JP2008016215A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay for a printed board of a compact size with equivalent function and yet with a high heat radiation property, and capable of passing a large-load current under a high-temperature environment. <P>SOLUTION: In the electromagnetic relay 1 fixing a movable contact spring 11 to a yoke 8 of an electromagnetic block, a load current channel inside is formed in a T-shape or a cross shape, and an outside fixed terminal part 12a is arranged at a position in line symmetry with a core axis as a center, whereby, a conductive resistance of the load current channel is made small to improve a balance of heat distribution. As a result, heat radiation inside at conduction of a load current is lessened and the heat inside can be efficiently transmitted outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a small electromagnetic relay mounted on a substrate or the like, and more particularly, to an electromagnetic relay effective for use in an in-vehicle electrical component.

  In recent years, modularization of automobile parts has progressed, and electromagnetic relays that are distributed and mounted in a vehicle are concentrated in a junction box in an engine room, so that the demand for electromagnetic relays that can be used in a high-temperature environment is increasing. Further, in order to cope with the downsizing of the board to be mounted, it is necessary to replace the plug-in type electromagnetic relay with an electromagnetic relay for a printed circuit board. Therefore, there is an increasing demand for electromagnetic relays for printed circuit boards that can be used in a high temperature environment such as an engine room.

  As a conventional electromagnetic relay for printed circuit boards, for example, there is an electromagnetic relay disclosed in Patent Document 1. The electromagnetic relay includes a coil (winding), a core (iron core), a yoke (yoke), an armature (movable iron piece) that swings by a magnetic attractive force, and a movable contact spring that applies a restoring force to the armature. A movable contact connected to the armature, a normally open fixed contact or a normally closed fixed contact disposed opposite to the movable contact, an external fixed terminal portion led to the outside through the normally open fixed contact, An external fixed terminal portion that is conducted to the normally closed fixed contact and led to the outside, and an external fixed terminal portion that is part of the common terminal plate (common terminal plate) that is conducted to the movable contact and led to the outside It is prepared for. The movable contact opens and closes with respect to the normally open fixed contact or the normally closed fixed contact by a magnetic attractive force and a restoring force of the movable contact spring, and is an external fixed terminal that is a part of a common terminal plate (common terminal plate) The conduction state of the part and the normally open fixed contact or the normally closed fixed contact is switched.

  In this type of conventional electromagnetic relay, a normally open fixed contact terminal, a normally closed fixed contact terminal, and a common terminal plate are arranged in a straight line in the core axis direction, and the load current flow in the electromagnetic relay is as shown in FIG. Since 21 was on a straight line, there was a disadvantage that a non-uniform state occurred in the temperature distribution inside the electromagnetic relay. Further, in the case of an electromagnetic relay for energizing a large load current, the size of the entire electromagnetic relay must be increased to increase the energization capacity. However, when the electromagnetic relay is increased in size, there is a problem that a printed board on which the electromagnetic relay is mounted becomes larger.

JP 2000-260284 A

  As described above, there is a demand for a small printed circuit board electromagnetic relay capable of energizing a large load current of about 30 A to 40 A in a high temperature environment of 85 ° C. to 135 ° C. as in an engine room. When trying to make it, deterioration of the insulating film of the coil became a problem due to the temperature rise of the coil. For example, when a conventional electromagnetic relay having the same function is proportionally reduced, the amount of heat generated in the electromagnetic relay increases due to an increase in coil power consumption or an increase in load current density flowing through the movable contact spring. Further, as the electromagnetic relay is reduced in size, the wiring pattern width on the printed board is narrowed, and the amount of heat released from the heat generated inside the electromagnetic relay to the outside (conductive member such as a wiring pattern on the printed board) is reduced. As a result, the temperature inside the electromagnetic relay rises, the insulating film of the coil, which is the most thermally weak part, deteriorates, and eventually the electromagnetic relay fails and becomes a problem. Hereinafter, this problem will be described in more detail.

  The main heat generation points of the electromagnetic relay are a coil, a contact, and a movable contact spring. Heat generated in the coil by energizing the coil is transmitted to the core mainly through the spool, and only a small part is diffused from the surface of the coil to the atmosphere inside the electromagnetic relay. The heat transmitted from the outer peripheral surface to the core is transmitted to the outside (conductive member such as a wiring pattern on the printed circuit board) via the yoke, or further externally (printed) via the common terminal board via the yoke. Is transmitted to a conductive member such as a wiring pattern on a substrate) or from a fixed terminal to the outside (conductive member such as a wiring pattern on a printed circuit board) via a yoke, a movable contact fixed to a movable contact spring, or a fixed contact. Is transmitted to.

