JP2013030310A - Contact device and electromagnetic relay using the same - Google Patents

Contact device and electromagnetic relay using the same Download PDF

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JP2013030310A
JP2013030310A JP2011164192A JP2011164192A JP2013030310A JP 2013030310 A JP2013030310 A JP 2013030310A JP 2011164192 A JP2011164192 A JP 2011164192A JP 2011164192 A JP2011164192 A JP 2011164192A JP 2013030310 A JP2013030310 A JP 2013030310A
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contact
fixed
housing
movable contact
movable
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JP2011164192A
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JP5923749B2 (en
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Akihiro Okuda
晃弘 奥田
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Panasonic Corp
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Panasonic Corp
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Priority to JP2011164192A priority Critical patent/JP5923749B2/en
Priority to EP20120174868 priority patent/EP2551868B1/en
Priority to CN201210261855.0A priority patent/CN102903575B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H01H1/26—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support
    • H01H1/28—Assembly of three or more contact-supporting spring blades
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/56—Contact spring sets
    • H01H50/58—Driving arrangements structurally associated therewith; Mounting of driving arrangements on armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
    • H01H50/641—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rectilinear movement
    • H01H50/642—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rectilinear movement intermediate part being generally a slide plate, e.g. a card
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2227—Polarised relays in which the movable part comprises at least one permanent magnet, sandwiched between pole-plates, each forming an active air-gap with parts of the stationary magnetic circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H01H1/26—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support
    • H01H2001/265—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support having special features for supporting, locating or pre-stressing the contact blade springs

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Contacts (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a contact device and an electromagnetic relay using the contact device capable of preventing separation of contact due to a large current.SOLUTION: The contact device includes plural contact holding springs 71 each having a blade spring fixed with a movable contact 51. Each contact holding spring 71 has a swelling part 71a swelling toward the side where a fixed contact 52 is positioned (right side in the figure) with respect to the movable contact 51. When a large current flows, currents flow at both ends of the swelling part 71a in the directions opposite to each other and a repulsive force that acts therebetween so that the contact holding spring 71 is deformed in a direction the movable contact 51 is pressed onto the fixed contact 52. This prevents separation of the contact.

Description

本発明は、接点装置及び該接点装置を用いた電磁リレーに関するものである。   The present invention relates to a contact device and an electromagnetic relay using the contact device.

従来から、接点装置として、図２に示すように、板ばねからなる接点保持ばね７１に可動接点５１を保持し、この接点保持ばね７１の弾性変形により、固定接点５２に対する可動接点６１の変位を可能としたものがある（例えば、特許文献１参照）。上記のような接点装置は、例えば、電磁石の磁力によって可動接点５１が駆動される電磁リレーに用いられる。   Conventionally, as a contact device, as shown in FIG. 2, the movable contact 51 is held by a contact holding spring 71 made of a leaf spring, and the displacement of the movable contact 61 relative to the fixed contact 52 is caused by elastic deformation of the contact holding spring 71. Some have been made possible (see, for example, Patent Document 1). The contact device as described above is used, for example, in an electromagnetic relay in which the movable contact 51 is driven by the magnetic force of an electromagnet.

実開昭６３−３７０５２号公報Japanese Utility Model Publication No. 63-37052

ここで、可動接点５１と固定接点５２との間に大電流が流れた場合、可動接点５１と固定接点５２との間に斥力が発生する。例えば、図２に矢印Ａ３で示す向きで（つまり固定接点５２から可動接点５１に）大電流が流れた場合、固定接点５２において矢印Ａ４で示すように接触範囲５０に流入する電流と、可動接点５１において矢印Ａ５で示すように接触範囲５０から流出する電流とによって発生する電磁力が、矢印Ａ６で示すように可動接点５１を固定接点５２から引き離すような斥力として作用する。そして、この斥力が接点保持ばね７１のばね力を上回ると、接点の開離（すなわち、固定接点５２からの可動接点５１の乖離）が発生する可能性がある。   Here, when a large current flows between the movable contact 51 and the fixed contact 52, a repulsive force is generated between the movable contact 51 and the fixed contact 52. For example, when a large current flows in the direction indicated by the arrow A3 in FIG. 2 (that is, from the fixed contact 52 to the movable contact 51), the current flowing into the contact range 50 as indicated by the arrow A4 at the fixed contact 52 and the movable contact 51, the electromagnetic force generated by the current flowing out of the contact range 50 as indicated by the arrow A5 acts as a repulsive force that separates the movable contact 51 from the fixed contact 52 as indicated by the arrow A6. When this repulsive force exceeds the spring force of the contact holding spring 71, the contact may be disengaged (that is, the movable contact 51 is separated from the fixed contact 52).

