JP3952750B2 - solenoid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solenoid for connecting a lead wire of a coil to a terminal provided on a bobbin around which the coil is wound.
[0002]
[Prior art]
Conventionally, for example, in a solenoid used for a solenoid valve that performs fluid control, an enamel wire of a coil wound around a bobbin is connected to a terminal fixed to the bobbin.
[0003]
4 is a schematic view showing a terminal fixed to a bobbin in a solenoid, FIG. 5A is a schematic view showing a state where a lead is wound around the terminal, and FIG. 4B is a sectional view taken along line FF in FIG. is there.
[0004]
In FIG. 4, the enamel wire 102 of the coil is wound around the cylindrical portion of the bobbin 101 and then guided upward from the end portion of the bobbin 101, and is connected at the terminal 104 and the connection portion 105 that serve as the base of the connector terminal 103. Is done.
[0005]
In FIG. 5, the coil enamel wire 102 is wound around the cylindrical portion of the bobbin 101, led upward from the end of the bobbin 101, wound around the terminal 104 several times, The connection is made at the connection part 105.
[0006]
In addition, a resin mold may be applied for the purpose of preventing the control fluid from entering the solenoid having such a configuration or increasing the rigidity of the coil itself.
[0007]
In resin molding, a solenoid (in a coil assembly state) is placed in a molding die, and the outer peripheral portion of the solenoid is covered with a resin material by a method similar to insert molding.
[0008]
[Problems to be solved by the invention]
However, in the case of the prior art as described above, the following problems have occurred.
[0009]
As shown in FIGS. 4 and 5 (a), if the enameled wire 102 is bent at the bent portion 106 immediately before the connecting portion 105, the strength of the portion is lowered, and cracks are easily generated in the bent portion 106. There were cases that led to
[0010]
In addition, as shown in FIG. 5B, when the winding portion of the terminal 104 is the edge 107, the enameled wire 102 is damaged and may be disconnected.
[0011]
In particular, a solenoid valve provided with a solenoid is applied, for example, as a control mechanism of an automobile engine, and therefore always receives vibration. This vibration causes a crack in the bent portion 106 and finally breaks. There is concern.
[0012]
In addition, when the connection portion 105 is resin-molded in the solenoid due to a large change in the ambient environmental temperature, a crack occurs in the bent portion 106 due to the expansion and contraction of the resin due to the temperature change, and finally the wire breaks. There have been cases.
[0013]
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a highly reliable solenoid in which the durability of the connection portion is improved.
[0014]
[Means for Solving the Problems]
In the present invention in order to achieve the above object, the solenoid having been fixed to the bobbin, a pair of terminal leads of the coil wound on the bobbin is the connection processing by thermal caulking at connecting portions Each of the pair of terminals includes a first winding portion around which the lead wire led from the bobbin is wound, a second winding portion around which the lead wire wound around the first winding portion is further wound, and a lead A wire connecting portion for connecting a portion of the wire between the first winding portion and the second winding portion to the terminal, and the first winding portion, the second winding portion, and the connection portion. both in each of said pair of terminals, terminals and opposing surfaces respectively provided on the opposite side, the lead wire wound around the first winding part, before Characterized in that it is guided without bending from the first winding portion to said second winding portion.
[0015]
As a result, strength reduction due to bending can be eliminated, so that the occurrence of cracks and disconnection as in the past can be suppressed even when vibration is applied or expansion and contraction force is generated by the resin mold caused by changes in the ambient environmental temperature. be able to.
[0020]
Also , the expansion and contraction force due to the resin mold caused by vibration and changes in the ambient environmental temperature can be received at the terminal, so the expansion and contraction force is not directly applied to the connection part, but applied to the connection part The generation of stress can be suppressed and the load on the lead wire can be reduced.
[0021]
Furthermore, after the coil is wound around the bobbin and the lead wire is cut, the lead wire is not detached from the connection portion when the connection process is performed.
[0023]
Further , there is no coil winding portion between the coil winding start side terminal and the winding end side terminal, and there is no need to insert a coil winding nozzle between the terminals. The wire winding workability can be improved, and automation is facilitated.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in this embodiment should be appropriately changed according to the configuration of the apparatus to which the invention is applied and various conditions. It is not intended to limit the scope to the following embodiments.
[0025]
FIG. 1 is a schematic view showing a solenoid A (a state before resin molding is performed) according to an embodiment of the present invention, and FIG. 2 is a solenoid B which is a state after resin molding is applied from the state of FIG. FIG. 3A is an enlarged view for explaining a main part of the solenoid according to the present embodiment, FIG. 3B is a cross-sectional view taken along the line A-A in FIG. It is BB sectional drawing of (a).
