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. 24, 2009
Filed:
Sep. 12, 2007
Kinya Takahashi, Obu, JP;
Masayasu Ushida, Okazaki, JP;
Takao Nojiri, Anjo, JP;
Seiji Yaokou, Anjo, JP;
Jun Yamada, Okazaki, JP;
Kinya Takahashi, Obu, JP;
Masayasu Ushida, Okazaki, JP;
Takao Nojiri, Anjo, JP;
Seiji Yaokou, Anjo, JP;
Jun Yamada, Okazaki, JP;
Denso Corporation, Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
A phase control valve, which supplies a drive hydraulic pressure to an advance chamber or a retard chamber, is integrated with a drain switch valve, which controls opening and closing of an advance drain control valve and opening and closing of a retard drain control valve, to form a solenoid spool valve. The advance drain control valve is provided in an advance check valve bypass passage, which bypasses an advance check valve, and is driven by a pilot hydraulic pressure to open and close the advance check valve bypass passage. The retard drain control valve is provided in a retard check valve bypass passage, which bypasses a retard check valve, and is driven by a pilot hydraulic pressure to open and close the retard check valve bypass passage.