JPH0532976Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a plug structure for a synthetic resin bobbin constituting an electromagnet.

2. Description of the Related Art For example, an electromagnet constituting a drive unit of a rotary type flow control valve has a structure in which a coil (not shown) is wound around a synthetic resin bobbin 1 as shown in FIG.

This bobbin 1 has a cylindrical portion 2 and flange portions 3 and 4 at both ends integrally molded, and one flange portion 3 has a thick wall portion 5 in which three terminal pieces 6 are implanted. and configure the plug. Specifically, as shown in FIG. 5, three terminal fitting holes 7 having a substantially rectangular cross section are formed parallel to each other in the thick portion 5, and terminal pieces 6 made of a flat metal plate are press-fitted into each hole. has been done. Here, the tip of the terminal piece 6 has a tapered shape with four tapered surfaces, as shown in FIGS. 6 and 7, so that it can fit into the terminal fitting hole 7. It is designed to be easily inserted.

Problems to be Solved by the Invention However, the conventional configuration described above has the drawback that the press-fitted terminal pieces 6 tend to wobble in the width direction, that is, in the direction of arrow A in the figure, and the position of each terminal piece 6 is unstable. It was hot. If the position of the terminal piece 6 is unstable in this way, it becomes difficult to automate the subsequent winding process and resin molding process. Moreover, if the terminal piece 6 moves after the coil is wound, stress will be applied to the wire.

Although the rattle of the terminal piece 6 can be reduced by making the terminal fitting hole 7 deeper, in this case the diameter of the flange portion 3 must be increased, making it difficult to make the bobbin 1 compact.

Means for Solving the Problems Therefore, this invention forms a thick wall part at one end of a synthetic resin bobbin around which a coil is wound, and a terminal fitting hole having a substantially rectangular cross section that is recessed in the thick wall part. In a synthetic resin bobbin plug structure in which a terminal piece made of a flat strip-shaped metal plate is implanted, the tip of the terminal piece press-fitted into the terminal fitting hole is made such that the thickness thereof gradually becomes thinner. It is characterized in that it is formed into a tapered surface, and both side edges of the tip are formed in parallel straight lines so as to maintain a constant width.

Function In the above configuration, since both side edges of the tip of the terminal piece are parallel and linear, the terminal piece is tightly fitted into the terminal fitting hole in the width direction of the terminal piece. Therefore, wobbling in the width direction is reduced and the insertion position is stabilized.

Embodiment Hereinafter, an embodiment of this invention will be described in detail based on the drawings.

2 and 3 show the terminal piece 6 used in the plug structure of this invention. This terminal piece 6 has tapered surfaces 6a and 6b on both the front and back surfaces of the end portion on the side to be press-fitted into the bobbin 1, as in the conventional case, and is formed so that its thickness becomes gradually thinner. On the other hand, both side edges 6c and 6d of the tip end are not tapered but are formed in parallel straight lines so as to maintain a constant width. Note that the edge portions 6e and 6f on both sides of the tip are extremely slightly chamfered.

FIG. 1 shows a state in which the terminal piece 6 is press-fitted into the terminal fitting hole 7 formed in the thick-walled part 5 of the synthetic resin bobbin 1.
By forming parallel straight lines c and 6d, both side edges 6c and 6d are tightly fitted into the terminal fitting hole 7 up to the tip. Therefore, the terminal piece 6 is prevented from wobbling in the width direction, and its position becomes extremely stable. In other words, the same effect as when the terminal fitting hole 7 is made deeper can be obtained.

Incidentally, since both the front and back surfaces of the tip end are tapered surfaces 6a and 6b, insertion into the terminal fitting hole 7 can be easily performed without any particular difference from conventional ones.

Effects of the invention As is clear from the above explanation, the plug structure of the synthetic resin bobbin according to this invention can prevent rattling of the terminal pieces and variations in their positions, and facilitate automation of the winding process, etc. At the same time, it is possible to prevent problems such as disconnection due to rattling of the terminal piece.
Furthermore, since it is no longer necessary to make the terminal fitting hole so deep, it is advantageous in terms of downsizing the bobbin.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part showing the plug structure according to this invention, Fig. 2 is an enlarged front view of the main part of the terminal piece,
Fig. 3 is a side view, Fig. 4 is a plan view of the synthetic resin bobbin, Fig. 5 is a sectional view of the main part showing the conventional plug structure, Fig. 6 is an enlarged front view of the main part of the terminal piece, and Fig. 4 is a plan view of the synthetic resin bobbin. FIG. 7 is a side view as well. 1... Bobbin, 6... Terminal piece, 7... Terminal fitting hole.

Claims (1)

[Scope of utility model registration request] A thick walled portion is formed at one end of a synthetic resin bobbin around which a coil is wound, and a terminal piece made of a flat metal plate is implanted into a terminal fitting hole with a substantially rectangular cross section recessed in the thick walled portion. In the plug structure of the synthetic resin bobbin, the tip of the terminal piece press-fitted into the terminal fitting hole is formed into a tapered surface so that the thickness gradually becomes thinner, and both side edges of the tip are formed into a tapered surface so that the thickness thereof gradually becomes thinner. is a synthetic resin bobbin plug structure that is formed in parallel straight lines to maintain a constant width.