KR20000016745U - Hydraulic brake device and normal close valve having bypass valve - Google Patents

Abstract

The present invention relates to a hydraulic braking device, the hydraulic braking device 500 of the present invention is a low pressure accumulator (in case of releasing braking between the inlet side of the low pressure accumulator 130 and the outlet side of the wheel cylinder 150 ( Bypass valve 400 is installed to allow the oil remaining in the 130 to return to the master cylinder 100 through the wheel cylinder 150 and the normal open valve 110, the bypass valve 400 is It is installed in the normal close valve 200. In the hydraulic braking device of the present invention, by installing a normal close valve having a bypass valve, it is possible to completely return oil without unnecessary operation for returning oil after braking, thereby reducing operating efficiency and operating noise. And since it is not necessary to provide a separate device or installation to open and close the normal close valve when supplying the oil has the effect of enabling the supply of oil more easily.

Description

Hydraulic brake device and normal close valve having bypass valve

The present invention relates to a hydraulic braking device, and more particularly, to a solenoid valve of the hydraulic braking device to prevent the excessive driving to further discharge the brake fluid after braking of the brake device.

Generally, the antilock brake system, which is a hydraulic braking device, is a device that secures the direction stability and driving force of the vehicle by suppressing excessive slip of the driving wheel of the vehicle, and is applied to the wheel cylinder of each wheel when the vehicle is braked. Since the pressure is adjusted by reducing or increasing the hydraulic pressure, a proper cornering force is secured to maintain steering and at the same time control the slip rate to obtain the largest value of the friction coefficient so that the braking stop distance is the shortest.

As shown in FIG. 1, the conventional hydraulic brake device 50 includes a master cylinder 10, a normal open valve 11, a normal close valve 20, and a high pressure accumulator. 12), a low pressure accumulator 13 is provided, and a pump 14 is mounted between the high pressure accumulator 12 and the low pressure accumulator 13. In addition, the normal open valve 11 is provided with a bypass valve 11a for allowing the oil of the wheel cylinder 15 to return to the master cylinder 10 by the reverse flow due to the reduced pressure when the brake is released.

Normally, the normal close valve 20 is composed of a driving unit 30 and a coil unit 40 as shown in FIG.

First, the drive unit 30 forms an appearance and is coupled to a bore (not shown) of a hydraulic control unit (not shown), and an orifice flow passage 31 has a valve housing 32 formed therein and an outer end of the valve housing 32. A plunger 36 having a sleeve 33 coupled to the sleeve 33 and a magnet core 34 and an armature 35 installed in the sleeve 33, and opening and closing the orifice flow passage 31 through the armature 35. The armature 35 is installed between the armature 35 and the magnet core 34 by the support spring 37 is to be supported downward.

The coil unit 40 includes a coil case 41 forming an appearance and a coil 42 wound inside the coil case 41.

The operation of the hydraulic brake device in which the conventional normal close valve 20 is installed is introduced into the wheel cylinder 15 of the vehicle through the normal open valve 11 by the operation of the master cylinder 10, and the wheel cylinder 15. ) Oil is introduced into the low pressure accumulator 13 by the operation of the normal closing valve 20 due to the release of the braking, the oil in the low pressure accumulator 13 is the high pressure accumulator through the pump 14 Pumped to (12) and the oil continues to return to the master cylinder (10).

When braking is terminated during this operation, the low pressure accumulator 13 is in a state where a considerable amount of oil is stored even when braking is terminated.

Therefore, the operation of the hydraulic braking device performs a continuous operation (overrun) for a while to return all the oil of the low pressure accumulator 13 to the master cylinder 10 at the end of braking.

In this way, the conventional hydraulic braking device 50, even if the braking operation is terminated, the pumping operation must be continued for a while for the return of the residual oil, so that its operating efficiency is lowered, and noise (overrun noise) due to unnecessary operation is also reduced. It is triggered.

In addition, since oil is supplied to the oil system of the hydraulic circuit only when the normal closing valve 20 is opened when the oil is oiled after the installation of the hydraulic braking device 50, there is a need for a separate equipment and facility for supplying oil. there was.

The present invention is to solve the above-mentioned problems, the object of the present invention is to allow the oil to return without a separate pumping operation for the return of the residual oil as the hydraulic braking device terminates the braking operation to improve the operation efficiency An improved hydraulic braking system and a normal close valve installed in the hydraulic braking system are provided.

Another object of the present invention related to the above object is to provide a hydraulic braking device that can easily supply oil without a separate device and facilities when supplying oil to the braking device after installation of the hydraulic braking device.

1 is a hydraulic circuit diagram of a conventional hydraulic braking device.

Figure 2 is a cross-sectional view showing a conventional normal close valve.

3 is a hydraulic circuit diagram of a hydraulic braking device according to the present invention.

4 is a cross-sectional view showing a normal close valve according to the present invention.

Figure 5a is a view showing an operating state during the closing operation of the normal close valve according to the present invention.

Figure 5b is a view showing an operating state during the loosening operation of the normal close valve according to the present invention.

