KR101349451B1 - Solenoid valve with magnet filter - Google Patents

Abstract

The present invention relates to a solenoid valve having a magnet filter installed on one side of a bypass flow path of a solenoid valve to prevent inflow of metallic foreign substances, and according to an embodiment of the present invention, a guide hollow portion is provided. A flange having at least one port spaced apart from each other in a longitudinal direction on the outer circumferential surface and communicating with the guide hollow portion, a spool installed to be slidably movable in the guide hollow portion, and installed at a lower end of the spool, In the solenoid valve including a drive unit for sliding the spool by the bypass, a bypass flow path is formed in the drive unit to enable the bypass of oil or air, one side of the bypass flow path for blocking the inflow of metallic foreign matter Magnet filter is characterized in that is installed A solenoid valve with a magnet filter is provided.

Description

Solenoid valve with magnet filter {SOLENOID VALVE WITH MAGNET FILTER}

The present invention relates to a solenoid valve, and more particularly, to a solenoid valve having a magnet filter installed on one side of a bypass flow path of a solenoid valve to prevent inflow of metallic foreign substances.

In general, internal combustion engines for automobiles require stronger torque and lower rotational speeds when they start running, and higher rotational speeds than torques for faster driving speeds.

Therefore, the transmission is to reduce the rotational speed and increase the torque at the same time when starting using the gear to maintain a constant rotation of the engine, and to increase the rotational speed when the running speed is a transmission.

Such a transmission includes a manual transmission in which a person directly manipulates a clutch, and an automatic transmission in which a shift in accordance with speed is automatically performed by hydraulic pressure.

In the conventional automatic transmission, solenoid valves are mainly used to control the clutch by a low reduced control pressure (for example, 5 to 7 bar).

1 is a cross-sectional view of a solenoid valve disclosed in Korean Patent Registration No. 10-0903834 (Patent Document 1).

As shown in FIG. 1, the conventional solenoid valve 10 has a guide hollow portion 21 therein, and the guide hollow portion 21 has a feedback chamber 22, a supply chamber 23, and a control chamber ( 24, a spool 30 having a discharge chamber 25 formed therein, a spool 30 movably installed in the guide hollow portion 21 of the flange 20 and having one or more annular grooves 31a, 31b, and It is configured to include a drive unit 40 for moving the spool (30).

At this time, the outer peripheral surface of the flange 20 is spaced apart from each other in the longitudinal direction to form a feedback port 22a, a supply port 23a, a control port 24a, a discharge port 25a, these are respectively feedback chamber 22, It communicates with the supply chamber 23, the control chamber 24, and the discharge chamber 25.

On the outer circumferential surface of the spool 30, a plurality of land portions 32a to 32c having widths are formed to be spaced apart from each other in the longitudinal direction by the annular grooves 31a and 31b, and these land portions 32a to 32c are formed. When the spool 30 is moved by the drive unit 40, the above-described ports 22a to 25a open and close.

At this time, an external hydraulic supply source (for example, a hydraulic pump) (not shown) is connected to the supply port 23a, and the hydraulic pressure is supplied into the flange 20, and the control port 24a is a clutch of the transmission (not shown). It is connected to provide a control pressure to the side) to adjust the clutch pressure, and the residual pressure in the solenoid valve 10 is discharged through the discharge port 25a.

In addition, the drive unit 40 includes a bobbin 42 wound around the coil 41, a housing 43 surrounding the outer circumferential surface of the bobbin 42, and an armature 44 provided to be movable up and down on the inner diameter of the bobbin 42. And a spindle 45 fixed to the central portion of the armature 44 and in contact with the lower end of the spool 30, a core 46 disposed at one end of the armature 44 and the other end of the armature 44. A pole 47 and a terminal portion 48 connected to the bobbin 42 are included.

At this time, the conventional solenoid valve 10 as described above has no bypass flow path in the driving unit 40, so the precision of the hydraulic performance is lowered, and the hysteresis characteristics are irregular, which makes it difficult to precisely control hydraulic pressure when the transmission is shifted.

