KR100726555B1 - Brake oil flux control typed solenoid valve - Google Patents

Abstract

A solenoid valve for regulating a flow of brake oil is provided to quickly supply and recollect oil by forming a flow path of the brake oil between a master cylinder and a brake mechanism through the solenoid valve and to shorten the response time. A solenoid valve for regulating a flow of brake oil comprises a plunger(2), a valve body(3), and a spool(11). The plunger is operated by a coil body(1) excited by supplied electric power according to control signals of a control unit. The valve body has a path forming body(5), a narrow connecting unit(7), a check valve hole(9), and a check valve(10). The path forming body is integrally connected with an extension body(4) inserting the plunger inside through a plunger hole(6a) by press-fitting into a modulator block(A). The narrow connecting unit is formed at the path forming body with a path hole(8) communicated with a chamber(6b) inflowing oil pressure. Two check valve holes are formed at the chamber of the path forming body to be communicated circumferentially. The check valve operates the recollected oil pressure only toward the chamber. The spool has a path forming body(11a), an extension contact step(11c), a path hole(11d), and a spring(11e). The path forming body is inserted into the chamber of the valve body to shape a chamber(11b) receiving oil pressure. The extension contact step is projected on an end of the path forming body and formed spherical to be tightly contacted with a spherical contact step(2a) of the plunger. The path hole is connected to a smaller diameter than the chamber of the path forming body to be opened to the extension contact step. The spring is supported by the extension contact step on one end and supported by the plunger on the other end.

Description

Brake oil flux control typed solenoid valve

1 is a diagram illustrating an internal configuration of a solenoid valve for flow control of a brake oil according to the present invention.

2 is a hydraulic flow chart when supplying brake oil through a solenoid valve according to the present invention.

Figure 3 is a hydraulic flow diagram when the brake oil return through the solenoid valve according to the present invention

    <Description of the symbols for the main parts of the drawings>

1: coil body 2: plunger

2a: contact end 3: valve body

4: extension body 5,11a: flow path forming body

6a: Plunger hole 6b, 11b: chamber

7: Narrow connection part 8,11d: Euro hole

9: Check valve hole 10: Check valve

11: Spool 11c: Extension contact end

11e: spring

A: Modulator block B: Brake mechanism

M: Master cylinder P: Brake pedal

The present invention relates to a solenoid valve for a vehicle, and more particularly, to a solenoid valve for controlling a brake oil flow, which is capable of quickly returning brake oil when braking is released.

In general, a braking system for braking a vehicle using hydraulic pressure that boosts the driver's brake pedal operation force provides an optimum braking performance according to the driving condition and road conditions of the vehicle due to a simple method of grabbing a rotating wheel and preventing the vehicle from turning. It will not be implemented.

In order to overcome the limitation of the simple braking system, the anti-lock brake system prevents the wheel from locking by appropriately adjusting the braking pressure applied to the wheel according to the slip ratio calculated from the wheel speed. Or by using a traction control system that adjusts the driving force of the engine to prevent excessive slip during rapid start or rapid acceleration of the vehicle.

However, such an anti-lock brake system or a transaction control system also shows good performance when driving on straight roads. Unreliable oversteer over tilting outward or over steer overturning inward inwards, resulting in unreliable vehicle stability.

Accordingly, in recent years, all three types of braking, driving, and steering systems have been considered, that is, oversteer (i.e., oversteer) according to measurement signals input from a wheel speed sensor, a yaw rate sensor, a lateral acceleration sensor, and a steering angle sensor. By determining oversteer or understeer and controlling it comprehensively, it minimizes the difference between the driving direction required by the driver and the driving direction of the actual vehicle, and keeps the driving direction of the vehicle safely intended by the driver under any driving conditions. ESP (Electronic Stability Program) system is being applied.

In the case of such an ESP system, an independent vehicle rotation (for example, pumping oil from the master cylinder to provide a braking pressure toward the wheel) is provided separately from the brake line for supplying the braking hydraulic pressure between the master cylinder and the wheel. For example, in the case of an ice path), a solenoid valve (commonly referred to as a high pressure shuttle valve (HSV)) is used to form an oil flow path between the master cylinder and the pump. do.

That is, if the rear wheel first reaches the adhesive limit between the tire and the road surface, or if excessive turning force is applied to the front wheel outside the turning, the oversteer phenomenon that the vehicle steer is more severe than the steering angle manipulated by the driver appears. In addition, the ESP controls the front wheel brake to reduce excessive turning moments generated by the front wheels.

