Patent ID: 7500725

Claim:
A hydraulic braking pressure control unit comprising: a plurality of electromagnetically operated hydraulic pressure control valves capable of controlling pressure of a working fluid in a plurality of brake cylinders; a power-operated hydraulic pressure source power-operable to pressurize the working fluid, and including a pump device having a pump operable to pressurize the working fluid received from a low-pressure source and deliver the pressurized working fluid, and an accumulator for storing the pressurized working fluid delivered from the pump device; a master-cylinder pressure sensor operable to detect a pressure of the working fluid pressurized by a master cylinder; an accumulator pressure sensor operable to detect a pressure of the working fluid stored in said accumulator; and a holder structure which holds said plurality of electromagnetically operated hydraulic pressure control valves, wherein said plurality of electromagnetically hydraulic pressure control valves include four control valves having respective main body portions which are arranged along a straight line on one surface of said holder structure and which are four pressure-increasing control valves connected to said power-operated hydraulic pressure source and to the respective four brake cylinders or four pressure-reducing control valves connected to said low-pressure source and to said respective four brake cylinders, and said holder structure has a delivery passage which is connected to said power-operated hydraulic pressure source and through which the pressurized working fluid is delivered from said pump device, and at least one master-cylinder passage connected to the master cylinder manually operable to pressurize the working fluid, each of said pressure-source passage and said at least one master-cylinder passage being formed in said holder structure, so as to extend in a direction intersecting said straight line, between two adjacent ones of said plurality of control valves, as seen in a plane of said one surface, and further wherein said holder structure holds all of said plurality of electromagnetically operated hydraulic pressure control valves, said master-cylinder pressure sensor and said accumulator pressure sensor such that the main body portions of the electromagnetically operated hydraulic pressure control valves, master-cylinder pressure sensor and accumulator pressure sensor are attached to said one surface.