JP6701823B2 - Solenoid valve device - Google Patents

Description

  The present invention relates to a solenoid valve device suitable for use as, for example, a control valve of an automobile transmission.

  A control valve for controlling a speed change mechanism is provided in an automatic transmission of a vehicle. This control valve controls the speed change mechanism by supplying and stopping a predetermined amount of hydraulic pressure to the speed change mechanism using an electromagnetic valve device.

  Conventionally, as one of the electromagnetic valve devices of this type, there is one in which a spool valve is reciprocally moved by a plunger, as shown in Patent Document 1 and Patent Document 2. In this type of solenoid valve device, a coil and a stator core are coaxially arranged in a bottomed metal case with one end opened, and a plunger inserted in the center of the stator core is reciprocated by a magnetic force generated by the coil. The plunger pushes a pin arranged on its coaxial extension, and the tip of this pin pushes the spool valve, whereby the spool valve moves.

  In this type of solenoid valve device, a magnetic circuit passing through the metal case and a stator core provided inside is formed, and at this time, the bottom of the metal case functions as a yoke portion of the magnetic circuit. However, since the metal case is generally manufactured by pressing a thin metal plate into a cup shape by drawing, as compared with the stator core, the metal case has a small cross-sectional area and a large magnetic resistance. In order to improve this, in Patent Document 2, an annular core is arranged at the bottom of the metal case, and the annular core is brought into contact with the stator core, thereby increasing the cross-sectional area of the yoke and increasing the magnetic resistance. It is decreasing.

JP, 2009-275899, A JP, 2005-75165, A

  However, since the technique of Patent Document 2 presses the annular core against the inner surface of the bottom of the metal case with the wave washer arranged between the coil and the annular core, the annular washer is changed by the fluctuation of the spring force of the wave washer. There is a problem that the surface contact between the core and the bottom of the metal case becomes unstable and the magnetic attraction force fluctuates.

  An object of the present invention is to provide a solenoid valve device capable of maintaining sufficient surface contact between the stator core, the annular core and the bottom of the metal case and allowing a magnetic flux to flow efficiently.

The solenoid valve device of the present invention is characterized by having the following configuration. (1) A case having a bottomed tubular shape made of a magnetic material, the case having an opening on one side in the axial direction, and a caulking portion whose inner edge facing the opening is bent inward, and (2) a case A cylindrical coil bobbin that is disposed coaxially with the cylindrical case, has a through hole that penetrates from one side to the other side in the axial direction, and has both ends open, and (3) a coil wound around the outer circumference of the coil bobbin. (4) A cylindrical stator core that is made of a magnetic material, is disposed inside the coil bobbin coaxially with the coil bobbin, and has a through hole that penetrates in the axial direction, and (5) is made of a magnetic material and has the through hole. A plunger arranged coaxially with the stator core and movable in the axial direction, and (6) an annular core made of a magnetic material and arranged between the bottom surface of the case and the stator core. (7) A valve that is opened/closed by axial movement of the plunger due to excitation of the coil, and (8) the annular core and the stator core are sandwiched and fixed between the bottom of the case and the caulking portion. (9) Further, a step portion with which an end portion of the stator core engages is provided on a surface of the annular core facing the stator core, and (10) the annular core engages with the step portion. Positioning is performed in the radial direction by the end portion of the stator core.

In the present invention, it is not essential, but the following configurations are preferable.

(1) A circular plunger insertion hole penetrating in the axial direction is provided coaxially with the annular core at the center of the annular core, and the inner diameter of the plunger insertion hole is slightly larger than the outer diameter of the plunger.
The step portion of the annular core is provided coaxially with the plunger insertion hole around the plunger insertion hole,
The step portion of the annular core comprises an axial end surface having a small axial thickness of the annular core and an inner wall having a diameter larger than the hole diameter of the through hole,
The inner diameter of the inner wall coincides with the inner diameter of the through hole formed in the bobbin.

