JP2003314731A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve in which the number of its part items is reduced to improve productivity. <P>SOLUTION: In the solenoid valve 1, a magnetic drive part 20 is disposed at one end of a valve element 10 in which a movable spool 16 is housed in a sleeve 12 so that the magnetic drive part 20 displaces the position of the movable spool 16. A plunger 33 is axially displaced in a core 21 and a case 27 depending on a current value of an exiting coil 25, a part of an outer circumferential face of the plunger 33 faces a part of an inner circumferential face of a bobbin part 23. A projection (bearing part 23a) approximately in contact with a part of an outer circumferential face of a movable member toward an inner radial direction in a part of the inner circumferential face of the bobbin part facing the plunger 33 is continuously or intermittently disposed with respect to an inner periphery. Therefore, at least two parts, that is, the bearing member 31 and the projection (bearing part 23a) bear the plunger 33. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve that displaces the position of a spool housed in a sleeve by exciting a coil.

[0002]

2. Description of the Related Art A solenoid valve is provided, for example, in an automatic transmission or the like mounted on a vehicle, and the solenoid valve is used to switch the hydraulic path used for gear shifting and control the pressure of hydraulic oil. . As this type of solenoid valve, for example, a solenoid valve 2 as shown in FIG. 5 is used. FIG. 5 shows a sectional view of a conventional solenoid valve 2. The conventional solenoid valve 2 has a valve body portion 60.
And a magnetic drive unit 70 provided at one end of the valve body 60.
It consists of and. The magnetic drive unit 70 includes a solenoid portion (a member in which an exciting coil 75 is wound around a cylindrical bobbin portion 73 and is covered with a mold member 76 having an insulating property), and a part of the solenoid portion from one axial direction is the solenoid portion. A core 71 inserted into the inner circumference of the solenoid, a case 77 integrated with a yoke part of which is inserted into the inner circumference of the solenoid from the other axial direction of the solenoid, and a connector connected to the exciting coil 75. 79 and the plunger 83 to which the shaft 84 is fixed. There are some gaps between the outer peripheral surface of the plunger 83 and the inner peripheral surface of the case 77, and between the outer peripheral surface of the plunger 83 and the inner peripheral surface of the core 71.
The plunger 83 is configured to be movable in the axial direction inside the core 71 and the case 77.

The core 71 has a tubular portion (portion inserted along the inner wall of the solenoid portion) inserted from one axial direction of the solenoid portion and a predetermined portion when the tubular portion is inserted into the solenoid portion. It has a core flange portion 71a that comes into contact with the step portion 77d of the case 77 at a position, and the tubular portion and the core flange portion 71a are formed coaxially. Further, the core 71 is provided with a through hole in the axial direction for inserting the shaft 84 therethrough. Also, in the through hole,
The bush 80 (bearing member) is press-fitted. In addition, the core 71 has a stopper 82 for limiting the axial movement distance.
Is provided. The case 77 includes an inner tubular portion (a portion that is inserted along the inner wall of the solenoid portion) inserted from the other axial direction of the solenoid portion, an outer tubular portion (a portion that covers the outer wall of the solenoid portion), and Core flange 71a
And a stepped portion 77d that abuts with the stepped portion 77d. The inner tubular portion, the outer tubular portion, and the stepped portion 77d are coaxially formed. Further, the case 77 is provided with a bottomed hole in the axial direction for inserting the plunger 83 therethrough. A bush 81 (bearing member) is press-fitted into the bottomed hole.

A shaft 84 is press-fitted into the plunger 83, and the shaft 84 is rotatably supported by a bush 80 provided on the core 71 and a bush 81 provided on the case 77, so that the shaft 84 can be smoothly moved in the axial direction. Is. The solenoid portion includes a cylindrical bobbin portion 73 and an exciting coil 75.
And a molding member 76 that covers the surface of the exciting coil 75.
And a connector portion 79 for energizing the exciting coil 75. Also, the solenoid part is a case 77.
And is housed inside the gap formed by the core 71.
Therefore, a buffer member 85 made of an elastic material or the like is provided between the solenoid portion and the core flange portion 71a to prevent the solenoid portion from rattling.

