JPH0729557Y2 - Coil terminal mounting structure for electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electromagnetic relay, and more particularly, to an improvement in a coil terminal mounting structure for leading a coil lead wire to the outside.

[Prior Art] A general electromagnetic relay is configured, for example, as shown in Fig. 4 (a). That is, the coil 2 is wound around the coil bobbin 1, and the coil terminals 3 and 4 for supplying an exciting current to the coil 2 from the outside are provided. As shown in FIG. 4B, each coil terminal 3 and 4 has an elongated plate shape, and a winding portion 5 around which the conductor wire of the coil 2 is wound is formed at the upper end. Further, the lower portion 7 is formed thin.

Then, as shown in FIG. 5 (a), when the electromagnetic relay is assembled, the coil terminals 3 and 4 penetrate through the through holes 8 formed in the coil bobbin 1 and the contact structure block 6 from above to below. The lower part 7 is exposed below the electromagnetic relay. Then, each winding part 5 is inserted in the through hole 8.
A conductor wire is wound around the conductor wire and fixed by solder or the like.

[Problems to be Solved by the Invention] However, the electromagnetic relay configured as described above still has the following problems to be solved. That is, since the coil terminals 3 and 4 are generally formed by pressing a conductive plate material having elasticity, it is difficult to obtain a high degree of dimensional accuracy. Therefore, the fifth
As shown in FIG. (A), when the long coil terminals 3 and 4 are inserted into the through holes 8, there is a minute gap between the side surfaces of the coil terminals 3 and 4 and the inner surface of the through hole 8. Occurs. As a result, as shown in FIG. 4 (a), the coil terminals 3 and 4 are not stable when incorporated in an electromagnetic relay, and the dimensional accuracy of the distance between the lower portions 7 is reduced. In addition, the vertical mounting position accuracy is also reduced.

If the coil terminals 3 and 4 easily move in the vertical direction,
There is a concern that the conductor wire 2a of the coil 2 wound around the winding portion 5 formed at the upper end and fixed by solder or the like may be cut as shown in the drawing. Therefore, it is necessary to suppress the vertical movement of the coil terminals 3 and 4 after mounting the coil terminals 3 and 4.

As a measure for improving this dimensional accuracy, as shown in FIG. 5 (b), a wedge-shaped protrusion 9 is formed at a middle position of the coil terminals 3 and 4 in the longitudinal direction, and the wedge-shaped protrusion 9 is formed. With the projecting portion 9 formed, these coil terminals 3 and 4 are inserted into the through hole 8
It is possible to press it in. In this case, coil terminals
The protrusions 9 and 9 are formed in the process of being inserted into the through hole 8 from above.
The inner wall of the through hole 8 is scraped off at the tip of.

Therefore, since the coil terminals 3 and 4 are always in pressure contact with one inner wall in the through hole 8, the coil terminals 3 and 4 are in the horizontal direction (lateral direction).
The mounting position accuracy of is improved.

However, once the coil terminals 3 and 4 are inserted into the through hole 8 from above, the presence of the wedge-shaped protrusion 9 prevents the coil terminals 3 and 4 from moving upward, but the coil terminals 3 and 4 can be easily moved downward. Moving. Therefore, even if the vertical position of the coil terminals 3 and 4 is correctly set at the beginning, if vibration is applied or the tip of the coil terminals 3 and 4 is touched with the hand, the coil terminals 3 and 4 will easily move downward. There was concern.

Of course, if the height ΔH of the wedge-shaped protrusion 9 shown in FIG. 5 (b) is increased, the mounting position accuracy of the horizontal position and the vertical position is increased, but the height of the wedge-shaped protrusion 9 is increased. If the height ΔH is increased, a great amount of force is required to press-fit the coil terminals 3 and 4 into the through hole 8, and the work efficiency of assembling the electromagnetic relay shown in FIG. 4 (a) is significantly reduced. .
Further, since it is necessary to apply a large force to the upper ends of the coil terminals 3 and 4, there is a concern that the coil terminals 3 and 4 may be deformed.

