JP4360732B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a relay that opens and closes contacts with a coil, and more particularly to a relay covered with a cover.
[0002]
[Prior art]
In recent years, many relays have been used in automobiles due to automation, but severe demands have been imposed as they are installed in automobiles. One of these is the need for noise reduction. In view of this, some coils and contact devices constituting a relay are placed on a U-shaped spring to absorb the kinetic energy at the time of opening and closing the contacts, thereby reducing the noise. However, with such a configuration, since the rigidity of the U-shaped spring is low, resonance occurs at a low frequency, and when the resonance occurs, the coil and the contact device are greatly shaken to cover the coil and the contact device. This causes a problem of colliding with the inner wall with a large collision energy.
[0003]
[Problems to be solved by the invention]
In view of the above problems, an object of the present invention is to prevent a cover inner wall and a component of a relay from colliding with a large collision energy.
[0004]
[Means for Solving the Problems]
According to the present invention, in a relay in which a coil formed by winding a coil wire around a coil bobbin having a resin end wall and a contact member swung by the coil are covered with a resin cover, the end of the coil bobbin part wall attached to a base which is attached via an elastic member to the substrate, the cover is attached to the substrate, one of the end walls and the cover of the coil bobbin, or, both, until they impinge upon the vibration There is provided a relay provided with a collision energy reducing means for reducing the energy at the time of collision by reducing the moving distance.
In the relay configured as described above, since the moving distance until the end wall of the coil bobbin collides with the cover is small at the time of vibration, the resin-made ones collide with each other, so the collision energy is small.
[0005]
The collision energy reducing means is preferably a protrusion integrally formed with the cover, and a plurality of collision energy reducing means are provided in a region far from the elastic member.
Further, the protrusion can be extended linearly to have a function of a cover stiffener.
By mixing particles having a diameter of several tens to several hundreds of μm with the adhesive that bonds the cover and the substrate, it is possible to prevent the unevenness of the adhesive and stably perform the bonding.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a view from above with the upper wall of the cover removed, FIG. 2 is a view from the side with the side wall removed, and FIG. 3 is an end view with the end wall removed. It is the figure seen from the direction. Referring to each figure, a corbobbin first end wall 22 and a coil bobbin second end wall 22 ′ of a coil bobbin 21 of a coil 20 are attached to the base 10, and the coil bobbin first end wall 22 and the coil bobbin second end wall 22 ′ are not shown. The iron core is supported so as to be bridged, and the coil conductor 23 is wound around the iron core as shown by a one-dot chain line to constitute the coil 20.
[0007]
A first member 31 (made of copper alloy) of a contact device 30 is attached to the first end wall 22 of the coil bobbin, and a second member 32 (made of iron) is attached to the first member 31 via a spring member 33 (made of copper alloy). It is attached so that it can swing.
As shown in FIGS. 2 and 3, the base 10 is attached to the substrate 50 via a plurality of springs 40. The spring 40 is connected to a terminal 60 extending downward from the substrate 50 in correspondence with a dotted line.
[0008]
When a relay or a unit on which the relay is mounted vibrates due to an external force, if the vibration frequency matches the natural frequency of the relay drive unit (mass above the spring 40), resonance will occur and the vibration will increase. .
[0009]
Therefore, in this embodiment, the cover 70 is provided with a plurality of protrusions to reduce the gaps between the coil bobbin first end wall 22, the coil bobbin second end wall 22 ′, and the cover 70, and before the runout increases. It is possible to prevent a collision with a large collision energy.
[0010]
