JP3213980B2 - 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 a configuration of an electromagnetic relay for switching an amperage current, and more particularly to a characteristic as a relay by easily dissipating heat generated in a terminal portion when current is supplied by a conductor resistance of the terminal portion. The present invention relates to an electromagnetic relay that achieves improvement and stabilization to improve productivity.

In recent years, in the field of electromagnetic relays, there has been a strong demand for miniaturization, but in the field of high current electromagnetic relays for switching amperage currents, small ones are also desired.

In this case, as the current to be switched increases, the terminal portion serving as a path of the current is often heated by the conductor resistance, and as a result, the characteristics as a relay deteriorate or the characteristics become unstable. Therefore, the solution is strongly desired.

[0004]

2. Description of the Related Art FIG. 2 is a principle diagram showing an example of the configuration of a main part of a conventional electromagnetic relay. (2-1) is an overall configuration diagram, and (2-2) explains a main part involved in the present invention. FIG.

[0005] In the drawings, a single circuit relay will be described as an example for easy understanding. In FIG. 2, the main part 1 of an electromagnetic relay (hereinafter referred to as a relay at the end) is roughly composed of an electromagnet 2 and a contact spring set 3 operated by an attractive force generated in the electromagnet 2 when the electromagnet 2 is energized. Have been.

As shown in (2-2), the inner electromagnet 2 has a coil 22 wound on a bobbin 21 having substantially rectangular flanges 21a and 21b formed at both ends and a center axis of the coil 22. And a core 23 embedded at one end so as to protrude from one side (upper side in the figure) of the flange 21a so as to be exposed. Two cores (1 in the figure) for applying a current to the coil 22 are provided.
Of the bobbin 21 is disposed through the other (lower in the figure) flange 21b of the bobbin 21.

Therefore, by applying a required current to the external connection terminal 24 from the outside, a required suction force can be generated on the exposed end face 23a of the iron core 23. A block body 21a 'formed at two predetermined positions around the flange 21a of the bobbin 21 so as to protrude from an end side thereof is provided with a make contact terminal 34 and a break contact terminal 35 constituting a contact spring set 3 described later. Through holes 21a- ₁ and 21a- ₂ for inserting and fixing from the external connection terminal side are formed,
Recessed grooves 21b- ₁ and 21b- ₂ for fixing the make contact terminal and the break contact terminal in the width direction thereof are formed at positions corresponding to the respective through holes of the other flange 21b.

On the other hand, the contact spring set 3 is fixed to an end (not shown) of the iron core 23 by means such as caulking while maintaining electrical connection, and then bent at a substantially right angle to the exposed end face 23a. A yoke 31 having a common terminal 31a fixed to the flange 21b, and the exposed end face side edge 31
b so that the armature 32 located in contact with the arm 32 can rotate about the end 31b as an axis.
The movable contact spring 33 is disposed at a corresponding position on both sides in the moving direction (vertical direction in the figure) of the movable contact 33a, which is fixed to a predetermined position on the free end side of the movable contact spring 33 on both sides. A make contact terminal 34 having a make contact 34a and a break contact terminal 35 having a break contact 35a.

Incidentally, the make contact terminal 34 among them is (2-2)
As shown in the figure, the external connection terminal 34b is press-fitted into the through hole 21a- ₁ of the bobbin 21 constituting the electromagnet 2 from the side of the external connection terminal 34b as shown by an arrow a, and the vicinity of the external connection terminal 34b is recessed 21b- _1.
The break contact terminal 35 is positioned and fixed by the through-hole 21a- ₂ and the concave groove 21b- ₂ of the bobbin 21, similarly to the make contact terminal 34. Each through hole 21a- ₁ and concave groove 21b- ₁ and through hole 21a
The gap between the make contact 34a and the break contact 35a, which are fixed at predetermined positions on the respective free ends of the make contact terminal 34 and the break contact terminal 35, which are fixed by _-2 and the concave groove 21b _-2 , is a predetermined value. The free end side is bent so that δ is secured.

The movable contact 33a of the movable contact spring 33
When a current is not applied to the coil 22 described above, the movable contact 33a connected to the common terminal 31a contacts the break contact 35a due to the spring property of the movable contact spring 33,
When a predetermined current is applied to the coil 22 from the external connection terminal 24, the attractive force generated on the exposed end surface 23a side of the iron core 23 attracts the armature 32 against the spring property of the movable contact spring 33, so that the common terminal 31a Connectable movable contact 33a is a make contact
It moves to 34a and comes into contact with the make contact 34a.

Therefore, "connection between the common terminal 31a and the external connection terminal 35b of the break contact terminal 35" and "connection between the common terminal 31a and the external connection terminal 34b of the make contact terminal 34" depend on whether or not a current is applied to the coil 22. And a required electromagnetic relay in which the and are alternately switched.

