63 Tiger Cub - Clutch

63 Tiger Cub - Clutch

63 Tiger Cub - ClutchWill, Adam, Robert, and Jack

What is a clutch?A clutch is a device used in machines to transmit power from the engine to the transmissionIt 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 gearWithout a clutch the transmission would wear down over timeWithout 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 PlateBacking plate, rebound rubber, drive rubber, spider, lock washer, centre, centre driving cup, backing plate pin, sprocket bearing ball, sprocket bearing ring

6Sprocket and HousingDouble sprockets

Driven PlatesSteelLugs on insideEngage with the engine

Driving PlatesPads = corkLugs on outsideEngage with the transmission

Pressure PlatePresses plates together to engage clutchPushed up by clutch operating rod to disengage clutch and allow rider to shift

Adjuster locknut, pressure plate adjuster 10Spring Cups

Pressure SpringsPress on pressure plate to engage clutch

Pressure Spring Nuts

Sprocket and Primary ChainWhy 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 WorksWhen the clutch is engaged, the driven and driving plates are pressed together by the pressure plate and springs and spin at the same speedWhen 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 slippageThe greater the friction, the greater the torque that the clutch can handle without slippingHow much force is applied by the springs?Gear ratio: 19/48Length of spring: 1.53 in. = .1275 ft.Length of spring after 20 lbs. applied = 1.324 in. = .1103 ft. # of surfaces touching = 7Coefficient 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 springsIf we assume a certain amount of compression in the spring, we can find any torque