(EN) A pair of wedge-shaped pieces (24, 24) is provided so as to fill a ring-shaped space (34), which exists between the inner circumferential surface of a holding recess (21) and the outer circumferentialsurface of a bearing holder (22), at two locations of said ring-shaped space (34) that are symmetric with respect to an imaginary plane ([alpha]), which comprises the section where a worm wheel (13)meshes worm teeth (17) and the central axis of the worm (14). Elastic forces are applied on the two wedge-shaped pieces (24, 24) in the circumferential direction away from the meshing section. In a worm speed reducer provided with a biasing means for elastically biasing the worm teeth toward the worm wheel, it is thereby possible to prevent displacement of the distal end of the worm in a directionperpendicular to the biasing direction.
(ZH) 将1对楔状片(24、24)设置为:在存在于保持凹部(21)的内周面与轴承托架(22)的外周面之间的环状空间(34)中,在关于包含蜗轮(13)与蜗杆齿(17)的啮合部、以及蜗杆(14)的中心轴的虚拟平面(α)对称的2处位置填埋所述环状空间(34)。而且,对所述两个楔状片(24、24)付与在圆周方向上从所述啮合部离开的方向的弹力。由此,在包括将蜗杆齿向蜗轮弹性地施力的施力单元的蜗轮蜗杆减速器中,能够阻止蜗杆的末端部向与施力方向成直角的方向变位。