Common quasi-constant velocity universal joints have tw […]
Common quasi-constant velocity universal joints have two types, double-joint type and three-pin shaft type. Their working principle is the same as that of double cross-shaft universal joints to realize constant velocity transmission.
The double universal joint is actually a set of double cross-bearing universal joint constant velocity transmission device that reduces the length of the transmission shaft to the minimum. The double fork is equivalent to the universal joint with the transmission shaft and both ends on the same plane. To the knot fork.
When the angle of intersection between the output shaft and the input shaft is small, the angular velocities of the two shafts can be made close to the same. The intersection of the two shaft axes on the arc is very close to the above-mentioned mid-vertical line, making the α spherical roller bearing 1 and The difference of α2 is very small, so the double universal joint is called the quasi-constant velocity universal joint.
1. Three-pin shaft universal joint bearing
Advantages: Allows a larger angle of intersection between two adjacent axes, up to 45°. , In the steering drive axle, the vehicle model query vehicle can obtain a smaller turning radius and improve vehicle mobility. Disadvantages: takes up a lot of space. It evolved from the double universal joint.
2. Double universal joint
Advantages: Allows a large angle between the shafts, reliable work, simple structure, convenient manufacturing, and the maximum angle of intersection can reach 50&. The double universal joint is used for the steering drive axle, but the double universal joint must be guaranteed in the structure The center is located at the intersection of the axis of the king pin and the axis of the semi-shaft, and there can be no indexing mechanism to ensure constant speed transmission.
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