KR100711489B1 - Brake oil flux control typed solenoid valve - Google Patents

Abstract

The present invention relates to a solenoid valve for controlling the brake oil flow, wherein the solenoid valve forming the oil flow passage is applied to the brake braking force when the ESP is operated together with the brake operation to form an oil flow for generating a braking force. Therefore, when only the ESP is operated without brake operation, relatively more oil can flow than when the brake is operated, thereby strengthening the supporting structure of the spool which forms an oil flow passage while always improving responsiveness through smooth oil flow in the solenoid valve. The purpose is to prevent structural weakness caused by external forces.

The present invention for achieving the above object, the movement of the oil flow passage is moved from the inside in the solenoid valve provided between the master cylinder (M) and the pump (Pump) during the operation of the ESP (Electronic Stability Program) of the posture stability control The forming spool 6 causes the additional braking pressure to be generated using a narrow oil passage to assist the braking pressure generated from the master cylinder M when the ESP is operated with the brake operation, while the ESP without the brake operation. It is characterized by having a flow path structure using a relatively wide oil passage so that only a large braking pressure is generated when it is operating only.

Description

Brake oil flux control typed solenoid valve

1 is an internal configuration of the solenoid valve for controlling the ESP operation brake oil flow in accordance with the present invention

2 is a hydraulic flow chart of the solenoid valve when the ESP is acting under the braking operation of the driver according to the present invention.

 3 is a hydraulic flow diagram of a solenoid valve when the ESP is operated under the driver's braking operation according to the present invention.

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

1: coil body 2: plunger

3,8 spring 4: ball

5: Valve body 5a, 6a: Body

5b, 6b: Chamber 5c: Flow guide channel

5d: oil inlet hole 6: spool

6c: Inflow passage 7: Stopper

7a: flow path 9: housing

A: Modulator block B: Brake pedal

M: Master Cylinder

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 smoothly supplying braking hydraulic pressure at all times regardless of whether a driver brakes or not.

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, the anti-lock brake system and the traction control system also perform well when driving on straight roads. Unreliable oversteer on the other side and over steer on the inward side can be completely uncontrollable, reducing reliability of the vehicle.

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, when the rear wheel first reaches the adhesive limit between the tire and the road surface or excessive turning force is applied to the front wheel outside the turning, an oversteer phenomenon occurs in which the vehicle steers more severely than the steering angle manipulated by the driver. ESP controls front wheel brakes 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, the spool for forming the flow path in the solenoid valve forming the oil flow is a very important component for the ESP action, but the flow through the spool should be smoothly formed, but the spool for forming the flow path is usually It restrains the movement of the spool, and has a structure that is supported by a spring fitted to the outer diameter of the stopper while the flow path is opened and closed, and the contact friction force with the stopper due to frequent movement of the spool (according to opening and closing of the flow path) during operation. This frequent wear phenomenon is intensified.

In addition, the inner space of the solenoid valve in which the spool is accommodated has a structure in which oil must flow through the internal space not occupied by the spool, so that the spool is hardened while the spring is fitted to the outer diameter of the stopper formed to form the oil inflow space therein. This is due to the weakness of the support structure, which is greatly affected by the impact from the outside due to the simple support structure of the spool using the spring.

Accordingly, the present invention has been made in view of the above, and when the ESP is operated together with the solenoid valve forming the oil flow passage when the brake is operated, the oil flow is generated in addition to the brake braking force to generate the braking force. In addition, when only the ESP is operated without brake operation, the support structure of the spool allows relatively more oil to flow as compared to when the brake is operated, and always forms an oil flow passage while greatly improving responsiveness through smooth oil flow in the solenoid valve. Its purpose is to prevent structural weakness caused by external forces.

