Automobile transmission is the basis of automobile driving. The role of the automobile transmission system transfers the power output from the engine to the driving wheels to make the automobile move. The automobile transmission system is composed of a clutch, a transmission, a Propeller Shaft, a reducer, a differential, a half shaft, etc., and an all-wheel-drive automobile also includes a transfer case. According to the power source and transmission mode, the automotive transmission system is divided into four types.

What are the types of Propeller Shaft?

The transmission shafts are classified according to the transmission torque: there is mini-vehicle Propeller Shaft; light-duty vehicle Propeller Shaft; medium-duty vehicle Propeller Shaft; heavy-duty vehicle Propeller Shaft; engineering vehicle Propeller Shaft.

According to the angular velocity, rigid universal joints can be divided into unequal velocity universal joints, quasi-constant velocity universal joints and constant velocity universal joints. Constant speed and unequal speed refer to whether the rotational angular velocity of the driven shaft is equal when the driven shaft rotates with the driving shaft. Of course, the average speed of the driving shaft and the driven shaft are equal.

1. Constant velocity universal joint:

Universal joints whose angular velocities of the main and driven shafts are still equal when the angle between the two shafts are changed are called constant velocity universal joints or constant angular velocity universal joints. They are mainly used in wheel transmission devices such as steering drive axles and disconnected drive axles and are mainly used for power transmission in cars.

2, variable speed universal joint:

Universal joints whose angular velocities of the main and driven shafts are not equal when the angle between the two shafts are changed are called unequal-velocity universal joints, also called cross-shaft universal joints.

The cross-shaft rigid universal joint Propeller Shaft is the most widely used in the automotive driveline and has the longest history. When the car is rear-wheel drive, the cross-shaft universal joint Propeller Shaft is often used. For some high-end cars, constant velocity ball joints are also used; when the car is a front-wheel drive, constant velocity universal joints are often used-etc. Speed ​​universal joint is also a kind of transmission shaft, but the title is different. The Propeller Shaft usually refers to the cross shaft type rigid universal joint Propeller Shaft. Cross-shaft rigid universal joints are mainly used to transfer angle changes, generally by flange fork, cross shaft with needle roller bearing assembly, universal joint fork or sliding fork, intermediate connecting fork or spline shaft fork, needle roller bearing The axially fixed parts and other components.

Flange fork is a fork-shaped part with a flange, generally forged parts of medium carbon steel or medium carbon alloy steel, sand castings of ductile iron and precision castings of medium carbon steel or medium carbon high-quality alloy steel. The flange fork generally has a flat flange but also has a trapezoidal tooth flange on the end face. The cross shaft with needle roller bearing assembly generally includes four needle roller bearings, a cross shaft, and a grease nipple. Needle roller bearings are generally composed of several needle rollers, a bearing bowl, and a multi-blade rubber oil seal (partly with a skeleton). In some needle roller bearings, there is also a circular gasket with an oil groove, which is made of nylon, copper or other materials. It is mainly used to reduce the axial gap of the universal joint and improve the quality of the dynamic balance of the Propeller Shaft. . The universal joint fork is a fork-shaped part, generally forged parts of medium carbon steel or medium carbon alloy steel, and precision castings of medium carbon steel. The axial fixing parts of needle roller bearings are generally elastic retaining rings (internal and external clamping type) for holes (or shafts) or bearing pressure plates, lock plates, bolts, etc.

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