JPH0112366Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in electromagnetic switches.

Conventionally, the switch shown in FIG. 1 has been known as this type of switch. That is, the movable core 24, which is reciprocated based on the energization and de-energization of the electromagnet 22, which includes the fixed core 23 fixed to the yoke 21, has a long shape in the axial direction, and has an insulating bush 25a fixed to the stepped portion thereof. A movable contact 26 is mounted between insulating bushes 25b that are slidable in the axial direction of the movable core 24, and the movable contact 26 is insulated from the movable core 24. Further, a circumferential groove 24a is formed near the tip of the movable iron core 24 on the fixed iron core 23 side, and the circumferential groove 24a
A contact spring 28 and a flat washer 29 are fitted between the insulating bushing 25b and the stop ring 27, and the spring force of the contact spring 28 urges the insulating bushing 25b to the left in FIG. The movable contact 26 is sandwiched between the insulating bushes 25a and 25b, and the movable contact 26 is structured to reciprocate integrally with the movable iron core 24.

However, in such a conventional structure, the fixed core 23 and the movable core 24 have different shapes, so they cannot be used in common, and the number of types of parts increases, which increases the number of management steps. In addition, the movable iron core 24, the insulating bushes 25a, 2
5b, the movable contact 26, etc., the total weight of the movable members is large, so when this electromagnetic switch is used in, for example, a car with strong vibrations, a particularly large attraction force is required, and the electromagnet 22 becomes large and expensive. It had its drawbacks.

The present invention has been devised in view of the above-mentioned drawbacks of the conventional art, and aims to provide an electromagnetic switch that has fewer types of parts, does not require a large attraction force, and allows the electromagnet to be miniaturized.

In order to achieve the above object, the electromagnetic switch according to the present invention has a structure including an electromagnet with a fixed core, and a movable switch that is slidably attached to the inner periphery of a coil bobbin that constitutes a part of the electromagnet, and that faces the fixed core. It has an iron core and a return spring that urges the movable iron core in a direction away from the fixed iron core, and the movable iron core faces a movable contact and faces the movable contact by reciprocating motion of the movable iron core based on the energization and de-energization of the electromagnet. In an electromagnetic switch that opens and closes between fixed contacts provided in the same manner, the fixed core and the movable core have the same shape with flanges provided on their opposing surfaces and opposite end surfaces, respectively, and the flanges of the fixed core are connected to the coil bobbin and the yoke. At the same time, the movable contact is attached to a movable contact holding member separate from the movable iron core, and a contact spring of the movable contact urges the movable contact holding member toward the movable iron core. The flange of the movable iron core and the movable contact holding member are brought into abutting state when the electromagnet is not energized.

The present invention will be explained below based on an embodiment shown in FIG.

1 is a yoke, and 2 is an electromagnet equipped with a fixed iron core 3. A coil bobbin 5 on which an electromagnetic coil 4 constituting a part of the electromagnet 2 is wound is mounted inside the yoke 1. Reference numeral 6 denotes a magnetic path plate that is press-fitted and fixed to the yoke 1. A movable core 7 is disposed facing the fixed core 3 and is slidably attached to the inner periphery of the coil bobbin 5.
have the same shape. Step portions 3a and 7a are formed on the fixed core 3 and the movable core 7, respectively.
A return spring 8 is installed between a and 7a to urge the movable core 7 away from the fixed core 3, that is, to the right in FIG. Flanges 3b and 7b are formed on the opposite end surfaces of the fixed iron core 3 and the movable iron core 7, respectively.
The fixed iron core 3 is firmly fixed by being sandwiched between the two.

Reference numeral 9 denotes a movable contact holding member to which a movable contact 10 is attached, and is separated from the movable iron core 7. In the illustrated embodiment, the movable contact holding member 9 is made of an insulating material, and the head 9a and the shaft portion 9 connected to the head 9a are
A stepped portion is formed on the head 9a, and the movable contact 10 is press-fitted and fixed thereto. The shaft portion 9b of the movable contact holding member 9 is formed into an annular groove 11a in a switch housing 11 made of an insulating material fixed to the yoke 1.
The contact spring 12 of the movable contact 10, which has a smaller spring force than the return spring 8, is disposed in the annular groove 11a and is movable. By bringing it into contact with the contact 10,
The movable contact holding member 9 is urged toward the movable iron core 7 side, and the flange 7b of the movable iron core 7 and the head 9a of the movable contact holding member 9 are brought into butt state as shown in FIG. 2 when the electromagnet 2 is not energized. There is. The switch housing 11 is formed with a stepped surface 11c against which the movable contact 10 abuts, and restricts the amount of rightward movement of the movable iron core 7 and the movable contact holding member 9.

Reference numerals 13 and 14 are a pair of fixed contacts provided opposite to the movable contact 10, respectively, and fixed to the switch housing 11.

