JP2021036500A - Electromagnetic relay - Google Patents

Abstract

To provide an electromagnetic relay easily to assemble.SOLUTION: The electromagnetic relay includes: a rod (3) that moves with a movable iron core, on which first engaging parts (3a1, 3a2) are formed; and a second engaging part (4a) that can be engaged with the first engaging parts (3a1, 3a2) at a movable contact held by a rod(3). A movable contact (4) is configured to prevent the rotation around the rod (3) by the second engaging part (4a) when the same gets engaged with the first engaging part (3a1, 3a2) held by the rod (3).SELECTED DRAWING: Figure 2

Description

The present application relates to electromagnetic relays.

Various so-called solenoid-type electromagnetic relays, in which a movable iron core is attracted by an electromagnetic force to close or open a contact, have been conventionally developed and widely used. For example, in an electromagnetic switch device for a starter that starts an engine with a large displacement such as a bus or a truck, it is necessary to supply a large current in order to operate the electromagnetic switch device for the starter, and an electromagnetic relay is used as the current supply means. It is used.

The electromagnetic relay is installed near the electromagnetic switch device for the starter and is connected to the electric circuit by wiring, but it may be difficult to secure the installation space for the electromagnetic relay in the engine room, or it is connected to the electromagnetic relay. It may be difficult to arrange the wiring to be done. Therefore, conventionally, an electromagnetic switch device for a starter having a built-in electromagnetic relay that does not require an installation space and wiring has been proposed.

For example, in the conventional electromagnetic switch device for a starter disclosed in Patent Document 1, a pair of main fixed contacts and main movable contacts that open on the axial side of the suction coil are arranged, and the axial direction of the suction coil. A terminal block in which an auxiliary relay that opens on the opposite side of the terminal block is arranged, and a cover that has a through hole through which a secondary fixed contact penetrates with the auxiliary relay sealed on the opening side where the auxiliary relay of the terminal block is arranged. It is arranged between the auxiliary relay and the cover, and is equipped with an elastic member that fixes the auxiliary relay in the axial direction together with the terminal block and the cover.

The auxiliary relay in the conventional electromagnetic switch device for a starter disclosed in Patent Document 1 is an electromagnetic relay, and constitutes an electromagnetic relay that opens and closes an electric circuit that supplies power to a suction coil and a holding coil of the electromagnetic switch device for a starter. By electrically connecting the pair of fixed contacts and the pair of fixed contacts, the movable contacts that form an electric circuit that supplies power to the suction coil and holding coil of the electromagnetic switch device for the starter are movable. A movable iron core made of a magnetic material that generates a propulsive force that moves the contacts in the direction of a pair of fixed contacts, a coil that generates a magnetic field that generates a thrust in the movable iron core, and a joint that becomes part of the magnetic circuit of the coil magnetic field. It is equipped with iron and fixed iron cores that are arranged at both ends of the joint iron and are part of the magnetic circuit of the magnetic field of the coil. The contact chamber in which the above-mentioned pair of fixed contacts and movable contacts are present is covered with a cover.

Japanese Patent No. 6416439

In the electromagnetic relay disclosed in Patent Document 1, when the cover covering the contact chamber is assembled to the terminal block, the movable contact held by the rod rotates around the rod and is in a position deviated from the original position. In some cases, the movable contacts may interfere with the cover and the cover may not be assembled to the terminal block. Therefore, when assembling the cover to the terminal block, it is necessary to align the movable contacts held by the rods in advance, which causes a problem that the manufacturing process of the electromagnetic relay is increased.

The present application discloses a technique for solving the above-mentioned problems, and an object of the present application is to provide an electromagnetic relay that is easy to assemble.

