JPS649698B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed circuit board-mounted relay for input/output interface between an electronic logic circuit and a high-power circuit in an electronic control system.

High-voltage electromagnetic relays mounted on printed circuit boards are often used for input/output interfaces between electronic logic circuits and high-power circuits in electronic control systems. This is because the electrical input/output isolation required by electronic control systems can be easily achieved at low cost.

Conventionally, for this purpose, Fig. 1 A, B or Fig. 2 A,
An electromagnetic relay 1 having a structure as shown in B is generally used. In FIGS. 1A and 1B, the electromagnet device 2 is attracted to a fixed iron core 4 around which an electromagnetic coil 3 is wound, a yoke (not shown) that is integrally formed with the fixed iron core 4, and forms a magnetic circuit. The contact device 10 is equipped with a movable iron piece 6 that is attracted to the iron core 4, a return spring (not shown) that returns the movable iron piece 6 that is attracted to the iron core 4, and the like.
A movable contact plate 12 in which the free end of the movable iron piece 6 is driven via a drive piece 11, and this movable contact plate 12
and a fixed contact stand 15 having fixed contacts 14 corresponding to the movable contacts 13. This electromagnetic relay 1 is fixed to a base 81 made of an insulating material and covered with a cover 91 also made of an insulating material. The electromagnetic device 2 is connected to an external connection terminal 3a passing through the case 8 by a lead of the electromagnetic coil 3 and led out to the outside, and is energized to operate and open/close the contact device 10. The contact device 10 is connected to an external connection terminal 10a.

Components in FIGS. 2A and 2B that have the same functions as in FIGS. 1A and B are given the same reference numerals. Second
In Figures A and B, the electromagnet device 2 includes a fixed iron core 4 around which an electromagnetic coil 3 is wound, a yoke 5 that forms a magnetic circuit together with the fixed iron core 4, a movable iron piece 6 that is attracted to the fixed iron core 4, and a movable iron piece 6 that is attached to the iron core 4. Aspirated movable iron piece 6
The contact device 1 is equipped with a return spring 7 for returning the
0 is composed of a movable contact plate 12 fixed to a movable iron piece 6 and a fixed contact base 15 equipped with fixed contacts 14 corresponding to the movable contacts 13 of this movable contact plate 12, and the return spring 7 is connected to the movable contact plate 12. It is integrated with the plate 12. This electromagnetic relay 1 is fixed to a case 8 made of an insulating material and covered with a cover 9 also made of an insulating material. In the electromagnet device 2, the lead of the electromagnetic coil 3 is connected to an external connection terminal 3a passing through the case 8 and led out to the outside, and is energized and operated to open and close the contact device 10. The contact device 10 is connected to an external connection terminal 10a.

Among such conventional devices, the electromagnetic relay 1 shown in FIGS. 1A and 1B has an electromagnetic device 2 with a flat structure and a height H.
Since the width W is larger than that of the electromagnetic coil 3 and the movable contact plate 12 because it is overlapped with the contact device 10.
The area of the opposing part is wide and the distance between them is narrow. In addition, the electromagnetic relay 1 shown in FIGS. 2A and 2B is small and has a spring that serves as the return spring 7 and the movable contact plate 12 fixed to the yoke 5 and the movable iron piece 6 by caulking or the like in order to reduce the installation area. Since the yoke 5 and the movable iron piece 6 are configured to have the same potential as the contact device 10, the electromagnetic coil 3 is covered with the contact device 10, and the area of the opposing portion between them is wide and the interval is narrow. . In general, when conductive parts such as metals face each other, a capacitance is formed between them, and the size of the capacitance is proportional to the area of the facing parts and inversely proportional to the distance. The electromagnetic relays shown in A and B have a drawback in that the stray capacitance between the electromagnetic coil and the contact device is large. When such a relay is used for an input/output interface between an electronic logic circuit and a high-voltage circuit in an electronic control system, how is the capacitance between the electromagnetic coil and the contact device affected? I will explain.

