EP0089625B1 - Appareil pour transmettre des courants électriques entre des parties mutuellement pivotables - Google Patents

Appareil pour transmettre des courants électriques entre des parties mutuellement pivotables Download PDF

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Publication number
EP0089625B1
EP0089625B1 EP83102635A EP83102635A EP0089625B1 EP 0089625 B1 EP0089625 B1 EP 0089625B1 EP 83102635 A EP83102635 A EP 83102635A EP 83102635 A EP83102635 A EP 83102635A EP 0089625 B1 EP0089625 B1 EP 0089625B1
Authority
EP
European Patent Office
Prior art keywords
housing
ball bearings
shaft
bearing bushes
axial
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.)
Expired
Application number
EP83102635A
Other languages
German (de)
English (en)
Other versions
EP0089625A1 (fr
Inventor
Klaus Ing.-Grad. Barthelt
Kurt Dollhofer
Ludwig Rauh
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.)
Schleifring und Apparatebau GmbH
Original Assignee
Schleifring und Apparatebau GmbH
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
Application filed by Schleifring und Apparatebau GmbH filed Critical Schleifring und Apparatebau GmbH
Priority to AT83102635T priority Critical patent/ATE17417T1/de
Publication of EP0089625A1 publication Critical patent/EP0089625A1/fr
Application granted granted Critical
Publication of EP0089625B1 publication Critical patent/EP0089625B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/64—Devices for uninterrupted current collection
    • H01R39/643—Devices for uninterrupted current collection through ball or roller bearing