さらに、上記のような接点の開離の際に、可動接点５１と固定接点５２との間にアーク放電が発生した場合、これに伴う高熱によって可動接点５１と固定接点５２との溶着が発生してしまう可能性がある。   Further, when arc discharge occurs between the movable contact 51 and the fixed contact 52 at the time of opening the contact as described above, welding between the movable contact 51 and the fixed contact 52 occurs due to high heat accompanying this. There is a possibility that.

本発明は、上記事由に鑑みて為されたものであり、その目的は、大電流による接点の開離が抑えられる接点装置及び該接点装置を用いた電磁リレーを提供することにある。   The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide a contact device capable of suppressing the opening of the contact due to a large current and an electromagnetic relay using the contact device.

本発明の接点装置は、それぞれ板ばねからなる複数個の接点保持ばねが厚さ方向に重ねられてなり一端部に可動接点を保持した接点保持体と、前記接点保持体の他端部が固定されるとともに前記接点保持体の弾性変形によって前記可動接点が離接可能な位置に固定接点を保持したハウジングとを備え、各接点保持ばねは、前記可動接点に対して前記固定接点が位置する方向に膨出した膨出部を有することを特徴とする。   The contact device according to the present invention includes a contact holding body in which a plurality of contact holding springs each made of a leaf spring are stacked in the thickness direction and holding a movable contact at one end, and the other end of the contact holding body is fixed. And a housing holding a fixed contact at a position where the movable contact can be separated from the movable body by elastic deformation of the contact holding body, and each contact holding spring has a direction in which the fixed contact is positioned with respect to the movable contact It has the bulging part which bulged in.

上記の接点装置において、少なくとも１個の前記接点保持ばねについて、前記膨出部と、隣接する他の前記接点保持ばねとの間には、隙間が設けられていることが望ましい。   In the above contact device, it is preferable that at least one of the contact holding springs is provided with a gap between the bulging portion and another adjacent contact holding spring.

また、上記の接点装置において、各膨出部はそれぞれ角状に曲げられた部位を介して互いに連結された複数個の平坦な部位からなるものであってもよい。   Further, in the above contact device, each bulging portion may be composed of a plurality of flat portions connected to each other via a portion bent into a square shape.

さらに、上記の接点装置において、前記固定接点に電気的に接続されて一部が前記ハウジング外に突出する形で前記ハウジングに保持された端子板を備え、前記膨出部は、前記端子板の近傍に位置していてもよい。   Furthermore, the contact device includes a terminal plate electrically connected to the fixed contact and held in the housing in a part projecting out of the housing, and the bulging portion is formed of the terminal plate. It may be located in the vicinity.

本発明の電磁リレーは、上記いずれかの接点装置と、前記ハウジングに収納及び保持された電磁石と、前記ハウジングに収納されて前記電磁石の磁力によって駆動されるアーマチュアとを備え、前記可動接点は、前記アーマチュアに連動して前記固定接点に対して離接することを特徴とする。   An electromagnetic relay of the present invention includes any one of the contact devices described above, an electromagnet housed and held in the housing, and an armature housed in the housing and driven by the magnetic force of the electromagnet, and the movable contact is The fixed contact is separated from and connected to the armature.

