JPH0529117U - Bobbin with pin terminal - Google Patents

Abstract

(57) [Abstract] [Purpose] When a coil using a conventional bobbin with pin terminals is impregnated with a varnish, it is placed laterally beyond the end of the bobbin so that it does not fall out of the through hole of the impregnation jig that holds the coil. The rectangular protrusion that overhangs is removed to reduce the board mounting area, and the bobbin has a pin terminal that allows the core to be mounted horizontally or vertically. A bobbin with a pin terminal, in which a pin terminal 6 is provided on the bottom surface of an end flange 2 at both ends of a rectangular tube core 1, wherein a bobbin with a pin terminal is formed in the lower center of the outer surface of the end flange. Then, inside the through hole 15 of the bobbin of the varnish impregnating jig 14, a supporting rod 18 urged by a compression coil spring 21 fitted in the front recess is provided, and the bobbin with pin terminals is fixed to the jig.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bobbin with a pin terminal forming a transformer and a choke coil, and more particularly to a structure of a bobbin with a pin terminal for facilitating varnish impregnation work.

[0002]

[Prior Art]

 A conventional bobbin with a pin terminal used in a noise prevention choke coil mounted on an electronic device to suppress electromagnetic noise will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is an external perspective view showing a board mounting surface with a bobbin with pin terminals (hereinafter referred to as a bobbin) turned upside down. Thick end flanges 2 are provided at both ends of a rectangular tube core (hereinafter referred to as a core) 1, an intermediate flange 3 is provided at the center of the outer periphery of the core 1, and an outer surface of the end flange 2 is above the core 1. (Below) a vertical groove 4 connected to the inner wall and two lateral grooves 5 connected to the side inner wall are formed, and two pin terminals 6 and a standoff protrusion 7 are formed on the bottom surface (top surface in the figure) of the end collar 2. It is a bobbin with pin terminals in which square protrusions 8 are provided on the lower parts (upper part in the figure) of both side surfaces of the end flange 2. Winding 9 (see FIG. 5) is provided on each of the winding cores 1 on both sides of the intermediate collar 3, and the ends of the winding 9 are bent to the pin terminals 6 and connected by soldering. 10) is inserted into the center hole of the winding core 1, and the base is placed vertically into the vertical groove 4 for assembly, and the core fastening metal fitting is put on to form a common mode choke coil. The base of the core 10 projects outward from the outer surface of the end collar 2. When this coil is impregnated with varnish, it is immersed in a varnish impregnation tank with the pin terminal 6 side facing upward so that the surface of the pin terminal is not coated with varnish. Conventionally, a large number of coils were impregnated at once with a varnish impregnating jig (hereinafter referred to as a jig) 11 as shown in the plan view of FIG. The jig 11 is a flat plate made of a heat-resistant material having a size corresponding to the area of the varnish tank, and a large number of through holes 12 (two in the figure are shown) that are one size larger than the shape obtained by removing the rectangular protrusions 8 from the planar shape of the coil. (Indicated only) are formed in the required arrangement. As shown in the through hole 12 in the upper part of the figure, when the coil with the pin terminal 6 side up is inserted into the through hole 12 from above, the coil is supported by the rectangular protruding piece 8 and the entire U-shaped magnetic core 10 is supported. Then, most of the winding 9 is located below the bottom surface of the jig 11. In this state, the coil was dipped in a varnish bath, pulled up, dried as it was, and then the coil was removed from the jig 11.

[0003]

[Problems to be solved by the device]

 The length of the rectangular protrusion is set so that the coil does not fall out of the through hole of the varnish impregnating jig, so the coil using the bobbin with the rectangular protrusion has a large mounting area. was there. The bobbin shown in FIG. 4 has a structure limited to the case where the core is assembled vertically. When a U-shaped core or E-shaped core is assembled horizontally on a bobbin whose base portion enters the lateral groove 5, two or all four of the four rectangular protrusions are incorporated in the plane shape of the coil. Therefore, even if a through hole suitable for the jig is formed and the coil is inserted from above, the square protrusion cannot support the coil. Since it is not possible to insert the pin terminal 6 side from the lower surface into the through hole 12 of the jig 11 shown in FIG. 5, in the case of horizontally assembling the core, a rectangular protrusion which is sufficiently longer than that shown in FIG. 4 is provided. There was also the problem of having to prepare another bobbin.

[0004]

[Means for Solving the Problems]

 A bobbin with a pin terminal according to the present invention has a recess formed at the center of the lower part of the outer surface of an end flange on which the pin terminal is hung. It is characterized in that a rod is provided to hold the bobbin with the pin terminal.

That is, the present invention provides a bobbin with a pin terminal in which end flanges are provided at both ends of a rectangular tube-shaped core, and pin terminals are vertically provided on the bottom surface of the end flange. The bobbin with a pin terminal is characterized in that a recess is formed in the center of the lower part.

[0006]

[Action]

 The recess of the end flange is buried in the opposing wall of the through hole of the varnish impregnating jig and engages with the free end of the support rod that is biased so that it can move back and forth, and the coil is placed horizontally with the pin terminal side facing upward. It works as an engaging part that keeps

[0007]

【Example】

 FIG. 1 shows an embodiment of the bobbin with pin terminals according to the present invention, which is upside down like FIG. The same parts as those in FIG. 4 are designated by the same reference numerals. A vertical groove 4, a horizontal groove 5 and a circular recess 13 are formed on the outer surface of the end flange 2. The position of the recess 13 is at the center of the lower portion (upper portion in the figure) of the end collar 2. Two pin terminals 6 and stand-off protrusions 7 are provided on the bottom surface of the end collar 2. The winding core 1 of the bobbin is separately wound with two windings 9 (shown by a chain line in FIG. 1), and the U-shaped core 10 shown by a chain line is inserted into the vertical groove 4 with the base vertical to form a closed magnetic circuit. Assembly Make a choke coil by fixing with a core tightening fitting (not shown).

