623 Constant velocity joints

Constant velocity joints imply that when two shafts are inclined at some angle to one another and they are coupled together by some sort of joint, then a uniform input speed transmitted to the output shaft produces the same angular output speed throughout one revolution. There will be no angular acceleration and deceleration as the shafts rotate.


1 When y = R the angular instantaneous velocities will be equal.

2 When y is smaller than R, the output instantaneous velocity will be less than the output.

3 When y is larger than R, the output instantaneous velocity will be greater than the input.

Example 1 A Hooke's universal joint connects two shafts which are inclined at 30° to each other. If the driving shaft speed is 500 rev/min, determine the maximum and minimum speeds of the driven shaft.

Minimum speed No = Ni cos 30

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