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:
Nov. 10, 1998
Filed:
Sep. 18, 1997
Michio Adachi, Obu, JP;
Teruki Kataoka, Chita, JP;
Denso Corporation, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In a rotational phase adjusting apparatus which may be used for adjusting valve timing of an engine, a stopper piston is set engageably into and disengageably from a tapered hole of a shoe housing so that relative pivotal motion between the shoe housing and a vane rotor is constrained at the most retarted position. A hydraulic pressure chamber communicates with a retard-side hydraulic pressure chamber while a hydraulic pressure chamber communicates with an advance-side hydraulic pressure chamber. A pressurized area of the stopper piston receiving hydraulic pressure from the hydraulic pressure chamber in a direction of releasing constraint is set to be larger than a pressurized area of the stopper piston receiving hydraulic pressure from the hydraulic pressure chamber in the direction of releasing constraint. When working oil is supplied to the advance-side hydraulic pressure chamber from a state where the stopper piston is fitted into the tapered hole, the stopper piston is drawn out from the tapered hole assuredly even in the case of low hydraulic pressure.