  However, in the diffusion of coil heat generation through the common terminal plate described above, since the load current path of the electromagnetic relay is configured, it further occurs at the contact portion between the movable contact and the fixed contact due to the electrical resistance of the common terminal plate. There was a problem that the temperature of the fixed terminal itself increased due to heat generation and the heat dissipation performance inside the electromagnetic relay was poor.

  In addition, when a large load current is applied to a small electromagnetic relay, the heat generated at the contact portion between the movable contact and the fixed contact is much larger than the coil heat generation, so that the heat generated at the contact portion between the movable contact and the fixed contact is generated. There is a problem that the insulating film of the coil which is transmitted to the coil through the yoke and is the most thermally weak part deteriorates and eventually the electromagnetic relay breaks down. In addition, as described above, conventionally, the normally open fixed contact terminal, the normally closed fixed contact terminal, and the common terminal plate are configured in a straight line in the core axis direction, and thus heat distribution is not uniform in the electromagnetic relay. There was a drawback. This drawback has a problem that the efficiency for diffusing the heat in the electromagnetic relay to the outside deteriorates.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay for a printed circuit board that is small in size and has the same function but has high heat dissipation and can pass a large load current in a high temperature environment.

  The present invention is an electromagnetic relay comprising an electromagnetic relay main body constituted by an electromagnetic block and a base block, and a cover for housing the electromagnetic relay main body, wherein the electromagnetic block includes a spool around which a coil is wound, A core inserted into the core through-hole of the spool, a yoke having a core through-hole for connecting the cores, and the tip is rocked by being attracted to the tip of the core when the coil is energized. It is composed of a plate-shaped member in which an armature, a common terminal plate and a movable contact spring provided with a movable contact are integrated, and the base block is composed of a base, a normally open fixed contact terminal and a normally closed fixed contact terminal, The plate-like member is fixed to the yoke, and the external fixed terminal portion of the common terminal plate is arranged at a line-symmetrical position with respect to the center of the core axis. Current path characterized in that it is shaped in T-shape.

  According to the present invention, in the electromagnetic relay described above, the shape of a plate-like member in which a common terminal plate having an external fixed terminal portion and a movable contact spring having a hinge portion and a tip swinging is integrally formed is a T-shape. It is characterized by being.

  The present invention is characterized in that, in the above-described electromagnetic relay, a load current path inside the electromagnetic relay is formed in a T-shape by a part of a U-shaped common terminal plate and an I-shaped movable contact spring. .

  The present invention is characterized in that, in the above-described electromagnetic relay, a positioning protrusion for accurately positioning an external fixed terminal constituting a part of the common terminal plate on the base is provided on the base.

  In the electromagnetic relay described above, the common terminal plate has a plate-like portion that covers the side surface of the coil, and the plate width is wider than the plate width of the movable contact spring.

  The present invention is characterized in that in the above-described electromagnetic relay, one end of the yoke is led out of the electromagnetic relay as an external fixed terminal, thereby forming a load current path inside the electromagnetic relay in a cross shape.

  According to the electromagnetic relay of claim 1, the load current path inside the electromagnetic relay is formed in a T shape, and has a plurality of external fixed terminal portions constituting a part of the common terminal plate, Since there are two external fixed ends each constituting a part of the common terminal plate at a line-symmetrical position about the core axis, the heat distribution in the electromagnetic relay is almost uniform and the common It is possible to efficiently diffuse the heat inside the electromagnetic relay from the terminal board to the outside (conductive member such as a pattern on the printed board). Therefore, even if a large load current is applied to an electromagnetic relay, the temperature rise is small, and the size is small and the function is equivalent, but the heat dissipation is high. It is possible to provide an electromagnetic relay.

  According to the electromagnetic relay according to claim 2, since the common terminal plate and the movable contact spring are connected and integrally formed in a T shape, the conductor resistance between the common terminal plate and the movable contact spring is small, and extremely heat is generated. It is possible to realize an electromagnetic relay with less.

  According to the electromagnetic relay of the third aspect, since the common terminal plate and the movable contact spring are separately formed, the member usage rate is improved and the simplicity in manufacturing is improved.

  According to the electromagnetic relay of the fourth aspect, the ease of positioning of the external fixed terminal portion is improved by fitting the external fixed terminal portion of the common terminal plate to the movable contact spring receiving portion on the base.

