Angle Spring a clutch design where the clutch application springs are mounted at an angle so as to reduce the tendency for spring pressure to increase when the pedal is depressed and decrease when the pedal is released. Such a shaft would have non-parallel, but compensating angles. This causes the rear joint to slow by the same amount of speed that the forward joint speeds up, resulting in joint cancellation with both the driving and driven shafts turning at a constant and identical speed. Center Bearing a driveshaft part. Driveshafts have a critical operating speed beyond which vibration will become destructive.
Critical speed becomes lower as driveshaft length is reduced.
On some trucks, a shaft is long enough to run near its critical speed in achieving the roadspeed required in the application. In these cases, the shaft will be divided into two sections and a center bearing will be used to support it at the junction of the two sections. In this way, critical speed can be tuned out of the system while the total length of the shaft and spacing of components is maintained. Ceramic Clutch Lining a lining that provides especially long service life, although it does not engage as smoothly as its counterpart the organic lining and may sometimes cause drivers to complain that it is grabby. Ceramic linings typically take the form of four isolated, riveted semi-circular areas on either side of the clutch disc in order to limit total surface and grabbiness while maximizing cooling.