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:
Apr. 26, 2016
Filed:
Mar. 29, 2011
Lothar Schiel, Hofheim, DE;
Lothar Schiel, Hofheim, DE;
Abstract
A 'brake-by wire' brake system for motor vehicles, with a brake master cylinder which can be actuated by a brake pedal and has a housing and a piston, which is arranged displaceably in the housing and, together with the housing, delimits a pressure space. The piston of the brake master cylinder is designed as a stepped piston with at least two hydraulic active surfaces A, Aof differing size, wherein a first, small active surface Ais assigned to the pressure space, and a second, large active surface Ais assigned to a filling space, and, after a closing travel has been overcome, the second, large hydraulic active surface Ais effective and the active surface A, Aare switched over in dependence on a hydraulic pressure in the pressure space and on the pedal force, respectively.