JP2698465B2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic relay.

[Conventional technology]

FIG. 6 shows a first conventional example. That is, the electromagnetic relay includes a leaf spring 52 having a fixed contact 50 and a movable contact 51 opposed to the fixed contact 50 at a distal end and having a fixed base end.
And an electromagnet 54 having a movable portion 53 that engages with the leaf spring 52.
And The movable part 53 is moved to the shaft 55 by the operation of the electromagnet 54.
And the plate spring 52 is opened and closed.

FIG. 8 shows a second conventional example. That is, the electromagnetic relay is configured such that the contact driver 56 engaged with the leaf spring 52 is
Movably provided in the opening / closing direction, and the end of the contact driver 56 is in contact with the side of the movable part 53. The rotation of the movable part 53 moves the contact driving body 56, so that the leaf spring 52 opens and closes.

[Problems to be solved by the invention]

In the first conventional example, since the movable portion 53 of the electromagnet 54 rotates around the shaft 55, the spring engagement portions 53a and 53b of the movable portion 53 are provided.
Is displaced from position A1 to B1 and from position A2 to B2 as shown in FIG. Although the length between A1 and B1 and the length between positions A1 and B2 are almost the same displacement because the angle θ is the same, the spring engagement part
The displacement amounts X ₁ and X ₂ of the leaf spring 52 at the positions of 53a and 53b are different because the distance from the shaft 55 to the spring engaging portions 53a and 53b is different. Therefore, when the fixed contact 50, the movable contact 51 and the leaf spring 52 constituting the contact block are made of the same component, the movable contact 51
There is a disadvantage that the contact specifications (stroke, contact gap, contact pushing amount) are different. In other words, in order to make the contact specifications of the pair of movable contacts 51 the same, two types of fixed contacts 50, movable contacts 51, and leaf springs 52 are required.

On the other hand, a second conventional example is shown in FIG.
When the displacement X ₀ in the region A4-B4 predetermined stroke, the displacement X ₃ at the position A3-B3 for driving the contact driving member 56 of the electromagnet 54 is _{X 3 ≒ X 0 × l 3} / l 0. l ₀ and l ₃ are at position A4 from axis 55
And the distance to the position A3 in the same direction. Since the contact driver 56 is displaced in the contact opening / closing direction, the spring engagement portions 56a,
The displacement X ₁ , X ₂ of 56b is equal to the displacement X ₃ and therefore the movable contact
The stroke of 51 is X ≒ X ₃ × l ₅ / l ₄ ≒ X ₀ (l ₃ / l ₀ ) × (l ₅ / l
₄ ) P is the fulcrum of the leaf spring 52, l ₄ is the distance of the fulcrum portion P to the spring engaging portion 56a, the distance to 56b, l ₅ from the fulcrum P to the position C1, C2 of the movable contact 51. Here, when the contact stroke is increased by changing the contact specification, if the electromagnet 54 and the contact block 52 are not changed, X ₀ , l
_0, l ₅ is a constant value, also a spring engaging portion 56a in order to avoid changing the performance of such contact bounce, the position of 56b also becomes constant value l ₄ When not changed, therefore the contact stroke X For example, to increase it, l ₃ needs to be increased. However, the range can be increased l ₃ As can be seen from FIG. 8 is a drawback that the range can be increased contact stroke narrower narrowed. Also, when positioning the contact driver 56, if a guide is provided on the body 57,
A clearance is required between the contact driver 56 and the guide to reduce friction.
Variations in l ₃ and l ₄ increase, resulting in variations in contact strokes, contact gaps, etc., and there is a disadvantage that the contact driver 56 is easily inclined and the two sets of contact specifications become unbalanced. .

Therefore, an object of the present invention is to provide an electromagnetic relay capable of expanding the range of change of the contact specifications, stabilizing the contact performance, and using the same contact block with the same contact performance when using a pair of contact blocks. It is to provide.

[Means for solving the problem]

The electromagnetic relay of the present invention has a fixed contact, a leaf spring having a movable contact opposed to the fixed contact at a distal end and having a fixed base end, and a spring engaging portion engaged with the leaf spring. A contact driver that has an electromagnet engagement receiving portion and is supported by a shaft, and a movable shaft that engages with the electromagnet engagement receiving portion to open and close the leaf spring via the contact driver. And an electromagnet having a portion.

