Koyo Seiko Company, Ltd.

Oiles Corporation

Jtekt Corporation

Katsutoshi Nishimura

Masahiko Hirose

Kazuhiro Yamamoto

Masao Shimura

Yoshiro Kuzumi

Akihiko Shiina

Tetsuya Murakami

Masayuki Watanabe

Takahiro Tanaka

Masanori Kobayashi

Takeo Iino

Masaaki Hashimoto

Masahiko Noguchi

Keiji Nomura

Hiroyuki Shigemura

Masashi Uota

Shoji Shibamura

Tomoharu Horiuchi

Kazunori Okamoto

Hirohisa Nakao

Ken-ichiroh Aoto

Yoshio Itou

A method of manufacturing a rack guide base body wherein a cavity () is formed which has a pair of semicylindrical convex surfaces (and) and a pair of flat surfaces () each located between the semicylindrical convex surfaces (and), and has a recessed surface () located on one axial end portion side inwardly of the semicylindrical convex surfaces (and) and the flat surfaces () and a cylindrical surface () located on the other axial end portion side inwardly of the semicylindrical convex surfaces (and) and the flat surfaces (); a hollow portion () is formed for allowing the cavity () to communicate with a hollow portion () at one flat surface () and with a hollow portion () at the other flat surface (); a rack guide base body () is die cast by forcing molten metal of aluminum from the hollow portion () into the cavity (); and runners () integrally joined to flat surfaces () of the rack guide base body () formed by the respective flat surfaces () are cut off.

Method of manufacturing rack guide base body in rack-and-pinion type steering apparatus and rack guide

A rack guide includes a rack guide base body which has on its outer peripheral surface a pair of semicylindrical surfaces and a pair of planar surfaces each located between the pair of semicylindrical surfaces, has a concavely recessed surface located on one axial end portion side inwardly of the pair of semicylindrical surfaces and the planar surfaces, and has a cylindrical surface located on the other axial end portion side inwardly of the pair of semicylindrical surfaces and the planar surfaces; and a slider secured to the rack guide base body.

Method of production rack guide base body in rack-and-pinion type steering device and rack guide

An electric power steering system is provided, which comprises a steering assist electric motor, and a reduction gear mechanism for reducing a rotation speed of a rotatable shaft of the electric motor. The reduction gear mechanism comprises a worm shaft driven by the rotatable shaft, and a worm wheel driven by the warm shaft. The electric power steering system further comprises a joint for coupling the rotatable shaft to the worm shaft for transmission of a driving force. Longitudinally biasing means is provided in association with the joint for longitudinally biasing the worm shaft.

Electric power steering system

A hydraulic power steering device responsive to the speed of a vehicle and comprising a housing, an output shaft disposed in the housing, an input shaft disposed in the housing and coaxial with the output shaft, a torsion bar provided between the output shaft and the input shaft, a control valve provided around the input shaft for controlling the amount of pressure oil to be supplied from a hydraulic pump to a power cylinder in accordance with the torsion of the torsion bar, and plungers each slidably fitted in a hole formed in the output shaft, each of the plungers being adapted to be pressed at its forward end against the input shaft by oil pressure in accordance with the vehicle speed to obtain a reaction. At least one of the portion of the plunger slidable in contact with the inner peripheral surface of the output shaft defining the hole and the portion of the plunger to be pressed into contact with the input shaft is made of a synthetic resin.

Hydraulic power steering device responsive to speed of vehicle

Growing community of inventors

Osaka, Japan

Katsutoshi Nishimura