The hypoid bevel gear used in medical devices like electric wheelchair. The reason is because
1. the axis of the driving bevel gear of the hypoid gear is offset downward by a certain offset relative to the axis of the driven gear, which is the main feature that differentiates the hypoid gear from the spiral bevel gear. This feature can reduce the position of the driving bevel gear and the transmission shaft under the condition of ensuring a certain ground clearance, thereby lowering the center of gravity of the body and the whole vehicle, which is beneficial to improve the driving stability of the vehicle.
2.The hypoid gear has good working stability, and the bending strength and contact strength of the gear teeth are high, so the noise is small and the service life is long.
3. When the hypoid gear is working, there is relatively large relative sliding between the tooth surfaces, and its movement is both rolling and sliding.