EP2551868B1 - Contact device and electromagnetic relay including same - Google Patents

Contact device and electromagnetic relay including same Download PDF

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Publication number
EP2551868B1
EP2551868B1 EP20120174868 EP12174868A EP2551868B1 EP 2551868 B1 EP2551868 B1 EP 2551868B1 EP 20120174868 EP20120174868 EP 20120174868 EP 12174868 A EP12174868 A EP 12174868A EP 2551868 B1 EP2551868 B1 EP 2551868B1
Authority
EP
European Patent Office
Prior art keywords
contact point
housing
bulging portion
armature
fixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP20120174868
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2551868A1 (en
Inventor
Akihiro Okuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Panasonic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=46582558&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2551868(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2551868A1 publication Critical patent/EP2551868A1/en
Application granted granted Critical
Publication of EP2551868B1 publication Critical patent/EP2551868B1/en
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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

Definitions

  • the present invention relates to a contact device and an electromagnetic relay using the contact device.
  • a contact device in which, as shown in Fig. 2 , a movable contact point 51 is held by a contact point retaining spring 71 formed of a leaf spring and can be displaced with respect to a fixed contact point 52 by the elastic deformation of the contact point retaining spring 71 (see, e.g., Japanese Utility Model Application Publication No. S63-37052 ).
  • This contact device is used in, e.g., an electromagnetic relay in which the movable contact point 51 is driven by the magnetic force of an electromagnet.
  • Document EP 2385 536 A1 having a priority date before the priority date of the application being published only after the priority date of the present invention, discloses an electrical switching device including a base terminal and a movable terminal which magnetic separation force between the base and movable terminals is reduced by a magnetic shield.
  • WO 2010/090618 A2 discloses an electromagnetic relay, which enables current to pass through switch termini, comprising a coil assembly, a rotor or bridge assembly, and a switch assembly.
  • the present invention provides a contact device according to claim 1 capable of restraining opening of contact points which may be caused by a large current and an electromagnetic relay using the contact device and an electromagnetic relay comprising such contact device.
  • a contact device including: a contact point retainer configured to hold a movable contact point in one end portion thereof, the contact point retainer including a plurality of contact point retaining springs superimposed in a thickness direction and formed of leaf springs; and a housing configured to fix the other end portion of the contact point retainer and hold a fixed contact point in a position where the movable contact point can come into contact with or out of contact with the fixed contact point in response to elastic deformation of the contact point retainer, wherein each of the contact point retaining springs includes a bulging portion swelling away in a direction parallel or substantially parallel to a direction from the movable contact point and toward the fixed contact point.
  • a gap may exist between the bulging portion of at last one of the contact point retaining springs and the bulging portion of the contact point retaining spring adjoining to said at least one of the contact point retaining springs.
  • the bulging portion may include a plurality of flat sections connected to one another through angularly bent sections.
  • the bulging portion may include upper and lower sections extending parallel to each other.
  • the device described above may further include a terminal plate electrically connected to the fixed contact point and held in the housing in such a fashion as to partially protrude outside the housing, the bulging portion positioned near the terminal plate.
  • An electromagnetic relay may include the contact device described above; an electromagnet stored and held within the housing; and an armature stored within the housing and driven by a magnetic force of the electromagnet, wherein the movable contact point is configured to move together with the armature and to come into contact with or out of contact with the fixed contact point.
  • the repulsion force generated between one end and the other end of the bulging portion acts to deform the contact point retaining spring in such a direction as to press the movable contact point against the fixed contact point. It is therefore possible to restrain opening of the contact points.
  • an electromagnetic relay 100 includes an electromagnet 1, an armature 2 rotationally driven by the magnetic force of the electromagnet 1 and a housing 3 for accommodating the electromagnet 1 and the armature 2.
  • the electromagnet 1 is fixed to the housing 3.
  • the present embodiment is directed to the electromagnetic relay 100 in which the movable contact point 51 is operated in response to the rotation of the armature 2.
  • the upper, lower, left and right sides will be defined on the basis of Fig. 1 .
  • the front side of the drawing sheet in Fig. 1 will be called “front” and the back side of the drawing sheet in Fig. 1 will be called “rear".
  • these directions are defined just for the sake of convenience in description and may not conform to the directions under an actual use condition.
  • the housing 3 includes a body 31 having a storage recess 30 whose front side is opened and a cover (not shown) coupled to the front side of the body 31 to close the storage recess 30.
  • the electromagnetic relay 100 includes a support body 4 for rotatably supporting the armature 2 with respect to the housing 3.
  • the support body 4 includes a flat fixing portion 41 whose thickness direction extends in the front-rear direction and whose left-right end portions are fixed to the body 31 and a cylindrical columnar shaft portion 42 protruding frontward from a central area of a front surface of the fixing portion 41.
  • the axial direction of the shaft portion 42 extends in the front-rear direction.
  • the armature 2 has a bearing hole 20 with a circular cross section. The bearing hole 20 extends through the armature 2 in the front-rear direction.
  • the inner diameter of the bearing hole 20 is a little larger than the outer diameter of the shaft portion 42.
  • the shaft portion 42 is inserted into the bearing hole 20, whereby the armature 2 is supported with respect to the housing 3 so as to rotate about the center axis of the shaft portion 42.
  • the electromagnet 1 includes a coil (not shown) fixed to the body 31 at the rear side of the fixing portion 41 such that the axial direction thereof extends in the up-down direction and a magnetic pole piece 11 made of a magnetic material and magnetized by the coil.
  • the magnetic pole piece 11 includes a body portion (not shown) extending through the coil in the up-down direction and variable magnetic pole portions 11a protruding frontward from the upper and lower ends of the body portion.
  • the magnetic pole piece 11 has a substantially U-like shape as a whole. More specifically, the variable magnetic pole portions 11a are magnetized into different polarities depending on the flow direction of an electric current supplied to the coil. The polarities of the variable magnetic pole portions 11a differ from each other.
