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. 04, 1998
Filed:
Dec. 26, 1996
Kazuhiko Suzuki, Kariya, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
The present invention is directed to a vacuum servo unit which is characterized in that a movable power piston has an outer cylindrical portion, an inner cylindrical portion, and a connecting portion for connecting an inner cylindrical portion to an outer cylindrical portion, the connecting portion has an input side end portion being shaped to be convex towards an input side so that a width in a peripheral direction thereof decreases towards the input side, a first path is provided in the connecting portion for communicating the variable pressure chamber with an inside space of the inner cylindrical portion, a second path is provided in the movable power piston for communicating the constant pressure chamber with the space between the outer cylindrical portion and the inner cylindrical portion. Accordingly, this vacuum servo unit can smoothly decrease the servo force for the movable power piston and the output force and restrain the production of the sound.