KR101339615B1 - Solenoid valve with bypass passage filter - Google Patents

Abstract

The present invention relates to a solenoid valve provided with a bypass flow path filter for installing a filter on one side of a bypass flow path of a solenoid valve to prevent foreign substances from entering the driving part. An embodiment of the present invention provides a guide hollow portion therein. 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 comprising 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, and one side of the bypass flow path mesh for blocking the inflow of foreign matter by-pass flow filters with mesh network It provides a solenoid valve having a bypass flow path filter characterized in that.

Description

Solenoid valve with bypass flow filter {SOLENOID VALVE WITH BYPASS PASSAGE FILTER}

The present invention relates to a solenoid valve, and more particularly, to a solenoid valve having a bypass flow path filter installed on one side of a bypass flow path of a solenoid valve to prevent foreign substances from entering the driving unit.

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 operation of the clutch by a low-reduced control pressure (for example, 5-7 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 filter on one side of the bypass flow path, inflow of foreign matter To provide a solenoid valve that can prevent the.

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. In addition, a solenoid valve having a bypass flow path filter is provided at one side of the bypass flow path, wherein a bypass flow path filter having a mesh filter network is installed to block foreign substances from entering.

In this case, a through hole communicating with the bypass flow path is formed at one side of the lower coupling portion of the flange.

The drive unit includes a housing having a space therein and coupled to a lower end of the flange, a spindle disposed in close contact with the lower end of the spool, an armature to which the spindle is coupled to the hollow, and the outer side of the armature. It is accommodated in the space portion of the housing, the bobbin coiled on the outer peripheral surface, the core is coupled between the bobbin and the flange to receive the upper end of the armature in the core inner diameter, and the lower end of the armature in the pole inner diameter And a pole installed on the bottom surface of the housing so as to face the core, and a guide hole communicating with the pole inner diameter of the pole is formed at one side of the outer circumferential surface of the pole.

At this time, the assembling groove is formed in the circumferential direction on one side of the outer circumferential surface of the pole, the guide hole is preferably formed at least one along the assembly groove.

In addition, a ring-shaped bypass flow path filter is coupled to the assembly groove, wherein the bypass flow path filter includes a ring-shaped support member having at least one filter hole having a rectangular shape spaced apart from each other by a connecting part on an outer circumferential surface thereof; It is configured to include a filter network of the mesh (mesh) provided in the filter hole.

According to the solenoid valve provided with the bypass flow path filter according to an embodiment of the present invention, by preventing foreign matter from entering the drive portion of the solenoid valve, the phenomenon of shifting shock and shifting during valve malfunction and shifting It can prevent.

1 is a cross-sectional view of a conventional solenoid valve.
2 is a cross-sectional view of a solenoid valve having a bypass flow path filter according to an embodiment of the present invention.
3 is an exploded perspective view of a bypass flow path filter and a pawl according to an embodiment of the present invention;
4 is a partially enlarged view of FIG. 2;
5 is a graph showing the hysteresis curve when the solenoid valve is not applied with the bypass flow filter.
Figure 6 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 bypass flow path 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 having a bypass flow path 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 bypass flow filter according to an embodiment of the present invention, the flange having a guide hollow portion 210 therein ( 200, the spool 300 which is slidably installed in the guide hollow portion 210, and is installed at the lower end of the flange 200 and slides the spool 300 along the guide hollow portion 210 by supplying current. It includes a driving unit 400 to move.

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, the housing 410 is coupled to the coupling portion 270 having a space therein and the width is formed at the lower end of the flange 200, and the spool (in the space portion of the housing 410) A spindle 420 disposed in close contact with the lower end of the 300, an armature 430 on which the spindle 420 is coupled to the hollow, a bobbin 440 surrounding the armature 430, and a coil 441 wound around an outer circumferential surface thereof; A core 450 disposed between the upper end surface of the bobbin 440 and the lower end surface of the engaging portion 270 of the flange 200 to accommodate the upper end portion of the armature 430 in the core inner diameter portion 451, and the armature 430. And a pole (460) disposed at the bottom of the opposing core 450 and receiving the lower end of the armature 430 in the pole inner diameter portion 461, as shown in FIG. When power is applied to the coil 441, the armature 430 moves upward with the spindle 420, and the spindle 420 pushes the lower end of the spool 300. The 300 is moved upward. On the other hand, 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 core inner diameter portion 451, and passes through the first guide groove 453 formed perpendicular to one side of the core inner diameter portion 451 of the core 450.

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

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 and fixed to the outer circumferential surface of the spindle 420, and slides along the core inner diameter of the core 450 together with the spindle 420 by a magnetic force generated when power is supplied to the coil 441, At this time, the spindle 420 is moved by pushing 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 in the pole of the pole 460. It flows into the neck portion 461 and passes through the second guide groove 462 vertically formed on one side of the pole inner diameter portion 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 pole inner diameter portion 461 of the pole 460 on the outer circumferential surface of the spindle 420, and the second guide groove 462 has a second bushing ( 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 pole inner diameter portion 461 in a radial direction, and the guide hole 463 communicates with the outside of the pole 460.