The electromagnetic relay disclosed in the present application is
With the coil
A fixed iron core that is excited by energizing the coil to generate an attractive force,
A movable core that is attracted to the fixed core when the coil is excited and separates from the fixed core when the coil is deenergized.
A joint iron that constitutes a magnetic circuit together with the fixed iron core and the movable iron core,
The rod fixed to the movable iron core and
The movable contact held on the rod and
A holder that holds a fixed contact facing the movable contact,
A cover mounted on the holder and forming a contact chamber for accommodating the movable contact and the fixed contact.
It is an electromagnetic relay equipped with
The rod comprises a first engaging portion and
The movable contact comprises a second engaging portion capable of engaging the first engaging portion.
When the movable contact is held by the rod, the second engaging portion engages with the first engaging portion so that the rotation of the movable contact around the rod is prevented. Is composed of
It is characterized by that.

According to the electromagnetic relay disclosed in the present application, when the movable contact is held by the rod, the second engaging portion engages with the first engaging portion, so that the movable contact rotates around the rod. Therefore, when assembling the electromagnetic relay, the movable contact does not rotate around the rod, and an electromagnetic relay that can be easily assembled can be obtained.

It is sectional drawing of the electromagnetic relay by Embodiment 1. FIG. FIG. 5 is an exploded perspective view of a part of the electromagnetic relay according to the first embodiment. FIG. 5 is a plan view showing a rod and a movable contact of the electromagnetic relay according to the first embodiment. It is a top view which shows the rod and the movable contact of the electromagnetic relay by Embodiment 2. FIG. It is a perspective view which shows the relay of the electromagnetic relay by Embodiment 1 and Embodiment 2. It is a perspective view which shows the relay and the holder of the electromagnetic relay by Embodiment 1 and Embodiment 2.

Embodiment 1.
Hereinafter, the electromagnetic relay according to the first embodiment will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the electromagnetic relay according to the first embodiment, and FIG. 2 is an exploded perspective view of a part of the electromagnetic relay according to the first embodiment. In FIGS. 1 and 2, the coil 11 is wound around an outer peripheral portion of a cylindrical bobbin 10 having flanges at both ends in the axial direction. The first terminal of the coil 11 is electrically connected to the first terminal 9a fixed to the bobbin 10, and the second terminal of the coil 11 is electrically connected to the second terminal 9b fixed to the bobbin 10. It is connected to the.

The fixed iron core 13 includes a columnar fixed iron core main body 13a and a circular plate-shaped fixed iron core base 13c integrally formed at one end of the fixed iron body 13a in the axial direction. The fixed iron core main body 13a of the fixed iron core 13 is formed with a bottomed recess 13b reaching the fixed iron core base portion 13c at the central portion in the radial direction thereof. The fixed iron core main body 13a is inserted from one end in the axial direction of the bobbin 10 to the intermediate portion in the axial direction of the hollow portion 10a or its vicinity. The fixed iron core base portion 13c abuts on one flange portion of the bobbin 10 and closes one end portion of the hollow portion of the bobbin 10 in the axial direction.

The movable iron core 7 formed in a columnar shape is inserted into the hollow portion 10a from the other end in the axial direction of the bobbin 10 so as to be movable in the axial direction, and one end in the axial direction is the fixed core main body portion of the fixed iron core 13. It is arranged so as to face the other end in the axial direction of 13a. The return spring 12 composed of a compression spring inserted into the recess 13b of the fixed iron core main body 13a has one end in the axial direction abutting against the bottom of the recess 13b and fixed, and the other end in the axial direction is the movable iron core 7. It is fixed to one end in the axial direction of the above, and urges the fixed iron core 13 and the movable iron core 7 in the axial direction in a direction in which they are separated from each other.

Next, the joint iron 8 and the holder 6 will be described. FIG. 5 is a perspective view showing a relay of an electromagnetic relay according to the first embodiment and the second embodiment described later, and FIG. 6 shows a relay and a holder of the electromagnetic relay according to the first embodiment and the second embodiment described later. It is a perspective view which shows. In FIGS. 1, 2, 5, and 6, the joint iron 8 made of a magnetic material such as iron has a first joint iron portion 81, a second joint iron portion 82, and a first joint iron portion 82. A third iron joint portion 83 connected to the iron portion 81 and the second iron joint portion 82 is provided. The first iron joint 81 and the third iron 83 are connected to each other at a right angle of 90 degrees, and the second iron 82 and the third iron 83 are 90 degrees to each other. The joint iron 8 is formed in a U shape as a whole. A first claw portion 81b is formed at the end of the first joint iron portion 81, and similarly, a second claw portion 82b is formed at the end of the second joint iron portion 82. The third iron joint portion 83 is provided with a joint iron through hole 84 in the central portion.

