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:
May. 08, 2001
Filed:
Jan. 21, 2000
Helmut Heibel, Moschheim, DE;
Abstract
A fully hydraulic brake booster/master cylinder unit (,) for a vehicle brake system has a housing (,) and a bore (,) which is formed therein and in which is arranged sealingly and displaceably a primary piston (,) which is coupled to an input member (,) for transmitting an actuating force to the primary piston (,). Located in the bore (,) are a first pressure chamber (,), one boundary wall of which is formed by one end wall (,) of the primary piston (,), and a first booster chamber (,), one boundary wall of which is formed by the other end wall (,), located opposite the end wall (,), of the primary piston (,). The first booster chamber (,) has an inlet for hydraulic fluid under pressure which is used for boosting the actuating force. In order to bring about additional brake boosting comfortably and as required, there is arranged in the bore (,) a second booster chamber (,), to which hydraulic fluid under pressure can be supplied independently of the first booster chamber (,). In a preferred embodiment, an auxiliary piston (,) which is arranged sealingly and floatingly in the bore (,) forms with one end wall (,) a further boundary wall of the first booster chamber (,) and with its opposite other end wall (,) a boundary wall of the second booster chamber (,).