In the ball bearing helical gear feature for the electric machine type steering system of ball bearing helical

摘要

This invention the screw type spindle (2) and had the nut (3), it is something regarding the ball bearing helical gear mechanism for the electrical machinery type steering system of the especially automobile of the vehicle, the above-mentioned screw type spindle (2) and the nut (3) the ball bearing which supports the load inside ball bearing route in order together to accommodate (5) (4) is offered to the nut (3), the nut (3) the ball bearing (5) ball bearing route (4) the ball bearing route modification component in order it discharges and to introduce inside and includes (6). Especially, when cross direction power affects in the screw type spindle (2), because the ball bearing is guided ball bearing helical gear mechanism (1) by uniform low noise operation, the transfer territory (8) it possesses the ball bearing route modification component (6) the nut which (3), contact or compressed angle (22) from height ball bearing route (4) Gothic style route profile (16) fork structure the screw type spindle being formed in the transfer territory and for the ball bearing (5) (2) ball bearing route (4) the contact area abbreviating continuing to be modified progressively to ball bearing route (4), load introduction and load discharge area (10) fromIn order to guarantee introduction and the discharge where the smooth ball bearing (5) is stipulated, it is constituted. The ball bearing (5) ball bearing route (4) the chain which is closed over the screw turn of abbreviation two or more (7) is arranged in inside.