JP2000091143A - Noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure and to facilitate metal plate and coil mounting works by forming a metal plate terminal structure having a U-shaped folded part by using a hollow insulating case with a terminal board constituted by integrating an insulating board and the terminal board. SOLUTION: In a hollow insulating case 1 with a terminal board, an insulating stand 2 is integral with the terminal board 10, and a coil 40 and a circuit element are directly wired to an internal connection extended part 33 of a metal board terminal 30 by using the terminal 30 having a U-shaped folding part 31 easily mountable at a plate-like visor part 12 of the board 10. In this case, a nut 26 is dropped in the part 12 of the board 10, the part 31 of the terminal 30 is press injected, and a screw member 25 is engaged with the nut 26 from above the terminal 3. Further, a circuit element such as a capacitor is contained in a containing recess 4 inside the stand 2, and lead wires of the element are connected to the part 33 of the terminal 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a noise filter used in vending machines, electric vehicles, and the like.

[0002]

2. Description of the Related Art Conventionally, as a noise filter used in vending machines, electric vehicles and the like, components such as coils and capacitors are mounted on a substrate as shown in Japanese Utility Model Application Laid-Open No. 6-9105 and assembled. A board-type noise filter is known.

FIG. 8 shows an example of a board type noise filter disclosed in Japanese Utility Model Laid-Open No. 6-9105. As shown in these figures, a coil 52 is removed from a printed wiring board 51 on which a land pattern is formed. A plurality of small circuit elements 53 are inserted into the fitting holes (not shown) of the substrate 51 for each terminal, and soldered on the back surface of the substrate. Insulated table with legs 6 with space
0, the wiring terminal 54 is bent into the eaves lower part 62 of the insulated terminal base part 61 through the vertical groove 63 and the external connection terminal 7
0 is connected to the lower end 71 to form a two-story arrangement.

[0004]

However, since the conventional board-type noise filter uses a land pattern when constructing a circuit, the area of the land pattern must be increased for a product having a large current specification. In addition, there is a disadvantage that the size of the substrate must be increased. In addition, since the wiring terminals of each element are soldered to the board for each terminal, there are disadvantages that not only the number of mounting locations and the number of steps are increased, but also the amount of solder used is increased.

In addition, since the wiring terminals of each element excluding the coil are soldered on the back surface of the substrate, an insulation distance is required between the substrate type noise filter and the user's housing when used by a user. Therefore, labor such as mounting another component for securing insulation is required. In addition, there is a space on the side surface of the insulating stand with legs on which the coil is mounted, and there is a disadvantage that a distance between components to be mounted adjacently when used in a user housing is required. Further, since the circuit element except for the coil is mounted on the substrate and the coil is mounted on the insulating stand with legs as shown in FIG. 8, there is a disadvantage that two structural parts are used. Further, there is a disadvantage that the wiring terminal of the coil placed on the insulating stand with legs must be bent after passing through the vertical groove and connected to the external connection terminal.

In view of the above, the present invention uses a hollow insulating case with a terminal block and devise a metal plate terminal structure, thereby eliminating the need for a printed wiring board, simplifying the structure, and mounting the metal plate terminals and coils. It is an object of the present invention to provide a noise filter which facilitates work, and further allows circuit elements such as capacitors other than coils to be housed in a case, thereby enabling insulation protection of those circuit elements.

[0007] Other objects and novel features of the present invention will be clarified in embodiments described later.

[0008]

In order to achieve the above object, a noise filter according to the present invention has a hollow insulating base and a plurality of plate-shaped eaves separated from each other by insulating walls. A hollow insulating case with a terminal block having a terminal block portion integrally formed on at least one side surface of the insulating base portion, and a U-shaped bent portion fitted to the plate-shaped eave portion on the external connection side; A metal plate terminal having an internal connection extension extending into the hollow interior of the insulating pedestal; and a plate-shaped eave disposed in a nut arrangement recess formed in the plate-shaped eave portion and having the U-shaped bent portion. A nut sandwiched with the portion, a screw member that passes through the mounting hole of the metal plate terminal and is screwed to the nut, and a lead wire that is disposed on the mounting surface of the insulating base portion and passes through the mounting surface. Drawn into the hollow interior to contact the internal connection extension. It has a configuration in which a coil is.

In the noise filter, it is preferable that a circuit element is housed in the hollow inside of the insulating base, and a lead wire of the circuit element is connected to the internal connection extension.

[0010] It is preferable that the lead wire of the coil is drawn into the hollow interior of the insulating pedestal in a substantially straight line and connected to the internal connection extension.

