Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Shuzo Sanda

Masataka Osawa

Yuji Iwase

Hiroyuki Nishizawa

Masami Sugaya

Naoki Moriguchi

Naoto Tanaka

Kisaburo Hayakawa

Kazuyoshi Ogawa

Masanobu Kimura

Tomohiro Suzuki

Takanori Abekura

Toshinari Sano

A controller determines a target gear ratio from an accelerator opening and a vehicle speed. The controller determines the stroke of a trunnion on the basis of the difference between present inclination and a target inclination, thereby to control stroke by a hydraulic control valve. The stroke is corrected according to input/output disc pushing force.

Speed change control apparatus for toroidal CVT

A friction transmission unit for transmitting power between input and output members by means of friction and capable of loss reduction and large torque transmission. Power is transmitted between a planar disk () and a roller (), which contacts the upper surface of the planar disk (). The profile of the peripheral surface () of the roller () which actually contacts the upper surface () of the disk () is expressed as z=a&#xb7;sin h(bx). This profile realizes a contact stress distribution which is constant over an area corresponding to approximately 80% in the width direction of the entire contact region. This profile also prevents formation of peak stresses near and at the edges of the contact region and, instead, enables formation of monotonic decrease of stress in areas near the edges.

Friction transmission unit

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Nagoya, Japan

Shuzo Sanda