| 摘要 |
A brake-force booster for a motor-vehicle braking system has a booster housing, with a force-input member which is capable of being coupled to a brake pedal and which can be inserted into the booster housing against the action of a return spring, with a force-output member which is capable of being coupled to a brake cylinder, with a chamber arrangement with a working chamber and a vacuum chamber, which are separated by a movable wall, with a control-valve arrangement arranged between the force-input member and the force-output member, wherein the control-valve arrangement exhibits a first valve seat for optional connecting of the working chamber to external atmosphere, and a second valve seat for optional connecting of the working chamber to the vacuum chamber. A setting of the response force of the brake-force booster is effected by means of a stop sleeve on which the return spring is supported, whereby for the purpose of setting a bias of the return spring the stop sleeve is capable of being displaced relative to the force-input member and is capable of being fixed to the latter in a setting position.
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