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. 10, 2004
Filed:
Apr. 04, 2002
Jean-Marc Attard, Villers sous St Leu, FR;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A braking device, for a motor vehicle, comprising: a master cylinder ( ), a primary piston ( ) mounted to slide in the master cylinder, a manual-control member ( ), a booster coupled to the manual-control member, an emergency assist valve (VA) comprising a reaction piston ( ) and a rapid piston ( ), and a ratio control (T) actuated by a plunger distributor ( ) driven by the manual-control member ( ). The reaction piston ( ) and the rapid piston ( ) form one and the same stepped piston ( ) having a part ( ) of large cross section and a part ( ) of small cross section, the large-section part ( ) determining, with a first bore ( ) of the primary piston ( ), a variable-volume annular chamber ( ). A separation/communication assembly ( ), controlled by the displacement of the stepped piston ( ), is designed so that the pressure of the liquid is exerted effectively on the large cross section ( ) of the stepped piston when the stepped piston occupies a position of rest or is to the rear of the position of rest, and on only the small cross section ( ) when the stepped piston is displaced forward relative to the main piston under emergency braking.