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:
Jun. 05, 2007
Filed:
Sep. 16, 2005
Kotaro Watanabe, Kanagawa, JP;
Hidekazu Yoshida, Kanagawa, JP;
Tomoya Tsukada, Kanagawa, JP;
Jiro Miyasaka, Legal Representative, Chiba, JP;
Ayako Miyasaka, Legal Representative, Chiba, JP;
Kotaro Watanabe, Kanagawa, JP;
Hidekazu Yoshida, Kanagawa, JP;
Tomoya Tsukada, Kanagawa, JP;
Jiro Miyasaka, legal representative, Chiba, JP;
Ayako Miyasaka, legal representative, Chiba, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A valve timing control apparatus for an internal combustion engine includes a housing having a housing body and shoes protruding from an inner circumferential surface of the housing body to define actuation spaces therebetween, a vane rotor disposed in the housing and having a rotor body and vanes protruding from an outer circumferential surface of the rotor body to divide the actuation spaces into circumferentially alternating first and second hydraulic chambers, a plurality of spring units arranged in at least either the first hydraulic chambers or the second hydraulic chambers to bias the vane rotor in a rotational direction with respect to the housing, and a rotation restriction mechanism capable of restricting a relative rotation of the housing and the vane rotor to prevent the shoes and the vanes from contact with each other within the hydraulic chambers in which the spring units are arranged.