Definitions

  • the invention relates to a device for transmitting electrical currents between mutually rotatable parts.
  • slip ring transmitters are mostly used for this, i.e. Devices in which brushes, in particular carbon brushes, slide on annular slideways made of highly conductive material. These slip ring transmitters have the disadvantage that the brushes, which are made of soft material, are subject to high wear. In order to achieve low wear and thus a long service life even at high speeds, attempts have already been made to use radial ball bearings for power transmission. However, it was found that the internal clearance leads to brief interruptions, so that there is a high level of noise in the case of measuring currents and a disruptive spark formation which increases wear and tear.
  • DE-B No. 1152459 describes a device of the type mentioned at the outset with a plurality of current-transmitting axial ball bearings which are arranged one above the other in the axial direction in a housing coaxially with a component which can be rotated relative to the housing, in each case between the facing ones with electrical ones Feed lines connected bearing shells of two adjacent axial ball bearings are arranged in the axial direction insulating rings, and the contact pressure is caused by a spring element arranged at one end of the housing, which is common to all axial ball bearings, and in which the bearing shells and the balls consist of electrically conductive material.
  • this known device does not yet eliminate all the disadvantages of the devices with radial ball bearings, since the mounting of the parts which can be rotated relative to one another is not separated from the parts used for power transmission, which means that external loads have an influence on the power transmission.
  • US-A No. 2523081 describes a device for transmitting electrical currents between mutually rotatable parts, in which the current is transmitted via so-called inclined shoulder ball bearings, which have similar disadvantages to the radial ball bearings mentioned above, in that the ball rests only at one point . Furthermore, this device has the disadvantage that a separate spring is required for each bearing in order to generate the necessary contact pressure.
  • US-A No. 1821132 describes a rotary connection for electrical cables, in which an axial ball bearing is also used, the bearing surface of which has a V-shaped recess. However, due to its construction, this device is not suitable for the transmission of multiple current paths.
  • the invention had for its object to improve a device for transmitting electrical currents between mutually rotatable parts of the type described in the first place and in the preamble of claim 1 so that the quality of the power transmission is independent of external loads, and a trouble-free power transmission of several transmission paths is achieved in the smallest of spaces with the lowest losses. Furthermore, the device should be constructed in such a way that manufacturing and assembly tolerances effective in the axial and radial directions have no influence on the current transmission.
  • the component which can be rotated against the housing is designed as a housing arranged in the housing, which is mounted in the housing via all radial ball bearings which absorb forces between the housing and the shaft, and the insulating rings are arranged in such a way that they alternate with each other an insulating ring inserted into the housing and connected to it in a rotationally fixed manner is followed by an insulating ring which is pushed onto the shaft and connected to it in a rotationally fixed manner, and the bearing shells which have a V-shaped recess and the balls consist of a silver alloy and are coated with material consisting of nitrides or containing nitrides are and the bearing pressure of the axial ball bearing is adjustable.
  • two rotating bearing shells and two fixed bearing shells are mechanically connected to one another via an insulating ring due to the special arrangement of the insulating rings.
  • This arrangement allows almost unlimited transmission paths to be attached.
  • the insulating rings in the housing which is displaceable in the axial direction, a quasi-flying construction is achieved, with the result that effective manufacturing and assembly tolerances in the axial and radial directions are negligible.
  • the exact setting of the contact pressure enables an intervention in the service life of the rotating parts.
  • the type of structure also does not require fixed flanges, but only a supporting edge and, since only small forces occur in the tangential direction, only simple drivers.
  • the bearing shells which are provided with a V-shaped recess in a manner known per se, ensure that each ball rests at two defined points in the ring, thereby ensuring improved contact transmission.
  • Elastizi module Three material properties were important for the selection of the material from which the bearing shells and balls should be made, namely Elastizi module, surface hardness and conductivity.
  • Materials with high conductivity, i.e. low specific resistance, are generally soft and plastically deformable, while materials with a high modulus of elasticity and high hardness, on the other hand, usually have a high specific resistance.
  • silver alloys are particularly suitable because they combine a high modulus of elasticity and a relatively high surface hardness with a relatively high conductivity.
  • Alloys of silver with copper or beryllium or with both metals are particularly suitable. For example, a material combination of work hardened 835 silver with silver balls hardened with 3% copper has proven to be advantageous.
  • the shaft 10 is rotatably supported in a housing 12 by means of the radial ball bearings 19, 20.
  • the ball bearings 19, 20 can be any known ball bearings that absorb all the forces that occur between the housing 12 and the shaft 10.
  • a second housing 15 is inserted into the housing 12 and fastened by means of a flange.
  • the insulating rings 3 are used, which support the bearing shells 1 b of axial bearings. Insulating rings 2, which carry the other bearing shells 1 of the axial bearings, are also pushed onto the shaft 10. With this arrangement, the insulating rings 3 are connected to the housing 15 in a rotationally fixed manner and the insulating rings 2 are connected to the shaft 10 in a rotationally fixed manner.
  • the ball bearing balls 25 are located between these bearing shells 1a, 1b.
  • a part of the axial bearing is shown in FIG. 2, wherein it can be seen that the bearing shells 1 a and 1 b have V-shaped recesses 24.
  • the bearing shells 1 b connected to the housing 15 are connected to the electrical feed lines 8 and the bearing shells 1 a connected to the shaft 10 are connected to the feed lines 9.
  • six axial bearings are used which are separated from one another by the insulating rings 2, 3, six currents can be transmitted independently of one another.
  • the insulating rings 3 and 2 are inserted alternately into the housing 15. This structure allows an almost unlimited number of transmission paths to be provided by lining up a large number of axial bearings.
  • ball holders 27 can be provided in a manner known per se, which, however, in contrast to the conventional ball holders, do not consist of metal but of plastic. With these ball holders, the balls 25 can be kept at a distance without wear. This makes it possible to accommodate several balls, which means that the current to be transmitted can be increased in a small size. Due to the difference in the circumferential speeds of the inner and outer track on the V-shaped recesses, the contact surfaces between the balls and the bearing shells are self-cleaning, while contaminants that would impair contact are deposited in the valley bottom of the V-shaped recesses, which does not serve as a contact surface can.

Landscapes

  • Support Of The Bearing (AREA)
  • Rolling Contact Bearings (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Claims (2)