本発明によれば、大電流が流れたときには、膨出部の一端部と他端部との間に働く斥力が、可動接点を固定接点に押し付ける方向に接点保持ばねを変形させるように作用するから、接点の開離が抑えられる。   According to the present invention, when a large current flows, the repulsive force acting between the one end and the other end of the bulging portion acts to deform the contact holding spring in a direction in which the movable contact is pressed against the fixed contact. Therefore, the contact opening is suppressed.

本発明の実施形態を示す、カバーを省略した正面図である。It is a front view which abbreviate | omitted the cover which shows embodiment of this invention. 本発明が解決すべき課題を示す説明図である。It is explanatory drawing which shows the problem which this invention should solve.

以下、本発明を実施するための最良の形態について、図面を参照しながら説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

本実施形態は、図１に示すように、電磁石１と、電磁石１の磁力により回転駆動されるアーマチュア２と、電磁石１とアーマチュア２とをそれぞれ収納し電磁石１が固定されたハウジング３とを備える。すなわち、本実施形態は、アーマチュア２の回転に伴って可動接点５１が動作する電磁リレーである。以下、上下左右は図１を基準とし、図１の紙面手前側を前側と呼ぶ。但し、上記の方向はあくまで説明の便宜上定義するものであって、実際の使用状態での方向とは必ずしも一致しない。   As shown in FIG. 1, the present embodiment includes an electromagnet 1, an armature 2 that is rotationally driven by the magnetic force of the electromagnet 1, and a housing 3 that houses the electromagnet 1 and the armature 2 and to which the electromagnet 1 is fixed. . In other words, the present embodiment is an electromagnetic relay in which the movable contact 51 operates as the armature 2 rotates. Hereinafter, the top, bottom, left, and right are based on FIG. 1, and the front side of FIG. 1 is called the front side. However, the above directions are defined for convenience of explanation and do not necessarily match the directions in the actual use state.

ハウジング３は、前面に収納凹部３０が開口したボディ３１と、ボディ３１の前側に結合して収納凹部３０を閉塞するカバー（図示せず）とを有する。   The housing 3 includes a body 31 having a housing recess 30 opened on the front surface and a cover (not shown) that is coupled to the front side of the body 31 and closes the housing recess 30.

また、本実施形態は、アーマチュア２をハウジング３に対して回転可能に支持する支持体４を備える。支持体４は、厚さ方向を前後方向に向けた扁平な形状であって左右両端部がそれぞれボディ３１に固定された固定部４１と、固定部４１の前面の中央部から前方へ突設され軸方向を前後方向に向けた円柱形状の軸部４２とを有する。固定部４１をボディ３１に固定する手段としては、例えば嵌合などの周知の手段を用いることができる。また、アーマチュア２には、断面円形状であって内径が軸部４２の外径よりも僅かに大きい軸受け穴２０が前後に貫設されており、軸受け穴２０に軸部４２が挿入されることで、アーマチュア２はハウジング３に対して軸部４２の中心軸周りに回転可能に支持される。   Moreover, this embodiment is provided with the support body 4 which supports the armature 2 rotatably with respect to the housing 3. The support 4 has a flat shape with the thickness direction directed in the front-rear direction, and the left and right ends are fixed to the body 31, respectively, and the support 4 protrudes forward from the center of the front surface of the fixed portion 41. And a cylindrical shaft portion 42 having the axial direction in the front-rear direction. As means for fixing the fixing portion 41 to the body 31, for example, well-known means such as fitting can be used. Further, the armature 2 is provided with a bearing hole 20 that is circular in cross section and has an inner diameter slightly larger than the outer diameter of the shaft portion 42 in the front and rear, and the shaft portion 42 is inserted into the bearing hole 20. The armature 2 is supported so as to be rotatable around the central axis of the shaft portion 42 with respect to the housing 3.

