JP2001267124A - Structure of fusing terminal of electromagnetic valve coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the structure of the fusing terminal of an electromagnetic valve coil which is not disconnected at a fusing connection part even though the fusing terminal undergoes a repeat of a sudden temperature change. SOLUTION: The structure of a fusing terminal of an electromagnetic valve coil is that in the electromagnetic valve coil formed by covering a packaged insulating member 5 of a bobbin 1 having a winding end terminal 3 and a winding start terminal 4, which are fused for connection with a conductor wire 2, into a protruded form with a molding made of a synthetic resin, projected stoppers 3b and 4b are provided on the points of arms 3a and 4a of the terminals 3 and 4. When the arms 3a and 4a are respectively bent to fix the point 2a of the conductor wire 2 by caulking, the amount of crushing of the point 2a of the wire 2 is regulated by the stoppers 3b and 4b and the fusing terminal is connected with the bobbin by fusing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure of a solenoid valve coil which is used for opening and closing a fluid passage for intake of an engine of an automobile and which receives a rapid temperature change.

[0002]

2. Description of the Related Art FIG. 1 is a longitudinal sectional view showing a general solenoid valve coil. FIG. 2 is a longitudinal sectional view showing a general solenoid valve coil before mold forming. FIG. 6 is a cross-sectional view showing a conventional bobbin flange before mold forming, and is a sectional view corresponding to the line AA in FIG. As shown in FIG. 1 and FIG. 6, the solenoid valve coil hooks the lead wire 2 on the arm 4 a of the solder-plated terminal 4 fitted to the bobbin 1 while maintaining a constant tension. The end of the cylindrical portion of the bobbin 1 is brought into contact with the end of the cylindrical portion of the bobbin 1 on the side of the flange 1a, and is necessarily inserted into the groove 1c by the tension of the conductive wire 2 so that the subsequent winding does not contact the conductive wire at the beginning of winding. The winding of the conductive wire 2 is started in a layered manner, and at the end of the winding, the conductive wire 2 is brought to the end of the bobbin. By the tension of the conductive wire 2, the conductive wire is arranged in a shape following the shape of the bobbin flange. As shown in FIG. 7, the arm portions 3a, 4a were each bent, and the lead wire end portion 2a was caulked and fixed. Also, the corners of the conductor contact portions 3c, 4c when the arms 3a, 4a were swaged were edge-shaped as shown in FIG. Then, the electromagnetic coils shown in FIG. 1 are manufactured by connecting them by fusing and molding the outside of the terminals 3 and 4 with a sheath insulating member 5 made of a synthetic resin in a shape of protruding the terminals 3 and 4.

[0003]

In the above-mentioned conventional solenoid valve coil, the fusing connection part is formed by the terminal arm part 3.
Due to the position of the wire tip 2a in the positions 4a and 4a or the insufficient capacity of the equipment, the amount of squeezing of the wire tip 2a varies greatly, and in particular, the flatness of the wire due to excessive crushing occurs. In such an electromagnetic valve coil, when abrupt temperature changes are repeated, the terminal end is increased or decreased due to the difference in the coefficient of thermal expansion between the bobbin 1 and the conductive wire 2 due to the increase or decrease in the tension of the conductive wire 2 generated at each temperature change. Parts 3c, 4c and conductor 2 or
The shearing force caused by the large relative angle α between the conductive wire portion 2a fixed to the terminal by fusing and the conductive wire 2 not fixed is repeatedly applied, and the conductive wire 2 is connected to the terminal end 3.
c, damaged by the edge of 4c, lead wire end 2a
There is a problem that the overstretching promotes a decrease in the tensile strength of the conductive wire 2 itself, and as a result, disconnection occurs at the fusing connection portion. The present invention has been made in order to solve the above-mentioned problems, and has an object to obtain a solenoid valve coil which is excellent in workability and profitability and hard to be disconnected without changing the number of parts and processes. .

