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:
Aug. 02, 2011
Filed:
Nov. 28, 2008
Toshiki Fujiyoshi, Okazaki, JP;
Osamu Sato, Takahama, JP;
Toshiki Fujiyoshi, Okazaki, JP;
Osamu Sato, Takahama, JP;
Denso Corporation, Kariya, JP;
Abstract
A valve timing control apparatus for controlling valve timing includes a first rotor, a second rotor, and a controller. The second rotor and the first rotor defines therebetween an advance chamber and a retard chamber. The controller includes a supply passage, at least one drain passage, a spool valve, at least one connection passage, and at least one check valve. The at least one connection passage connects the supply passage to the at least one drain passage when a spool of the spool valve is moved to one of the advance and retard positions. The at least one check valve is respectively provided in the at least one connection passage. The check valve allows working fluid to flow in a direction from the at least one drain passage toward the supply passage and limits working fluid from flowing in an opposite direction.