JPH0511278U - Electromagnetic relay - Google Patents

Abstract

(57) [Abstract] [Purpose] To make it possible to easily assemble without destabilizing the operating characteristics, and to reduce the collision noise of the armature against the iron core without being affected by the number of times of opening and closing. [Constitution] The permanent magnet 6 has its one pole surface 6a magnetized.
Is arranged so as to face one surface 4d of the armature 4 which is suction-released to the iron core 1. Therefore, the impact force when the armature 4 collides with the iron core 1 can be buffered by utilizing the repulsive force of the permanent magnet 6 without mechanically contacting the armature 4 with a buffer member. It can be easily assembled without changing the stroke amount of the armature 4 and making the operating characteristics unstable, and the repulsive force of the permanent magnet 6 does not change even if the number of times of opening and closing increases, and its effectiveness can be maintained. Becomes

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an electromagnetic relay used for in-vehicle use, crime prevention, etc. that requires noise reduction.

[0002]

[Prior Art]

 As a conventional electromagnetic relay, an iron core, a coil wound around the iron core, a yoke fixed to the iron core, an armature that is attracted and released to the iron core, and an armature that opens and closes in response to the armature. And a shock-absorbing member such as a rubber or a spring that cushions the shock when the armature is attracted is disposed between the armature and the iron core.

[0003]

[Problems to be solved by the device]

 In an ordinary electromagnetic relay, both the armature and the iron core are made of metal, so when the coil is excited and the armature is attracted to the iron core, a relatively high and loud collision noise is generated. Therefore, when an electromagnetic relay is used for an in-vehicle application or a crime prevention application where noise reduction is required, it is required to reduce the collision noise.

Therefore, in the above-described conventional electromagnetic relay, when the armature is attracted to the iron core, a cushioning member such as rubber or a spring that comes into contact with the armature to cushion the shock is used as the armature and the iron. It is arranged between the core and the core.

However, since the cushioning member mechanically abuts the armature to cushion the shock, the cushioning member is narrow between the armature and the iron core so as not to cause variation in the size of abutting the armature. It is difficult to dispose it in the armature, and the variation in the stroke of the armature makes the operating characteristics unstable, and when the number of times of opening and closing increases and the cushioning member becomes fatigued, its effectiveness is also increased. It will disappear.

The present invention has been made in view of the above circumstances, and an object of the present invention is to easily assemble without destabilizing operation characteristics, and further, to provide an armature without being affected by the number of times of opening and closing. An object of the present invention is to provide an electromagnetic relay capable of reducing the collision noise of the iron core.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, an electromagnetic relay of the present invention includes an iron core, a coil wound around the iron core, a yoke fixed to the iron core, and an armature that is sucked and released to the iron core. An electromagnetic relay having a contact portion that opens and closes in response to an armature, in which a permanent magnet is arranged with one magnetized magnetic pole surface facing one surface of the armature that is attracted and released. I am doing it.

[0008]

[Action]

 According to the electromagnetic relay of the present invention, when the coil is DC-excited and the polarity of the armature is the same as that of one pole face of the permanent magnet facing it, the armature is attracted to the iron core and becomes closer to the pole of the permanent magnet. When the armature collides with the iron core due to the strong repulsive force and the operating speed is greatly reduced, the collision noise can be reduced. In other words, since the impact force at the time of collision is buffered by utilizing the repulsive force of the permanent magnet, the buffer member arranged between the narrow armature and the iron core is mechanically brought into contact with the armature. Unlike the conventional example, the stroke of the armature does not change and the operating characteristics are not unstable, and the assembly is easy, and the repulsive force of the permanent magnet does not change even if the number of times of opening and closing increases. The effect can be maintained.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes an iron core, which is formed of a magnetic material such as electromagnetic soft iron into a substantially rod shape with one end 1a having a large diameter.

Reference numeral 2 denotes a coil, which is wound around the iron core 1 via the winding body portion 21 a of the coil frame 21, and both ends thereof are connected to coil terminals 21 b provided on the coil frame 21.

Reference numeral 3 denotes a yoke, which is made of a magnetic material such as electromagnetic soft iron into an L-shape with one piece 3a and the other piece 3b. It is fixed to the other end 1b of the core 1.

Reference numeral 4 denotes an armature, which is made of a magnetic material such as electromagnetic soft iron and is formed into a flat plate shape. The base end 4b of the yoke 3 is connected to the end 4a of the iron core 1 so that the central part 4a is sucked and released. On the other hand, it is rotatably supported on the end of the piece 3a, and the tip 4c extends beyond the one end 1a of the iron core 1.

