| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a steering load in a steering range in which a driving source for assisting steering is not operated by means of a deep groove ball bearing for supporting a worm which is turned by the driving source without adding a special mechanism, and further to suppress the play of the worm in the radial direction. <P>SOLUTION: The worm 2 is turned by means of an electric motor 1 for assisting the steering. The end of the worm 2 on the opposed side to the driving source is supported by the deep groove ball bearing 7 on a housing. The deep groove ball bearing 7 has an inner race 71 having a raceway groove 71a having a radius of curvature of 52.5 to 75% of the diameter of a ball and/or has an outer race 72 having a raceway groove 72a having a radius of curvature of 53.5 to 85% of the diameter of the ball. The end of the worm 2 on the side of the driving source is supported by means of a bearing member 6 so as to relatively move in the longitudinal direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