[0026]
The solenoid A is used, for example, in a solenoid valve that performs fluid control. As shown in FIG. 1, the solenoid A is roughly a bobbin 2, a coil 4 wound around the bobbin 2, and a set of terminals fixed to the bobbin 2. 5 and a connector terminal 6 provided integrally with each of the terminals 5.
[0027]
The bobbin 2 includes a cylindrical portion 3 around which the coil 4 is wound and an end surface 8 provided with a fixing portion 7 to which a set of terminals 5 are fixed.
[0028]
The end face 8 is provided with a notch 10 for guiding an enameled wire 9 as a lead wire of the coil 4 to the upper surface.
[0029]
One set of terminals 5 is fixed to the fixing portion 7 of the bobbin 2 as a pair. The terminal 5 is a bent sheet metal member having a thin plate thickness, and a connector terminal 6 connected to an external connector is provided at the tip of the terminal.
[0030]
As a characteristic configuration of the present embodiment, in one set of terminals 5, a first winding portion 11 in which the enameled wire 9 of the coil 4 is wound around a region other than the opposing regions, and a first winding As an auxiliary winding portion around which the enamel wire 9 wound around the first winding portion 11 is provided on the upper side (in FIG. 1) of the portion 11 (on the side opposite to the bobbin 2 with respect to the first winding portion 11). The second winding part 12 and a connection part 13 for connecting the enamel wire 9 between the first and second winding parts 11 and 12 to the terminal 5 by a connection process are provided.
[0031]
The enameled wire 9 is connected at the connecting portion 13 between the first and second winding portions 11 and 12 while being wound around the first and second winding portions 11 and 12, respectively. As a connection process, it connects by heat caulking (fusing process), and it will be in a state as shown in FIG.3 (b).
[0032]
Therefore, the enameled wire 9 wound around the first winding part 11 is provided without being bent from the first winding part 11 to the connection part 13 and is provided in a substantially linear shape.
[0033]
In the present embodiment, as shown in the figure, in each terminal constituting one set of terminals 5, the first side is formed on the opposite side (surface) to the opposite side (surface), that is, on one side of the terminal. And the 2nd winding parts 11 and 12 and the connection part 13 are provided.
[0034]
The first and second winding portions 11 and 12 have a substantially rectangular cross section, and the corner portion 16 is chamfered with C or R (C or R surface pressing) (FIG. 3 ( c)).
[0035]
Here, in the cross-sectional shape of the 1st and 2nd winding parts 11 and 12, what is necessary is just not the edge shape, and what is necessary is just a shape which does not damage an enamel wire by winding the enamel wire 9 around a winding part.
[0036]
Moreover, although the connector terminal 6 is integrally provided in the terminal 5, it is not restricted to this, What is necessary is just to be electrically connected.
[0037]
Then, the resin mold 14 is applied to the solenoid A shown in FIG. 1 by resin molding in order to prevent the control fluid from entering the coil portion and to increase the rigidity of the coil itself, as shown in FIG. Solenoid B is configured.
[0038]
In resin molding, a coil assembly (solenoid A) is placed in a mold and the outer periphery of the coil assembly (solenoid A) is covered with a resin material in the same manner as in insert molding.
[0039]
Here, the connector terminal 6 comprises the connector part 15 by resin molding.
[0040]
In the solenoid A configured as described above, the terminal 5 is provided with the first winding portion 11 around which the enamel wire 9 of the coil 4 is wound, and the enamel wire 9 is bent from the first winding portion 11 to the connection portion 13. Therefore, the strength of the enameled wire 9 is not reduced, and the occurrence of cracks and breakage of the enameled wire 9 can be reduced.
[0041]
Therefore, in the case where vibration is always applied, even if stress is applied due to vibration, the occurrence of cracks and breakage of the enameled wire 9 can be reduced.
[0042]
Even in the solenoid B with the resin mold applied, the enamel wire can be used even if stress is applied by the expansion / contraction force (direction E shown in FIG. 3A) by the resin mold 14 caused by the change in the ambient temperature. 9 is suppressed, and the load on the enameled wire 9 can be reduced.
[0043]
In addition, since the cross-sectional shape of the first and second winding portions 11 and 12 provided in the terminal 5 has no edge, the enamel wire 9 is damaged or cracked when the enamel wire 9 is wound around the winding portion. Can be prevented from occurring.