The valve body 60 includes a sleeve 62 and a spool 66 housed in a spool sliding hole in the sleeve 62.
It consists of and. The sleeve 62 is provided at one end thereof with a sleeve flange portion 62a having substantially the same outer diameter as the core flange portion 71a of the core 71. The sleeve flange portion 62a is brought into contact with the core flange portion 71a, and the opening end of the case 77 is bent (caulked) inwardly, so that the sleeve flange portion 62a is caulked to the case 77, and the sleeve portion 62a is connected to the solenoid portion. The core 71
It is fixed in the case 77. Further, the spool 66 is arranged coaxially with the shaft 84, and one end thereof is in contact with the shaft 84. A spring 68 is provided at the other end of the spool 66, and the spring 68 constantly biases the spool 66 toward the magnetic drive unit 70. The other end of the spring 68 is fixed by the plug 64.

[0006]

In the conventional solenoid valve 2,
The plunger 83 having the shaft 84 press-fitted therein is supported by two bushes (bushes 80, 81) for the purpose of smooth movement in the axial direction and suppression of misalignment. As a result, variations such as hysteresis are reduced, responsiveness is improved, and the characteristics of the solenoid valve 2 are stabilized. However, since the number of parts is large, the management work (accuracy management, inventory management, etc.) of each part is large, and the work amount of the assembling work is large, so that it is relatively difficult to further improve the productivity. The present invention has been devised in view of the above point, and an object thereof is to provide a solenoid valve that can reduce the number of parts and further improve productivity.

[0007]

As a means for solving the above-mentioned problems, the first invention of the present invention is a solenoid valve as described in claim 1. In the solenoid valve according to claim 1, in a part of the inner peripheral surface of the bobbin portion facing the movable member (plunger or the like), a protrusion that substantially abuts the outer peripheral surface of the part of the movable member in the inner radial direction. Parts are provided continuously or intermittently. Since the convex portion is provided on the inner circumference of the bobbin portion of the solenoid portion, it can be integrally formed with the bobbin portion. Therefore, since the convex portion is not formed on an independent bearing member (such as a bush) but is formed on the solenoid portion in advance, the number of parts can be reduced (in this case, the number of bushes can be reduced). Productivity can be improved.

A second aspect of the present invention is a solenoid valve as set forth in claim 2. The electromagnetic valve according to claim 2, further comprising a bearing member (a bush or the like) that substantially abuts a part of the outer peripheral surface of the movable member (a plunger or the like) that the convex portion does not abut on the outer peripheral surface of the movable member. , Bearings are provided at at least two places, the bearing member and the convex portion. This makes it possible to stabilize the characteristics of the solenoid valve by performing smooth axial movement, suppressing misalignment, etc., as in the conventional case.

A third aspect of the present invention is a solenoid valve as set forth in claim 3. In the solenoid valve according to the third aspect, the movable member is the plunger, the plunger directly displaces the spool, and not the shaft. Therefore, the shaft becomes unnecessary, the number of parts can be reduced, and the productivity can be further improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a schematic structure of an embodiment of a solenoid valve of the present invention. First, the solenoid valve 1 of the present embodiment shown in FIG. 1 and the conventional solenoid valve 2 shown in FIG.
The difference from the above will be outlined in the following (1) to (4). (1) In FIG. 5, the bush 80 bears the shaft 84, but in FIG. 1, instead of the bush, the bobbin portion 2 is used.
The bearing portion 23a of No. 3 is not the shaft but the plunger 33.
Bearings. (Reduce Bushing) (2) In FIG. 5, the bush 81 bears the shaft 84, but in FIG. 1, the bush 31 bears the plunger 33 instead of the shaft. (3) Due to the above (1) and (2), the shaft 84 of FIG.
However, it is reduced in FIG. (4) In FIG. 5, since the strength of the bobbin portion 73 is relatively low, the core 71 is fixed to the step portion 77d of the case 77, and the bobbin portion 73 is housed in the gap between the case 77 and the core 71. A cushioning member 85 is provided between the stepped portion 7 of the case 77 and the core member 71.
7d). However, in FIG.
The strength of the bobbin 23 is relatively high,
The cushioning member 85 is eliminated by sandwiching it between the core 7 and the core 21 for pressure contact (the bobbin portion 23 positions the core 21).

Hereinafter, the solenoid valve 1 of the present embodiment shown in FIG.
Will be described in order. As shown in FIG. 1, the solenoid valve 1
Is composed of a valve body portion 10 and a magnetic drive portion 20 provided at one end of the valve body portion 10. [Structure of Magnetic Drive Unit] The magnetic drive unit 20 includes a solenoid portion having a cylindrical bobbin portion 23, an exciting coil 25 provided on the outer periphery of the bobbin portion 23, a molding member 26, and a connector portion 29. A core 21 (core member) having a first tubular portion partially inserted in the inner circumference of the solenoid portion from one axial direction of the solenoid portion, and a solenoid portion partially from the other axial direction of the solenoid portion. At least a case 27 (case member) having a second tubular portion inserted into the inner periphery of the cylinder and a cylindrical or cylindrical plunger 33 (movable member) provided substantially coaxially with the solenoid portion are provided. There is. Between the outer peripheral surface of the plunger 33 and the inner peripheral surface of the second tubular portion of the case 27 facing the outer peripheral surface, and the outer peripheral surface of the spool 16 and the inner peripheral surface of the core 21 facing the outer peripheral surface. There is a small gap between the two
Is configured to be movable in the axial direction of the core 21 and the case 27.