A guide in a direction perpendicular to the plate-shaped eaves is formed on the insulating wall, and a gap between the plate-shaped eaves and the guide end is slightly larger than a plate thickness of the metal plate terminal. It should be set.

The U-shaped bent portion may be configured such that a convex portion protruding in the width direction is formed on the metal plate terminal.

Further, a bottom insulating cover may be fitted to a bottom surface of the hollow insulating case with a terminal block.

Further, a ground plate may be attached to the outer bottom surface of the bottom insulating cover.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the noise filter according to the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the entire structure of the embodiment, FIG. 2 is a perspective view showing the inside of a hollow insulating case with a terminal block with a bottom insulating cover removed, and FIG. 3 is a plan view of the whole structure. 4 is a front sectional view of the same, and FIG. 5 is an enlarged exploded perspective view of a main part.

In these figures, the noise filter
A hollow insulating case 1 with a terminal block made of, for example, plastic, in which the hollow insulating base 2 and the terminal base 10 are integrated, a bottom insulating cover 20 made of the same material as the case 1, and a metal plate for both external connection and circuit element connection A terminal 30 and, for example, a toroidal common mode choke coil 40 mounted on the upper surface of the case 1
And a storage recess inside the case (the hollow interior of the insulating base 2) 4
And a circuit element 45 such as a capacitor disposed in the control circuit.

The hollow insulating case 1 with a terminal block has a hollow insulating base portion 2 having a rectangular flat coil mounting surface 3 on its upper surface.
And a terminal block 10 integrally formed on at least one side surface (in this example, both side surfaces) of the insulating base 2, and the back side of the insulating base 2 is a storage recess for arranging the circuit element 45. (Hollow interior) 4. Coil 4 on insulating base 2
The through-holes 5 penetrating the coil mounting surface 3 are formed to allow the respective lead-out wires (winding terminals) 41 to pass therethrough. In addition, slit-shaped locking holes (or concave portions) 6 for fitting the bottom insulating cover 20 are formed on both side surfaces of the insulating base 2 where the terminal base 10 is not provided.

The terminal block 10 has a plurality of plate-shaped eaves 12 separated from each other by plate-shaped insulating walls 11 extending in the vertical direction on the side of the insulating block 2. The plate-shaped eave portion 12 is a portion to which the metal plate terminal 30 is attached, and as shown in an enlarged view in FIG. 5, a polygonal member such as a hexagon nut into which a screw member (screw) 25 is screwed is provided on the upper surface of the plate-shaped eave portion 12. A nut arrangement recess 13 for fitting and preventing the nut 26 from rotating is formed, and the nut 26 is housed and arranged therein. A through hole 14 is formed in the center of the nut arrangement recess 13 of the plate-shaped eave portion 12 so that the screw member 25 can pass therethrough. Also, the metal plate terminal 30
A rib-shaped guide 15 is formed on the insulating wall 11 in a direction perpendicular to the plate-shaped eaves 12 so that the plate-shaped eaves 12 can be smoothly attached to the plate-shaped eaves 12. Is set slightly larger than the plate thickness of the metal plate terminal 30.

As shown in FIG. 5, the metal plate terminal 30 has a U-shaped bent portion 31 fitted on the plate-shaped eave portion 12 on the external connection side, and is folded back to the upper surface side of the plate-shaped eave portion 12. The portion serves as a tongue-shaped external connection portion 32. Also, the metal plate terminal 30
Is extended from a side of the U-shaped bent portion 31 that passes through the lower surface of the plate-shaped eave portion 12 and integrally has an internal connection extension portion 33. Further, the metal plate terminal 30 has a U-shaped bent portion 31.
Of the convex portion 34 protruding in the width direction of the U-shaped bent portion 3
1, and is preferably in a sawtooth shape so that the projection 34 is easily inserted into the plate-shaped eaves 12 and difficult to remove. The convex portion 34 functions so that when the metal plate terminal 30 is press-fitted into the plate-shaped eave portion 12, the metal plate terminal 30 is caught by the insulating wall 11 and does not easily fall off. The U-shaped bent portion 31 has a through hole 35 through which the screw member 25 screwed to the nut 26 passes.