(2) A pin guide core arranged between the opening of the case and the stator core,
In the same direction as the central axis of the plunger, a guide hole provided in the pin guide core,
Comprises a columnar pin reciprocally inserted in the guide hole,
The other axial side of the pin contacts one axial side of the plunger, and the one axial side of the pin contacts the valve,
The annular core and the stator core are fixed by being sandwiched between the bottom portion of the case and the caulking portion via the pin guide core.

(3) A non-magnetic member is interposed between the stator core and the pin guide core to divert a magnetic path generated between the stator core and the pin guide core to the plunger side.

(4) The non-magnetic member is a cylindrical member having the same outer diameter as the stator core and the same central axis as the stator core,
Step portions having a smaller outer diameter than the outer circumferences and the same outer diameter are formed at respective opposing end portions of the stator core and the pin guide core,
Both ends of the non-magnetic member are fitted in the stepped portions of the stator core and the pin guide core, and the axial position is regulated by these stepped portions.

(5) A flange portion is provided at an end portion of the pin guide core on the case opening side side, and the other side in the axial direction is in contact with one end side in the axial direction of the coil bobbin.
The coil bobbin and the stator core are tightly held between the bottom portion of the case and the caulking portion via the pin guide core.

(6) A plunger insertion hole penetrating in the axial direction is provided in the center of the annular core, and the inner diameter of the plunger insertion hole is larger than the outer diameter of the plunger and the inner diameter of the through hole of the stator core.

  According to the present invention, it is possible to provide a solenoid valve device capable of maintaining sufficient surface contact between the stator core, the annular core, and the bottom of the metal case, and allowing the magnetic flux to flow efficiently.

FIG. 1 is a vertical sectional view of the first embodiment. FIG. 2 is an enlarged cross-sectional view of the plunger portion in the first embodiment. FIG. 3 is an enlarged cross-sectional view of the plunger portion in the second embodiment. FIG. 4 is an enlarged cross-sectional view illustrating the operation of the second embodiment. FIG. 5 is an enlarged cross-sectional view of the plunger portion in the third embodiment. FIG. 6 is a cross-sectional view showing another embodiment.

[1. First Embodiment]
[1.1 Configuration]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the present embodiment, the axis means the central axis along the longitudinal direction of the spool valve, and when simply referred to as the circumferential direction or the axial direction, it means the circumferential direction of the central axis or the axial direction of the central axis.

The solenoid valve device of the present embodiment includes a spool valve portion A and a plunger portion B.
The spool valve portion A has a cylindrical sleeve 1 and a spool valve 2 which is slidably inserted in the inside thereof. The sleeve 1 is provided with a plurality of ports 3 so as to penetrate the wall surface thereof. The spool valve 2 is provided with a valve body 4 that opens and closes the port 3. A flange 5 is provided at an end portion of the sleeve 1 on the side of the plunger portion B, and the flange 5 is pressed by a caulking portion 7 provided on a case 6 of the plunger portion B, so that the spool valve portion A becomes a plunger portion. It is fixed to B. A cap 8 is provided at an end of the sleeve 1 opposite to the plunger B, and a coil spring 9 is inserted between the cap 8 and the end of the spool valve 2.

  The plunger part B has a bottomed cylindrical case 6 made of a magnetic material. The case 6 has a caulking portion 7 which is open on one side in the axial direction and whose peripheral edge facing the opening is bent inward. Inside the case 6, a coil bobbin 10 is arranged coaxially with the case 6. The coil bobbin 10 has a through hole that is open at both ends and that penetrates from one side in the axial direction to the other side. A coil 12 is wound around the outer circumference of the coil bobbin 10. The coil bobbin 10 is formed of a resin molded product. Flanges are provided at both ends of the wound portion of the coil 12 in the coil bobbin 10, and the connector 11 exposed to the outside of the case 6 is integrally formed with the flange on one axial side.

  A cylindrical stator core 13 is arranged coaxially with the coil bobbin 10 in the through hole of the coil bobbin 10. The stator core 13 is made of a magnetic material and has a through hole penetrating in the axial direction. Plunger 15 is arranged inside the through hole of stator core 13. The plunger 15 is made of a magnetic material and is arranged coaxially with the stator core 13 and movable in the axial direction. An annular core 16 made of a magnetic material is arranged between the bottom surface of the case 6 and the stator core 13. The corner portion between the inner surface of the case 6 and the inner surface of the bottom has a curved R shape, and the radially outer peripheral surface of the annular core 16 does not reach the inner surface of the R shaped case 6. That is, the diameter of the annular core 16 is large enough to fit in the flat portion of the bottom of the case 6.

