JPH0637038U - Solenoid valve of antilock brake system equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] When the valve opening operation for increasing pressure is performed, stable operation of the brake pedal is guaranteed by controlling the valve opening speed, and noise generation is prevented. Provided is a solenoid valve of an anti-lock brake system device that can be used. In a normally open solenoid valve (1) of an ABS device, the valve member (2) is kept slidable in the valve member operating direction while maintaining contact with the valve opening end of the valve member (2). A valve opening speed regulating member (spool member 3) capable of suppressing the valve opening speed of the valve member (2) at the time of opening the valve is featured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve of an antilock brake system (ABS) device, and more particularly, to a normally open solenoid valve provided for increasing the pressure of an ABS device.

[0002]

[Prior art]

 As a conventional solenoid valve of this type, for example, there is one disclosed in Japanese Utility Model Publication No. 58-17169. This invention relates to a solenoid valve having three ports or four ports suitable for an ABS device. It has a constant pressure phase that shuts off the pressure increasing passage to keep the pressure of the brake fluid constant, and a pressure increasing passage through the pressure increasing passage. It is configured so that it can be switched between the phase that increases and decreases the pressure, and is normally open during normal brake operation and closed by energization.

[0003]

[Problems to be solved by the device]

 However, in the conventional solenoid valve for the ABS device as described above, the valve is closed by the excitation of the solenoid, and the pressure on the wheel cylinder (W / C) side is kept constant. When the solenoid is demagnetized for a short period of time to open the valve, the M / C side that was kept at high pressure in this state communicates with the W / C side that was kept at low pressure. Therefore, there was a problem that the surge pressure generated by the rapid pressure change on the M / C side being transmitted to the W / C side caused a sudden reaction of the brake pedal and noise due to vibration of the brake pipe. .

The object of the present invention is to pay attention to such a conventional problem, and in order to solve the problem, when the valve opening operation for increasing the pressure is performed from the valve closed state, the valve opening speed is regulated. Accordingly, it is an object of the present invention to provide a solenoid valve for an ABS device which ensures stable operation of the brake pedal and can prevent the generation of noise.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention has a slidable valve member which is kept open by demagnetizing a solenoid, and in the valve open state, a port between the master cylinder side and the wheel cylinder side is opened. In an electromagnetic valve of an anti-lock brake system device that is communicated, it has a biasing force in the valve closing direction of the valve member and slides in the valve operating direction while maintaining contact with the valve opening direction end of the valve member. It is characterized in that it is provided with a valve-opening speed regulating member which can be kept freely and can suppress the valve-opening speed of the valve member when the valve is opened by demagnetizing the solenoid from the closed state.

[0006]

[Action]

 According to the present invention, when the valve is opened due to the demagnetization of the solenoid, the valve opening speed regulating member that is slidable in the valve member operating direction while maintaining contact with the valve opening direction end of the valve member resists the biasing force. The valve opening speed can be controlled by such an operation of the valve opening speed control member by interlocking with the valve opening direction of the valve member. For example, the brake fluid pressure on the master cylinder side can be changed to the wheel cylinder side. Even if the solenoid valve is opened to increase the pressure when the hydraulic pressure is higher than the hydraulic pressure of the master cylinder, the high hydraulic pressure on the master cylinder side will not be suddenly transmitted to the wheel cylinder side. It is possible to prevent the occurrence of noise caused by the reaction to the pedal and the vibration of the pipe.

[0007]

【Example】

 Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Here, 1 is a solenoid valve according to the present invention, and in this example, the open state thereof is shown. 2 is the valve member, 2A is the movable core of the valve member 2, 2B is the valve stem, 2C is a hemispherical valve element provided at the tip of the valve stem 2B, and 2D is from the movable core 2A. It is a protruding shaft portion that extends upward in this figure along the axis of the valve member and is kept in contact with the end portion of the spool member 3 according to the present invention. Further, 4 is a buffer spring that biases the spool member 3 toward the protruding shaft portion 2D of the valve member 2, 5 is a return spring that keeps the valve member 2 in the open state shown in the figure, and 6 is an inside of the solenoid valve housing 7. Is a solenoid held by.

