JPH0637039U - Solenoid valve for anti-lock brake system device - Google Patents

Abstract

(57) [Abstract] [Purpose] Responsiveness is not impaired during normal brake operation, and the throttle portion changes due to the differential pressure between the M / C side and the W / C side when the valve is opened to increase pressure. ABS that can suppress vibration and noise generation due to sudden pressure increase
Providing solenoid valves for equipment. [Constitution] With the valve member (4) open, the M / C side and the W / C side
A means (13, 13) for providing a main liquid passage (11) communicating with the side and for varying the throttled state of the main liquid passage (11) by the pressure difference between the M / C side and the W / C side when the valve is opened. 13A,
A solenoid valve (1) for an ABS device, which is provided with 13B, 14, 15).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve for an antilock brake system (ABS) device, and more specifically, it is usually provided in a main fluid passage between a master cylinder (M / C) and a wheel cylinder (W / C) of an ABS device. The present invention relates to a solenoid valve for increasing pressure.

[0002]

[Prior art]

 As a conventional solenoid valve of this type, for example, a solenoid valve described in the manual for the new model of Toyota Starlet (issued in February 1989) is known. This type has a fixed throttle in the main fluid passage that connects to the master cylinder side port, and is kept open by demagnetizing the solenoid during normal braking operation and closed when the hydraulic pressure on the W / C side is maintained. It is configured to be valved.

[0003]

[Problems to be solved by the device]

 However, in such a conventional solenoid valve for an ABS device, the throttle portion provided in the main fluid passage prevents the hydraulic pressure transmitted from the master cylinder side to the wheel cylinder side to suddenly rise. Although the effect can be obtained, there is a problem that the responsiveness due to the brake operation is impaired because the brake fluid flowing through the main fluid passage is restricted by the throttle even during normal brake operation.

The object of the present invention is to solve such a conventional problem by incorporating a variable throttle means in the valve member itself of the solenoid valve, instead of providing a throttle portion fixed in the main fluid passage, thereby forming a master cylinder. The throttle state is adjusted appropriately according to the difference in hydraulic pressure between the wheel side and the wheel cylinder side, and the change in hydraulic pressure is transmitted rapidly without increasing the responsiveness during normal braking. An object of the present invention is to provide a solenoid valve for an ABS device that does not generate vibration or noise due to surge pressure generated by the surge pressure.

[0005]

In order to achieve such an object, the present invention is arranged in a fluid passage between a master cylinder and a wheel cylinder, and connects or disconnects the fluid passage by deenergizing a solenoid. In a solenoid valve for an anti-lock brake system device including a valve member, a main fluid passage that connects the master cylinder side and the wheel cylinder side in a valve open state is provided in the valve member, and the master cylinder is opened when the valve is opened. The present invention is characterized in that a throttle variable means for varying the throttle state of the main fluid passage is provided according to the difference in hydraulic pressure between the side of the wheel cylinder and the side of the wheel cylinder.

[0006]

[Action]

 According to the present invention, when the master cylinder side and the wheel cylinder side fluid passages communicate with each other through the main fluid passage provided in the valve member in the valve open state, normal brake operation is performed, and ABS control In this case, the valve is closed to keep the brake fluid pressure constant, but when the valve is opened by demagnetizing the solenoid to re-increase the pressure, the throttle variable means is used on the master cylinder side and the wheel cylinder side. Since the throttle state of the main fluid passage is changed by the difference in the hydraulic pressure between the pressure and the pressure, it is possible to gradually increase the pressure so that the differential pressure is gradually eliminated. It is possible to suppress the generation of noise and vibration based on the generation and surge pressure.

[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 for increasing pressure according to the present invention, 2 is its valve housing, 3 is a solenoid for driving a valve arranged around the valve housing 2, 4 is a valve member, and 4A is its movable core. , 4B is a valve rod portion, 4C is a spherical valve element provided at the tip of the valve rod portion 4B, 4D is extended to the wheel cylinder side port 5 of the valve member 4, and the bearing member 6 for centering is provided. The protruding shaft is slidably supported by. Further, 7 is a valve seat provided on the master cylinder side port 8, 9 is a bearing member that slidably supports the valve rod portion 4B, and 10 is a main fluid passage 11 between the bearing member 9 and the valve member 4. It is a return spring that is arranged along the line and keeps the valve member 4 open.

Furthermore, the valve member 4 of the present example is provided with an inner cylinder portion 12 communicating with the main liquid passage 11 between the movable iron core portion 4A and the valve rod portion 4B. Further, a slidable sliding member 13 for changing the diaphragm is installed. Reference numeral 14 is a biasing spring that biases the sliding member 13 toward the stopper 15, and 16 is a stroke restricting member that restricts upward movement of the sliding member 13 in the inner tubular portion 12. FIG. 2 shows the structure around the sliding member 13. As shown in FIG. 2, the sliding member 13 is a radial main liquid passage (hereinafter referred to as a first throttle passage) formed in the valve member 4 itself. A main liquid passage 11 and a radial second throttle passage 13A having a cross-sectional area corresponding to the passage 11A are provided at a position facing 11A. Further, 13B is a main communication passage along the axial direction for communicating this passage 13A with the main liquid passage 11 on the W / C side and the M / C side. On the other hand, the stopper 15 is also provided with an axial main communication passage 15A corresponding to the main communication passage 13B.