The holder 6 made of an insulator made of an insulator such as a synthetic resin includes a tubular holder base 61 and a contact holding portion 62 integrally formed with the holder base 61. The third iron joint portion 83 is embedded in the holder base portion 61, whereby the joint iron 8 and the holder 6 are integrally fixed. The inner wall surface of the joint iron through hole 84 in the third joint iron portion 83 is aligned so as to be flush with the inner wall surface of the holder base 61, and is exposed from the inner wall surface of the holder base 61. The first iron joint portion 81 and the second iron joint portion 82 are arranged in line with respect to the virtual surface passing through the central axis X of the coil 11, and face each other with a distance from each other.

The first claw portion 81b of the first joint iron portion 81 and the second claw portion 82b of the second joint iron portion 82 are crimped to the fixed iron core base portion 13c. As a result, the joint iron 8 and the holder 6 are fixed to the fixed iron core 13. The joint iron 8 is arranged on the outer periphery of the bobbin 10 and is fixed to the fixed iron core 13 by the above-mentioned caulking to form the electromagnet 14. The holder 6 is fixed to the electromagnet 14 by fixing the first iron joint portion 81 and the second iron joint portion 82 to the fixed iron core 13. In this state, the tip of the holder base 61 is in contact with one of the collars of the bobbin 10.

The contact holding portion 62 of the holder 6 is provided with a through hole 6a that penetrates the hollow portion 61c of the holder base 61 and the recess 62c provided in the contact holding portion 62. The recess 62c is formed around the radial direction of the through hole 6a, and is formed so as to be depressed at a predetermined depth from the end surface of the contact holding portion 62. Further, the end surface of the contact holding portion 62 is provided with a first guide pin 62a and a second guide pin 62b extending perpendicularly to the end surface of the contact holding portion 62.

The first fixed contact 5a is positioned by penetrating the through hole through the first guide pin 62a, and is fixed to the end surface of the contact holding portion 62 of the holder 6. The through hole of the second fixed contact 5b is penetrated through the second guide pin 62b and positioned, and is fixed to the end surface of the contact holding portion 62 of the holder 6. The first fixed contact 5a and the second fixed contact 5b face each other with a gap.

The rod 3 formed in a columnar shape has a first flat surface portion 3d1 and a second flat surface portion 3d2 extending in the length direction of the rod 3. The first flat surface portion 3d1 and the second flat surface portion 3d2 are provided at positions different from each other by 180 degrees around the central axis of the rod 3, and the flat surface of the first flat surface portion 3d1 and the second flat surface portion 3d2. The planes are formed in parallel. Further, the rod 3 has a flange portion 3c in the vicinity of one end in the axial direction, a first protrusion 3a1 projecting vertically from the rod 3 in the radial direction of the rod 3, and a rod 3 in the radial direction of the rod 3. It has a second protruding portion 3a2 that protrudes vertically. The first protrusion 3a1 and the second protrusion 3a2 form a first engaging portion. The first protrusion 3a1 and the second protrusion 3a2 are integrally formed with the flange portion 3c, and as shown in FIG. 3 described later, each of the first protrusion 3a1 and the second protrusion 3a2 project in a rectangular shape in the radial direction of the rod 3. There is. The first protrusion 3a1 and the second protrusion 3a2 may be formed separately from the flange portion 3c.

