Patent ID: 9027340
Filing Date: 2015-05-12
Classification: B60T

Abstract:
1. Brake booster for an automotive brake system with regenerative brake force generation comprising: a force input element that is adapted to be coupled to a brake pedal, a chamber arrangement having a vacuum chamber and a working chamber that are separated from one another by a movable wall, and a control valve, by means of which in accordance with a displacement of the force input element, the working chamber is connectable selectively to the vacuum chamber and the atmosphere for generating and reducing a differential pressure at the movable wall, wherein the control valve has a control valve housing that is connected for joint movement to the movable wall, wherein, in a first actuation phase of the brake booster from its rest position, the force input element is displaceable relative to the control valve housing by an idle travel, in which the control valve remains non-actuated to suppress a build-up of a differential pressure at the movable wall, and wherein the control valve, in the first actuation phase, provides a fluidic connection between vacuum chamber and working chamber and, in a second actuation phase after exceeding of the idle travel by the force input element, the control valve switches over to build up a differential pressure at the movable wall, wherein the control valve has a valve element that may be laid sealingly against a first sealing seat, which is formed on the control valve housing and used for the fluidic separation of vacuum chamber and working chamber, and that may be laid sealingly against a second sealing seat, which is formed on a transmission element and used for the fluidic separation of working chamber and ambient atmosphere, wherein in the first actuation phase, the first sealing seat is lifted off the valve element and the second sealing seat lies sealingly against the valve element, wherein a stop device is formed on the control valve housing that determines the idle travel and retains the control valve housing in a starting position associated with the rest position.