Figure 5c is a view showing an operating state when the brake release of the normal close valve according to the present invention.

* Description of the symbols for the main parts of the drawings *

100.Master cylinder 120 ... High pressure accumulator

130 Low pressure accumulator 200 Normally open valve

300 ... Drive 320 ... Valve housing

350 Armature 360 Magnet Core

370 ... support spring 340 ... branch euro

400 ... Bypass valve 410 ... Ball

420 ... cover 430 ... return spring

In order to achieve the above object, the hydraulic braking device of the present invention provides a braking action by hydraulic pressure caused by oil passing through a master cylinder, oil of the master cylinder, a normal open valve, and oil passing through the normal open valve. A wheel cylinder to be performed, a normal close valve for passing the oil of the wheel cylinder when the brake is released, a low pressure accumulator in which oil passing through the normal close valve is stored, a pump for pumping oil of the low pressure accumulator, A hydraulic braking device having a high pressure accumulator in which oil pumped from the pump is stored, wherein the brake is released between the inlet side of the low pressure accumulator and the outlet side of the normal open valve to the low pressure accumulator. Bypass valve to allow remaining oil to return to the master cylinder through the normal open valve Characterized in that installed.

The armature of the present invention has a valve housing having an outlet connected to a low pressure accumulator, an inlet connected to a wheel cylinder, an orifice flow passage formed therein, and a plunger portion to open the orifice flow passage. In the normal closed solenoid valve of the hydraulic braking device having a magnet core for elastically supporting, a magnet core and a sleeve coupled to the magnet core and the valve housing so that the armature is located therein, one end of the orifice flow passage A branch passage is formed in communication with the outlet of the valve housing, and the other end is in communication with the inlet of the valve housing. The branch passage blocks the oil flow of the branch passage during braking operation, and when the brake is released, The bypass valve to allow oil to flow to the wheel cylinder side Characterized in that installed.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the drawings.

Hydraulic braking device according to the present invention is the master cylinder 100, the normal open valve (110), the normal close valve (Normal close valve) 200 is first supplied with oil as shown in FIG. And a high pressure accumulator (HPA) 120, a low pressure accumulator (LPA) 130, and a pump 140, and a normal open valve 110 and a normal close valve 200. The bypass valves 110a and 400 are respectively provided in one piece with each other.

Normally, the normal close valve 200 is composed of a driving unit 300 and a coil unit 390 as shown in FIG.

First, the driving unit 300 forms an appearance and is coupled to the bore 160a of the hydraulic control unit 160, an orifice flow passage 310 is formed therein, and an outlet 320b is formed at the lower side thereof, and an entrance to the upper side thereof is formed. The valve housing 320 in which the 320a is formed is provided. The valve housing 320 has a coupling groove 320c formed on the outer circumference of the valve housing 320 so as to be caulked with the bore 160 inside the bore 160a, and between the upper side of the bore 160 and the valve housing 320. O-ring 330 for sealing is installed.

In particular, a separate branch flow path 340 is formed at the side of the orifice flow path 330 of the valve housing 320, one end of which is in communication with the inside of the bore 160a and the other end of which is in communication with the outlet of the bore 160a. The branch passage 340 is for returning the oil on the low pressure accumulator 130 to the master cylinder 100 through the branch passage 340 when the braking is released. Bypass valve 400 is installed.

The bypass valve 400 has a ball 410 located on the branch flow path 340, and supports the ball 410 and fixedly installed at an end communicating with the outlet 320b of the valve housing 320. And a cover 420 having a distribution hole 420a formed therein so as to allow oil to flow therethrough, and a restoring spring 430 installed at an end portion that elastically supports the ball 410 and communicates with the inlet 320a of the valve housing 320. Doing.

At this time, for the support of the restoration spring 430, the branch flow passage 340 is formed by vertically bending the middle portion thereof, and one end of the restoration spring 430 is supported by the vertical bending portion and the other end of the restoration spring 430 The ball 410 is supported.

An armature 350 having a plunger portion 350a for opening and closing the orifice flow passage 310 formed in the valve housing 320 is installed. The lower portion of the armature 350, that is, the plunger portion 350a, is in contact with the inlet of the orifice flow passage 310, and the upper portion of the armature 350 has a larger diameter than the lower portion and extends upward.

Next, a magnet core 360 is installed above the armature 350, and a support spring 370 for downwardly supporting the armature 350 is installed between the magnet core 360 and the armature 350. An insertion groove 320c is formed at a portion of the 350 that contacts the support spring 370 so that a part of the support spring 370 is inserted.

In addition, a sleeve 380 extending from the lower portion of the magnet core 360 to the upper portion of the valve housing 320 and surrounding them is mounted.

On the other hand, the coil unit 390 includes a coil case 390b forming an appearance and a coil 390a wound inside the coil case 390b.

Hereinafter will be described the operation of the hydraulic braking device according to the present invention having a normal close valve configured as described above with reference to Figures 5a, b, c will be mainly described the operation of the normal close valve. And the hydraulic circuit, see FIG.