また、電磁石１は、軸方向を上下方向に向けて固定部４１の後側においてボディ３１に固定されたコイル（図示せず）と、磁性体からなりコイルによって磁化される磁極片１１とを有する。磁極片１１は、コイルを上下に貫通した本体部（図示せず）と、本体部の上下両端部からそれぞれ前方に突設された可変磁極部１１ａとを有し、全体としてＵ字形状となっている。すなわち、各可変磁極部１１ａはそれぞれコイルへの通電方向に応じた極性に励磁されるのであって、その極性は可変磁極部１１ａ間で互いに異なる。ハウジング３には、それぞれ一端が上記のコイルに電気的に接続されて他端がハウジング３の左方に突出した複数本（図では３本）コイル端子６０が保持されており、コイルへの通電はコイル端子６０を通じて行うことができる。具体的には、本実施形態の電磁リレーはいわゆる２巻線ラッチング型であって、上記のコイルはタップを有しており、コイル端子６０はコイルの両端とタップとに１個ずつが電気的に接続されている。   The electromagnet 1 has a coil (not shown) fixed to the body 31 on the rear side of the fixing portion 41 with the axial direction directed in the vertical direction, and a magnetic pole piece 11 made of a magnetic material and magnetized by the coil. . The pole piece 11 has a main body portion (not shown) penetrating the coil up and down, and variable magnetic pole portions 11a projecting forward from both upper and lower end portions of the main body portion, and has a U-shape as a whole. ing. That is, each variable magnetic pole part 11a is excited to a polarity corresponding to the direction of energization of the coil, and the polarity differs between the variable magnetic pole parts 11a. The housing 3 holds a plurality of (three in the figure) coil terminals 60 each having one end electrically connected to the coil and the other end protruding to the left of the housing 3. Can be performed through the coil terminal 60. Specifically, the electromagnetic relay of this embodiment is a so-called two-winding latching type, and the coil has taps, and one coil terminal 60 is electrically connected to both ends and taps of the coil. It is connected to the.

また、アーマチュア２は、それぞれ１個ずつの可変磁極部１１ａを左右から挟む固定磁極部２１ａを、上下両端部に１組ずつ有する。固定磁極部２１ａの各組において、可変磁極部１１ａの左側の固定磁極部２１ａと可変磁極部１１ａの右側の固定磁極部２１ａとは互いに異なる極性に磁化されている。具体的には、アーマチュア２は、Ｎ極を左右方向のうち互いに共通の方向に向けた２個の永久磁石２２と、それぞれ磁性体からなり各永久磁石２２の一方ずつの極に磁着された２個の接極子２１とが、合成樹脂成型体２３にインサート成型されたものである。すなわち、各接極子２１のうち、それぞれ永久磁石２２よりも上下に突出した上下両端部が、それぞれ固定磁極部２１ａとなっている。そして、電磁石１のコイルに通電されると、可変磁極部１１ａの左右の固定磁極部２１ａのうち通電方向に応じた側の一方の固定磁極部２１ａが可変磁極部１１ａに吸引されることで、アーマチュア２はハウジング３に対しコイルへの通電方向に応じた方向に回転する。また、コイルにいったん通電されると、コイルに逆方向の電流が流されるまでは、アーマチュア２の位置（及び、これに連動する可動接点５１等の位置）は上記の永久磁石２２の磁力によって維持（ラッチング）される。   The armature 2 has one set of fixed magnetic pole portions 21a sandwiching one variable magnetic pole portion 11a from the left and right, respectively, at both upper and lower ends. In each set of fixed magnetic pole portions 21a, the fixed magnetic pole portion 21a on the left side of the variable magnetic pole portion 11a and the fixed magnetic pole portion 21a on the right side of the variable magnetic pole portion 11a are magnetized with different polarities. Specifically, the armature 2 is magnetically attached to two permanent magnets 22 having N poles oriented in a common direction among the left and right directions, and one of each permanent magnet 22 made of a magnetic material. Two armatures 21 are insert-molded in a synthetic resin molding 23. That is, of the armatures 21, the upper and lower ends projecting upward and downward from the permanent magnets 22 are respectively fixed magnetic pole portions 21 a. When the coil of the electromagnet 1 is energized, one of the left and right fixed magnetic pole portions 21a of the variable magnetic pole portion 11a is attracted to the variable magnetic pole portion 11a by one of the fixed magnetic pole portions 21a corresponding to the energization direction. The armature 2 rotates with respect to the housing 3 in a direction corresponding to the energizing direction of the coil. Further, once the coil is energized, the position of the armature 2 (and the position of the movable contact 51 and the like interlocked therewith) is maintained by the magnetic force of the permanent magnet 22 until a current in the reverse direction flows through the coil. (Latching).