The mounting of the metal plate terminal 30 to the terminal block 10 is performed in the following procedure. First, the polygon nut 26 is connected to the terminal block 10.
The metal plate terminal 30 is inserted using the gap T between the guide end of the guide 15 and the plate-shaped eave portion 12, and the U-shaped bent portion 31 is placed in the plate-shaped eave portion 12. Press in so as to pinch. At this time, the convex portion 34 protruding in the width direction of the U-shaped bent portion 31 is in contact with the insulating wall 11 partitioning each plate-shaped eave portion 12 (has been caught), and the metal plate terminal 30 is connected to the plate-shaped eave portion 12. From falling off easily. Furthermore, the metal plate terminal 30
The screw member 25 is screwed into the nut 26 through the through hole 35 from above, so that the tip end of the screw member 25 enters the through hole 14 of the plate-shaped eave portion 12. As a result, the metal plate terminal 30 is mounted on the terminal block 10 without falling off. Although only one metal plate terminal 30 is illustrated in FIG. 1, the metal plate terminal
0 is attached.

The U-shaped bent portion 31 of the metal plate terminal 30
Is an arrangement in which the plate-shaped eaves 12 are sandwiched, and the upper side is a tongue-shaped external connection portion 32 (portion to which a line end such as a power supply line into which a noise filter is inserted) is connected.
5 with the head of the screw member 25 and the external connection portion 3 loosened.
It is a structure that can be connected by inserting the line end between the two and then tightening the screw member 25. Note that a structure in which a spring, a washer, or the like is attached to the screw member 25 as necessary may be employed.

As shown in FIG. 2, the extension 33 for internal connection of the metal plate terminal 30 after being attached to the terminal base 10 is formed sufficiently longer than the external connection part 32 in the form of a tongue. It extends linearly into the storage recess 4 inside 2. This is for the convenience of the connection of the lead wire 41 of the coil 40 and the connection of the circuit element 45, and in order to maintain the insulation distance between adjacent terminals, the extension of the internal connection extension 33 rather than the U-shaped bent portion 31. The width is narrow.

On the other hand, the coil 40 is formed by applying a pair of windings to the toroidal core 42 and extending four lead wires 41 which are winding ends in parallel with the axial direction of the center of the toroidal core 42, respectively. Preliminary solder is applied to each lead wire 41 in advance. Then, the coil 40 is mounted on the coil mounting surface 3 of the insulating base portion 2, and the lead wire 41 is passed through the through hole 5 of the mounting surface 3, and the storage recess of the insulating base portion 2 is formed substantially linearly. 4 and directly connected to the hole of the internal connection extension 33 of the metal plate terminal 30 (if necessary, the internal connection extension 3
3 is subjected to processing such as entanglement and bending).

A circuit element 45 such as a capacitor other than the coil 40 is disposed in the housing recess 4 and is inserted into a hole of the internal connection extension 33 of a predetermined metal plate terminal 30.
Of the internal connection extension 33 together with the lead wire 41 of the coil 40, for example, by spot soldering.

Note that, in order to attach to the customer side housing,
The four corners of the hollow insulating case with terminal block 1 are provided with mounting portions 8 having a reduced height, and mounting holes 7 are formed in each mounting portion 8. Further, a mounting hole 21 corresponding to the mounting hole 7 is formed in the bottom insulating cover 20. The bottom insulating cover 20 is formed with a rising portion 22 that enters the inside of the wall on both sides of the insulating base 2 where the terminal base 10 is not provided. A locking projection 23 that fits into the slit-shaped locking hole (or recess) 6 is formed on the outer surface of the rising portion 22.

Lead wire 41 of coil 40 and circuit element 45
When the soldering of the lead wire to the metal plate terminal 30 is completed, the rising portion 22 of the bottom insulating cover 20 is fitted into the inside of the insulating base portion 2, and the locking convex portion 23 is engaged with the locking hole ( (Or a concave portion) 6 to cover the bottom surface of the hollow insulating case 1 with terminal block with the bottom insulating cover 20 to complete the assembly of the noise filter.

The bottom insulating cover 20 has raised portions 29 on both sides of the terminal block 10 on which the metal plate terminals 30 are provided. The rising portion 29 is set to a height that covers, for example, an intermediate height position of the U-shaped bent portion 31 of the metal plate terminal 30 attached to the plate-shaped eave portion 12, and is formed by using the screw member 25. The insulation of the metal plate terminal 30 is secured when it is attached to the consumer's side housing by covering the side surface of the metal plate terminal 30 without hindering the work of connecting the line ends.

According to this embodiment, the following effects can be obtained.