FIG. 3 shows an interface simulation circuit with an electronic logic circuit of an electronic control system. In FIG. 3, the electronic logic circuit 16 causes the signal current to flow through the electromagnetic coil 3 of the electromagnetic relay 1 to open and close the contact device 10. The contact device 10 is connected to a high-voltage circuit 17. By the way, the electronic logic circuit 16 has a ground capacitance C _E , and the electromagnetic coil 3 and the contact device 10
There is a stray capacitance C _R between. C _A is a capacitance additionally connected between an electronic logic circuit 16 to be described later and the ground. Generally, switching surges such as lightning surges and circuit breakers occur in the power system on the high-power circuit 17 side. In addition, noise is generated in the control power supply circuit due to the opening and closing of electromagnetic coils such as auxiliary relays, electromagnetic switches, and breakers connected to the circuit. If these surge and noise voltages are V, then this voltage V
may enter the electronic logic circuit 16 through the electrostatic capacitance C _R between the contact device and the electromagnetic coil of the electromagnetic relay, causing malfunction or destruction of elements in the circuit. Surge voltage entering the electronic theoretical circuit 16
Since V _E is V _E = V・C _R / (C _R + C _E ), connecting capacitance C _A in parallel with capacitance C _E reduces this voltage V _E and allows electronic logic circuits to Failures that occur can be prevented. However, it must be said that adding such capacitance requires extra space and man-hours for printed circuit boards, which have become highly densely packaged in recent years.

Further, in electronic control systems, a large number of electromagnetic relays are often mounted on a printed board as shown in FIGS. 4A and 4B. In FIGS. 4A and 4B, a large number of electromagnetic relays 1 are mounted on a printed circuit board 18 in two rows, and these are controlled by an electronic logic circuit 16, and their contact devices are connected to the external circuit via high-voltage circuit connection terminals 17a. It is connected by a printed board 18 so as to be connected to the high-power circuit of. 16a is a connection terminal for connecting the electronic logic circuit 16 of the printed board 18 to the electronic logic circuit of another printed board. When a large number of electromagnetic relays are mounted on a printed circuit board in this way, the pattern from the electromagnetic coil terminal connected to the electronic logic circuit element and the pattern from the contact device terminal connected to the high-voltage circuit are mixed, and the pattern between the contact device and the electromagnetic coil is mixed. It is difficult to ensure separation between the patterns and to minimize the capacitance between the patterns, making it difficult to design patterns on printed boards.

The present invention eliminates the need for additional capacitors used only to prevent failures due to surges, facilitates component placement on printed circuit boards of electronic control systems, and aims to stabilize quality and reduce costs. It is an object of the present invention to provide an electromagnetic relay that has small stray capacitance between devices, is small, and is easy to arrange.

This purpose is to provide an electromagnetic relay in which a contact device and an electromagnetic device for operating the contact device are housed in a case, in which the case is formed as an elongated closed box consisting of a base part and a cover part;
The contact device is provided on one side of the box in the longitudinal direction,
Further, the electromagnet devices are housed in the other half, and the contact device has a contact plate having an opening/closing contact at its free end, with the longitudinal direction of the contact plate parallel to the longitudinal axis of the box body, and the free end of the contact device. The electromagnet device is attached to the one side of the base portion of the case with the part facing the center of the box, and the electromagnet device has an iron core around which an electromagnetic coil is wound and a movable iron piece that is attracted to and released from the iron core. attached to the other side of the base of the case, and insulated so that the free end of the movable iron piece or its extension operates the free end of the contact plate in a direction perpendicular to the longitudinal direction of the contact plate; The external terminals of the electromagnetic coil of the electromagnetic device and the contact plate of the contact device are connected to the free end of the contact plate via a drive piece made of a member, and each external terminal of the electromagnetic coil of the electromagnetic device and the contact plate of the contact device are connected to each other on opposite sides with respect to the longitudinal direction of the case. This is accomplished by configuring it to protrude through the base at a location. In carrying out the present invention, the fixed core structure of the electromagnet device is formed as a U-shaped core with electromagnetic coils arranged around it and yokes at both ends of the fixed core parallel to the longitudinal direction of the box. and the movable iron piece of the electromagnet device is arranged so as to bridge the end surfaces of both yokes of the U-shaped iron core, and is rotatably supported by the yoke on the opposite side of the contact device. , or a rod-shaped fixed core around which an electromagnetic coil is arranged and arranged parallel to the box body and the longitudinal axis, and one leg is connected to the end face of the base of the fixed core, and the other leg is parallel to the fixed core. The movable iron piece of the electromagnet device is configured in an L-shape, and the yoke is configured such that one leg of the L-shape can come into contact with and separate from the end face of the tip of the fixed iron core. The electromagnet device is rotatably supported on the other leg, and the electromagnet device is attached to the base portion such that the other leg of the yoke is on the side opposite to the base portion of the fixed iron core, and the electromagnet device is attached to the base portion of the fixed iron core. It is preferable that the other leg of the L-shape opens and closes the contact device, and one leg of the movable iron piece of the electromagnet device is arranged so as to be on the contact device side of the electromagnet device, or the contact device of the electromagnet device It is placed so that it is on the opposite side. The contact device consists of an insulating block, a movable contact plate and a fixed contact block each having a switching contact at its free end, the insulating block being attached to the base of the case, and the fixed contact block being attached to the insulating block. The base of the movable contact plate is inserted and fixed into a groove cut in the insulating block, and the free end of the movable contact plate is driven by a drive piece that interlocks with the movable iron piece or its extension.