[0012]

In such a relay, the switched current flows from the common terminal to the break contact terminal via the movable contact spring or from the common terminal to the make contact terminal via the movable contact spring. The current flow induces heat generation due to the conductor resistance. In particular, the generation of the heat increases as the flowing current increases.

Therefore, for example, in the case of a relay that flows a large current of several amperes or more, it is necessary to dissipate the generated heat by increasing the surface area of each terminal portion as much as possible. However, the conventional relay has a configuration in which the make contact terminal and the break contact terminal constituting the contact spring assembly are fixed by penetrating through the through holes provided in the flange of the bobbin from the respective external connection terminal sides. The width w of each terminal shown is regulated by the through hole.

This means that when used in a circuit in which a current that induces heat generation exceeding the amount of heat that can be dissipated in each terminal portion flows, each terminal portion is heated to deteriorate the characteristics of the relay or to stabilize the characteristics. Means impaired.

Therefore, there is a problem that the application range is limited and improvement in productivity cannot be expected.

[0016]

The above object is achieved by an electromagnet,
A space between two flanges formed on both end surfaces of the bobbin for winding the coil of the electromagnet is formed from both sides of each flange .
A make contact terminal and a break contact terminal, which are positioned and fixed around the flange by insertion, and at one end by the operation of the electromagnet
The provided movable contact is in front of the make contact of the make contact terminal.
Serial comprises a movable contact spring to be engaged with the flange so as to reciprocate between the break contact of the break contact terminals, each of the make contact terminal and break contact terminals, and between the two flanges Widened to the corresponding area
Do not have a heat sink that is bent in a “U” shape in cross section.
Ri, the heat radiating portion corresponding territory of the heat radiating portion on one side of the flange
This is achieved by an electromagnetic relay having a fixing projection which can be pressed into a square hole provided in the area .

[0017]

When the make contact terminal and the break contact terminal are fixed to the bobbin without penetrating the bobbin flange to form a relay, the width of the make contact terminal and the break contact terminal is increased to easily increase the surface area. Can be planned.

In the present invention, a make contact terminal and a break contact terminal are formed so that they can be positioned and clamped and fixed by the flanges at both ends of the bobbin, so that the width of each terminal is enlarged to constitute a relay.

Therefore, the applicable range can be extended to a large current region which cannot be used in the conventional relay,
Productivity can be improved.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining an example of the configuration of a main part of an electromagnetic relay according to the present invention. As in FIG. It is a figure explaining a main part.

In the figure, the case of an electromagnetic relay (hereinafter referred to as a relay) having the same configuration as that of FIG. 2 is taken as an example, and therefore the same target members as those of FIG. 2 are denoted by the same symbols. In FIG. 1, the main part 3 of the relay is composed of an electromagnet 4 having the same configuration as in FIG. 2 and a contact spring set 5 operated by an attractive force generated in the electromagnet 4 when the electromagnet 4 is energized.

As shown in (1-2), the inner electromagnet 4 has a coil 22 wound around a bobbin 41 having substantially rectangular flanges 41a and 41b formed at both ends, and a central axis of the coil 22. 2 and two external connection terminals 24 for applying a current to the coil 22 are provided on the lower side of the bobbin 41 as in FIG. Since a required current is applied to the external connection terminal 24, a required suction force is generated on the exposed end surface 23a of the iron core 23 as in the case of FIG. It is.

Note that the flange located above the bobbin 41 is
Pair with the two block bodies 21a 'described in FIG.
Each corresponding position has a block body 41a 'similar to FIG.
Are not shown in the figure.
Two square holes 41a_-1, 41a_-2(In the figure, 41a_-1Write only
And the other flange 41
b of FIG. 2_-1, 21b_-2At the position corresponding to
Groove 41b similar to_-1, 41b _-2Are formed.

On the other hand, the contact spring set 5 includes a yoke 31 fixed to the iron core 23 as in FIG. 2, a movable contact spring 33 for holding the armature 32 of FIG. 2 on the yoke 31, and a free contact of the movable contact spring 33. Make contact terminals 51 and break contacts 52 are formed such that make contacts 51a are located at corresponding positions on both sides of the movable contact 33a located at the end in the moving direction.
a break contact terminal 52 formed so that a is located
It is composed of

In particular, the make contact terminal 51 in this case is (1-
As shown in 2), a length region substantially equal to the distance d between the flanges 41a and 41b of the bobbin 41 in the middle portion in the longitudinal direction is formed as a heat radiating portion 51 'in which the widthwise protruding portion is bent in a U-shape. And one end in the longitudinal direction is
The make contact 51a is fixed to the back side of 1 'by approximately 90 ° to form a make contact 51a, and the other end is formed to an external connection terminal 51b.