The rod 3 is supported by the holder 6 by slidably penetrating the through hole 6a formed in the contact holding portion 62 of the holder 6 in the axial direction. At this time, the first flat surface portion 3d1 and the second flat surface portion 3d2 of the rod 3 are formed so as to face each other on the inner peripheral surface of the through hole 6a of the contact holding portion 62 (in FIG. 2). Is slidably in contact with (only one flat surface is displayed) in the axial direction. As a result, the rod 3 can move in the axial direction, but cannot rotate around the central axis X. The other end of the rod 3 in the axial direction is fitted to the recess 7a formed in the radial center of the movable iron core 7 and fixed to the movable iron core 7. By molding the rod 3 with a resin, it is possible to easily form a complicated shape such as a flange portion 3c, a first protrusion 3a1, and a second protrusion 3a2.

The plate-shaped movable contact 4 includes a rectangular through hole 4a. The through hole 4a constitutes a second engaging portion. The through hole 4a has an arcuate notch at the center of its long side. The movable contact 4 is penetrated by one end of the rod 3 at a position where the through hole 4a corresponds to the above-mentioned arc-shaped notch. In that state, the movable contact 4 is placed on the surface of the flange portion 3c of the rod 3.

FIG. 3 is a plan view showing the rod and the movable contact of the electromagnetic relay according to the first embodiment. As is well shown in FIG. 3, in a state where the movable contact 4 is placed on the surface of the flange portion 3c of the rod 3, the rectangular through hole 4a of the movable contact 4 is the first rod 3. It is engaged with the protrusion 3a1 of the above and the second protrusion 3a2. That is, the first engaging portion of the rod 3 is engaged with the second engaging portion of the movable contact 4. As a result, the rotation of the movable contact 4 around the rod 3 is prevented. The arrow in FIG. 3 indicates the direction of the current flowing through the movable contact 4. The long side direction of the rectangular through hole 4a provided in the movable contact 4 is formed so as to be the same direction as the direction of the current flowing through the movable contact 4 or a direction close to the direction of the current. By forming in this way, it is not necessary to increase the size of the movable contact in order to keep the current density below the specified value.

The cover 1 made of an insulator formed of synthetic resin or the like has a first through hole 1a, a second through hole 1b, and a spring accommodating portion 1c for accommodating a pressure contact spring 2 described later inside. The first guide pin 62a of the contact holding portion 62 is inserted into the first through hole 1a of the cover 1, and the second guide pin 62b of the contact holding portion 62 is inserted into the second through hole 1b of the cover 1. As a result, the cover 1 is positioned with respect to the contact holding portion 62, and the cover 1 is placed on the contact holding portion 62 of the holder 6 via the first fixed contact 5a and the second fixed contact 5b. In the cover 1 mounted on the contact holding portion 62 of the holder 6, the first fixing member 63a is coupled to the first guide pin 62a, and the second fixing member 63b is coupled to the second guide pin. It is fixed to the contact holding portion 62.

The pressure contact spring 2 composed of the compression spring is housed inside the spring storage part 1c of the cover 1, one end in the axial direction abuts on the inner wall of the spring storage part 1c, and the other end in the axial direction is a movable contact. It is in contact with the surface of 4. The pressure contact spring 2 urges the movable contact 4 in the direction of the first fixed contact 5a and the second fixed contact 5b. The elastic force of the pressure contact spring 2 is set to be smaller than the elastic force of the return spring 12 described above.

The contact chamber 1d is formed by fixing the cover 1 to the contact holding portion 62 of the holder 6. In the contact chamber 1d, the contact portion of the first fixed contact 5a and the contact portion of the second fixed contact 5b are exposed, and the movable contact 4 is further fixed to the contact portion of the first fixed contact 5a and the second fixed contact. It is exposed facing the contact portion of the contact 5b.

Next, an example of the assembly work of the electromagnetic relay according to the first embodiment will be described. First, as a first step, the first fixed contact 5a and the second fixed contact 5b are attached to the contact holding portion 62 of the holder 6 as described above, and the rod 3 is attached to the through hole 6a of the contact holding portion 62. Insert and attach the rod 3 to the holder 6. The work of attaching the first fixed contact 5a and the second fixed contact 5b to the contact holding portion 62 may be performed before the third step described later.

