Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1987-12-24
1989-01-31
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9034, 123 9036, F01L 118, F01L 126, F01M 910
Patent
active
048008508
ABSTRACT:
A hydraulic circuit for a valve operating mechanism for an internal combustion engine which has a plurality of intake or exhaust valves normally urged in a valve closing direction, a plurality of adjacent rocker arms associated respectively with the intake or exhaust valves and pivotably supported on a rocker shaft. The rocker arms are pivotable by cams rotatable in synchronism with a crankshaft. A coupling mechanism is provided in the rocker arm selectively interconnecting and disconnecting adjacent rocker arms in response to oil pressure. A hydraulic circuit supplies oil pressure to the coupling means and an oil feed passage lubricates the cams. The hydraulic circuit and oil feed passage are connected in series to each other through a flow restriction and the hydraulic circuit includes a directional control valve for changing the direction of flow of lubricating oil supplied from an oil pump to cause the lubricating oil to flow from the oil feed passage to the hydraulic circuit during low-speed operation of the engine and to cause the lubricating oil to flow from the hydraulic circuit to the oil feed passage during high-speed operation of said engine to always provide the proper oil pressure levels in the oil feed passage and the hydraulic circuit.
REFERENCES:
patent: 3628513 (1971-12-01), Grosseau
patent: 3782357 (1974-01-01), Kuhn et al.
patent: 4441465 (1984-04-01), Nakamura
patent: 4535732 (1984-08-01), Nakano et al.
patent: 4537165 (1985-08-01), Honda et al.
patent: 4545342 (1985-10-01), Nakano et al.
patent: 4656977 (1987-04-01), Nagahiro et al.
patent: 4709667 (1987-12-01), Ichihara et al.
Fukuo Koichi
Yoshida Kazuo
Honda Giken Kogyo Kabushiki Kaisha
Wolfe Willis R.
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