JPH10241531A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts items and to improve assemblability by extending an impact buffer spring from a hinge spring, the buffer spring functioning to soften impacts given to an iron core by suppressing an armature directed to the iron core in the midway, and integrating the hinge spring and the impact buffer spring. SOLUTION: A hinge spring 12 includes an action part 12b extended in a horizontal direction from a pressing-in part 12a pressed into a body and bent in an L shape and an impact buffer spring 19 extended from the action part 12b. The impact buffer spring 19 includes a support part 19a provided in the tip of the action part 12b and a spring part 19b provided in the support part 19a. The spring part 19b extended in a forked shape is disposed from the support part 19a in the outer periphery of the adsorption part 22b of an iron core 22, and the spring part 19b is placed to face one end part 14a of an armature 14. Thus, biting between one end part 14a of the armature 14 and the adsorption part 22b of the iron core 22 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement of an electromagnetic relay.

[0002]

2. Description of the Related Art As an electromagnetic relay, for example, Shohei Shokai
140737 publication "Electromagnetic relay" is known. The following figure shows an electromagnetic relay similar to this electromagnetic relay.

FIG. 7 is a sectional view of a conventional electromagnetic relay.
A conventional electromagnetic relay 100 includes a resin body 101,
An electromagnet 102 attached to the body 101 and an armature 103 attached to one end of the electromagnet 102 so as to be able to swing.
A hinge spring 104 for pressing the armature 103 against one end of the electromagnet 102, a driving piece 105 that moves at the other end of the armature 103, a switch mechanism 106 that is closed by the pushing action of the driving piece 105, and a body 101. And a cover 107 attached to the cover.

The electromagnet 102 includes a coil 112 wound around a bobbin 111, an iron core 113 attached to the bobbin 111 so as to penetrate the coil 112, a yoke 114 connecting one end of the iron core 113, and a lower part of the bobbin. And a shock-absorbing spring 115 attached to the The switch mechanism 106 includes the driving piece 1
The contact spring 117 is moved by the pushing action of the contact spring 06, and a contact terminal plate 118 that performs a switching operation by contacting the contact spring 117.

When a predetermined voltage is applied to the electromagnet 102,
One end of the armature 103 is drawn to the iron core 113 of the electromagnet 102 as shown by an arrow. Since the armature 103 is attached so as to be able to swing, the other end of the armature 103 moves as shown by the arrow and pushes out the driving piece 105 linearly. Contact spring 117
Is moved by the pushing action of the driving piece 106 and is
, And performs a switch operation. On the other hand, one end of the armature 103 starts to hit the buffer spring 115 and receives a force in the direction opposite to the arrow while being drawn to the iron core 113 of the electromagnet 102 as shown by the arrow. Therefore, the armature 10 is attached to the iron core 113.
The impact sound when one end of the vehicle 3 collides can be reduced.

[0006]

However, since the buffer spring 115 in the conventional electromagnetic relay 100 is a small part, it is difficult to mount the buffer spring 115, and the spring pressure of the buffer spring 115 varies widely, and the amount of impact sound absorption is reduced. There was also a problem that was not constant.

Accordingly, an object of the present invention is to provide an electromagnetic relay having good assemblability.

[0008]

In order to achieve the above object, a first aspect of the present invention is to apply a valley portion of a substantially L-shaped armature to a fulcrum provided on a yoke of an electromagnet, and direct the armature toward the fulcrum. And push it with a hinge spring so that one end of the armature faces the iron core of the electromagnet.
With the other end of the armature facing the switch mechanism, the armature is swung by the suction action of the iron core, and the armature facing the iron core is suppressed from the middle in an electromagnetic relay that pushes the switch mechanism with this armature. The electromagnetic shock relay spring, which acts to reduce the impact on the iron core, is extended from the hinge spring to form an electromagnetic relay. Extend the shock absorbing spring from the hinge spring,
The impact on the iron core was reduced by suppressing the movement of the armature toward the iron core. Since the hinge spring and the shock absorbing spring are integrated, the number of parts can be reduced and the assemblability can be improved.

A second aspect of the present invention is characterized in that the armature is provided with a hole or a notch for penetrating the impact spring. Since the armature is provided with a hole or a notch for penetrating the shock absorbing spring, it is not necessary to dispose the shock absorbing spring so as to be bypassed, and the shock absorbing spring can be formed in a simple shape.

