Apparatus for changing operation timing of valves for internal c

Details Apparatus for changing operation timing of valves for internal c Apparatus for changing operation timing of valves for internal c

1987-10-14

1990-03-13

Dolinar, Andrew M.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

F01L 134

Patent

active

049075500

ABSTRACT:
Valve operating apparatus is disclosed in which intake or exhaust valves for an internal combustion engine are operated by rocker arms driven by cams and have a hydraulically operated coupling mechanism for selectively connecting or disconnecting adjacent rocker arms to vary the operation timing of the valves under different engine operating conditions. The fluid circuit for operating the coupling mechanism contains a valve which is energized to a closed position during low-speed engine operation and de-energized to an open position during high-speed engine operation.

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