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:
Oct. 10, 2000
Filed:
Jun. 02, 1999
Masanori Koda, Kanagawa, JP;
Unisia Jecs Corporation, Atsugi, JP;
Abstract
In a camshaft phase changing apparatus for an internal combustion engine, a plurality of sealed surfaces are formed between an inner peripheral surface of a predetermined hole (a retaining hole formed in an engine cylinder block) present between respective annular hydraulic introducing grooves and an outer peripheral surface of a valve body of an electromagnetic type hydraulic control valve and a length of one of the sealed surfaces having a first difference in pressure is set to be longer than that of the other of the sealed surfaces having a second difference in pressure, the first difference in pressure being larger than the second difference in pressure. In the embodiment, an axial length (S1, S1) of each of the one of the sealed surfaces is set to be longer than that (S2, S2) of each of the others of the sealed surfaces.