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. 17, 2012
Filed:
Apr. 21, 2009
Olivier Bernadat, Le Perreux, FR;
François Gaffe, Bondy, FR;
Laurent Lhuillier, Le Blanc Mesnil, FR;
Antony Auguste, Villier sur Marne, FR;
Carole Charpentier, Montmorency, FR;
Olivier Bernadat, Le Perreux, FR;
François Gaffe, Bondy, FR;
Laurent Lhuillier, Le Blanc Mesnil, FR;
Antony Auguste, Villier sur Marne, FR;
Carole Charpentier, Montmorency, FR;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to a master cylinder () with reduced free travel (). Current master cylinders have a free travel during the displacement of a piston () in a bore () of a master cylinder body (). Such a free travel may be reduced with the aid of a frustoconical portion () in the piston, an orifice () for communication of hydraulic fluid being situated on said inclined wall, a gap () between the inclined wall and an inner wall () of the bore allowing a passage for hydraulic fluid capable of filling a pressure chamber (). However, such inclined walls create a change in the slope of an outer wall () of the piston, this change being able to cause a separation of an inner lip () of a sealing cup (). To prevent this separation, the invention provides that the inclined wall forms a convex rounded surface ().