JP3646408B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic relay, and more particularly to an assembly structure of a yoke with respect to a base.
[0002]
[Prior art]
Conventionally, as an assembly structure of the yoke with respect to the base of the electromagnetic relay, for example, as shown in FIGS. 3 to 5, the movable contact piece 11 and the fixed contact piece 12 are erected on one side of the base 10. On the other side, after an electromagnet block 20 that supports a substantially square-shaped movable iron piece 13 rotatably supported by a hinge spring 14, an upper end portion of the movable contact piece 11 and an upper end portion of the movable iron piece 13 are provided. There are cards that have a card 15 in between. Reference numeral 16 denotes a case cover.
[0003]
In the electromagnet block 20, an iron core 23 having a substantially T-shaped cross section is inserted into a center hole 22a of a spool 22 around which a coil 21 is wound, and a projecting lower end portion is used as a magnetic pole 23a, while a projecting upper end portion 23b is substantially disposed. The horizontal portion of the L-shaped yoke 24 is fixed by caulking. As shown in FIG. 4, the yoke 24 has a guide protrusion 24a and an engagement protrusion 24b formed on the side end surface of the vertical portion.
[0004]
Further, since the electromagnet block 20 rotatably supports the substantially iron-shaped movable iron piece 13 on the vertical lower end portion of the yoke 24 via the hinge spring 14, the lower end portion of the movable iron piece 13 is the iron core. It opposes the magnetic pole part 23a of 23 so that contact / separation is possible.
[0005]
On the other hand, as shown in FIGS. 4 and 5, a pair of supports 17, 17 are provided so as to face the upper surface edge of the base 10, and a guide groove 17 a is formed on the inner side surface of the support 17 in the vertical direction. Further, an engagement hole 17b communicating with the guide groove 17a is provided.
[0006]
Therefore, when the electromagnet block 20 is attached to the base 10, the guide projection 24 a of the yoke 24 is inserted into the guide groove 17 a of the support 17, and the yoke 24 is engaged with the engagement hole 17 b of the support 17. The protrusion 24b was engaged to prevent it from coming off.
4 and 5 show only the base 10 and the yoke 24 for convenience of explanation.
[0007]
Then, by applying and releasing a voltage to the coil 21 of the electromagnet block 20, the movable iron piece 13 is rotated, and the movable contact piece 11 is rotated via the card 15 reciprocating along with this, and the movable contact 11a. Was in contact with and away from the fixed contact 12a.
[0008]
[Problems to be solved by the invention]
However, in the above-described electromagnetic relay, as shown in FIG. 5, a gap D is formed between the guide groove 17 a and the movable iron piece 13 in order to facilitate the insertion of the yoke 24 into the guide groove 17 a of the support 17. It was. For this reason, the assembly accuracy is low, and the electromagnet block 20 assembled to the base 10 has a slight backlash, which causes a problem that the operation characteristics vary.
[0009]
In view of the above problems, an object of the present invention is to provide an electromagnetic relay that has high assembly accuracy and does not vary in operating characteristics.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the electromagnetic relay according to the present invention is provided with a guide groove in the vertical direction on the inner side surfaces of a pair of opposing support members protruding from the upper surface of the base, and the guide groove is provided on the side of the yoke of the electromagnetic block. In the electromagnetic relay assembled by inserting the end face from above,
An engagement protrusion is provided on the side end surface of the yoke, and at least one of the pair of cut pieces formed by providing a slit communicating with the upper side of the guide groove is the plate thickness of the yoke. The pressing protrusions that press the engaging protrusions in the plate thickness direction are formed on the cutout piece on one side, and the engagement protrusions of the yoke are formed on the remaining cutout piece. In this configuration, a locking claw is formed that is locked to the portion to prevent it from coming off .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS.
The electromagnetic relay according to this embodiment is the same as the conventional example except for the support 17 of the base 10 of the electromagnetic relay according to the conventional example. However, for convenience of explanation, only the base 10 and the yoke 24 are shown in FIGS. 1 and 2.
