KR101329431B1 - Solenoid valve with by-pass structure - Google Patents

Abstract

The present invention relates to a solenoid valve having a bypass structure by applying a bypass structure to a part constituting the solenoid valve, thereby maintaining a more precise hydraulic performance, according to an embodiment of the present invention, the guide hollow portion therein A flange having at least one port formed on the outer circumferential surface and spaced apart from each other in communication with the guide hollow portion; A spool installed to be movable in the guide hollow portion; And a driving unit installed at a lower end of the spool and sliding the spool by a current supply, wherein a bypass flow path is formed in the driving unit to allow oil or air to be bypassed. Solenoid valves are provided.

Description

Solenoid valve with bypass structure {SOLENOID VALVE WITH BY-PASS STRUCTURE}

The present invention relates to a solenoid valve, and more particularly, to a solenoid valve having a bypass structure by applying a bypass structure to a part constituting the solenoid valve, thereby maintaining a more precise hydraulic performance.

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 for controlling the clutch by a low reduced control pressure (for example, 5 to 7 bar) are mainly used.

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, since the bypass flow path is not formed in the driving unit 40 of the conventional solenoid valve 10, the precision of hydraulic performance is lowered, and the hysteresis characteristics are irregular, which makes it difficult to precisely control hydraulic pressure when the transmission is shifted.

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

The present invention has been made to solve the above problems, an embodiment of the present invention, by providing a bypass flow path in the drive unit, to provide a solenoid valve of the bypass structure that can maintain a more precise hydraulic performance For the purpose of

According to a preferred embodiment of the present invention, a flange having a guide hollow portion therein and at least one port formed in communication with the guide hollow portion spaced apart from each other in the longitudinal direction on the outer peripheral surface; 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; And 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. Bypass flow path; includes, the solenoid valve of the bypass structure is characterized in that the oil or air introduced into the housing through the through hole flows out through the insertion groove to the outside.

Here, at least one through-hole is formed along one edge of the lower coupling portion of the flange, and communicates with the guide flow path through a slide hole provided at the center upper end of the flange.

The driving unit may further include a bobbin in which a coil is wound on an outer circumferential surface of the housing so as to surround the outside of the armature, and a connector guide coupled to the insertion groove, wherein the core includes the core. It is coupled between the bobbin and the flange.

At this time, the guide flow passage is formed at least one to communicate with the core inner diameter of the core and the pole inner diameter of the pole. In addition, a first guide groove communicating with the guide flow path is formed at one side of the core inner diameter of the core.

In addition, a second guide groove communicating with the guide passage is formed at one side of the pole inner diameter portion of the pole.

In addition, a guide hole communicating with the second guide groove is formed in the pole inner diameter sidewall of the pole.

In addition, a connection hole communicating with the guide hole is formed at the hollow lower end of the bobbin, and air or oil passing through the connection hole flows out through the insertion groove.

According to the solenoid valve of the bypass structure according to an embodiment of the present invention, since oil or air can be bypassed through the driving unit, the performance of the solenoid valve is optimized by improving the accuracy of the hydraulic performance and reducing the hysteresis. When shifting, there is an effect capable of precise shift control.

1 is a cross-sectional view of a conventional solenoid valve.
Figure 2 is a cross-sectional view of the solenoid valve of the bypass structure according to an embodiment of the present invention.
3 is a partially enlarged view of FIG. 2;
Figure 4 is a perspective view of the solenoid valve of the bypass structure according to an embodiment of the present invention.
5 is a graph showing a hysteresis curve when a conventional solenoid valve is operated.
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 bypass solenoid valve 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

Figure 2 is a cross-sectional view of the solenoid valve of the bypass structure according to an embodiment of the present invention.

As shown in FIG. 2, the solenoid valve (hereinafter referred to as “solenoid valve”) 100 having a bypass structure according to an embodiment of the present invention includes a flange 200 having a guide hollow portion 210 therein. , A spool 300 which is installed to be slidably movable in the guide hollow portion 210, and a driving part installed at a lower end of the flange 200 to slide the spool 300 along the guide hollow portion 210 by a current supply. 400.

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. A pole 460 disposed at the lower end of the arm and facing the core 450 and accommodating the lower end of the armature 430 in the pole inner diameter portion 461, as shown in FIG. 2. When power is applied to the 441, the armature 430 moves upward with the spindle 420, and the spindle 420 pushes the lower end of the spool 300. 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 into and fixed to the outer circumferential surface of the spindle 420 and slides along the core inner diameter 451 of the core 450 together with the spindle 420 by a magnetic force generated when power is supplied to the coil 441. In this case, 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 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 coupling 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 coupling 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.

