| 摘要 |
PURPOSE:To introduce the atmospheric air into two variable pressure chambers through a conventional valve mechanism when a braking force assistor device with the input shaft advance is in operation, and introduce the atmospheric air to the two chambers via communication lines. CONSTITUTION:Communication lines 31b, 18a, 7b are provided for an input shaft 31, valve plunger 18, and valve body 7, respectively, and when the input shaft 31 is advanced to put a valve mechanism 15 into operation the communication line 18a of the valve plunger 18 is put in communication with the communication line 7b of the valve body 7. Thereby, the flow path area when the atmospheric air is to be introduced can be enlarged by an amount corresponding to provision of the communication lines 31b, 18a, 7b, so that the responsiveness when a braking force assistor device is in operation can be improved compared with a conventional arrangement. |
