JPH0953741A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide parts in common and thereby reduce cost. SOLUTION: A coil 19 is disposed in a coil inserting groove 16 of a stator 14 to be connected to a coil terminal 21 through a lead wire 20. The coil terminal 21 projects above the upper surface of the stator 14. A terminal assembly 25 to input an electric signal from the exterior is disposed above the stator 14. The terminal assembly 25 has a pair of left and right signal inputting plugs 28 provided on the lower end with connecting terminals 28b respectively. The connecting terminal 28a and coil terminal 21 are electrically interconnected through a sub-harness 29. The subharness 29 is composed of claw parts provided on both ends of a flexible lead wire and lead wire. The claw parts clamp the connecting terminal 28a and coil terminal 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve and a stator used for the solenoid valve.

[0002]

2. Description of the Related Art This type of solenoid valve is generally used as a flow rate control valve for a fluid (operating oil or fuel), and opens or closes a fluid passage in accordance with a valve body opening or closing operation.
Adjust the fluid flow rate. Specifically, the solenoid valve has a stator around which a coil is wound, and a signal input member (terminal assembly) for inputting an electric signal from the outside is electrically connected to a coil terminal directly connected to the coil. To be done. When the coil is excited by the electric signal input from the signal input member, the movable part (armature) connected to the valve element is attracted to the stator, and the valve element moves to the valve opening position or the valve closing position. To do.

[0003]

Further, in recent years, various specifications have been demanded for solenoid valves, while demands for cost reduction are high. However, in the existing technology, if the solenoid valve is configured according to each specification, the number of types of components increases, and it becomes difficult to reduce the cost. That is, when the specifications of the solenoid valve are different, the attraction force of the stator when the coil is excited differs. In this case, since the coil diameter changes, the position of the coil terminal directly connected to the coil also changes. Therefore, the signal input member must be selected according to the position of the coil terminal, which causes the above-mentioned inconvenience.

The present invention solves the above problems, and an object thereof is to provide a solenoid valve in which parts can be shared and the cost can be reduced.

[0005]

In order to achieve the above object, the invention according to claim 1 provides a predetermined signal input member for inputting an electric signal from the outside to a stator having a coil wound around it. In a solenoid valve arranged in a positional relationship, the coil is excited by an electric signal input to the signal input member, and the movable portion connected to the valve body is attracted to the stator due to the excitation of the coil, The gist is that the coil terminal directly connected to the coil is projected from the end face of the stator toward the signal input member side, and the connecting terminal provided on the signal input member is connected to the coil terminal via an auxiliary wire.

That is, according to the above configuration, the electric signal from the outside is transmitted to the coil via the connecting terminal of the signal input member and the auxiliary wire. At this time, the coil is excited, and the movable part connected to the valve body is attracted to the stator as the coil is excited. That is, for example, in the case of a normally closed valve, the valve element moves from the valve closed position to the valve open position with the excitation of the coil, and the fluid flows in the fluid passage.

Further, in the above construction, since the coil terminal is projected from the end face of the stator toward the signal input member side and the coil terminal and the input terminal of the signal input member are connected by using the auxiliary wire, the connection between both terminals is easy. Becomes In particular, even if the stator (coil) is changed due to a specification change and the position of the coil terminal with respect to the connection terminal of the signal input member is changed, the auxiliary wire can be used to easily connect the two terminals. Also, when such specifications are changed (when the stator is changed)
Also, a common signal input member can be used, and cost reduction can be realized.

According to a second aspect of the present invention, in the first aspect of the present invention, the auxiliary wire is capable of electrically connecting between a claw portion that holds the coil terminal and the connection terminal and both claw portions. The gist is that it consists of a flexible lead wire. By using the auxiliary wire having the above structure, the auxiliary wire can be easily connected to each terminal, and the electric wiring between the terminals can be facilitated.

According to a third aspect of the present invention, in a stator in which a plurality of curved plate members of magnetic material are spirally laminated, a compressive stress is applied in advance to the inner surface of the curved plate members. The main point is to be there. That is,
In the stator having the above structure, the plate material is apt to be deformed by the springback force (the force of returning from the spiral shape to the flat plate shape), which causes a defect such as the deformation of the stator. The above-mentioned problems are caused by a force generated when the plate materials are stacked in a spiral shape, a slight vibration when the solenoid valve is used, or the like. On the other hand, according to the above configuration, by applying the compressive stress to the inner surface of the plate material, the deformation due to the springback force can be suppressed, and the problem is eliminated. Further, with the above configuration, the performance deterioration of the stator can be suppressed.

