Hydraulic circuit for a valve operating timing control device fo

Details Hydraulic circuit for a valve operating timing control device fo Hydraulic circuit for a valve operating timing control device fo

1987-12-24

1989-08-22

Wolfe, Willis R.

Internal-combustion engines

Poppet valve operating mechanism

Lubrication

123 9016, 123 9017, 123 9044, F01L 134, F01M 108, F01M 910

Patent

active

048585742

ABSTRACT:
A hydraulic circuit for a valve operation timing control device for an internal combustion engine which has a low-speed cam having a shape suited for low-speed operation of the engine, a high-speed cam having a shape suited for high-speed operation of the engine, the low- and high-speed cams being integrally formed on a camshaft rotatable in synchronism with a crankshaft, a first rocker arm held in slidable contact with the low-speed cam, a second rocker arm held in slidable contact with the high-speed cam. The first and second rocker arms are adjacent to and in slidable contact with each other and pivotably supported on a rocker shaft for relative angular displacement. There is a first oil feed passage for lubricating the low-speed cam and a second oil feed passage for lubricating the high-speed cam. The first rocker arm has a hydraulic lash adjuster and a relief valve is disposed in the oil passage for supplying oil pressure to said hydraulic lash adjuster for maintaining a predetermined oil pressure on the hydraulic lash adjuster.

REFERENCES:
patent: 3628513 (1971-12-01), Grosseau
patent: 3782357 (1974-01-01), Kuhn et al.
patent: 4441465 (1984-04-01), Nakamura
patent: 4535732 (1985-08-01), Nakano et al.
patent: 4537165 (1985-08-01), Honda et al.
patent: 4644912 (1987-02-01), Umeha et al.
patent: 4656977 (1987-04-01), Nagahiro et al.
patent: 4709667 (1987-12-01), Ichihara et al.

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