Yamaha Hatsudoki Kabushiki Kaisha

Nobuhiko Matsunaga

Yoshihiko Moriya

A valve-actuating variable cam for a reciprocating machine is disclosed. The cam comprises a camshaft journalled for rotation by said machine and driven in timed relationship with said machine, a first cam fixed upon said camshaft and rotatable with the camshaft, and a second cam fixed for rotation with the camshaft and moveable relative to the first said cam in a direction radial to the axis of rotation of the camshaft. A shift rod is slidably mounted within the cam shaft, the shift rod having a drive surface thereon driving a key element. The key element is at least partially positioned within and engages at least the second cam. The shift rod is moveable between a first position in which the first cam engages a valve or similar element, and second position in which the key pushes the second cam radially outwardly and the valve engages the second cam.

Valve-actuating variable cam for engine

A number of embodiments of valve-actuating mechanisms for reciprocating machines, such as internal combustion engines, are presented wherein the lift of the valve may be controlled. This is done by providing a pair of cams on the camshaft each of which cooperate with the same follower for commonly actuating the valve. One of the cams is radially shiftable relative to the axis of the camshaft so that it can either be brought into operative position wherein the lift is controlled by the second cam or an inoperative position where the lift of the valve is controlled by the first cam.

Engine valve operating system

A solenoid valve device and specifically a solenoid operated injection valve wherein the bouncing of the valve element upon closing is dampened. This is done by providing an inertial mass which is slidable relative to the stem portion of the valve element and contacts fixed abutments on the stem portion of the valve element to limit the relative movement in each direction. In addition, a cushioning arrangement is interposed between the inertial mass and the abutment for cushioning the stopping of the inertial mass.

Growing community of inventors

Iwata, Japan

Nobuhiko Matsunaga