Yamaha Hatsudoki Kabushiki Kaisha

Yoshitaka Nagai

Hiroyuki Tsuzuku

Hidetoshi Ishigami

Wataru Ishii

Minoru Yamamoto

Takayuki Gouke

Kyouji Morita

Hayato Tanokura

Toshio Matsubara

Wataru Ishi

Yasushi Ishizuka

Hironori Funakushi

Tomoyasu Atsumi

Kensuke Yamamoto

A cam sensor is provided in a position opposing one surface side of a cam driven sprocket in a valve timing control device. When the valve timing control device is in a high revolution state, a weight is pivoted by centrifugal force caused by the rotation. This allows a projection at the weight to be detected by the cam sensor. In this case, for each rotation of the valve timing control device, the projection of the weight passes the detectable position of the cam sensor and a pulse is generated in a cam signal to be transmitted from the cam sensor to an ECU.

Variable valve system, and engine system and vehicle including the same

When an engine operates at low engine speed, the tip end of a cam nose of an intake cam is at a second position. As the engine speed increases and exceeds a first engine speed, the tip end of the cam nose of the intake cam moves to a first position. When the engine operates at high engine speed, the tip end of the cam nose of the intake cam is at the first position. As the engine speed decreases and becomes lower than a second engine speed smaller than the first engine speed, the tip end of the cam nose of the intake cam moves to the second position different from the first position.

Valve timing control device and engine device and vehicle including the same

Growing community of inventors

Shizuoka, Japan

Yoshitaka Nagai