Further, if the height ΔH of the wedge-shaped protrusion 9 is increased,
The amount of cutting at the tip of the protruding portion 9 becomes large, and there is a concern that the inner surface of the through hole 8 will be greatly damaged.

The present invention has been made in view of such circumstances,
By forming a wedge-shaped protrusion in the middle of the coil terminal and forming a protrusion on the upper end that is locked by a locking block located above the through hole, the horizontal and vertical positions are improved. It is an object of the present invention to provide a coil terminal mounting structure for an electromagnetic relay, which can greatly improve the mounting accuracy of the electromagnetic relay, can be inserted into the through hole with a small pressure, and can significantly improve the assembly work efficiency of the electromagnetic relay.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, a terminal holding block having a through hole is formed outside one side plate of a coil bobbin around which a coil is wound. In an electromagnetic relay in which a long coil terminal for guiding the coil lead wire to the outside is fixed by penetrating, a protrusion protruding from the upper end of the coil terminal in a direction orthogonal to the axis and a protrusion With the coil terminal inserted into the through hole until the lower end abuts on the upper edge of the through hole, the engaging block protruding from the side plate so that the lower surface abuts on the upper end of the protrusion, and the engaging block of this engaging block. A slanting slanting surface formed on the upper surface, in which the lower end of the protrusion slides in the process of inserting the coil terminal into the through hole, and formed at an intermediate position in the axial direction of the coil terminal,
A wedge-shaped protrusion is press-fitted along the inner surface of the through hole in the process of inserting the coil terminal into the through hole.

[Operation] In the coil relay terminal mounting structure of the electromagnetic relay configured as described above, when the coil terminal is inserted to the specified position in the through hole, the horizontal position is a wedge-shaped protrusion formed in the middle position. The upper and lower ends of the protrusion formed on the upper end of the coil terminal are in contact with the lower surface of the locking block, and the lower end of the protrusion is in contact with the upper edge of the through hole.

Further, in the process of inserting the coil terminal into the through hole, the lower end of the projection portion slides on the slanting slanting surface formed on the upper surface of the locking block. In addition, since the vertical position is restricted by the locking block, it is possible to reduce the height of the wedge-shaped protrusion formed at the midway position.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a coil terminal incorporated in the electromagnetic relay of the embodiment. FIG. 1 (a) is a perspective view, and FIG. 1 (b) is a diagram of FIG. 1 (a) taken along line XX ′. It is a cross-sectional view, and the same figure (c) is a side view.

That is, the coil terminal 11 is formed by pressing an elastic conductive plate material having a long width W and has a rectangular shape having a width L in the direction orthogonal to the axis near the upper end 11a. The protrusion 12 is formed. An inclined portion 12a as shown in the drawing is formed at the lower end of the protrusion 12. Furthermore, a coil wire is wound on the upper position of the protrusion 12,
A winding portion 12c is formed for fixing with solder or the like. In addition, a wedge-shaped protrusion 13 protruding in the same direction as the protrusion 12 is formed in the middle of the coil terminal 11. The height Δh of the wedge-shaped protrusion 13 is set lower than the conventional height ΔH shown in FIG. 5 (b).

In addition, in the middle portion including the wedge-shaped protruding portion 13, a collation 14 is formed in the longitudinal direction. As shown in FIG. 2B, this collation 14 is pressed so as to project to the one surface 15a side of the coil terminal 11 and to be recessed on the other surface 15b.

FIG. 2 is a perspective view showing the bobbin 16 around which the coil is wound. This bobbin 16 is a cylindrical body around which a coil (not shown) is wound.
It is composed of 17 and side plates 18 and 19 attached to both sides of the cylindrical body 17. A pair of terminal holding blocks 20a, 20b are integrally formed on the outer side of one side plate 18. Then, each terminal holding block 20a, 20b is provided with through holes 21a, 21b penetrating from the upper side to the lower side. The length in the longitudinal direction of the horizontal cross section of the through holes 21a, 21b is the width (W + Δh) obtained by adding the width ΔW of the coil terminal 11 to the height Δh of the wedge-shaped protrusion 13.
The length of each through hole 21a, 21b in the short-side direction in the horizontal direction is set to be slightly shorter than the value obtained by adding the thickness of the coil terminal 11 to the thickness of the correlation 14.

