KR101232435B1 - Solenoid valve for auto transmission - Google Patents

Abstract

The present invention relates to a solenoid valve of an automatic transmission that is easy to secure processing and hydraulic linearity, and according to an embodiment of the present invention has a guide hollow portion therein, and the guide hollow portion is spaced apart from each other in the longitudinal direction on an outer circumferential surface thereof. A holder in which a supply port, a control port, a discharge port, and a feedback port are formed to communicate with each other; A control screw coupled to one end of the guide hollow portion; A spool member installed to be slidably movable in the guide hollow portion and having a guide part having a predetermined diameter extending from one end thereof; A cap member interposed between the adjusting screw and the spool member and having a guide groove corresponding to the guide portion of the spool member; And a driving unit installed at one side of the spool member and configured to slide the spool member by a current supply, wherein a feedback flow path communicating the feedback port and the guide groove is formed inside the spool member. A solenoid valve of an automatic transmission is provided.

Description

Solenoid valve of automatic transmission {SOLENOID VALVE FOR AUTO TRANSMISSION}

The present invention relates to a solenoid valve of an automatic transmission, and more particularly, to a solenoid valve of an automatic transmission that is easy to secure processing and hydraulic linearity.

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, the solenoid valve of the indirect control type which indirectly controls the clutch by a low reduced control pressure (for example, 5-7 bar) is mainly used. The solenoid valve of the indirect control method must be equipped with a complicated hydraulic circuit for the control of high flow rate and high clutch pressure (control pressure for clutch control).

However, the solenoid valve adopting the conventional indirect control method has a disadvantage in that the hydraulic circuit becomes more complicated as the transmission stage of the transmission increases, thereby increasing the size of the entire apparatus and increasing its manufacturing cost.

Accordingly, in recent years, a solenoid valve of a direct control type has been developed that can simplify the hydraulic circuit and thereby reduce the size of the entire apparatus and reduce the manufacturing cost thereof.

However, since the solenoid valve of the direct control method needs to stably control the high pressure hydraulic pressure (for example, 16-25 bar), the structure of the solenoid valve has a great influence on the linear control of the hydraulic pressure, and thus the processing quality must be ensured. Needs to be.

1 is a cross-sectional view of a solenoid valve of a direct control method disclosed in Korean Patent Registration No. 10-0903834 (Patent Document 1), and FIG. 2 is an enlarged view of portion "A" of FIG.

As shown in FIG. 1, the conventional direct control solenoid valve 10 has a guide hollow portion 21 therein, and a feedback chamber 22 and a supply chamber 23 in the guide hollow portion 21. , A spool 30 having a holder 20 formed with a control chamber 24, a discharge chamber 25, and movably installed in the guide hollow 21 of the holder 20, and having one or more annular grooves 31. , And a solenoid portion 40 for moving the spool 30.

At this time, the outer peripheral surface of the holder 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, each of which is a 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 solenoid portion 40, it serves to open and close each of the ports 22a to 25a described above.

In this case, as shown in FIG. 2, the outer diameters of the first land portion 32a and the second land portion 32b around the feedback chamber 22 are different from each other (Δx), and accordingly, within the feedback chamber 22. By the area difference to which the hydraulic pressure P is applied, the feedback force acts in the direction of the second land portion 32b, the area of which is wider.

As described above, in order for the feedback pressure to be acted in one direction due to the area difference, at least one land portion 32b needs to be stepped on the outer circumferential surface of the spool 30 such that its outer diameter is larger than that of the other land portions 32a. Correspondingly, the inner circumferential surface of the holder 20 should also be stepped.

In this case, an increase in manufacturing cost due to the increase in processing cost is inevitable, and the gap between the holder 20 and the spool 30 must be accurately maintained in order to secure stable hydraulic performance. If it is not secured, there is a high possibility of failure such as a jamming phenomenon during operation.

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

The present invention has been made to solve the problems described above, one embodiment of the present invention by making the land diameter of the land portion of the spool member the same, the processing of the holder and the spool member is easy and the gap management is easy and stable It is related to solenoid valve of automatic transmission that can ensure hydraulic performance.