The tip of the fixed contact block is branched into a U shape.
Fixed contacts are provided on the outside of each leg, and movable contact plates each having a free end with a movable contact that comes into contact with and separates from the fixed contact are arranged on both sides of the fixed contact base so as to sandwich the fixed contact base. may be set.

Next, the present invention will be explained in detail based on the drawings.
FIGS. 5A and 5B are schematic diagrams showing one embodiment of the present invention. In FIGS. 5A and 5B, the electromagnetic device 2 is
Yokes 5 are provided at both ends of the elongated fixed core 4 around which the electromagnetic coil 3 is wound, forming a U-shaped fixed side core structure. It is attached to one half side. Of course, the structure of the fixed side iron core is that a yoke 5 is provided at one end of the fixed iron core 4 to form an integrated L-shape, and after fitting it into the electromagnetic coil 3, a yoke 5 is attached to the other end of the fixed iron core 4 to form a U-shape. It may be formed into a shape. The movable iron piece 6 is attached by a return spring 7 so that the yoke 5 on the opposite side of the contact device 10 described below serves as a fulcrum, and when its free end is attracted to the other yoke 5, both yokes 5 It is designed to bridge the
The contact device 10 is mounted on the base portion 8a at a distance in the longitudinal direction of the electromagnet device 2, and a plate-shaped fixed contact base 15 having fixed contacts on both sides of the insulating block 19 is mounted approximately on the axis of the electromagnet device 2. Electromagnet device 2
It is planted in a long direction. A movable contact plate 12 having a movable contact 13 corresponding to the fixed contact 14 at its tip is inserted into the groove 19a of the same insulating block 19 so as to sandwich the fixed contact base 15.
It is planted parallel to 5. Since the electromagnet device 2 and the contact device 10 are separated, the electromagnet device 2
The free end of the movable iron piece 6 is extended in the direction of the contact device 10, and the movable contact plate 12 is driven by a drive piece attached to the tip of the movable iron piece 6 to open and close the contact device 10. In this way, the electromagnet device 2 and the contact device 10 are separated as much as possible, and the external terminals 3a and 10a of the electromagnetic coil 3 and the contact device 10 are arranged in the longitudinal direction of the base portion 8a of the case 8 that houses and fixes the relay 1. Care is taken not to lead them to opposite sides and form large capacitances between them. Further, the external terminals 3a and 10a are configured to protrude from the back side of the base portion 8a so that they can be easily inserted into through holes of the printed board when mounting on the printed board. Also, the external terminals 3a, 1 of the base 8a
A sealant 20 is filled in the portion where Oa penetrates to prevent flux from entering during soldering work. Furthermore, although not shown in FIGS. 5A and 5B, an external terminal for grounding is drawn out from the base portion 8a like other external terminals. 9 is an insulating dustproof cover, and 9a is a protrusion provided inside the cover 9, which is a stopper for positioning the movable iron piece 6 when the movable iron piece 6 is not attracted.