Further, locking blocks 22a and 22b are also integrally formed on the outer surface of the side plate 18 above the through holes 21a and 21b, respectively.

The lower surface of each locking block 22a, 22b is formed in parallel with the upper surface of each terminal holding block 20a, 20b, and the upper surface of each locking block 22a, 22b has a slanting slope 23 inclined in the direction of the drawing.
a and 23b are formed. Then, each locking block 22a, 2
The distance between the lower surface of 2b and the upper surface of each terminal holding block 20a, 20b is set to the same value as the width L of the protrusion 12 of the coil terminal 11.

Next, in the coil terminal mounting structure of the electromagnetic relay configured as described above, the coil terminal 11 is arranged so that the projection 12 faces the locking block 22a side, and the lower end 11b extends through the through hole 21a.
Insert into. The coil terminal 11 is initially smoothly inserted into the through hole 21a. Then, when the wedge-shaped protrusion 13 is inserted into the through hole 21a, pressure is applied and the wedge-shaped protrusion 13 is inserted further downward. Then, the wedge-shaped projecting portion 13 becomes the through hole 21a.
Move downward while cutting the inner wall.

When the coil terminal 11 is further pressed into the through hole 21a, the lower end of the protrusion 12 of the coil terminal 11 is locked by the locking block 22a.
Abutting against the sliding inclined surface 23a. Further, when the coil terminal 11 is press-fitted downward, the coil terminal 11 moves further downward while the lower end of the protrusion 12 slides along the sliding inclined surface 23a. Therefore, the coil terminal 11 as a whole has a slanting inclined surface 23.
Bend to the opposite side of a and move downward.

In addition, since the inclined portion 12a is formed at the lower end of the protruding portion 12, the sliding operation between the slanting slanting surface 23a and the lower end is smoothly performed, and the pressure applied to the coil terminal 11 can be reduced.

The lower end of the protrusion 12 of the coil terminal 11 is the terminal holding block 20a.
When it comes into contact with the upper surface of the coil terminal 11, the coil terminal 11 does not move further downward. In addition, the lower end of the protrusion 12 is the terminal holding block 20.
Simultaneously with the contact with the upper surface of a, the upper end of the coil terminal 11 moves below the lower surface of the locking block 22a, so that the bending of the coil terminal 11 is restored by the elastic restoring force, and the upper end of the protrusion 12 is locked. Entering below the block 22a, the upper end of the protrusion 12 and the lower surface of the locking block 22a come into contact with each other.

Since the distance between the upper surface of the terminal holding block 20a and the lower surface of the locking block 22a is set equal to the width L of the protruding portion 12 of the coil terminal 11 as described above, the protruding portion 12 has the third position. As shown in FIG. 7A, the terminal holding block 20a is sandwiched between the upper surface and the lower surface of the holding block 22a.

FIG. 3 (a) is a vertical sectional view showing a state in which the coil terminal 11 is inserted to the regular position in the through hole 21a of the terminal holding block 20a by the above-described procedure, and FIG. 3 (b) is a horizontal sectional view. . . As shown in the drawing, when the coil terminal 11 is inserted to the regular position, the wedge-shaped protrusion 13 is present, so that the coil terminal 11 in the through hole 21a is pressed against the inner wall in the direction A in the figure. Further, since the correlation 14 is formed in the middle of the coil terminal 11, the coil terminal 11 has a through hole 21a.
It is pressed against the inner wall in the direction B in the figure.

Therefore, the movement of the coil terminal 11 in the horizontal direction is restricted within the through hole 21a, and the coil terminal 11 is constantly pressed against the same inner wall, so that the accuracy of the horizontal mounting position is improved.

Further, since the downward movement of the coil terminal 11 shown by C in the figure is restricted by the upper surface of the terminal holding block 20a and the lower surface of the locking block 22a as described above, the vertical mounting position accuracy is also improved. To do.