[0044]
Further, in the terminal 5, a second winding portion 12 is provided on the opposite side of the bobbin 2 with respect to the first winding portion 11, and a connection portion is provided between the first winding portion 11 and the second winding portion 12. 13 is provided, even if vibration is applied or an expansion / contraction force is generated by the resin mold 14 due to a change in the ambient temperature, the terminal 5 can receive these stresses. Is not directly applied, and the occurrence of stress on the connection portion 13 can be suppressed. Accordingly, it is possible to prevent the connection portion 13 from cracking and reduce the load on the enameled wire 9.
[0045]
In addition, conventionally, since the enameled wire 102 is not fixed when moving to the fusing (heat caulking) process after winding the coil, the enameled wire 102 may come off from the connecting portion 105 and may not be connected. If the 2nd winding part 12 is provided like this Embodiment and the connection part 13 is provided between the 1st winding part 11 and the 2nd winding part 12, the coil 4 is wound around the bobbin 2 and enamel After the wire 9 is cut, the enameled wire 9 is not detached from the connection part 13 when moving (transferring) to the connection process (fusing process).
[0046]
Further, conventionally, as shown in FIG. 5A, in the case of the terminal 104 integrated with the connector terminal 103, the gap between the coil winding start and winding end terminals 104a and 104b is small, so It is difficult to wind around the terminal, the workability is poor, and similarly, the gap between the terminals 104a and 104b is small, so that the coil winding nozzle does not enter and automation is difficult . As shown in this embodiment, a winding portion is provided on the surface opposite to the surface of each of the pair of terminals 5 so that the coil winding start side C and the winding end side D terminals 5 Even if the gap is small, the workability of winding the enamel wire 9 can be improved, and automation is also facilitated.
[0047]
In the present embodiment, the second winding portion 12 is provided on the opposite side of the bobbin 2 with respect to the first winding portion 11, and the enamel wire 9 is attached to the first and second winding portions 11 and 12. in a state wound respectively, since the connection processing at connection portions 13 between the first and second winding portions 11, 12, enameled wire 9 wound around the first winding portion 11, a first Ru is provided without bending the wound portion 11 to the connecting portion 13.
[0048]
【The invention's effect】
As described above, according to the present invention, the first winding portion, the second winding portion, and the connection portion are all surfaces of the pair of terminals that are opposite to the opposing surfaces of the terminals. Therefore, it is easy to automate the winding operation of the enamel wire (lead wire), and the enamel wire is provided without bending from the winding portion to the connection portion. Therefore, the strength reduction due to the bending of the enameled wire can be eliminated, so even if vibration is applied or the expansion / contraction force is generated by the resin mold caused by changes in the surrounding environmental temperature, the conventional cracks and disconnections are not generated. It is possible to provide a highly reliable solenoid that can suppress the durability of the connection portion.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a solenoid A according to an embodiment of the present invention.
FIG. 2 is a schematic view showing a solenoid B according to an embodiment of the present invention.
3A is an enlarged view for explaining a main part of the solenoid according to the present embodiment, FIG. 3B is a cross-sectional view taken along the line AA in FIG. 3A, and FIG. 3C is a cross-sectional view taken along the line BB in FIG. It is sectional drawing.
FIG. 4 is a schematic view showing a terminal constituting a solenoid according to the prior art.
5A is a schematic view showing a state in which a lead is wound around a terminal constituting a solenoid according to the prior art, and FIG. 5B is a sectional view taken along line FF in FIG. 5A.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solenoid 2 Bobbin 3 Cylindrical part 4 Coil 5 Terminal 6 Connector terminal 7 Fixed part 8 End surface 9 Enamel wire 10 Notch part 11 First winding part 12 Second winding part 13 Connection part 14 Resin mold 15 Connector part 16 Corner part

Claims (1)

Is fixed to the bobbin, the solenoid having a pair of terminal leads of the coil wound on the bobbin is the connection processing by thermal caulking at connection portions,
Each of the one set of terminals includes a first winding portion around which a lead wire led from the bobbin is wound, a second winding portion around which a lead wire wound around the first winding portion is further wound, A connection portion for connecting a portion between the first winding portion and the second winding portion to the terminal ,
The first winding portion, the second winding portion, and the connection portion are all provided on the surface on the opposite side of the surface facing the terminal in each of the one set of terminals,
The solenoid, wherein the lead wire wound around the first winding portion is guided without bending from the first winding portion to the second winding portion.

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