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 coupling portion 471 and the insertion groove 411. Although the process of leaking out through the gap has been described, it is not necessarily limited thereto, and the process may be performed in the opposite direction. That is, the oil or air introduced into the space portion of the housing 410 through the gap between the coupling 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.

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.

3 is a partially enlarged view of FIG. 2 showing a bypass flow as an arrow, and FIG. 4 is a perspective view of a solenoid valve of a bypass structure according to an embodiment of the present invention.

An example in which oil or air bypasses the solenoid valve will be described with reference to FIGS. 2 to 4.

Oil or air introduced through the through hole 271 formed in the engaging portion 270 of the flange 200 passes through the slide hole 452 of the core 450 to the core inner diameter portion 451 of the core 450. In this case, the oil or air flows into the guide hollow portion 210 of the flange 200 through the discharge port 240, and then the gap between the flange 200 and the spool 300 and the slide hole of the core 450. It may also be introduced into the core inner diameter portion 451 of the core 450 through (452).

The oil or air introduced into the core inner diameter part 451 of the core 450 is lower end of the first bushing 481 through the first guide groove 453 formed at one side of the core inner diameter part 451 of the core 450. Flows to the pole inner diameter portion 461 of the pole 460 located at the lower end of the armature 430 through the guide flow path 432 formed in the armature 430.

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

In this case, the process may be performed in the reverse direction as described above. That is, the oil or air introduced into the space in the housing 410 through the gap between the coupling part 471 and the insertion groove 411 is external through the through hole 271 formed in the coupling part 270 of the flange 200. It is also possible to spill.

5 is a graph showing a hysteresis curve when operating a conventional solenoid valve, Figure 6 is a graph showing a hysteresis curve when operating a solenoid valve according to an embodiment of the present invention.

5 and 6, in the case of the conventional solenoid valve without a bypass structure, the hysteresis curve of the hydraulic performance drawn during the operation shows an excessive or excessive area, but according to an embodiment of the present invention In the case of the solenoid valve 100 to which the pass structure is applied, the hysteresis characteristics are shown to be stable, and thus, accurate shift control is possible when the vehicle shifts.

100: solenoid valve
200: Flange 220: Supply port
230: control port 240: discharge port
250: feedback port 270: coupling part
271 through hole
300: Spool
400: driving unit 410: housing
411: Insertion groove 420: Spindle
430: Amateur 432: Guide Euro
440: bobbin 442: connecting hole
450: core 451: core inner diameter
453: first guide groove 460: pole
461: inner diameter of the pole 462: second guide groove
463 guide hole 470 connector guide
471: coupling part
500: stopper
600: return spring

Claims (8)

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; And
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. Including a pass passage;
The solenoid valve of the bypass structure, characterized in that the oil or air introduced into the housing through the through-hole flows out through the insertion groove.
The method according to claim 1, The through hole,
The solenoid valve of the bypass structure, characterized in that at least one formed along one side edge of the lower coupling portion of the flange, and communicates with the guide flow path through a slide hole provided in the upper center of the core.
The driving unit according to claim 1,
A bobbin which is accommodated in a space portion of the housing so as to surround the outside of the armature, and a coil wound around an outer circumferential surface thereof, and a connector guide coupled to the insertion groove, wherein the core is disposed between the bobbin and the flange. Solenoid valve having a bypass structure, characterized in that coupled.
The method according to claim 1,
And at least one guide passage is formed so as to communicate the core inner diameter portion of the core with the pole inner diameter portion of the pole.
The method according to claim 3,
The solenoid valve of the bypass structure, characterized in that the first guide groove in communication with the guide flow path is formed on one side of the core inner diameter of the core.
The method according to claim 5,
The solenoid valve of the bypass structure, characterized in that the second guide groove in communication with the guide flow path is formed on one side of the pole inner diameter of the pole.
The method of claim 6,
The solenoid valve of the bypass structure, characterized in that the guide hole in communication with the second guide groove is formed on the pole inner diameter side wall of the pole.
The method of claim 7,
A connecting hole communicating with the guide hole is formed in the hollow lower end of the bobbin, the solenoid valve of the bypass structure, characterized in that the air or oil passing through the connecting hole flows out through the insertion groove.

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