JPH0340074Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic actuator that can be used, for example, in an electromagnetic valve for controlling the opening and closing of a fuel passage in a fuel injection device, or a similar control device.

[Conventional technology]

For example, as disclosed in Japanese Patent Application Laid-open No. 53-120017, a stator including a plurality of coils is arranged with a flat armature facing the stator, and the flat armature is attracted by energizing the coils. Electromagnetic actuators are known.

One of the conventional electromagnetic actuators of this type
An example will be explained with reference to FIGS. 8 to 10. Reference numeral 1 indicates a stator, and an assembly of a magnetic core 2 and first, second, third, and fourth coils 3, 4, 5, and 6. Consists of. This stator 1 has coils 3 to 6 as core 2.
The coils 3 to 6 are fixed to four annular grooves 7, 8, 9, and 10 with injected resin 11. The stator 1 has a terminal block 12 made of synthetic resin that supports the lead wires 3a, 4a, 5a, and 6a of the coils 3-6.

Reference numeral 13 denotes a magnetic plate, which is placed opposite to the lower surface of the stator 1 so as to function as an armature. 14 is an output shaft, which is fixed to the center of the magnetic plate 13. The output shaft 14 and the magnetic plate 13 are subjected to a downward biasing force in FIG. 8 by a spring (not shown). Therefore, the stator 1 attracts the magnetic plate 13 against this biasing force.

Figures 9 and 10 show core 2 and coils 3 to 6.
This shows the connection method in detail. 1st to 4th
The annular grooves 7, 8, 9, and 10 are provided concentrically on the lower surface of the core 1. The first to fourth coils 3 to 6, only one turn of which is illustrated by a chain line, are interconnected so that current flows in the direction indicated by the arrow. Through holes 15, 16, 17, and 18 are provided in the annular grooves 7 to 10 to perform this interconnection and to lead out the pair of lead wires to the outside.

The terminal block 12 has a through hole 15 as shown in FIG.
Lead insertion holes 19, 20, 2 corresponding to ~18
1,22. The lead wires 3a to 6a at one end of each coil 3 to 6 are connected to the through holes 15 to 18 of the core 2.
and leads out above the terminal block 12 through lead insertion holes 19 to 22 of the terminal block 12. A pair of external lead wires (not shown) are connected to the first lead wire 3a and the fourth lead wire 6a, and the second lead wire 4a and the third lead wire 5a are connected to each other. Connected.

To explain the connection relationship between the coils 3 to 6 in more detail, the conductor wire starting from the first lead wire 3a passes through the lead insertion hole 19 of the terminal block 12 and the through hole 1 of the core 2.
5 into a first annular groove 7 in which it is wound a number of times counterclockwise in FIG.
Next, the core is guided to the second annular groove 8 through the core notch 23 extending from the first annular groove 7 to the second annular groove 8 shown in FIG. It is wound several times in the same direction, and is then led out onto the terminal block 12 through the through hole 16 and lead insertion hole 20, and then through the adjacent lead insertion hole 21 and through hole 17 into a third annular shape. It is guided into the groove 9, where it is wound a number of times in a counterclockwise direction as shown in FIG. After being wound, the terminal block 1 is passed through the through hole 18 and the lead insertion hole 22.
It is derived on top of 2. By flowing currents in opposite directions to adjacent coils in this manner, it becomes possible to efficiently attract the magnetic plate 13 by the stator 1.

[Problem that the invention attempts to solve]

By the way, in the past, the terminal block 12 was fixed to the core 2 with an adhesive 29, so when the adhesive 29 deteriorates and vibrations or shocks are applied to the stator 1, the terminal block 12 separates from the core 2. I was afraid. Moreover, if the bonding state between the core 2 and the resin 11 deteriorates, the coils 3 to 6 may separate together with the resin 11.

Therefore, an object of the present invention is to achieve robust fixation of the terminal block and coil to the core with a relatively simple structure.

