JPH0123778Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mold structure for manufacturing a resin molded coil having a terminal fitting embedded in the resin.

Conventionally, when manufacturing resin molded coils with terminal fittings embedded in the resin, holes were provided in the mold for the terminal fitting setting part, and the terminal fittings were fixed from outside the mold.
In addition, a resin molded coil is manufactured by taking steps to prevent leakage of the resin molded coil, but the end face of the terminal fitting of the resin molded coil obtained in this way does not protrude from the cast mold surface, making it difficult to connect with external equipment. At the time of connection, casting resin often adhered to the conductor portion at the connection end, increasing the possibility of connection failure. As a method to improve this point, the embedded terminal should be placed slightly (1 to 3 mm) below the mold resin surface.
degree) is used, but in this case,
The inside of the mold must be recessed only at the terminal portion, or machining dies must be combined, which has the disadvantage that mold machining becomes complicated. Further, in both cases, it is necessary to take measures to prevent resin leakage from the mold at the terminal fitting attachment portion, which has the disadvantage that the work process tends to be complicated.

The present invention eliminates these drawbacks and provides a mold structure that is inexpensive and easy to handle.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings while comparing it with a conventional example. FIGS. 1 and 2 are schematic cross-sectional views of a conventional method for embedding a terminal fitting in a resin.

In the method shown in FIG. 1, a terminal fitting 2 to which a lead wire 3 is connected is fixed to a mold 1 from the outside with bolts 4 through a mold hole, and a resin 5 is injected. At this time, a sealing treatment 6 is performed for the purpose of preventing resin leakage from the gap in the hole through which the bolt 4 is passed. The molded product 7 having the embedded terminal fitting 2 obtained in this way does not protrude from the resin surface as shown in FIG. . A method has been taken to improve the above drawback and make the terminal fitting protrude from the resin surface. A recess 1a was formed in a part of the mold 1, and similarly to the former, a sealing treatment 6 was performed for the purpose of preventing resin leakage, thereby obtaining a cast product 7 as shown in FIG. 2b.

Figure 3 shows the mold system of the present invention, in which the terminal mold 8 has an iron inner plate 9 having a hole into which the outer diameter of the terminal fitting fits, and a hole that is larger than the terminal screw diameter and smaller than the terminal fitting outer diameter. A mold is made of a rubber packing (silicone rubber in the example) 10 and an iron outer plate 11 having the same holes as the holes formed in the rubber packing 10 as a sandwich.
By doing this, the protrusion of the terminal fitting 2 from the resin surface in the finished cast product 7 can be freely taken depending on the thickness of the inner surface plate 9, and furthermore, the packing 10 is in contact with the terminal fitting surface, and the molding Bolt 4 from the outside
Since it is fixed in place, leakage of casting resin can be prevented in the same way as sealing.

In this way, compared to conventional molds, the mold structure of the present invention does not require complicated sealing processes to prevent resin leakage, and does not require engraving processes that tend to increase mold costs. The mold is inexpensive and stable, and a cast product having a highly reliable embedded terminal fitting can be obtained.

[Brief explanation of the drawing]

FIGS. 1a and 1b are a cross-sectional view showing the structure of a mold for manufacturing a conventional resin-molded coil having embedded terminal fittings, and a perspective view of a cast product manufactured using the mold. FIGS. 2a and 2b are a sectional view showing a mold structure according to another conventional example and a perspective view of a cast product manufactured by the mold. FIGS. 3a and 3b are a sectional view showing a mold structure according to an embodiment of the present invention, and a perspective view of a cast product manufactured by the mold. 2...Embedded terminal fitting, 8...Terminal part mold, 9
...Inner plate, 10...Rubber gasket, 11...
External board.

Claims (1)

[Scope of utility model registration request] In a mold for manufacturing a resin molded coil having a terminal fitting embedded in the resin, an inner plate having a hole larger than the outer diameter of the terminal fitting, a rubber packing having a hole larger than the terminal screw diameter and smaller than the terminal outer diameter, and this rubber A mold for producing a resin molded coil, in which a terminal mold is constructed by stacking three outer plates each having a hole approximately the same diameter as the hole formed in the system packing.