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:
Sep. 10, 2002
Filed:
Oct. 18, 2001
Hiroyuki Kinugawa, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A valve timing control device includes a first rotor, a second rotor, a fitting hole, a tier control member, an accommodation hole, a first release hydraulic pressure chamber and a second release hydraulic pressure chamber. The first rotor rotates in synchronization with a crankshaft of an internal combustion engine and has a plurality of shoes, which are projected inwardly to define a plurality of hydraulic pressure chambers. The second rotor is fixed at an end of a camshaft of the internal combustion engine and has a plurality of vanes which partition the plural hydraulic pressure chambers of the first rotor into an advance side hydraulic pressure chamber and a retardation side hydraulic pressure chamber. The fitting hole is disposed at any one of the first rotor or the second rotor. The tier control member fits in the fitting hole to control a relative rotation of the first and second rotors and having a front minor diameter section and a rear major diameter section. The accommodation hole disposed at the other to accommodate the tier control member. The biasing member biases the tier control member in a direction of fitting the tier control member in the fitting hole. The first release hydraulic pressure chamber is defined between the front minor diameter section of the tier control member and the fitting hole. The second release hydraulic pressure chamber is defined between an end face of the rear major diameter section of the tier control member in an axial direction of the device and the accommodation hole. At least one of the advance and retardation side hydraulic pressure chambers communicates with both the first and second release hydraulic pressure chambers.