If viewed from the side, the balls within the joint always
bisect the angle formed by the shafts on either side
of the joint regardless of the operating angle. This reduces
the effective operating angle of the joint by half and virtually eliminates all vibration problems. The input speed
to the joint is always equal to the output velocity of the joint-thus the description "constant velocity." the cage
helps to maintain this alignment by holding the six ball snugly in its windows. If the cage windows become worn
or deformed over time, the resulting play between ball and window typically results in a clicking noise when turning. It is important to note that opposing ball in a Rzeppa CV joint always work together as a pair. Heavy wear in the tracks of one ball almost always results in identical wear in the tracks of the opposing ball.
Another ball-type joint is the dish-style CV joint , which is used predominantly on Volkswagen as well as
on many German RWD models. Its design is very similar to-the Rzeppa joint.