In addition, one embodiment of the present invention, one end of the spool member is inserted into the guide groove inside the cap member, the feedback flow path is communicated to the guide groove through the inside of the spool member, the hydraulic pressure applied to the cap member through the feedback flow path Reaction forces are associated with solenoid valves in automatic transmissions that act as feedback forces to the spool member.

In addition, an embodiment of the present invention relates to a solenoid valve of an automatic transmission, in which a filter is coupled to each port, thereby preventing foreign matter from entering into the holder.

According to a preferred embodiment of the present invention, the holder having a guide hollow portion therein, the inlet port, a control port, a discharge port, and a feedback port are spaced apart from each other in the longitudinal direction on the outer circumferential surface to communicate with the guide hollow portion; A control screw coupled to one end of the guide hollow portion; A spool member installed to be slidably movable in the guide hollow portion and having a guide part having a predetermined diameter extending from one end thereof; A cap member interposed between the adjusting screw and the spool member and having a guide groove corresponding to the guide portion of the spool member; And a driving unit installed at one side of the spool member and configured to slide the spool member by a current supply, wherein a feedback flow path communicating the feedback port and the guide groove is formed inside the spool member. A solenoid valve of an automatic transmission is provided.

Here, the feedback passage may include at least one horizontal passage extending radially from one side of the outer circumferential surface of the spool member, and a vertical passage communicating with the guide groove at one side of the horizontal passage.

In addition, it is preferable that a ring-shaped filter is coupled to at least one of the inlet port, the control port, the outlet port, and the feedback port.

In addition, a return spring is interposed between the adjusting screw and the spool member, and the cap member is preferably disposed in the return spring.

According to the solenoid valve of the automatic transmission according to an embodiment of the present invention, since the inner diameter of the holder and the outer diameter of the spool member are processed in one stage without the two-stage processing as in the prior art, the processing is easy, and concentricity management and holder during the processing It is easy to manage the clearance between the spool member and, by minimizing the mechanical locking phenomenon of the holder and the spool member, it is easy to ensure the hydraulic linearity, it is possible to prevent the occurrence of shifting and shifting shock due to product failure.

1 is a cross-sectional view of a conventional direct control solenoid valve.
FIG. 2 is an enlarged view of a portion “A” of FIG. 1. FIG.
3 is a sectional view of a solenoid valve of an automatic transmission according to an embodiment of the present invention.
4 is an enlarged view of a portion “B” of FIG. 3;

Hereinafter, a preferred embodiment of a solenoid valve of an automatic transmission 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

3 is a cross-sectional view of a solenoid valve of an automatic transmission according to an embodiment of the present invention, and FIG. 4 is an enlarged view "B" of FIG.

As shown in Figure 3, the solenoid valve (hereinafter referred to as "solenoid valve") 100 of the automatic transmission according to an embodiment of the present invention, the holder 200 having a guide hollow portion 210 therein, and Adjusting screw 300 coupled to one end of the guide hollow portion 210, the spool member 400 is installed to be slidably movable in the guide hollow portion 210, between the control screw 300 and the spool member 400 The cap member 500 is interposed therebetween, and the driving unit 700 is installed at one side of the spool member 400 to slide the spool member 400 by the current supply.

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 holder 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 foreign matter and residual pressure in the solenoid valve 100 are discharged through the discharge port 240.

On the other hand, in order to prevent foreign matter from flowing into the solenoid valve 100 to the supply port 220, the control port 230 and the feedback port 250, it is preferable that the ring-shaped filter 260 is coupled to each other, Although not shown in the drawings, the filter 260 may be coupled to the discharge port 240 to prevent the inflow of foreign substances due to back pressure.

In addition, the valve body (not shown) to which the solenoid valve 100 is mounted is formed with a connection passage (not shown) for connecting the control port 230 and the feedback port 250 to be discharged through the control port 230. Part of the control pressure is induced to flow into the feedback chamber 251 to be described later via the feedback port 250.

And, on the outer circumferential surface of the spool member 400, a plurality of land portions 410 having an expanded width are formed to be spaced apart from each other by an annular groove, and these land portions 410 are formed by the slide movement of the spool member 400. Opening and closing each port (220 ~ 250).

At this time, the space between each port 220 to 250 and the land portion 410 of the outer circumferential surface of the spool member 400 in the guide hollow portion 210 is the supply chamber 221, the control chamber 231, and the discharge chamber 241, respectively. ) And a feedback chamber 251.