FIG. 2 is a plan view of an example of a varnish impregnating jig 14 used for this coil, showing two coils. FIG. 2 shows a state in which a coil is attached to the upper through hole 15, and FIG. 3 shows a vertical sectional front view in that state. The jig 14 is a thick plate made of a heat-resistant material, and has a rectangular through hole 15 which is slightly larger than the bottom shape of the bobbin in FIG. A circular hole 16 is formed perpendicularly to. The circular hole 16 is composed of a large diameter portion 17 having a large diameter up to the middle and a small diameter portion on the hole bottom side. The diameter of the small diameter portion is the same as the diameter of the recess 13 of the bobbin. The support rod 18 is a round bar that fits into the small diameter portion, and has a circular collar 19 that fits into the large diameter portion 17 in the middle. The cover plate 20 has the same shape and size as the inner wall of the short side, and a through hole having the same diameter as the small diameter portion is formed corresponding to the circular hole 16. A compression coil spring (hereinafter referred to as a spring) 21 is put in the hole bottom of the circular hole 16, that is, a small diameter portion. As shown in FIG. 3, the length of the spring 21 in the free state is such that one end of the support rod 18 is fitted in the small diameter portion and the circular collar 19 is fitted in the large diameter portion 17 so as to be flush with the inner wall of the short side. It is a size that is slightly compressed when it is pressed. The other end of the support rod 18 is inserted into the through hole of the cover plate 20 to fix the cover plate 20 to the inner wall of the short side. As shown in the lower through hole 15 in FIG. 2, the tip of the support rod 18 has a hemispherical shape and the other end projects from the short side inner walls (cover plate 20) on both sides. The space between the other ends is the same as the space between the bottom faces of the recesses 13 of the bobbin. The support rod 18 is biased by a spring 21 so as to move toward the center of the through hole 15, and a circular collar 19 is always in contact with the cover plate 20. The support rod 18 can be retracted from the through hole 15 against the urging force of the spring 21 until the circular collar 19 contacts the bottom of the large diameter portion 17. This retractable distance is set to be sufficiently larger than the depth of the recess 13.

Since the jig 14 has such a structure, when the coil is pressed into the through hole 15 from the bottom surface or the bottom surface side with the pin terminal 6 side upward (or downward), the stand-off protrusion 7 Comes into contact with the hemispherical end of the support rod 18 to retract the support rod 18, and the hemispherical end slides on the outer surfaces of the standoff projection 7 and the end collar 2 to move forward into the recess 13 to be fitted into the coil. Can be attached to the jig 14. The core 10 as shown in FIG. 3 is placed on the lower side, immersed in a varnish, pulled up, dried, and then the coil is removed from the jig 14. Since the jig 14 can be turned upside down with the coil still attached, the coil is removed in the direction convenient for the next step. The coil is removed from the jig 14 by pulling the coil from the through hole 15 either directly below or above the core. By pulling out, the outer surface of the end collar 2 comes into contact with the hemispherical end of the support rod 18 to retract the support rod 18, and the hemispherical end comes out of the recess 13 and the outer surface of the end collar 2 and the standoff projection 7 is pulled out. It comes in contact with and then moves forward to return to its original position.

Since the coil using the bobbin shown in FIG. 1 is mounted on the varnish impregnating jig 14 from the pin terminal side, the case where the U-shaped core 10 is vertically assembled has been described. Alternatively, it is possible to make a coil in which the E-shaped core is assembled horizontally, and impregnate the varnish in the same manner.

[0011]

[Effect of the device]

 Since the bobbin with pin terminals according to the present invention has a recess instead of the protrusion for impregnating the varnish, a coil with a small mounting area can be made, and a varnish impregnating jig equipped with a support rod that can move back and forth is provided. By using this, it is possible to easily attach and detach and efficiently perform the varnish impregnation work of the coil, and thus it is possible to provide an inexpensive coil suitable for high-density mounting.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a bobbin with pin terminals according to the present invention.

2 is a plan view showing an example of a jig for impregnating a varnish of a coil using the bobbin with a pin terminal of FIG. 1 in a state where a coil is partially mounted.

3 is a vertical cross-sectional front view of a portion where the coil of FIG. 2 is mounted.

FIG. 4 is an external perspective view showing a conventional bobbin with pin terminals.

5 is a plan view of a varnish impregnating jig according to the bobbin of FIG.

[Explanation of symbols]

 1 Square tube core 2 End flange 3 Middle flange 4 Vertical groove 5 Horizontal groove 6 Pin terminal 7 Standoff protrusion 8 Square protrusion 9 Winding 10 C-shaped core 11, 14 Varnish impregnation jig 12, 15 Through hole 13 Recess 16 circular hole 17 large diameter portion 18 support rod 19 circular collar 20 lid plate 21 compression coil spring

Claims (1)

[Scope of utility model registration request] 1. A bobbin with a pin terminal in which end flanges are provided at both ends of a rectangular tubular core, and a pin terminal is provided on the bottom surface of the end flange, at the center of the lower part of the outer surface of the end collar. A bobbin with a pin terminal, characterized in that a recess is formed.