The steering shaft assembly is the core part of the automobile steering system. The function of the steering shaft is to transmit the steering torque applied to the steering wheel by the driver to the steering gear. Its upper part is fixedly connected with the steering wheel, and the lower part is connected with the steering gear. The steering shaft passes through the steering column tube and is supported on bearings and bushes in the column tube.
The performance of the steering shaft is directly related to traffic and personal safety, so there are several requirements for the design of the steering shaft.
1. The steering shaft should have a certain rigidity. Ensure that the steering torque and steering angle on the steering wheel are transmitted to the steering gear;
2. Due to the improvement of highway conditions, the increase of vehicle speed and the increasingly strict road safety regulations, the steering shaft should have an energy-absorbing function to prevent injury;
3. The steering shaft should have good fatigue resistance to ensure its service life.
4. In addition to flexible universal joints, the steering shafts of modern cars are equipped with mechanisms that can change the working angle of the steering wheel (the transmission direction of the steering shaft) and the height of the steering wheel (the axial length of the steering shaft). To facilitate the manipulation by different drivers.