Therefore, there is a need to form a bypass flow passage communicating the inside of the driving portion 40 and the outside of the solenoid valve 10. In this case, there is a problem that foreign matter flows into the driving portion 40 through the bypass flow passage. .

In particular, since the armature 44 and the spindle 45 slide by the magnetic force in the driving unit 40, iron (Fe) -based metallic foreign substances such as transmission components chips or belt wear materials flow into the driving unit 40. In this case, precise hydraulic control is impossible due to abnormal behavior of the armature 44, and a shift shock occurs or shifts do not occur during shifting.

Patent Document 1: Korean Patent Registration No. 10-0903834

The present invention has been made to solve the above-described problems, an embodiment of the present invention, in the solenoid valve formed by the bypass flow path in the drive unit, by providing a magnet filter on one side of the bypass flow path, the metallic foreign matter An object of the present invention is to provide a solenoid valve that can prevent the inflow of the drive unit.

According to a preferred embodiment of the present invention, there is a flange having at least one port communicating with the guide hollow portion and spaced apart from each other in the longitudinal direction on the outer peripheral surface having a guide hollow portion therein, the guide hollow can slide A solenoid valve including a spool which is installed to be securely installed, and a driving unit which is installed at a lower end of the spool and slides the spool by a current supply. And, one side of the bypass flow passage is provided with a solenoid valve having a magnet filter, characterized in that the magnet filter is installed to block the inflow of metallic foreign matter.

Here, a through hole communicating with the bypass flow path is formed at one side of the bottom coupling part of the flange, and a mounting groove is formed at the bottom of the coupling part to communicate with the through hole and to mount the magnet filter.

The driving unit includes a housing having a space therein and coupled to a lower end of the flange, and a core accommodated in the housing and disposed at a lower end of the coupling part of the flange, wherein the magnet filter includes the coupling part and the Interposed between the cores.

In this case, the magnet filter includes a ring-shaped case having at least one or more protrusions at an upper end and a lower end thereof, and a ring magnet accommodated in the case.

In addition, the receiving groove is formed along the inner diameter edge of the case, the ring magnet is accommodated in the receiving groove.

At this time, it is preferable that at least one coupling protrusion is formed in the receiving groove to be spaced apart from each other in the circumferential direction, and at least one coupling groove corresponding to the coupling protrusion is formed in the ring magnet.

Meanwhile, the case may be integrally injection molded together with the ring magnet or manufactured by rubber molding.

According to the solenoid valve provided with a magnet filter according to an embodiment of the present invention, by preventing the metallic foreign material flows into the drive portion of the solenoid valve, it is possible to prevent the malfunction of the valve.

In addition, when the magnet filter is mounted in the bypass flow path, a gap is formed between the mounting surface due to the protrusion formed at the bottom of the magnet filter, so that oil or air can be easily flowed through the bypass flow path.

1 is a cross-sectional view of a conventional solenoid valve.
Figure 2 is a cross-sectional view of the solenoid valve is provided with a magnet filter according to an embodiment of the present invention.
3 and 4 are a perspective view of a magnet filter according to an embodiment of the present invention.
5 is a partially enlarged view of FIG. 2;
Figure 6 is a perspective view of a solenoid valve having a magnet filter according to an embodiment of the present invention.
7 is a graph showing the hysteresis curve when the solenoid valve is not applied to the magnet filter.
Figure 8 is a graph showing the hysteresis curve during operation of the solenoid valve according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of a solenoid valve having a magnet filter according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

Example

2 is a cross-sectional view of a solenoid valve provided with a magnet filter according to an embodiment of the present invention.

As shown in Figure 2, the solenoid valve (hereinafter referred to as "solenoid valve") 100 is provided with a magnet filter according to an embodiment of the present invention, the flange 200 having a guide hollow portion 210 therein And, the spool 300 is installed on the guide hollow portion 210 so as to be movable slide, and is installed on the lower end of the flange 200 to slide the spool 300 along the guide hollow portion 210 by the current supply The driving unit 400 is included.