  According to the electromagnetic relay of claim 5, when the case is fitted into the electromagnetic relay main body, the surface of the coil is scratched by installing the plate-like portions for covering the coil side surfaces of the common terminal plate on both surfaces of the coil. It can be expected to prevent lighting. Further, since the plate width of the plate-like portion is wider than the plate width of the movable contact spring, it is possible to increase the time constant of the temperature rise of the electromagnetic relay, and the load current energizing time is short so as not to reach the saturation temperature. A reduction in the final temperature of the electromagnetic relay can be expected with respect to the condition of time energization.

  According to the electromagnetic relay of the sixth aspect, since one end of the yoke is further led out as an external fixed terminal portion outside the electromagnetic relay, the load current path inside the electromagnetic relay is configured in a cross shape so that the electromagnetic relay The balance of heat distribution inside the relay is improved.

  Hereinafter, a first embodiment, a second embodiment, and a third embodiment, which are embodiments of the present invention, will be described with reference to the drawings.

  FIG. 1 is a perspective view of the electromagnetic relay according to the first embodiment of the present invention. FIG. 1A is a perspective view seen from above, and FIG. 1B is a perspective view seen from below. 2A and 2B are explanatory views of the electromagnetic relay main body according to the first embodiment of the present invention. FIG. 2A is a perspective view, FIG. 2B is a plan view, and FIG. It is AA sectional drawing of FIG.2 (b). FIG. 3 is an exploded view of the electromagnetic relay according to the first embodiment of this invention. FIG. 3A is an exploded perspective view, and FIG. 3B is a plan view of the base block. FIG. 4 is an exploded perspective view of the electromagnetic block according to the first embodiment of the present invention. FIG. 5 is a diagram showing an example of a pattern layout of a printed board on which the electromagnetic relay according to the first embodiment of the present invention is mounted.

  As shown in FIGS. 1 to 3, the electromagnetic relay 1 includes an electromagnetic relay main body 2 constituted by an electromagnetic block 4 and a base block 5, and a case 3 for housing the electromagnetic relay main body 2.

  3 and 4, the electromagnetic block 4 includes a spool block 6, a core 7 inserted into the core through hole 18b of the spool block 6, four common terminal plate fixing protrusions 8c, and a base press-fitting portion. A through-hole 8g for the core is formed in the press-fitting jig abutting portion 8d for pressing the jig for press-fitting 8f into the yoke fitting hole 17a, the press-fitting amount positioning portion 8e for receiving the press-fitting receiving portion 17e of the yoke, and the yoke fixing projection 7a. An L-shaped yoke 8 that is connected to form a magnetic circuit, and an armature in which one end 9a is joined to the tip 8a of the yoke 8 and the tip 9b swings by being attracted to the tip 7b of the core 7 when the coil is energized. 9, a plate spring in which a movable contact spring 11 that is a swingable plate spring and a common terminal plate 12 having a plate-like portion 12 c are integrally formed, and for fixing the movable contact of the movable contact spring 11 Constituted by the movable contact 10 fixed to the through hole 11a.

  Further, the common terminal board 12 has four external fixed terminal portions 12a for connection to the printed board, and the external fixed terminal portion 12a is double-molded to be folded twice in order to reduce the conductor resistance. ing. Further, the movable contact spring fixing projection 9c of the armature 9 and the armature fixing through hole 11b of the movable contact spring are fixed by caulking. Further, the yoke fixing through hole 11d and the movable contact spring fixing protrusion 8b are caulked and fixed, and the yoke fixing through hole 12b and the common terminal plate fixing protrusion 8c are caulked and fixed.

  The base block 5 includes a normally open fixed contact 13 to which the movable contact 10 is pressed when the coil is energized, a normally open fixed contact terminal 15 to which the normally open fixed contact 13 is fixed, and a normally closed to which the movable contact 10 is pressed when the coil is not energized. Fixed contact 14, normally closed fixed contact terminal 16 to which normally closed fixed contact 14 is fixed, yoke fitting hole 17a, two coil terminal through-holes 17b, and two common terminal plate external fixed terminal introducing ribs 17c And a base 17 having two common terminal plate through holes 17d.

  The spool block 6 includes a coil 20, a spool 18 having two coil terminal fitting holes 18c on both side surfaces of the core through hole 18b and the flange 18a, for winding the coil 20, and for connecting to the printed board. The external fixed terminal portion 19a and two coil terminals 19 each having a coil wrapping connection portion 19b for wrapping and soldering a coil wire.

  Moreover, in order to ensure flexibility, the movable contact spring 11 usually has a plate thickness of 0.1 to 0.2 mm and a large conductor resistance in the electromagnetic relay that is the subject of this specification. In the electromagnetic relay of the first embodiment, since the common terminal plate 12 and the movable contact spring 11 are integrally formed, the thickness of the common terminal plate 12 is the same as that of the movable contact spring 11, and the conductor resistance is large. . Therefore, the external fixed terminal portion 12a having a narrow plate width of the common terminal plate 12 is folded twice to reduce the conductor resistance.

