| 摘要 |
The invention relates to a twin brake boosting servo including, in an outer casing (10), a fixed partition (11) defining, inside the casing (10), a front volume (A) and a rear volume (B), each volume (A, B) being divided in leaktight fashion into a front chamber (12, 18) and a rear chamber (14, 20) by a movable partition (16, 22), at least one elastic means (31) tending to move one (16) of the moving partitions (16, 22) towards the rear, at least one passage (39) connecting the two front chambers (12, 18), at least one passage (53) connecting the two rear chambers (14, 20), a pressure difference between the front chamber (18) and rear chamber (20) of the rear volume (B) by a valve means (35) when a control rod (27) is actuated in order to actuate an output rod (42). According to the invention, the front moving partition (16) and rear moving partition (22) are independent of one another, and means (52, 53, 54, 56) are provided for establishing a pressure difference between the rear chamber (14) of the front volume (A) and the rear chamber (20) of the rear volume (B). <IMAGE>
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