According to a fourth aspect of the invention, in the third aspect of the invention, the inner surface of the curved plate material is shot peened to retain a compressive force. There is. With such a configuration, problems such as the deformation of the stator due to the compressive residual stress due to the shot peening are eliminated.

According to a fifth aspect of the present invention, in the third aspect of the invention, a cutout groove extending in a direction orthogonal to the bending direction is formed on the inner side surface of the plate member having the curved shape. It is a summary. With such a configuration, problems such as the collapse of the shape of the stator due to the stress concentration in the cutout groove are eliminated.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the solenoid valve of the present invention will be described below with reference to the drawings. The solenoid valve of the present embodiment functions as a normally closed valve (normally closed valve), and when the coil is demagnetized normally,
The valve body is held at a position where the fluid passage is closed, and when the coil is excited, the valve body moves and the fluid passage is opened.

FIG. 1 is a sectional view showing a schematic structure of the solenoid valve 1. That is, the solenoid valve 1 is mounted in the solenoid valve mounting recess 3 formed in the pump housing 2 of the hydraulic pump, and the flow rate of the fluid (working oil) flowing in the fluid passage 4 formed in the pump housing 2 is the same. Adjust. In the solenoid valve 1, a signal input section for inputting an electric signal from the outside and a valve section for opening and closing the fluid passage 4 in response to the input of the electric signal are surrounded by a valve housing 5.

The valve housing 5 has a substantially cylindrical shape,
A male screw portion 5a is formed on the outer peripheral surface. on the other hand,
The pump housing 2 is formed with a female thread 2a. The male thread 5a of the valve housing 5 is screwed into the female thread 2a, so that the valve housing 5 is fixed to the pump housing 2. An O-ring 6 is provided between the inner wall of the pump housing 2 (the inner wall of the solenoid valve mounting recess 3) and the outer wall of the valve housing 5, and the O-ring 6 allows the gap between the two housings 2 and 5 to flow. It is tightly sealed.

A valve casing 7 is assembled at the lowermost portion of the valve housing 5 in the figure, and the lower portion of the valve casing 7 is fitted in the deepest portion of the solenoid valve mounting recess 3 formed in the pump housing 2. Has been inserted.
A needle valve 8 as a valve body is slidably arranged in the valve casing 7, and a seat surface 8a is formed at the tip (lower end in the figure) of the needle valve 8. A disc-shaped armature 9 as a movable part is connected to the upper end of the needle valve 8. The valve casing 7 is formed with communication passages 10 a and 10 b which communicate with the fluid passage 4. An annular fluid chamber 11 is formed in the inner part of the communication passage 10a, and a tapered valve seat 12 that abuts against the seat surface 8a of the needle valve 8 is formed below the annular fluid chamber 11.

A stator 14 is arranged above the valve casing 7 via a spacer 13. The stator 14 has a laminated structure composed of a large number of magnetic materials. A bottom view of the stator 14 is shown in FIG. 2, a sectional view taken along line III-III of FIG. 2 is shown in FIG. , Respectively.

That is, the stator 14 is constructed by spirally stacking the plate 15 shown in FIG. The plate 15 is entirely formed in a curved shape, and a recess 15a is formed in a part thereof. A silicon steel plate having a uniform thickness is used as the magnetic plate 15, and the plate 15 having the shape shown in FIG. 4 is formed by press punching of the silicon steel plate. Here, after press punching of the plate 15, shot peening is performed on the inner surface of the curved shape to give a predetermined compressive residual stress (for example, 600 N / mm ² ). That is, a minute steel ball is blown onto the plate 15 from the direction A in FIG. 4, and a compressive residual stress is applied to the blow surface (the inner side surface of the plate 15).

Then, the plate 15 is fixed to the stator 1 with a jig or the like.
4 is arranged in a spiral shape with respect to the central axis of 4 and the outer periphery thereof is circularly welded by a laser or the like, so that the concave portion 1 of the plate 15
An annular coil insertion groove 16 corresponding to 5a is formed, and a through hole 17 is formed at the central position of the stator 14 (see FIGS. 2 and 3). Further, in the coil insertion groove 16,
The through hole 18 is formed at a position symmetrical with 180 °.