  A step portion 17 with which an end portion of the stator core 13 is engaged is provided on a surface of the annular core 16 facing the stator core 13. The annular core 16 is positioned in the radial direction by the end portion of the stator core 13 that engages with the step portion 17. At the center of the annular core 16, a circular plunger insertion hole 18 penetrating in the axial direction is provided coaxially with the annular core 16. The inner diameter of the plunger insertion hole 18 is slightly larger than the outer diameter of the plunger 15, and does not contact the outer peripheral surface of the plunger 15.

  The step portion 17 of the annular core 16 is provided around the plunger insertion hole 18 and coaxially with the plunger insertion hole 18. The step portion 17 includes an axial end surface of the annular core 16 having a small axial thickness and an inner wall having a diameter larger than the hole diameter of the through hole, and the inner diameter of the inner wall is the inner diameter of the through hole provided in the coil bobbin 10. Is consistent with

  The pin guide core 19 is arranged between the opening of the case 6 and the stator core 13. The pin guide core 19 and the stator core 13 are arranged apart from each other without making contact with each other. A guide hole is provided in the pin guide core 19 in the same direction as the center axis of the plunger 15. A columnar push pin 21 is reciprocally inserted into the guide hole. The other axial side of the push pin 21 contacts one axial side of the plunger 15, and the one axial side of the push pin 21 contacts the spool valve 2 and presses the spool valve 2.

  A non-magnetic member 22 is interposed between the stator core 13 and the pin guide core 19 to divert a magnetic path generated between the stator core 13 and the pin guide core 19 to the plunger 15 side. The non-magnetic member 22 is, for example, a metal such as stainless steel or aluminum or a hard resin, and is a cylindrical member having the same outer diameter as the stator core 13 and the same central axis as the stator core 13. Step portions 23 having a smaller outer diameter than the outer circumferences and the same outer diameter are formed at the opposing ends of the stator core 13 and the pin guide core 19. Both ends of the non-magnetic member 22 are fitted into the step portions 23 of the stator core 13 and the pin guide core 19, and the axial portions and the circumferential position of the non-magnetic member 22 are regulated by these step portions 23.

  The end portion of the pin guide core 19 on the opening side of the case 6 is provided with a flange portion 24, the other side of which is in contact with one end side of the coil bobbin 10 in the axial direction. The flange portion 24 is overlapped with the flange 5 of the spool valve portion A, is in contact with one end in the axial direction of the bobbin, and is pressed against the bottom portion side of the case 6 by the caulking portion 7.

[1.2 Action/effect]
The effects of the first embodiment having the above-described configuration are as follows.
(1) The pressing force of the caulking portion 7 is transmitted to the annular core 16 in the order of the flange 5, the pin guide core 19, the non-magnetic member 22, and the stator core 13, and the annular core 16 is brought into close contact with the bottom portion of the case 6. At the same time, the pressing force of the caulking portion 7 is transmitted to the annular core 16 in the order of the flange 5, the pin guide core 19, and the coil bobbin 10, and these members are brought into close contact with the bottom of the case 6. As a result, the surface contact between the annular core 16 and the bottom surface of the case 6 is stably maintained, the loss of the magnetic circuit is reduced, and the attractive force of the plunger 15 is improved.

(2) Since the cylindrical non-magnetic member 22 is combined with the stator core 13 and the pin guide core 19 by the step portion 23, the stator core 13, the non-magnetic member 22, and the pin guide core 19 can be reliably positioned in the circumferential direction and the axial direction. Is done. As a result, the caulking force of the opening of the case 6 can be reliably received, the close contact between the annular core 16 and the stator core 13 and between the annular core 16 and the bottom of the case 6 is enhanced, and leakage of magnetic flux is eliminated.