さらに、ハウジング３には、上記のようなアーマチュア２の回転に連動する可動接点５１と、この可動接点５１に離接する固定接点５２とが収納されている。さらに、可動接点５１と固定接点５２とはそれぞれ１個ずつの端子板６１，６２に電気的に接続されている。すなわち、可動接点５１と固定接点５２との離接に伴って端子板６１，６２間の電気的な接続がオンオフされる。各端子板６１，６２は、それぞれ、厚さ方向を左右方向に向けた金属板からなり、上端部がハウジング３外に突出する形でハウジング３に固定されている。また、本実施形態は、下端部を端子板６１の右面に固定され上端部を下端部に対して左右に変位させるように弾性変形可能な接点保持体７を有する。すなわち、可動接点５１と固定接点５２と接点保持体７とハウジング３とで接点装置が構成されている。可動接点５１は、接点保持体７の上端部に固定されることで、固定接点５２の左側においてハウジング３に対して左右に弾性的に変位可能となっている。   Further, the housing 3 accommodates a movable contact 51 that is interlocked with the rotation of the armature 2 as described above and a fixed contact 52 that is separated from and in contact with the movable contact 51. Further, the movable contact 51 and the fixed contact 52 are electrically connected to one terminal plate 61, 62, respectively. That is, the electrical connection between the terminal boards 61 and 62 is turned on and off as the movable contact 51 and the fixed contact 52 are separated from each other. Each of the terminal plates 61 and 62 is made of a metal plate whose thickness direction is in the left-right direction, and is fixed to the housing 3 such that the upper end portion protrudes out of the housing 3. Moreover, this embodiment has the contact holding body 7 which can elastically deform so that a lower end part may be fixed to the right surface of the terminal board 61, and an upper end part may be displaced to right and left with respect to a lower end part. That is, the movable contact 51, the fixed contact 52, the contact holder 7 and the housing 3 constitute a contact device. The movable contact 51 is fixed to the upper end portion of the contact holder 7 so that it can be elastically displaced left and right relative to the housing 3 on the left side of the fixed contact 52.

また、本実施形態は、接点保持体７とアーマチュア２とに連結されることにより可動接点５１をアーマチュア２に連動させるカード８を備える。可動接点５１に接続された端子板６１は、カード８の変位を阻害しないように、カード８の進路を避けた形状とされている。アーマチュア２とカード８との連結は、アーマチュア２において右側の接極子２１の上端部に連結された連結片２４が、カード８において上下方向と前方とに開口したアーマチュア用凹部８１に挿入されることで達成されている。また、接点保持体７とカード８との連結は、接点保持体７の上端部が、カード８において上下方向と後方とに開口した接点保持体用凹部（図示せず）に挿入されることで達成されている。   In addition, the present embodiment includes a card 8 that is connected to the contact holder 7 and the armature 2 to link the movable contact 51 to the armature 2. The terminal board 61 connected to the movable contact 51 is shaped to avoid the path of the card 8 so as not to hinder the displacement of the card 8. The armature 2 and the card 8 are connected by connecting the connecting piece 24 connected to the upper end of the armature 21 on the right side of the armature 2 into the armature recess 81 opened in the vertical direction and front of the card 8. Has been achieved. Further, the contact holder 7 and the card 8 are connected by inserting the upper end of the contact holder 7 into a contact holder recess (not shown) opened in the vertical direction and rearward of the card 8. Has been achieved.

