Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2006-09-12
2006-09-12
Kershteyn, Igor (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
C060S554000, C060S562000, C091S422000
Reexamination Certificate
active
07104058
ABSTRACT:
In a vehicle braking system, a backup piston pushes a master piston directly from behind when hydraulic pressure of a boosted hydraulic pressure chamber decreases. The backup piston has a piston body which is slidably fitted in a casing, and a pusher which is slidably fitted in the casing with a seal diameter smaller than seal diameters of the master piston and the piston body and which extends to the front end of the piston body, to push the master piston from behind. An annular input chamber communicated with a hydraulic power source is formed between the backup piston and the casing. When the pusher pushes the master piston forward, amount of volume increased in the boosted hydraulic pressure chamber is set to be substantially equal to amount of volume decreased in the input chamber. Thus, it is possible to avoid increase in the hydraulic pressure of the boosted hydraulic pressure chamber during forward movement of the backup piston, using a simple configuration with a reduced number of parts.
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Aoki Yasushi
Matsuno Isao
Suzuki Kenji
Tagata Kazuhiro
Arent & Fox PLLC
Kershteyn Igor
Nissin Kogyo Co. Ltd.
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