JPH11339620A - Current-carrying switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a terminal structure capable of being efficiently housed within a relay case in a relay structure using a terminal rod shaft having a large current capacity. SOLUTION: This current-carrying switch comprises an insulating base 10 constituting a part of a housing case to insert a pair of output terminal rod shafts 11 through, the output rod terminals 11 having flat mounting pieces integrated on the tips and rod parts to be inserted through the insulating base 10, and a pair of bent plate output terminal pieces 12, 13 conductively connected to the respective output terminal shafts in the case inside the end part of the insulating base. Contact plate parts of the form corresponding to the flat mounting pieces on the tips of the output terminal shafts are provided on one-side ends of the bent plate output terminal pieces, and the movable contact-side other ends of the output terminal pieces are mounted on the flat tips of the output shafts with the bent parts being turned toward the center of the case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay, and more particularly to a switch structure suitable as an energizing switch for a starter for an internal combustion engine used to operate a starter for starting an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a magnet switch using a plunger type solenoid is often used as a starter used to start an internal combustion engine. In this type of magnet switch, Japanese Utility Model Laid-Open Publication No.
No. 1, JP-A-55-15707, JP-A-55-15707
As disclosed in, for example, Japanese Patent Application Publication No. -15709, the inside ends of a pair of output terminal shafts, which are attached so as to pass through an insulating base made of synthetic resin, are formed in a plate shape having a plate surface orthogonal to the axis. A plunger is arranged in the insulating base between the pair of output terminal shafts in parallel with the axial direction of the output terminal shaft, and is configured to be movable in parallel with the axial direction depending on the excitation state of the solenoid. Then, the tip of the plunger comes into contact with the pair of output terminal shafts so that the pair of output terminal shafts are electrically connected to each other. The output terminal shaft has a round shaft shape, and a male screw is engraved on an outer portion protruding outside the insulating base. An O-ring, a flat washer, and a spring washer are sequentially inserted through the male screw, and these are fastened to an insulating base by a nut.

On the other hand, a hinge type electromagnetic relay is used as an energizing switch in applications where the power supplied to the starter is relatively small, such as a 50 cc motorcycle. This electromagnetic relay is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 61-11605.
No. 1, Japanese Utility Model Application Laid-Open No. Sho 62-139045, an electromagnetic coil connected to a pair of input terminal pieces, a yoke joined to one electrode of the electromagnetic coil, and a hinge with respect to the yoke. A movable piece that is movably connected by the structure and is configured to contact and separate from the other electrode of the electromagnetic coil, a movable contact connected to the movable piece, and one of which is electrically connected to the movable contact, Are provided with a pair of output terminal pieces having fixed contacts facing the movable contacts. In the relay, the outer end portion, which is the socket insertion portion of the input terminal piece and the output terminal piece, is formed in a thin plate shape in which the thin insertion portion of the insulating base is directly extended in the insertion direction. The conventional energizing switch using the above-mentioned electromagnetic relay is advantageous in that when used as a starter for starting a small internal combustion engine such as a motor-driven bicycle, it is lighter, smaller and requires less control power than a magnet switch. It is.

However, in the conventional energizing switch using the above-mentioned electromagnetic relay, when used as a starter for starting a small internal combustion engine such as a motor-driven bicycle, it is lighter and smaller than a magnet switch and has a smaller control power. Although this is convenient because it is small, if it is used as it is for a large motorcycle or a passenger car, the power supply capacity becomes insufficient, and there is a possibility that overheating or insulation failure may occur.
In particular, the output terminal strip has a plate-like shape that is almost the same as that of a normal hinge-type small relay, so that sufficient current capacity cannot be secured at the connection between the output terminal strip and the starter, and insulation due to overheating occurs. There is a risk of deformation or burnout of the base.

