Abstract: A reaction device wherein a ratio of input force to output force for a brake booster is sequentially changed during a brake application. An actuation force derived from a pressure differential acts on a movable wall and is communicated through a cage as an output force to an push rod. The output force is a functional ratio of the input force as modified by a reaction disc and elastic means during a brake application. The reaction device functions as a rigid member until the input force reaches a first predetermined level Fd and a first boost ratio is in effect until a second predetermined force Fe is reached and a second boost ratio is in effect until a third predetermined input force level Ff is reached and a third boost ratio is in effect until a fourth predetermined fource level is reached.
Type:
Grant
Filed:
January 25, 2002
Date of Patent:
August 23, 2005
Assignee:
Robert Basach GmbH
Inventors:
Juan Simon Bacardit, Bruno Berthomieu, Fernando Sacristan