The drive shaft is an important part of the transmission of power in the car drivetrain. Its role is to transfer the power of the engine to the wheels together with the gearbox and drive axle, so that the car produces driving force.

Universal joint is the key part of automobile drive shaft. A car is a moving object. On the rear-drive car, the engine, clutch and transmission are mounted on the frame as a whole, while the drive axle is connected to the frame by an elastic suspension. There is a distance between the two that needs to be connected. The uneven road surface caused the car to jump.

Transmission shaft classification

According to the elastic points

Drive shaft according to its important component - universal joint of different, can have different classification. If there is obvious elasticity in the direction of torsion according to the universal joint, it can be divided into rigid universal joint drive shaft and flexible universal joint drive shaft.

1. Rigid universal joint: transfer power by hinge connection of parts.

2. Flexible universal joint: by elastic parts to transfer power, and has a buffer reduction.

By angular rate

The rigid universal joint can be divided into unequal velocity universal joint (such as cross shaft universal joint), quasi-constant velocity universal joint (such as double universal joint, three pin shaft universal joint) and constant velocity universal joint (such as ball cage universal joint, ball fork universal joint). Constant speed and unequal speed refer to whether the rotational angular rate of the driven axis is equal when the driven axis rotates with the driving axis. Of course, the average rotational speed of the driving axis and the driven axis is equal.

1. Constant velocity universal joint:

A universal joint where the angular velocity of the main and driven axes is equal even when the included Angle between the two axes changes is called a constant velocity universal joint or a constant angular velocity universal joint. They are mainly used for steering drive axle, breaking drive axle and other wheel transmission devices, mainly used for power transmission in cars.

2. Uneven universal joint:

The angular velocity of the main and driven axes is not equal when the Angle between the two axes changes, called the unequal velocity universal joint, also known as the cross shaft universal joint. Cross - shaft rigid universal joint drive shaft is widely used in automobile transmission system and has a long history.