On the side walls 71 (upper side in the figure) and 72 (lower side in the figure) of the cover 70, protrusions 71a and 71b and 72a and 72b projecting inward are formed, respectively. The protrusions 71a and 72a reduce the gap between the coil bobbin first end wall 22 and the side walls 71 and 72 of the cover 70, and the protrusions 71b and 72b reduce the gap between the coil bobbin second end wall 22 ′ and the side walls 71 and 72 of the cover 70. ing. Each protrusion does not collide with the metal first, second, and third members (31, 32, 33) of the contact device 30.
[0011]
With the configuration as described above, the projections 71a, 71b, 72a, 72b are formed, so that the coil bobbin first end wall 21 and the second end wall 22 forming the coil 20 are attached to the cover 70 by vibration. Even if it collides, the moving distance until it collides with the cover 70 is small, and since they are made of resin, the collision energy is small and the collision sound is small.
[0012]
As is clear from FIG. 3, the protrusions 71 a, 71 b, 72 a, 72 b extend downward from the upper wall 75, but end in the middle and do not reach the base 10. In this way, all the protrusions are arranged on the upper side. This is because, in this structure in which the coil 20 is arranged on the elastically supported base 10, the coil 20 is arranged on the upper side. Because it shakes greatly.
[0013]
The lower edges of the side walls 71 and 72 and the end walls 73 and 74 of the substrate 50 and the cover 70 are adhered by an adhesive 80, and particles of several tens to several hundreds of μm are mixed in the adhesive. As the adhesive, a thermosetting adhesive that is cured by heat or a UV curable adhesive that is cured by irradiation with ultraviolet rays is used. Further, particles made of glass, epoxy, or metal are used as particles mixed in the adhesive.
In this way, by mixing particles, it is possible to suppress the occurrence of the problem that the fluidity is too high with the adhesive alone and the adhesive thickness becomes non-uniform, and the amount of the adhesive itself can be reduced. .
[0014]
【The invention's effect】
In the relay according to the present invention, the coil bobbin having a resin end wall and a coil formed by winding a coil conductor and a contact member swung by the coil are covered with a resin cover. attached to the wall base, cover is attached to the substrate, one of the end walls and the cover of the coil bobbin, or, both, the energy of collision by reducing the movement distance to both impinge upon vibration Collision energy reduction means to reduce is provided, and since the moving distance until collision with the end wall of the coil bobbin is small at the time of vibration, the resin-made items collide with each other, so the collision energy is small. The impact sound is small.
[Brief description of the drawings]
FIG. 1 is a view of the structure of an embodiment of the present invention as viewed from above, with an upper wall removed (along line II in FIG. 2).
FIG. 2 is a view taken along the line II-II in FIG.
3 is a view taken along line III-III in FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Base 20 ... Coil 21 ... Coil bobbin 22 ... 1st coil bobbin end wall 22 '... 2nd coil bobbin end wall 30 ... Contact device 31 ... (Contact device) 1st member 32 ... (Contact device) 2nd member 33 ... Spring member 40 (contact device) ... Spring 50 ... Substrate 60 ... Terminal 70 ... Covers 71, 72 ... Side walls 71a, 71b, 72a, 72b ... Projections 73, 74 ... End wall 75 ... Upper wall 80 ... Adhesive

Claims (6)

In a relay in which a coil bobbin having a resin end wall is wound with a coil conductor and a contact member swung by the coil is covered with a resin cover.
The end wall of the coil bobbin is attached to a base attached to the substrate via an elastic member , and the cover is attached to the substrate,
One of the end walls and the cover of the coil bobbin, or, both, provided a collision energy reduction means for reducing the energy of collision by reducing the movement distance to both impinge upon vibration, characterized in that relay.   2. The relay according to claim 1, wherein the collision energy reducing means is a resin protrusion that is integrally formed with the cover and protrudes toward the end wall of the coil bobbin.   The relay according to claim 2, wherein a plurality of protrusions are provided.   The relay according to claim 2, wherein the protrusion is provided in a region far from the elastic member.   The relay according to claim 2, wherein the protrusion has a length and extends linearly and has a function of a stiffener for the cover.   The relay according to claim 1, wherein the cover and the substrate are bonded with an adhesive including particles having a diameter of several tens to several hundreds of μm.

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