Further, in FIG. 1, a coil 19 is provided in the coil insertion groove 16, and a coil terminal 21 is connected to the coil 19 via a lead wire 20.
The coil terminal 21 passes through the through hole 18 of the stator 14 and projects above the upper surface of the stator. A substantially cylindrical pin 22 is press-fitted and fixed in the through hole 17 of the stator 14, and the needle valve 8 is provided between the step 22 a of the pin 22 and the top of the armature 9 in a downward direction in the figure. Is provided.

In this case, in the demagnetized state of the coil 19,
The needle valve 8 is held at the valve closed position (the illustrated position) by the biasing force of the compression coil spring 23. When the coil 19 is excited, the armature 9 is attracted to the stator 14 and the needle valve 8 moves to the valve opening position. That is,
The fluid flows between the seat portion 8a of the needle valve 8 and the valve seat 12, and the fluid flows through the communication passages 10a and 10b and the fluid passage 4.

A plate 24 having a hole 24a for allowing the coil terminal 21 to penetrate is placed on the upper surface of the stator 14. Above the plate 24, a terminal assembly 25 as a signal input member for inputting an electric signal from the outside is arranged. An insert pin 26 is press-fitted into the terminal assembly 25 and the pin 22 arranged in the center of the stator 14, and the insert pin 26 positions both members 14, 25. Further, between the terminal assembly 25 and the valve housing 5 surrounding the terminal assembly 25, an O-ring 27 for liquid-tightly sealing both members is provided.
Are arranged.

The terminal assembly 25 has a pair of left and right signal input plugs 28, a connecting screw portion 28a is formed at the upper end thereof, and a connecting terminal 28b is formed at the lower end thereof.
Are formed. The connection terminal 28a and the coil terminal 21 are electrically connected via a sub-harness 29 as an auxiliary wire. An O-ring 30 is arranged around the connection terminal 28a, and a plate 31 is arranged below the O-ring 30. A resin material 32 for fixing the sub-harness 29 is filled between the plates 24 and 31.

FIG. 5 shows the structure of the sub-harness 29.
In FIG. 5, the sub-harness 29 is composed of a flexible lead wire 29a and claw portions 29b and 29c that hold both ends thereof. The claws 29b and 29c are joined to the coil terminal 21 and the connection terminal 28a by fusing (soldering is also possible).

In this case, an external terminal (not shown) is connected to the connecting screw portion 28a of the signal input plug 28. The electric signal input from the external terminal is connected to the connection terminal 2
It is transmitted to the coil 19 through 8a, the sub harness 29, and the coil terminal 21, and the coil 19 is excited.

According to the configuration of the above embodiment, the use of the sub-harness 29 facilitates the connection between the coil terminal 21 and the connection terminal 28a. In particular, the connection terminal 28a
The position of the coil terminal 21 with respect to can be set arbitrarily, and the common terminal assembly 25 can be realized. That is, in FIG. 6, when the left and right spacings of the connection terminals 28a are "W1" and the left and right spacings of the coil terminals 21 are "W2", both the spacings W1 and W2 are not the same (in the present embodiment, W1 <W2) By using the sub-harness 29, appropriate and easy electric wiring can be performed regardless of the distances W1 and W2. As a result, for example, the common terminal assembly 25 can be used even when the specifications are changed (when the stator 14 is changed), and the cost can be reduced.

FIG. 7 shows the diameter of the stator 14 (coil diameter).
It is a top view which shows the arrangement | positioning state of the sub harness 29 when changing. In FIG. 7 (a) where the coil diameter is large,
A straight line L2 connecting the two coil terminals 21 is orthogonal to a straight line L1 connecting the two connection terminals 28a of the terminal assembly 25. Also, as shown in FIG.
In (b), the straight lines L1 and L2 substantially coincide with each other.
That is, in any of the above cases, by using the sub-harness 29 and changing the arrangement state of each member 14 and 25 according to each form, the terminal assembly 2
You can see that 5 can be shared.

On the other hand, in this embodiment, shot peening is applied to the inner surface of the curved plate 15 so that the compressive force remains on the surface. Therefore, problems such as deformation of the plate 15 due to the springback force can be eliminated. That is, since the stator 15 is configured by stacking a large number of plates 15 in a spiral shape, a force (springback force) generated when the plates 15 are assembled and a slight vibration (fluid pressure or thermal stress) when the solenoid valve 1 is used. Although the shape is likely to be deformed due to (vibration due to), the shape collapse can be suppressed by applying compressive residual stress to the inner surface of the plate 15. Further, with the above configuration, the performance deterioration of the stator 14 can be suppressed.

