Hydraulic circuit for a valve operating mechanism for an internal combustion engine

Patent · Tue Jan 31 04:00:00 EST 1989

OSTI ID:6268957

Yoshida, K; Fukuo, K

A hydraulic circuit is described for a valve operating mechanism for an internal combustion engine, having 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 being pivotable by cams rotatable in synchronism with a crankshaft, coupling means for selectively interconnecting and disconnecting the adjacent rocker arms under oil pressure to the coupling means, and an oil feed passage for lubricating the cams, an improvement comprising, the hydraulic circuit and the oil feed passage being connected in series to each other through restriction means. The hydraulic circuit includes directional control means 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 the engine.

• Assignee: Honda Giken Kogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4800850
• OSTI ID: 6268957
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONTROL
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FLUID MECHANICS
HEAT ENGINES
HYDRAULIC EQUIPMENT
HYDRAULICS
INTERNAL COMBUSTION ENGINES
LIQUID FLOW
LUBRICANTS
LUBRICATING OILS
LUBRICATION
MECHANICS
OILS
OPERATION
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PUMPS
RODS
SYNCHRONIZATION
VALVES