Patent Application
20130222084
The present invention relates to an electromagnetic relay.
One of conventionally known magnetic relays includes plural contact mechanisms arranged side by side on a base, each contact mechanism including contacts which are capable of coming into and out of contact with each other (for example, refer to Patent Literature 1).
In Patent Literature 1, each contact mechanism includes a movable contact piece and a fixed contact piece. Each of the movable and fixed contact pieces is provided with one contact.
In another known electromagnetic relay, each of the movable and fixed contact pieces in a contact mechanism is provided with plural contacts.
Patent Document 1: Japanese Unexamined Patent Application Publication No. 2006-344397
However, in an electromagnetic relay in which each of the movable and fixed contact pieces of each contact mechanism is provided with one contact like the electromagnetic relay of Patent Literature 1, the contact reliability of contacts is low, and the intervention of foreign objects and the like could cause contact failure.
On the other hand, when each of the movable and fixed contact pieces of each contact mechanism is provided with plural contacts, the contact reliability of the contacts can be prevented from lowering. However, it is difficult to adjust the contact capacity, thus complicating the manufacturing process and increasing the cost.
An object of the present invention is to provide an electromagnetic relay with more contact reliability of contacts and manufactured at less cost.
A first aspect of the present invention is an electromagnetic relay including: a drive part; a mobile body moved by driving the drive part; and a plurality of contact mechanisms in which contact and separation of contacts are switched by the movement of the mobile body, the drive part, mobile body, and contact mechanisms being assembled into a body, in which each of the plurality of contact mechanisms includes a movable contact part and a fixed contact part, and the plurality of contact mechanisms include at least one contact mechanism in which each of the movable and fixed contact parts is provided with one contact and at least one contact mechanism in which at least one of the movable and fixed contact parts is provided with plural contacts.
A second aspect of the present invention is that the contact mechanism provided with the plural contacts is a normally-closed contact.
A third aspect of the present invention is that the contact mechanism provided with the plural contacts is assembled into the position adjacent to the drive part.
A fourth aspect of the present invention is that the contact mechanism provided with the plural contacts is a contact mechanism in which one of the movable and fixed contact parts is provided with one contact while the other contact part is provided with plural contacts.
A fifth aspect of the present invention is that the fixed contact part is provided with one contact and the movable contact part is provided with plural contacts.
According to the present invention, the plurality of contact mechanisms include at least a contact mechanism in which each of the movable and fixed contact parts is provided with one contact and include at least a contact mechanism in which at least one of the movable and fixed contact parts is provided with a plurality of contacts. When the electromagnetic relay includes at least one contact mechanism in which at least one of the movable and fixed contact parts is provided with a plurality of contacts as described above, the contact reliability of the contacts can be increased. Moreover, when the electromagnetic relay includes at least one contact mechanism in which each of the movable and fixed contact parts is provided with one contact, an increase in cost can be prevented.
Hereinafter, a detailed description is given of embodiments of the present invention with reference to the drawings. The following plural embodiments include the same constituent elements. Hereinafter, the same constituent elements are given the same reference numerals, and redundant description thereof is omitted.
An electromagnetic relay 1 according to a first embodiment is formed into a substantially box-like shape by putting a case 20 over an electromagnetic relay main part 10 and bonding and fixing the case 20 to a body 40.
The electromagnetic relay main part 10 is formed by assembling an electromagnet device (a drive part) 30 and plural contact mechanisms 60 and 70 into the body 40.
Specifically, the electromagnet device 30 is assembled into a central part of the body 40 in the longitudinal direction, and the plural contact mechanisms 60 and 70 (three each in the first embodiment) are assembled into both sides of the body 40 in the longitudinal direction (at the both ends of the electromagnet device 30). Later-described movable contact parts 61 and 71 of the contact mechanisms 60 and 70 are clamped by a card (a mobile body) 50, thus forming the electromagnetic relay main part 10.
The electromagnet device (drive part) 30 is then driven by switching on and off electric conduction, and the drive of the electromagnet device (drive part) 30 is transmitted to the card 50, so that each of the plural contact mechanisms 60 and 70 can be switched to an opened state or a closed state.
