KR102391955B1 - Solenoid valve for electronic stability control - Google Patents

Abstract

The present invention relates to a solenoid valve which is installed on a vehicle ESC system and controls hydraulic pressure and flux generated from a master cylinder by a wheel cylinder, and particularly, to the solenoid valve for ESC having a permanent magnet, wherein the permanent magnet is further provided on a coil installation part of the solenoid valve so that the hydraulic pressure can be controlled without continuous driving of a coil. The solenoid valve comprises a flow path housing, a brush seat, a plunger, a magnetic core, an armature, a sleeve, a coil housing, the coil, a bobbin, and the permanent magnet.

Description

Solenoid valve for ESC with permanent magnet {SOLENOID VALVE FOR ELECTRONIC STABILITY CONTROL}

The present invention relates to a solenoid valve mounted on an ESC system of a vehicle to control the flow of hydraulic pressure generated from a master cylinder to a wheel cylinder. It relates to a solenoid valve for ESC equipped with a permanent magnet capable of controlling hydraulic pressure.

An ABS technology for preventing slip during braking is disclosed as a device for improving stability while driving of a vehicle, and the ABS installed in the vehicle secures stability during braking.

In addition, ESC (Electronic Stability Control) controls not only the ABS function but also the engine torque to maintain a stable vehicle posture in an emergency. Unlike ABS, which requires one sensor, ESC uses three or more sensors and additionally includes a valve. The two products, which are almost similar in appearance, are installed inside the engine room close to the driver's brake pedal position when assembling the vehicle. According to the Insurance Institute for Highway Safety (IIHS), ESCs are used as essential devices in vehicles so much that they reduce the risk of fatal accidents by 32-56%.

The brake hydraulic circuit of a general vehicle is largely divided into a master cylinder that generates hydraulic pressure by the operation of a brake pedal, and a wheel cylinder that is installed on each wheel and brakes each wheel by hydraulic pressure generated from the master cylinder. A solenoid valve assembly is installed between the cylinders to control the hydraulic pressure transmitted to the wheel cylinders to prevent slipping during braking of the vehicle.

In such a solenoid valve, when power is applied to the coil, a magnetic field is formed around the coil, and the armature, the magnet core, and the coil housing made of metal are magnetized to generate a magnetic force.

At this time, the magnet core is fixed inside the solenoid valve, so the armature moves toward the magnet core.

Since the plunger and the armature are always attached to each other by the spring coupled to the lower part of the plunger, the plunger moves according to the movement of the armature. The hydraulic pressure of the master cylinder is transmitted or not transmitted to the wheel cylinder.

At this time, the conventional solenoid valve is operated by the magnetic force of the coil, and in the section where the ball formed on the plunger through the armature and the plunger seals the sole seat, the battery is excessively consumed, and the battery is excessively consumed. There has been a disadvantage in that the components inside the solenoid valve are damaged due to the high heat generated by continuous operation.

(Patent Document 1) Republic of Korea Patent Registration No. 10-0919859 (2009. 09. 30)

An object of the present invention, devised to solve the above problems, is to further provide a permanent magnet at the coil installation part of the solenoid valve so that hydraulic pressure can be controlled without continuous driving of the coil, thereby reducing the consumption of the battery installed in the vehicle. It is to provide a solenoid valve for ESC equipped with a permanent magnet that prevents damage to components inside the solenoid valve by blocking the generation of high heat due to the continuous operation of the

The above object is achieved by the following configuration provided in the present invention.

The solenoid valve for ESC provided with a permanent magnet according to the present invention comprises: a flow path housing provided with a flow path through which hydraulic pressure generated in a master cylinder flows and is discharged to a wheel cylinder; a sole seat provided inside the flow path housing so that hydraulic pressure flowing from the flow path housing is discharged to the wheel cylinder; It is provided on the upper part of the sole seat, and a ball for sealing or opening the sole seat is formed on the lower part to open or seal the sole seat by moving up and down, and the middle part is accommodated in the elastic spring to receive the elastic force of the elastic spring. plunger; a magnet core accommodating the plunger; an armature connected to the plunger at an upper portion of the plunger and spaced apart from the upper end of the magnet core to move the plunger up and down by the magnetic force of the magnet core; a sleeve provided on the flow path housing to accommodate the magnet core and the armature; a coil housing provided on the outside of the sleeve to transmit magnetic force to the magnet core and the armature; A coil that determines whether hydraulic pressure flows by applying current in the forward and reverse directions inside the coil housing to excite or demagnetize the magnet core so that the armature moves up and down on the magnet core to open or close the sole sheet through the plunger; a bobbin accommodating the coil to protect and insulate the coil; It is fitted and fixed to the lower part of the coil housing to accommodate the sleeve, and even if the forward current of the coil is driven after the forward current of the coil is driven to seal the sole sheet, the magnetic force maintains the armature grounded to the magnet core and , a permanent magnet that drives the reverse current in the coil when the sole seat is opened to offset the residual magnetic force so that the armature is restored to its original position due to the elasticity of the elastic spring; characterized in that it is included and configured.

