The cross shaft type rigid universal joint drive shaft is widely used in the automobile transmission system and has the longest history. Usually said the drive shaft refers to the cross shaft type rigid universal joint drive shaft. The cross shaft type rigid universal joint is mainly used to transfer the change of Angle, which is generally composed of 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 axial fixing parts and so on. Lug fork is usually connected with gearbox, drive axle or other drive shaft. Flange fork is a fork with flange, generally used in the forging of medium carbon steel or carbon alloy steel, but also used in the sand casting of nodular iron and medium carbon steel or carbon high quality alloy steel precision casting. Flange fork with a flat flange in general, but also with a face trapezoidal tooth flange. The cross shaft with needle roller bearing assembly generally includes four needle roller bearings, a cross shaft and a grease nipple. Needle roller bearing generally consists of a number of needle roller, 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, some nylon, some copper or other materials, mainly used to reduce the universal joint axial clearance, improve the quality of dynamic balance of the drive shaft. The universal joint fork is a forked part, generally USES the medium carbon steel or the medium carbon alloy steel forgings, also has USES the medium carbon steel the precision casting. Needle roller bearing axial fixed parts are generally hole (or shaft) with elastic baffle ring (internal and external type), or bearing pressure plate, locking plate, bolt, etc.

Another important component of the drive shaft is the sliding spline pair, which consists of the inside spline and the outside spline (rectangle, involute), and is used to transfer the change in length. The swing Angle of the universal joint of the transmission shaft and the maximum amount of expansion and contraction of the sliding spline pair are determined according to the check of the transmission shaft jumping when the whole vehicle is arranged. Drive shaft tube is generally made of low carbon steel sheet rolled steel pipe, for large size of the shaft tube, but also the use of cold drawn seamless tube. The outside diameter and wall thickness (or inside diameter) of the shaft tube are determined according to the conditions such as the maximum working torque and maximum working speed transmitted by the drive shaft. The hollow shaft tube has a smaller mass and can transmit a larger torque, and has a higher critical speed than the solid shaft with the same outer diameter. Generally, the center distance of two universal joints shall not be more than 1.5m. When the distance is relatively close, it is generally composed of two universal joints and a sliding spline pair, without axial tube in the middle. When the distance is relatively far and the length of the transmission shaft exceeds 1.5m, it is often divided into two or three, with three or four universal joints, and the last one with sliding spline pair, the rest with intermediate support structure. A typical intermediate bearing is generally composed of a cylindrical ball bearing, a bearing seat, two oil seals, a rubber pad, a grease nozzle. The intermediate driving shaft is connected to the frame beam by the intermediate supporting bracket, and the axis line of the intermediate driving shaft is required to be perpendicular to the middle supporting plane. Generally, the intermediate support of the drive shaft is required to be arranged on the first critical speed node of the drive shaft system. In use process, need to maintain on time commonly. In the universal joint, sliding spline pair, middle support and other places with grease nozzles, it is necessary to add regular grease according to relevant regulations. There is also the use of maintenance-free transmission shaft, in the universal joint and the middle of the bearing bearing bearing is reserved grease, do not need regular filling grease.

The above contents are provided by xingtai yuantuo auto parts manufacturing co., LTD.

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