In order to improve this and to ensure a sufficient current capacity of the terminal piece, a configuration in which a rod-shaped terminal shaft is inserted through an insulating base has been proposed by the same inventor. (See Japanese Utility Model Laid-Open Publication No. 59-23137.) In the present invention, as shown in FIG. 5, a terminal rod 47 is inserted through a hole 44b of an insulating base 44, and as shown in FIG. The mounting piece 46 is fixed to the small-diameter projection 47a by caulking or welding. Reference numeral 45 denotes a contact, and reference numeral 44a in FIG. 5 denotes a concave portion provided on the insulating base. The mounting piece 46 is inserted into the recess 44a when the terminal shaft is inserted.
Are fixed so that they do not fit and rotate. In this conventional example, the terminal shaft has a rod shape, and a large current capacity can be obtained. However, if the mounting piece 46 is to be fixed to the small-diameter projection 47a provided at the center of the terminal shaft similarly to the conventional example, the case in FIG. There is a disadvantage that the case cannot be accommodated within the width of the case due to the distance D in the direction of the outer wall, or that the case becomes large due to waste of space in the lateral direction. Accordingly, in order to efficiently store the protrusions in the space, the small-diameter protrusions need to be provided so as to be shifted (eccentric) from the center of the terminal shaft as shown in FIG. In this case, a pedestal portion 38 integral with the terminal shaft is required for eccentricity. However, since the projection 37 is eccentric, it is difficult to manufacture the entire structure by extrusion, so that the entire structure cannot be cut. I didn't get it.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a current-carrying switch using an electromagnetic relay structure instead of the conventional magnet switch, which can withstand a larger current capacity than the conventional one. It is an object of the present invention to realize a terminal structure which can be efficiently housed in a relay case in a structure using a flexible rod-shaped terminal shaft.
Another object of the present invention is to propose a terminal strip structure that can be manufactured by extrusion of a terminal shaft for achieving the above object.

[0007]

According to another aspect of the present invention, there is provided an energizing switch including a pair of input terminal portions and a pair of output terminal shafts, and applying a voltage between the pair of input terminal portions. In the energizing switch configured to generate a magnetic force in the electromagnetic coil to conduct between the pair of output terminal shafts, a part of the storage case is configured,
A pair of rod-shaped output terminal shafts, an insulating base through which the plate-shaped mounting piece is integrated at the tip, and a pair of rod-shaped output terminal shafts through which the rod-shaped portion penetrates the insulating base; a case inner end of the insulating base; A pair of bent plate-shaped output terminal pieces that are conductively connected to the output terminal shaft, fixed contacts conductively connected to the one output terminal piece, and the electromagnetic coil that is conductively connected to the other output terminal piece. A hinge-type movable piece having a movable contact that operates in response to a magnetic field generated by opening and closing the contacts based on the operation of the movable piece to conduct between the pair of output terminal shafts. It is characterized by. Further, a contact plate-shaped portion having a shape corresponding to the plate-shaped mounting piece at the tip of the output terminal shaft is provided at one end of the pair of bent plate-shaped output terminal pieces, and A small-diameter projection is provided on the plate-shaped mounting piece, and the projection is fitted and fixed to a shaft hole of the contact plate-shaped portion of the output terminal piece. Further, the other output terminal piece on the movable contact side is attached to the plate-like tip of the output terminal shaft by providing the bent portion at the inner side end of the case of the insulating base toward the center of the case. Features.

According to this means, the inner end of the rod-shaped output terminal shaft through which the insulating base is inserted and the output terminal piece conductively connected to the contact block of the electromagnetic relay section are connected via the plate-shaped mounting piece. Conductive connection, it is possible to increase the current capacity of the output terminal shaft connected to an external wiring or a socket, and to prevent deformation of the insulating base due to overheating of the output terminal shaft and burning of the conductive connection portion. . Still further, an end of the output terminal piece is formed at a tip of a bent portion,
A contact plate-shaped portion having a surface corresponding to the surface of the inner end of the insulating base of the output terminal shaft is provided, and the surface of the contact plate-shaped portion comes into contact with the inner end of the insulating base of the output terminal shaft. It is conductively connected in a state where it is connected. According to this means, the joining area between the output terminal piece and the output terminal shaft can be made large, and overheating and burning of this joining portion can be prevented.