At one end of the spool member 400, that is, at the center of the surface facing the adjusting screw 300, a guide portion 420 having a predetermined width extends in the direction of the adjusting screw 300, and corresponds to the guide portion 420. Cap member 500 having a guide groove 510 is interposed between the adjustment screw 300 and the spool member 400, the guide portion 420 of the spool member 400 is the guide groove of the cap member 500 ( 510 is inserted. At this time, the gap between the outer circumferential surface of the guide portion 420 and the inner circumferential surface of the guide groove 510 is preferably maintained closely.

Meanwhile, a feedback flow path 430 is formed inside the spool member 400 to connect the feedback port 250 and the guide groove 510 of the cap member 500 to each other. At least one horizontal passage 431 extends in the radial direction from the outer circumferential surface of 400, and the vertical passage 432 communicating with the guide groove 510 along the central axis of the guide portion 420 is the horizontal passage 431. It is formed extending to one side.

Therefore, as shown in FIG. 4, the control pressure introduced into the feedback chamber 251 through the feedback port 250 passes through the horizontal passage 431, the feedback passage 430, and the vertical passage 432, in turn. Guide groove 510 of the 500 is guided, wherein the control pressure in the guide groove 510 acts as a feedback force of the reaction force spool member 400 is the opposite direction of the adjustment screw 300 (lower in the drawing) Will receive feedback power. At this time, by appropriately selecting the inner diameter of the guide groove 510 and the outer diameter of the guide portion 420 of the spool member 400, the feedback force applied to the spool member 400 can be adjusted.

In addition, a return spring 600 for elastically supporting the spool member 400 in the opposite direction of the adjustment screw 300 is interposed between the adjustment screw 300 and the spool member 400, and the cap member 500 has a return spring. The return spring 600 serves as a buffer when the spool member 400 moves in the direction of the adjusting screw 300, while the return spring 600 has an elastic force in the opposite direction of the adjusting screw 300 with respect to the spool member 400. To provide.

That is, the spool member 400 is forced to return to the initial state by the elastic restoring force of the return spring 600 and the feedback pressure formed in the guide groove 510 of the cap member 500.

In this way, the control pressure is guided to the guide groove 510 of the cap member 500 to act as a feedback pressure to the guide portion 420 of the spool member 400, the land portion of the spool member 400 ( By using the area difference, a method of applying a feedback force to the spool member 400 may be excluded. Therefore, the outer diameters of the land parts 410 may be differently processed, or the inner diameters of the holders 200 may be partially changed. There is no need to process them differently.

That is, according to one embodiment of the present invention, it is not necessary to process the outer diameter of the land portion 410 differently, and correspondingly the inner diameter of the holder 200 can be processed on the same basis, the spool member 400 The processing and clearance management of the and holder 200 can be easily secured to ensure the hydraulic linearity, and when the assembly of the spool member 400 and the holder 200 can be prevented from defects caused by deviation of concentricity, stable hydraulic performance can be achieved. I can guarantee it.

On the other hand, the spool member 400 slides along the guide hollow portion 210 by the drive unit 700, and the drive unit 700 includes an armature 710 for pushing and moving the spool member 400, and an armature 710. It comprises a bobbin 720 wrapped around the outside of the coil and the coil 721 is wound on the outer circumferential surface, and a stator 730 assembled between the bobbin 720 and the armature 710, the power is supplied to the coil 721 The armature 710 moves in the direction of the spool member 400 by the magnetic field generated as it is applied. Hereinafter, the configuration of the driving unit 700 according to an embodiment of the present invention will be described in more detail.

The armature 710 having magnetic properties is disposed in close contact with the lower portion of the spool member 400. The outer circumferential surface of the armature 710 is preferably surface hardened to prevent abrasion during reciprocating movement. The 720 is arranged like a wrap, and the coil 721 is wound around the outer circumferential surface of the bobbin 720.

In addition, a stator 730 is fixedly disposed on an inner circumferential surface of the bobbin 720, and a cylindrical bushing 740 is fixed to the inner upper and lower portions of the stator 730 so that the armature 710 is operated without flow and tilt. do. The inner surface of the bushing 740 is coated with Teflon, it is preferable to minimize the problem caused by friction during the reciprocating movement of the armature 710.