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

Now, when the normal brake operation is not performed or the valve is closed by ABS, the hydraulic pressure in the W / C side port 5 and the main fluid passage 11 around the return spring 10 is the main fluid passage 11, The first throttle passage 11A, the second throttle passage 13A, and the main communication passage 13B communicate with each other to maintain a constant pressure. In this case, the W / C side and the M / C side are slightly communicated with each other through the circumferential gap 20 between the movable iron core portion 4A and the valve housing 2, but here, due to this gap 20 It is assumed that the cross-sectional area of the passage formed through the main liquid passage 11 described above is sufficiently larger than the cross-sectional area of the passage. In the above-mentioned equal pressure state, the sliding member 13 is kept in a state of being biased by the stopper 15 by the spring force of the biasing spring 14 as shown in FIGS. The first throttle passage 11A in the radial direction is kept open toward the inner cylindrical portion 12.

Now, from the valve open state as shown in FIG. 1 or 2 to the valve closed state by the ABS control, and further from the valve closed state to depressurize the solenoid 3 to re-pressurize, the valve member 4 opens. When the valve operation is performed, a high hydraulic pressure on the M 2 / C side is transmitted to the main fluid passage 11 around the return spring 10, and the fluid pressure causes the sliding member 13, which is a component of the throttle varying means, to move to the inner cylinder. It is moved upward in the part 12. FIG. 3 shows the operation during such valve opening. The movement of the sliding member 13 causes the closing portion 13C (see FIG. 2) formed above the second throttle passage 13A of the sliding member 13 to squeeze a part of the first throttle passage 11A. Therefore, since the brake liquid that tries to flow through the main liquid passage 11 is regulated, the transmission of the M / C side high pressure when the valve is opened is slowed down.

The axial height L1 of the first throttle passage 11A is set to be slightly larger than the axial height L2 of the closing portion 13C of the sliding member 13. Therefore, the first throttle passage 11A is not completely blocked by the closing portion 13C in any stroke of the sliding member 13 to be described below after the state shown in FIG. Thus, it is possible to prevent the main liquid passage 11 from being suddenly and completely blocked.

Then, even if there is a difference in the hydraulic pressure between the M / C side and the W / C side even in the state of FIG. 3, the sliding member 13 moves upward as shown in FIG. The first throttle passage 11A is moved until it comes into contact with the regulating member 16, and is gradually narrowed in the process, and then gradually released, and in the contact state described above, the first throttle passage 11A and the second throttle passage 13A. The aperture is canceled when and match. As described above, as long as the differential pressure exists between the hydraulic pressure on the M / C side and the hydraulic pressure on the W / C side, and the hydraulic pressure on the M / C side is large, the solenoid valve 1 opens its valve. In the case where the main liquid passage 11 is throttled by the sliding member 13 incorporated in the valve member 4 according to the differential pressure, the hydraulic pressure on the M / C side is rapidly transmitted to the W / C side. Surge pressure can be prevented.

[0015]

As described above, according to the present invention, the valve member is provided with the main fluid passage that allows the master cylinder side and the wheel cylinder side to communicate with each other in the open state, and the master fluid passage is opened when the master fluid passage is opened. Since the throttle variable means for varying the throttle state of the main fluid passage is provided according to the difference in hydraulic pressure between the cylinder side and the wheel cylinder side, at least the closed state by the ABS control of the solenoid valve which is kept normally open is maintained. When the valve is opened to increase pressure, the hydraulic pressure on the M / C side is not rapidly transmitted to the W / C side due to the throttle formed by the movement of the sliding member, and gradually increases to the W / C side. It is possible to prevent the surge pressure from being generated on the W / C side, and to suppress the vibration of the piping that accompanies this, which may cause noise and discomfort to the brake operator. Can be prevented, It is possible to maintain the responsiveness during normal brake operation without impairing the responsiveness.

[0016]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention in a normal brake operating state.

FIG. 2 is an explanatory view showing an enlarged configuration of a sliding member according to the present invention.

FIG. 3 is a sectional view showing the operation of the sliding member according to the present invention in the initial state of valve opening.

FIG. 4 is a cross-sectional view showing an operation of the sliding member according to the present invention in a state in which the stroke is further advanced.

[Explanation of symbols] 1 solenoid valve 2 valve housing 3 solenoid 4 valve member 4A movable iron core 4B valve rod 4C valve body 5 W / C side port 7 valve seat 8 M / C side port 10 return spring 11 main fluid passage 11A No. 1 Throttle Passage 12 Inner Tube 13 Sliding Member 13A Second Throttle Passage 14 Bias Spring 15 Stopper 15A Main Communication Passage 16 Stroke Restricting Member 20 Clearance

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic valve for an anti-lock brake system device, comprising a valve member which is disposed in a fluid passage between a master cylinder and a wheel cylinder and which connects or disconnects the fluid passage by deenergizing a solenoid, The valve member is provided with a main fluid passage that connects the master cylinder side and the wheel cylinder side in the valve open state,
An electromagnetic valve for an anti-lock brake system device, characterized by comprising throttle variable means for varying the throttle state of the main fluid passage depending on the hydraulic pressure difference between the master cylinder side and the wheel cylinder side when the valve is opened. .