As a second step, the first joint iron portion 81 and the second joint iron portion 82 of the joint iron 8 integrally formed with the holder 6 are arranged on the outer periphery of the coil 11 wound around the bobbin 10. The electromagnet 14 is assembled by fixing it to the fixed iron core 13 by the above-mentioned caulking. By this second step, the holder 6 is mounted on the electromagnet 14.

As a third step, the movable contact 4 is attached to the rod 3. At this time, the rectangular through hole 4a of the movable contact 4 is fitted and engaged with the first protrusion 3a1 and the second protrusion 3a2 of the rod 3, and the movable contact 4 is the flange portion of the rod 3. It is placed on the surface of 3c. The surface of the flange portion 3c serves as a receiving surface for the movable contact 4.

As a fourth step, the pressure contact spring 2 is attached to one end of the rod 3, and the pressure contact spring 2 is placed on the surface of the movable contact 4.

As a fifth step, the cover 1 is attached to and fixed to the contact holding portion 62 of the holder 6. At this time, the cover 1 has the first guide pin 62a inserted into the first through hole 1a, and the second guide pin 62b is inserted into the second through hole 1b, whereby the cover 1 has a contact with respect to the contact holding portion 62. Although the cover 1 is positioned, the movable contact 4 is mounted on the rod 3 so that it cannot rotate around the rod 3, so that the movable contact rotates around the rod 3 as in a conventional device. , The movable contact 4 does not interfere with the attachment of the cover 1 to the contact holding portion 62. When the fifth step is completed, the movable contact 4 is urged by the pressure contact spring 2 in the direction of the first fixed contact 5a and the second fixed contact 5b.

The above-mentioned assembly work steps are an example, and the order of each step is not limited to the above, and any of the steps may be combined or another step may exist.

Next, the operation of the electromagnetic relay according to the first embodiment will be described. FIG. 1 shows a state in which the coil 11 is not urged and the movable iron core 7 is separated from the fixed iron core 13 by the return spring 12. At this time, the movable contact 4 is pressed toward the anti-fixed contact side by the rod 3 and is in contact with the inner wall of the contact chamber 1d of the cover 1, and the first fixed contact 5a and the second fixed contact 5b are blocked. It is in a state and has an open electrical circuit connected to an electromagnetic relay.

When the coil 11 is urged, the movable core 7 is attracted to the fixed core 13 against the elastic force of the return spring 12, and the rod 3 moves from the state shown in FIG. 1 to the fixed core 13 side together with the movable core 7. To do. The movable contact 4 moves with the movement of the rod 3 and comes into contact with the first fixed contact 5a and the second fixed contact 5b to electrically connect them. At this time, the movable contact 4 contacts the first fixed contact 5a and the second fixed contact 5b by the contact pressure based on the elastic force of the pressure contact spring 2, and closes the electric circuit connected to the electromagnetic relay.

Embodiment 2.
Next, the electromagnetic relay according to the second embodiment will be described. FIG. 4 is a plan view showing the rod and the movable contact of the electromagnetic relay according to the second embodiment. As is well shown in FIG. 4, in a state where the movable contact 4 is placed on the surface of the flange portion 3c of the rod 3, the oval through hole 4b of the movable contact 4 is the rod 3. The protrusion 3b1 of 1 and the second protrusion 3b2 are fitted and engaged with each other. That is, the first engaging portion of the rod 3 is engaged with the second engaging portion of the movable contact 4. As a result, the rotation of the movable contact 4 around the rod 3 is prevented. The arrow in FIG. 4 indicates the direction of the current flowing through the movable contact 4. The long side direction of the oval through hole 4a provided in the movable contact 4 is formed so as to be the same direction as the direction of the current flowing through the movable contact 4 or a direction close to the direction of the current. By forming in this way, it is not necessary to increase the size of the movable contact in order to keep the current density below the specified value.

