JP3360593B2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay for opening and closing an electric circuit by moving a movable contact by an electromagnetic force.

[0002]

2. Description of the Related Art A yoke and terminals constituting an electric circuit in an electromagnetic relay are usually joined by resistance welding. By the way, as is well known, resistance welding is a method in which a current is intensively applied to a portion to be welded to locally melt an object to be welded and perform welding. For this reason, when the contact state between the welding objects such as the contact surface pressure and the contact area fluctuates, the electric resistance of the contact portion fluctuates in conjunction therewith, so that the welding state varies and the welding yield decreases.

[0003] Then, as shown in FIG.
The terminal 121 is formed with a spherical protrusion 121c protruding toward the yoke 111 to concentrate current on the protrusion 121c, and a part of the rolled plate-like yoke 111 is bent to be parallel to the terminal 121. By forming the flat portion 111b and bringing the projection 121c into contact with the flat portion 111b, the contact state is stabilized.

[0004]

However, in the above-mentioned means, since the flat portion 111b is formed by bending a part of the yoke 111, the size of the flat portion 111b is D and the size of the electromagnetic relay is increased. I will. Therefore, the inventors abolished the flat portion 111b and provided the terminal 121 on the end face of the yoke 111.
After examining the means of resistance welding of
It has been discovered that the welding yield is reduced for the following reasons.

That is, the yoke 111 is usually formed by punching or shearing with a press in consideration of productivity, and the cut surface 111a of the yoke 111 is used as it is.
1 is the end face. Therefore, the cut surface 1 of the yoke
As shown in FIG. 9, 11a has a shear surface (portion where a vertical line is drawn) sheared substantially perpendicular to the rolling surface, and a fracture surface (vertical line is broken) to be inclined with respect to the rolling surface. (Not drawn).

On the other hand, since the projection 121c of the terminal 121 is formed in a spherical shape, before welding the yoke 111 and the terminal 121, the two parts 111 and 121 are fixed to the base 1 by a jig.
If the position of the terminal 121 with respect to the yoke 111 is displaced even by a small dimension (dimension smaller than the thickness t of the yoke 111) when being fixed to the yoke 40 (see FIG. 1), the protrusion 12
A state where 1c contacts only the shear surface and a state where it contacts only the fractured surface occur. For this reason,
Since the contact state between the yoke 111 and the terminal 121 becomes unstable, the welding yield decreases.

[0007] In view of the above, it is an object of the present invention to reduce the size of an electromagnetic relay without lowering the welding yield.

[0008]

The present invention uses the following technical means to achieve the above object. Claim 1
According to the invention described in Item 4, the first conductive member (1) is provided at a welding portion of the second conductive member (121) with the cut surface (111a).
11) extends over the entire area in the thickness (t) direction and has a smaller cross-sectional area than other portions (12).
1a, 121b) are formed.

As a result, the joints (121a, 121a
Since any part of b) always contacts the shear surface, it is possible to prevent the protrusion (121c) from contacting only the fractured surface as described above. Therefore, the contact state between the two conductive members (111, 121) can be stabilized, and the welding yield can be improved.

As described above, according to the present invention, a part of the first conductive member (111) is bent to form the flat portion (11).
Since the second conductive member (121) can be resistance-welded to the cut surface (111a) of the first conductive member (111) without forming 1b), the welding yield can be reduced while reducing the size of the electromagnetic relay. Can be improved. Claim 2
In the invention described in (1), the extension length (L) of the joints (121a, 121b) is determined by the thickness (t) of the first conductive member (111).
It is characterized by being larger.

As a result, the joints (121a, 121a
The first conductive member (111) and the second conductive member (121) can reliably contact the b) and the shear surface.
Contact state can be further stabilized, and the welding yield can be further improved. The joint is
As described in claim 3, the protrusion may be formed by a ridge (121a) projecting toward the cut surface (111a).

Further, as described in claim 4, the first conductive member (111) is connected to the movable contact (132) side and the second conductive member (111) is connected to the second conductive member (132).
The conductive member (121) may be connected to the external electric circuit side. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0013]

FIG. 1 is a front view of an electromagnetic relay 100 according to the present embodiment. Reference numeral 110 denotes an exciting coil (hereinafter, abbreviated as a coil) that generates a magnetic field when energized. Reference numeral 111 denotes a magnetic path (yoke, yoke) for the magnetic flux induced by the coil 110 and a stationary plate (first conductive member) connected to an external electric circuit via a first terminal (second conductive member) 121. Member).
A stationary plate (hereinafter, abbreviated as a plate) 111 is an iron-based metal, a terminal 121 is a copper-based metal, and both 111 and 121 are formed by punching with a press and then joined by resistance welding. Have been.

Reference numeral 112 denotes a plate armature (hereinafter abbreviated as armature) which is swingably connected to the plate 111 and which is movable by an electromagnetic force generated by energizing the coil 110. An elastic force toward the first fixed contact (break contact) 131 is applied to the armature 112 and the plate 111
It is a leaf spring made of a conductive metal such as copper which also serves as an electric circuit from the movable contact 132 to the movable contact 132.

Reference numeral 133 denotes a second fixed contact (make contact). When the coil 110 is in a non-energized state,
When the first fixed contact 131 and the movable contact 132 come into contact with each other by the elastic force of the leaf spring 113 and the coil 110 is energized, the second fixed contact 133 and the movable contact 132
Is in contact with In FIG. 2, reference numeral 122 denotes a second fixed contact 1.
33 is a terminal connected to the first fixed contact 1
Reference numeral 31 denotes a terminal connected to the terminal 31, and reference numeral 124 denotes a terminal for supplying current to the coil 110.

