The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 1991
Filed:
Jun. 21, 1990
Applicant:
Inventor:
Kenzo Watanabe, Fuchu, JP;
Assignee:
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01L / ;
U.S. Cl.
CPC ...
123 9012 ; 123 9015 ;
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.