Koyo Seiko Company, Ltd.

Tomomasa Machida

Souichi Iwasa

Tomohiro Maekawa

Hiroaki Murakami

Kaname Joshita

Etsurou Kitami

Yasuhiro Nakamura

Tomonori Sugiura

Teruo Tsutsui

A motor-driven type power steering apparatus includes: a drive gear connected to an output shaft of a motor; a driven gear in mesh with the drive gear, which is connected to a steering unit; a bearing for supporting one end of the drive gear; a support portion in which the bearing is disposed; and a curved leaf spring which has a length larger than a peripheral length of the bearing and fitted between the bearing and the support portion in a resiliently deformed state. The curved leaf spring urges the bearing so that a distance between an axis of the driven gear and an axis of the drive gear decreases.

Motor-driven type power steering apparatus

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

Growing community of inventors

Osaka, Japan

Tomomasa Machida