The make contact terminal 51 is connected to the heat radiating section.
The fixing projections 51 ″ formed on the end faces on the make contact side of both wing faces facing 51 ′ are connected to the block body 4 of the bobbin 41 described above.
Pressing into the two square holes 41a- ₁ formed in 1a 'and fitting the straight portion coming off the heat radiating portion 51' into the concave groove 41b- ₁ of the flange 41b located below the bobbin 41 at the same time. Thus, the make contact terminal 51 can be fixed to the bobbin 41 as shown in (1-1).

As shown in (1-2), the break contact terminal 52 has a length substantially equal to the distance d between the flanges 41a and 41b of the bobbin 41 at the middle portion in the longitudinal direction, similarly to the make contact terminal 51. It has a U-shaped heat radiating portion 52 ', one end in the longitudinal direction is formed on the break contact side having the break contact 52a, and the other end is formed on the external connection terminal 52b.

Therefore, similarly to the make contact terminal 51, the fixing projection 52 "formed on the heat radiating portion 52 'is formed by two rectangular holes 41a (not shown) formed on the block 41a' of the bobbin 41. _As shown in (1-1), the break contact terminal 52 is bobbin as shown in (1-1) by fitting the straight part which comes out of the heat radiating part 52 'simultaneously with the press-fitting into the concave groove 41b- ₂ of the flange 41b of the bobbin 41. Can be fixed to 41.

The distance between the fixing protrusion 51 "of the heat radiating portion 51 'and the make contact 51a and the fixing protrusion of the heat radiating portion 52' are fixed.
By adjusting the distance from 52 ″ to the break contact 52a to a preset value, the contact interval δ described with reference to FIG. 2 can be secured.

Therefore, as in the case of FIG. 2, the "connection between the common terminal 31a and the external connection terminal 52b of the break contact terminal 52" and the "connection between the common terminal 31a and the make contact terminal 51" depend on whether or not a current is applied to the coil 22. And the connection between the connection terminals 51b can be alternately switched, so that a required magnetic relay can be configured.

In particular, in such a relay, the make contact terminal 51
And break contact terminal 52 both have heat radiating portions 51 'and 52', so that they can be used in circuits for switching larger currents than in the past, thereby improving productivity by expanding the applicable range. it can.

[0032]

As described above, according to the present invention, the above-described makeup
By to easily dissipate heat generated to the respective contact terminal areas when energized by a conductor resistance of each contact terminal and break contact terminals, stable expansion and JP <br/> and improving properties of the scope of the electromagnetic relay Thus, it is possible to provide an electromagnetic relay that realizes the improvement of the productivity by realizing the integration.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a main part of an electromagnetic relay according to the present invention.

FIG. 2 is a principle diagram showing a configuration example of a main part of a conventional electromagnetic relay.

[Description of Signs] 3 Main part of electromagnetic relay 4 Electromagnet 5 Contact spring set 22 Coil 23 Iron core 23a Exposed end face 24 External connection terminal 31 Yoke 31a Common terminal 32 Armature 33 Movable contact spring 33a Movable contact 41 Bobbin 41a, 41b Flange 41a 'Block Body 41a _-1 , 41a _-2 Square hole 41b _-1 , 41b _-2 concave groove 51 Make contact terminal 51 ′ Heat radiating part 51 ″ Fixing projection 51 a Make contact 51 b External connection terminal 52 Break contact terminal 52 ′ Heat radiating part 52 ″ Fixed Projection 52a Break contact 52b External connection terminal

Continuation of the front page (72) Inventor Hideto Harayama 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-61-176025 (JP, A) JP-A-59-214125 (JP) JP-A-4-286824 (JP, A) JP-A-60-60852 (JP, U) JP-A-2-8840 (JP, U) JP-A-1-103242 (JP, U) JP-A 57-170252 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 45/00-51/36

Claims (1)

(57) [Claims] 1. A electromagnet and, respective off between two flanges which are formed on both end surfaces of the bobbin winding the coil of the electric magnet
Make contact terminals and break contact terminals that are positioned and fixed around the flange by insertion from both sides of the flange,
The movable contact provided at one end by the operation of the electromagnet
Make contact of the contact terminal and break of the break contact terminal
A movable contact spring locked to the flange so as to reciprocate between the make contact and the make contact terminal and the break contact terminal,
It is widened in the region corresponding to between the two flange section
Vision "co" will comprise a heat radiating portion bent in shape, prior to
An electromagnetic relay , wherein the heat radiating portion includes a fixing protrusion which can be pressed into a square hole provided in a region of the flange on one side corresponding to the heat radiating portion.