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:
Feb. 22, 2000
Filed:
Dec. 11, 1998
Takeo Shirabe, Gotenba, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A valve characteristic control apparatus for controlling the operation characteristics of the valves of an internal combustion engine driven by a camshaft is disclosed. A working oil supply control valve is arranged in a support member for supporting the camshaft. A first oil path and a second oil path for leading the working oil from the working oil supply control valve to the first and the second oil chambers include an annular first oil path and an annular second oil path formed in the camshaft and the slide portion of the support member for pivotally supporting the camshaft, a first and a second in-support member oil path for connecting the annular first oil path and the working oil supply control valve and for connecting the annular second oil path and the working oil supply control valve. A bearing metal is arranged between the annular oil paths and the cam-side openings of the in-support member oil paths, and at least one of the in-support member oil paths, after reaching the back of the metal bearing from the working oil supply control valve, extends in an axial direction along the back of the bearing metal and communicates with a corresponding annular oil path at a different axial position from the back point reached by the same in-support member oil path.