| 摘要 |
The present invention is directed to a master cylinder having a braking stroke simulator, wherein a master piston is slidably accommodated in a housing having an atmospheric pressure chamber and a master pressure chamber, and a simulator piston is slidably accommodated in the housing to define a simulator chamber. An elastic member is provided for applying a stroke of the simulator piston in response to braking operation force applied to a manually operated braking member. Thus, the braking stroke simulator transmits the braking operation force to the master piston through the simulator piston and elastic member. A cut-off seal member is disposed in the housing for supporting the master piston, and placed to be applied with the pressure in the master pressure chamber in front of it and applied with the atmospheric pressure behind it. And, a passage is formed in the master piston to communicate the simulator chamber with the atmospheric pressure chamber when the master piston is placed in its initial position. The cut-off seal member is positioned relative to the passage to block the communication between the simulator chamber and the atmospheric pressure chamber, when the master piston is advanced by a predetermined stroke from the initial position.
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