ここで、接点保持体７は、それぞれ全体として上下に長い板ばねからなる複数枚の接点保持ばね７１が、厚さ方向に重ねられるとともに上端部と下端部とにおいて互いに接合されたものである。各接点保持ばね７１は、それぞれ、右方向（すなわち可動接点５１に対して固定接点５２が位置する方向）に膨出する膨出部７１ａを、上下方向の中央部に有し、膨出部７１ａの上下両側の部位はそれぞれ平坦であって厚さ方向を左右方向に向けている。各膨出部７１ａはそれぞれ曲げ加工により形成されている。また、各膨出部７１ａはそれぞれ鈍角に曲げられた部位を介して３個の平坦な部位が互いに連結された台形状である。さらに、右側の接点保持ばね７１の膨出部７１ａの左側に形成される凹部に左側の接点保持ばね７１の膨出部７１ａが収納されるといったように、膨出部７１ａ同士は入れ子状となっている。また、互いに隣接する接点保持ばね７１の膨出部７１ａ同士の間にはそれぞれ隙間が設けられており、特に、左端の接点保持ばね７１の膨出部７１ａとその右側の接点保持ばね７１の膨出部７１ａとの間の隙間は比較的に大きくされている。   Here, the contact holding body 7 is formed by laminating a plurality of contact holding springs 71 each consisting of a plate spring that is vertically long as a whole and being joined to each other at the upper end portion and the lower end portion in the thickness direction. Each of the contact holding springs 71 has a bulging portion 71a that bulges in the right direction (that is, the direction in which the fixed contact 52 is positioned with respect to the movable contact 51) at the center in the vertical direction, and the bulging portion 71a. The portions on both the upper and lower sides are flat and the thickness direction is directed to the left and right. Each bulging portion 71a is formed by bending. Each bulging portion 71a has a trapezoidal shape in which three flat portions are connected to each other through a portion bent at an obtuse angle. Further, the bulging portions 71a are nested such that the bulging portion 71a of the left contact holding spring 71 is housed in a recess formed on the left side of the bulging portion 71a of the right contact holding spring 71. ing. In addition, gaps are provided between the bulging portions 71a of the contact holding springs 71 adjacent to each other, and in particular, the bulging portion 71a of the leftmost contact holding spring 71 and the bulging portion of the contact holding spring 71 on the right side thereof. The gap between the protruding portion 71a is relatively large.

上記構成によれば、大電流が流れたときには、膨出部７１ａの上端部と下端部とに互いに略逆向きの電流が流れることにより、膨出部７１ａの上端部と下端部との間に矢印Ａ１で示すような斥力が発生する。この斥力は、接点保持体７の上端部を矢印Ａ２で示すように下端部に対して右方に変位させる方向、すなわち、可動接点５１を固定接点５２に押し付ける方向に接点保持体７を変形させるように作用する。これにより、接点の開離が抑えられる。   According to the above configuration, when a large current flows, currents that are substantially opposite to each other flow in the upper end portion and the lower end portion of the bulge portion 71a, so that the gap between the upper end portion and the lower end portion of the bulge portion 71a is reduced. A repulsive force as indicated by an arrow A1 is generated. This repulsive force deforms the contact holding body 7 in a direction in which the upper end portion of the contact holding body 7 is displaced rightward with respect to the lower end portion as indicated by an arrow A2, that is, a direction in which the movable contact 51 is pressed against the fixed contact 52. Acts as follows. Thereby, the opening of the contact is suppressed.

また、接点保持ばね７１間（膨出部７１ａ間）に隙間が設けられているので、各接点保持ばね７１（例えば、左端の接点保持ばね７１）を適宜塑性変形させることで動作特性を調整することができる。   In addition, since a gap is provided between the contact holding springs 71 (between the bulging portions 71a), the operating characteristics are adjusted by appropriately plastically deforming each contact holding spring 71 (for example, the left-end contact holding spring 71). be able to.