The spring force of the buffer spring 4 is set to be weaker than that of the return spring 5, and the valve member 2 is kept open by the spring force overcome by the return spring 5. 8 is an M / C side port of the valve member 1, 9 is a W / C side port, 10 is a spool guide that keeps the spool member 3 in a sliding condition, and 11 is a buffer spring that is assembled integrally with the spool guide 10. 4 is a spool holding body which is held in the housing 7 while being held therein, and 12 is an air vent port which communicates with the buffer chamber 11A of the spool holding body.

Next, the operation of the solenoid valve 1 having the above-described structure when opening and closing the valve will be described.

During normal brake operation, as described above, the spring force of the return spring 5 is sufficiently stronger than the spring force of the buffer spring 4, and the difference between the spring forces keeps the valve open. The spool member 3 is in contact with the protruding shaft portion 2D of the valve member 2 by the spring force of the buffer spring 4. In the main liquid passage of the solenoid valve 1 in the valve open state, the M / C side port 8 and the W / C side port 9 are communicated with each other through a clearance passage formed around the valve member 2, Brake fluid pressure is maintained evenly.

Next, when the solenoid 6 is energized and excited by the operation of the ABS device, the movable iron core portion 2A of the valve member 2 is attracted by the solenoid 6 to move downward in the figure, and the valve body 2C is By contacting the valve seat 13, the valve is closed. Further, at this time, the spool member 3 follows the operation of the valve member 2 and moves downward to maintain the state in which the spool member 3 is in contact with the protruding shaft portion 2D.

Next, when the solenoid 6 is excited to increase the pressure in the above-mentioned valve closed state, the differential pressure between the hydraulic pressure at the port 8 on the M / C side and the hydraulic pressure at the port 9 on the W / C side and The spring force of the return spring 5 acts to move the valve member 2 upward to open the valve. However, the spool member 3 is biased toward the protruding shaft portion 2D of the valve member 2 by the spring force of the buffer spring 4. Therefore, the compression of the spring 4 causes a difference with the spring force due to the expansion of the return spring 5 to tend to delay the valve opening speed of the valve member 2, and the upward movement of the spool member 3 causes the brake fluid on the main fluid passage side. Since resistance is required to pass through the gap between the spool member 3 and the spool guide 10, the rise in the hydraulic pressure of the W / C side port 9 is moderated and the generation of surge pressure can be suppressed.

[0014]

[Effect of device]

 As described above, according to the present invention, there is a slidable valve member that is kept open by demagnetizing the solenoid, and between the ports on the master cylinder side and the wheel cylinder side in the valve open state. In the electromagnetic valve of the anti-lock brake system device in which the valve member communicates with the valve member, there is a biasing force in the valve closing direction of the valve member, and in the operating direction of the valve member while maintaining contact with the valve opening direction end of the valve member. The valve is equipped with a valve-opening speed regulating member that keeps it slidable and can suppress the valve-opening speed of the valve member when the valve is opened by demagnetizing the solenoid from the closed state. When this happens, the surge pressure caused by the sudden release of the differential pressure between the M / C side and the W / C side causes the operator of the brake pedal to feel an unpleasant reaction, and noise due to pipe vibration is generated. It is possible to prevent , Always it is possible to perform the stable braking operation.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

 1 Solenoid valve 2 Valve member 2A Movable iron core part 2C Valve body 2D Projecting shaft part 3 Spool member 4 Buffer spring 5 Return spring 6 Solenoid 8, 9 port 10 Spool guide 13 Valve seat

Claims (1)

[Scope of utility model registration request] 1. An anti-lock brake system having a slidable valve member which is kept open by demagnetizing a solenoid, and in which the ports on the master cylinder side and the wheel cylinder side communicate with each other in the valve open state. In a solenoid valve of a device, the valve member has a biasing force in a valve closing direction, is kept slidable in an operating direction of the valve member while maintaining contact with an end portion of the valve member in a valve opening direction, and is closed. An electromagnetic valve for an anti-lock brake system device, comprising: a valve opening speed regulating member capable of suppressing a valve opening speed of the valve member when the valve is opened by demagnetizing the solenoid from a state.