In addition, the magnet core is characterized in that it is provided with a soft buffer body having a thickness of 0.03 ~ 0.04mm at the top.

In the present invention made as described above, since the armature maintains the grounded state to the magnet core by the magnetic force of the permanent magnet, the driving of the coil is minimized to reduce the consumption of the battery installed in the vehicle, and the high heat caused by the continuous driving of the coil It has an innovative effect to prevent damage to the components inside the solenoid valve by blocking the occurrence.

In addition, since the permanent magnet is divided into four parts, it is possible to conveniently magnetize the permanent magnet in a desired direction, as well as to divide the raw material of the permanent magnet into four and produce it in an assembled form at a low price. This has the effect of significantly lowering the production cost.

In addition, since a soft buffer is provided on the upper end of the magnet core, noise is prevented when the armature and the magnet core are grounded by magnetic force, and the armature and the magnet core are spaced apart due to the thickness of the buffer when the coil reverses current action. There is an effect that the operation is made more easily.

1 and 2 are exemplary views showing the overall configuration and preferred mode of operation of the present invention;
3 and 4 are exemplary views showing a preferred form of the permanent magnet of the present invention;
5 is an exemplary view showing a preferred form of the buffer of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in more detail based on the accompanying drawings.

1 and 2 are exemplary views showing the overall configuration and preferred mode of operation of the present invention. As shown in Figs. 1 and 2, the present invention further includes a permanent magnet at the coil installation part of the solenoid valve to continuously It relates to a solenoid valve for ESC equipped with a permanent magnet capable of controlling hydraulic pressure without driving.

To this end, the present invention provides a flow path housing 10, a sole sheet 20 provided inside the flow path housing 10, a plunger 30 and a magnet core 40 provided on the sole sheet 20, and a plunger 30. ) connected to the upper part of the armature 50, the sleeve 60 and the coil housing 70 provided on the upper part of the flow path housing 10, the coil 80 provided inside the coil housing 70, the bobbin 90) And a permanent magnet 100 is included.

The flow path housing 10 is provided with a flow path through which the hydraulic pressure generated from the master cylinder flows and is discharged to the wheel cylinder. , the introduced hydraulic pressure is discharged through the sole seat 20 to be described later.

The sole seat 20 is provided inside the flow path housing 10 so that hydraulic pressure flowing from the flow path housing 10 is discharged to the wheel cylinder, and the sole sheet 20 is opened through the plunger 30 to be described later. Or it is sealed so that the hydraulic pressure is moved.

The plunger 30 is provided on the upper portion of the sole seat 20, and a ball 31 for sealing or opening the sole seat 20 is formed at the lower portion to open or open the sole seat 20 by moving up and down. Sealed, the middle is accommodated in the elastic spring 33 is configured to receive the elastic force of the elastic spring (33).

The magnet core 40 is configured to receive the plunger 30 to form a magnetic force.

The armature 50 is connected to the plunger 30 on the upper part of the plunger 30, is spaced apart from the upper end of the magnet core 40, and moves the plunger 30 up and down by the magnetic force of the magnet core 40. By moving, the opening or closing of the sole sheet 20 is made.

The sleeve 60 is provided on the flow path housing 10 and is configured to accommodate the magnet core 40 and the armature 50 .

The coil housing 70 is provided on the outside of the sleeve 60 and is configured to include a coil 80 , a bobbin 90 , and a permanent magnet 100 , which will be described later.

The coil 80 is configured such that the armature 50 moves up and down on the magnet core 40 by applying current in the forward and reverse directions inside the coil housing 70 to excite or demagnetize the magnet core 40 . .

That is, when the coil 80 applies current in the forward direction, the armature 50 is grounded to the magnet core 40, and when the current is applied in the reverse direction, the plunger returns to its original position by the elastic spring 33 through the action of restoring it. (30) is also linked to open or close the sole seat 20 through the ball 31 formed on the plunger 30 to determine whether hydraulic pressure flows.

The bobbin 90 is configured to receive the coil 80 to be protected and insulated from the coil housing 70 of the coil 80 .

The permanent magnet 100 is configured to be fitted and fixed to the lower portion of the coil housing 70 to accommodate the sleeve 60, and after a forward current is driven in the coil 80 to seal the sole sheet 20, the coil 80 ) is configured to maintain the state in which the armature 50 is grounded to the magnet core 40 by the magnetic force of the permanent magnet 100 even when the driving of the forward current is stopped.

That is, in the conventionally used solenoid valve, in order to maintain the state in which the armature 50 is grounded to the magnet core 40, the ball 31 formed in the plunger 30 seals the sole seat 20 continuously. The coil 100 should be driven, but in the present invention, the armature 50 maintains the grounded state to the magnet core 40 by the magnetic force of the permanent magnet 100 to minimize the driving of the coil 80 and is installed in the vehicle. While reducing the consumption of the battery, it is possible to exhibit an epochal effect of preventing damage to the components inside the solenoid valve by blocking the generation of high heat due to the continuous driving of the coil 80 .