[Action]

According to the configuration of the present invention, the operation of the movable part of the electromagnet causes the contact driver to rotate about the axis, drive the leaf spring via the spring engaging part, and move the movable contact of the leaf spring with respect to the fixed contact. Contact. In this case, by moving the contact driver in the direction along the leaf spring, the contact specifications such as contact stroke, contact gap and contact pressure can be changed without changing the contact block including the electromagnet, fixed contact, movable contact and leaf spring. Can be changed. In addition, since the contact driver rotates about the shaft, the range of changing the contact specifications can be expanded as compared with the conventional example, and stable contact performance can be secured. Further, in the case where there is a pair of contact blocks having movable contacts, the displacement amount of the movable contacts can be made the same by disposing the axis of the contact driver between the contact blocks. The contact specifications can be made the same, and mutual variations can be reduced.

〔Example〕

A first embodiment of the present invention will be described with reference to FIGS. That is, the electromagnetic relay includes the fixed contact 1, the leaf spring 2, the contact driver 3, and the electromagnet 4.

The fixed contacts 1 have a pair in the embodiment, and are provided on fixed-side terminal plates 8 and 9 that are fixed to the mounting holes 6 and 7 of the body 5.

The leaf spring 2 has a movable contact 10 facing the fixed contact 1 at a distal end, and a base end is fixed. In this embodiment, the ends of the leaf springs 2 are fixed by caulking pins to the movable side terminal plates 13 and 14 penetrated through the mounting holes 11 and 12 of the body 5, respectively. It is stuck.

The contact driver 3 has a spring engagement portion 15 that engages with the leaf spring 2, has an electromagnet engagement receiving portion 16, and is supported on the body 5 by a shaft 31. In the embodiment, the spring engaging portion 15 has a groove to be fitted to the leaf spring 2, and the electromagnet engagement receiving portion 16 has a long hole parallel to the leaf spring in the embodiment.

The electromagnet 4 has a movable portion 17 that engages with the electromagnet engagement receiving portion 16 to open and close the leaf spring 2 via the contact driver 3. The electromagnet 4 of the embodiment has a coil 18 as shown in FIG.
Frame 20 provided with coil terminals 19, and a coil frame
A magnetic plate 21 penetrated by 20, a yoke 22 disposed outside the coil frame 20, and a movable portion 17 having a shaft 24 supported at one end by a shaft hole 23 formed in the coil frame 20. Become. Magnetic plate
Reference numeral 21 denotes a flat T-shape, and one end of the yoke 22 is bent vertically, and the other end of the yoke 22 is bent vertically in the same direction to form vertical pieces 25 to 27, respectively. The fitting protrusion 29 of the magnetic plate 21 is fitted into the hole 28 of the vertical piece 25, and the wide portion 30 at the other end is located between the vertical pieces 26 and 27. The movable part 17 is located between the vertical pieces 26 and 27 of the yoke 22 on the side opposite to the shaft 24. A pair of magnetic pieces 31 'and 32 is provided in this portion, and the bistable between the magnetic pieces 31' and 32. A permanent magnet 32 for
The wide portion 30 of the magnetic plate 21 is engaged with the movable portion 17 between 1 'and 32. The movable part 17 has a driving piece 34 protruding from one side of the intermediate part, and a shaft part 35 is provided at the tip thereof.
Are fitted to the electromagnet engagement receiving portions 16. Further, an auxiliary driving piece 36 is provided on the opposite side of the driving piece 34 in the middle part of the movable portion 17.
An auxiliary contact portion 37 is provided on the body 5 corresponding to the auxiliary drive piece 36.

The electromagnet 4 is configured such that the movable part 17 is rotated about the shaft 24 to the position shown in FIG. 1 by applying a current to the coil 18 in one direction. To rotate. The shaft portion of the driving piece 34 by the rotation of the movable portion 17
35 pushes the side surface of the long hole which is the electromagnet engagement receiving portion 16, and the contact driver 3 rotates around the shaft 31, thereby displacing the leaf spring 2 and opening and closing the movable contact 10 with respect to the fixed contact 1. Let it.

 38 is a case.

