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TM 9-8000
Figure 28-5. Rzeppa Constant Velocity Joint
joint housing that positions the balls.  The manner in
the pencil was  limited  to  rolling  in  a  direction
which this action is accomplished can be illustrated by
perpendicular to the long axis of the pencil, whereas the
placing a ruler across a round pencil on a table; if the
balls may move in any direction. When both shafts of
ruler is moved to cause the pencil to roll without slipping,
the constant-velocity joint are in line, that Is, at an angle
the pencil travel is exactly half that of the ruler. In this
of 180 degrees, the balls lie in a plane that is at 90
example there are three objects: the table top, the pencil,
degrees to the shafts. If it is assumed that the driving
and the ruler; two of which are movable members, and
shaft remains in the original position, any movement of
the third stationary. The inner race can be considered as
the driven shaft out of this line will cause the balls to
the stationary table top, the ball as the pencil, and the
move one-half the angular distance. Therefore, if the
driven race as the ruler.  The same relative motion
driven shaft moves through an angle of 20 degrees, the
between the pencil and the ruler occurs between the
angle between the shafts will be reduced to 160 degrees,
outer (driven) race and the balls in the constant-velocity
the balls will move 10 degrees in the same direction, and
joint because the balls fit tight enough in the coupling to
the angle between the driving shaft
prevent slippage. The only difference is that motion of


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