[Means for solving problems]

In an electromagnetic actuator according to the present invention for solving the above problems and achieving the above objects, a recess is provided on the bottom surface of the terminal block. This recess has a portion that corresponds to at least a portion of the through hole for guiding the lead of the magnetic core, and a portion that is continuous with this portion but does not correspond to the through hole. A resin for fixing the coil is filled not only in the coil-accommodating annular groove but also in the through hole and the recess.

[Effect]

When the recessed portion of the bottom of the terminal block is filled with resin as described above, the terminal block and the resin engage with each other, making it difficult for the terminal block to separate. Furthermore, since the recess is formed so as to have a portion that does not correspond to the through hole, the resin filled in the portion that does not correspond functions to prevent the coil from coming off.

〔Example〕

Next, an electromagnetic actuator for a solenoid valve according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. However, in FIGS. 1 to 5, and FIGS. 6, 7, and 11 to 13 showing other embodiments and modifications, the parts common to FIGS. 8 to 10 are The same reference numerals are given and the explanation thereof will be omitted.

The structure of the electromagnetic actuator shown in FIGS. 1 and 2 other than the terminal block 12a and the resin 11 is completely the same as the conventional electromagnetic actuator shown in FIGS. 8 to 10. The terminal block 12a of this embodiment has lead insertion holes 19, 20, 2 as well as the terminal block 12 of FIG.
1 and 22, there are also four recesses 30, 31, 32, 3 on the bottom surface as shown in FIGS. 4 and 5.
3, which is filled with resin 11 as shown in FIG. Four recesses 30, 31, 32, 3
3 is 4 of core 2 shown in detail in FIGS. 9 and 10.
Since the resin 11 corresponds to each of the through holes 15, 16, 17, and 18, for example, by injecting and curing a liquid epoxy resin having an appropriate viscosity, the resin 11 can be reliably and satisfactorily filled into each of the recesses 30 to 33. Filled. The four recesses 30 to 33 are comprised of portions 30a to 33a corresponding to the through holes 15 to 18 of the core 2, indicated by chain lines in FIG. 4, and portions 3 not corresponding thereto.
0b to 33b. Non-corresponding part 30b
33b are continuous with the corresponding portions 30a to 33a, so the resin 11 is also injected there.

A pair of protrusions 3 provided on the top surface of the terminal block 12a
4 has a height corresponding to the upper surface of the core 2. Therefore, if the position of the tip of the protrusion 34 is restricted by the member covering the upper surface of the core 2 when injecting the resin 11, the terminal block 12a will not be misaligned. Furthermore, if a cover (not shown) is provided on the upper surface of the core 2 after the stator 1 is completed, this cover will prevent the terminal block 12a from slipping upward.

In order to attach the terminal block 12a to the core 2, a mounting groove 3 is formed on the top surface of the core 2, as shown in FIG.
5 is provided. This mounting groove 35 is
2a, and has a planar shape that substantially matches core 2a.
It is formed so that it reaches the side of the Therefore, in the non-fixed state, the terminal block 12a can be moved vertically and laterally. Furthermore, it becomes possible to lead out the external lead wire in the side direction using the mounting groove 35.

As is clear from the above, according to this embodiment, the terminal block 12a can be firmly fixed by a simple method and structure in which the recesses 30 to 33 are provided on the bottom surface of the terminal block 12a and the resin 11 is injected therein. and,
Separation of the core 2 of the terminal block 12a in the lateral direction is sufficiently prevented by the engagement between the resin 11 and the terminal block 12a. In addition, the through holes 15 in the recesses 30 to 33
Since the parts 30b to 33b that do not correspond to parts 30b to 33b are also filled with resin, the resin parts filled in these parts 30b to 33b function as parts for preventing the coils 3 to 6 and the resin 11 from separating downward in FIG. 1. . That is, even if the resin 11 tries to escape downward in FIG. 1, it cannot escape because the resin in the portions 30b to 33b hits the core 2.

