Yamaha Hatsudoki Kabushiki Kaisha

Kazuya Koike

Toshihiko Takahashi

A variable valve device is constructed to prevent inclination of a sliding surface of a high speed rocker arm. In an engagement surface where a connecting pin and the engagement portion of a high speed rocker arm are in contact, the center of the width of the surface in the direction of the cam shaft is provided closer to the high speed rocker arm than the center of the width in the direction of the camshaft of a cam contact surface where the high speed cam and the sliding surface of the high speed rocker arm are in contact. The low speed rocker arm includes a cam receiver and a connecting portion. The width of the connecting portion is larger than that of the cam receiver. The side surface of the connecting portion projects beyond the side surface of the cam receiver. The high speed rocker arm includes a cam receiver and a connecting portion. The side surface of the connecting portion and the side surface of the connecting portion are provided in the cam contact surface and within the width of the surface in the direction of the camshaft.

Variable valve device for engine

An engine having a variable valve mechanism arranged to switch a lift degree of a valve between a low speed state and a high speed state includes a cam carrier defined by a cam bearing portion, a rocker shaft support, and a hydraulic cylinder support. The cam bearing portion is provided on a line passing through the bore center of a cylinder in a plane perpendicular or substantially perpendicular to the camshaft. The low speed rocker arm swings in response to the low speed cam of the camshaft. The high speed rocker arm swings in response to the high speed cam of the camshaft. The low speed rocker arm includes a through hole. A connecting pin is slidably inserted into the through hole and urged toward the hydraulic cylinder support. A hydraulic cylinder is provided in the hydraulic cylinder support.

Growing community of inventors

Shizuoka, Japan

Kazuya Koike