The core 21 (core member) includes a first tubular portion (portion inserted along the inner wall of the solenoid portion) inserted from one axial direction of the solenoid portion, and the first tubular portion is a solenoid. Core flange portion 21 that comes into contact with one axial end surface of the solenoid portion at a predetermined position when inserted into the portion
a (first flange portion), the first tubular portion and the core flange portion 21a are formed coaxially. Further, the core 21 is provided with a through hole in the axial direction for inserting the spool 16. In the conventional solenoid valve 2, a bush (bearing member) is provided in the through hole,
In the present embodiment, no bush (bearing member) is used at this position (the through hole). The material of the core 21 is, for example, a metal having magnetic properties (iron, etc.).

The case 27 (case member) has a second cylindrical portion (a portion inserted along the inner wall of the solenoid portion) inserted from the other axial direction of the solenoid portion, and the second cylindrical portion is a solenoid. And a case flange portion 27a (second flange portion) that comes into contact with the other axial end surface of the solenoid portion at a predetermined position when inserted into the portion, and the second tubular portion and the case flange portion 27a are It is formed coaxially. Further, the case 27 is provided with a through hole in the axial direction for inserting the plunger 33 therethrough. The bush 31 is press-fitted into the through hole to prevent rattling of the plunger 33 (rattle in the direction perpendicular to the axial direction) and to suppress misalignment to stabilize the characteristics of the solenoid valve 1. ing. When the core 33 is displaced and the plunger 33 is displaced in the direction perpendicular to the axial direction, the attractive force of the exciting coil 25 acts not only in the axial direction but also in the direction perpendicular to the axial direction. In this case, the amount of displacement of the plunger 33 in the axial direction may be reduced, hysteresis may be increased, responsiveness may be decreased, and the characteristics may become unstable. Further, the case 27 is provided with a cap 28, and the plunger 3
3 limits the moving distance in the axial direction. The material of the case 27 is, for example, a metal having magnetic properties (iron, etc.).
Is used.

The solenoid portion includes a cylindrical bobbin portion 23,
The exciting coil 25 and the mold member 26 are coaxially provided, and the connector portion 2 for energizing the exciting coil 25 is provided.
9 is provided. Next, the structure of the solenoid portion will be described with reference to FIGS. Note that FIG.
(A)-(c) is the figure which cut a part for explanation. The bobbin portion 23 is provided with a bobbin flange portion 23b that limits the range in which the exciting coil 25 is provided at each open end (FIG. 3A). The exciting coil 25 is formed by winding a very fine conductor wire around the bobbin portion 23 and between the bobbin flange portions 23b (FIG. 3).
(B)). In addition, the bobbin portion 23 has a plunger 33.
On a portion of the inner peripheral surface facing the (movable member), a convex portion (bearing portion 23a) that is substantially in contact with the outer peripheral surface of a portion of the plunger 33 in the inner radial direction is continuous with the inner periphery. Alternatively, they are provided intermittently (FIG. 3 (a)-
(C)).

Since the bobbin portion 23 is sandwiched between the core 21 and the case 27 and subjected to an axial stress load, a relatively high strength is required, and the bearing portion 23a bears the plunger 33. High accuracy is required. Further, since the exciting coil 25 is in contact, it is required to be a member having an insulating property and a non-magnetic property in order to generate a magnetic field in the gap between the core 21 and the case 27. In order to satisfy all these requirements,
As the material of the bobbin portion 23, for example, PPS resin or the like is used. Further, the mold member 26 is made of a resin or the like having an insulating property, and in the bobbin portion 23 provided with the exciting coil 25, has a predetermined width in the radial direction (direction perpendicular to the axis) of the bobbin portion 23. It is formed on the outer circumference of the bobbin flange portion 23b and the outer circumference of the exciting coil 25 (FIG. 3).
(C)).