FIG. 6 is a schematic diagram showing another embodiment, in which the electromagnet device 2 has an electromagnetic coil 3 wound around a rod-shaped fixed core 4, and an L-shaped yoke 5 attached to one end of the fixed core 4.
One leg 5a of the fixed core structure is joined, and the other leg extends parallel to the fixed core 4 to form a U-shaped fixed core structure with the opening facing the contact device 10. An L-shaped movable iron piece 6 is attached with the iron 5 as a fulcrum, and one leg 6a of the movable iron piece 6
When the leg 6a is attracted, the leg 6a bridges the opening of the fixed side core structure, and the other leg 6b extends toward the contact device 10 side, and the electromagnet device 2
The other leg of the yoke 5 is the base portion 8a of the fixed iron core 4.
It is attached to the base part 8 so as to be on the opposite side. Contact device 10 and external terminals 3a, 10a
is constructed exactly the same as that shown in FIG. 5, and the contact device 10 is driven by the free end of the L-shaped movable iron piece 6 extending toward the contact device 10 side via a drive piece 11.

FIG. 7 is a schematic diagram showing another embodiment. In this embodiment, it is shown in FIG. 6 that the electromagnet device 2 forms a fixed side iron core structure by a rod-shaped fixed iron core 4 around which an electromagnetic coil 3 is wound and an L-shaped yoke 5 attached to one end of the rod-shaped fixed iron core. However, the opening of the fixed side iron core structure is directed to the side opposite to the contact part 10, and the L-shaped movable iron piece 6 is attached using the yoke 5 of this fixed iron core structure as a fulcrum, and the movable iron piece 6 is When attracted to the fixed core 4, one side thereof bridges the opening of the fixed core structure, and the free end of the other side extends toward the contact device 10 on the opposite side of the electromagnetic coil 3. The contact device 10 includes a fixed contact base 1
5 is formed into a U-shape, and each of its legs is provided with a fixed contact 14, which corresponds to the contact 13 of a movable contact plate 12 provided on both sides of the fixed contact base in parallel with the fixed contact base. is configured to do so. 5 and 6, the free end of the movable iron piece 6 extending toward the contact device 10 drives the movable iron piece 6 via the drive piece 11.

The electromagnetic relay according to the present invention has the overall height H, width W, and the difference between them reduced compared to the conventional electromagnetic relay, and only the length L is made longer. It is easy to install a large number of them on the 18. 8A and 8B are exactly the same as shown in FIG. 4 except that a large number of electromagnetic relays 1 are mounted in a line on a printed board 18, but the electromagnetic relay 1 according to the present invention is In this case, since the electromagnetic relays 1 are arranged in a row, the external terminals 3a of the electromagnetic coils 3 and the external terminals 10a of the contact device 10 are arranged on one side, so that the terminals are not mixed and are close to each other. There is no interference with other relays due to capacitance. Furthermore, the configuration of the printed board becomes simpler.

The configuration of the electromagnet device is shown in Figure 5 A, B, and Figure 6.
The present invention is not limited to the configuration of the embodiment shown in the figures and FIG. 7.

As described above, the electromagnetic relay according to the present invention is
The electromagnetic device and the contact device are formed separately and long and thin, and are combined by arranging them in the length direction to reduce the cross-sectional area where they face each other to reduce stray capacitance, and also to reduce the overall height and width and the difference between them. By reducing the length and lengthening only the length, it was possible to rationalize the mounting of many on a printed board. In addition, the electromagnetic coil of the electromagnet device and the external terminals of the contact plate of the contact device are configured to protrude through the base portion at positions opposite to each other in the longitudinal direction of the case. The distance between the external terminals of the electromagnetic coil and the contact plate of the contact device can be increased, and especially when mounted on a printed circuit board, the patterns for high-voltage circuits and the patterns for electronic logic circuit elements can be reliably separated. This has the effect that it is possible to easily design a pattern on a printed board.

[Brief explanation of the drawing]

Fig. 1A, B and Fig. 2 A, B respectively show conventional electromagnetic relays, Fig. 1A is a plan view,
Figure B and Figure 2 A are side sectional views, respectively.
Figure B is a front view, Figure 3 is a simulated interface circuit between an electronic logic circuit and a high-voltage circuit, and Figures A and B are printed circuit boards equipped with conventional electromagnetic relays.
A is a plan view, B is a side view, FIGS. 5A, 6 and 7 are side sectional views of the electromagnetic relay according to the present invention, FIG. 5B is a front view of FIG. 5A,
8A and 8B show a printed circuit board equipped with an electromagnetic relay according to the present invention, where A is a plan view and B is a side view. 2... Electromagnetic device, 3... Electromagnetic coil, 3a... External terminal of electromagnetic coil, 4... Fixed iron core, 5... Yoke, 5
a... One leg of the yoke, 5b... The other leg, 6... Movable iron piece, 6a... One leg of the movable iron piece, 6b... The other leg of the movable iron piece, 7... Return spring, 8... Case, 8a
...Base part, 10... Contact device, 10a... External terminal of contact part, 11... Drive piece, 12... Movable contact plate,
13...Movable contact, 14...Fixed contact, 15...Fixed contact stand.

