Jtekt Corporation

Koyo Seiko Company, Ltd.

Hiroyuki Shigemura

Akihiko Shiina

Tetsuya Murakami

Wataru Yamada

Takeo Iino

Masanori Kobayashi

Shingo Ougita

Katsutoshi Nishimura

Masashi Uota

Ryousuke Yamazaki

Ken-ichiroh Aoto

Yoshio Itou

Shoji Shibamura

An electric power steering apparatus comprises a transmission mechanism having a drive gear and a driven gear. One end of the drive gear is supported by a bearing hole in a housing through a bearing and a curved plate spring. The curved plate spring comprises a main body surrounding the bearing and at least one crank-shaped elastic tongue supported by at least one of ends of the main body. A recess formed on an inner peripheral surface of the bearing hole has a bottom and a pair of inner wall surfaces opposed to each other in the circumferential direction of the bearing hole. A relief portion for avoiding contact with a connection portion of the elastic tongue is formed between at least one of the inner wall surfaces and the inner peripheral surface of the bearing hole. A boundary between the relief portion and the inner peripheral surface of the bearing hole is engaged with the main body of the curved plate spring, to restrict the movement of the main body in the circumferential direction.

Electric power steering apparatus

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

Growing community of inventors

Kashiwara, Japan

Hiroyuki Shigemura