How the Universal Joint Drive Shaft Works?


The custom universal joints drive shaft is a very impor […]

The custom universal joints drive shaft is a very important part of auto parts. 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, the drive shaft main reducer input shaft and transmission output There is often relative movement between axes. In addition, in order to effectively avoid certain mechanisms or devices, there must be a device to realize the normal transmission of power, so universal joint transmission appears.

Constant velocity universal joint drive shaft is a universal joint that transfers the output shaft and input shaft connected to the universal joint at the same instantaneous angular velocity. Constant velocity universal 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 universal joint where the rotation speed of the driving shaft and the driven shaft are equal. In front-wheel drive cars, the front axle is equipped with a constant velocity universal joint drive shaft.

In order to meet the angle changes caused by the up and down jumps caused by power transmission, steering and car running, universal 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 universal joints are difficult to handle, so all kinds of constant velocity universal joints are widely used. In general front-drive vehicles, each half shaft uses two constant velocity universal joints. The universal joint near the transaxle is the inner universal joint of the half shaft, and the outer universal joint of the half shaft is near the axle. Among various constant velocity universal joints, the common one is the ball-cage universal 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. , That is, on the bisecting plane of the angle of the two shafts, so as to ensure the angular speed transmission of the main and driven shafts.

Constant velocity universal joint drive shafts generally have the following characteristics:

  1. Ensure that the power can be reliably transmitted when the relative position of the two connected shafts changes within the expected range;
  2. Ensure that the connected two shafts can run evenly. The additional load, vibration and noise caused by the included angle of the universal joint should be within the allowable range;
  3. High transmission efficiency, long service life, simple structure, convenient manufacture and easy maintenance. For automobiles, since the output shaft of a cross-shaft universal joint rotates at unequal speeds relative to the input shaft, double universal joint transmission must be adopted for this purpose, and the two universal joint forks connected to the drive shaft must be arranged On the same plane, and make the angles of the two universal joints equal. Therefore, the angle of the universal joint should be minimized when designing.

In addition, 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 5-7126X 6H2577 universal joint relationship unchanged during reassembly.