At this time, the inner diameter of the bushing 740 is preferably smaller than the inner diameter of the stator 730 to ensure the side air gap between the armature 710 and the stator 730.

In addition, a core 750 is installed between the lower end of the holder 200 and the upper end of the bobbin 720. The core 750 is composed of a donut-shaped support 751 having a hole formed at the center thereof, and a coupling part 752 protruding downwardly around the hole of the support 751.

Here, the support portion 751 of the core 750 is in close contact with the lower end of the holder 200, the coupling portion 752 is inserted and fixed inside the bobbin 720, the coupling portion 752 of the bobbin 720 When inserted and fixed inside, a tube 760 is interposed between the inner circumferential surface of the bobbin 720 and the outer circumferential surface of the engaging portion 752. At this time, the tube 760 is interposed between the bobbin 720 and the core 750, and between the bobbin 720 and the stator 730, and serves to prevent the flow of the core 750 and the stator 730. , Tube 760 is preferably made of a non-magnetic metal material.

The housing 770 is coupled to the lower portion of the holder 200 to surround the outer side of the coil 721 wound on the bobbin 720 and the lower portion of the stator 730. The connector guide 780 is coupled to an outer surface of the lower end of the housing 770 so as to connect an external power source.

In addition, a seating groove 711 is formed at the lower end of the armature 710, the stopper 790 is fitted to the seating groove 711, the stopper 790 is a seating groove (protruding than the bottom surface of the armature 710) It is formed larger than the depth of the 711, and is in contact with the bottom surface of the lower end of the housing 770.

Here, the stopper 790 is a nonmagnetic metal material to prevent the armature 710 from sticking to the bottom surface of the housing 770.

Operation of the solenoid valve according to an embodiment of the present invention is performed as follows.

First, when power is applied to the coil 721 side, a magnetic force is generated and the armature 710 moves upward on the drawing to slide the spool member 400. At this time, the supply chamber 221 and the control chamber 231 communicate with the land portion 410 of the spool member 400 to increase the control pressure in the control chamber 231.

The control pressure thus increased is introduced into the feedback chamber 251 through the feedback port 250 through the connection flow path of the valve body, and enters the guide groove 510 of the cap member 500 through the feedback flow path 430. Acts as feedback pressure at the end of 420.

Accordingly, as the feedback force and the elastic force of the return spring 600 are applied to the spool member 400 in the direction opposite to the force applied to the spool member 400 by the magnetic force, the balance between these forces is used. Pressure control can be achieved.

100: solenoid valve
200: holder 210: guide hollow
220: supply port 230: control port
240: discharge port 250: feedback port
260 filter
300: adjusting screw
400: spool member 410: land portion
420: guide unit 430: feedback euro
500: cap member 510: guide groove
600: return spring
700: driving unit 710: amateur
720: bobbin 730: stator
740: bushing 750: core
760: tube 770: housing
780: connector guide 790: stopper

Claims (4)

A holder having a guide hollow inside and having a supply port, a control port, a discharge port, and a feedback port spaced apart from each other in the longitudinal direction on the outer circumferential surface to communicate with the guide hollow part;
A control screw coupled to one end of the guide hollow portion;
A spool member installed to be slidably movable in the guide hollow portion and having a guide part having a predetermined diameter extending from one end thereof;
A cap member interposed between the adjusting screw and the spool member and having a guide groove corresponding to the guide portion of the spool member; And
Is installed on one side of the spool member, including a drive unit for sliding the spool member by the current supply,
A solenoid valve of an automatic transmission, characterized in that a feedback flow path communicating with the feedback port and the guide groove is formed inside the spool member.
The method of claim 1, wherein the feedback channel,
Solenoid valve of the automatic transmission, characterized in that it comprises at least one horizontal passage extending radially from one side of the outer circumferential surface of the spool member, and a vertical passage communicating with the guide groove on one side of the horizontal passage.
The method according to claim 1,
Solenoid valve of the automatic transmission, characterized in that the ring-shaped filter is coupled to at least one of the supply port, the control port, the discharge port, and the feedback port.
The method according to claim 1,
A return spring is interposed between the adjusting screw and the spool member, and the cap member is disposed in the return spring.

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