The original car was controlled by the rudder. It is difficult to control the direction of the vehicle by transferring the violent vibration to the driver. When the engine was installed in the front of the car, the driver could not use the rudder to drive the car because of the weight increase. The new design of steering wheel arises at the historic moment. The gear system introduced between the driver and the wheel can operate flexibly and isolate the violent vibration from the road. Not only that, a good steering wheel system can also give the driver a feeling of intimacy with the road.