JPH0621156Y2 - Electromagnetic relay - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electromagnetic relay.

[Background technology]

1 and 2 are perspective views of a yoke (3) 'and an armature (4) of a conventional electromagnetic relay, the yoke (3)' is formed in a substantially L shape, and the side thereof is shown. The center portion of the tip of the piece (3b) is cut out, and the locking pieces (13) are formed on both sides of the notch. Armature
The (4) is formed in a substantially T shape, and projecting pieces (12) projecting to both sides are formed on the upper part. This armature (4) is a yoke
It is placed in the notch of (3) 'and both protrusions (12) (12)
Is placed on both locking pieces (13) (13), and armature (4) is yoked.
It will be pivotally supported by (3) ′. Fig. 3
FIG. 3A shows an OFF state in which the coil is not excited and is not attracted to the iron core (not shown), and FIG. 3B shows an ON state when the coil is attracted to the iron core. The upper surface of the locking piece (13) and the protruding piece (1
The lower surface of 2) is flat, and in the OFF state, the armature (4) is biased by the return spring in the direction of the arrow in FIG. 3 (a). In the off state shown in), the point X becomes the fulcrum of the armature (4). Further, in the ON state shown in FIG. 3 (b), the Y point serves as a fulcrum, and since the fulcrum of the armature (4) at the time of ON and OFF is different in this way, characteristics such as excitement in opening and closing of contacts and open circuit voltage There was a problem of change.

[Purpose of device]

The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic relay for stabilizing the characteristics by keeping the fulcrum of the armature at a fixed position when the power switch is turned on and off.

[Disclosure of device]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figures 4 and 5 show concrete perspective views of the yoke (3) and the armature (4), which is a substantially L-shaped yoke (comprising a vertical piece (3a) and a horizontal piece (3b)). 3)
The pivotal support pieces (9) extend integrally from both sides behind the tip of the horizontal piece (3b). The pivot piece (9) projects so as to incline downward as it goes forward from the tip of the lateral piece (3b),
On its upper surface, there is an inclined surface (10) which inclines downward as it goes forward. The pivot piece (9) projects forward from the tip surface of the lateral piece (3b). Furthermore, the tip end surface of the lateral piece (3b) of the yoke (3) is formed with an inclined surface (11) that extends in a direction of expanding with respect to the inclined surface (10) of the pivot piece (9). . Place the lower edges of both protrusions (12) (12) on the inclined surface (10) of the pivot piece (9) so that the inner surface of the upper part of the armature (4) contacts the lower edge of the inclined surface (11). ) Is placed on. Therefore, since the inclined surface (10) is inclined downward, the lower end edge of the protruding piece (12) on the inclined surface (11) side is placed on the inclined surface (10) of the pivot support piece (9). Then, the armature (4) is pivotally supported by the yoke (3). Also, as shown in FIG.
An inverse shaving angle θ is formed between the inner surface of the upper part of the armature (4) and the inclined surface (11). Since the lower surface of the projecting piece (12) is flat, the lower end edge of the projecting piece (12) on the yoke (3) side serves as the fulcrum A of the armature (4). Since the rotation fulcrum of (4) is one point, a stable hinge structure with less sliding and friction can be realized.

FIG. 6 shows the structure of an electromagnetic relay using the yoke (3) and the armature (4) described above. In the figure, (1) is a coil wound around a coil bobbin, and (2) is a rod-shaped iron core fitted and inserted in the coil bobbin. One end of the iron core (2) is fixed to the vertical piece (3a) of the yoke (3), and when the coil (1) is energized, the iron core
Magnetic path is formed in (2), yoke (3), armature (4), armature
(4) will be adsorbed on the adsorption surface (5) of the iron core (2). (1
4) is a coil terminal. A contact spring is attached to the upper end of the armature (4).
(6) are installed opposite to each other, and the movable contacts (8) and (8) fixed to the tip of the contact spring (6) and the fixed contacts (7) that are arranged above and below the movable contact (8) are opposed to each other. ), The contact is opened and closed. (15) is a fixed terminal plate connected to the fixed contact (7),
The tip of the case (16) projects from the lower surface. (17) is a return spring for returning the armature (4).

(6a) is a common terminal integrally formed with the contact spring (6), and (18) is a caulking projection.

[Effect of device]

As described above, the present invention, in the electromagnetic relay, inclines downward as it goes forward from both sides behind the end of the horizontal piece of the yoke,
Further, the pivotal support pieces, each having a first inclined surface located on the upper side and located in front of the tip end surface of the lateral piece, are integrally extended to form the first pivotal support piece.
The second inclined surface in the direction of expanding with respect to the inclined surface is formed on the distal end surface of the horizontal piece, and the upper portion of the armature is formed in a substantially T shape to form a protruding piece having a flat lower surface protruding to both sides. Respectively, and one surface of the upper part of the armature is in contact with the lower edge of the second inclined surface,
Since the lower end edge of the inclined surface side is placed on the first inclined surfaces of both pivotal support pieces, the armature is pivotally supported on the yoke so that the armature can swing freely. The lower end edge of the armature protrusion pivotally supported on the second inclined surface side is the fulcrum of the armature, and the fulcrum is one point compared with the conventional one in which the fulcrum was shifted between on and off. It is possible to obtain a stable hinge structure with less friction, and it has the advantages of stable impression and open circuit voltage.

[Brief description of drawings]

FIGS. 1 and 2 are perspective views of a conventional example, FIGS. 3 (a) and 3 (b) are operation explanatory views of the same, FIG. 4 is an exploded perspective view of an embodiment of the present invention, and FIG. A side view and FIGS. 6 (a) to 6 (e) are views showing the structure of the above electromagnetic relay. (1) is a coil, (2) is an iron core, (3) is a yoke, (4) is an armature,
(5) is a suction surface, (6) is a contact spring, (7) is a fixed contact, (8) is a movable contact, (9) is a pivot piece, (10) is the first inclined surface, and (11) is The second slanted surface, (12) shows a protrusion.

Claims (1)

[Scope of utility model registration request] Claims: 1. An iron core wound with a coil, a yoke having a substantially L-shape, which is composed of a vertical piece and a horizontal piece, the vertical piece being fixed to the iron core and forming a magnetic path with the iron core, and a yoke. The armature is pivotally supported at the end of the armature and the tip of the armature is placed facing the attraction surface of the iron core to excite the coil so that the tip of the armature is attracted to the attraction surface of the iron core. , In an electromagnetic relay in which the contacts are opened and closed through a contact spring that is installed opposite to the armature, the end of the horizontal piece of the yoke is inclined downward as it goes to the front from both sides behind and the tip of the horizontal piece. The pivotal support pieces each having a first inclined surface located on the upper side of the front surface are integrally extended to form a second inclined surface in a direction of expanding with respect to the first inclined surface of the pivotal support piece. Formed on the tip surface of the horizontal piece, the upper part of the armature is formed in a substantially T shape, and each of the projecting pieces having flat lower surfaces projecting to both sides is formed. The lower end edges of the two projecting pieces on the second inclined surface side are placed on the first inclined surfaces of both pivot supporting pieces in contact with the lower end edges of the two inclined surfaces, and the armature is pivotally pivoted on the yoke. An electromagnetic relay characterized by being supported.