JPH08316020A - Terminal mounting structure for bobbin - Google Patents

Abstract

PURPOSE: To eliminate the disconnection of the lead wires of the coil of a solenoid when the terminal connected with the wires is formed of synthetic resin. CONSTITUTION: The horizontal parts 5a, 5b of terminals 5A, 5B are inserted into insertion grooves 2a, 2b formed at the terminal mount 2 of a bobbin. The lower surfaces of the parts 5a, 5b of the terminals 5A, 5B are pressed by protrusions 2i, 2j to the sides (lower sides, shown) 2g, 2h of one sides of the grooves. Protrusions 2e, 2f prevent the dropping of the terminals 5A, 5B. Gaps 2o, 2p exist between the sides of the parts 5a, 5b of the terminals 5A, 5B and the walls of the depths of the grooves 2a, 2b. Gaps also exist between the protrusions 2e, 2f and the terminals 5A, 5B. The terminals 5A, 5B laterally move at the time of forming in Fig. b, thereby alleviating the tensions of lead wires.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a terminal provided on a bobbin for supplying a current to a coil, and in particular, a portion around the terminal provided on the bobbin is molded with a synthetic resin to constitute a connector or the like. In this case, the present invention relates to a terminal mounting structure for preventing disconnection of a lead wire during molding of synthetic resin.

[0002]

2. Description of the Related Art As a terminal mounting structure for preventing disconnection of a lead wire of a coil connected to a terminal provided on a bobbin when an external force or thermal stress is applied to the bobbin.
The terminal mounting structure disclosed in Japanese Patent No. 5 is known.

This terminal mounting structure will be described below with reference to FIGS. The bobbin 1 has a terminal mounting portion 2, which corresponds to the first fixed position and the second fixed position, respectively.
The projection 3 and the second projection 4 are provided.

Since the terminal 5 is provided with an engaging portion 6 for engaging the first and second protrusions, the terminal 5 is inserted into the terminal mounting portion 2 as shown in FIG. The terminal 5 and the terminal mounting portion 2 are fixed at the first fixing position by engaging the engaging portion 6 of the above with the first protrusion 3 of the terminal mounting portion 2.

In this state, the lead wire 7 taken out from the bobbin 1 is connected to the terminal 5 without slack. Thereafter, as shown in FIG. 11, the terminal 5 is further pushed into the terminal mounting portion 2, and the engaging portion 6 of the terminal 5 and the second protrusion 4 of the terminal mounting portion 2 are engaged with each other, whereby the second fixing position is obtained. The terminal 5 is fixed to the terminal mounting portion 2 with.

Thus, the lead wire 7 has a predetermined slack. Reference numeral 8 is a coil wound around the bobbin 1, 9 is a lead wire extraction portion, 10 is a lead wire connection portion to the terminal 5, and 11 is a solenoid.

[0007]

Secondary molding is performed with a synthetic resin so as to surround the solenoid 11, and together with the terminal 5 portion,
The connector may be composed of a secondary molded synthetic resin.

However, in the above-mentioned conventional technique, the terminal 5 is tightly inserted into the terminal mounting portion 2 of the bobbin 1 and fixed without rattling, and the lead wire 7 has a large slack. There has been a problem that the lead wire 7 may be broken due to the flow of resin during the next molding.

Although the mechanism of disconnection of the lead wire 7 due to the flow of resin during the secondary molding is not clarified, the slack of the lead wire causes the lead wire 7 to interfere with the corners of the terminal 5 and the terminal mounting portion 2. It is presumed that the wire will break.

Therefore, an object of the present invention is to provide a bobbin terminal mounting structure for preventing breakage of a lead wire during secondary molding.

[0011]

In order to achieve the above object, the bobbin terminal mounting structure of the present invention has terminals (5A) and (5B) mounted on a bobbin (1) around which a coil (8) is wound. In the solenoid (11) in which the lead wires (7A) and (7B) of the coil (8) are connected to the terminals (5A) and (5B), the terminal mounting portion (2) of the bobbin (1) is connected to the terminal (5
A) Inserting grooves (2a) and (2b) for inserting (5B), openings (2c) and (2d) for inserting terminals (5A) and (5B) into the inserting grooves (2a) and (2b), and the opening. Part (2c) (2
In order to prevent the terminals (5A) and (5B) inserted into the insertion grooves (2a) and (2b) through d) from falling off, the openings (2
c) The first protrusion (2e) formed in the vicinity of (2d)
(2f) and the terminals (5A) (5B) on the side surfaces (2g) (2h) on one side of the insertion grooves (2a) (2b) formed in the direction perpendicular to the insertion direction of the terminals (5A) (5B). The second protrusions (2i) and (2j) to be pressed are provided, and the terminals (5A) and (5B) are provided in the insertion direction between the insertion grooves (2a) and (2b) and the terminals (5A) and (5B). ) Is provided with predetermined gaps (2o) (2p) that can be relatively advanced and retracted.

