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:
Jun. 14, 1988
Filed:
Oct. 30, 1986
Juan Belart, Moerfelden-Walldorf, DE;
Alfred Teves GmbH, Frankfurt am Main, DE;
Abstract
A hydraulic power booster, in particular for the actuation of a master cylinder in a brake system of an automotive vehicle is disclosed including a pressure fluid source, a valve assembly by means of which the pressure fluid is adapted to be introduced into a booster chamber in dependence upon an actuating force. An axially slidable stepped booster piston confines the booster chamber and is provided with two piston parts of different diameters which are movable axially relative to one another by a predetermined amount. To enable instantaneous pressure build-up in the working chambers of the master cylinder upon commencement of braking, an intermediate piston part is coupled to the primary piston of the master cylinder and is caused to move ahead of the actual booster piston part. Movement of the auxiliary piston part is achieved by passing the pressure fluid from the booster chamber through a channel in the booster piston part to an intermediate chamber wherein the fluid acts on the effective area of the auxiliary piston part. Discharge of the fluid through the channel is damped by a throttle and a nose portion of the auxiliary piston is slidably received in a blind bore in the booster piston providing damped auxiliary piston movement.