In this case, the output terminal strip on the movable contact side further includes a bent portion on the inner side end of the insulating base of the output terminal shaft on the center side of the case. According to this means, since the bent portion of the output terminal piece is provided with a bent portion on the center side of the case, the small-diameter projection at the tip integrated with the output terminal shaft is formed on the rod-shaped portion of the output terminal shaft. Since it is possible to bring the output terminal shaft to the center, the plate-shaped mounting piece of the output terminal shaft can be matched with the contact plate-shaped portion of the output terminal piece without increasing the width of the insulating case. Can be manufactured by extrusion molding. Note that the output terminal piece is preferably formed of the same material as the output terminal shaft in terms of joining characteristics.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a power supply switch according to the present invention; This embodiment shows an example configured so as to be adapted to be used as an energizing switch of a starter for an internal combustion engine. FIG. 1 is a schematic perspective view showing the entire structure of an embodiment of a current-carrying switch of the present invention with a metal case 20 (shown by a dashed line) removed, and FIG. 2 is a hinged electromagnetic type shown in FIG. FIG. 3 is an exploded perspective view of a portion excluding the relay unit 30, FIG.
3A is a rear view showing the outer surface of the insulating base 10 in FIG. 2, and FIG. 3B is a detailed view showing the inner surface of the insulating base 10 in FIG. In this embodiment, a pair of output terminal shafts 11 made of a good conductor such as a copper alloy are connected to a pair of shaft insertion holes 10a from the inside of the case with respect to the insulating base 10.
After that, the output terminal pieces 12 and 13 shown in FIG. 2 are fitted to the case inner end 11 a of the output terminal shaft 11, and the electromagnetic relay section 30 shown in FIG. It is configured. The output terminal strip 12,
Reference numeral 13 is formed of the same good conductor as the output terminal shaft 11 such as a copper alloy.

As shown in FIG. 2, the insulating base 10 is made of a synthetic resin on a rectangular plate, and has a shaft insertion hole 10a through which the output terminal shaft 11 is inserted, and a pair of holes through which input terminal pieces, which will be described later, are inserted and drawn out. And a pair of rectangular holes 10c for inserting an extension into a pair provided in a yoke of the electromagnetic relay unit 30 described later, and configured to fit inside the metal case. A metal contact holding plate 14 is press-fitted and fixed at a position directly below the upper part of the fitting flange 10j (FIG. 2) on the frame. The insulating base is usually made of polyethylene terephthalate resin, and the contact holding plate 14 is an upper stopper when the contacts are opened. Immediately below the press-fit fixing portion of the contact holding plate 14,
A horizontally long slit hole shown at 10 m in FIG. 3B is formed, and a press-fit portion 13 c of the output terminal piece 13 described later.
(FIG. 2) is press-fitted and fixed. On the back surface of the insulating base 10, as shown in FIGS.
d is provided, and the insertion hole 1 is provided on the surface of the thick portion 10d.
An opening on the back side of Oa is formed. The opening edge 10i of the shaft insertion hole 10a in the thick portion 10d is formed in a conical surface as shown in FIG. A triangular prism-shaped eave portion 10e (FIGS. 1 and 3) is provided on the upper portion of the back surface of the insulating base 10 so as to block between the pair of output terminals 11.
e, a partition 10 on the plate extending further to the rear side and downward.
f (FIGS. 1 and 3) are also formed. A pair of concave portions 10g (FIG. 3) are formed under the thick portion 10d, and the slit holes 10g are respectively formed in the concave portions 10g.
b and the rectangular hole 10c (FIGS. 2 and 3) are open. Further, a circular circular concave portion 10h is further provided on the inner side of the slit hole 10b in the concave portion 10g.