In addition, if the front wheel first reaches the adhesive limit between the tire and the road surface, or if excessive turning force is applied to the turning rear wheels, an understeer phenomenon occurs in which the vehicle is steered less than the steering angle manipulated by the driver. By controlling appropriately, the driver controls the vehicle in a desired direction to improve stability and steering.

However, for this ESP action, the brake oil flow between the master cylinder and the brake mechanism mounted on the wheel, that is, the oil supply and return action, must be made very quickly. It is essential to develop a solenoid valve with oil drainage, and the performance of such a solenoid valve will influence the overall performance improvement.

Accordingly, the present invention has been made in view of the above, and an object thereof is to provide a quick response for performing a rapid oil supply and return to a solenoid valve forming a flow path of brake oil between a master cylinder and a brake mechanism. have.

In the present invention for achieving the above object, in the solenoid valve for supplying the brake hydraulic pressure of the master cylinder to the brake mechanism through a booster for boosting the pedal pedal effort,

A plunger operated by a coil body which is supplied with power and excited according to a control signal of a control device for brake action;
A narrow connection portion having a flow path forming body integrally connected to an extension body into which the plunger is inserted through the plunger hole and being formed into the modulator block, and a flow path formed in the flow path forming body and communicating with a chamber into which hydraulic pressure flows; A valve body consisting of two valves which are provided at two opposite positions to the valve valve holes circumferentially communicating with the chamber of the flow path forming body and acting only toward the chamber when the hydraulic pressure is returned;
A flow path forming body inserted into the chamber formed in the valve body to form a chamber in which hydraulic pressure is applied; an extension contact end formed in a spherical shape to protrude from an end of the flow path forming body and to be in close contact with a spherical contact end of the plunger; A spool made of a passage hole opening to an extended contact end while having a diameter smaller than that of a chamber formed in the forming body, and a spring supported at one end to the extended contact end and supported at one end to the plunger;
Characterized in that consisting of.

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Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the internal configuration of the brake oil flow control solenoid valve according to the present invention, the present invention is a brake braking hydraulic pressure generated in the master cylinder (M) through a booster for boosting the pedal force of the brake pedal (P) Solenoid valve for supplying air to the brake mechanism (B)

Plunger 2 which is supported by a spring while being energized in response to a control signal of a control device and actuated by a coil body 1 excited to form a spherical contact end 2a at the end to open and close the flow path. And a valve body (3) and a valve body (3) having a flow path press-fitted into the modulator block (A) to form an oil flow passage between the brake braking hydraulic line formed between the master cylinder (M) and the brake mechanism (B). It is made of a spool (11) for switching the flow passage by opening and closing the flow path while being moved through the hydraulic pressure flowing into the received.

Here, the valve body (3) is fixed to the housing surrounding the coil body (1) and pressed into the modulator block (A) and the extension body (4) inserting the plunger (2) through the plunger hole (6a), and A flow path forming body (5) having a flow path for switching hydraulic flow in the modulator block (A), which is formed integrally with the extension body (4) and forms a flow path leading between the master cylinder (M) and the brake mechanism (B). The flow passage communicating with the chamber 6b formed in the flow passage forming body 5 with a diameter larger than the plunger hole 6a so that the spool 11 is received from the extension body 4 to the portion leading to the flow passage forming body 5. 첵 valve which is provided in the narrow valve 7 having the hole 8 and the 첵 valve hole 9 communicating with the chamber 6b of the flow path forming body 5 so that the hydraulic pressure flows only into the chamber 6b. 10).

At this time, the flow path forming body 5 is provided with two or more check valve (10).

In addition, the spool 11 has a flow path forming body 11a inserted into the chamber 6b formed in the flow path forming body 5 and a small diameter protruding from the end of the flow path forming body 11a to the plunger 2. 11 d of contact holes 2a of which the spherical contact ends 2a are in close contact with each other, and a passage hole 11d opened to the extension contact ends 11c while having a smaller diameter than the chamber 11b formed in the flow path forming body 11a. ) And a spring 11e having one end supported by the extended contact end 11c and one end supported by the plunger 2.

Here, the portion of the plunger 2 on which the spring 11e is supported is inserted into the spring 11e with a relatively small diameter compared to the portion located on the coil body 1 portion.

Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.

The present invention prevents the deterioration of stability due to the oversteer or understeer phenomenon generated on the wheels on slippery roads such as sudden turning of the vehicle or the icy road, that is, even when the driver does not operate the brakes. Based on the signals from several sensors, the ESP operates to maintain driving stability even in unexpected situations.

In this way, in the brake braking hydraulic circuit formed between the master cylinder M and the brake mechanism B during brake braking, the hydraulic pressure supplied from the master cylinder M to the brake mechanism B is again supplied from the brake mechanism B to the master cylinder. When forming the hydraulic flow returning to (M), the solenoid valve provided in the modulator block (A) is acted to achieve a rapid return flow.