Claims (1)

[Scope of Claims] 1. An electromagnetic relay comprising a contact device and an electromagnetic device for operating the contact device housed in a case, the case being an elongated closed box consisting of a base portion and a cover portion. The contact device is housed on one side in the longitudinal direction of the box, and the electromagnet device is housed on the other side, and the contact device has a contactor having an opening/closing contact at its free end. The electromagnet device is attached to the one side of the base portion of the case with the longitudinal direction of the plate parallel to the longitudinal axis of the box body and the free end facing toward the center of the box body, and the electromagnetic device has an electromagnetic coil wound thereon. It has a rotated iron core and a movable iron piece that is attracted and released by the iron core, and is attached to the other side of the base portion of the case, and the free end of the movable iron piece or its extension is the free end of the contact plate. The electromagnetic coil of the electromagnetic device and the contact device are connected to the free end of the contact plate via a drive piece made of an insulating member so as to operate the part in a direction perpendicular to the longitudinal direction of the contact plate. 1. An electromagnetic relay characterized in that external terminals connected to the daughter board extend through a base portion at positions opposite to each other in the longitudinal direction of the case. 2. In the electromagnetic contactor according to claim 1, the fixed-side core structure of the electromagnetic device has an electromagnetic coil arranged around it, and yokes are provided at both ends of the fixed core parallel to the longitudinal direction of the box body. It is formed as a U-shaped iron core, and the movable iron piece of the electromagnet device is arranged so as to be able to bridge between the front end surfaces of both yokes of the U-shaped iron core, and is rotatable to the yoke on the opposite side of the contact device. An electromagnetic relay characterized by being supported by. 3. In the electromagnetic relay according to claim 1, the fixed side core structure of the electromagnet device includes a rod-shaped fixed core around which an electromagnetic coil is arranged and arranged parallel to the box body and the longitudinal axis, and the fixed core. The movable iron piece of the electromagnet device is configured in an L-shape, and one leg of the electromagnet device is connected to an end face of the base of the electromagnetic device, and the other leg is an L-shaped yoke that extends parallel to the fixed iron core. The electromagnetic device is rotatably supported on the other leg of the yoke so that the leg can come into contact with and separate from the end face of the distal end of the fixed iron core, and the electromagnet device is arranged so that the other leg of the yoke is on the base side of the fixed iron core. An electromagnetic relay, characterized in that the relay is attached to the base part so as to be located on the opposite side of the relay, and the other leg of the L-shape of the movable iron piece opens and closes a contact device. 4. The electromagnetic relay according to claim 3, wherein one leg of the movable iron piece of the electromagnet device is located on the contact device side of the electromagnet device. 5. The electromagnetic relay according to claim 3, wherein one leg of the movable iron piece of the electromagnet device is located on the opposite side of the electromagnet device from the contact device. 6. In the electromagnetic relay according to claim 1, the contact device is composed of an insulating block, a movable contact plate and a fixed contact base each having a switching contact at its free end, and the insulating block is attached to the base of the case. An electromagnetic relay, characterized in that the fixed contact base is embedded in the insulating block, and the base of the movable contact plate is inserted and fixed into a groove cut in the insulating block. 7. The electromagnetic relay according to claim 6, wherein the free end of the movable contact plate is driven by a drive piece that interlocks with a movable iron piece or an extension thereof. 8. In the electromagnetic relay according to claim 6, the tip of the fixed contact base is branched into a U-shape, and fixed contacts are provided on the outside of each U-shaped leg,
An electromagnetic relay characterized in that movable contact plates each having a free end portion with a movable contact that makes contact with and separates from the fixed contact are arranged on both sides of the fixed contact base so as to sandwich the fixed contact base.