A publicly-known device can be used as this electromagnet device (drive part) 30. For example, the electromagnet device 30 can be composed of a permanent magnet, a yoke, an armature, a movable spring, and a coil. With the thus-configured electromagnet device 30, the coil is energized to move the armature, and with the movement of the armature, the card 50 can be moved in the longitudinal direction of the body 40.
The electromagnet device 30 includes substrate connecting terminals 30a for connection with a not-shown substrate. The substrate connecting terminals 30a are inserted into respective terminal insertion holes 44a, which are formed in a recess 44 of the body 40 for the electromagnet device (drive part) 30. The electromagnet device 30 is then pressed into the recess 44 so that the terminal 30a protrudes to the lower surface side of the body 40, and the electromagnet device 30 is thus assembled into the central part of the body 40 in the longitudinal direction.
In the both ends of the body 40 having a substantially rectangular shape in the longitudinal direction, plural slit openings 41 for fixing the contact mechanisms are formed and extended in the cross-direction. Between the slit openings 41 adjacent to each other in the longitudinal direction of the body 40, slits 42 (latch parts: groove portions) are individually formed. To the slits 42, ends of later-described partition walls 21 are inserted.
In the periphery of the body 40 is formed a peripheral groove 43 for attachment of the case 20. The peripheral groove 43 is fitted over and bonded to the peripheral part 20a of the case 20, so that the case 20 is fitted over the body 40.
On each side of the recess 44 for mounting the electromagnet device (drive part) 30 in the central part of the body 40 in the cross direction, a guide recess 45 extending in the longitudinal direction of the body 40 is formed, so that the end of the card 50 is guided and moved in the guide recess 45.
Moreover, each of the plural contact mechanisms 60 includes a movable contact part 61 and a fixed contact part 62, and each of the plural contact mechanisms 70 includes a movable contact part 71 and a fixed contact part 72.
The movable contact part 61 includes: a sheeted plate spring 61a clamped by the card 50; a fixed plate 61b attached to the proximal end of the plate spring 61a; a substrate connecting terminal 61c provided in the fixed plate 61b; and a movable contact 61d provided in the distal end of the plate spring 61a.
On the other hand, the fixed contact part 62 includes: an upper fixed plate 62a; a lower fixed plate 62b; a substrate connecting terminal 62c provided in the lower fixed plate 62b; and a fixed contact 62d which is provided in the upper fixed plate and is capable of coming into and out of contact with the movable contact 61d.
The movable contact part 71 includes: a sheeted plate spring 71a clamped by the card 50; a fixed plate 71b attached to the proximal end of the plate spring 71a; a substrate connecting terminal 71c provided in the fixed plate 71b; and a movable contact 71d provided at the distal end of the plate spring 71a.
On the other hand, the fixed contact part 72 includes: an upper fixed plate 72a; a lower fixed plate 72b; a substrate connecting terminal 72c provided in the lower fixed plate 72b; and a fixed contact 72d which is provided in the upper fixed plate 72a and is capable of coming into and out of contact with the movable contact 71d.
The terminals 61c, 62c, 71c, and 72c are inserted into the slit openings 41 so as to protrude on the lower surface side of the body 40, and the movable contact parts 61 and 71 and fixed contact parts 62 and 72 are pressed into the respective slit openings 41, so that the movable contact parts 61 and 71 and fixed contact parts 62 and 72 are assembled into the body 40.
Herein, in the first embodiment, the movable contact part 61 and the fixed contact part 62 of each contact mechanism 60 are provided with one contact 61d and one contact 62d, respectively.
Moreover, the movable contact part 71 and the fixed contact part 72 of each contact mechanism 70 are provided with two contacts 71d and two contacts 72d, respectively. In the first embodiment, the two contacts 71d and 71d of the movable contact part 71 are arranged vertically side by side, and the two contacts 72d and 72d of the fixed contact part 72 are arranged vertically side by side. The upper contacts 71d and 72d come into contact with each other, and the lower contacts 71d and 72d come into contact with each other.
As described above, the electromagnetic relay 1 according to the embodiment includes at least one contact mechanism 60 in which the movable and fixed contact parts and 62 are provided with the contacts 61d and 62d, respectively. The electromagnetic relay 1 further includes at least one contact mechanism 70 in which at least one of the movable and fixed contact parts 71 and 72d (both, in this embodiment) is provided with plural (two) contacts 71d or 72d.
