JPH05250974A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To reduce defective products caused by a contact point gap by disposing fixed contact points in the approximately center at one surface, and providing, in a bobbin, fixed contact point plates each fixed at one end while movably disposed toward the other side at the other end. CONSTITUTION:Fixed contact point plates 3, 4 are disposed in a bobbin 1 in such a manner that each of fixed contact points 3a, 4a is formed in the approximately center of at least one of both plate thickness surfaces and that each one end 3b, 4b thereof is fixed while each of the other ends 3d, 4d restricts one direction of plate thickness directions for motion in the other direction. A position restricting dimension on one side is set at the minimum required value of a contact point gap in consideration to variation of members. Accordingly, if other performance such as an operating characteristic affected by the magnitude of the contact point gap is necessary to be satisfied, each of the other ends 3d, 4d of the plates 3, 4 is moved toward the other movable side so that the contact point gap can be adjusted in an increasing direction. Consequently, it is possible to secure the contact point gap and reduce defective products related to the gap.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to electromagnetic relays.

[0002]

2. Description of the Related Art As a conventional electromagnetic relay, FIGS.
There are those shown in.

A bobbin A is made of an insulating material such as a synthetic resin and has a collar portion at both ends of a winding body portion around which the coil B is wound. The outside of the flange portion A ₁ of the one extending the thick portion A _2, A ₃ facing, mutually parallel straddling between the thick portion in the thick portion A _2, A ₃ Two through-grooves A ₄ and A ₅
And A ₆ and A ₇ , respectively.

C and D are two fixed contact plates, which are formed of a metal plate material such as brass and have a substantially flat plate shape with a terminal portion for external connection. Fixed contacts C ₁ , D are located at the center of _{one surface} .
₁ is fixed, and projections C ₂ and D ₂ are provided on both ends of the other surface. Then, these two fixed contact plates C and D have projections C _{2 on the two} through grooves A ₄ and A ₅ and A ₆ and A ₇ of the bobbin A so that the fixed contacts C ₁ and D ₁ face each other. , D _{2 is} press-fitted and fixed. That is, both ends of the fixed contact plates C and D are fixed by the thick portions A ₂ and A ₃ of the bobbin A.

E is a movable spring, which is made of a leaf spring material such as phosphor bronze, and movable contacts E ₁ are fixed to both surfaces thereof. In the movable spring E, the movable contact E ₁ has the fixed contacts C ₁ , D ₁
It is arranged so that it can be brought into and out of contact with and is excited, and when the coil B is excited, it is driven by the operation of an electromagnet (not shown).

[0006]

In the conventional electromagnetic relay described above, the two fixed contact plates C and D are fixed at both ends by the thick portions A ₂ and A ₃ of the bobbin A. Therefore, at the time of the fixing, the distance between the two, and further, the distance between the fixed contact C ₁ and the fixed contact D ₁ provided substantially in the center of each, and further, the movable contact E ₁ and the fixed contacts C ₁ , D ₁ The so-called contact gap between and will be fixed. However, these intervals are related to the dimensions of the bobbin A, the two fixed contact plates C and D, the fixed contacts C ₁ and D ₁ , the movable spring E, the movable contact E _{1, and the} like. If there are variations in the finished dimensions due to lots, deformation, etc., it may not be possible to secure the contact gap above the minimum required value among individual electromagnetic relays, or the operating characteristics that are affected by the size of the contact gap. Others may not be satisfied with other performances and may be defective.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic relay which reduces defective products related to a contact gap.

[0008]

In order to solve the above-mentioned problems, an electromagnetic relay according to the present invention has a bobbin around which a coil is wound and a fixed contact is provided at substantially the center of at least one of both sides of the plate thickness, and one end The fixed contact plate is fixed to the bobbin so that the other end of the bobbin can move only to the other side while the other end regulates one side in the plate thickness direction. A movable spring that is driven when excited,
It is configured to have.

