Koyo Seiko Company, Ltd.

Masashi Uota

Akihiko Shiina

Tetsuya Murakami

Masanori Kobayashi

Takeo Iino

Katsutoshi Nishimura

Hiroyuki Shigemura

Yoshio Itou

Shoji Shibamura

Ken-ichiroh Aoto

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

In a power transmission ring, a plastic ring is provided with first and second tapered raceway surfaces on one and the other of lateral surfaces thereof, the first and second tapered raceway surfaces conforming to first and second power transmission surfaces of first and second sheaves, respectively. A metallic ring is provided with first and second tapered surfaces on one and the other of lateral surfaces thereof in parallel relation with the first and second raceway surfaces, respectively, and unified with the plastic ring.

Power transmission ring and variable diameter pulley assembly using the same

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Yamatokooriyama, Japan

Masashi Uota