Other configurations, operations, and assembly work procedures of the electromagnetic relay according to the second embodiment are the same as those of the electromagnetic relay according to the first embodiment described above.

Although exemplary embodiments and examples are described in the present application, the various features, embodiments, and functions described in one or more embodiments are limited to the application of a particular embodiment. Rather than being applied, it can be applied to embodiments alone or in various combinations. Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed in the present application. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 cover, 2 pressure spring, 3 rod, 3a1, 3b1 first protrusion,
3a2, 3b2 2nd protrusion, 3c collar, 4 movable contacts, 4a, 4b through holes,
5a 1st fixed contact, 5b 2nd fixed contact, 6 holder, 61 holder base,
62 Contact holding part, 7 Movable iron core, 8 Joint iron, 81 First iron joint part,
82 2nd iron joint part, 83 3rd iron joint part, 84 iron joint through hole, 81b 1st claw part,
82b 2nd claw, 10 bobbins, 11 coils, 12 return springs,
13 Fixed core, 13a Fixed core body, 13c Fixed core base, 14 Electromagnet

The electromagnetic relay disclosed in the present application is
With the coil
A fixed iron core that is excited by energizing the coil to generate an attractive force,
A movable core that is attracted to the fixed core when the coil is excited and separates from the fixed core when the coil is deenergized.
A joint iron that constitutes a magnetic circuit together with the fixed iron core and the movable iron core,
The rod fixed to the movable iron core and
The movable contact held on the rod and
A holder having a contact holding portion for holding a fixed contact facing the movable contact,
A cover mounted on the holder and forming a contact chamber for accommodating the movable contact and the fixed contact.
It is an electromagnetic relay equipped with
The contact holding portion includes a through hole having a flat portion formed on the inner peripheral surface.
It said rod is provided with a flat portion slidably abutting against the axial direction of the rod to the flat portion when it is inserted into the through hole, a first engaging portion,
The movable contact comprises a second engaging portion capable of engaging the first engaging portion.
When the movable contact is held by the rod, the second engaging portion engages with the first engaging portion, so that the movable contact centered on the rod inserted into the through hole. Is configured to prevent the rotation of
It is characterized by that.

Claims (6)

With the coil
A fixed iron core that is excited by energizing the coil to generate an attractive force,
A movable core that is attracted to the fixed core when the coil is excited and separates from the fixed core when the coil is deenergized.
A joint iron that constitutes a magnetic circuit together with the fixed iron core and the movable iron core,
The rod fixed to the movable iron core and
The movable contact held on the rod and
A holder that holds a fixed contact facing the movable contact,
A cover mounted on the holder and forming a contact chamber for accommodating the movable contact and the fixed contact.
It is an electromagnetic relay equipped with
The rod comprises a first engaging portion and
The movable contact comprises a second engaging portion capable of engaging the first engaging portion.
When the movable contact is held by the rod, the second engaging portion engages with the first engaging portion so that the rotation of the movable contact around the rod is prevented. Is composed of
An electromagnetic relay characterized by that. The first engaging portion is composed of a protruding portion that protrudes in the radial direction of the rod.
The second engaging portion is composed of a through hole formed in the movable contact.
The electromagnetic relay according to claim 1. The protrusion is formed in a rectangular shape extending in the radial direction of the rod.
The through hole is formed in a rectangular shape that can engage with the protrusion.
2. The electromagnetic relay according to claim 2. The rectangular through hole formed in the movable contact is formed so that its length direction is the same as the direction of the current flowing through the movable contact or a direction close to the direction of the current.
The electromagnetic relay according to claim 3, wherein the electromagnetic relay according to claim 3. The protrusion is formed in an oval shape extending in the radial direction of the rod.
The through hole is formed in an oval shape that can engage with the protrusion.
2. The electromagnetic relay according to claim 2. The oval-shaped through hole formed in the movable contact is formed so that its length direction is the same as the direction of the current flowing through the movable contact or a direction close to the direction of the current.
The electromagnetic relay according to claim 5.

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