In FIG. 3B, the dotted lines form the same plane, and 10i, 10k, and 10l are recesses with respect to the plane. 10l is 12f, 13f of the terminal piece.
A portion (FIG. 2) is a recess to be fitted, and 10a is a terminal shaft insertion opening. 10i is provided for the support structure of the contact holding plate 14. All of the above structures are integrally formed by injection molding or the like.

The output terminal shaft 11 is formed in a round bar shape, and the case inner end 11a is formed in a plate shape having a plate surface orthogonal to the axial direction, and the surface is flat.
The center of the surface of the inner end 11a of the output terminal shaft 11 is shown in FIG.
As shown in the figure, a protruding shaft portion 11b formed in a small diameter shaft shape is provided. Shaft insertion hole 10 in output terminal shaft 11
The portion inserted into the inside a has a cylindrical outer peripheral portion, but as shown in FIG. 4, a male screw 11c is engraved on the outside of the portion inserted through the shaft insertion hole 10a. . An O-ring 15 for waterproofing and a flat washer 16 for pressing the O-ring shown in FIG. 4 are inserted through the male screw 11c, and a spring washer (spring washer) 17 shown in FIG.
Are inserted, the nuts 18 and 19 are screwed in and tightened.

As shown in FIG. 2, the output terminal strip 12 includes a yoke mounting portion 12a having a caulking hole 12b, a band-shaped flat band portion 12c extending from the yoke mounting portion 12a, and a flat band portion 12c. On the other hand, the inclined plate portion 12d which is bent by about 30 degrees and extends in the oblique direction inward, is again inclined with respect to the inclined plate portion 12d, becomes parallel to the flat band portion 12c again, and is formed wide in the vertical direction from the middle. And a flat contact plate portion 12f which is bent at a right angle from the width change portion 12e and has a plate surface parallel to the surface of the inner end 11a of the output terminal shaft 11. At approximately the center of the contact plate portion 12f, a shaft hole 12g through which the center protruding shaft portion 11b of the inner end portion 11a can be inserted is formed.

On the other hand, in the output terminal strip 13, a fixed contact 13b is fixed on the surface of a facing portion 13a arranged horizontally, and the back side of the fixed contact 13b becomes a press-fit portion 13c and is formed on the insulating base 10. Into a slit hole (not shown). The insulating base side of the connecting portion 13d extending horizontally from the facing portion 13a is bent at substantially a right angle to form a vertical flat plate-like contact plate portion 13e.
“e” comes into contact with the inner end 11 a of the output terminal shaft 11. A shaft hole 13f for receiving the protruding shaft portion 11b is formed at the center of the contact plate portion 13e. To facilitate understanding, in FIG. 1, 31 is a coil spool made of synthetic resin, 14 is a metal contact holding plate, 30 and 34 are yokes and movable pieces of the same material, and 33 is phosphor bronze. It is a spring. In FIG. 1, the portion denoted by reference numeral 31 is a single member that is all integrated.

In the electromagnetic relay section 30, as shown in FIG. 1, an iron core (not shown) is inserted through a center hole of a coil spool 31 made of synthetic resin, and a yoke 32 having an L-shaped cross section is connected to the lower coil spool 31. It is joined to the iron core at the lower part. A lower part 37 of an L-shaped movable contact spring 33 made of a thin plate such as thin phosphor bronze is fixed to the upper end of the yoke 32. An upper end portion 38 of the movable contact spring 33 is disposed above the coil spool 31. A movable piece 34, which is made of the same material and is separate from the yoke 32, is fixed and extends as it is. The movable contact is arranged below the contact holding plate 14. An electromagnetic coil 35 is wound around the outer peripheral surface of the cylindrical portion of the coil spool 31. Both ends of the conductive wire drawn from the electromagnetic coil 35 are connected to a pair of input terminal pieces 36 pressed into the side of the coil spool 31. (Only one is shown). The pair of input terminal pieces 36 are press-fitted into the pair of slit holes 10b of the insulating base 10, respectively, and protrude into recesses 10g provided on the back side of the insulating base 10 shown in FIG. A pair of mutually symmetrical convex portions 31a (FIG. 1) are provided on the upper portion of the coil spool 31, and the peripheral portions of the contact holding plate 14 are formed in the concave groove portions 31b formed in these convex portions 31a. Projection 14 provided on
a is fitted. An insulating base 10 is provided below the yoke 32 attached to the coil spool 31.
A pair of extensions (not shown) is provided at the side end,
These extensions are inserted into rectangular holes 10c provided in the lower portion of the insulating base 10 and shown in FIGS.

