公开(公告)号：US12038079B2

公开(公告)日：2024-07-16

申请号：US17617551

申请日：2020-03-03

Applicant: KYB Corporation

Inventor： Hiroki Masuda ,  Yoshimasa Inaba

IPC: F16H57/02 ,  F16H55/24 ,  F16H57/021

CPC classification number: F16H57/021 ,  F16H55/24 ,  F16H2057/0213

Abstract: A worm shaft includes: an insertion portion; a wall surface; a tapered portion; and a main body portion, the gear portion is formed on the main body portion and the tapered portion such that a bottom land of the gear portion is positioned at radially outer side of a line extending in parallel with a rotation center axis of the worm shaft and passing through a boundary between the wall surface and the tapered portion.

公开(公告)号：US11878740B2

公开(公告)日：2024-01-23

申请号：US17603898

申请日：2020-04-02

Applicant: MAZDA MOTOR CORPORATION ,  KYB CORPORATION ,  OILES CORPORATION

Inventor： Gaku Ikeyama ,  Kazuya Sato ,  Junya Kuwagaki ,  Yoshimitsu Fumimoto ,  Masaki Takahashi ,  Tomonori Taniguchi ,  Takuzo Ito ,  Mitsuhiko Fujikake ,  Hiroki Masuda ,  Hiroyuki Kikuchi ,  Jun Ouchi ,  Kazuhiko Akeda

IPC: B62D3/00 ,  B62D3/12 ,  F16C29/02 ,  F16C35/02

CPC classification number: B62D3/123 ,  F16C29/02 ,  F16C35/02

Abstract: A clearance is created between an inner circumference of a bushing main body (2) which surrounds a rack (5) across a row of rack gear teeth (50) and an outer circumference of the rack (5), and two supporting surfaces (21A, 21B) which face each other with a bushing main body axis O therebetween and a supporting surface (21C) which faces a back surface of the rack (5), each extending along an x-axis direction, are formed on the inner circumference of the bushing main body (2). The rack (5) in a neutral state is supported by the two supporting surfaces (21A, 21B) so as to be displaceable along a z-axis direction, and the rack (5) in operation is stably supported by the three supporting surfaces (21A-21C) at three places. A groove bottom position of an annular elastic member attachment groove (24), which is formed on an outer circumference of the bushing main body (2), is offset toward the support surface (21B) only in an area on a support surface (21B) side from the bushing main body axis O, and therefore an elastic ring (3) attached to the elastic member attachment groove (24), protrudes above an outer circumferential surface of the bushing main body (2), but only in the area on the support surface (21B) side from the bushing main body axis O.