  • coil terminals 60 are held in the housing 3.
  • the coil terminals 60 are electrically connected to the coil at one ends thereof.
  • the other ends of the coil terminals 60 protrude toward the left side of the housing 3.
  • An electric current is fed to the coil through the coil terminals 60.
  • the electromagnetic relay 100 according to the present embodiment is of a so-called two-coil latch type.
  • the coil is provided with a tap.
  • the coil terminals 60 are electrically connected to the opposite ends and the tap of the coil.
  • the armature 2 includes two pairs of fixed magnetic pole portions 21a, which are respectively provided at the upper and lower end portions thereof. Each of the variable magnetic pole portions 11a is interposed between each pair of the fixed magnetic pole portions 21a. In each pair of the fixed magnetic pole portions 21a, the fixed magnetic pole portion 21a existing at the left side of the variable magnetic pole portions 11a and the fixed magnetic pole portion 21a existing at the right side of the variable magnetic pole portions 11a are magnetized with different polarities. More specifically, the armature 2 includes two permanent magnets 22 whose N-poles are oriented in the same left or right direction, two armature members 21 made of a magnetic material and a synthetic-resin molded body 23 with which the permanent magnets 22 and the armature members 21 are insert-molded. Each of the armature members 21 is magnetically attached to the pole of each of the permanent magnets 22. The opposite end portions of each of the armature members 21 protruding upward and downward beyond each of the permanent magnets 22 serve as the fixed magnetic pole portions 21a.
  • a movable contact point 51 moving together with the rotation of the armature 2 and a fixed contact point 52 coming into contact with or out of contact with the movable contact point 51 are stored within the housing 3.
  • the movable contact point 51 and the fixed contact point 52 are electrically connected to terminal plates 61 and 62, respectively.
  • the electric connection between the terminal plates 61 and 62 is switched on and off as the movable contact point 51 comes into contact with or out of contact with the movable contact point 51.
  • Each of the terminal plates 61 and 62 is formed of a metal plate with the thickness direction thereof extending in the left-right direction.
  • Each of the terminal plates 61 and 62 is fixed to the housing 3 in such a fashion that the upper end portion thereof protrudes outside the housing 3.
  • the electromagnetic relay 100 includes a contact point retainer 7.
  • the lower end portion of the contact point retainer 7 is fixed to a right surface of the terminal plate 61 and the upper end portion of the contact point retainer 7 is elastically deformable to be displaced in the left-right direction with respect to the lower end portion of the contact point retainer 7.
  • the movable contact point 51, the fixed contact point 52, the contact point retainer 7 and the housing 3 make up a contact device.
  • the movable contact point 51 is fixed to the upper end portion of the contact point retainer 7, so that the movable contact point 51 can be elastically displaced in the left-right direction with respect to the housing 3 at the left side of the fixed contact point 52.
  • the electromagnetic relay 100 includes a card 8 connected to the contact point retainer 7 and the armature 2 so that the movable contact point 51 can move together with the armature 2.
  • the terminal plate 61 connected to the movable contact point 51 is shaped not to interfere with the moving path of the card 8 so that the terminal plate 61 should not hinder the displacement of the card 8.
  • the armature 2 and the card 8 are connected to each other by inserting the connector piece 24 connected to the upper end portion of the right armature member 21 of the armature 2 into an armature recess portion 81 of the card 8 opened upward, downward and frontward.
  • the contact point retainer 7 and the card 8 are connected to each other by inserting the upper end portion of the contact point retainer 7 into a recess portion (not shown) of the card 8 opened upward, downward and rearward.
  • the contact point retainer 7 includes a plurality of contact point retaining springs 71, each of which is formed of a leaf spring extending in the up-down direction.
  • the contact point retaining springs 71 are superimposed in the thickness direction and are bonded to one another at the upper end portions and the lower end portions thereof.
  • Each of the contact point retaining springs 71 includes a bulging portion 71a swelling rightward (namely, in a parallel or substantially parallel direction to the direction from the movable contact point 51 toward the fixed contact point 52).
  • the bulging portion 71a is formed in a substantially central portion of each of the contact point retaining springs 71 in the up-down direction.
  • each of the contact point retaining springs 71 existing above and below the bulging portion 71a are flat with the thickness direction thereof extending in the left-right direction.
  • the bulging portion 71a is formed by a bending work.
  • the bulging portion 71a has, e.g., a trapezoidal shape, and includes three flat sections connected to one another through bent sections bent at an obtuse angle.
  • the bulging portions 71a of the contact point retaining springs 71 are formed into a box-like shape so that the bulging portion 71a of the left contact point retaining spring 71 can be received in the left recess of the bulging portion 71a of the right left contact point retaining spring 71.
  • the gap existing between the bulging portion 71a of the leftmost contact point retaining spring 71 and the bulging portion 71a of the contact point retaining spring 71 adjoining to the leftmost contact point retaining spring 71 is formed into a relatively large size.
  • the operation characteristics can be adjusted by plastically deforming the respective contact point retaining springs 71 (e.g., the leftmost contact point retaining spring 71) in an appropriate manner.
  • the bulging portion 71a into a shape (e.g., a rectangular shape) in which the upper and lower sections thereof extend parallel to each other, than to form the bulging portion 71a into the trapezoidal shape described above. In that case, the electric currents flow through the upper and lower sections of bulging portion 71a in the perfectly opposite directions and the repulsion force becomes stronger.
  • the bulging portion 71a is positioned near the terminal plate 62.
  • the distance between the terminal plate 62 existing at the side of the fixed contact point 52 and the bulging portion 71a is set as small as possible insofar as the insulation can be secured.
  • the size of the bulging portion 71a is made larger, it becomes possible to make the contact point retaining springs 71 longer. If the position of the terminal plate 62 is set closer to the contact point retainer 7, it becomes possible to reduce the overall size of the electromagnetic relay 100.
EP20120174868 2011-07-27 2012-07-04 Contact device and electromagnetic relay including same Revoked EP2551868B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011164192A JP5923749B2 (ja) 2011-07-27 2011-07-27 接点装置及び該接点装置を用いた電磁リレー