As shown in FIG. 3, the terminal 121 is resistance-welded to the cut surface 111a of the plate 111, and a portion of the terminal 121 welded to the cut surface 111a covers the entire area of the plate 111 in the thickness t direction. A ridge (joining portion) 121a extending across and projecting toward the cut surface 111 is integrally formed by pressing. Also,
In the present embodiment, the extension length L of the protrusion 121a is set to be 1.2 times or more the thickness t (L ≧ 1.2t) in order to make the extension length L larger than the thickness t of the plate 111.

The vertical line of the cut surface 111a indicates a shear plane, and the non-vertical line indicates a fractured surface. Next, features of the present embodiment will be described. Since the ridge 121a extends over the entire area of the plate 111 in the thickness t direction, any part of the ridge 121a always contacts the shear surface. Therefore, as described above, the protrusion can be prevented from contacting only the fractured surface, so that the contact state between the plate 111 and the terminal 121 can be stabilized, and the welding yield can be improved.

As described above, according to the present embodiment, the terminal 121 is connected to the cut surface 11 of the plate 111 without bending a portion of the plate 111 to form a flat portion.
1a can be resistance-welded to the electromagnetic relay 1
Thus, it is possible to improve the welding yield while reducing the size of the P.00. Also, since the flat part can be abolished,
The material cost and the number of manufacturing steps of the plate 111 can be reduced, and the manufacturing cost of the electromagnetic relay 100 can be reduced.

By the way, as is clear from the above description, it is sufficient that the extension length L is equal to or greater than the thickness t of the plate 111 in order to bring the protrusion 121a into contact with the shear surface of the cut surface 111a. However, the plate 111 and the terminal 12
1 is set in a welding machine (not shown), the extension length L of the ridge 121 a with respect to the thickness t direction of the plate 111.
The directions do not always match (become parallel). For this reason, when the extension length L is the same as the thickness t when the extension length L direction is inclined with respect to the thickness t direction or when the terminal 121 is shifted in the thickness t direction,
May become unstable.

On the other hand, in the present embodiment, the extension length L
Is larger than the thickness t, so that even when the extension length L direction is inclined or deviated with respect to the thickness t direction, the ridge 121a and the shear surface can be reliably brought into contact ( (See FIG. 4). Therefore, the contact state between the plate 111 and the terminal 121 can be further stabilized, so that the welding yield can be further improved.

By the way, in the above embodiment, the ridge 12
Although the cross-sectional shape of 1a is an arc shape (circular shape), the present invention is not limited to this, and other shapes such as a V-shape may be used as shown in FIG. In the above-described embodiment, the ridge 12 is formed on the plate-shaped terminal 121 by pressing.
6 and 7, instead of the ridge 121a, as shown in FIGS. 6 and 7, the terminal 121a extends over the entire area in the thickness t direction of the plate 111 to the welding portion with the cut surface 111a. A joining portion 121b having a smaller sectional area than that of the portion may be provided. In addition, in FIG.
The cross-sectional shape of 21b is rectangular, and in FIG.
Has a circular cross section.

[Brief description of the drawings]

FIG. 1 is a front view of an electromagnetic relay.

FIG. 2 is a bottom view of the electromagnetic relay.

FIG. 3 is a perspective view showing a welding state between the stationary plate and the terminal.

FIG. 4 is a front view showing a welding state between the stationary plate and the terminal.

FIG. 5 is a perspective view showing a welding state of a stationary plate and a terminal according to a modification.

FIG. 6 is a perspective view showing a welding state of a stationary plate and a terminal according to a modification.

FIG. 7 is a perspective view illustrating a welding state of a stationary plate and a terminal according to a modification.

FIG. 8 is a perspective view showing a welding state of a yoke and a terminal according to a conventional technique.

FIG. 9 is a front view showing a welding state of a yoke and a terminal according to a conventional technique.

[Explanation of symbols]

111 ... stationary plate (first conductive member), 1
11a: cut surface, 121: terminal (second conductive member), 12
1a: ridge (joint).

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-314353 (JP, A) JP-A-7-214333 (JP, A) JP-A-5-234657 (JP, A) JP-A-6-314657 20756 (JP, A) Japanese Utility Model Showa 58-107284 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 11/00 H01H 50/14 B23K 101: 36

Claims (4)

(57) [Claims] 1. An electromagnetic relay for connecting and disconnecting an electric circuit, the electromagnetic relay having first and second conductive members (111, 121) constituting a part of an electric circuit, wherein the first conductive member (111) is a plate. The second conductive member (121) is formed by cutting a shaped member.
1) is resistance-welded to the cut surface (111a). Further, the second conductive member (121) is welded to the cut surface (111a) in the first conductive member (1).
11) extends over the entire area in the thickness (t) direction and has a smaller cross-sectional area than other portions (12).
1a and 121b) are formed. 2. The electromagnetic relay according to claim 1, wherein an extension length (L) of the joint (121a, 121b) is larger than a thickness (t) of the first conductive member (111). . 3. The joining section is connected to the cut surface (111a).
The electromagnetic relay according to claim 1, wherein the electromagnetic relay is formed by a ridge projecting toward a side. 4. The first conductive member (111) is connected to a movable contact (132) side, and the second conductive member (121) is connected to an external electric circuit side. 3. The electromagnetic relay according to any one of 3.