Jtekt Corporation

Yasuhiro Saitou

Hidetaka Otsuki

Yasuaki Tsuji

Akihiko Shiina

Tomonari Yamakawa

Masaki Nakaoka

Sunao Tsuchimochi

Shigeki Nagase

Takeshi Ueda

Katsutoshi Nishizaki

Masahiko Sakamaki

Toshiaki Oya

Shirou Nakano

Ken Matsubara

Yoshikazu Kuroumaru

Takayasu Yamazaki

Yasuhiro Kamatani

A transmission ratio variable mechanism is provided with: an input member and an output member capable of rotation about a first axis; an inner race for differentially rotatably coupling to each member; an outer race for rotatably supporting the inner race via a rolling element; and a transmission ratio variable mechanism-use electric motor for rotation-driving the outer race. A second axis which is a center line of the inner race and the outer race is inclined to the first axis. A first concave-convex engaging section for engaging one side end surface of the inner race and a power transmission surface of the input member corresponding to the one end surface are arranged. There is provided a second concave-convex engaging section for engaging the other end surface of the inner race and a power transmission surface of the output member.

Transmission ratio variable mechanism and motor vehicle steering system including the same

A motor vehicle steering system includes a transmission ratio variable mechanism capable of changing a transmission ratio, and a steering-assist-force imparting mechanism. The transmission ratio variable mechanism is provided with an input member and an output member capable of rotation about a first axis, a first bearing ring for differentially rotatably coupling to each of the input and output member, a second bearing ring for rotatably supporting the first bearing ring via a rolling element, and an electric motor for rotation-driving the second bearing ring. A second axis that is a center line of the first bearing ring and the second bearing ring is inclined relative to the first axis.

Motor vehicle steering system

A vehicle steering system including a transmission ratio variable mechanism that has a first shaft connected to a steering member and a second shaft connected to a turning mechanism, coupled coaxially to each other, and a transmission ratio variable mechanism motor disposed coaxially with the first and second shafts for driving the transmission ratio variable mechanism. The transmission ratio variable mechanism motor includes a tubular rotor, and an accommodation space is defined on the inner side in the radial direction of the tubular rotor. At least one of sensors is disposed inside the accommodation space.

An electric power steering system is provided which is capable of providing a favorable steering feeling without using compensation logics such as of inertia compensation and friction compensation. The electric power steering system includes road-noise suppression control means () for controlling a steering assist motor () in a manner to damp torque transmission in a higher frequency region representing road noises than a frequency region representing road information. A friction value of a steering mechanism (A) is decreased enough to allow the intrinsic vibrations of the steering mechanism (A) to appear. Rotor inertia of the steering assist motor () is set to a value small enough to allow the frequencies of the intrinsic vibrations to be present in the frequency region where the torque transmission is damped by the road-noise suppression control means ().

Electric power steering system

Growing community of inventors

Okazaki, Japan

Yasuhiro Saitou