| 摘要 |
PURPOSE: A hydraulic pressure control device of brake fluid is provided to improve the stability by supplying brake pressure to a wheel cylinder properly with sharing brake fluid by communicating middle pressure accumulators. CONSTITUTION: A brake pressure control device is composed of a master cylinder(53); wheel cylinders(70a-70d) providing braking force according to hydraulic pressure of brake fluid; inlet and outlet valves(55a-55d,56a-56d) formed in inlets and outlets of wheel cylinders to regulate flow of brake fluid; hydraulic pumps(58a,58b) sucking and discharging brake fluid to wheel cylinders; bypass passages(61a,61b) bypassing discharge pressure from discharge ports of hydraulic pumps to intake ports of hydraulic pumps; middle pressure accumulators(62a) formed in bypass passages for accumulating brake pressure; an electronic control unit regulating brake pressure transmitted to the wheel cylinders; a connecting passage(67) communicating bypass passages; and a valve unit(68) formed in the connecting passage to share or shut off brake fluid between middle pressure accumulators. The stability is improved by supplying brake pressure to the wheel cylinder optimally with sharing brake fluid between middle pressure accumulators.
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