| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing structure capable of reducing variation of a position of a rotation axis of a rotating shaft.SOLUTION: A bearing 43 has an outer peripheral face 43b including a circular arc-shaped circular arc face 43c projecting to a radial outer side toward an axial central portion from an axial end portion, and rotatably supports an internally inserted worm shaft 41. A gear housing 31 has a bearing accommodation recessed portion 38 recessed in a rotation axis L2 direction of the worm shaft 41 and accommodating and retaining the bearing 43. An inner peripheral face of the bearing accommodation recessed portion 38 has a cylindrical portion 54 in which the bearing 43 is disposed at its inner side, and a contact portion 55 having a part projecting to a radial inner side with respect to the cylindrical portion. The circular arc face 43c of the bearing 43 is kept into contact with the contact portion 55 at three points shifted from each other in a rotating direction of the worm shaft 41.SELECTED DRAWING: Figure 2 |
