Working principle of constant angular velocity universal joint

In some occasions, it is impossible to arrange two cross-shaft universal joints and one drive shaft, which requires a universal joint that can achieve constant angular velocity transmission separately.The working principles of universal joints that can achieve constant angular velocity transmission are basically divided into the following two types:

(1) Two cross-shaft universal joints and a drive shaft with constant angular velocity transmission principle

The transmission shaft in this constant angular speed transmission mechanism is reduced to the shortest length, and the double-linked (and three-pin type, bump type) constant angular velocity universal joint belongs to this kind.

(2) Principle of bevel gear transmission

Two identical bevel gears mesh with each other for transmission (see Figure-1), and the speed of the driven gear and the driving gear must be the same.Such a transmission mechanism can also be described in principle: When the force transmission point between the driving shaft and the driven shaft of the universal joint is always on the bisector of the angle between the axis of the driving shaft and the axis of the driven shaft (or the distance between the power transmission point and the two axes) When the distances are equal), constant angular speed transmission is bound to be realized.

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