Oiles Corporation

Mazda Motor Corporation

Noboru Nakagawa

Kazuhiko Akeda

Katsunori Saito

Hiroyuki Kikuchi

Hiroshi Ohashi

Masaya Kinjyo

Toshihiko Sekine

Gaku Ikeyama

Yosuke Nishitani

Junya Kuwagaki

Shunya Oda

Shuichi Yamaguchi

Daisuke Yoshimoto

Eiichi Yamashita

Kosuke Shimayama

Sho Yamaguchi

Provided is a rack bush capable of reducing an effect on the feeling of a steering operation. A rack bush () comprises: a rack bushhoused in a cylindrical housing (), which supports a load applied to a rack bar () while allowing movement of the rack bar () in the direction of the axis (O) and can be freely expanded and contracted in the radial direction; and elastic rings () mounted on the bush body (). The bush body () has mounting grooves (), which are formed in the circumferential direction on an outer peripheral surface () for mounting the elastic ring (). An axis (P) of the mounting groove () are shifted from the axis (O) of the bush body (). By this arrangement, there are formed an elastic ring protruding part (), where the elastic rings () protrude greatly from the outer peripheral surface () of the bush body (), and an elastic ring embedded part (), where the elastic rings () are embedded in the outer peripheral surface () of the bush body ().

Rack bush and steering mechanism

The objective of the present invention is to reduce the impact of production variability in a radius of curvature of a rear surface of a rack bar, for example, while enlarging a region of contact with the rack bar. A concave surface () is used as a rack guide seat () sliding surface (). In a YZ cross section perpendicular to an axial direction of a rack bar, the concave surface () includes: a pair of first arcuate surfaces (A,B) which are disposed on a peripheral edge side () of the sliding surface (), from two positions of contact TA, TB with a rack bar rear surface (), the positions of contact TA, TB having line symmetry with respect to a straight Line Ojoining a center O of a rack bar () with a bottom portion center C of the sliding surface (), and which have line symmetry with respect to the straight Line O; and a pair of second arcuate surfaces (A,B) which are disposed on a bottom portion side () of the sliding surface (), from the positions of contact TA, TB, and which have line symmetry with respect to the straight Line O. With regard to gaps to the rack bar rear surface () in positions separated by the same distance from the positions of contact TA, TB, the gaps from the first arcuate surfaces (A,B) are greater than the gaps from the second arcuate surfaces (A,).

Rack guide and gear mechanism

A sliding bearingwhich is interposed between a tubeand a rack shaftincludes a bearing bodyand two elastic ringsandfitted on an outer surfaceof the bearing body, and the bearing bodyhas slitsextending from an end faceto this side of an end face, slitsextending from the end faceto this side of the end face, an inner surfacehaving a sliding surface, and an outer surfaceon which are formed groovesrespectively receiving the elastic ringsandand projectionsandrespectively provided on axial end portionsandwith the groovesdisposed therebetween.

Sliding bearing and bearing mechanism having the same

A slide bearing which can be manufactured at low cost is provided. The slide bearing () is provided with a cylindrical bearing main body () into which a shaft member is inserted, and an elastic ring () for urging the bearing main body () diametrically inward, the elastic ring () being mounted to the bearing main body (). The bearing main body () has a sliding surface () which slides against the outer peripheral surface of the inserted shaft member, a plurality of first slits () running along the direction of an axis O from one end surface () toward another end surface (), a plurality of second slits () running along the direction of the axis O from the other end surface () toward the one end surface (), a plurality of first elastic ring interlocking parts () protruding diametrically outward at one end part () of the outer peripheral surface (), and a plurality of second elastic ring interlocking parts () protruding diametrically outward at another end part () of the outer peripheral surface (). The first elastic ring interlocking parts () and the second elastic ring interlocking parts () are positioned so as not to overlap each other seen in an imaginary plane P perpendicular to the axis O.

Slide bearing

A shaft coupling mechanismfor an electric power steering apparatus includes a coupling base bodycoupled to a rotating shaft; a coupling base bodycoupled to a rotating shaft; a rotation transmitting memberconstituted by a pair of rigid rotation transmitting membersanddisposed between the rotating shaftand the rotating shaftthrough both coupling base bodiesandand adapted to transmit the rotation of the rotating shaftin an R direction about an axis O to the rotating shaft; an elastic memberinterposed between the rotation transmitting membersandand coupled to the rotation transmitting membersandin such a manner as to be axially superposed on the rotation transmitting membersand; and a coupling meansfor coupling the pair of rotation transmitting membersandto each other.

