63 Tiger Cub - Clutch

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29 Νοε 2013 (πριν από 3 χρόνια και 8 μήνες)

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63 Tiger Cub
-

Clutch

Will, Adam, Robert, and Jack

What is a clutch?


A clutch is a device used in machines to
transmit power from the engine to the
transmission


It can be engaged to allow the engine and
transmission to spin at the same speed or
disengaged to allow them to spin at different
speeds (thus allowing the rider to shift gears)


Wet vs. dry clutch?


Why do we need a clutch?


The clutch allows for a smoother shift from
gear to gear


Without a clutch the transmission would wear
down over time


Without a clutch, the only way to stop the
wheels from spinning would be to turn off the
engine (because otherwise whenever the
engine spins the wheels would too)

Clutch Parts

Clutch Parts

Backing Plate








Backing

plate, rebound rubber, drive rubber, spider, lock
washer, centre, centre driving cup, backing plate pin, sprocket
bearing ball, sprocket bearing ring


Sprocket and Housing


Double sprockets

Driven Plates



Steel


Lugs on inside


Engage with the
engine

Driving Plates



Pads = cork


Lugs on outside


Engage with the
transmission

Pressure Plate


Presses plates together to engage clutch


Pushed up by clutch operating rod to
disengage clutch and allow rider to shift

Spring Cups

Pressure Springs


Press on pressure plate to engage clutch

Pressure Spring Nuts

Sprocket and Primary Chain



Why double chain?


Innovation


double chain is more
durable, single chain
caused the sprockets
to wear down/break

Clutch Lever

Clutch Cable

Clutch Operating Rod

How It Works


When the clutch is engaged, the driven and
driving plates are pressed together by the
pressure plate and springs and spin at the
same speed


When the clutch lever is pulled, the clutch
operating rod pushes up on the pressure
plate, disengaging the clutch and allowing the
engine and transmission to spin at different
speeds, thus allowing the rider to shift gears

Friction
-

Why multiple plates?


Having multiple plates increases the friction,
thus reducing the slippage


The greater the friction, the greater the
torque that the clutch can handle without
slipping

How much force is applied by the
springs?


Gear ratio: 19/48


Length of spring: 1.53 in. = .1275 ft.


Length of spring after 20 lbs. applied = 1.324
in. = .1103 ft.


# of surfaces touching = 7


Coefficient of friction = 0.8 (cork on steel)


Diameter of clutch = 5.33 in. = .444 ft.


Clutch slips @ 50
ft.lbs
.


How much force is applied by the
springs?


F =
kx

(spring)


F =
uN

(friction)


T =
rF

(torque)


Given a torque, we found compression in the
springs


If we assume a certain amount of compression
in the spring, we can find any
torque