That is, the support groove 17 of the base 10 is formed with a guide groove 17a similar to the conventional example, but a slit 17c communicating with the guide groove 17a is formed above the guide groove 17a. Of the cut pieces 18 and 19 formed by providing the slit 17c, the inner surface of the cut piece 18 is formed with a pressing protrusion 18a that presses against the engaging protrusion 24b of the yoke 24 and presses in the thickness direction. ing. On the other hand, a locking claw 19a is provided on the inner side surface of the cutout piece 19 so as to be locked to the engagement protrusion 24b to prevent it from coming off.
[0012]
Therefore, when the guide protrusion 24a of the yoke 24 is inserted into the guide groove 17a of the support 17 and pushed down, the pressing protrusion 18a is pressed against the engaging protrusion 24b, and the yoke 24 is urged in the thickness direction. The locking claw 19a is locked to the engaging protrusion 24b and is prevented from coming off. Since others are the same as the above-mentioned conventional example, description is abbreviate | omitted.
[0013]
According to this embodiment, when the pressing protrusion 18a is pressed against the engaging protrusion 24b of the inserted yoke 24, the cut piece 18 provided with the pressing protrusion 18a is elastically deformed outward. For this reason, the frictional resistance at the time of insertion becomes small, and assembly work becomes easy.
Further, even after the insertion, the pressing protrusion 18a of the cutout piece 18 always presses the engagement protrusion 24b of the yoke 24 against the cutout piece 19 on the opposite side, so that there is an advantage that the electromagnetic block 20 is not rattled. .
[0014]
【The invention's effect】
As is apparent from the above description, according to the electromagnetic relay according to claim 1 of the present invention, the pressing projection provided on the support body is in pressure contact with the engaging projection provided on the side end surface of the yoke, and the yoke has a plate thickness. Press in the direction. For this reason, the electromagnet block composed of the yoke is positioned on the base without rattling. As a result, the assembling accuracy is improved and the operating characteristics do not vary.
Further, when an engaging protrusion protruding from the side end surface of the yoke is press-fitted into a slit provided in the base support, at least one of the cutout pieces is elastically deformed outward. For this reason, a frictional resistance becomes small and an assembling work becomes easy. As a result, it is not necessary to strictly manage the dimensional accuracy of the guide grooves and slits, and the manufacture of the parts is facilitated.
Further, not only can the electromagnet block be prevented from rattling, but also the latching claw provided on the support member prevents the yoke from coming off, so that the assembly operation can be completed with a single touch and the productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a method of assembling a yoke of an electromagnetic relay according to the present invention.
2 shows the yoke shown in FIG. 1 after assembly, where FIG. 2 (a) is a perspective view and FIG. 2 (b) is a partially enlarged view.
FIG. 3 is a cross-sectional view showing an electromagnetic relay according to a conventional example.
4 is a perspective view showing a method of assembling the yoke shown in FIG. 3. FIG.
FIGS. 5A and 5B show a state after assembling the yoke, FIG. 5A is a perspective view, and FIG. 5B is a partially enlarged view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Base, 17 ... Support body, 17a ... Guide groove, 17c ... Slit, 18, 19 ... Cut piece, 18a ... Pressing protrusion, 19a ... Locking claw, 20 ... Electromagnet block, 24 ... Yoke, 24a ... Guide protrusion , 24b ... engaging protrusions.

Claims (1)

In an electromagnetic relay in which guide grooves are provided in the vertical direction on the inner side surfaces of a pair of opposing support members projecting from the upper surface of the base, and the side end surfaces of the yokes of the electromagnet block are inserted into the guide grooves from above, and assembled.
An engagement protrusion is provided on the side end surface of the yoke, and at least one of the pair of cut pieces formed by providing a slit communicating with the upper side of the guide groove is the plate thickness of the yoke. The pressing protrusions that press the engaging protrusions in the plate thickness direction are formed on the cutout piece on one side, and the engagement protrusions of the yoke are formed on the remaining cutout piece. An electromagnetic relay characterized in that a locking claw is formed that is locked to a part to prevent it from coming off.

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