| 摘要 |
The invention concerns a brake device consisting of a master cylinder (1) and a pneumatic brake booster unit (2), the brake booster comprising in particular a rigid housing (3) in which a partition (4), movable along a first axial direction (X), defines a front chamber (5) and a rear chamber (6), the case comprising a front shell (31) integral with the master cylinder and forming a wall for the front chamber, and a rear shell (32) forming a wall for the rear chamber. The invention, which aims at increasing the kinetic energy absorption of the system in the event of an impact, is characterised in that the front shell (31) comprises a peripheral portion (311), of relatively larger diameter (D1), integrated with the rear shell (32), and a central portion (312), of relatively smaller diameter (D2), integrated with the master cylinder (1), while the peripheral (311) and central (312) portions overlap in an annular overlapping zone (313), and, in the overlapping zone, the peripheral portion (311) is locally at least more salient than the central portion (312) along the first axial direction (X).
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