That is, when brake braking hydraulic pressure is supplied from the master cylinder M to the brake mechanism B, the hydraulic pressure is supplied from the master cylinder M to the solenoid valve provided in the modulator block A as shown in FIG. Then, while flowing into the chamber (6b) of the valve body (3) constituting the solenoid valve is introduced into the chamber (11b) of the spool 11 inserted into the chamber (6b) to operate the hydraulic pressure.

Subsequently, the hydraulic pressure introduced into the chamber 11b of the spool 11 acts on the contact end 2a of the plunger 2 through the passage hole 11d communicating with the chamber 11b, and the contact end ( The hydraulic pressure acting on the 2a) forms a flow path between the plunger 2 and the spool 11 so that the narrow connection portion between the extended body 4 and the flow path forming body 5 in which the supplied hydraulic pressure forms the valve body 3 ( It is discharged through the flow path hole 8 formed in 7).

In this way, the hydraulic pressure discharged through the passage hole 8 formed in the narrow connection portion 7 of the valve body 4 is supplied to the brake mechanism B to brake the wheels.

At this time, the valve 10 blocking the chamber 6b formed in the flow path forming body 5 of the valve body 3 blocks the flow passage due to the hydraulic pressure acting in the chamber 6b. Flow through the valve 10 is not formed.

On the other hand, when the brake is released, the oil flowing from the brake mechanism B to the master cylinder M is returned to the oil reservoir, which is shown in FIG. 3. The modulator block A of the master cylinder M is shown in FIG. 3. When the hydraulic pressure does not act toward the solenoid valve provided therein, the hydraulic pressure acts toward the solenoid valve from the brake mechanism (B) side.

As such, the flow path formed at the extension contact end 11c of the spool 11 by the return of the spring 11 is the contact end 2a of the plunger 2 which is subjected to the hydraulic pressure as the hydraulic pressure does not work when the brake is released. The hydraulic pressure which blocks the hole 11d and acts toward the solenoid valve from the brake mechanism B is filled into the space in the modulator block A in which the flow path forming body 5 of the valve body 3 is accommodated. The pressure is increased, and the hydraulic pressure raised in the space in the modulator block A acts toward the check valve 10 provided in the flow path forming body 5.

As such, the hydraulic pressure acting toward the check valve 10 forms a flow passage in the check valve 10, and thus the hydraulic pressure returned is the master cylinder M through the chamber 6b of the valve body 10. Is returned to the oil reservoir.

At this time, the check valve (10) has a major influence on the quick response of the hydraulic return response of the solenoid valve, all the returned hydraulic pressure acts toward the check valve (10), and the check valve (10) two Since it is formed as described above, a rapid flow passage is formed to quickly form a return response.

As described above, according to the present invention, at the time of the hydraulic return of the solenoid valve forming the oil passage between the master cylinder and the brake mechanism, the return hydraulic pressure acts directly as the check valve to quickly form a flow path for the return and at least two Since the above check valve is used, there is an effect having a quick response to improve the hydraulic return when the brake is released.

Claims (3)

In the solenoid valve for supplying the braking hydraulic pressure of the master cylinder (M) to the brake mechanism (B) through a booster for boosting the pedal force of the brake pedal (P), A plunger 2 operated by a coil body 1 that is supplied with power and excited in accordance with a control signal of a control device for brake action; A flow path forming body 5 which is press-fitted into the modulator block A and integrally connected to an extension body 4 into which the plunger 2 is inserted through the plunger hole 6a to form a flow path, and the flow path forming body 5 A narrow connection portion 7 having a flow path hole 8 formed therein and communicating with a chamber 6b into which hydraulic pressure flows, and a check valve hole 9 circumferentially communicating with the chamber 6b of the flow path forming body 5. Valve body (3) consisting of two check valves (10) which are provided at two positions opposite to each other, acting only toward the chamber (6b) upon hydraulic return; A flow path forming body 11a inserted into the chamber 6b formed in the valve body 3 to form a chamber 11b to which hydraulic pressure acts, and a plunger 2 protruding from an end of the flow path forming body 11a; The extended contact end 11c formed in the shape of a sphere so as to be in close contact with the spherical contact end 2a of the opening, and the opening is extended to the extended contact end 11c while leading to a smaller diameter than the chamber 11b formed in the flow path forming body 11a. A spool 11 having one end supported by the flow passage 11d and the extended contact end 11c and one end supported by the plunger 2; The solenoid valve for brake oil flow control, characterized in that consisting of. delete delete

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