In this embodiment, as shown in
On the other hand, the contact mechanisms (contact mechanisms each including one contact) 60 are normally-open contacts. To be specific, in each contact mechanism (contact mechanism each including one contact) 60, when the electromagnet device (drive part) 30 is not excited, the contacts 61d and 62d are separated from each other, and when the electromagnet device (drive part) 30 is excited, the contacts 61d and 62d come into contact with each other.
In this embodiment, as shown in
By making the electromagnetic relay 1 a multipole electromagnetic relay as described above, the one electromagnetic relay 1 can be adapted to various types of circuits and can be used as an electromagnetic relay meeting various requirements such as an electromagnetic relay for signal control and an electromagnetic relay for high-current control.
The case 20 has a substantially box-like shape open at the bottom and is configured to cover the electromagnet device (drive part) 30 and plural contact mechanisms 60 and 70 assembled into the body 40 from above. In the first embodiment, the case 20 is fit onto the body 40 by bonding the peripheral part 20a of the case 20 to the peripheral groove 43 with an adhesive. Reference numeral 23 of
In the first embodiment, the partition walls 21 are provided within the case 20. Specifically, in the case 20, three (plural) partition walls 21 extending in the cross direction are arranged in the longitudinal direction side by side. In the central part of the partition walls 21 in the cross direction, space 22 allowing the card 50 to move therethrough is formed. In other words, six of the partition walls 21 are arranged side by side on one side in the cross direction, and the other six are arranged side by side on the other side in the cross direction. Reference numeral 24 of
Moreover, in the body 40, engagement parts are provided at respective portions corresponding to the partition walls 21. The ends of the partition walls 21 are engaged with the engagement parts when the case 20 is fit over the body 40.
In the first embodiment, each engagement portion includes a slit (groove) 42 into which the end of the corresponding partition wall 21 of the case 20 is inserted; and an adhesive-introducing through hole 42b formed in the slit 42 so as to penetrate to the rear side of the body 40.
The ends of the partition walls 21 are engaged with the respective engagement portions with an adhesive. Specifically, in the process of fitting the case 20 onto the body 40, the ends of the partition walls 21 of the case 20 are inserted into the respective slits 42, and in this state, the adhesive is introduced to the slits 42 through the through holes 42b from the rear side of the body 40. The ends of the partition walls 21 are thus bonded and fixed to the respective engagement portions.
By bonding and fixing the ends of the partition walls 21 and the engagement portions in such a manner, in the process of solidification bonding (thermosetting) of the case 20 to the body 40, the case 20 and body 40 can be prevented from warping or deforming by expansion when the electromagnetic relay 1 is heated and by contraction when the electromagnetic relay 1 is cooled.
Furthermore, in the first embodiment, a regulating part configured to regulate the movement of the adhesive is formed between each slit (engagement portion) 42 and the corresponding partition wall 21.
Specifically, as shown in
In the first embodiment, moreover, the plural contact mechanisms 60 and 70 are isolated from each other with the partition walls 21 in the state where the case 20 is fitted over the body 40.
In other words, the partition walls 21 are configured to individually separate the contact mechanisms 60 and 70 from each other when the body 40 is fixed to the case 20. By separating the contact mechanisms 60 and 70 from each other with the partition walls 21, the contact mechanisms 60 and 70 are insulated from each other. In the first embodiment, specifically, the partition walls 21 have a function as an insulating member for insulating the contact mechanisms 60 and 70 from each other. In this embodiment, each partition wall 21 is made thin at the end portion. This can enhance the insulation strength of the contact mechanisms 60 and 70 while facilitating insertion of the ends of the partition walls 21 into the respective slits 42.
Furthermore, in the first embodiment, as shown in
As described above, in this embodiment, the plural contact mechanisms 60 and 70 include at least the one contact mechanism 60 having the movable and fixed contact parts 61 and 62 which are provided with the contacts 61d and 62d, respectively, and at least the one contact mechanism 70 having the movable and fixed contact parts 71 and 72 at least one of which is provided with plural contacts 71d or 72d. The provision of at least the one contact mechanism 70 having the movable and fixed contact parts 71 and 72 at least one of which is provided with the plural contacts 71d or 72d can increase the contact reliability of contacts of the electromagnetic relay 1. Moreover, the provision of at least the one contact mechanisms 60 having the movable and fixed contact parts 61 and 62 which are provided with the contacts 61d and 62d, respectively, can prevent the cost from increasing. According to the present invention, therefore, it is possible to obtain the electromagnetic relay 1 which can reduce the cost while increasing the contact reliability.