In the above configuration, when the electromagnetic coil 4 is energized, the electromagnet 2 is excited and the movable core 7 is attracted toward the fixed core 3 from the state shown in FIG. 2 and moves to the left. Therefore, the movable contact holding member 9 similarly moves to the left due to the spring force of the contact spring 12, and the movable contact 10 contacts the pair of fixed contacts 13, 14 with a predetermined contact pressure, and the movable contact 10 contacts the pair of fixed contacts 13, 14 with a predetermined contact pressure. Make conductive. At this time, the flange 7b of the movable iron core 7 and the head 9a of the movable contact holding member 9 are not in contact with each other, but are configured so that a predetermined gap is created. Next, when the power to the electromagnetic coil 4 is cut off, the electromagnet 2 becomes de-energized, and the movable iron core 7 is moved to the right by the spring force of the return spring 8, and the movable contact holding member 9
The head 9a of the vehicle collides with the head 9a of the vehicle. Here, since the contact spring 12 has a smaller spring force than the return spring 8, the movable contact holding member 9 is pushed to the right, and the movable contact 10 is connected to the pair of fixed contacts 1.
3 and 14, and the conduction between the fixed contacts 13 and 14 is cut off, and then the movable iron core 7 and the movable contact holding member 9 are returned to their original positions shown in FIG. In this way, the opening/closing operation of the electromagnetic switch is obtained. Furthermore, even if welding occurs between the movable contact 10 and the fixed contact 13 or 14, the movable core 7 will collide with the head 9a of the movable contact holding member 9, and the impact force will peel off the welded contact. be able to.

However, in this embodiment, the movable contact holding member 9 to which the movable contact 10 is attached is separated from the movable core 7, and the fixed core 3 and the movable core 7 have the same shape, so that parts can be made common. The number of types of parts is reduced, and the number of management steps is correspondingly reduced. Furthermore, since the weight of the movable core 7 attracted to the fixed core 3 is reduced, the response speed of the movable core 7 becomes faster and a large attraction force is not required, making the electromagnet 2 smaller and cheaper. Furthermore, since the flange 7b is formed on the movable core 7, the effective magnetic path facing the magnetic path plate 6 can be increased, making it possible to further downsize the electromagnet 2.Furthermore, the flange 3b is formed on the fixed core 3. However, the stationary core 3 can be firmly fixed simply by sandwiching the flange 3b between the bottom surface of the yoke 1 and the coil bobbin 5, so that caulking, welding, etc. are not required, and manufacturing is facilitated.

In this embodiment, the movable contact 10 is fixed to the movable contact holding member 9, but the movable contact 10 is always connected to the movable iron core 7 by the contact spring 12.
Since the movable contact 10 is biased toward the side, it is possible to simply fit the movable contact 10 into the stepped portion formed on the head 9a.

As described above, according to the present invention, the fixed core and the movable core have the same shape with flanges provided on the opposing surfaces and the opposite end surface, respectively, so parts can be shared, reducing the number of types of parts, and managing the parts. In addition to reducing man-hours, since the fixed core is fixed by sandwiching the flange of the fixed core between the coil bobbin and the yoke, there is no need for caulking or welding during fixation, making manufacturing easier.

In addition, since the movable contact is attached to a movable contact holding member separate from the movable core, the weight of the movable core is reduced, the response speed of the movable core becomes faster, and a large attraction force is not required, allowing the electromagnet to be made smaller. This has the effect of making it cheaper.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of a conventional electromagnetic switch, and FIG. 2 is a longitudinal sectional view showing an embodiment of the electromagnetic switch according to the present invention. 1... Yoke, 2... Electromagnet, 3... Fixed iron core, 3b... Flange, 5... Coil bobbin, 7
...Movable iron core, 7b...Flange, 8...Return spring, 9...Movable contact holding member, 10...
...Movable contact, 12...Contact spring, 1
3, 14...Fixed contact.

Claims (1)

[Scope of utility model registration request] An electromagnet having a fixed core, a movable core that is slidably mounted on the inner periphery of a coil bobbin constituting a part of the electromagnet and faces the fixed core, and the movable core is attached in a direction away from the fixed core. The reciprocating movement of the movable iron core based on the energization and de-excitation of the electromagnet,
In an electromagnetic switch that opens and closes between a movable contact and a fixed contact provided opposite to the movable contact, the fixed core and the movable core have the same shape with a flange provided on the opposing surface and the opposite end surface, respectively. The flange of the fixed core is held between the coil bobbin and the yoke to fix the fixed core, and the movable contact is attached to a movable contact holding member separate from the movable core, and the movable contact is held by the contact spring of the movable contact. An electromagnetic switch characterized in that a member is biased toward the movable core so that a flange of the movable core and a movable contact holding member are brought into a butt state when the electromagnet is not energized.