[0009]

According to the electromagnetic relay of the present invention, the fixed contact plate is
A fixed contact is provided at substantially the center of at least one side of the plate thickness, and one end is fixed and the other end is arranged on the bobbin so as to regulate the position on one side in the plate thickness direction and to move only to the other side. Therefore, if the position regulation dimension provided on one side is set to be the minimum required value of the contact gap in consideration of the variation of each member, other characteristics such as operating characteristics that are affected by the size of the contact gap will be affected. If you want to satisfy the performance, you can adjust the contact gap in the direction of increasing by moving the other end of the fixed contact plate to the other movable side, thus ensuring the contact gap and related defective products. It can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a bobbin, which is made of an insulating material such as synthetic resin and has a collar portion at both ends of a winding body portion around which the coil 2 is wound, and one thick portion facing the outside of the one collar portion 1a. It is formed by extending 11,12. Two through-grooves 11a, 11b and 12a, 12b extending through the thick-walled portions 11 and 12 so as to extend between the thick-walled portions.
Are provided respectively.

More specifically, the through groove 11a of the thick portion 11 and the through groove 12a of the thick portion 12 are on the same surface extending over both through grooves.
In addition to having 11c and 12c, one through groove 11a is a groove with only one side having two steps with a narrow groove formed by the same surface 11c and a wide groove formed by one step extending on the opposite side of the coil 2. The other through groove 12a is a through groove formed by the same surface 12c.
The groove is wider on the coil 2 side than the narrow groove of 11a. Further, the through groove 11b of the thick portion 11 and the through groove 12b of the thick portion 12 are
It also has the same surfaces 11d and 12d straddling both through-grooves, and the shape of the groove is opposite to that of the above-mentioned through-grooves 11a and 12a.

Reference numerals 3 and 4 are two fixed contact plates, which are formed of a metal plate material such as brass and have a substantially flat plate shape with a terminal portion for external connection. Fixed contacts 3a and 4
a is fixed, and projections 3c and 4c are provided on the other ends 3b and 4b, respectively. The two fixed contact plates 3 and 4 have one end portions 3b and 4b protruding from the through groove 11a of the thick portion 11 and the through groove 12b of the thick portion 12 so that the fixed contacts 3a and 4a face each other. The 3c and 4c are press-fitted and fixed so that they are substantially located on the opposite side surfaces near the boundary between the two steps of the narrow groove and the wide groove. Then, the one surface of one end 3b, 4b is fixed in close contact with the same surface 11c of the through groove 11a and the same surface 12d of the through groove 12b, and from the vicinity of the protrusions 3c, 4c toward the fixed contacts 3a, 4a. Is a wide groove, a rotational moment acts on the fixed contacts 3a, 4a side with at least the step boundary of the wide groove as a fulcrum, and one surface side of the other ends 3d, 4d also has the same surface 12c of the through groove 12a. The position is regulated by closely adhering to the same surface 11d of the through groove 11b. Further, since the other end portions 3d, 4d have a wide groove space on the other side, they can move in that direction.

The above-mentioned same surfaces 11c and 12c and the same surfaces 11d and 12d are required to have a minimum distance between the fixed contacts 3a and 4a facing each other, and hence a contact gap described later, in consideration of the variation of each member related thereto. It is set to the value.

A movable spring 5 is made of a leaf spring material such as phosphor bronze, and movable contacts 5a are fixed to both surfaces thereof. In the movable spring 5, the movable contact 5a is fixed contacts 3a, 4a.
The movable contact 5a and the fixed contacts 3a, 4a are arranged between the fixed contacts 3a, 4a so as to be able to come into contact with and separate from the fixed contact 3a, 4a.

Reference numeral 6 denotes an electromagnet, which is an iron core 6a mounted in the axial direction of the bobbin 1 winding body, an L-shaped yoke 6b having one end fixed to the iron core 6a, and the other end of the yoke 6b. And an armature 6c which is rotatably supported by the armature and is sucked and released to the iron core 6a. Then, when the movable spring 5 is fixed to the armature 6c, the coil 2 is excited, and the armature 6c is sucked and released to the iron core 6a,
The movable spring 5 is driven so that the movable contact 5a comes into contact with and separates from the fixed contacts 3a, 4a.