(3) Since the contact area between the stator core 13 and the annular core 16 is increased by the step portion 17, the loss of magnetic flux is reduced and the magnetic flux can be reliably transferred to the bottom portion of the case 6.
(4) By providing the non-magnetic member 22 between the stator core 13 and the pin guide core 19, the magnetic path always passes through the plunger 15, and the magnetic force generated by the coil 12 efficiently acts on the plunger 15.

(5) Since the plunger 15 is inserted into the plunger insertion hole 18 at the center of the annular core 16, even if the annular core 16 is at the bottom of the case 6, the stroke of the plunger 15 can be secured and the annular core 16 The size can be reduced by the thickness.
(6) The outer peripheral surface of the annular magnetic core in the radial direction does not reach the case 6, and the workability of storing the annular magnetic core in the case 6 is good, and the number of processing steps and assembly steps can be suppressed.

(7) Since the annular core 16 and the coil bobbin 10 are brought into contact with each other and the pressing force of the caulking portion 7 is transmitted from the coil bobbin 10 to the annular core 16, the axial positioning of the coil bobbin 10 is also accurate.
(8) Since the corners between the inner surface of the case 6 and the inner surface of the bottom are R-shaped, the outer circumferential surface of the annular magnetic core in the radial direction does not reach the inner surface of the case 6, so that the bottom surface side does not float. Adhesion between the annular magnetic core and the bottom surface of the case 6 can be maintained.

[2. Second Embodiment]
The second embodiment will be described with reference to FIGS. 3 and 4. In the second embodiment, as shown in FIG. 3, when the inner diameter of the plunger insertion hole 18 is sufficiently larger than the outer diameter of the plunger 15 and the plunger 15 is inserted inside the annular core 16, A gap 25 is formed between it and the plunger insertion hole 18.

  In the first embodiment, as shown in FIG. 4A, the inner diameter of the plunger insertion hole 18 provided in the annular core is slightly larger than the outer shape of the plunger 15 so that the plunger 15 can move. On the other hand, in the second embodiment, as shown in FIG. 4B, the inner diameter of the plunger insertion hole 18 is sufficiently larger than the outer diameter of the plunger 15. Therefore, in the second embodiment, in addition to the effects of the first embodiment, when the plunger 15 appears and disappears in the plunger insertion hole 18, the end of the plunger 15 and the edge of the plunger insertion hole 18 do not come into contact with each other. The advantage is that the stroke of the plunger 15 is sufficiently secured.

[3. Third Embodiment]
The third embodiment will be described with reference to FIG. The third embodiment has a configuration in which the annular core 16 is not provided with the step portion 17. The stator core 13 is in contact with the surface of the annular core 16 at the other end in the axial direction. The annular core 16 and the bottom of the case 6, the annular core 16 and the stator core 13, or the annular core 16 and the coil bobbin 10 are fixed with an adhesive, or the annular core 16 and the bottom of the case 6 or the annular core 16 and the coil bobbin 10 are fixed. When the annular core 16 can be positioned in the circumferential direction by providing the positioning step and the unevenness on and, the step 17 may not be provided on the annular core 16.

  Also in the third embodiment, the pressing force of the caulking portion 7 is transmitted to the annular core 16 via the stator core 13, so that the adhesion between the annular core 16 and the bottom of the case 6 can be ensured, and the efficiency can be improved. Magnetic circuit can be obtained.

[4. Other Embodiments]
The present invention is not limited to the above embodiment. The above embodiment is presented as an example, and can be implemented in various other forms. Various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope of the invention, the gist, and the scope of equivalents thereof. An example will be shown below.

(1) The stator core 13, the non-magnetic member 22, and the pin guide core 19 may be positioned by simple butting, adhesive welding, molding with a resin member, or the like.
(2) The crimping portion 7 of the case 6 does not have to crimp the pin guide core 19 or the sleeve 1, and the crimping portion 7 of the case 6 may directly press the stator core 13.
(3) A step 17 may be provided on the bottom side of the case 6 to position the annular core 16 in the circumferential direction.