The present invention for achieving the above object, the master cylinder for generating a hydraulic pressure in accordance with the brake pedal operation to supply the braking pressure through the brake line to the brake mechanism provided on the wheel side, and is driven during the operation of the ESP as a posture stabilizer A solenoid valve for forming an oil flow passage for receiving oil from the master cylinder by a pump,
A body body forming a chamber in which oil is introduced while the plunger part provided with a ball is inserted, and an oil communicating with the chamber to introduce oil introduced from the oil passage formed in the body body into the chamber. A modulator for forming an oil flow passage between the pump and the master cylinder by forming a flow guide channel, a groove, which is grooved at a predetermined depth along the longitudinal direction to the chamber inner surface to introduce the oil introduced through the inflow hole and the oil inflow hole into the chamber space. A valve body press-fitted into the block to form an oil flow passage;
A plunger inserted into the chamber having a diameter equal to the chamber diameter of the body body constituting the valve body while being energized and energized by a coil body that is energized and excited by a spring;
A body body inserted into the chamber with the same diameter as the plunger at the opposite portion of the plunger inserted into the chamber of the valve body to block or open the oil inlet hole portion, and into the chamber at the opposite portion of the plunger inserted into the chamber of the valve body The chamber is formed inside the body with a larger diameter than the inflow passage so that the inflow passage, which is an oil passage through which the oil flows into the chamber, and the oil introduced into the inflow passage flows according to the contact state with the ball. A spool formed in a small flow rate oil flow passage opened and closed by a ball provided at the end of the plunger, and a large flow rate oil flow passage configured to directly supply the oil introduced into the valve body to the pump;
A stopper heat-treated for rigidity reinforcement while forming a flow passage penetrating therein to form a flow path of oil discharged from the spool and supporting the spool by a spring seated using a seating groove formed in the stopper; ;
A housing coupled to the coil body and the valve body, the housing being sealed with an airtight ring while receiving a plunger therein;
Characterized in that consisting of.

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

Figure 1 shows the internal configuration of the solenoid valve for controlling the ESP operating brake oil flow in accordance with the present invention, the present invention is a posture stability control device ESP (Electronic) to operate the brakes in a dangerous driving situation by the vehicle itself out of danger It relates to a solenoid valve that forms an oil passage between the master cylinder (M) and the pump (Pump) when the brake is operated or the brake is not operated when the Stability Program is operated.

The solenoid valve has a spool (6) which is moved inward by the hydraulic pressure of the oil flowing in to form an oil flow passage toward the pump, assists the braking pressure generated from the master cylinder (M) when the ESP is operated with the brake operation The oil in the pump is such that a wide oil passage is closed when pumping the pump and additional braking pressure is generated using a relatively narrow oil passage, while a sufficient magnitude of brake pressure is generated when only the ESP is operated without brake operation. When pumping, the narrow oil passage is closed and has a flow path structure that generates a braking pressure using a relatively wide oil passage.

That is, the solenoid valve having such a flow path structure is operated by the coil body 1 which is supplied with power and excited according to the control signal of the control device, and the plunger is supported by the spring 3 at one end. (2) and a valve body (5) press-fitted into the modulator block (A) forming an oil flow passage between the master cylinder (M) and the pump to form an oil flow passage, an oil filling chamber of the valve body ( 5b) is a large flow rate for supplying the oil flowing into the valve body (5) directly to the pump while forming a small flow oil flow passage which is opened and closed by the ball (4) provided at the end of the plunger (2) A spool 6 forming an oil flow passage, a stopper having the spring 8 inserted therein so that the spool 6 is supported by the spring 8 and forming a flow path for the oil to flow toward the pump 7 and the nose It consists of a body 1 and a housing 9 which is sealed to the milling machine and coupled to the valve body (5) receiving the plunger (2) to the inside.

Here, the valve body 5 is pressurized into the modulator block A and the body 5a having a chamber 5b filled with the oil introduced therein while the plunger 2 having the ball 4 is inserted therein. And an oil inlet hole 5d and the oil inlet communicated with the chamber 5b so as to introduce the oil introduced from the oil passage formed in the body 5a into the chamber 5b toward the chamber 5b. The flow guide channel 5c, which is a groove that is recessed to a predetermined depth along the longitudinal direction, is formed in the chamber 5b to flow the oil introduced through the hole 5d into the space of the chamber 5b.

At this time, the plunger 2 has the same diameter as the diameter of the chamber 5b of the body 5a and is inserted into the chamber 5b.

The spool 6 is inserted into the chamber 5b at an opposite portion of the plunger 2 inserted into the chamber 5b of the valve body 5 to block or open the oil inlet hole 5d. 6a and into the chamber 5b according to the contact state with the ball 4 while being inserted into the chamber 5b at an opposite portion of the plunger 2 inserted into the chamber 5b of the valve body 5. It is formed inside the body 6a with a larger diameter than the inflow passage 6c so that the oil introduced into the inflow passage 6c and the inflow passage 6c flows through the oil. The chamber 6b is formed.