After the above-mentioned members are led out of the external connection terminals and mounted on the base 7, the case 8 is replaced with the base 7.
The adhesive is applied to the external connection terminal portion and the fitting portion between the base 7 and the case 8 to hermetically seal them.

In such an electromagnetic relay, the two fixed contact plates 3 and 4 have the fixed contacts 3a and 4a substantially at the center of one surface thereof.
In addition, one end 3b, 4b has a thick portion 11 of the bobbin 1.
Of the through hole 11a and the through groove 12b of the thick portion 12 are press-fitted and fixed by the protrusions 3c and 4c, and the other ends 3d and 4d are formed on the one surface side of the through groove 12a.
The position is regulated in close contact with the same surface 12c of a and the same surface 11d of the through groove 11b, and there is a wide groove space on the other surface side for movement, and the position regulation provided on the one surface side. The dimensions are set so as to be the minimum required value of the contact gap in consideration of the variation of each member, so if you want to satisfy other performance such as operating characteristics affected by the size of the contact gap, As shown in 2, by moving the other ends 3d and 4d of the fixed contact plates 3 and 4 to the other movable side, the contact gap can be adjusted in the direction of increasing, thus ensuring the contact gap and The related defective products can be reduced.

Further, the fixed contact plates 3 and 4 are not fixed to the bobbin 1 by press-fitting both ends thereof as in the conventional example, but the one end portions 3b and 4b are not fixed.
Since only the bobbin 1 is press-fitted and fixed, the amount of molding powder generated by scraping the bobbin 1 is reduced, and the molding powder adheres to the suction surface and the contact surface of the armature 6c to the iron core 6a. As a result, malfunctions and poor contact are less likely to occur.

Further, the other end portion 4d of the fixed contact plate 4 is not press-fitted into the groove as in the conventional example, but a wide groove space exists on the other surface side, so that the base 7 and the case 8 are fitted together. When the adhesive is applied to the attachment portion and hermetically sealed, the adhesive is blocked by the space of the wide groove and hardly flows into the contact.

In this embodiment, the two fixed contact plates 3,
Although 4 is used, the number of the fixed contacts may be one, and the fixed contact is provided on one side of the both sides of the plate thickness, but it is needless to say that it may be provided on both sides.

[0022]

In the electromagnetic relay of the present invention, the fixed contact plate is
A fixed contact is provided at substantially the center of at least one side of the plate thickness, and one end is fixed and the other end is arranged on the bobbin so as to regulate the position on one side in the plate thickness direction and to move only to the other side. Therefore, if the position regulation dimension provided on one side is set to be the minimum required value of the contact gap in consideration of the variation of each member, other characteristics such as operating characteristics that are affected by the size of the contact gap will be affected. When the performance is desired to be satisfied, the other end of the fixed contact plate can be moved to the other movable side so that the contact gap can be adjusted in the increasing direction. Good products can be reduced.

[Brief description of drawings]

FIG. 1 is a bottom view of an essential part showing an embodiment of the present invention.

FIG. 2 is a bottom view of a main part showing a state when the contact gap is adjusted.

FIG. 3 is a front view showing the entire electromagnetic relay of the above.

FIG. 4 is an exploded perspective view of essential parts showing a conventional example.

FIG. 5 is a bottom view of the main part of the above.

[Explanation of symbols]

 1 bobbin 2 coil 3 fixed contact plate 3a fixed contact 3b one end 3d other end 4 fixed contact plate 4a fixed contact 4b one end 4d other end 5 movable spring 5a movable contact

Claims (1)

[Claims] 1. A bobbin around which a coil is wound, and a fixed contact is provided at substantially the center of at least one of both sides of the plate thickness, and one end is fixed and the other end regulates one side in the plate thickness direction and the other side. A fixed contact plate disposed on the bobbin so as to be movable only on the side, and a movable spring that is provided with a movable contact that comes in contact with and separates from the fixed contact and is driven when the coil is excited. relay.