In this embodiment, the protruding shaft portion 1 is arranged such that the contact plate portions 12f and 13e of the output terminal pieces 12 and 13 shown in FIG.
In a state where 1b is inserted through the shaft holes 12g and 13f, the electromagnetic relay unit 30 is mounted on the insulating base 10 as shown in FIG. At this time, the yoke mounting portion 12 of the output terminal strip 12
The projection 32a (FIG. 1) provided on the side of the yoke 32 is inserted into the caulking hole 12b formed in the projection 3a.
The output terminal piece 12 is fixed to the yoke 32 by caulking the protruding portion of the terminal 2a through which it is inserted. The protruding shaft portion 11b inserted into the shaft holes 12g and 13f of the output terminal pieces 12 and 13 is also formed by caulking.
Thus, the output terminal shaft 11 and the output terminal pieces 12 and 13 are fixedly connected to each other.

When the electromagnetic relay section 30 is mounted on the insulating base 10, the pair of input terminal pieces 36
b and protrudes into a concave portion 10g provided on the back surface of the insulating base 10, and a pair of extended portions of the yoke 32 are inserted through the rectangular holes 10c into the concave portions 10g provided on the back surface of the insulating base 10. Protrude. The electromagnetic relay portion 30 is fixed to the insulating base 10 by the portion of the extension of the yoke 32 protruding from the rear surface of the insulating base 10 projecting into the concave portion 10g being subjected to caulking in the concave portion 10g. It should be noted that the input terminal strip 36 protruding into the recess 10g on the back side of the insulating base 10 through the slit hole 10b.
Is connected to the input end. In this state, the outer end is bent toward the adjacent circular concave portion 10h, and then the resin is poured into the concave portion 10g and sealed.

In this embodiment, when a voltage of a predetermined value or more is applied between the outer end portions of the pair of input terminal pieces 36 projecting to the back side of the insulating base 10, a current flows through the electromagnetic coil 35 to be excited, The movable piece 34 is attracted to the magnetic pole formed at the upper end of the iron core (not shown), and the movable contact (not shown) provided at the tip of the movable contact spring 33 moves downward, and contacts the fixed contact 13 b of the output terminal piece 13. I do. Thereby, the output terminal piece 12, the yoke 32,
A conductive path to the movable contact spring 33, the movable contact, the fixed contact 13b, the output terminal strip 13, and the other output terminal shaft 11 is formed.

In this embodiment, first, the output terminal shaft 11 having a sufficient sectional area capable of withstanding a high current is connected to the insulating base 10.
And an output terminal piece connected to the electromagnetic relay unit 30 with respect to the inner end of the case of the output terminal shaft (the end located on the front side of the insulating base 10 and inside the metal case 20). Since the conductive connections 12 and 13 are electrically connected, the insulating base is overheated during the normal operation at the insertion portion of the insulating base and the junction between the wiring base and the external wiring cord or socket, and the insulating base is deformed.
It is possible to prevent the joint from burning out.
Further, in this embodiment, as shown in FIG. 4, both of the output terminal pieces 12 and 13 are provided in parallel with the surface of the case inner end 11a of the output terminal shaft 11 via a bent portion. Contact plates 12f and 13e are provided, and the surfaces of these contact plates 12f and 13e are
Since the conduction is ensured in the state of being in contact with the a, the junction area of the conductive contact portion between the output terminal shaft and the output terminal piece can be increased, and the junction can be performed even when a large current flows during normal operation. It is possible to prevent overheating and burning of the part.

