Roughly 12 degree of anglular movement
When checking the flank check the spine, cuz the shaft is like a sound magnifier
Binding, shaft will lift the transmission.
CV Constant Velocity can give 100% of the drive whereever the angle. allow to extend or retract the shaft
Other types of joints
Layrub Coupling is similar to a CV Constant Velocity, it can deliver 100% of the torque applied at various angle. Whereas a cross joint varying velocity with angles, the more angle the less velocity. Also it allows the shaft to be lengthen and shorten. That means when the suspension goes up and down, the driveshaft is in correct motion.
Rubber trunnion joint
Absorb vibration due to the made of rubber, only works on limited angles, use for low power vehicle.
The doughnut joint
Normally larger in diameter 150mm- 250mm. Everything applied same as the rubber trunnion, still small angle, absorb vibration, but can operate @ greater horse power.
Universal joint yoke phasing
To obtain the variable velocity characteristic within the driveshaft, it is critical that the yokes on each end of the driveshaft "in phase" i.e both yokes are in line, and turn through the same angular distance together.
Most car driveshafts eliminate any possibility of being out of phase by having the sliding spline or "slip joint" on the input yoke to the driveshaft
When you get 2 univerasal joint, the angle problem is elminated becasue the ang;e is lessened.
Major causes of drive shaft vibration:
Out of phase driveshaft yokes, out of balance(will cause the bush behind the shaft to wear out),=> twisted driveshaft
Shaft run-out, bent
How to get rid of the noise: vibration=freq=wave=sound=harmonic of the car.
CV joint lubricant
most molybdenum disulphide greases from reputable oil suppliers are suitable eg castrol ms3 grease; however however some vehicle manufacturers specify a particular product for their equipment and these recommendations must be followed.
Worn universal joint.
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