| 摘要 |
PCT No. PCT/FR97/02234 Sec. 371 Date Dec. 16, 1997 Sec. 102(e) Date Dec. 16, 1997 PCT Filed Dec. 9, 1997 PCT Pub. No. WO98/38070 PCT Pub. Date Sep. 3, 1998A brake device having a master cylinder (1) connected to a pneumatic booster (2). The pneumatic booster (2) having a rigid casing (3) in which a partition (4) moves to delimit a front chamber (5) from a rear chamber (6). The casing (3) has a front shell (31) which is secured to the master cylinder (1) to form a first wall for the front chamber (5) and a rear shell (32) which forms a second wall for the rear chamber (32). In order to increase the absorption of kinetic energy in the event of an impact force being applied to the front shell (31), the front shell (31) has a peripheral member (311) secured to the rear shell (32) and a central member (312) secured to the master cylinder (1). The peripheral member (311) has a larger relative diameter (D1) than the diameter (D2) for the central member (312). The peripheral member (311) and the central member (312) are connected together in an annular overlap region (313) in a manner such that in at least the overlap region (313) the peripheral part is located in an axial direction closer to the master cylinder (1). In response to a predetermined frontal or oblique impact force being applied to the front shell (31), the connection in the overlap region (313) separates to absorb kinetic energy and prevent such impact force from being transmitted to an operator. |