Here, the supply port 220, the control port 230, the discharge port 240, and the feedback port 250 are formed on the outer circumferential surface of the flange 200 spaced apart from each other in the longitudinal direction, each port 220 ~ 250 is in communication with the guide hollow portion (210).

At this time, an external hydraulic supply source (for example, a hydraulic pump) (not shown) is connected to the supply port 220, and the control port 230 is connected to provide a control pressure to the clutch (not shown) side of the transmission, thereby clutching the clutch. The pressure is adjusted, and the residual pressure in the solenoid valve 100 is discharged through the discharge port 240.

In addition, a feedback flow path (not shown) is formed at one side of the flange 200 to connect the control port 230 and the feedback port 250, so that a part of the control pressure discharged through the control port 230 is returned to the feedback port ( It is introduced through 250 and acts on the spool 300 by the feedback pressure.

On the outer circumferential surface of the spool 300, a plurality of land portions 310 having a wider width are formed to be spaced apart from each other by an annular groove 320, and these land portions 310 are formed at respective ports (slides) when the slide of the spool 300 moves. 220 ~ 250) serves to open and close.

In addition, in the guide hollow portion 210, the space between each port 220 ~ 250 and the land portion 310 of the outer circumferential surface of the spool 300, respectively, the supply chamber 221, the control chamber 231, the discharge chamber 241 And the feedback chamber 251, and thus, the hydraulic pressure supplied through the supply port 220 flows into the supply chamber 221 and then moves to the control chamber 231 when the spool 300 moves upward. The control port 230 acts as a control pressure to the clutch side, at this time, a part of the control pressure is introduced into the feedback chamber 251 through the feedback flow path, the spool 300 by the area difference of the land portion 310 The feedback pressure acts downward in the drawing.

On the other hand, the stopper 500 is coupled to the upper end of the guide hollow portion 210, the return spring 600 is interposed between the lower end of the stopper 500 and the upper end of the spool 300, the return spring 600 is While acting as a shock absorber when the spool 300 moves upward, it provides an elastic force downward with respect to the spool 300.

That is, the spool 300 is forced to return to the initial state by the elastic restoring force of the return spring 600 and the feedback pressure in the feedback chamber 251, the spool by the force and the drive unit 400 Linear pressure control is achieved by using the balance between the forces applied to the (300).

At this time, it is preferable that the steel filter 260 is installed in the supply port 220 and the control port 230 to prevent foreign substances from entering.

On the other hand, the drive unit 400 has a space therein, the housing 410 is coupled to the lower end engaging portion 270 of the flange 200, and in close contact with the lower end of the spool 300 in the space of the housing 410 The spindle 420 disposed, the armature 430 to which the spindle 420 is coupled to the hollow, the bobbin 440 surrounding the armature 430 and the coil 441 is wound around the outer circumferential surface, and the upper end of the bobbin 440. A core 450 disposed between the surface and the lower surface of the engaging portion 270 of the flange 200 to receive the upper end portion of the armature 430 in the inner diameter portion 451, and the core 450 at the lower end of the armature 430. And a pole 460 arranged to face the lower end of the armature 430 and accommodating the lower end portion of the armature 430 in the receiving groove 461. As shown in FIG. When applied, the armature 430 moves upward with the spindle 420, and the spindle 420 pushes the lower end of the spool 300 to move the spool 300 upward. At this time, the lower end of the housing 410 is provided with a connector guide 470 for power connection.

Here, in the case of the conventional solenoid valve, the precision of the operation control of the spool 300 by the positive / negative pressure formed in the space portion of the housing 410 at the time of valve operation such as the reciprocating movement of the armature 430 and the spindle 420. There was a problem of deterioration.

Therefore, the solenoid valve 100 according to an embodiment of the present invention, by forming a bypass flow path in the drive unit 400 so that oil or air outside the solenoid valve 100 passes through the drive unit 400, When the valve is operated, a positive / negative pressure is prevented from being formed in the space of the housing 410.