1. Dispositif destiné à la transmission de courants électriques entre des pièces pouvant être mises en rotation les unes par rapport aux autres et comportant plusieurs paliers à billes axiaux (1 a-1 b) transmetteurs de courant, qui sont disposés les uns au-dessus des autres en direction axiale dans un boîtier (15), coaxialement à l'élément constitutif (10) pouvant tourner par rapport au boîtier, entre chacune des cages de roulement (1 a-1 a, 1 b-1 b) appartenant à deux paliers à billes adjacents, tournées en regard mutuel et connectées à des conducteurs électriques d'amenée, étant disposées des bagues isolantes (2, 3) déplaçables en direction axiale, et la pression de contact étant assurée par un élément à ressort (22) disposé à une extrémité du boîtier (15) et actif conjointement pour tous les paliers à billes axiaux, et dans lequel les cages de roulement (1 a, 1 b) ainsi que les billes (25) sont constituées en un matériau conducteur électrique, caractérisé par le fait que l'élément constitutif pouvant tourner par rapport au boîtier (15) est agencé sous la forme d'un arbre (10) qui est disposé dans le boîtier et monté dans ledit boîtier (15) par l'intermédiaire de paliers à billes radiaux (19,20) absorbant tous les efforts produits entre le boîtier et l'arbre, que les bagues isolantes (3, 2) sont disposées de façon qu'alternativement à chaque bague isolante (3) insérée dans le boîtier (15) et solidarisée en rotation à celui-ci, succède une bague isolante enfilée sur l'arbre (10) et solidaire en rotation de celui-ci, les cages de roulement (1 a, 1 b) présentant une rainure en forme de V (24) ainsi que les billes (25) sont constituées en un alliage d'argent et sont revêtues d'un matériau composé de nitrures ou renfermant des nitrures, et la pression d'appui des paliers à billes axiaux est réglable.
2. Dispositif selon la revendication 1, caractérisé par le fait que dans chaque palier à billes axial est disposé un support de billes (27) constitué en matière plastique pour le support de plusieurs billes (25) à intervalles fixes.
EP83102635A 1982-03-20 1983-03-17 Appareil pour transmettre des courants électriques entre des parties mutuellement pivotables Expired EP0089625B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83102635T ATE17417T1 (de) 1982-03-20 1983-03-17 Vorrichtung zur uebertragung elektrischer stroeme zwischen gegeneinander verdrehbaren teilen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823210334 DE3210334A1 (de) 1982-03-20 1982-03-20 Vorrichtung zur uebertragung elektrischer stroeme zwischen gegeneinander verdrehbaren teilen
DE3210334 1982-03-20

Publications (2)

Publication Number Publication Date
EP0089625A1 EP0089625A1 (fr) 1983-09-28
EP0089625B1 true EP0089625B1 (fr) 1986-01-08

Family

ID=6158879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83102635A Expired EP0089625B1 (fr) 1982-03-20 1983-03-17 Appareil pour transmettre des courants électriques entre des parties mutuellement pivotables

Country Status (3)

Country Link
EP (1) EP0089625B1 (fr)
AT (1) ATE17417T1 (fr)
DE (2) DE3210334A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3607928B2 (ja) * 2001-01-31 2005-01-05 ビー・エル・オートテック株式会社 ロータリジョイント
US7854615B1 (en) 2010-04-30 2010-12-21 Lincoln Global, Inc. Rotational connector for welding torch
GB2532802B (en) * 2014-11-29 2017-03-29 Orange Music Electronic Company Ltd Rotatable Coupling for Audio Cables
CN111313199B (zh) * 2020-03-11 2021-08-24 北京理工大学 一种柔性滚动体径向面接触滑环
CN111370958B (zh) * 2020-03-11 2021-04-02 北京理工大学 一种柔性滚动体轴向面接触滑环
CN111162422B (zh) * 2020-03-11 2020-12-11 北京理工大学 一种柔性接触电极轴向面接触滑环

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1821132A (en) * 1927-10-31 1931-09-01 Baker Charles Goater Swivel connection for electric cables and the like
US2523081A (en) * 1947-08-15 1950-09-19 Gen Electric Gyroscope electrical connection apparatus
DE1152459B (de) * 1954-09-27 1963-08-08 Karl Mohr Leitungskupplung mit konzentrisch zueinander liegenden und relativ zueinander drehbaren Bauteilen fuer Mehrphasenstrom
NL147888B (nl) * 1971-11-26 1975-11-17 Cornelis Hendrik Van Toorn Draaibaar elektrisch verbindingsorgaan, waarvan de stroomoverbrengende kogels zijn opgesloten tussen magneetpolendragende schijfelektroden.
US3940200A (en) * 1975-03-04 1976-02-24 Schreffler Robert Z Electrical conductor arrangement including flexible race construction

Also Published As

Publication number Publication date
DE3210334A1 (de) 1983-09-29
DE3361753D1 (en) 1986-02-20
ATE17417T1 (de) 1986-01-15
EP0089625A1 (fr) 1983-09-28

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