Koyo Seiko Company, Ltd.

Teruo Tsutsui

Hiroaki Murakami

Masanori Kobayashi

Takashi Tsutsui

Tomohiro Maekawa

Kaname Joshita

Etsuro Kitami

Etsurou Kitami

Tomomasa Machida

Takefumi Deyama

Kouji Ogushi

A wormis composed of an annular tooth bodyhaving a toothon the outer surface thereof, a core bodyinserted inside the annular tooth body; and an elastic coupler, which can be transformed in the radial direction, for coupling the core bodywith the annular tooth body. The wormis engaged with the worm wheel with the elastic couplerbeing transformed in the radial direction in such a manner that a negative amount of backlash is generated at the engagement portion. This can be also employed for the worm wheel. With a reduction gear combination having this structure, the backlash amount at the engagement portion can be adjusted to a proper amount without selecting elements such as the worm and the worm wheel to be assembled.

Gear, reduction gear combination and electric power steering apparatus

When a steering wheel is relatively quickly turned at the time of parking, before a first stopper mechanism located between an input shaft and an output shaft is operated, an elastic member attached to a movement end of a rack shaft comes into contact with a rack stopper of a rack housing , thereby absorbing the impact at the time of steering at parking. That is, the strike speed when contact portions of the first stopper mechanism are brought into contact with each other, is slowed down. Accordingly, the uncomfortable noise due to the strike sound is not given to the driver.

Power steering apparatus

Growing community of inventors

Yao, Japan

Teruo Tsutsui