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:
Feb. 18, 2003
Filed:
Oct. 15, 2001
Jean Pierre Gautier, Aulnay-Sous-Bois, FR;
Maurice Gerbauer, Sevran, FR;
Miguel Perez, Argentuil, FR;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A pneumatic servomotor ( ) for an assisted braking having a housing, separated by a diaphragm ( ) into a first variable-volume chamber ( ) and a second variable volume chamber ( ) therein. During a. brake application a force applied to a control rod ( ) moves to allow a first flap ( ) to isolate the second chamber ( ) from the first chamber ( ) and thereafter allow a second flap ( ) to open and allow pressurized assist fluid to be communicated to the second chamber ( ). The diaphragm ( ) has a lip ( ) thereon that engages the housing to define a thrust chamber ( ). On opening of the second flap ( ) allows the pressurized assist fluid is initially communicated to the thrust chamber ( ) and only after a predetermined travel of the control rod ( ) is the pressurized assist fluid communicated to the second chamber ( ) for creating a pressure differential between the fluid in the first chamber ( ) and second chamber ( ) to develop an output force to effect a brake application. On termination of the input force to the control rod ( ) the lip ( ) provides for one-way isolation to permit the discharge of the assistance fluid from second chamber ( ) to allow for equalization of fluid pressure in the first ( ) and second ( ) chambers.