Shaft coupling mechanism for electric power steering apparatus

A sliding bearingincludes a bearing base portionhaving a notched portion, a bearing portionhaving an outer peripheral surfaceadapted to be brought into contact with an inner peripheral surfaceof a gear case, a pair of bearing portionssandwiching the bearing portionthrough each of a pair of slitsin a direction R about an axis O, and a pair of circular arc portionssandwiching the pair of bearing portionsthrough each of a pair of slitsin the direction R about the axis.

Synthetic resin-made sliding bearing

A bush bearingincludes a synthetic resin-made bushhaving a circumferential grooveon an outer peripheral surfacethereof; an endless annular elastic memberfitted in the circumferential grooveof the bush; and a positioning meansfor determining the position of the bushin a B direction with respect to an inner peripheral surfaceof a gear housing

Bush bearing and rack-and-pinion type steering apparatus for automobile using the same

A shaft coupling mechanismincludes a coupling base bodycoupled to a rotating shaft; a coupling base bodycoupled to a rotating shaft; a pair of rotation transmitting membersandinterposed between both coupling base bodiesandand adapted to transmit the rotation of the rotating shaftin an R direction to the rotating shaftthrough both coupling base bodiesand; an intermediate interposed memberinterposed between the pair of rotation transmitting membersand; and a coupling meansfor coupling the pair of rotation transmitting membersandto each other.

Shaft coupling mechanism

A more durable rotation transmitting member for a coupling directly connected to shafts has: drive-side rotation transmitting cushion to which an input shaft is directly connected; and a hub to which an output shaft is directly connected. Two parallel flat surfaces are formed on the outer periphery of the front end of the input shaft, and a shaft hole receives the front end of the input shaft and is formed in the rotation transmitting cushion. Surfaces of the inner wall of the shaft hole protrude toward the axis (O) to face input shaft front end flat surfaces. Each protruding surface comprises two flat sloped surfaces extending in the direction of the axis (O). When the input shaft starts to rotate, each front end flat of the front end comes into surface contact with one of the protruding surface sloped surfaces which faces the flat surface.

Rotation transmitting member, coupling directly connected to shafts, and shaft connecting mechanism

A bush bearing includes a bearing body having an inner peripheral surface which is brought into contact with a cylindrical outer peripheral surface of a rotating shaft portion so as to be rotatable in a first direction, a groove provided on an outer peripheral surface of the bearing body so as to extend in the first direction, and an elastic ring fitted on said groove and having a pair of projecting portions and a portion, the pair of projecting portions partially projecting radially outward from the outer peripheral surface of said bearing body in second direction, the portion being provided at positions in the first direction between the pair of projecting portions, and not projecting radially outward from the outer peripheral surface of the bearing body.

Bush bearing

A shaft coupling mechanism for an electric power steering apparatus includes a coupling base body coupled to a rotating shaft on a side of an electric motor; a coupling base body coupled to a steering shaft; rotation transmitting members interposed between both coupling base bodies and adapted to transmit the rotation of the rotating shaft in an R direction to the steering shaft through both coupling base bodies; an intermediate interposed member interposed between the coupling base bodies; and a coupling means for coupling the rotation transmitting members to each other.

A shaft coupling mechanismfor an electric power steering apparatus includes a coupling base bodycoupled to a rotating shafton a side of an electric motor; a coupling base bodycoupled to a steering shaft; rotation transmitting membersandinterposed between both coupling base bodiesandand adapted to transmit the rotation of the rotating shaftin an R direction to the steering shaftthrough both coupling base bodiesand; an intermediate interposed memberinterposed between the coupling base bodiesand; and a coupling meansfor coupling the rotation transmitting membersandto each other.

A bush bearingincludes a bearing bodyhaving an inner peripheral surfacewhich is brought into contact with a cylindrical outer peripheral surfaceof a rotating shaft portionso as to be rotatable in an R direction, groove meansprovided on an outer peripheral surfaceof said bearing bodyso as to extend in the R direction, and elastic ring meansfitted on said groove meansand having a pair of projecting portionsandand portion, the pair of projecting portionsandpartially projecting radially outward from the outer peripheral surfaceof said bearing bodyin an A direction, the portionbeing provided at positions in the R direction between the pair of projecting portionsand, and not projecting radially outward from the outer peripheral surfaceof said bearing body

Growing community of inventors

Fujisawa, Japan

Noboru Nakagawa