[0004]

According to a first aspect of the present invention, there is provided a fusing terminal structure for a solenoid valve coil comprising a bobbin 1 having a winding end terminal 3 and a winding start terminal 4 in which a conductor 2 is fusing-connected. In an electromagnetic valve coil formed by covering the exterior insulating member 5 with a synthetic resin mold,
At the ends of the arms 3a, 4a of the terminals 3, 4, convex stoppers 3b, 4b are provided, and when the arms 3a, 4a are bent, the lead ends 2a are fixed by caulking.
The amount of squeezing of the wire tip 2a is restricted by the stoppers 3b and 4b, and the wire is connected by fusing.

Further, the fusing terminal structure of the solenoid valve coil according to the second invention comprises a flange 1a of the bobbin 1.
A slanting groove 1b for inserting the conductor at the end of winding is provided to reduce the relative angle α between the conductor 2 and the tip 2a of the conductor, and the conductor contact part 3 when the arms 3a and 4a are swaged.
3. The feature according to claim 1, wherein the corners of c and 4c are formed as curved surfaces.

According to the present invention, a stopper function is provided for regulating the amount of squeezing of the lead wire end portion 2a. Even when tension is generated in the lead wire 2, the lead wire 2 is inserted into the inclined groove 1b of the bobbin 1 and a terminal is provided. By making the fusing portion 3 outside, the relative angle α between the terminal end portion 3c and the conducting wire 2 or the conducting wire tip portion 2a fixed to the terminal by fusing and the conducting wire 2 not fixed is moderated. Arm 3
By making the corners of the conductor contact portions 3c and 4c at the time of caulking a and 4a curved, the conductor 2 is prevented from being damaged by the edge.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. The bobbin 1 is for winding the conductive wire 2 in a layered form, and terminals 3 and 4 are fitted on the side surface of the lower flange 1a of the bobbin 1, and the upper surface (conductive wire winding side).
Are provided with inclined grooves 1b and 1c for arranging the conductive wire 2. That is, the flange 1a of the bobbin 1 is provided with an inclined groove 1b (see FIG. 3) for inserting the conductor after winding to reduce the relative angle α between the conductor 2 and the tip 2a of the conductor. Then, the wire 2 is hooked on the terminal arm 4a in a state where the tension is kept constant by the winding machine, and is applied to the end of the cylindrical portion of the bobbin 1 on the side of the flange 1a. Into the groove 1c, start winding from there, adjust the lead wire 2 to come to the end of the bobbin at the end of winding, and hook the lead wire 2 on the terminal arm 3a. The conductor 2 is inserted into the inclined groove 1b.

Further, at the tips of the arms 3a and 4a of the terminals 3 and 4, there are provided stoppers 3b and 4b having a convex shape. When caulking is fixed, the stopper 3b,
4b regulates the amount of squeezing of the wire tip 2a. Therefore, when the terminal arms 3a and 4a are compressed and deformed so that the conductor 2 does not come off, the caulked portion of the conductor does not become flat. Next, as in the conventional case, a step of cutting off the excess conductor 2 is continuously performed. Thereafter, the terminal arms 3a, 4a and the conductor 2a are connected by fusing. The corners of the conductor contact portions 3c and 4c when the arms 3a and 4a are swaged are formed into curved surfaces. In addition, since the molding of the curved surfaces 3c and 4c of the conductor contact portion can be incorporated in the terminal manufacturing process, the cost does not increase.

At this time, the conductor 2a is pulled by the tension of the conductor 2
It fits in the space formed by the stoppers 3b and 4b in the terminal arms 3a and 4a, and the end of the conductor 2a is connected to the ends 3c and 4c of the terminal arms.
Will come into contact with the curved surface portion. Thereafter, it is for covering the outer peripheral portion of the bobbin 1 in which the terminals 3 and 4 are provided in a projecting shape. For example, it is molded with an exterior insulating member 5 such as PBT, and the coil body has moisture resistance, flame resistance, and ignition resistance. And environmental resistance.

