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:
Mar. 01, 2005
Filed:
Nov. 14, 2003
Akira Asai, Hiroshima, JP;
Masaki Fukuma, Hiroshima, JP;
Masahiro Naito, Hiroshima, JP;
Kouichi Shimizu, Hiroshima, JP;
Ikuma Takahashi, Hiroshima, JP;
Kazuhiro Tomizawa, Hiroshima, JP;
Akira Asai, Hiroshima, JP;
Masaki Fukuma, Hiroshima, JP;
Masahiro Naito, Hiroshima, JP;
Kouichi Shimizu, Hiroshima, JP;
Ikuma Takahashi, Hiroshima, JP;
Kazuhiro Tomizawa, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
In the variable valve timing system according to the present invention, portions of the intake-side advancing hydraulic line and a retarding hydraulic line respectively constitute annular groovesandfor advancing and retarding provided on the intake camshaftbearing surfaceof the cam capwhich supports the camshaftsand. In addition, portions of the advancing hydraulic line and the retarding hydraulic line for exhaust respectively constitute annular grooves for advancing and retardingandprovided on the exhaust camshaftbearing surfaceof the cam cap. Moreover, the annular groove for retardingon the intake camshaftbearing surfaceand the annular groove for advancingon the exhaust camshaftbearing surfaceare respectively provided in the center in the width direction of their respective bearing surfacesand