Further, since the vertical movement is restricted by the terminal holding block 20a and the locking block 22a, the wedge-shaped projection 13 formed at the middle position of the coil terminal 11 can move only the horizontal movement of the coil terminal 11. It suffices to regulate it, and it is not necessary to regulate not only the horizontal movement but also the vertical movement unlike the wedge-shaped projection 9 of the conventional coil terminals 3 and 4 shown in FIG. As a result, the height Δh of the protrusion 13 can be made significantly lower than the height ΔH of the conventional protrusion 9.

Therefore, when the coil terminal 11 is inserted into the through hole 21a, the pressure applied to the coil terminal 11 can be significantly reduced. As a result, the assembly work efficiency of the electromagnetic relay can be significantly improved.
The lower end of the protrusion 12 is the slanting surface 2 of the locking block 22a.
Although the coil terminal 11 bends when the 3a is slid, the bending force is almost negligible in comparison with the force when the wedge-shaped protrusion 13 cuts the inner wall of the through hole 21a.

Further, when the height Δh of the wedge-shaped protrusion 13 is reduced, the amount of removing the inner wall in the through hole 21a is reduced, the probability of damaging the terminal holding block 20a is reduced, and the reliability of the entire electromagnetic relay is reduced. Can be improved.

[Effects of the Invention] As described above, according to the coil terminal mounting structure of the electromagnetic relay of the present invention, the wedge-shaped protrusion is provided at the middle position of the coil terminal, and the upper end is provided outside the through hole. By forming the projections that are locked to the locking blocks, the horizontal position accuracy can be maintained by the function of the wedge-shaped projections, and the vertical position accuracy can be maintained by the function of the upper projections. . Therefore, the mounting accuracy of the coil terminal can be significantly improved, and the height of the protrusion can be reduced to insert the coil terminal into the through hole with less pressure.
The assembly work efficiency of the electromagnetic relay can be greatly improved.

[Brief description of drawings]

1 to 3 show a coil terminal mounting structure of an electromagnetic relay of the present invention. FIG. 1 (a) is a perspective view of the coil terminal, and FIG. 1 (b) is a horizontal sectional view of the coil terminal. FIG. 4 (c) is a side view of the coil terminal, FIG. 2 is a perspective view showing a coil bobbin, and FIGS. 3 (a) and 3 (b) are cross-sectional views for explaining the effect, and FIG. ) Is a perspective view showing a general electromagnetic relay, FIG. 5 (b) is a perspective view showing a conventional coil terminal, and FIGS. 5 (a) and 5 (b) explain problems of the conventional coil terminal mounting structure. FIG. 11 …… Coil terminal, 12 …… Projection, 13 …… Wedge-shaped projection, 14 …… Corrugation, 16 …… Coil bobbin,
18,19 …… Side plate, 20a, 20b …… Terminal holding block, 21a, 21
b …… Through hole, 22a, 22b …… Locking block, 23a, 23b ……
A slanting surface.

Claims (1)

[Scope of utility model registration request] 1. A terminal holding block having a through hole formed outside one side plate of a coil bobbin around which a coil is wound, and a long wire for leading the lead wire of the coil to the outside through the through hole. In an electromagnetic relay in which a coil terminal is fixed by penetrating, a projecting portion protruding from the upper end portion of the coil terminal in a direction orthogonal to the axis, and a lower end of the projecting portion abuts on an upper edge of the through hole. The coil terminal is inserted into the through hole, a locking block protruding from the side plate so that the lower surface abuts on the upper end of the protrusion, and a locking block formed on the upper surface of the locking block. A slanting slant surface on which the lower end of the projecting portion slides in the process of inserting the coil terminal into the through hole;
A coil of an electromagnetic relay that is formed at an intermediate position in the axial direction of the coil terminal, and has a wedge-shaped protrusion that is press-fitted along the inner surface of the through hole in the process of inserting the coil terminal into the through hole. Terminal mounting structure.