Valve system of multiple cylinder internal combustion engine

Abstract

Abstract PURPOSE:To control a valve system with higher accuracy by operating a suction valve and an exhaust valve in a certain set of cylinders in a different mode from that of a suction valve and an exhaust valve in another set of cylinders at least under a certain operating condition of an engine. CONSTITUTION:During low-speed operation of an engine, high pressure oil is not supplied to an oil pressure supply passage 31, and each oil pressure chamber 29 of the respective connection switching mechanisms 11 in tappet valve mechanisms 1, 1a, so that the respective connection switching mechanisms 11 are in the release state. At this time, in the first and fourth cylinders C1, C4, a rocker arm 9 is brought into sliding contact with a raised portion 4 not to be oscillated, so that a suction valve V is still closed. Further, in the second and third cylinders C2, C3, a rocker arm 9a is brought into sliding contact with a cam 5 for low speed, so that a suction valve V is opened and closed. On the other hand, during high-speed operation, high pressure oil is supplied to the above oil pressure supply passage and oil pressure chamber so that the respective connection switching mechanism 11 are in the state of connection. Accordingly the respective rocker arms 9, 9a are rocked, so that each suction valve V is brought into sliding contact with a cam 6 for high speed to be opened and closed.

Inventors

• 👤 Tsuneo Konno
• 👤 常雄 今野

Bibliographic Details