtain by integrating Equation
22
21 RRπ
W
area surface contacting
loadp
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Single Plate Clutch(1)within limit R2 to R1 we
[∵p=Constant]
1
2
R
R
2T
0
r δr r pμ 2πΤ
1
2
R
R
2T
0
r δr rpμ 2πΤ
32
31
R
R
3
RR pμ π3
2
3
rpμ 2πΤ
2
1
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…….(A)
Equation (A) gives the torque transmitted by
single plate clutch due to friction considering uniform pressure theory.
32
312
22
1
RRRRπ
Wμ π
3
2Τ
2
22
1 RRπ
Wp∵
22
21
32
31
RR
RRμ W
3
2Τ
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Single Plate Clutch(b) Uniform Wear TheoryIn this theory, we are considering that
wear which take place is uniform over the entire contacting surface i.e.
P.r=constant
P.r=C
P=C/r …...(3)
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Single Plate ClutchAxial load acting on the ring is δW=p 2π r δr
δW=2 π C δr
…(4)Integrating above Equation(4)
within limit we get,
δr C 2π r
CδW
w
0
R
R
1
2
δr C 2πδW
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Single Plate Clutch
……….(5) We know that frictional torque acting on ring
is,
…….(6)
21
21RR
RR 2π
WC
RR C 2r C 2πW 1
2
δr r Cμ 2πΤδrrr
Cμ π2Τ
δr r pμ 2πΤ
r 2
r
2r
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Single Plate ClutchTorque transmitted by single
plate clutch can be obtain by integrating the Equation (4 ) within the limit R2 to R1 we get,
2
RRCμ 2π
2
rCμ 2πΤ
δrr Cμ 2πΤ
δrr Cμ 2πΤ
22
21
R
R
2
R
R
T
0
r
R
R
T
0
r
1
2
2
2
2
2
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Single Plate Clutch
This is the torque transmitted by single plate due to friction considering uniform wear theory.
μW π2
1Τ
RR
RRμW π
2
1Τ
RRRR2π
Wμ πΤ
21
22
21
22
21
21
21R R
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Single Plate Clutch Power transmitted by single plate
clutch is given by,
rpmin shaft of SpeedN where,
Watt60
NΤ 2πP
Τ ωP
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Multiplate ClutchMultiplate clutch is used when large torque is to be transmitted e.g. motor cars and machine tools
Multiplate clutch is used when compact construction is required e.g. scooters and motor cycles.
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For multiplate clutchFor uniform pressure theory,
For uniform wear theory,
22
21
32
31
RR
RRμ W
3
2nΤ
21 RRμW 2
1nΤ
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Multiplate Clutch Notes: In case of new clutch ,the intensity of
pressure is uniform along the surface of clutch but in case of old clutch uniform theory is more correct.
For single plate clutch normally both sides of the plate are effective .there for single plate clutch has two pairs of contacting surface i.e. n=2.
In actual practice, usually the theory of uniform wear is used in analysis of clutch.
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Intensity of pressure is maximum at the inner radius R2 of the friction or contact surface,
Intensity of pressure is minimum at the inner radius R1 of the friction or contact surface,
2max2max R
CP OR CRP
1max1max R
CP OR CRP
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In mutilate disc clutch no of disc on driving shaft no of disc on driven shaft
So no. of pairs in contact,
2n1n
1nnn 21
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Multiplate clutch
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Clutch plate
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THANK YOU….