To this end, a through hole 271 is formed in the coupling part 270 of the flange 200, and a bypass flow path communicating with the through hole 271 is formed in the driving part 400. At this time, the through hole 271 may be formed through the circumferential direction along the edge of the coupling portion 270 of the flange 200, preferably at least one spaced apart from each other in the circumferential direction.

The oil or air introduced into the housing 410 through the through hole 271 is formed in the core 450 through the slide hole 452 provided at the top of the center of the core 450 to allow the spindle 420 to rise and fall. It flows to the inner diameter part 451 and passes through the first guide groove 453 which is vertically formed at one side of the inner diameter part 451 of the core 450.

At this time, between the outer circumferential surface of the spindle 420 and the inner diameter portion 451 of the core 450, a cylindrical first bushing 481 is interposed on the outer circumferential surface of the spindle 420 to prevent the spindle 420 from flowing and tilting. The first guide groove 453 is formed at one side of the outer circumferential surface of the first bushing 481 in the longitudinal direction, and is preferably formed at least one spaced apart from each other in the circumferential direction along the edge of the first bushing 481. .

On the other hand, the armature 430 having a magnet is spaced apart from the lower end of the first bushing 481. The armature 430 is inserted into and fixed to the outer circumferential surface of the spindle 420, and slides along the inner diameter of the core 450 together with the spindle 420 by a magnetic force generated when power is supplied to the coil 441. The spindle 420 pushes and moves the spool 300.

The oil or air passing through the first guide groove 453 vertically penetrates the armature 430 around the spindle assembly hole 431 of the armature 430 to flow downward through the armature 430. Guide flow path 432 is formed. At this time, the guide flow path 432 may be formed along the circumferential direction at one side of the spindle assembly hole 431, preferably at least one spaced apart from each other in the circumferential direction.

At the lower end of the armature 430, a pole 460 is disposed on the bottom surface of the space of the housing 410 space so as to face the core 450, and oil or air passing through the guide passage 432 is accommodated in the pole 460. It flows into the groove 461, and passes through the second guide groove 462 vertically formed at one side of the accommodation groove 461.

At this time, a second bushing 482 is interposed between the outer circumferential surface of the spindle 420 and the side wall of the receiving groove 461 of the pawl 460, and the second guide groove 462 is disposed between the outer circumferential surface of the spindle 420 and the second bushing 462. It is formed in the longitudinal direction on one side of the outer circumferential surface of the 482, it is preferably formed at least one spaced apart from each other in the circumferential direction along the edge of the second bushing (482).

In addition, a guide hole 463 is formed at a lower end of the side wall of the receiving groove 461 in a radial direction, and the guide hole 463 communicates with the outside of the pawl 460.

Therefore, the oil or air introduced into the lower portion of the receiving groove 461 of the pole 460 through the guide passage 432 and the second guide groove 462 flows out of the pole 460 through the guide hole 463. Thus, the lower end of the space portion of the housing 410 is reached.

On the other hand, the outer surface of the lower end of the housing 410 is coupled to the connector guide 470 for power connection, the wedge-shaped engaging portion 471 protruding from the edge of the connector guide 470 is formed in the lower end of the housing 410 It is inserted into the insertion groove 411 is provided.

In this case, a connection hole 442 communicating with the insertion groove 411 is formed at the hollow lower end of the bobbin 440. The connection hole 442 is preferably disposed to face the guide hole 463 of the pole 460. Therefore, the oil or air coming out of the pole 460 through the guide hole 463 of the pole 460 flows in the direction of the insertion groove 411 through the connection hole 442 of the bobbin 440.

At this time, a predetermined gap is formed between the engaging portion 471 of the connector guide 470 and the insertion groove 411 of the housing 410, the insertion groove 411 through the connection hole 442 of the bobbin 440. Direction-induced oil or air flows out of the housing 410 through this gap.

That is, according to one embodiment of the present invention, the bypass flow path formed in the driving unit 400 may include a first guide groove 453, a guide flow path 432, a second guide groove 462, a guide hole 463, and the like. And a connection hole 442, by which the bypass flow passage, the space inside the housing 410 communicates with the outside of the housing 410, thereby preventing the occurrence of positive / negative pressure in the space of the housing 410.