(1) In the hollow insulating case 1 with a terminal block, the insulating base 2 and the terminal base 10 are integrated, and the plate-shaped eaves 1 of the terminal base are provided.
By using the metal plate terminal 30 having the U-shaped bent portion 31 that can be easily attached to the second 2, the coil 40 and the circuit element 45 are directly connected to the internal connection extension portion 33 of the metal plate terminal, thereby consolidating wiring locations. The circuit element 45 can be housed and connected without using a printed circuit board, so that the number of components can be reduced, the configuration can be simplified, the number of manufacturing steps can be reduced, and the cost can be reduced.

(2) A nut 26 is provided by being dropped into the plate-shaped eave portion 12 of the terminal base portion 10, the U-shaped bent portion 31 of the metal plate terminal 30 is press-fitted, and the screw member 25 is connected to the metal plate terminal 3.
0 is screwed into the nut 26 from above.
6 and the metal plate terminal 30 can be easily mounted.
Can be easily screwed. Further, since the nut 26 is provided between the plate-shaped eaves portion 12 and the U-shaped bent portion 31, the plate-shaped eaves portion 12 and the metal plate terminal 30 do not need to be threaded (tapped). In this respect, also in this point, the production is easy and can contribute to cost reduction.

(3) A circuit element 45 such as a capacitor is housed in the housing recess 4 inside the insulating base 2, and the lead wire of the circuit element 45 can be connected to the internal connection extension 33 of the metal plate terminal 30. In addition, wiring means such as a printed circuit board is not required, and the circuit element 45 is covered with the insulating pedestal 2 so that the circuit element 45 is insulated and isolated from other components when mounted on the consumer side housing. Can be Further, a bottom insulating cover 20 is provided on the bottom of the hollow insulating case 1 with a terminal block.
By fitting, it is possible to reliably perform insulation isolation of the bottom surface portion, and it is possible to directly attach to the housing on the consumer side.

(4) The lead wire 41 of the coil 40 can be drawn substantially linearly into the hollow inside of the insulating base portion 2 and directly connected to the internal connection extension 33 of the metal plate terminal 30. For this reason, the bending process in the middle of the lead wire 41 is unnecessary, and the workability of connecting the lead wire 41 to the metal plate terminal 30 is good. In particular, the coil 40
The work is easy even when the current carrying capacity is large and the winding wire used is thick.

(5) The plate-like eaves 12 can be insulated and isolated from each other by the insulating wall 11. Further, the plate-shaped eaves portion 1 of the terminal block portion 10
A rib-shaped guide 15 perpendicular to 2 is formed on the insulating wall 11, and a gap T between the plate-shaped eaves portion 12 and the guide end of the guide 15 becomes slightly larger than the plate thickness of the metal plate terminal 30. Therefore, the metal plate terminal 30 is utilized by utilizing the gap T.
Can be smoothly inserted into the plate-shaped eave portion 12, and the assembling workability can be improved.

(6) A convex portion 34 projecting in the width direction of the U-shaped bent portion 31 is formed on the metal plate terminal 30, and the convex portion 34 hits the insulating wall 11 partitioning the plate-shaped eaves 12. (Catch), it is possible to hold the metal plate terminal 30 so that the metal plate terminal 30 does not easily fall off the plate-shaped eaves 12 during assembly.

FIGS. 6 and 7 show another embodiment of the present invention. In this case, the ground (ground) plate 46 is provided on the outer bottom surface of the bottom insulating cover 20. Ground plate 4
6 has an inverted L engaging with a corner 20a of the bottom insulating cover 20.
A character-shaped engaging portion 49 and a cut-and-raised portion 47 are formed, and a mounting hole 48 is formed in the cut-and-raised portion 47. And
The ground plate 46 engages the engaging portion 49 with the corner portion 20 a of the bottom insulating cover 20, inserts the cut-and-raised portion 47 through the square hole 24 formed in the bottom insulating cover 20, and inserts the cut-and-raised portion 4.
7 is brought into contact with the lower surface side of the metal plate terminal 30, the screw member 25 is passed through the square hole 24, the mounting hole 48, the plate-shaped eaves 12
And is screwed into a polygonal nut 26 fitted in the nut arrangement recess 13 to be fixed. Other configurations are the same as those of the above-described embodiment, and the same or corresponding portions are denoted by the same reference characters.

Although not shown in FIG. 6, the screw member 25 is mounted in the same direction as in FIG. 1 except for the screw member 25 for mounting the ground plate 46.

According to the embodiment shown in FIGS. 6 and 7,
The ground can be taken out from the bottom side of the bottom insulating cover 20 through the ground plate 46, and can be directly connected to the customer's housing, etc., which can facilitate the ground connection.