At this time, the spool 6 has the same diameter as the diameter of the chamber 5b of the body 5a and is inserted into the chamber 5b.

In addition, the stopper 7 forms a flow passage 7a penetrating therein to form a flow path of oil discharged from the spool 6 side, and a spring seated using a seating groove formed in the stopper 7. The spool 6 is supported and supported by (8).

At this time, the stopper 7 is subjected to a heat treatment, which prevents contact wear caused by forming an oil passage and acting as a seat part while the spool 6 is always dropped and attached during operation. It is to have rigidity which is not affected by the assembly of the valve body 5 press-fitted into (A).

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.

As described above, when the ESP is operated together with the driver's brake operation, the hydraulic pressure generated from the master cylinder M is not shown when the brake pedal B is operated as shown in FIG. 1. It is supplied to the brake mechanism provided on the wheel side through the non-brake line to perform wheel braking.

At the same time, the ESP is operated for the stability of the vehicle, that is, the master cylinder M and the pump so that oil is suctioned from the master cylinder M for the oil pumping by the pump driven according to the operation of the ESP. The solenoid valve provided in between opens (or closes if the ESP is not in operation), which adds additional braking pressure by the master cylinder (M) to the brake mechanism that brakes the wheel. The pressure is supplied to control the braking state of the wheel more precisely.

That is, when power is supplied to the solenoid valve as the ESP is operated, as shown in FIG. The spool 6, which is pushed by the spring 8 inserted in the c), also moves with the plunger 2, which is moved toward the coil body 1.

However, the chamber 5b is provided through the oil inlet hole 5d formed in the valve body 5 of the solenoid valve pushed into the modulator block A along the hydraulic line from the master cylinder M before the solenoid valve is turned on. Since the oil flows into the space, the oil pressure filled in the space of the chamber 5b of the valve body 5 acts relatively large compared to the force of the spring 8 that pushes the spool 6, and thus the spool (6) overcomes the force of the spring (8) and moves towards the stopper (7) so that the ball (4) and the spool (6) fall apart.

Subsequently, as the gap between the ball 4 and the spool 6 is formed, the oil filled in the chamber 5b passes through the inlet passage 6c formed in the body 6a of the spool 6, and thus the chamber 6b. And the brake pressure is suctioned to the pump through the flow passage 7a of the stopper 7, and thus, in addition to the brake pressure of the master cylinder M to the brake mechanism receiving the brake pressure through the brake line, In accordance with the operation of the master cylinder (M) is supplied to the brake mechanism through a separate hydraulic line different from the brake line to the brake mechanism.

As such, the braking according to the brake operation and the braking by the ESP according to the vehicle state are simultaneously performed in an unstable driving braking state of the vehicle, thereby greatly improving the stability of the vehicle.

At this time, the oil flow following the ESP operation has a relatively small flow amount compared to the oil flow according to the brake actuation, which is moreover while the braking pressure by the ESP assists the braking pressure through the brake operated for wheel braking control. Because it is for precise control, it is not necessary to supply much oil through solenoid valve according to ESP operation.

On the other hand, when the ESP is operated for the stability of the vehicle when there is no driver's brake operation, the flow path of the solenoid valve is large because a large braking pressure must be generated due to the flow of a relatively large amount of oil compared to when the driver has the brake operation.

That is, when the hydraulic pressure through the master cylinder (M) is not supplied to the solenoid valve side as there is no operation of the brake pedal (B) as shown in FIG. 3, the coil body 1 is supplied by the power supplied to the solenoid valve. When the plunger 2 is excited to pull the plunger 2, the spool 6 is also moved toward the plunger 2 which is moved toward the coil body 1 by the spring 8 inserted into the stopper 7.

At this time, the spring 8 pushes the spool 6 sufficiently, which is an oil inlet hole 5d formed in the valve body 5 of the solenoid valve from the master cylinder M before the solenoid valve is turned on. Since the pressure of the oil introduced into the space of the chamber 5b does not work, the force of the spring 8 that pushes the spool 6 of the oil filled in the space of the chamber 5b of the valve body 5 is reduced. It is relatively large relative to the pressure, which causes the spool 6 to be moved by the spring 8 so as to fall between the spool 6 and the stopper 7.

