| 摘要 |
To reduce the distortion of a servo booster housing during use, the booster is provided with one or more ties that extend through a movable wall, transmitting reaction forces directly from the master cylinder housing to the vehicle bulkhead between which the booster is mounted. This enables a housing of lighter weight, such as a plastics housing, to be employed, and an overall savings in weight is achieved. The front or rear housing wall, or both, are provided with a sleeve that encases part of the tie within the housing. The sleeve may perform various functions: it may be keyed to the tie to resist turning, it may be arranged to support a rolling diaphragm sealing the tie to the movable wall, and its free end may locate a peripheral bead on the rolling diaphragm.
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