FIG. 6 shows a part of an electromagnetic actuator according to another embodiment of the present invention, and FIG. 7 shows a terminal block 12b used here. In this example, the seventh
As is clear from the figure, convex portions 36, 37, 38, 39 are provided on the bottom surface of the terminal block 12b, and these are connected to the through holes 15, 16, 1 of the core 2 as shown in FIG.
7 and 18, respectively, and the resin 11 is filled around them. Further, recesses 30 to 33 are provided so as to surround the projections 36 to 39, and the recesses 3
A portion of 0 to 33 corresponds to through holes 15 to 18,
The remaining parts correspond to each other and are filled with resin 11, respectively. Therefore, similar to the embodiments of FIGS. 1 to 5,
A state of engagement occurs between the terminal block 12b and the resin 11, and the terminal block 12b and the coils 3 to 6 are not easily separated.

Note that in this example, the terminal block 12b for the core 2
positioning is easily achieved.

[Modified example]

The present invention is not limited to the above-described embodiments, but can be modified as follows, for example.

(a) As shown in FIGS. 11 and 12, two through holes 15 and 16 and 17 and 1 in the core 2
The recesses 40 and 41 connecting the terminal blocks 12c
It is also possible to provide the resin 11 on the bottom surface of the holder and fill it with resin 11.

(b) As shown in FIG. 13, the recesses 30 to 33 on the bottom surface of the terminal block 12d may be formed so as to extend from one side surface to the other side surface of the terminal block 12d.

(c) There is no problem in increasing or decreasing the number of coils 3 to 6.

(d) Lead wires 3a to 6a at one end of each coil 3 to 6
Alternatively, the lead wires at both ends may be led out onto the terminal block 12a and interconnected to obtain a desired current direction on the terminal block 12a.

[Effect of idea]

As described above, according to the present invention, it is possible to easily achieve robust fixation of the terminal block and the coil to the core, and it is possible to prevent the terminal block and the coil from detaching from the core.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a part of an electromagnetic actuator according to an embodiment of the present invention, FIG. 2 is a perspective view showing the stator of FIG. 1, and FIG. 3 is a perspective view showing the terminal block of FIG. 1. Figure 4 is a bottom view of the terminal block in Figure 3,
5 is a sectional view of the terminal block shown in FIG. 3, FIG. 6 is a sectional view showing a part of an electromagnetic actuator according to another embodiment of the present invention, and FIG. 7 is a perspective view of the terminal block shown in FIG. 6. , FIG. 8 is a sectional view showing a part of a conventional electromagnetic actuator, FIG. 9 is a bottom view of the core in FIG. 8, FIG. 10 is a sectional view of the core in FIG. 9, and FIG. 11 is a cross-sectional view of the core in FIG. 12 is a bottom view of the terminal block of FIG. 11, and FIG. 13 is a bottom view of the terminal block of the modified example of the present invention. 1... Stator, 2... Core, 3, 4, 5, 6
... Coil, 3a, 4a, 5a, 6a ... Lead wire, 7, 8, 9, 10 ... Annular groove, 11 ... Resin, 12a ... Terminal block, 13 ... Magnetic plate, 15,
16, 17, 18...through hole, 19, 20, 2
1, 22...Lead insertion hole, 30, 31, 32,
33... Concavity.

Claims (1)

[Claims for Utility Model Registration] Consisting of an assembly of a magnetic core and a coil, and a magnetic body placed opposite to this assembly, by energizing the coil, the gap between the assembly and the magnetic body is The magnetic core has a plurality of annular grooves on one main surface thereof for accommodating the coil, and the lead wire of the coil is connected from the one main surface side. A through hole is formed to be sufficiently larger than the thickness of the lead wire in order to lead out to the other main surface side, and the coil is fixed in the annular groove by resin filled in the annular groove. A terminal block is disposed on the other main surface side of the magnetic core, and the lead wire of the coil is led out onto the terminal block through the through hole and a lead insertion hole provided in the terminal block. In the electromagnetic actuator, a recess is provided on the bottom surface of the terminal block, and the recess has a part corresponding to at least a part of the through hole and is continuous with this part, but is configured so as not to correspond to the through hole. and a portion provided with the resin, the resin is filled not only in the annular groove and the through hole but also in the recess, and the terminal block is fixed to the magnetic core with the resin. Electromagnetic actuator.