FIG. 3 is an explanatory diagram for explaining a stroke of the movable contact 10 with respect to a stroke of the movable portion 17. That is, the movable part 17
At a distance l ₀ from the axis 24 by the rotation of the rotation angle theta ₁ of A0-B0
And stroke X ₀ in the shaft portion of the drive pieces 34 of the electromagnet 4
The displacement X ₃ ≒ X ₀ × l ₃ / l ₀ with respect to the movement amount A3-B3 of 35. l
₃ is the distance of the distance l ₀ parallel to the direction from the axis 24 to the shank 35. Contact driving member 3 by the displacement l ₃ is shaft 31 centered on an angle rotation of theta ₂ and produces a displacement of the displacement A1-B1, and A2-B2 of the spring engaging portion 15. The displacement amounts X ₁ and X ₂ of the leaf spring 2 in these spring engaging portions 15 are X ₁ ≒ X ₃ × l ₁ / l ₂ and X ₂ ≒ X ₃
× l ₁ / l ₂ . l ₂ is the distance from the axis 31 to the electromagnet engagement receiving portion 16, l ₁ is the distance to the shaft 31 to the spring engagement portion 15. Therefore, the contact stroke of the movable contact 10 at the contact positions C1 and C2 is X ≒ X ₁ × l ₅ / l ₄ = X ₀ × (l ₃ / l ₀ ) × (l ₁ / l ₂ ) × (l ₅ / l ₄ )
It is represented by l ₄ is the fulcrum portion P of the leaf spring 2 to the spring engagement portion 15
The distance to, l ₅ is the distance from the fulcrum P of the leaf spring 2 to the position C1, C2 of the movable contact 10.

Here, without changing the contact block including the electromagnet 4 and the fixed contact 1, the leaf spring 2, and the movable contact 10, that is, l ₀ , l _{3 to} l ₅ are constant, and the position of the shaft 31 of the contact driving body 3 is When the direction is changed in the direction of the arrow in FIG. 3, that is, when the value of l ₁ / l ₂ is changed, the displacement X of the movable contact 10 changes according to the above equation, so the contact specifications, ie, the contact stroke, the contact gap, and the contact pressure are changed. can do. That is, by moving the contact driver 3 in the direction along the leaf spring 2, the contact specifications can be changed without changing the electromagnet 4 or the contact block.
In addition, since the contact driver 3 rotates about the shaft 31, the range of changing the contact specifications can be expanded as compared with the conventional example, and stable contact performance can be secured.

Also, since the shaft 31 is located between the two sets of leaf springs 2,
The displacement of the leaf spring 2 of the contact driver 3 becomes equal, that is, X ₁
= X ₂ , it is possible to reduce the variation in the performance of two sets of contacts having the same structure.

FIGS. 4 and 5 show a second embodiment of the present invention. That is, in this electromagnetic relay, the electromagnet engagement receiving portion 16 is formed by a substantially L-shaped groove having both ends opened, and the driving piece 34 of the movable portion 17 of the electromagnet 4 is formed in a substantially L-shape. This is engaged with the electromagnet engagement receiving portion 16.

To change the contact specifications, only by changing the position of the shaft 31 of the contact driver 3, the driving piece 34
Can be engaged. Others are the same as the first embodiment.

〔The invention's effect〕

According to the electromagnetic relay of the present invention, since the contact driver is supported by the shaft, the contact driver is moved in the direction along the leaf spring to form a contact block comprising an electromagnet, a fixed contact, a movable contact, and a leaf spring. Contact specifications such as contact stroke, contact gap, and contact pressure can be changed without change. In addition, since the contact driver rotates about the shaft, the range of changing the contact specifications can be expanded as compared with the conventional example, and stable contact performance can be secured. Further, in the case where there is a pair of contact blocks having movable contacts, the displacement amount of the movable contacts can be made the same by disposing the axis of the contact driver between the contact blocks. There is an effect that the contact specifications can be made the same and mutual variation can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of the present invention without a case, FIG. 2 is an exploded perspective view thereof, FIG. 3 is an explanatory view of a stroke of a movable contact, FIG. FIG. 5 is a plan view of the embodiment excluding the case, FIG. 5 is a partial perspective view showing the relationship between the movable unit and the contact driver, FIG. 6 is a plan view of the first conventional example excluding the case, FIG. 7 is an explanatory view of a stroke of the movable portion, FIG. 8 is a plan view of the second conventional example without a case, and FIG. 9 is an explanatory view of a stroke of the movable portion. 1 ... fixed contact, 2 ... leaf spring, 3 ... contact driver, 4 ... electromagnet, 10 ... movable contact, 15 ... spring engaging part, 16 ... electromagnet engaging receiving part, 17 ... Movable part, 24, 31 ... axis

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroaki Hamaguchi 1048 Odakadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd. (56) References JP-A-61-151940 (JP, A) JP-A-2-114424 (JP, A) Actually open sho 59-9456 (JP, U)

Claims (1)

(57) [Claims] An electromagnet having a fixed contact, a leaf spring having a movable contact opposed to the fixed contact at a distal end and having a fixed base end, and a spring engaging portion engaging with the leaf spring. A contact driver having an engagement receiving portion and supported by a shaft, and a movable portion having a shaft that engages with the electromagnet engagement receiving portion and opens and closes the leaf spring via the contact driver. An electromagnetic relay having an electromagnet having the same.