Publications (2)

Publication Number Publication Date
EP2551868A1 EP2551868A1 (en) 2013-01-30
EP2551868B1 true EP2551868B1 (en) 2015-02-25

Family

ID=46582558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120174868 Revoked EP2551868B1 (en) 2011-07-27 2012-07-04 Contact device and electromagnetic relay including same

Country Status (3)

Country Link
EP (1) EP2551868B1 (ja)
JP (1) JP5923749B2 (ja)
CN (1) CN102903575B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014112011A1 (de) * 2014-08-21 2016-03-17 Johnson Electric Germany GmbH & Co. KG Bistabiles Kleinrelais großer Leistung

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Publication number Priority date Publication date Assignee Title
JP6135168B2 (ja) 2013-02-13 2017-05-31 オムロン株式会社 電磁継電器
EP2782110B1 (en) * 2013-03-22 2017-07-05 Tyco Electronics Austria GmbH Lorentz force activated electric switching device
EP2806441B1 (en) * 2013-05-24 2017-07-12 Tyco Electronics Austria GmbH Electric switching device with enhanced Lorentz force bias
JP6393025B2 (ja) 2013-07-01 2018-09-19 富士通コンポーネント株式会社 電磁継電器
GB2520572A (en) * 2013-11-26 2015-05-27 Johnson Electric Sa Electrical Contactor
JP5954391B2 (ja) * 2014-11-27 2016-07-20 オムロン株式会社 接触片ユニット及びリレー
JP5930092B1 (ja) * 2015-03-19 2016-06-08 オムロン株式会社 リレー
CN106158513B (zh) * 2015-04-15 2018-10-19 浙江正泰电器股份有限公司 磁保持继电器的外壳结构
CN105551896B (zh) * 2015-12-22 2018-07-27 厦门宏发电力电器有限公司 一种接触组件及其高压直流继电器
JP6726156B2 (ja) * 2017-12-04 2020-07-22 富士通コンポーネント株式会社 電磁継電器
JP6732986B2 (ja) * 2019-03-22 2020-07-29 富士通コンポーネント株式会社 電磁継電器

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JP2881674B2 (ja) 1993-05-27 1999-04-12 株式会社牧野フライス製作所 送り装置
DE10162585C1 (de) * 2001-12-19 2003-04-24 Gruner Ag Prellreduziertes Relais
JP2006032131A (ja) * 2004-07-16 2006-02-02 Matsushita Electric Works Ltd 接点機構およびそれを用いるパワーリレー
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CN201112292Y (zh) * 2007-06-06 2008-09-10 浙江中孚电子有限公司 一种控制用磁保持继电器
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CN201549449U (zh) * 2009-12-01 2010-08-11 李健全 一种单相磁保持继电器
US8330564B2 (en) * 2010-05-04 2012-12-11 Tyco Electronics Corporation Switching devices configured to control magnetic fields to maintain an electrical connection
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014112011A1 (de) * 2014-08-21 2016-03-17 Johnson Electric Germany GmbH & Co. KG Bistabiles Kleinrelais großer Leistung

Also Published As

Publication number Publication date
CN102903575B (zh) 2016-03-16
JP2013030310A (ja) 2013-02-07
CN102903575A (zh) 2013-01-30
EP2551868A1 (en) 2013-01-30
JP5923749B2 (ja) 2016-05-25

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