At this time, according to the solenoid valve 100 according to an embodiment of the present invention, in order to prevent the inflow of metallic foreign substances introduced into the drive unit 400, such as a transmission component chip (chip), belt wear material, flange 200 The magnet filter 700 is interposed between the lower end of the coupling portion 270 and the upper end of the core 450.

To this end, a mounting groove 272 on which the magnet filter 700 is mounted is formed at a lower end of the coupling portion 270 of the flange 200 to have a predetermined width and depth, and the magnet filter 700 is mounted on the mounting groove 272. When mounted, the central protrusion 454 of the top of the core 450 is inserted into the hollow of the magnet filter 700, and a predetermined gap is generated between the outer circumferential surface of the central protrusion 454 and the hollow inner circumferential surface of the magnet filter 700. This gap leads to the flow of oil or air.

3 and 4 are a perspective view of a magnet filter according to an embodiment of the present invention, Figure 3 is a perspective view showing an upper portion of the magnet filter, Figure 4 is a perspective view showing a lower portion of the magnet filter.

As shown in Figure 3 and 4, the magnet filter 700 according to an embodiment of the present invention is a ring (ring) as a whole, and accommodated in the case 710 and the case 710 of a synthetic resin or rubber material Ring magnet 720 to be included.

In this case, the case 710 and the ring magnet 720 may be manufactured by assembling two parts separately, and of course, may be integrally manufactured by insert injection molding.

The case 710 is provided with an accommodating groove 711 stepped along an inner rim, and the accommodating groove 711 has at least one coupling protrusion 712 spaced apart from each other in a circumferential direction, and the case 710 of the case 710 is provided. At least one or more protrusions 713 are formed on the lower side of the lower portion spaced apart from each other in the circumferential direction. At this time, the protrusion 713 is also formed in the center of the upper end of the coupling protrusion 712, the protrusions 713 formed on the upper and lower ends of the case 710, respectively, when the magnet filter 700 is coupled to the flow of the case 710 While preventing, the oil or air flows through the gap formed by the protrusion 713.

The ring magnet 720 is formed of a ring-shaped magnetic material, so as to correspond to the coupling protrusion 712 of the case 710, at least one or more coupling grooves 721 are spaced apart from each other in the circumferential direction. Therefore, when the ring magnet 720 is seated in the receiving groove 711 of the case 710, the coupling protrusion 712 of the case is inserted into the coupling groove 721 of the ring magnet 720, thereby the ring magnet 720 And the case 710 are combined, and the flow of the ring magnet 720 is prevented.

When the magnet filter 700 is mounted in the mounting groove 272 of the coupling part 270, the protrusion 713 at the top of the case 710 is supported at the bottom of the coupling part 270 of the flange 200, and the case 710 is provided. The lower protrusion 713 is supported on the upper end of the core 450, so that the upper end of the magnet filter 700 and the lower end of the flange 200, and between the lower end of the magnet filter 700 and the upper end of the core 450 A gap is formed by the protrusion 713, through which the flow of oil or air can be made.

FIG. 5 is an enlarged view of a portion of FIG. 2 illustrating a bypass flow of a driving unit equipped with a magnet filter, and FIG. 6 is a perspective view of a solenoid valve having a magnet filter according to an exemplary embodiment of the present invention.

An example in which oil or air bypasses the solenoid valve will be described with reference to FIGS. 5 and 6.

Oil or air introduced through the through hole 271 formed in the coupling portion 270 of the flange 200 is formed by the protrusion 713 of the magnet filter 700 and the upper end of the magnet filter 700 and the flange 200. Flow through the gap formed between the lower end of the, or the lower end of the magnet filter 700 and the upper end of the core 450, and passes through the inner diameter of the ring magnet 720.

