Sumitomo Electric Industries, Limited

Tsuyoshi Fujimoto

Teruhisa Kohno

Koichi Hashida

Koji Takata

Seiji Nokubo

Keiichi Ohnishi

An apparatus, for controlling the pressure of braking-fluid, provided in a circuit for controlling the pressure thereof comprising: a solenoid valve, having a pressure receiving portion fluid-tightly inserted into a housing and an electromagnetic coil, for controlling the pressure of the braking fluid by opening and closing a valve ball communicating with the pressure receiving portion; and holding portion for holding the solenoid valve on the housing against fluid pressure acting on the pressure receiving portion. In this construction, the holding portion is made of a magnetic material and constitutes a part of the electromagnetic path of the solenoid valve.

Holding apparatus for a solenoid valve controlling brake pressure

A fluid pressure control unit has a changeover valve and an electromagnetic discharge valve combined with each other so that with the opening and closing of the latter valve, the communication between the inlet leading to the pressure source and the first and second outlets leading to wheel brakes is changed over for normal braking, pressure reduction for antilock control and pressure reincrease. Part of the sleeve of the changeover valve is used as the frame of the discharge valve which functions as a magnetic circuit. This reduces the number of parts, eliminates the need for an O-ring and facilitates maintenance.

Fluid pressure control device having changeover and electromagnetic

A brake fluid pressure control apparatus has a solenoid valve and/or other fluid pressure control elements in a housing, and the reactive force resulting from the fluid pressure acting on the fluid pressure control elements is carried by a support member fastened to the housing. The support member is a flat plate member. Mounting tabs are formed integrally to and on the same plane as the support member, projecting outwardly from the ends thereof. The mounting tabs are each fastened to the bracket of the vehicle body through a rubber bushing and mounting case. Thus, the structure used to fasten the control apparatus to the vehicle body is simplified and the number of parts required for installation is reduced.

Brake fluid pressure control apparatus

A brake fluid pressure control device is provided, and includes a main flow path for connecting, as one system, first and second wheel brakes with a master cylinder, a first reservoir, a fluid pressure adjusting member for selectively enabling the first and second wheel brakes to communicate with the master cylinder and the first reservoir, a pump for pressurizing brake fluid in the first reservoir so as to discharge the brake fluid to a junction of the main flow path and the pump. A second reservoir which is in communication with the fluid pressure adjusting member and the second wheel brake and, a directional control valve which is adapted, in a first state, to enable the master cylinder and the fluid pressure adjusting member to communicate with each other and in a second state to interrupt communication between the master cylinder and the fluid pressure adjusting member are also provided. A control unit is also provided which, at the time of traction control, sets the directional control valve to the second state and drives the pump so as to supply the brake fluid in the second reservoir to the first wheel brake through the fluid pressure adjusting member.

Brake fluid pressure control device

A braking fluid pressure control apparatus is provided including a master cylinder driven by force applied to a brake pedal for generating braking hydraulic pressure; an auxiliary power unit sucking fluid from a reservoir and pressurizing the fluid so as to store the fluid as an auxiliary power source; a booster having a boost chamber for generating boost pressure proportional to force applied to the brake pedal in the boost chamber in receipt of pressure supplied from the auxiliary power unit so that the thrust of the master cylinder is increased by the boost pressure generated by the force applied to the brake pedal and the boost pressure is used as braking pressure. A pressurizing unit housing is provided with a large-diameter opening and a small-diameter opening arranged in series. A first piston is provided which is slidably inserted into the small diameter opening and fluid-sealing the small-diameter opening so as to separate a first cylinder chamber and a second cylinder chamber from each other. A second piston slidably is inserted into the large-diameter opening so as to separate the second cylinder chamber and a third cylinder chamber form each other. A spring is provided for urging the second piston toward the second cylinder chamber and for opening and closing a port. The apparatus permits brakes to operate effectively even if a problem exists in the boost pressure line.

Braking fluid pressure control apparatus

A brake system has a manually controlled brake pressure generator, independent controlled brake circuits each having a wheel brake and a flow control valve for electronically controlling the pressure of the wheel brake, a dynamic pressure source necessary for the pressure control by the flow control valve, a reservoir, a sensor such as a wheel speed sensor, and an electronic control unit. A pair of check valves for introducing and returning fluid are provided in parallel to each other between an output circuit of the brake pressure generator and each controlled brake circuit. A solenoid changeover valve for antilock is provided between the output circuit of the brake pressure generator and the check valves for introducing fluid to close the line during antilock control.

Growing community of inventors

Itami, Japan

Tsuyoshi Fujimoto