Refers to a universal joint that transmits motion at an equal instantaneous angular velocity under a design angle, and transmits motion at an approximately equal instantaneous angular velocity under other angles. It is divided into:
a) Double quasi-constant velocity universal joint. Refers to the universal joint when the length of the transmission shaft in the universal joint constant velocity transmission device is shortened to the minimum.
b) Bump type quasi-constant velocity universal joint. It is composed of two universal joints and two bumps of different shapes. The two protrusions are equivalent to the intermediate transmission shaft and two cross pins in the double universal joint device.
c) Three-pin shaft type quasi-constant velocity universal joint. It consists of two three-pin shafts, active eccentric shaft fork and driven eccentric shaft fork.
d) Spherical roller type quasi constant velocity universal joint. It is composed of a pin shaft, a spherical roller, a universal joint shaft and a cylinder. The roller can move axially in the groove to play the role of telescopic spline. The roller contact with the groove wall can transmit torque.