Views: 4 Author: Site Editor Publish Time: 2022-04-29 Origin: Site
Drive shaft is a rotating body with high speed and little support, so its dynamic balance is very important. The general drive shaft before leaving the factory must be into the action balance test, and the balance machine has been adjusted. For front-engine and rear-wheel drive cars, it is the shaft that transfers the transmission's rotation to the main reducer. It can be several sections, which can be connected by universal joints.
The drive shaft is an important part of the transmission of power in the car drivetrain. Its role is to transfer the power of the engine to the wheels together with the gearbox and drive axle, so that the car produces driving force.
Special purpose vehicle drive shaft is mainly used in tank cars, refueling vehicles, sprinklers, sewage trucks, suction trucks, fire trucks, high-pressure cleaning vehicles, road wreckers, aerial work vehicles, garbage trucks and other models.
The drive shaft is composed of shaft tube, telescopic sleeve and universal joint. The telescopic sleeve can automatically adjust the change of distance between the transmission and the drive axle. Universal joint is to ensure the change of the Angle between the two axes of the transmission output shaft and the input shaft of the drive axle, and realize the equiangular speed transmission of the two shafts.
Universal joint is the key part of automobile drive shaft. A car is a moving object. On the rear-drive car, the engine, clutch and transmission are mounted on the frame as a whole, while the drive axle is connected to the frame by an elastic suspension. There is a distance between the two that needs to be connected. The uneven road surface caused the car to jump.
General universal is joined by cross shaft, cross bearing and flange fork composition. Universal joint is the key part of automobile drive shaft. In the front engine rear wheel drive vehicle, the universal joint drive shaft is installed between the transmission output shaft and the drive axle main reducer input shaft; In front-engine, front-wheel drive vehicles, the drive shaft is omitted, and the universal joint is installed between the front axle, which is responsible for both driving and steering, and the wheels. Uneven road surface in the operation of the vehicle jump, load change or two assembly installation position difference, will make the transmission output shaft and the drive axle input shaft between the Angle and distance change, so to use a "to change the strain" device to solve this problem, so there is the universal joint.
In front engine rear wheel drive or all-wheel drive the car, because the car suspension deformation in the process of movement, the main reducer input shaft drive shaft and transmission (or transfer case) often have relative movement between the output shaft, moreover, to effectively avoid some institutions or device, the inability to achieve linear transfer, must have a device to realize the dynamic normal delivery, Then came the universal joint drive. The universal joint transmission must have the following characteristics: a. Ensure that the power can be transferred reliably when the relative position of the two connected shafts changes within the expected range; B. Ensure that the two connected shafts can operate evenly. Additional load, vibration and noise caused by the universal joint Angle should be within the allowable range; C, high transmission efficiency, long service life, simple structure, convenient manufacturing, easy maintenance.
For the automobile, because the output shaft of a cross shaft universal joint relative to the input shaft (has a certain Angle) is not equal rotation, so we must use double universal joint (or multi-universal joint) transmission, and the two universal joint fork connected with the transmission shaft arranged in the same plane, and make the Angle of the two universal joints equal. This is very important. The included Angle of universal joint should be reduced as far as possible.
The traditional structure of the transmission shaft expansion sleeve is spline sleeve and flange fork welding together, spline shaft welding on the transmission shaft tube. The new drive shaft changes the traditional structure, spline sleeve and drive shaft tube welding into a body, spline shaft and flange fork made into a body. The rectangular tooth spline is changed into a high pressure Angle involute short tooth spline, which not only increases the strength, but also is easy to extrude and meet the needs of high torque conditions. On the tooth surface of telescopic bushing and spline shaft, the whole coated with a layer of nylon material, not only increases the wear resistance and self-lubrication, but also reduces the impact load on the drive shaft damage, improve the buffer capacity.
This kind of drive shaft in the flange spline shaft increased a tubular sealing protective sleeve, in the protective sleeve end is provided with two polyurethane rubber oil seal, so that the telescopic sleeve formed a completely sealed space, so that the telescopic spline shaft is not eroded by external dust, not only dust and rust. Therefore, in the assembly in the spline shaft and sleeve one-time smear grease, it can fully meet the requirements of use, do not need to install grease nozzle lubrication, reduce the maintenance content.
It is designed to reduce friction and wear when the shaft moves. The basic purpose is the same as bearing, and the relative cost is cheaper, but the friction resistance is larger, so it can only be used in some parts. Most of the bushing is made of copper, but there is also plastic bushing. The shaft sleeve is placed in the shaft and supporting structure, and very close to the supporting structure, only the shaft can rotate on the shaft sleeve. When assembling shafts and bushings, lubricants are added between them to reduce friction as they rotate.