According to a third aspect of the present invention, a horizontal axis represents the distance between the armature and the iron core, and a hyperbolic attractive force characteristic curve is drawn on a graph in which the vertical axis represents the attractive force of the electromagnet. When a spring load characteristic line is drawn on a graph with the spring load as the vertical axis, the spring load characteristic line to which the shock absorbing spring is added is within the range of the suction force characteristic curve before the shock absorbing spring is extended from the hinge spring. Is characterized in that: The spring load characteristic line to which the shock absorbing spring is added is within the range of the suction force characteristic curve before the shock absorbing spring is extended from the hinge spring, so that even when the shock absorbing spring is added, the operating voltage of the electromagnetic relay is increased. I will not let you.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is an exploded perspective view of an electromagnetic relay according to the present invention. The electromagnetic relay 1 includes a cover 2 and a relay block 10. The relay block 10 is covered with the cover 2. Cover 2 is a relay block 1
Covering 0 from above protects the components that make up the relay block 10 and also serves as a stopper to prevent the removal of these components.

FIG. 2 is an exploded perspective view of the relay block of the electromagnetic relay according to the present invention. The relay block 10 presses the hinge spring 12 into the resin body 11 from the lateral direction, inserts the driving piece 13 into the body 11 from the lateral direction, places the armature 14 on the body 11, and places the armature 14 on the body 11 from the lateral direction. The contact spring 15 is press-fitted, the contact terminal plate 16 is press-fitted into the body 11 from the lateral direction, and the electromagnet 17 is inserted into the body 11 from the lateral direction.
Is press-fitted and assembled. The assembled view is shown in FIG. The switch mechanism 18 includes a contact spring 15 and a contact terminal plate 16 with which the contact spring 15 contacts.

The body 11 has a lateral groove (not shown) for press-fitting the hinge spring 12, lateral grooves 11b and 11c for inserting the driving piece 13, a lateral groove 11d for press-fitting the contact spring 15, and a contact terminal. Transverse groove 1 for press-fitting plate 16
1e, a lateral groove 11f for press-fitting the electromagnet 17 and a projection 11g for holding the electromagnet 17 are provided. The hinge spring 12 includes a press-fitting portion 12a for press-fitting the body 11, an operating portion 12b extending laterally from the press-fitting portion 12a and bent into an L-shape, and an impact buffer spring 19 extending from the operating portion 12b.

The driving piece 13 includes a slide portion 13a having a planar shape as viewed in the drawing, and a stopper portion 13b projecting vertically from the center of the slide portion 13a. The armature 14 has one end 14 a for facing one end of the electromagnet 17, the other end 14 b for facing the drive piece 13 bent from the one end 14 a into an L shape, and one end 14 a of these. The other end 1
4b, and a hole 14d for penetrating the shock absorbing spring 19.

The contact spring 15 includes a press-fit portion 15a for press-fitting the body 11, a terminal portion 15b extending downward from the press-fit portion 15a, and a contact portion 15c extending upward from the press-fit portion 15a. The contact terminal plate 16 includes a press-fit portion 16a for press-fitting the body 11, a terminal portion 16b extending downward from the press-fit portion 16a, and a contact portion 16c extending upward from the press-fit portion 16a.

FIG. 3 is an exploded perspective view of the electromagnet of the electromagnetic relay according to the present invention. The electromagnet 17 includes an exciting coil 21,
An iron core 22 penetrates the center of the exciting coil 21 and a yoke 23 connected to one end of the iron core 22. The excitation coil 21 includes a bobbin 25 and a winding 26 wound around the bobbin 25. The bobbin 25 is connected to pin terminals 25a and 25a.
a and a recess 25 b for holding the yoke 23.

The iron core 22 includes a cylindrical body 22a and an adsorbing portion 22b for adsorbing the armature 14 (see FIG. 2) provided at one end of the body 22a. The yoke 23 includes a flange 23b having a fitting hole 23a and a flange 2b.
The holding portion 23c is bent from 3b into an L shape and extends vertically, and the holding portion 23c has a fulcrum 23d.

