Constant velocity joint drive shaft, joint drive shaft

The role of the drive shaft in auto parts is still very powerful and should not be underestimated. In a car with front-engine rear-wheel drive (or all-wheel drive), due to the deformation of the suspension during the movement of the car, there is often relative movement between the input shaft of the drive shaft final drive and the output shaft of the transmission (or transfer case). In addition, in order to effectively avoid certain mechanisms or devices (which cannot achieve linear transmission), there must be a device to achieve the normal transmission of power, so joint transmission appears.

Constant velocity joint drive shaft-function

Constant velocity joints are joints that transfer the output shaft and input shaft connected to the joint at an instantaneous angular velocity that is always equal. Constant velocity joint is a mechanism that connects two shafts whose axes do not coincide, and makes the two shafts transmit motion at the same angular velocity. It is a joint where the rotation speed (angular velocity) of the driving shaft and the driven shaft are equal. In front-wheel drive cars, the front axle is equipped with a constant velocity joint drive shaft (drive and steering).

Constant velocity joint drive shaft-working principle

In order to meet the angle changes caused by the up and down jumps generated by power transmission, steering and car running, joints are also commonly used between the drive axle of the front drive car and the axle shaft and the wheel axle. Due to the limitation of the axial size, the required deflection angle is relatively large, and ordinary joints are difficult to handle. Therefore, various constant velocity joints are widely used. In general front-drive vehicles, each half shaft uses two constant velocity joints. The joint near the transaxle is the inner joint of the half shaft, and the outer joint of the half shaft is near the axle. Among various constant velocity joints, the common one is the ball-cage joint, which uses six steel balls to transmit force. When the driving shaft and the driven shaft are at any angle, the steel balls are located at the intersection of the two circles. , Which is located on the bisecting plane of the intersection angle of the two shafts, so as to ensure the angular velocity transmission of the main and driven shafts.

Constant velocity joint drive shaft-features

a. Ensure that the power can be reliably transmitted when the relative position of the two connected shafts changes within the expected range;

b. Ensure that the connected two shafts can run evenly. The additional load, vibration and noise caused by the included angle of the joint should be within the allowable range;

c. High transmission efficiency, long service life, simple structure, convenient manufacturing and easy maintenance. For automobiles, because the output shaft of a cross-shaft joint rotates at unequal speeds relative to the input shaft (with a certain included angle), double joints (or multiple joints) must be used for transmission. The two joint forks connected with the drive shaft are arranged on the same plane, and the angles of the two joints are equal. This is very important. The angle of the joint should be minimized when designing.

We understand the role of constant velocity joint drive shaft, and we can't ignore it in maintenance. In order to ensure the dynamic balance of the drive shaft, you should always pay attention to whether the balance pads are unsoldered. The new drive shaft assembly is provided as a complete set. When installing the new drive shaft, pay attention to the assembly mark of the telescopic sleeve and ensure that the flange fork is in a plane. When repairing and disassembling the drive shaft, the assembly mark should be printed on the telescopic sleeve and the flange shaft in order to keep the original assembly relationship unchanged during reassembly.