Tappet device in internal combustion engine

Abstract

Abstract PURPOSE:To aim at reducing the fuel consumption of an engine during running at a low speed, by providing tow rocker arms which are made into contact with high and low speed cams, respectively, and by providing a means for changing over between the coupling and releasing of both rocker arms. CONSTITUTION:When an engine runs, for example, at a low speed, the coupling between first and second rocker arms 7, 8 is released by a coupling change-over means 21. That is, hydraulic pressure in a hydraulic pressure chamber 29 is released so that a stopper 24 is moved toward the first rocker arm 7 by means of a spring 25, and a piston 23 is retracted until it abuts against a stepped part 27. Then, the abutting surfaces of the piston23 and the stopper 24 correspond to the sliding surfaces of both rocker arms 7, 8 so that both rocker arms 7, 8 fall in such a condition that they are angularly displaced relative to each other. As a result, the first rocker arm 7 is swung in accordance with the slide operation of thereof with a speed reducing cam 3 in association with the rotation of a cam shaft 2 and therefore, both intake valves 1a, 1b are opened and closed having timings and lifts which are different from each other.

Inventors

• 👤 Kazuo Inoue
• 👤 和雄 井上
• 👤 Kenichi Nagahiro
• 👤 長弘　憲一
• 👤 Yoshio Ajiki
• 👤 安食　嘉夫
• 👤 Masaaki Kato
• 👤 加藤　正彰

Bibliographic Details