| 摘要 |
A vacuum-type brake booster device for automotive use having a shape such that the mounting of the booster device and surrounding components inside the engine compartment of the vehicle is markedly eased. The shell of the booster device, and hence the diaphragm contained therein, has the shape in the plane of the diaphragm of a circle having a peripheral segment thereof removed. This causes the effective center of the diaphragm to be shifted from the center of the circle. The input and output shafts and the master cylinder are mounted on the shell aligned with the offset effective center of the diaphragm.
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