Accordingly, oil or air introduced into the lower portion of the pole inner portion 461 of the pole 460 through the guide passage 432 and the second guide groove 462 flow 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, in order to prevent the introduction of metallic foreign substances introduced into the drive unit 400 such as a transmission component chip or a belt wear material, between the lower end of the coupling part 270 of the flange 200 and the upper end of the core 450. It is preferable that the magnet filter 700 be interposed.

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.

Meanwhile, in the above-described embodiment, oil or air introduced into the space portion of the housing 410 through the through hole 271 of the coupling portion 270 of the flange 200 is disposed between the locking portion 471 and the insertion groove 411. Although the process of outflowing through the gap has been described, this process can be performed in the opposite direction, of course. That is, the oil or air introduced into the space portion of the housing 410 through the gap between the locking portion 471 and the insertion groove 411 through the through hole 271 formed in the coupling portion 270 of the flange 200. It is also possible to leak out.

In this case, foreign matter introduced into the housing 410 through the gap between the engaging portion 471 of the connector guide 470 and the insertion groove 411 of the housing 410 is guide hole 463 of the pole 460. Through the inside of the pole inner diameter portion 461, there is a fear that the normal operation of the armature 430.

In order to prevent this, a bypass flow path filter 800 is provided in the guide hole 463 of the pole 460. More specifically, the assembly groove 464 is formed on the outer circumferential surface of the pole 460 around the guide hole 463. It is formed in the circumferential direction, and the ring-shaped bypass flow path filter 800 is coupled to the assembly groove 464.

3 is an exploded perspective view of a bypass flow path filter according to an exemplary embodiment of the present invention, and FIG. 4 is a partially enlarged view illustrating a bypass flow of a driving unit equipped with a bypass flow path filter.

As shown in FIG. 3, in the bypass flow path filter 800 according to the exemplary embodiment, at least one filter hole 811 having a rectangular shape is formed on the outer circumferential surface of the bypass channel filter 800 by being spaced apart from each other by the connection part 812. The ring member includes a support member 810 and a mesh filter network 820 provided in the filter hole 811 of the support member 810.

Therefore, as the filter network 820 is disposed outside the guide hole 463 of the pawl 460, oil or air outside the pawl 460 passes through the guide hole 463 as illustrated in FIG. 4. When entering the pole inner portion 461 of 460, foreign matter contained in oil or air is removed by the filter network 820.

That is, oil or air introduced into the housing 410 through a gap between the engaging portion 471 of the connector guide 470 and the insertion groove 411 of the housing 410 is connected to the connection hole 442 of the bobbin 440. Inflow into the guide hole 463 of the pole 460, the foreign matter contained in the oil or air is removed by the filter network 820 of the bypass flow path filter (800).

Thereafter, the oil or air introduced into the pole inner diameter portion 461 of the pole 460 passes through the slide hole 452 through the second guide groove 462, the guide flow path 432, and the first guide groove 461. It exits to the outside of the core 450 through the through-hole 271 formed in the coupling portion 270 of the flange 200 through the gap between the magnet filter 700 and the core 450.

5 is a graph showing a hysteresis curve when the solenoid valve is not applied to the bypass flow path filter, and FIG. 6 is a graph showing a hysteresis curve when the solenoid valve is operated according to an embodiment of the present invention.

5 and 6, in the case of the solenoid valve to which the bypass flow path filter 800 is not applied, hysteresis excess and behavior in the hysteresis curve of the hydraulic performance drawn in the operation process by the inflow of the driving unit 400 of foreign matter Although the above phenomenon is exhibited, in the case of the solenoid valve 100 to which the bypass flow path filter 800 is applied according to an embodiment of the present invention, the hysteresis characteristics are stable, and thus, accurate shift control is possible when the vehicle is shifted. .

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
460: Paul 470: Connector Guide
800: bypass flow filter 810: support member
811: filter hole 812: connection
820: filter network

Claims (6)

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 driving part accommodating the inner diameter of the pole and including a pole installed on a bottom surface of the housing;
A through hole formed at one side of the flange, a guide flow path communicating with the through hole and vertically passing through the armature, a guide hole communicating with the guide flow path and radially formed at a lower end of the side wall of the pole inner diameter portion, A bypass flow path formed at a lower end of the connector guide and including an insertion groove communicating with the guide hole; And
And a bypass flow path filter coupled to an outer circumferential surface of the pawl to prevent foreign material from entering the pole inner diameter portion through the guide hole.
The bypass flow path filter includes a ring-shaped support member having at least one filter hole of a rectangular shape spaced apart from each other by a connecting portion on an outer circumferential surface thereof, and a mesh filter network provided in the filter hole. Solenoid valve provided with a bypass flow path filter, characterized in that made.
delete The driving unit according to claim 1,
The solenoid valve is provided with a bypass flow path filter, characterized in that it further comprises a bobbin which is accommodated in the space of the housing so as to surround the outside of the armature, the coil is wound on the outer peripheral surface.
The method according to claim 1,
The solenoid valve is provided with a bypass flow path filter, characterized in that the assembling groove is formed in the circumferential direction on one side of the outer circumferential surface of the pawl, the guide hole is formed at least one along the assembly groove.
The method of claim 4,
The solenoid valve having a bypass flow path filter, characterized in that the support member is coupled to the assembly groove.


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