The plunger 33 has a cylindrical or columnar shape, and as shown in FIG.
It is supported by a bush 31 provided on the case 27, and a part of another outer peripheral surface is supported by a bearing portion 23 a provided on the bobbin portion 23. By bearing at least two locations (two locations are preferably separated from each other in the axial direction), the movement of the plunger 33 in the axial direction is smoothed and the core is displaced (the case 27, the bobbin portion 23, the core 2).
1. The deviation of the center position of the plunger 33) is suppressed. Further, the plunger 33 is provided with, for example, a press-fitted stopper 32 in a through hole penetrating its axis, and at a position where the plunger 33 contacts the stopper 32 (a center line indicated by a chain line in FIG. 1). Between the left side) and the position (the right side) where the plunger 33 contacts the cap 28 (the right side). As the material of the plunger 33, for example, a metal having magnetic characteristics (iron or the like) is used. The stopper 32 may be omitted.

[Structure of Valve Body] As shown in FIG. 1, the valve body 10 is composed of a sleeve 12 and a spool 16 housed in a spool sliding hole in the sleeve 12. The sleeve 12 is provided at one end thereof with a sleeve flange portion 12a having substantially the same outer diameter as the core flange portion 21a of the core 21. With the sleeve flange portion 12a in contact with the core flange portion 21a, the opening end of the case 27 on the side of the core 21 is bent (caulked) inward so that the sleeve flange portion 12a is covered with the case 27.
The sleeve 12 is fixed by being caulked. Then, the sleeve flange portion 12 a is caulked to fix the solenoid portion and the core 21 in the case 27. The material of the case 27 is, for example, a metal (iron or the like) having magnetic characteristics.

The spool 16 is arranged substantially coaxially with the plunger 33, and one end of the spool 16 is in contact with the plunger 33. The spring 1 is attached to the other end of the spool 16.
8 is provided, and the spool 18 is constantly biased toward the magnetic drive unit 20 by the spring 18. The other end of the spring 18 is fixed by the plug 14. The through hole of the core 21 through which the spool 16 is inserted is
The spool 16 is formed to have a diameter (in terms of assembly error) that is sufficiently larger than the diameter of the portion of the spool 16 inserted into the through hole. Therefore, even if the cores of the plunger 33 and the spool 16 are slightly deviated from each other, the assembly and characteristics of the solenoid valve 1 are hardly affected.

[Structure of the bobbin part] Next, the bobbin part 23
The structure will be described with reference to FIG. For example, the bobbin portion 23 is made of PPS resin and is first formed in a shape as shown in FIG. The bobbin portion 23 has a substantially cylindrical shape, a bobbin flange portion 23b is formed in each opening, and a portion of the inner peripheral surface (a portion of the inner peripheral surface facing the plunger 33) has an inner diameter. Convex part (bearing part 23
a) has been formed. In the bobbin portion 23, a tubular portion (first tubular portion) of a part of the core 21 is press-fitted from one axial direction, and a tubular portion (a second tubular portion) of the case 27 is pressed from the other axial direction.
The tubular part) is press-fitted. Therefore, the inner wall of the portion into which the tubular portion is press-fit is processed and set to an appropriate diameter (see FIG. 2).
(B)). Next, the bearing portion 23a will be described. 2C and 2D show the bobbin portion 2 in the state of FIG.
It is the figure which looked at 3 from the axial direction. The example shown in FIG. 2C shows a state in which the bearing portion 23a is continuously provided along the inner circumference. In the example shown in FIG. 2D, the bearing portion 23a
It shows a state in which is provided intermittently along the inner circumference. In addition, when the bearing portion 23a is provided intermittently, as shown in FIG.
As shown in FIG. 5, the number of protrusions is not limited to four, and various numbers of protrusions can be provided in various shapes.

[Assembling Method of Solenoid Valve] Next, an outline of an assembling method of each member constituting the solenoid valve 1 will be described with reference to FIG. In FIG. 4, the spring 18, the plug 14, the bush, and the like are omitted for the sake of explanation. Also, the shape of each member is simplified. When assembling the solenoid valve 1 having the above configuration, the case 2 provided with the bush 31 and the cap 28
7, the plunger 33 is inserted, and the solenoid portion 25z
(The bobbin portion 23, the exciting coil 25, the molding member 26,
The member in which the connector part 29 is assembled is inserted. And
The core 21 is inserted into the solenoid portion 25z, and the valve body portion 10 (a member in which the sleeve 12, the spool 16, the spring 18, and the plug 14 are assembled) is brought into contact with the core flange portion 21a of the core 21. Then, the axially open end of the case 27 (open end on the valve body 10 side) is caulked for coupling. In this solenoid valve 1, the magnetic drive unit 20
In order to provide a connector portion 29 for supplying a current to the exciting coil 25, the case 27 has a notch portion 27b extending in the axial direction from one open end of the case 27 (open end on the valve body 10 side). It is provided. Further, the above-mentioned members are arranged coaxially except for the connector portion 29.