In some applications, the ground may be taken out using the screw member 25 screwed from the bottom side of the bottom insulating cover 20 without using the ground plate 46 shown in FIGS.

In each of the above embodiments, the toroidal common mode choke coil 40 is exemplified as the coil. However, the coil structure is not limited to this, and a coil structure according to the use of the noise filter can be adopted.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. There will be.

[0042]

As described above, according to the noise filter of the present invention, a hollow insulating case with a terminal block is used, in which the insulating table and the terminal block are integrally formed of plastic or the like. It is possible to simplify the configuration with fewer components than the board type, work with less man-hours, and obtain a noise filter that is less expensive than in the past. In addition, the use of the metal plate terminal having the U-shaped bent portion and the extension portion for the internal connection makes it possible to greatly reduce the number of wiring locations and soldering locations. In addition, the use of a hollow insulating case with a terminal block and a bottom insulating cover that covers the bottom surface facilitates the design and manufacture of a small-sized and large-current device.

Therefore, the effects of being less expensive, requiring less man-hours, and having high safety can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an overall configuration of a noise filter according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration inside a hollow insulating case with a terminal block with a bottom insulating cover removed in the embodiment.

FIG. 3 is a plan view of the overall configuration of the embodiment.

FIG. 4 is a front sectional view of the same.

FIG. 5 is an enlarged exploded perspective view of a main part of the embodiment.

FIG. 6 is an exploded perspective view showing a main part of another embodiment of the present invention.

FIG. 7 is a sectional view of an essential part of the same.

FIG. 8 is a perspective view of a conventional substrate-type noise filter.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Hollow insulating case with terminal block 2 Insulating table section 3 Coil mounting surface 4 Storage recess 5, 14 Through hole 6 Locking hole (or recess) 7, 21 Mounting hole 8 Mounting section 10 Terminal block section 11 Plate insulating wall 12 Plate-shaped eaves 13 Nut arrangement recess 15 Guide 20 Insulating cover 22, 29 Rise 23 Locking projection 24 Square hole 25 Screw member 26 Polygon nut 30 Metal plate terminal 31 U-shaped bent portion 32 Tongue-shaped external connection portion 33 Extension portion for internal connection 34 Convex portion 35 Through hole 40 Toroidal common mode choke coil 41 Lead wire 42 Toroidal core 45 Circuit element 46 Ground plate 47 Cut-and-raised portion 48 Mounting hole 49 Engagement portion

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 27/28 H01F 15/00 D 27/40 15/10 J F-term (Reference) 5E043 AA09 AB01 EA01 EA06 EB01 EB02 EB05 EB06 5E058 DA06 DB05 DB10 5E070 AA05 AA20 AB01 AB10 BA14 DA02 DA03 DA20 DB08 EA02 EA10 EB01

Claims (7)

[Claims] 1. A terminal block having a hollow insulating base and a plurality of plate-shaped eaves separated from each other by insulating walls and integrally formed on at least one side surface of the insulating base. A metal plate having a hollow insulating case with a terminal block having a U-shaped bent portion fitted to the plate-shaped eave portion on the external connection side and having an internal connection extending portion extending inside the hollow of the insulating base portion. A terminal, a nut disposed in a nut arrangement recess formed in the plate-shaped eave portion, and a nut sandwiched together with the plate-shaped eave portion by the U-shaped bent portion; and A screw member screwed to the nut; and a coil disposed on the mounting surface of the insulating pedestal portion, wherein a lead wire passes through the mounting surface, is drawn into the hollow interior, and is connected to the internal connection extension. A noise filter comprising: 2. The noise filter according to claim 1, wherein a circuit element is housed in the hollow inside of the insulating base, and a lead wire of the circuit element is connected to the internal connection extension. 3. The noise filter according to claim 1, wherein the lead wire of the coil is drawn substantially linearly into the hollow interior of the insulating pedestal and connected to the internal connection extension. 4. A guide in a direction perpendicular to the plate-shaped eave portion is formed on the insulating wall, and a gap between the plate-shaped eave portion and the guide end is smaller than a plate thickness of the metal plate terminal. The noise filter according to claim 1, 2, or 3, wherein 5. The metal plate terminal according to claim 1, wherein a convex portion protruding in a width direction of the U-shaped bent portion is formed on the metal plate terminal.
The noise filter according to 2, 3, or 4. 6. A bottom insulating cover is fitted to a bottom surface of the hollow insulating case with a terminal block.
The noise filter according to 4 or 5. 7. The noise filter according to claim 6, wherein a ground plate is attached to an outer bottom surface of said bottom insulating cover.