First, the normal braking time will be described with reference to FIG. 5A.

As the braking is performed during normal braking, the oil is supplied from the master cylinder 100 to the wheel cylinder 150 through the normal open valve 110 and braking is performed as the pressure in the wheel cylinder 150 increases. To lose.

If slip occurs in the wheel 170 during normal braking at this time, the slip control operation is performed. At this time, the normal closing valve 200 is momentarily opened in the state in which the hydraulic pressure of the wheel cylinder 150 is increased (see FIG. 5B), and the oil of the wheel cylinder 150 is normal as the normal open valve 110 is closed. The low pressure accumulator 130 exits through the close valve 200, and thus the braking state is momentarily released from the wheel 170.

Then, the normal open valve 110 is opened again so that the oil is supplied to the wheel 170 again in the locked state. The locking and unlocking of the wheel 170 is performed continuously so that the slip and prevention of the slip of the vehicle can be made more stable.

On the other hand, the oil introduced into the low pressure accumulator 130 during slip braking is pumped to the high pressure accumulator 120 by the continuous operation of the pump 140, the oil in the high pressure accumulator 120 is master again It is distributed to the cylinder 100 to allow oil to be returned.

And as shown in Figure 5c when the braking is completed, the operation of the pump 140 is also stopped at the same time. Therefore, the oil remaining in the low pressure accumulator 130 does not return to the high pressure accumulator 120 by the pump 140, but returns to the opposite direction to the inflow direction.

At this time, the return is performed by the pressure in the low pressure accumulator 130 (as shown in FIG. 3, the low pressure accumulator 130 is provided with a piston 130a elastically supported by the spring 130b). The branch passage 340 is opened by pushing the ball 410 installed in the branch passage 340 of the normal close valve 200. The oil passing through the branch passage 340 is returned to the master cylinder 100 through the wheel cylinder 150 and the normal open valve 110.

Therefore, the oil is returned without the unnecessary operation of the pump 140 to pump the residual oil at the end of braking.

On the other hand, supplying the first oil to the hydraulic braking device 500 is installed in the normal close valve 200 of the present invention can be supplied without a separate device and installation, the supply of oil at this time to the hydraulic control unit 160 When the oil is supplied to the outlet side of the normal close valve 200 in the formed bore, since the oil can be circulated as a whole, the supply can be made.

In addition, the aforementioned bypass valve may be installed separately on the flow path without being installed in the normal close valve.

As described above, in the hydraulic braking device of the present invention, by installing a normal close valve having a bypass valve, oil can be completely returned without unnecessary operation for oil return after braking, thereby reducing operating efficiency and operating noise. . And since it is not necessary to provide a separate device or installation to open and close the normal close valve when supplying the oil has the effect of enabling the supply of oil more easily.

Claims (5)

A master cylinder supplied with oil during braking, a normal open valve through which oil of the master cylinder passes, a wheel cylinder to perform a braking action by hydraulic pressure by oil passing through the normal open valve, and release the braking oil of the cylinder A normal close valve for passing through the city, a low pressure accumulator for storing oil passing through the normal close valve, a pump for pumping oil of the low pressure accumulator, and a high pressure accumulator for storing oil pumped from the pump In the hydraulic braking device provided, Between the inlet side of the low pressure accumulator and the outlet side of the wheel cylinder, oil remaining in the low pressure accumulator can be returned to the master cylinder through the wheel cylinder and the normal open valve when the brake is released. Hydraulic brake device characterized in that the bypass valve is installed. According to claim 1, wherein the bypass valve is a branch flow path branched from the orifice flow path formed in the normal close valve and the ball installed on the branch flow path and the ball to support the ball and the cover formed with a distribution hole elastically Hydraulic braking device comprising a restoring spring. A valve housing having an outlet communicating with a low pressure accumulator, an inlet communicating with a wheel cylinder, and having an orifice flow passage therein, an armature forming a plunger portion to open the orifice flow passage, a magnet core elastically supporting the armature, and In the normal close valve of the hydraulic brake device having a sleeve that is coupled to the magnet core and the valve housing and the armature is located therein, One side of the orifice flow passage is formed with a branch flow passage in which one end is in communication with the outlet of the valve housing, the other end is in communication with the inlet of the valve housing, the branch flow path is blocked the oil flow of the branch flow passage during braking operation, The normal closing valve of the hydraulic brake device, characterized in that the bypass valve is installed to allow the oil of the low pressure accumulator to flow to the wheel cylinder when the brake is released. 4. The bypass valve of claim 3, wherein the bypass valve includes a ball installed on the branch flow passage, a cover installed at the valve housing outlet side of the branch flow passage to support the ball, and a ball installed on the branch flow passage to elastically support the ball. Normal closing valve comprising a restoring spring. 5. The normal close valve according to claim 4, wherein the branch flow path is bent at an intermediate portion thereof, one end of the restoring spring is supported by the bent portion, and the other end is supported by the ball.