Valve timing control system for an internal combustion engine

Details Valve timing control system for an internal combustion engine Valve timing control system for an internal combustion engine

1990-06-21

1991-04-09

Okonsky, David A.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9015, F01L 902

Patent

active

050055402

ABSTRACT:
A hydraulic valve lifter is disposed between a cam and a valve. The hydraulic valve lifter comprises a cylindrical lifter body, a cam piston slidably mounted in the lifter body, and a lifter piston slidably mounted in the lifter body. The cam piston engages with the cam and the lifter piston engages with the valve. A hydraulic circuit is provided for supplying oil to an oil chamber in the valve lifter. An electromagnetic relief valve is provided in a relief passage for draining the oil chamber. The relief valve is closed in accordance with engine operating conditions, thereby controlling the valve timing.

REFERENCES:
patent: 4671221 (1987-06-01), Geringer et al.
patent: 4688525 (1987-08-01), Nakamura
patent: 4696265 (1987-09-01), Nohira
patent: 4867113 (1989-09-01), Pieprzak et al.
patent: 4873949 (1989-10-01), Fujiyoshi et al.
patent: 4889084 (1989-12-01), Rembold
patent: 4889085 (1989-12-01), Yagi et al.
patent: 4892067 (1990-01-01), Paul et al.

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