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. 22, 2001
Filed:
Feb. 18, 2000
Helmut Heibel, Moschheim, DE;
Josef Knechtges, Mayen, DE;
Abstract
A fully hydraulic brake power generator/master cylinder unit (,) for a vehicle brake system has a housing (,) with a bore (,) which is formed therein and in which a primary piston (,) is arranged sealingly and displaceably. Located in the bore (,) is a first pressure chamber (,), one boundary wall of which is formed by one end wall (,) of the primary piston (,). In order to actuate the unit (,), there is an input member (,) which is displaced during actuation. A hydraulic booster stage (,), which has a booster chamber (,) with an inlet for hydraulic fluid under pressure, acts on the primary piston (,). In order to improve the simulation of brake pressure feedback via the input member (,), a spring arrangement (,) is provided, with a first spring (,) and a second spring (,) which are connected in series. The spring force of the second spring (,) is detectably greater than the spring force of the first spring (,). When the unit (,) is actuated, if the hydraulic booster stage (,) fails essentially only the force of the first spring (,) determines the brake pressure feedback.