FIG. 4 is a perspective view showing the positional relationship between the hinge spring and the iron core of the electromagnetic relay according to the present invention. The shock absorbing spring 19 includes a support portion 19a provided at the tip of the action portion 12b of the hinge spring 12, and a spring portion 19 provided on the support portion 19a.
b, 19b. A spring portion 1 extending in a forked shape from the support portion 19a on the outer periphery of the suction portion 22b of the iron core 22
9b, 19b, and these spring portions 19b, 19b
Facing one end 14a of the armature 14. Therefore, one end 14a of the armature 14 and the attraction portion 2 of the iron core 22
2b.

The operation of the above-described electromagnetic relay 1 will now be described. FIGS. 5A and 5B are first operation explanatory diagrams of the electromagnetic relay according to the present invention. (A) shows a cross section of the electromagnetic relay 1 before the excitation coil 21 is energized. A stroke S (hereinafter, abbreviated as "stroke S") until one end 14a of the armature 14 moves to the suction portion 22b of the iron core 22.
Indicates that there is a predetermined interval, indicates that the contact spring 15 of the switch mechanism 18 and the contact terminal plate 16 are separated, and the electromagnetic relay 1 is open. One end 14 of the armature 14
This shows that there is a predetermined space between the spring a and the spring portion 19b of the shock absorbing spring 19.

FIG. 2B shows a cross section of the electromagnetic relay 1 after the excitation coil 21 is energized. One end 14a of the armature 14 is attracted to the attracting portion 22b of the iron core 22 as shown by the arrow, and the driving piece 13 is moved by the other end 14b of the armature 14 as shown by the arrow. The contact terminal plate 16 is brought into contact with the electromagnetic relay 1 to turn on. One end 14a of the armature 14 is
The 9 spring portion 19b is pushed up as shown by the arrow, indicating that the dump has been performed.

FIG. 6 is a view for explaining a second operation of the electromagnetic relay according to the present invention. The horizontal axis represents the stroke S, the vertical axis represents the spring load or the attractive force of the electromagnet, and the attractive force characteristic curve P represents the excitation coil 21. Represents a relationship between the stroke S and a stroke S when a constant voltage is applied to the contact spring 15. A spring load characteristic straight line R represents the relationship between the stroke S and the spring loads of the contact spring 15 and the shock absorbing spring 19 of the switch mechanism 18. It is a representation.
(A) to (d) show the relationship between the opening and closing state of the switch mechanism 18 and the stroke S at each point, and the relationship between the shock absorbing spring 19 and the stroke S. In the graph, R1
R3 are spring load characteristics corresponding to the stroke S1 to S3 sections. In order for the electromagnetic relay 1 (see FIG. 1) to operate without any trouble, the spring load characteristic line R needs to be within the range of the attractive force characteristic curve P.

2A shows the state of the switch mechanism 18, the stroke S of the armature 14, and the state of the shock absorbing spring 19 before applying a voltage to the exciting coil 21. The switch mechanism 18 is open, and the stroke S of the armature 14 is S1 + S2 +
S3, indicating that the shock absorbing spring 19 has not yet been operated. (B), a voltage is applied to the exciting coil 21, the contact spring 15 of the switch mechanism 18 contacts the contact terminal plate 16,
The stroke S of the armature 14 is S2 + S3, indicating that the armature 14 has not yet hit the shock absorbing spring 19.
(C), the contact pressure between the contact spring 15 of the switch mechanism 18 and the contact terminal plate 16 increases, and the stroke S of the armature 14 is increased.
Is S3, the armature 14 hits the shock absorbing spring 19,
This indicates that the impact buffer spring 19 has begun to work. (D)
This indicates that the ON operation of the switch mechanism 18 has been completed. One end 14a of the armature 14 contacts the attraction surface 22b of the iron core 22, and the shock absorbing spring 19 indicates that the movement of the one end 14a of the armature 14 has been dumped.

Next, the spring load characteristics R1 to R3 in the sections of the strokes S1 to S3 will be described with reference to a graph. The spring load characteristic R1 in the stroke S1 is a load characteristic of the contact spring 15, and is a straight line having a gentle slope. The spring load characteristic R2 in the stroke S2 is a load characteristic obtained by adding the resistance of the contact terminal plate 16 to the load characteristic of the contact spring 15, and is a straight line having a steep slope. The spring load characteristic R3 in the stroke S3 is obtained by adding the load characteristic of the shock absorbing spring 19 to the sum of the load characteristic of the contact spring 15 and the drag of the contact terminal plate 16, and is a straight line having a steeper slope.
When there is no impact buffer spring 19, the spring load characteristic R2 is extended as shown by the broken line.

