Jtekt Corporation

Marugo Rubber Industries, Ltd.

Yoshiaki Izumi

Masahiko Hirose

Takahiro Tanaka

Shohei Fujita

Hirofumi Ishimi

Isao Torii

Makoto Miyawaki

Tsuneharu Takizawa

Toshiyuki Ohsara

Sosuke Imaoka

A rack bar includes: a rack tooth row including a plurality of rack teeth meshing with pinion teeth; a hardened layer provided continuously over an entire circumference of the rack tooth row; and a center portion provided inside the hardened layer and having lower hardness than the hardened layer. When the rack bar is viewed in an axial direction of the rack bar, a depth of the hardened layer from the following positions i), ii), and iii) increases in this order: i) a bottom land of the rack teeth; ii) a side of the rack bar relative to the bottom land; and iii) a back of the rack bar relative to the bottom land.

Rack bar and steering apparatus

A fitting structure includes an annular seal member; a first fitting member including a first tubular fitting portion having a tubular shape, a first holding portion that contacts the seal member from a first axial end side, and a first restricting portion provided at a position different from a position of the first holding portion; and a second fitting member including a second tubular fitting portion having a tubular shape that is fitted to the first tubular fitting portion from a second axial end side, a second holding portion that contacts the seal member from the second axial end side, and a second restricting portion that contacts the first restricting portion from the second axial end side in a state where the seal member is compressed by a prescribed amount between the first holding portion and the second holding portion.

Fitting structure and steering system including the same

With a rack-and-pinion mechanism, an impact force is absorbed and reduction in assembling performance is suppressed. An annular fitting groove () that extends in the circumferential direction of a rack guide () is formed in an outer peripheral face () of the rack guide (), and an O-ring () is fitted in the fitting groove () in a state in which the axial movement of the O-ring () is restricted. A communication groove () that provides communication between an internal space (), defined by the fitting groove () and the O-ring (), and the outside of the rack guide () is formed in the rack guide ().

Rack-and-pinion mechanism and steering system

Growing community of inventors

Okazaki, Japan

Yoshiaki Izumi