[0021]

As described above, according to the present invention, the inner end of the case of the output terminal shaft through which the insulating base is inserted and the output terminal piece conductively connected to the contact block of the electromagnetic relay section are conductively connected. By doing so, the current capacity of the output terminal shaft connected to external wiring and sockets, etc. is increased to prevent deformation of the insulating base due to overheating of the output terminal shaft during normal operation and burning of the conductive connection part. it can. In particular, the surface of the contact plate-shaped portion formed at the tip of the bent portion of the output terminal piece can be configured to abut against the surface of the inner end portion of the output terminal shaft. The joint area can be increased, and overheating and burning of the joint can be prevented.

Further, as shown in FIG. 2, by using an output terminal piece bent toward the center of the case by an inclined plate portion 12d with respect to a yoke mounting portion 12a, a small-diameter projection 11b of the terminal shaft is used. Even if it is brought to the center, it can be accommodated in the width of the case (inside of 10j), so that the terminal shaft can be manufactured by extrusion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a metal case is removed in an embodiment of an energizing switch according to the present invention.

FIG. 2 is an exploded perspective view of a portion of the embodiment from which an electromagnetic operation unit is removed.

FIG. 3 is a rear view (a) and a front view (b) showing a rear portion of the insulating base in the embodiment shown in FIG. 2;

FIGS. 4A and 4B are enlarged longitudinal sectional views (a) and (b) showing enlarged connection portions (two places) between a pair of output terminal shafts and a pair of output terminal pieces in the embodiment.

FIG. 5 is a diagram showing a terminal structure of a conventional energizing switch.

FIG. 6 is a detailed view of a terminal structure of the conventional energizing switch.

FIG. 7 is a detailed view of another improved terminal structure of the conventional energizing switch.

FIG. 8 is a detailed view of a terminal structure of the current-carrying switch of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulation base 10a Shaft insertion hole 11 Output terminal shaft 11a Inner end part 11b Projection shaft part 12, 13 Output terminal piece 12f, 13e Contact plate part 12g, 13f Shaft hole 30 Electromagnetic operation part 31 Coil spool 32 Yoke 33 Movable contact spring 34 Movable piece 35 Electromagnetic coil 36 Input terminal piece 37 Projection 38 Pedestal 40 Terminal piece

Claims (4)

[Claims] A pair of input terminal portions and a pair of output terminal shafts, wherein a voltage is applied between the pair of input terminal portions to generate a magnetic force in an electromagnetic coil, thereby causing a gap between the pair of output terminal shafts. In a current-carrying switch configured to be conductive, a part of a storage case is formed, an insulating base through which a pair of rod-shaped output terminal shafts are inserted, and a plate-shaped mounting piece integrated at a tip, and the rod-shaped part is A pair of rod-shaped output terminal shafts through which the insulating base is inserted, a pair of bent plate-shaped output terminal pieces that are conductively connected to the output terminal shafts at the inner end of the case of the insulating base, and a conductive member connected to the one output terminal piece; A hinge-shaped movable piece having a movable contact that is conductively connected to the connected fixed contact and the other output terminal piece and that operates in response to a magnetic field generated by the electromagnetic coil, based on the operation of the movable piece; There energization switch for causing conduction between the pair of output terminals shaft by opening and closing between the contacts. 2. A contact plate-like portion having a shape corresponding to a plate-like mounting piece at the tip of said output terminal shaft is provided at one end of said pair of bent plate-like output terminal pieces. The energizing switch according to claim 1. 3. A small-diameter projection is provided on a plate-shaped mounting piece at the tip of the output terminal shaft, and the projection is fitted and fixed in a shaft hole of a contact plate-shaped portion of the output terminal piece. The current-carrying switch according to claim 2, wherein: 4. The other output terminal piece on the side of the movable contact is provided with the bent portion at the inner end of the case of the insulating base toward the center side of the case and attached to the plate-like tip of the output terminal shaft. The claim 1 characterized in that
3. The energizing switch according to any one of 3.