Since the spring load characteristic line R obtained by adding the load of the shock absorbing spring 19 to the load of the switch mechanism 18 within the range of the initially defined attractive force characteristic curve P, there is no need to newly set the attractive force characteristic. . Therefore, the impact buffer spring 19 can be added without increasing the sensing voltage of the electromagnetic relay 1 (see FIG. 1), and the impact on the iron core 22 can be reduced.

In this embodiment, the armature is provided with a hole for penetrating the shock absorbing spring. However, the present invention is not limited to the hole for penetrating, and may be a notch.

[0026]

According to the present invention, the following effects are exhibited by the above configuration. In the first aspect, a fulcrum provided on the yoke of the electromagnet is substantially L-shaped.
Touch the valley of the U-shaped armature, push the armature toward the fulcrum with a hinge spring, make one end of the armature face the iron core of the electromagnet, make the other end of the armature face the switch mechanism, In an electromagnetic relay of the type in which the armature is swung by the suction action of the core and the switch mechanism is pressed by this armature, an impact buffer spring that acts to reduce the impact on the iron core by suppressing the armature facing the iron core from the middle Was extended from the hinge spring to form an electromagnetic relay. Since the hinge spring and the shock absorbing spring are integrated, the number of parts can be reduced and the assemblability can be improved.

A second aspect of the present invention is characterized in that the armature is provided with a hole or a notch for allowing an impact spring to pass therethrough. Since the armature is provided with a hole or a notch for penetrating the shock absorbing spring, it is not necessary to dispose the shock absorbing spring so as to be bypassed, and the shock absorbing spring can be formed in a simple shape.

According to a third aspect of the present invention, the distance between the armature and the iron core is plotted on the horizontal axis, and the attractive force of the electromagnet is plotted on the vertical axis, and a hyperbolic attractive force characteristic curve is drawn on the graph. When a spring load characteristic line is drawn on a graph with the spring load as the vertical axis, the spring load characteristic line to which the shock absorbing spring is added is within the range of the suction force characteristic curve before the shock absorbing spring is extended from the hinge spring. Therefore, even if an impact buffer spring is added, the sensing voltage of the electromagnetic relay does not increase.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay according to the present invention.

FIG. 2 is an exploded perspective view of a relay block of the electromagnetic relay according to the present invention.

FIG. 3 is an exploded perspective view of an electromagnet of the electromagnetic relay according to the present invention.

FIG. 4 is a perspective view showing a relationship between a hinge spring and an iron core of the electromagnetic relay according to the present invention.

FIG. 5 is an explanatory view of a first operation of the electromagnetic relay according to the present invention.

FIG. 6 is a diagram illustrating a second operation of the electromagnetic relay according to the present invention.

FIG. 7 is a cross-sectional view of a conventional electromagnetic relay.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic relay, 12 ... Hinge spring, 14 ... Armature, 1
4a: one end, 14b: other end, 14c: valley, 14d
... hole, 17 ... electromagnet, 18 ... switch mechanism, 19 ... impact buffer spring, 22 ... iron core, 23 ... yoke, 23d ... fulcrum, P
… Suction force characteristic curve, R… spring load characteristic line.

Claims (3)

[Claims] A valley of an approximately L-shaped armature is applied to a fulcrum provided on a yoke of an electromagnet, and the armature is pushed toward the fulcrum by a hinge spring, and one end of the armature is attached to an iron core of the electromagnet. With the other end of the armature facing the switch mechanism, the armature is swung by the attraction of the iron core and the switch mechanism is pushed by this armature. An electromagnetic relay, wherein an impact buffering spring that acts to reduce the impact on the iron core by suppressing the impact from the hinge spring extends from the hinge spring. 2. The electromagnetic relay according to claim 1, wherein the armature has a hole or a cutout for penetrating the shock absorbing spring. 3. A hyperbolic attractive force characteristic curve is drawn on a graph in which the horizontal axis represents the distance between the armature and the iron core, and the vertical axis represents the attractive force of the electromagnet. When a spring load characteristic straight line is drawn on a graph with respect to the vertical axis, the spring load characteristic line to which the shock absorbing spring is added is within the range of the suction force characteristic curve before extending the shock absorbing spring from the hinge spring. The electromagnetic relay according to claim 1, wherein: