JP2699762B2 - Coil end connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a coil end, and more particularly, to a structure for connecting a coil end and a terminal used in an electric coil device of a solenoid valve, for example.

[0002]

2. Description of the Related Art Conventionally, the structure of a connecting portion between an end of an electric coil and a terminal has been configured as shown in FIG. That is, the electric coil is configured by winding a metal wire covered with an insulating layer around a bobbin or the like, and the winding start or end of the winding of the electric coil 1 has the insulating layer removed by a predetermined length from the terminal, The insulating layer removed portion and a predetermined length portion where the insulating layer exists continuously from the removed portion are wound around the rod-shaped terminal 2.

In FIG. 9, reference numeral 3 denotes an insulating layer removing portion winding portion at a winding portion of the end of the electric coil 1 around the terminal 2;
Reference numeral 4 indicates an insulating layer existing portion winding portion that is continuous with the portion. Then, the solder 5 is applied from the insulating layer removing section winding section 3 to the tip of the terminal 2, thereby forming the electrical connection section 6 to have a connection section structure.

[0004]

Since the conventional coil end connection structure is constructed as described above, when the electric coil end is connected to the terminal 2, not only the predetermined length but also the insulating layer is removed. Must. If the removal of the insulating layer is uncertain or if the removal itself is forgotten, a problem of poor electrical connection occurs. Furthermore,
When the solder 5 is applied from the insulating layer removing section winding section 3 to the tip of the terminal 2, a soldering failure called so-called potato solder or tunnel solder occurs, or the soldering itself is forgotten. As a result, there is a problem that electrical connection failure occurs.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems in the conventional structure of the coil end connection portion, and a reliable coil can be obtained even if there is a mistake in an insulating layer removing operation or a mistake in a soldering operation. An object of the present invention is to provide a coil end connection structure that ensures electrical connection between an end and a terminal.

[0006]

According to the present invention, there is provided a coil end connecting portion structure for connecting an end of an electric coil to a rod-shaped terminal, wherein a first connecting portion in which the end of the electric coil is wound near a tip of the terminal; A second connection in which the end of the electric coil extending from the first connection portion is inserted into a fork-shaped clip groove formed at the tip end of the terminal, and a claw defining the clip groove is crimped and fixed. And a solder portion welded so as to be attached to at least a part of the first connection portion and the second connection portion.

[0007]

According to the coil end connection structure of the present invention, the end of the electric coil is wound several times around the tip of the terminal to form the first connection, and then the end of the electric coil extending from the first connection. Is inserted into a clip groove at the end of the terminal, and a claw section defining the clip groove is pressed. As a result, the end of the electric coil sandwiched between the clip grooves is sandwiched so as to be deformed by the claw portion. Therefore, if there is an insulating layer, the insulating layer is broken to make contact between the terminal and the metal wire. Even if the insulating layer has been removed in advance, a reliable connection is made by mechanical clamping, and a second connection portion is formed. Finally, solder is welded so as to adhere to at least a part of the first connection portion and the second connection portion. As a result, even if there is a mistake in the operation of removing the insulating layer at the end of the electric coil or a mistake in the soldering operation, a reliable electric connection between the electric coil and the terminal is made by pressing the claws.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a coil end connection structure according to the present invention. FIG. 1 shows a coil end connection structure 10 according to one embodiment of the present invention. In the coil end connecting portion structure 10 of this embodiment, an end of an electric coil 14 is wound several times near a tip of a rod-shaped terminal 13 having a clip groove 12 formed by a claw 11 formed in a tip. First connecting part 15
It has.

The first connecting portion 15 is connected to the internal conductor portion 14a.
An insulating layer existing winding portion 15a in which an insulating layer 14b covering the insulating layer 14b is present and an insulating layer removal winding portion 15b that is continuous with the wound portion 15a and has the insulating layer 14b removed at the distal end side and wound as a conductor portion 14a. It is configured. Further, as shown in FIG. 2, the coil end connection structure 10 is configured such that the conductor portion 14 a extending from the insulating layer removed portion 15 b of the first connection portion 15 is wound around the claw portion 11 at the end of the terminal 13, (FIG. 3), and the end of the terminal 13 and the claw 11 are
A compressive force is applied in the direction shown by the arrow in FIG.
Bend to two sides, and as shown in FIG.
2 is provided with a second connecting portion 17 which is press-bonded so as to crush the conductor portion 14a passed through.

[0010] Then, solder is applied from the insulating layer removed winding portion 15b of the first connection portion 15 to the tip of the terminal 13 including the second connection portion 17, whereby the electric connection between the conductor portion 14a and the terminal 13 is made. A solder portion 18 is further configured to further secure the electrical connection and mutual fixation.

The coil end connection structure 10 according to the embodiment described above.
According to the above, the insulating layer 14 on the end side of the electric coil 14
When b is fixed to the terminal 13 as described above without being removed, the claw portion 11 is bent at the second connection portion 17 toward the clip groove 12 so as to crush the electric coil 14 (FIGS. 5 and 5). 6), the insulating layer 14b is destroyed, and the side edge 11a of the claw portion 11 and the end side edge 13a of the terminal 13 directly contact the conductor portion 14a to make electrical connection. Therefore, even if the end of the electric coil 13 is fixed to the terminal 13 without erroneously removing the insulating layer 14b, the electrical connection is reliably ensured.

