What role does the universal joint play?

The universal joint refers to a mechanical structure that utilizes a ball joint to achieve power transmission of different shafts. The universal joint is a very important part of the car. The universal joint is combined with the drive shaft and is called a universal joint transmission. In front-engine rear-wheel drive vehicles, the universal joint transmission is installed between the transmission output shaft and the transaxle final drive input shaft; while the front engine front-wheel drive vehicle omits the drive shaft, universal joint installation Between the axle axle and the wheel, both the drive and the steering. In a universal joint fit, the rotation of one component (output shaft) about its own axis is driven by the rotation of another component (input shaft) about its axis. The universal joint, that is, the universal joint, is a mechanism for realizing variable-angle power transmission for the position where the direction of the transmission axis needs to be changed. It is the "joint" component of the universal transmission of the automobile drive system. The universal joint is combined with the drive shaft and is called a universal joint transmission.

The structure and function of the universal joint is somewhat like the joint on the limbs of the human body, which allows the angle between the connected parts to vary within a certain range. In order to meet the angular changes caused by the power transmission, the steering and the up and down jump caused by the running of the car, the drive axle of the front drive car is connected with the universal joint between the axle and the axle. However, due to the limitation of the axial dimension, the required declination is relatively large. A single universal joint cannot make the instantaneous angular velocity of the output shaft and the shaft into the shaft equal, which is easy to cause vibration, which aggravates the damage of the machine and generates a large noise. Therefore, a wide variety of constant velocity joints are widely used.

In the front drive car, each half shaft uses two constant velocity joints, the universal joint near the transaxle is the half shaft inner joint, and the axle near the axle is the outer half of the axle. In a rear-drive car, the engine, clutch and transmission are mounted as a unit on the frame, and the transaxle is connected to the frame via a flexible suspension with a distance between them that needs to be connected.

The unevenness of the road surface during the running of the vehicle, the load change or the difference between the installation of the two assemblies, etc., will change the angle and distance between the transmission output shaft and the input shaft of the transaxle final drive, so that the rear drive motor The universal joint transmission form uses double universal joints, that is, there is a universal joint at each end of the transmission shaft, which functions to make the angles of the two ends of the transmission shaft equal, and ensure that the instantaneous angular velocity of the output shaft and the shaft input shaft are always equal.
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