(4) In each of the above-described embodiments, the step portion 17 has a shape that holds the stator core 13 from the outside as shown in FIG. 6A. However, as shown in FIG. 6B, the step portion 17 of the annular core 16 is It may enter inside the stator core 13.

A... Spool valve part, B... Plunger part, 1... Sleeve, 2... Spool valve, 3... Port, 4... Valve body, 5... Flange, 6... Case, 7... Crimping part, 8... Cap, 9... Coil Spring, 10... Coil bobbin, 11... Connector, 12... Coil, 13... Stator core, 15... Plunger, 16... Annular core, 17... Step portion, 18... Plunger insertion hole, 19... Pin guide core, 21... Push pin, 22... Non-magnetic member, 23... Step, 24... Flange, 25... Gap

Claims (7)

A bottomed cylindrical case made of a magnetic material, the case having an opening on one side in the axial direction, and a crimping part whose inner edge is bent inward,
A cylindrical coil bobbin disposed inside the case coaxially with the case, having a through hole penetrating from one side in the axial direction to the other side, and having both ends open.
A coil wound around the outer circumference of the coil bobbin,
A tubular stator core made of a magnetic material, arranged inside the coil bobbin coaxially with the coil bobbin, and having a through hole penetrating in the axial direction,
A plunger that is made of a magnetic material and that is arranged coaxially with the stator core and axially movable inside the through hole;
An annular core made of a magnetic material and arranged between the bottom surface of the case and the stator core,
A valve that opens and closes due to axial movement of the plunger due to excitation of the coil,
The annular core and the stator core are fixed by being sandwiched between the bottom portion of the case and the caulking portion ,
A surface of the annular core facing the stator core is provided with a step portion with which an end of the stator core is engaged.
The annular core is an electromagnetic valve device in which radial positioning is performed by an end portion of a stator core that engages with the step portion . In the center of the annular core, a circular plunger insertion hole penetrating in the axial direction is provided coaxially with the annular core, the inner diameter of the plunger insertion hole is slightly larger than the plunger outer diameter,
The step portion of the annular core is provided coaxially with the plunger insertion hole around the plunger insertion hole,
The step portion of the annular core comprises an axial end surface having a small axial thickness of the annular core and an inner wall having a diameter larger than the hole diameter of the through hole,
The solenoid valve device according to claim 1 , wherein an inner diameter of the inner wall matches an inner diameter of a through hole formed in the bobbin. A pin guide core arranged between the opening of the case and the stator core;
In the same direction as the central axis of the plunger, a guide hole provided in the pin guide core,
Comprises a columnar pin reciprocally inserted in the guide hole,
The other axial side of the pin contacts one axial side of the plunger, and the one axial side of the pin contacts the valve,
It said annular core and the stator core, the pin guide through the core, the solenoid valve device according to claim 1 or claim 2 which have been fixed sandwiched between the bottom and the caulking portion of the case. The solenoid valve according to claim 3 , wherein a non-magnetic member is interposed between the stator core and the pin guide core to divert a magnetic path generated between the stator core and the pin guide core to the plunger side. apparatus. The non-magnetic member is a cylindrical member having the same outer diameter as the stator core and the same central axis as the stator core,
Stepped portions having a smaller outer diameter and the same outer diameter than the outer circumferences of the stator core and the pin guide core are formed at opposing ends of the stator core and the pin guide core.
The electromagnetic valve device according to claim 4 , wherein both ends of the non-magnetic member are fitted in stepped portions of the stator core and the pin guide core, and the axial positions are regulated by these stepped portions. An end portion of the pin guide core on the case opening side is provided with a flange portion, the other side of which is in contact with one end side of the coil bobbin in the axial direction,
The solenoid valve device according to claim 5 , wherein the coil bobbin and the stator core are closely held between a bottom portion of the case and the caulking portion via the pin guide core. In the center of the annular core is provided with a plunger insertion hole penetrating in the axial direction, the inner diameter of the plunger insertion hole, the plunger outer peripheral diameter and an inner diameter larger than the claims of the through hole of the stator core 1 or claim 2 The solenoid valve device described.

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