This is the same even when a solder defect occurs. That is, even if there is a defective solder, the electrical connection is made by the press-fitting of the electric coil 14 in the clip groove 12 as described above, so that there is no immediate problem in the electrical connection due to the defective solder.

Next, a solenoid valve device 20 will be described with reference to FIGS. 7 and 8 as an example of a device constituted by using the coil end connection structure 10 according to the above-described embodiment. 7 and 8, 21 is a case, 22 is a plate, 23 is a plunger, 24 is a fixed iron core, 25 is a valve seat, 2
6 is a spring, 27 is a bobbin around which the electric coil 14 is wound, and 28 is the coil end connection structure 10 of the present invention.
Reference numeral 1 denotes an insulating cover that electrically insulates from 1, 1 denotes a lead wire, 30 denotes an O-ring, 31 denotes an input hole, and 32 denotes a discharge hole.

The case 21 is formed of a magnetic material and serves as a yoke, and the plate 22 is also formed of a magnetic material. The plunger 23 is formed by a movable iron core. Thus, the case 21, the plate 22, the plunger 23 and the fixed core 24 form a magnetic circuit.
When an electric current is passed through the electric coil 14, the electric coil 14 is excited and causes the fixed iron core 24 to attract the plunger 23 against the spring 26.

When the electric coil 14 is deenergized, the fixed core 2
4 releases the plunger 23, and the spring 26 pushes the plunger 23 forward. In this way,
The plunger 23 responds to the energization and deactivation of the electric coil 14.
The input hole 31 is opened and closed by the conical tip portion of. Therefore, when the valve is opened, the control fluid flows through the input hole 31 and flows out of the discharge hole 32, and stops the flow of the control fluid when the valve is closed.

In such an electromagnetic valve device 20, the electric coil 14 wound around the bobbin 27 has a winding start side as shown in FIG.
FIG. 1 shows the state before the terminal 13 is bent as indicated by a dotted line.
As described with reference to FIG.
Is wound to form the first connection portion 15, and the leading end conductor portion 14 a is inserted into the clip groove 12 while being wound around the claw portion 11. Further, similarly, on the winding end side, when the terminal 13 is in a state before being bent, the electric coil 14 is wound to form the first connection portion 15, and the leading end conductor portion 14 a is inserted into the clip groove 12 while being wound around the claw portion 11. . In this state, after the claw portions 11 of the terminals 13 on the winding start side and the winding end side are bent to fix the conductor portion 14a, a part of the first connection portion 15 and the second connection portion 17 are included. The tip of the terminal 3 is covered with solder. Next, the winding start terminal 13 and the winding end terminal 13 are bent in the direction indicated by the arrow 33 in FIG.

In the above-described solenoid valve device 20, the terminal 13 is projected in the radial direction of the bobbin 27. However, the terminal 13 may be projected in the axial direction of the bobbin 27.

[0018]

As described above, according to the coil end connecting portion structure of the present invention, the electric connection between the terminal and the electric coil is added to the first connecting portion, and a clip groove is formed at the end of the terminal. Since the second connection portion capable of obtaining an electrical connection by being compressed through the tip conductor portion of the coil is configured, it is possible to compensate for an electrical connection failure due to a defective solder and a defective removal of the insulating layer of the electrical coil. The reliability of the electrical connection to the terminal can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a coil end connection structure according to an embodiment of the present invention.

FIG. 2 is a plan view showing a process of forming a coil end connection structure shown in FIG. 1;

FIG. 3 is an enlarged cross-sectional view showing a clip groove at a terminal end in a process of forming a coil end connection structure shown in FIG. 2;

FIG. 4 is an enlarged sectional view showing a second connecting portion in the coil end connecting portion structure shown in FIG. 1;

FIG. 5 is an enlarged cross-sectional view showing a state where the electric coil is inserted into a clip groove of a terminal without removing a coating on a distal end side of the electric coil in a process of forming a coil end connection portion structure of the present invention.

FIG. 6 is a cross-sectional view showing a state in which the claw is bent from the state in which the electric coil is inserted into the clip groove shown in FIG. 5 and the electric coil is crimped in the clip groove.

FIG. 7 is a cross-sectional view showing an electromagnetic valve device configured using the coil end connection structure of the present invention.

FIG. 8 is a sectional view of the solenoid valve device shown in FIG.
It is sectional drawing broken and shown along a line.

FIG. 9 is a cross-sectional view showing a conventional coil end connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Coil end connection part 11 Claw part 12 Clip groove 13 Terminal 14 Electric coil 14a Conductor part 14b Insulation layer 15 First connection part 17 Second connection part 18 Solder part

Claims (1)

(57) [Claims] 1. A coil end connecting part structure for connecting an end of an electric coil to a rod-shaped terminal, wherein a first connecting part in which the end of the electric coil is wound near a tip of the terminal, A second connecting portion which clamps an end of the electric coil extending from the first connecting portion into a fork-shaped clip groove and presses and fixes a claw section defining the clip groove; A coil end connection part structure comprising at least a part of the first connection part and a solder part attached to the second connection part.