[0012]

When a force is applied to the lead wire due to secondary molding or the like to generate tension, the terminals (5A) and (5B) are inserted into the insertion grooves (2a) and (2b) of the terminal mounting portion (2), and the gap (2) is formed.
o) It moves within the range of (2p) to relieve the tension and prevent the breakage of the lead wires (7A) and (7B).

[0013]

1 to 7 show an embodiment of the present invention, in which an assembled state of a solenoid 11 is shown in FIGS.

In both figures, 1 is a bobbin and 2 is a bobbin 1.
5A, 5B are terminals, 7A, 7B
Is a lead wire of the coil 8 wound around the bobbin 1, 7A is a lead wire at the beginning of the coil 8, and 7B is a lead wire at the end of the coil 8. 10A and 10B are lead wires 7
It is a connecting portion of terminals A and 7B to terminals 5A and 5B.

The terminal mounting portion 2 is shown in FIGS. 2A and 2B, and the terminals 5A and 5B are shown in FIG. Since the terminals 5A and 5B have the same shape, FIG. 3 shows the shape of one terminal 5A. Figure 2
In (a) and (b), 2a and 2b are insertion grooves for inserting the terminals 5A and 5B, and 2c and 2d are insertion grooves 2a and 2d.
The terminals 5A and 5B are inserted into the insertion grooves 2a and 2b through the openings 2c and 2d, respectively, which are formed through the openings 2c and 2d.

Reference numerals 2e and 2f are first protrusions formed near the openings 2c and 2d, respectively, and the inserted terminals 5A and
It acts as a stopper to prevent 5B from falling off. 2g and 2h are insertion grooves 2 formed in the insertion direction of the terminals 5A and 5B, that is, in the direction perpendicular to the horizontal direction in FIG. 2B, that is, in the vertical direction in FIG. 2B.
The side surfaces 2i and 2j on one side of a and 2b are the second side surfaces 2g and 2h on which the terminals 5A and 5B are pressed, respectively.
Is a protrusion.

In FIGS. 3A and 3B, terminals 5A, 5
B is formed in an L shape as a whole. These terminals 5A and 5B are made of a metal plate having a cross section of width B and thickness C, and 5a (5b) is a horizontal part and 5c (5d) is a horizontal part 5.
The rising portion is integrally formed at each one end of a (5b), and is formed by bending a metal plate.

Reference numeral 5e (5f) is a cutout portion for connecting the lead wire formed on the rising portion 5c (5d), and 5g (5h) is a taper portion formed on the other end of the horizontal portion 5a (5b). The terminal 5A (5B) is sharpened so that the female terminal of the missing connector can be easily fitted.

In FIG. 2B, A is the insertion groove 2
The horizontal width of a and 2b, and the terminal 5 in FIG.
It is set to be larger than the width B of A (5B) by a predetermined value. 2k and 2m in FIG. 2 (a) are the insertion grooves 2
When the horizontal portions 5a and 5b of the terminals 5A and 5B are inserted into the terminals a and 2b, the base portions of the rising portions 5c and 5d of the terminals 5A and 5B are notches.

1A and 1B show a state in which the terminals 5A and 5B are inserted into the insertion grooves 2a and 2b of the terminal insertion portion 2 of the bobbin 1, respectively. The insertion grooves 2a and 2b and the terminals 5A and 5B are shown in FIG.
The reference numerals of parts B are shown in FIG. 2 for the sake of clarity.
A part is omitted as compared with FIGS. 3A and 3B and FIGS.

One of the terminals 5A and 5B is, for example, the bobbin 1 in FIG.
It is applied to the surface 2n on one side of the terminal mounting portion 2 and is moved to the left in the drawing, and is inserted into the insertion groove 2a through the opening 2c. At this time, when the terminal 5A passes through the opening 2c, the synthetic resin forming the terminal mounting portion 2 is elastically deformed and the first protrusion 2e is formed.
Is lifted upward in FIG. 1 (b).

When the terminal 5A fits into the insertion groove 2a after passing under the first protrusion 2e, the first protrusion 2e is restored to the position shown in FIG. 1 (b) and the terminal from the opening 2c. Prevent 5A from falling off. The second protrusion 2i pushes the upper surface of the horizontal portion 5a of the terminal 5A downward, and presses the lower surface of the horizontal portion 5a against the side surface 2g on one side of the insertion groove 2a.

Further, in this way, the terminal 5A is inserted into the insertion groove 2a.
At the time of inserting into the terminal, the base portion of the rising portion 5c of the terminal 5A is inserted into the cutout 2k of the terminal mounting portion 2. By doing this,
It is also reliably prevented that the inserted terminal 5A falls off in the downward direction in FIG. 1 (a).

Similarly, the other terminal 5B is connected to the one shown in FIG.
Although it is inserted into the insertion groove 2b from the opening 2d of the terminal mounting portion 2 in, the detailed description is omitted because it is similar to the case of inserting the terminal 5A into the insertion groove 2a.