  The above structure is a so-called 1c type electromagnetic relay having a normally open contact (NO contact) and a normally closed contact (NC contact). Incidentally, the normally closed fixed contact terminal 16 can be used as a displacement regulating member for the movable contact 10 and the movable contact spring 11 without having the normally closed fixed contact 14, and in this case, the normally open contact ( This is a so-called 1a type electromagnetic relay having only NO contacts. Both types of this structure can be easily manufactured. Hereinafter, the description of the type 1c type will be continued.

  As shown in FIG. 2, there are three external fixed terminal portions 15a of normally-open fixed contact terminals 15 and normally-closed terminals as electromagnetic relay connection terminals for electrical connection to conductors such as printed circuit board wiring. The external fixed terminal portion 16a of the fixed contact terminal 16, the four external fixed terminal portions 12a of the common terminal plate 12, and the external fixed terminal portions 19a of the two coil terminals 19 extend from the base 17 to the outside of the electromagnetic relay. Yes.

  Further, in order to reduce the conductor resistance and efficiently release the heat inside the electromagnetic relay to the outside of the electromagnetic relay, the normally open fixed contact terminal 15 has three external fixed terminal portions 15a and the common terminal plate 12 has four. It has an external fixed terminal portion 12a. An external fixed terminal portion constituting a part of the common terminal plate 12, an external fixed end portion constituting a part of the normally open fixed contact terminal 15, and an external fixed terminal portion constituting a part of the normally closed fixed contact terminal 16 The amount of heat that diffuses the heat inside the electromagnetic relay to the outside increases, and is more preferable.

  Moreover, the terminal layout of this structure is easy in the pattern layout of a printed board, as shown in FIG. In addition, it is possible to easily make a surface mount terminal by bending each terminal in the outer direction of the electromagnetic relay.

  Further, as shown by the load current flow 21 in FIG. 2A, the load current flow in the electromagnetic relay flows in a T-shape through the electromagnetic relay to the movable contact spring 11 and the common terminal plate 12. As shown in FIG. 11 showing an example of a conventional electromagnetic relay main body, the heat distribution is superior to the case of an I-shaped load current flow 21 flowing to the movable contact spring 11 and the yoke 8, and the heat distribution inside the electromagnetic relay. The balance is good.

  Further, as shown in FIG. 4, since the common terminal plate 12 has a plate-like portion 12c having a large area, the time constant of the temperature rise of the electromagnetic relay can be increased when energizing the load current, and the conductor resistance is reduced. It is possible to reduce heat generation. Moreover, as shown in FIG.3 and FIG.4, the effect which prevents the surface of the coil 20 from being damaged when the electromagnetic relay main body 2 is accommodated in the case 3 can be expected.

  Next, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a perspective view of the electromagnetic relay main body 2 according to the second embodiment of the present invention. The difference between the first embodiment and the second embodiment of the present invention is only the difference between whether the movable contact spring 11 and the common terminal plate 12 are integrally formed or not. Omitted.

  In the electromagnetic relay according to the second embodiment of the present invention, the movable contact spring 11 and the common terminal plate 12 are separately formed, so that the number of parts is larger than that in the case where the movable contact spring 11 and the common terminal plate 12 are integrally formed. Become more. In addition, since the caulking fixing portion having a large contact resistance is interposed in the load current path between the movable contact spring 11 and the common terminal plate 12, heat is generated near the caulking fixing portion. Therefore, the conductor resistance of the common terminal plate 12 is reduced by making the plate thickness of the common terminal plate 12 larger than the plate thickness of the movable contact spring 11. Moreover, since the common terminal board 12 is thick, it is not necessary to be folded twice.

  Next, an example of the third embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a perspective view of the electromagnetic relay 1 according to the third embodiment of the present invention as viewed from below. FIG. 8 is a perspective view of the electromagnetic relay main body 2 according to the third embodiment of the present invention. FIG. 9 is an exploded perspective view of the electromagnetic block 4 according to the third embodiment of the present invention. FIG. 10 is a diagram showing an example of a pattern layout of a printed board on which the electromagnetic relay 1 according to the third embodiment of the present invention is mounted.

  The difference between the second embodiment and the third embodiment of the present invention is whether or not the yoke 8 has an external fixed terminal portion 8h, as shown in FIGS. By providing the external fixed terminal portion 8h, the load current path inside the electromagnetic relay has a cross shape as shown by the load current flow 21 in FIG. Therefore, as compared with the second embodiment, the balance of the heat distribution inside the electromagnetic relay is further improved, and the heat generation inside the electromagnetic relay can be expected to be reduced by dispersing the load current path. The pattern layout of the printed board according to the third embodiment is also easy as shown in FIG.

