| 摘要 |
PROBLEM TO BE SOLVED: To allow automatic pressurization control at low cost in a brake hydraulic pressure control device formed with an input-side hydraulic pressure passage capable of being communicated with a master cylinder, a pump with its discharge side connected to the input-side hydraulic pressure passage, a release-side hydraulic pressure passage connected to the intake side of the pump, a control valve means switching the communication and the cutoff of a wheel brake relative to the input-side hydraulic pressure passage and the release-side hydraulic pressure passage, and an ABS reservoir connected to the release-side hydraulic pressure passage. SOLUTION: Reservoirs 14A, 14B for automatic pressurization control are connected to the release-side hydraulic pressure passages 6A, 6B. When the discharge pressure of the pumps 3A, 3B becomes higher by specified pressure or more than the output pressure of the master cylinder M by differential pressure switching valves 18A, 18B operating according to the difference between the discharge pressure of the pumps 3A, 3B and the output pressure of the master cylinder M, output ports 1A, 1B of the master cylinder M and the release side hydraulic pressure passages 6A, 6B are communicated, and the output ports 1A, 1B and the input side hydraulic pressure passages 2A, 2B are cut off. COPYRIGHT: (C)2005,JPO&NCIPI
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