In the above-described embodiment, the coil used for driving the solenoid valve has been described. However, the application is not necessarily limited, and the present invention is applied to all the terminals and the conductors which need to be hardly broken. It goes without saying that you can do it.

[0011]

The lead wire 2a fits into the space defined by the stoppers of the terminal arms 3b and 4b, so that the tensile strength does not decrease due to the flattening due to excessive crushing. 1b and the fusing portion of the terminal 3 is located outside, so that the terminal ends 3c, 4c
Relative angle α between the conductor 2 or the conductor 2a fixed to the terminal by fusing and the conductor 2 not fixed.
Is gentle, so that the terminal ends 3c, 4c and the conductor 2 or the conductor 2a fixed to the terminal by fusing and the conductor 2 not fixed are hardly subjected to shearing force. 4, an end 3c of the terminal arm, which is a contact portion of 4,
Since the conductor 4c is a curved surface, the end of the conductor 2a on the bobbin side is less likely to be damaged by the edges of the ends 3c and 4c of the terminal arm, and the disconnection can be suppressed.

[0012]

According to the solenoid valve coil of the present invention, the stoppers 3b and 4b provided on the terminals 3 and 4 themselves determine the amount of squeezing of the conductor 2a, thereby reducing the decrease in tensile strength due to the flattening of the conductor 2a. The terminal 2 is fixed to the terminal end 3c and the conductor 2 or the conductor 2a fixed to the terminal by fusing because the conductor 2 is inserted into the inclined groove 1b of the bobbin and the fusing portion of the terminal 3 is outside. The relative angle α with the unleaded conductor 2 is gentle, and it is difficult for a shear force to be applied to the terminal ends 3c and 4c and the conductor 2 or the conductor 2a fixed to the terminal by fusing and the conductor 2 not fixed. Further, since the end portions 3c and 4c of the terminal arm portions, which are the contact portions between the conductive wire 2 and the terminals 3 and 4, are curved surfaces, they are hardly damaged by the edges. It becomes difficult. Also, the inclined groove 1b and the groove 1c of the bohin 1 into which the conductor 2 is inserted are integrally formed, and the winding process is the same as before, so that it is difficult to disconnect the electromagnetic wave without increasing the cost. There is an effect that a valve coil can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a solenoid valve coil.

FIG. 2 is a longitudinal sectional view showing a state before mold forming of a solenoid valve coil.

FIG. 3 is a sectional view taken along line AA of FIG. 2 according to an embodiment of the present invention.

FIG. 4 is a sectional view showing a terminal fusing connection part according to the embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a bobbin flange portion (winding end side) before mold forming according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a conventional bobbin flange before mold forming.

FIG. 7 is a longitudinal sectional view showing a conventional terminal fusing connection portion.

FIG. 8 shows a conventional mob of a bobbin flange (winding end side).
FIG. 3 is a vertical cross-sectional view showing a state before molding. 1 bobbin. 1b Inclined groove. 2 conductor. 3 Terminal (winding end side). 3a Stopper. 4 Terminal (winding start side). 5 Exterior insulation member. 6 plates.

Claims (2)

[Claims] A bobbin (1) having a winding end terminal (3) and a winding start terminal (4) in which a conductive wire (2) is connected by fusing.
In the electromagnetic valve coil formed by covering the exterior insulating member 5 with a synthetic resin mold, convex stoppers 3b, 4b are provided at the distal ends of the arms 3a, 4a of the terminals 3, 4. When the arms 3a and 4a are each bent and the conductor tip 2a is caulked and fixed, the stopper 3
A fusing terminal structure for a solenoid valve coil, wherein the amount of squeezing of the leading end portion 2a of the conductor is regulated by b and 4b, and the fusing terminal is connected by fusing. 2. A flange 1a of the bobbin 1 is provided with an inclined groove 1b for inserting a wire at the end of winding to reduce the relative angle α between the wire 2 and the tip 2a of the wire. 2. The fusing terminal structure for an electromagnetic valve coil according to claim 1, wherein the corners of the conductor contact portions 3c and 4c at the time of caulking are formed in a curved surface.