| 摘要 |
In order to provide additional pneumatic boosting which comes into play only for heavy braking, provision is made, in a pneumatic brake-booster, for some boosting force (28, 33) which is in addition to a boost force (25) normally applied by a reaction disk (24) to be absorbed. In a preferred example, force is absorbed by means of a slide (29) containing an envelope (31) and a plunger (30). The plunger is rigidly fixed to the first reaction device. The envelope rests against a piston (23) of the pneumatic booster. The plunger is expelled from the envelope by a spring (34), the excursion of which is countered by a peg (35) as long as the force applied by a driver is below an intermediate force. Beyond that, the reaction of a hydraulic braking circuit downstream compresses the spring and causes the additional pneumatic boosting to come into effect.
|
