First, according to the elastic points

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

1. Rigid universal joint: the power is transferred by the hinged connection of the parts.

2. Flexible universal joint: transfer power by elastic parts, and with buffering and damping.

Second, according to the angular rate

Rigid universal joints can be divided into non-uniform velocity universal joints (such as cross shaft type universal joints), quasi-uniform velocity universal joints (such as double type universal joints, three pin type universal joints) and uniform velocity universal joints (such as ball cage type universal joints, ball fork type universal joints). Constant speed and not constant speed, refers to the driven shaft with the drive shaft rotation, the rotation angular rate of the two is equal, of course, the average speed of the drive shaft and the driven shaft is equal.

1. Constant velocity universal joint:

A universal joint in which the angular velocity of the main and driven shafts remains the same even when the included Angle between the two shafts changes is called a constant velocity universal joint or an equal angular velocity universal joint. They are mainly used in steering drive axles, broken drive axles and other wheel transmission devices, mainly used for power transmission in cars.

2. Unconstant speed universal joint:

A universal joint whose angular velocity of the main and driven shafts is not equal when the included Angle between the two shafts changes is called a non-uniform universal joint, also known as a cross shaft type universal joint.

The cross shaft type rigid universal joint drive shaft is widely used in automobile transmission system and has a long history. When the car for the rear wheel drive, often use the cross shaft type universal joint drive shaft, for some high-end cars, there are also the use of constant speed ball head; When the car is front-wheel drive, it is often used constant speed universal joint - constant speed universal joint is also a transmission shaft, but the title is different. Usually referred to as the transmission shaft generally refers to the cross shaft type rigid universal joint transmission shaft. The cross shaft type rigid universal joint is mainly used for the change of transmission Angle. It is generally composed of a flanged fork, a cross shaft with needle roller bearing assembly, a universal joint fork or a sliding fork, a middle connecting fork or a spline shaft fork, and an axial fixing part of a needle roller bearing.

The flanged fork is a flanged fork-shaped part. It is generally used in forging parts of medium carbon steel or medium carbon alloy steel, as well as in sand casting parts of nodular cast iron and precision casting parts of medium carbon steel or medium carbon quality alloy steel. The flange fork generally has a flat flange, and there are also flanges with a face trapezoidal teeth. Cross shaft needle roller bearing assembly generally consists of four needle roller bearings, a cross shaft, a grease nozzle. Needle roller bearings generally consist of several needle rollers, a bearing bowl, a multi-edge rubber oil seal (part with skeleton). In some needle roller bearings, there is a circular gasket with oil groove, nylon, copper or other materials, mainly used to reduce the axial clearance of the universal joint, improve the quality of the dynamic balance of the transmission shaft. The universal joint fork is a fork-shaped part, which is generally forged by medium carbon steel or medium carbon alloy steel, and also precision cast by medium carbon steel. The axial fixing parts of needle roller bearings are generally elastic retaining rings (inside and outside clamp) for holes (or shaves), or bearing press plates, lock plates, bolts, etc.

Three, according to the transmission torque points

1. Drive shaft of minicar.

2, light vehicle transmission shaft.

3. Drive shaft of medium car.

4, heavy-duty vehicle transmission shaft.

5. Drive shaft of engineering vehicle.