The perspective view of the electromagnetic relay of the 1st Embodiment of this invention. FIG. 1A is a perspective view seen from above, and FIG. 1B is a perspective view seen from below. Explanatory drawing of the electromagnetic relay main body of the 1st Embodiment of this invention. 2A is a perspective view, and FIG. 2B is a plan view. FIG.2 (c) is AA sectional drawing of FIG.2 (b). The exploded view of the electromagnetic relay of the 1st Embodiment of this invention. 3A is an exploded perspective view, and FIG. 3B is a plan view of the base block. The disassembled perspective view of the electromagnetic block of the 1st Embodiment of this invention. The figure which shows an example of the pattern layout of the printed circuit board which mounted the electromagnetic relay of the 1st Embodiment of this invention. The perspective view of the electromagnetic relay of the 2nd Embodiment of this invention. The perspective view seen from the lower part of the electromagnetic relay of the 3rd Embodiment of this invention. The perspective view of the electromagnetic relay main body of the 3rd Embodiment of this invention. The disassembled perspective view of the electromagnetic block of the 3rd Embodiment of this invention. The figure which shows an example of the pattern layout of the printed circuit board which mounted the electromagnetic relay of the 3rd Embodiment of this invention. The perspective view of the electromagnetic relay main body of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Electromagnetic relay main body 3 Case 4 Electromagnetic block 5 Base block 6 Spool block 7 Core 7a Yoke fixing protrusion 7b Tip 8 Yoke 8a Tip 8b Movable contact spring fixing protrusion 8c Common terminal board fixing protrusion 8d For press fitting Jig abutting portion 8e Press-fitting amount positioning portion 8f Base press-fitting portion 8g Core through hole 8h External fixed terminal portion 9 Armature 9a One end 9b Tip side 9c Movable contact spring fixing projection 10 Movable contact 11 Movable contact spring 11a Movable contact fixed penetration Hole 11b Armature fixing through hole 11c Hinge portion 11d Yoke fixing through hole 12 Common terminal plate 12a External fixed terminal portion 12b Yoke fixing through hole 12c Plate-like portion 13 Normally open fixed contact 14 Normally closed fixed contact 15 Normally open fixed contact Terminal 15a External fixed terminal portion 16 Normally closed fixed contact terminal 16a External fixed Sub part 17 Base 17a Yoke fitting hole 17b Coil terminal through hole 17c Common terminal plate external fixed terminal introduction rib 17d Common terminal plate through hole 17e Yoke press fit receiving part 18 Spool 18a Flange 18b Core through hole 18c Coil Terminal fitting hole 19 Coil terminal 19a External fixed terminal portion 19b Coil wrapping connection portion 20 Coil 21 Flow of load current

Claims (6)

  An electromagnetic relay comprising an electromagnetic relay body composed of an electromagnetic block and a base block, and a cover for housing the electromagnetic relay body, wherein the electromagnetic block is for a spool around which a coil is wound, and for the core of the spool A core inserted into the through hole, a yoke having a core through hole for connecting the cores, an armature that is attracted to the tip of the core when the coil is energized, and the tip swings, and a common A terminal plate and a movable contact spring provided with a movable contact are configured by a plate-shaped member, and a base block is configured by a base, a normally open fixed contact terminal, and a normally closed fixed contact terminal. The member is fixed to the yoke, and an external fixed terminal portion of the common terminal plate is disposed at a position that is line-symmetric with respect to the center of the axis of the core. Electromagnetic relay characterized in that it is shaped in T-shape.   A plate-like member formed integrally with the common terminal plate having the external fixed terminal portion and the movable contact spring having a hinge portion and swinging at the tip is a T-shape. The electromagnetic relay according to claim 1.   2. The electromagnetic relay according to claim 1, wherein the load current path is formed in a T shape by a part of the U-shaped common terminal plate and the I-shaped movable contact spring.   4. The electromagnetic relay according to claim 2, further comprising: a positioning projection on the base for positioning an external fixed terminal constituting a part of the common terminal plate on the base.   4. The electromagnetic relay according to claim 2, wherein the common terminal plate has a plate-like portion covering a coil side surface, and the plate width is wider than the plate width of the movable contact spring.   4. The electromagnetic relay according to claim 2, wherein one end of the yoke is led out of the electromagnetic relay as an external fixed terminal to form the load current path inside the electromagnetic relay in a cross shape. 5. .

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