WORM BIASING STRUCTURE

摘要

A worm biasing structure that biases a worm toward a worm wheel in a biasing direction, includes: a radial bearing that supports the worm in a radial direction; a bearing holder that has a holder hole for accommodating the radial bearing; a biasing member for biasing the radial bearing toward the worm wheel; and a housing that has a housing hole for accommodating the bearing holder, a pair of guide surfaces is formed as defined herein, when the bearing holder is accommodated in the housing hole and the radial bearing is not accommodated in the bearing holder, a distance between the pair of guide surfaces is smaller than or equal to an outer diameter of the radial bearing, and a gap is formed between an outer surface on the outer side of the guide surface and the housing hole.

主权项

1. A worm biasing structure that biases a worm toward a worm wheel in a biasing direction, the worm biasing structure comprising:
a radial bearing that supports the worm in a radial direction; a bearing holder that has a holder hole for accommodating the radial bearing; a biasing member for biasing the radial bearing toward the worm wheel; and a housing that has a housing hole for accommodating the bearing holder, wherein a pair of guide surfaces is provided at an inner circumferential surface of the bearing holder surrounding the holder hole so that the radial bearing is interposed between the pair of guide surfaces when the radial bearing is accommodated in the holder hole, and the pair of guide surfaces extends in the biasing direction and guides the radial bearing in the biasing direction, when the bearing holder is accommodated in the housing hole and the radial bearing is not accommodated in the bearing holder, a distance between the pair of guide surfaces is smaller than or equal to an outer diameter of the radial bearing, and in the bearing holder, an outer side of the guide surface is thinned so that a gap is formed between an outer surface on the outer side of the guide surface and the housing hole.