Accordingly, the oil flows from the master cylinder M through the oil inlet hole 5d of the valve body 5 and flows through the stopper 7 through the gap formed between the spool 6 and the stopper 7. After the suction (Suction) to the pump via the passage (7a), the brake pressure is supplied to the brake mechanism through a hydraulic line formed separately from the brake line is not supplied to the brake mechanism to control the braking state of the wheel to maintain the stability of the vehicle do.

At this time, even if the braking pressure of the wheel is supplied only through the solenoid valve, sufficient stability is maintained because the overall design is made to maintain vehicle stability only by supplying oil through the solenoid valve during ESP design.

In addition, according to the characteristics of the flow path structure of the solenoid valve according to the present invention, the durability is also greatly improved, that is, the spring (8) for supporting the spool (6) forming the flow path is supported in the state accommodated inside the stopper (7) and In addition, since the spool 6 is inserted with a diameter that does not flow in the chamber 5b of the valve body 5, it is possible to maintain sufficient durability against external impacts.

As described above, according to the present invention, the oil flow passage of the solenoid valve forming the oil passage between the master cylinder and the pump is such that the flow rate of the oil pumped during the operation of the ESP is reduced so as to assist the brake pressure of the brake line when the brake is operated. On the other hand, when only the ESP is operated, the pumped oil flow rate flows relatively much, and the oil supply through the solenoid valve is smoothed, thereby ensuring stable running stability at all times, thereby improving reliability.

In addition, the present invention has a structure that prevents the flow of the spool forming the flow path in the solenoid valve, there is an effect that can maintain sufficient durability against external impact.

Claims (6)

The master cylinder (M) generates hydraulic pressure in response to the operation of the brake pedal (B) and supplies the braking pressure to the brake mechanism provided on the wheel side through the brake line, and the master cylinder by the pump driven during the operation of the ESP, which is a posture stabilizer. M) A solenoid valve forming an oil flow passage for receiving oil from A body 5a having a chamber 5b filled with the oil introduced therein as the portion of the plunger 2 provided with the ball 4 is inserted, and formed in the body 5a to the modulator block A. An oil inflow hole 5d communicating with the chamber 5b and oil introduced through the oil inflow hole 5d to flow the oil introduced from the formed oil passage into the chamber 5b are introduced into the chamber 5b space. To form a flow guide channel (5c), which is a groove cut into a predetermined depth in the longitudinal direction into the inner surface of the chamber (5b), and pressed into the modulator block (A) forming an oil flow passage between the pump in the master cylinder (M). A valve body 5 forming a flow passage; The diameter is the same as the diameter of the chamber 5b of the body 5a constituting the valve body 5 while being operated by the coil body 1 that is supplied with power and is excited by one end by the spring 3. A plunger 2 having a plunger 2 inserted into the chamber 5b; Body body which is inserted into the chamber 5b with the same diameter as the plunger 2 at the opposite portion of the plunger 2 inserted into the chamber 5b of the valve body 5 to block or open the oil inlet hole 5d. 6a and into the chamber 5b according to the contact state with the ball 4 while being inserted into the chamber 5b at an opposite portion of the plunger 2 inserted into the chamber 5b of the valve body 5. It is formed inside the body 6a with a larger diameter than the inflow passage 6c so that the oil introduced into the inflow passage 6c and the inflow passage 6c flows through the oil. It is formed as a chamber (6b) to form a small flow rate oil flow passage that is opened and closed by the ball (4) provided at the end of the plunger (2) and to supply the oil flowing into the valve body (5) directly to the pump A spool 6 forming a large flow oil flow passage; A flow passage 7a penetrating the interior is formed to form a flow path of oil discharged from the spool 6 side, and the spool 6 is formed by a spring 8 seated using a mounting groove formed in the stopper 7. Stopper (7) heat-treated for rigidity reinforcement while supporting the support); A housing (9) coupled to the coil body (1) and the valve body (5) and sealingly sealed by an airtight ring while receiving the plunger (2) therein; Solenoid valve for brake oil flow control, characterized in that consisting of. delete delete delete delete delete

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