Fly Wheels, Clutch Plates and Friction
In a Car's clutch,
a flywheel connects to the engine, and a clutch
plate connects to the transmission. You can see what this looks like
in the video clip below.
When your foot is off the pedal, the
springs push the pressure plate against the clutch disc, which in turn presses
against the flywheel. This locks the engine to the transmission input shaft,
causing them to spin at the same speed.
The amount of force the clutch can hold depends on the
friction between the clutch plate and the flywheel, and how much force the
spring puts on the pressure plate. The friction force in the clutch works just
like the blocks described in the friction section of How Brakes Works, except that the spring presses on the clutch plate instead of
weight pressing the block into the ground.
How a clutch engages and
When the clutch pedal is pressed, a
cable or hydraulic piston pushes on the release fork, which presses the
throw-out bearing against the middle of the diaphragm spring. As the middle of
the diaphragm spring is pushed in, a series of pins near the outside of the
spring causes the spring to pull the pressure plate away from the clutch disc. This releases the clutch from the spinning engine.
Clutch plate
Note the springs in the clutch plate. These springs help to
isolate the transmission from the shock of the clutch engaging.
This design usually works pretty well, but it does have a
few drawbacks. We'll look at common clutch problems and other uses for clutches
in the following sections.
Clutch Plate Springs
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