Here, the diameter of the portion in which the elastic spring 33 of the plunger 30 is accommodated is approximately 2.6 to 2.9 mm, and the elastic spring 33 accommodating the plunger 30 of this diameter is used in preparation for the elastic force of the coil 80 ) to keep the armature 50 grounded to the magnet core 40 through the magnetic force of the permanent magnet 100 by is applied in the range of 0.85 to 2A, and the thickness of the sleeve 60 is preferably 0.3 to 0.4 mm.

On the other hand, as shown in Figs. 3 (a), (b) and 4 (a), (b), the permanent magnet 100 is divided into four sections, which are the inner and outer diameters of the permanent magnet 100 . Since silver is a relatively small size of 8 to 9 mm and 15 to 16 mm, respectively, when divided into 4 divisions, the magnetization of the permanent magnet 100 is conveniently made, and the raw material of the permanent magnet 100 is expensive, Compared to the shape in which the ring is integrated, it is possible to purchase the magnet 100 in an assembled form by dividing it into four parts, which has the effect of significantly reducing the production cost.

The permanent magnet 100 divided into 4 is fitted in the lower part of the coil housing 70 and is located under the bobbin 90, and in order to more firmly position the permanent magnet 100, the bobbin 90 is divided into 4 divisions. A plurality of protrusions 91 are formed so that the permanent magnet 100 can be retracted and fixed, so that the installation of the permanent magnet 100 can be performed more easily.

Here, as shown in FIG. 5, the magnet core 40 is provided with a soft buffer body 41 having a thickness of 0.03 to 0.04 mm at the upper end, and the buffer body 41 causes the armature 50 and the magnet core ( 40) to prevent noise when grounded by magnetic force.

In addition, limiting the thickness of the buffer body 41 to 0.03 ~ 0.04 mmmm is that the armature 50 presses the soft buffer body 41 in a state where the armature 50 and the magnet core 40 are grounded. When the distance between the armature 50 and the magnet core 40 is maintained at 0.01 ~ 0.02 mm, the armature 40 is restored to its original position due to the elastic force of the elastic spring 33 when the coil 100 reverses current action. This is easily performed so that the operation of the armature 40 can be made more easily.

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10: euro housing 20: sole seat
30: plunger 31: ball
33: elastic spring 40: magnet core
50: amateur 60: sleeve
70: coil housing 80: coil
90: bobbin 100: permanent magnet

Claims (4)

a flow path housing 10 in which hydraulic pressure generated from the master cylinder flows and is discharged to the wheel cylinder;
a sole seat 20 provided inside the flow path housing 10 so that hydraulic pressure flowing from the flow path housing 10 is discharged to the wheel cylinder;
It is provided on the upper portion of the sole sheet 20, and a ball 31 for sealing or opening the sole sheet 20 is formed at the lower portion to open or seal the sole sheet 20 by moving up and down, and the stoppage is not performed. The plunger 30 is accommodated in the elastic spring 33 and receives the elastic force of the elastic spring 33;
a magnet core 40 for accommodating the plunger 30;
An armature 50 that is connected to the plunger 30 on the upper part of the plunger 30, is spaced apart from the upper end of the magnet core 40, and moves the plunger 30 up and down by the magnetic force of the magnet core 40 );
a sleeve 60 provided on the flow path housing 10 to accommodate the magnet core 40 and the armature 50;
a coil housing 70 provided on the outside of the sleeve 60 to transmit magnetic force to the magnet core 40 and the armature 50;
By applying current in the forward and reverse directions inside the coil housing 70 to excite or demagnetize the magnet core 40, the armature 50 moves up and down on the magnet core 40 to open the sole sheet through the plunger. or a coil 80 to seal and determine whether hydraulic pressure flows;
a bobbin 90 accommodating the coil 80 to protect and insulate the coil 80;
It is fitted and fixed to the lower part of the coil housing 70 to accommodate the sleeve 60, and after the forward current is driven in the coil 80 to seal the sole sheet 20, the driving of the forward current in the coil 80 is stopped Even if the magnetic force maintains the grounded state of the armature 50 to the magnet core 40, and when the sole sheet 20 is opened, a reverse current is driven in the coil 80 to offset the residual magnetic force, and the elastic spring ( 33) a permanent magnet 100 to restore the armature 50 to its original position due to the elasticity of the;
In order to offset the magnetic force of the permanent magnet 100, a reverse current of the coil 80 is applied in the range of 0.85 to 2 A, and the thickness of the sleeve 60 is 0.3 to 0.4 mm,
The permanent magnet 100 is divided into 4 divisions, and is fitted under the coil housing 70 and is located below the bobbin 90, and the bobbin 90 is divided into 4 divisions. ) solenoid valve for ESC provided with a permanent magnet, characterized in that a plurality of protrusions 91 are formed so that they can be inserted and fixed. delete delete The method of claim 1,
The magnet core 40 is a solenoid valve for ESC provided with a permanent magnet, characterized in that a soft buffer 41 having a thickness of 0.03 to 0.04 mm is provided at the upper end.

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