なお、膨出部７１ａは、上記のように台形状とするよりも、上下両端部が互いに平行となる形状（例えば矩形状）としたほうが、上下両端部で流れる電流が完全に逆向きとなることで、上記の斥力がより強くなるから望ましい。   It should be noted that the current flowing at the upper and lower ends is completely opposite when the bulging portion 71a has a shape in which the upper and lower ends are parallel to each other (for example, a rectangular shape) rather than the trapezoidal shape as described above. This is desirable because the repulsive force becomes stronger.

また、固定接点５２側の端子板６２と、膨出部７１ａとの距離は、絶縁が確保される範囲内で可能な限り小さくすることが望ましい。例えば、膨出部７１ａの寸法をより大きくすれば接点保持ばね７１を長くすることができ、上記の端子板６２の位置をより接点保持体７に近くすれば全体としての小型化が可能となる。   Further, it is desirable that the distance between the terminal plate 62 on the fixed contact 52 side and the bulging portion 71a be as small as possible within a range in which insulation is ensured. For example, if the dimension of the bulging portion 71a is made larger, the contact holding spring 71 can be made longer, and if the position of the terminal plate 62 is made closer to the contact holding body 7, the overall size can be reduced. .

３ ハウジング
７ 接点保持体
５１ 可動接点
５２ 固定接点
６２ 端子板
７１ 接点保持ばね
７１ａ 膨出部 3 Housing 7 Contact Holder 51 Movable Contact 52 Fixed Contact 62 Terminal Board 71 Contact Holding Spring 71a Swelling Part

Claims (5)

それぞれ板ばねからなる複数個の接点保持ばねが厚さ方向に重ねられてなり一端部に可動接点を保持した接点保持体と、
前記接点保持体の他端部が固定されるとともに前記接点保持体の弾性変形によって前記可動接点が離接可能な位置に固定接点を保持したハウジングとを備え、
各接点保持ばねは、前記可動接点に対して前記固定接点が位置する方向に膨出した膨出部を有することを特徴とする接点装置。 A contact holding body in which a plurality of contact holding springs each made of a leaf spring are stacked in the thickness direction and hold a movable contact at one end;
A housing in which the other end of the contact holder is fixed and the fixed contact is held at a position where the movable contact can be detached by elastic deformation of the contact holder,
Each contact holding spring has a bulging portion that bulges in a direction in which the fixed contact is positioned with respect to the movable contact. 少なくとも１個の前記接点保持ばねについて、前記膨出部と、隣接する他の前記接点保持ばねとの間には、隙間が設けられていることを特徴とする請求項１記載の接点装置。   The contact device according to claim 1, wherein a gap is provided between the bulging portion and another adjacent contact holding spring with respect to at least one of the contact holding springs. 各膨出部はそれぞれ角状に曲げられた部位を介して互いに連結された複数個の平坦な部位からなることを特徴とする請求項１又は請求項２記載の接点装置。   3. The contact device according to claim 1, wherein each of the bulging portions includes a plurality of flat portions connected to each other through portions bent in a square shape. 前記固定接点に電気的に接続されて一部が前記ハウジング外に突出する形で前記ハウジングに保持された端子板を備え、
前記膨出部は、前記端子板の近傍に位置することを特徴とする請求項１〜３のいずれか１項に記載の接点装置。 A terminal plate that is electrically connected to the fixed contact and is held by the housing in such a manner that a part projects out of the housing;
The contact device according to claim 1, wherein the bulging portion is located in the vicinity of the terminal plate. 請求項１〜４のいずれか１項に記載の接点装置と、
前記ハウジングに収納及び保持された電磁石と、
前記ハウジングに収納されて前記電磁石の磁力によって駆動されるアーマチュアとを備え、
前記可動接点は、前記アーマチュアに連動して前記固定接点に対して離接することを特徴とする電磁リレー。 The contact device according to any one of claims 1 to 4,
An electromagnet housed and held in the housing;
An armature housed in the housing and driven by the magnetic force of the electromagnet,
The electromagnetic relay according to claim 1, wherein the movable contact is separated from and connected to the fixed contact in conjunction with the armature.
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