The horizontal portions 5a and 5b of the terminals 5A and 5B and the insertion groove 2 thus inserted into the insertion grooves 2a and 2b, respectively.
In FIG. 1 (b), reference numeral 2 is provided between the inner wall surfaces of a and 2b.
As shown by o and 2p, a certain gap or more is provided. Also, similar gaps are provided between the horizontal portions 5a and 5b and the first protrusions 2e and 2f. Then, the sum of the gaps provided on both sides of the horizontal portion 5a of the one terminal 5A is the terminal 5A.
And the terminal mounting portion 2 have a predetermined gap that allows relative movement in the horizontal direction, that is, a predetermined gap that allows the terminal 5A to relatively advance and retreat in the insertion direction or the opposite direction.

The terminals 5A, 5 mounted on the terminal mounting portion 2
Notches 5e and 5f of rising portions 5c and 5d of B (FIG. 3B)
As described with reference to FIGS. 4 and 5, the lead wires 7A and 7B of the coil 8 are connected to each other (see reference numeral 10A and 10B).

In this way, the solenoid 11 is constructed. The bobbin 1 is made of synthetic resin. The solenoid 11 shown in FIGS. 4 and 5 is subjected to secondary molding with synthetic resin as shown by reference numeral 12 in FIGS.
The coil 8 is surrounded and protected to protect the terminals 5A and 5B.
The connector 12A is constituted by the secondary molding part and the secondary molding part.
At this time, even if the pressure of the direction shown by the arrow D in FIG. 6 is applied to the lead wire 7A by the flow of the synthetic resin during the secondary molding and the tension of the lead wire 7A is temporarily increased, the terminal 5A Moves in the horizontal direction inside the insertion groove 2a due to the above-mentioned gap and weakens the tension of the lead wire 7A, so that there is no fear of disconnection.

The same applies to the other lead wire 7B, and even when the solenoid of the embodiment is actually secondarily molded, the rate of occurrence of disconnection accidents of the lead wires 7A and 7B was zero.

[0029]

Since the bobbin terminal mounting structure according to the present invention is constructed as described above, even if the bobbin terminal mounting structure is subjected to the secondary molding in the state of the solenoid, the coil is formed by the flow of the synthetic resin for the secondary molding. There is an advantage that the disconnection of the lead wire can be surely prevented.

[Brief description of drawings]

FIG. 1A is a plan view and FIG. 1B is a front view showing a state in which a terminal is attached to a terminal attachment portion according to an embodiment of the present invention.

2A and 2B show a terminal mounting portion of a bobbin used in an embodiment of the present invention, FIG. 2A is a plan view thereof, and FIG.

FIG. 3 shows a terminal used in an embodiment of the present invention, (a) is a plan view and (b) is a front view.

FIG. 4 is a plan view of a solenoid to which an embodiment of the present invention is applied.

5 is a vertical side view of the solenoid of FIG.

FIG. 6 is a plan view with a part of the secondary molding of the solenoid of FIGS. 4 and 5 taken as a cross section.

FIG. 7 is a vertical cross-sectional side view of the secondary molding of the solenoid of FIGS. 4 and 5;

FIG. 8 is a vertical sectional side view of the related art.

9 is an enlarged view of a terminal mounting portion and a part of the terminal of the prior art of FIG. 8, and is a vertical cross-sectional view showing a state immediately before inserting the terminal into the terminal mounting portion.

FIG. 10 is a vertical cross-sectional view showing a state in which the terminal is slightly inserted into the terminal mounting portion from the state of FIG.

11 is a vertical cross-sectional view showing a state in which a terminal is further inserted from the state of FIG. 10 and the insertion is completely completed.

FIG. 12 is an enlarged view of a part of the terminal in the related art of FIG. 8, (a) is a front view and (b) is a side view.

[Explanation of symbols]

 1 bobbin 2 terminal mounting part 2a, 2b insertion groove 2c, 2d opening 2e, 2f first protrusion 2g, 2h side face 2i, 2j second protrusion 2o, 2p gap 5A, 5B terminal 7A, 7B lead wire 8 coil 10A 10B Connection part 11 Solenoid 12 Secondary molding synthetic resin

Claims (1)

[Claims] 1. A solenoid in which a terminal is attached to a bobbin around which a coil is wound, and a lead wire of the coil is connected to the terminal, the terminal attaching portion of the bobbin has an insertion groove for inserting the terminal and a terminal in the insertion groove. An opening to be inserted, a first protrusion formed near the opening to prevent the terminal inserted into the insertion groove from coming off through the opening, and an insertion formed in a direction perpendicular to the insertion direction of the terminal. A second protrusion that presses the terminal against one side surface of the groove, and a predetermined gap is provided between the insertion groove and the terminal so that the terminal can relatively advance and retreat in the insertion direction. Bobbin terminal mounting structure.