In this process, the metallic foreign matter is attached to the magnet filter 700 by magnetic force and removed, and the metallic foreign matter contained in the oil or air introduced into the guide hollow portion 210 of the flange 200 through the discharge port 240 is also removed. It flows and is attached to the magnet filter 700 through the gap between the flange 200 and the spool 300.

The oil or air passing through the magnet filter 700 is then introduced into the inner diameter portion 451 of the core 450 through the slide hole 452 of the core 450.

Oil or air introduced into the inner diameter portion 451 of the core 450 flows to the lower end portion of the first bushing 481 through the first guide groove 453 formed at one side of the inner diameter portion 451 of the core 450. And, it flows to the receiving groove 461 of the pole 460 located in the lower end of the armature 430 through the guide flow path 432 formed in the armature 430.

Oil or air flowing into the accommodating groove 461 of the pawl 460 flows to the lower end of the second bushing 482 through the second guide groove 462 formed at one side of the accommodating groove 461, and the pole 460. The housing 410 through a gap between the guide hole 463 of the and the connecting hole 442 of the bobbin 440, the engaging portion 471 of the connector guide 470 and the insertion groove 411 of the housing 410. ) Will come out.

7 is a graph showing a hysteresis curve when the solenoid valve is not applied to the magnet filter, Figure 8 is a graph showing a hysteresis curve when the solenoid valve according to an embodiment of the present invention.

As shown in FIG. 7 and FIG. 8, in the case of the solenoid valve to which the magnet filter is not applied, the hysteresis excess and abnormal behavior are exhibited in the hysteresis curve of the hydraulic performance drawn during the operation, according to an embodiment of the present invention. In the case of the solenoid valve 100 to which the magnet filter is applied, the hysteresis characteristic is shown to be stable, and thus, accurate shift control is possible when the vehicle shifts.

100: solenoid valve
200: flange 210: guide hollow
270: coupling portion 271: through hole
272: mounting groove
300: spool 310: land part
320: annular groove
400: driving unit 410: housing
420: spindle 430: amateur
440: Bobbin 450: Core
454: central projection 460: pole
470: Connector Guide
500: stopper
600: return spring
700: magnet filter 710: case
711: receiving groove 712: coupling protrusion
713: projection 720: ring magnet
721: coupling groove

Claims (7)

A flange having a guide hollow portion therein and at least one port spaced apart from each other in a longitudinal direction on an outer circumferential surface thereof to communicate with the guide hollow portion;
A spool installed to be movable in the guide hollow portion;
A housing coupled to the lower end of the flange, a spindle disposed in close contact with the lower end of the spool in the housing, an armature to which the spindle is coupled to the hollow, a core accommodating the upper end of the armature, and a lower end portion of the armature. A drive unit for receiving and including a pawl installed on a bottom surface of the housing;
A through hole formed at one side of the flange, a guide flow passage communicating with the through hole and vertically passing through the armature, and an insertion groove communicating with the guide flow passage and formed at the bottom of the housing for coupling of the connector guide. Pass flow path; And
And a magnet filter comprising a ring-shaped case mounted in a mounting groove of the lower end of the flange so that the central protrusion of the upper end of the core is inserted into the hollow, and a ring magnet accommodated in the case.
During the flow of the oil or air introduced into the housing through the through hole through the gap between the magnet filter and the core, metallic foreign matter is removed, and is discharged to the outside through the insertion groove through the bypass passage. Solenoid valve is provided with a magnet filter, characterized in that.
delete delete The method according to claim 1,
Solenoid valve having a magnet filter, characterized in that at least one protrusion is formed on the top and bottom of the case.
The method according to claim 1,
Solenoid valve is provided with a magnet filter, characterized in that the receiving groove is formed along the inner diameter border of the case, the ring magnet is accommodated in the receiving groove.
The method according to claim 5,
At least one coupling protrusion is formed in the receiving groove so as to be spaced apart from each other in the circumferential direction, and at least one coupling groove corresponding to the coupling protrusion is formed in the ring magnet.
The method according to claim 1,
The case is a solenoid valve with a magnet filter, characterized in that the injection molded integrally with the ring magnet, or manufactured by rubber molding.

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