Automotive transmissions must meet a variety of requirements, including smooth shifting, high output power, compact structure, light weight, high efficiency, and low noise, and these requirements are getting higher and higher. Therefore, the performance of automotive gearbox bearings must also meet higher requirements.
The quality of automotive gearbox bearings is extremely important for the normal operation of the car. Although it seems that it does not have bearings or accessories such as engines and transmission shafts, the quality of automotive gearbox bearings is not necessary for the overall performance of the vehicle. A little bit sloppy.
Car gearbox function
The main function of the automobile gearbox is to realize the adjustment of the gear position of the automobile through the operation of the driver, such as neutral gear, reverse gear, gear shift, etc. The fundamental purpose of which is to change the transmission ratio between the engine and the driving wheels, so The mechanical traction and running speed can meet various working conditions of the car; realize the vehicle forward, backward, stop, etc.
In any kind of machinery, as long as it is applied to bearings, its main function is: to provide corresponding support is the main part, and its essence is to bear radial loads. Also, the shaft can be fixed so that the shaft cannot move radially or axially, and the shaft can only rotate. Based on the need for good operation of the bearing and reducing the bad interference formed by the bearing on the high-speed shaft, it is necessary to lubricate the bearing.
Transmission requirements on bearings
1. Consider the shape and connection dimensions of automotive gearbox bearings with variable speed transmission.
2. The variable speed transmission automotive gearbox bearings can be placed horizontally or vertically or inclined. Can rotate forward and reverse. Both positive and negative input and output power (ie deceleration or speed increase).
3. Regardless of the installation method used, automotive gearbox bearings with variable speed transmission have size matching requirements with their couplings.
Recommended use: H7 / h6 for the fit of the inner ring hole d and the shaft; H7 / r6 for the fit of the pin hole do in the middle ring and the drive; H8 / h7 for the fit of the outer ring D and the housing; holes for the drive and output shaft The use of clearance fits, the clearance is 0.2 ~ 0.5mm.
4. Axial positioning of automotive gearbox bearings with variable speed transmission: After any one of the three turns is axially positioned, the other two shafts do not need to be axially positioned.
5. Positioning in the direction of rotation; both the outer ring and the inner ring are positioned with flat keys. The middle ring is positioned using transmission.
6. The variable speed transmission bearing can bear a small external force in the radial direction, but should not bear a large working load.
7. The transmission ratio is based on the first installation method. If other installation methods are used, the transmission ratio should be calculated.
8. Under the rated speed (1500rpm), select the variable speed drive bearing model according to the transmission ratio and the required power (Kw).
9. When working torque is the basis, the model should be selected accordingly.
10. The selection of the reducer model is consistent with the model of the variable speed transmission automotive gearbox bearings.