Reference numeral 5 denotes a contact portion, which is a fixed contact 5a provided at one end of a contact terminal 5b fixed to the coil frame 21 and a tip of a movable spring 5d fixed to the armature 4 so as to contact and separate from the fixed contact 5a. It consists of a movable contact 5c installed in the section. The other end of the movable spring 5d is extended and fixed to the one piece 3a of the yoke 3, and the base end 4b of the armature 4 is rotatably supported by the end of the one piece 3a of the yoke 3. , Armature 4 is urged to be released from iron core 1.

Reference numeral 6 denotes a permanent magnet, which is magnetized in the plate thickness direction to be formed into a flat plate shape, and one of the magnetized magnetic pole surfaces 6a is a side to be attracted and released to one end 1a of the iron core 1. It is fixed to a concave portion provided in the flange portion of the coil frame 21 so as to be arranged so as to face the one surface 4d of the tip portion 4c of the pole piece 4. In this case, when the armature 4 is attracted to the one end 1a of the iron core 1, the one surface 4d of the tip 4c thereof is set so as not to hit the one magnetic pole surface 6a of the permanent magnet 6.

Next, the operation will be described. Now, as shown in FIG. 1, it is assumed that the one magnetic pole surface 6a of the permanent magnet 6 is magnetized to the N pole. When the coil 2 is DC-excited so that the one end 1a of the iron core 1 becomes the S pole, the tip 4c of the armature 4 becomes the N pole and becomes the same pole as the one pole face 6a of the permanent magnet 6. , As the central portion 4a of the armature 4 is attracted to the one end portion 1a of the iron core 1 and collides with the one end portion 1a while receiving a stronger repulsive force from the permanent magnet 6 and is provided at the tip portion of the movable spring 5d. The movable contact 5c comes into contact with the fixed contact 5a with a predetermined contact pressure.

FIG. 2 shows this state. In the figure, the horizontal axis X is the stroke of the armature 4, the vertical axis Y is the load applied to the armature 4, G is the spring load curve, A is the repulsive force of the permanent magnet 6, and B is the permanent magnet 6. In this case, C is the attractive force when the repulsive force of the permanent magnet 6 is taken into consideration. As can be seen from the figure, when the armature 4 has a large stroke, that is, when the armature 4 is released from the iron core 1, the repulsive force A of the permanent magnet 6 is small, so the attractive force C is the attractive force B. Although there is almost no change, the repulsive force A of the permanent magnet 6 increases at an accelerated rate as the armature 4 is attracted to the iron core 1 and approaches, so the attractive force C becomes smaller than the attractive force B by that amount. As a result, the armature 4 has its operation speed most greatly reduced when it collides with the iron core 1, so that the impact force at the time of collision is buffered and the collision noise is also reduced. Of course, at this time, the suction force C is larger than the spring load curve G and does not affect the contact pressure of the contact portion 5.

In such an electromagnetic relay, as described above, the repulsive force of the permanent magnet 6 is used to buffer the impact force when the armature 4 collides with the iron core 1. As in the case of the conventional example, the permanent magnet 6 has one magnetized magnetic pole surface 6a at one end of the iron core 1 without changing the stroke of the armature 4 and making the operating characteristics unstable. The armature 4 can be easily assembled so that the armature 4 is arranged facing the one surface 4d of the tip 4c of the armature 4 on the side where the armature 4 is sucked and released. Since it does not hit the 6 and does not wear, the repulsive force of the permanent magnet 6 remains unchanged and its effectiveness can be maintained.

[0019]

[Effect of the device]

 Since the electromagnetic relay of the present invention is configured as described above, the impact sound when the armature collides with the iron core is buffered by using the repulsive force of the permanent magnet, so that the impact sound is generated. Therefore, it is possible to reduce the stroke amount of the armature as in the case of the conventional example in which the buffer member arranged between the narrow armature and the iron core is mechanically brought into contact with the armature. Change and the operating characteristics are not destabilized, and the assembly is easy, and the repulsive force of the permanent magnet does not change even if the number of times of opening and closing increases, and its effectiveness can be maintained.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a suction force and a spring load curve of the same.

[Explanation of symbols]

 1 Iron core 2 Coil 3 Yoke 4 Armature 4d One side 5 Contact point 6 Permanent magnet 6a One pole side

Claims (1)

[Claims for utility model registration] [Claim 1] An iron core, a coil wound around the iron core, a yoke fixed to the iron core, an armature sucked and released to the iron core, and an armature. In the electromagnetic relay having a contact portion that is opened and closed in response to the magnetic field, a permanent magnet is arranged with the magnetized one magnetic pole surface facing the one surface of the armature that is attracted and released. Electromagnetic relay.