| 摘要 |
A ball bearing helical gearing for an electromechanical steering system of a vehicle includes a threaded spindle and a nut. The threaded spindle and nut are provided with ball bearing raceways for jointly accommodating load-transferring ball bearings inside the nut, and the nut has ball bearing routing parts for guiding out and introducing the ball bearings into the ball bearing raceways. In order to create a ball bearing helical gearing whose ball bearing guidance enables a uniform, low-noise operation of the ball bearing helical gearing, particularly when the threaded spindle is acted upon by lateral forces, it is provided that the nut comprising the ball bearing routing parts is, in its transition area into the ball bearing raceways, designed in such a manner that a fork structure of a gothic raceway profile of the ball bearing raceways is formed in this area at the height of a contact or pressure angle, and a contact surface of the ball bearing raceways of the threaded spindle with regard to the ball bearings that changes in an almost continuously progressive manner is ensured for a defined jolt-free entering and exiting of the ball bearings into and out of a load entry and load exit zone. The ball bearings are arranged in a closed chain over approximately two or more threads in the ball bearing raceways. |