According to the first embodiment, the contact mechanisms 70 each including the plural contacts 71d or 72d are used as normally-closed contacts.
In the case of a normally-closed contact, once foreign objects are attached to the contact in the process of assembling the contact mechanism into the body 40, it is difficult to remove the same. Accordingly, the use of the contact mechanisms (the contact mechanism each including plural contacts) 70, which have higher contact reliability than the contact mechanisms (the contact mechanism each including one contact) 60, as the normally-closed contact can further increase the contact reliability.
An electromagnetic relay 1A according to a second embodiment basically has substantially the same configuration as that of the electromagnetic relay 1 of the first embodiment. The electromagnetic relay 1A is formed into a substantially box-like shape by putting the case 20 over the electromagnetic relay body portion 10 and bonding and fixing the case 20 to the body 40.
The major difference of the electromagnetic relay 1A of the second embodiment from the electromagnetic relay 1 of the first embodiment is that the contact mechanisms (contact mechanisms each including plural contacts) 70 are assembled into the body 40 at the position adjacent to the electromagnet device (drive part) 30.
Specifically, as shown in
The second embodiment can also bring about similar operations and effects as those of the first embodiment.
Meanwhile, where the contact mechanisms of the electromagnetic relay 1 are repeatedly opened and closed to be worn out, the contact mechanism located closer to the drive part is more likely to be subjected to adherence of waste powder to the contacts.
Consequently, in the second embodiment, the contact mechanisms (contact mechanisms each including plural contacts) 70, which have higher contact reliability than the contact mechanisms (contact mechanisms each including one contact) 60, is located adjacent to the electromagnet device (drive part) 30, so that the contact reliability can be further increased.
An electromagnetic relay 1B according to a third embodiment basically has substantially the same configuration as the electromagnetic relay 1A of the aforementioned second embodiment. The electromagnetic relay 1B is formed in a substantially box-like shape by putting the case 20 over the electromagnetic relay main part 10 and bonding and fixing the case 20 to the body 40.
Herein, the major difference of the electromagnetic relay 1B of the this embodiment from the electromagnetic relay 1A of the second embodiment is that the contact mechanism including plural contacts is a contact mechanism 70B in which one of the movable and fixed contact parts is provided with one contact and the other contact part is provided with plural contacts.
Specifically, as shown in
This embodiment can also bring about the same operations and effects as those of the aforementioned first embodiment.
Like this embodiment, when the contact mechanism provided with plural contacts is composed of the contact mechanism 70B, in which one of the movable and fixed contact parts is provided with one contact while the other contact part is provided with plural contacts, it is possible to reduce the steps of providing plural contacts, thus facilitating the manufacturing and reducing the cost.
In the third embodiment, in particular, the fixed contact part 72 is provided with the one contact 72d while the movable contact part 71 is provided with the two (plural) contacts 71d. Therefore, in the process of moving the movable contact part 71 to bring the contacts 71d and 72d into contact with each other, even if the position of the movable contact part 71 is shifted and only one of the contacts 71d comes into contact with the surface of the contact 72d (the side surface in
In other words, by providing the one contact 72d in the fixed contact part 72 while providing the two (plural) contacts 71d in the movable contact part 71, it is possible to prevent the contacts 71d from coming into partial contact with the contact 72d (prevent the contact 72d from coming into contact with only one of the two contacts 71d), thus increasing the contact reliability.
Hereinabove, the preferred embodiments of the present invention are described. However, the present invention is not limited to the above-described embodiments and can be variously modified.
For example, in each example illustrated in the above-described embodiments, the plural contact mechanisms are arranged on both sides of the drive part side by side. However, the plural contact mechanisms may be arranged side by side on one side of the drive part.
Moreover, the specifications (shapes, sizes, layouts, and the like) of the movable springs, contacts, and other details can be properly changed.
According to the present invention, it is possible to provide an electromagnetic relay with the contact reliability of contacts increased and the cost reduced.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2010-249965 | Nov 2010 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2011/073650 | 10/14/2011 | WO | 00 | 5/1/2013 |