The present invention can be embodied in the following modes other than the above embodiment. (1) In the above embodiment, the plate 1 that constitutes the stator 14
Although shot peening was performed on one surface of the plate 15 in order to allow the compressive stress to remain in No. 5, the compressive stress may be applied by another method. For example, as shown in FIG.
A plurality of cutout grooves 34 extending in a direction orthogonal to the bending direction of the plate 15 are provided on the inner side surface of the plate 5. In such a case, stress concentration occurs on the inner surface of the plate 15 due to the notch groove 34, and it is possible to provide a strong stator 14 that does not lose its shape. The interval between the cutout grooves 34 is set according to the radius of curvature R of the plate 15. That is, in FIG. 8, the radii of curvature R1, R2, R3 of each curved surface of the plate 15 (R after stacking and fixing) are represented by R1.
If <R2 <R3, the notch groove 34 is formed at a position where the radii of curvature R1, R2, R3 change. At this time,
The cutout grooves 34 are formed at smaller intervals on a curved surface having a smaller radius of curvature R. The depth of the cutout groove 34 may be increased as the radius of curvature R becomes smaller.

(2) In the above embodiment, the solenoid valve 1 is constructed by using the stator 14 whose both end surfaces are flat, but the stator may be modified in shape. For example, as shown in FIG. 9, a stator 35 whose one end face has a conical shape may be used. In this case, the conical surface 35a of the stator 35
By disposing a convex armature (not shown), the gap between the stator 35 and the armature can be reduced, and a solenoid valve less affected by the air gap can be constructed.

[0030]

According to the invention described in claims 1 and 2, the excellent effect that the parts can be shared and the cost can be reduced can be achieved.

According to the invention described in claims 3 to 5, by applying the compressive residual stress to the inner surface of the plate material, the deformation due to the springback force can be suppressed, and the problem can be solved. .

[Brief description of drawings]

FIG. 1 is a sectional view showing the overall configuration of a solenoid valve according to the present embodiment.

FIG. 2 is a bottom view of the stator.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a perspective view showing the shape of a plate.

FIG. 5 is a perspective view showing a configuration of a sub-harness.

FIG. 6 is an exploded cross-sectional view of a peripheral portion of a stator and a terminal assembly.

FIG. 7 is a plan view showing an arrangement state of sub-harnesses when a coil diameter is changed.

FIG. 8 is a diagram showing a cross-sectional shape of a plate according to another embodiment.

FIG. 9 is a sectional view of a stator according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic valve, 8 ... Needle valve as a valve body, 9 ... Armature as a movable part, 14 ... Stator, 15 ... Plate, 1
9 ... Coil, 21 ... Coil terminal, 25 ... Terminal assembly as signal input member, 28a ... Connection terminal,
29 ... Sub-harness as auxiliary wire, 29a ... Lead wire, 29b, 29c ... Claw part, 34 ... Notch groove.

Claims (5)

[Claims] 1. A signal input member for inputting an electric signal from the outside is arranged in a predetermined positional relationship with respect to a stator around which a coil is wound, and the coil is excited by the electric signal input to the signal input member. With the solenoid valve adapted to attract the movable part connected to the valve body to the stator along with the excitation of the coil, the coil terminal directly connected to the coil is projected from the end face of the stator to the signal input member side, An electromagnetic valve, wherein a connection terminal provided on the signal input member is connected to the coil terminal via an auxiliary wire. 2. The solenoid valve according to claim 1, wherein the auxiliary wire member includes a claw portion that holds the coil terminal and the connection terminal, and a flexible lead wire that conducts between the both claw portions. . 3. A stator in which a plurality of curved plate members made of magnetic material are spirally stacked, wherein a compressive stress is applied in advance to the inner side surface of the curved plate members. Valve stator. 4. The stator for a solenoid valve according to claim 3, wherein the inner surface of the curved plate member is shot peened to leave a compressive stress. 5. The stator for a solenoid valve according to claim 3, wherein a cutout groove extending in a direction orthogonal to the bending direction is formed on the inner surface of the curved plate member.