transmission shaft
The role of the drive shaft is self-evident. Here we focus on a brief introduction to the universal transmission device (universal joint transmission) on the drive shaft.
On 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 a relative movement between the input shaft of the drive shaft final reducer and the output shaft of the transmission (or transfer case). In addition, in order to effectively avoid certain mechanisms or devices (linear transmission cannot be achieved), there must be a device to realize the normal transmission of power, so the universal joint transmission appears. The universal joint drive must have the following characteristics:
a. Ensure that the power can be reliably transmitted when the relative positions of the two connected shafts change within the expected range;
b. Ensure that the connected two shafts can run evenly. The additional load, vibration and noise due to the included angle of the universal joint should be within the allowable range;
c. 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 an unequal speed relative to the input shaft (with a certain included angle), double universal joints (or multi-cardan joints) must be used for this purpose. And arrange the two universal joint forks connected with the transmission shaft on the same plane, and make the included angles of the two universal joints equal. This is very important. In the design, the included angle of the universal joint should be minimized.
Driveshaft assembly imbalance is a major cause of driveline flexural vibration. The vibration noise it causes is obvious. In addition, the axial movement of the universal joint cross shaft, the gap in the sliding spline of the transmission shaft, the centering accuracy of the connection between the two ends of the transmission shaft assembly, the elastic deformation of the transmission shaft during high-speed rotation, and the balance of spot welding on the transmission shaft The thermal influence factors of the film can change the unbalance of the drive shaft assembly. Reducing the unbalance of the drive shaft is extremely important for automobiles, especially high-speed automobiles such as (cars), otherwise many related failures or abnormal damages will be caused.
Post time: Aug-28-2022