Gear box for use as reduction gear of electric drive of vehicle door, has driving wheel, output wheel and twin gear wheel, where gear portion is formed at driving end, and output-side gear portion is coupled with drive shaft

摘要

The gear box (7) has a driving wheel (3), an output wheel (4) and a twin gear wheel (5), where a gear portion (5a) is formed at a driving end. An output-side gear portion (5b) is coupled with a drive shaft (2). The twin gear wheel is executed in a single piece. The gear portions, made of high strength material and low elasticity, withstand high rotational torque. The gear portions, made of low strength material and high elasticity, withstand low rotational torque. The gear portions are made of different plastic material, such as polyethylene and polyoxymethylene.