In the solenoid valve 1 having the above structure, when the exciting coil 25 is excited, the plunger 33 is attracted to the core 21 side by the force corresponding to the value of the current supplied to the exciting coil 25. Then, as the plunger 33 is driven, the spool 16 is displaced against the biasing force of the spring 18.
As a result, the land provided on the spool 16 (a portion of the spool 16 having a larger diameter than the other, provided so that the outer circumference of the spool 16 and the inner circumference of the sleeve 12 are in contact with each other)
By this, the passage / passage area etc. in the passage formed between each port such as the supply port, the control port and the discharge port (12p in FIG. 1) provided in the sleeve 12 and the land are changed and controlled. Thus, the path and pressure of the hydraulic oil are controlled. As described above, the solenoid valve 1 of the present embodiment is different from the conventional one in that the shaft (the shaft 84 in FIG. 5) is press-fitted into the plunger 33 and the bush (the bush 80 in FIG. 5) is inserted into the core 21. ), And the insertion of the buffer member (buffer member 85 in FIG. 5) between the solenoid portion 25z and the core 21 is reduced. Thereby, the productivity can be improved as compared with the conventional case.

The solenoid valve of the present invention is not limited to the configuration, shape, size, material, arrangement, assembly method, etc. described in the present embodiment, and various modifications can be made without departing from the scope of the present invention.
It can be added and deleted. For example, the bobbin unit 23 is set to P
It may be formed of a material other than PS resin.

[0023]

As described above, the solenoid valve according to any one of claims 1 to 3 can reduce the number of parts and further improve the productivity.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic structure of an embodiment of a solenoid valve of the present invention.

FIG. 2 is a diagram illustrating a structure of a bobbin portion 23.

FIG. 3 is a diagram illustrating a structure of a solenoid unit.

FIG. 4 is a diagram for explaining an outline of an assembling method of each member constituting the solenoid valve 1.

FIG. 5 is a sectional view of a conventional solenoid valve 2.

[Explanation of symbols]

1 Solenoid valve 10 valve body 12 sleeves 12a Sleeve flange part 14 plugs 16 spools 20 Magnetic drive 21 core (core member) 21a Core flange part (first flange part) 23 Bobbin part 23a Bearing part 23b Bobbin flange 25 Excitation coil 26 Mold member 27 cases (case members) 27a Case flange portion (second flange portion) 28 caps 29 Connector 31 bush 32 stopper 33 Plunger 34 shaft

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H106 DA03 DA23 DB02 DB12 DB23                       DB32 DC09 DD04 EE35 GA10                       KK17                 3J552 MA01 NA01 PA65 QA06B                       QA13B QB03 QB08

Claims (3)

[Claims] 1. A solenoid valve in which a magnetic drive section for displacing the position of the spool is provided at one end of a valve body section for accommodating a movable spool in a sleeve, wherein the magnetic drive section is a cylindrical bobbin section. And a solenoid section having an exciting coil provided on the outer circumference of the bobbin section, and a core member having a first tubular section part of which is inserted into the inner circumference of the solenoid section from one axial direction of the solenoid section. At least a case member having a second tubular portion partially inserted from the other axial direction into the inner circumference of the solenoid portion, and a tubular or cylindrical movable member provided substantially coaxially with the solenoid portion. The movable member is axially displaced inside the first tubular portion and the second tubular portion according to the current value of the exciting coil, and a part of the outer peripheral surface of the movable member is an inner peripheral surface of the solenoid part. Which is facing the movable member and facing the movable member. On a part of the inner peripheral surface of the inner part,
An electromagnetic valve, wherein a convex portion that substantially abuts an outer peripheral surface of a part of the movable member in the inner radial direction is provided continuously or intermittently with respect to the inner periphery. 2. The solenoid valve according to claim 1, further comprising a bearing member that substantially abuts a part of the outer peripheral surface of the movable member that does not abut on the outer peripheral surface of the movable member, An electromagnetic valve, wherein bearings are supported at at least two places of the bearing member and the convex portion. 3. The solenoid valve according to claim 1 or 2, wherein the movable member is a plunger, the plunger and the spool are arranged substantially coaxially, and the plunger is disposed in the axial direction on the valve body side of the plunger. The solenoid valve is characterized in that the end face is in contact with an end face of the spool on the magnetic drive side in the axial direction.