EP0102378B1 - Herstellungsverfahren für kommutatoren - Google Patents

Herstellungsverfahren für kommutatoren Download PDF

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Publication number
EP0102378B1
EP0102378B1 EP83900915A EP83900915A EP0102378B1 EP 0102378 B1 EP0102378 B1 EP 0102378B1 EP 83900915 A EP83900915 A EP 83900915A EP 83900915 A EP83900915 A EP 83900915A EP 0102378 B1 EP0102378 B1 EP 0102378B1
Authority
EP
European Patent Office
Prior art keywords
commutator
elements
material member
plough
ploughing
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
EP83900915A
Other languages
English (en)
French (fr)
Other versions
EP0102378A1 (de
Inventor
Leif Hansen
Bjarne Ulrich Gorm Nyenstad
Torben Clausen Wrang
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.)
Thrige-Titan AS
Original Assignee
Thrige-Titan AS
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 Thrige-Titan AS filed Critical Thrige-Titan AS
Priority to AT83900915T priority Critical patent/ATE21192T1/de
Publication of EP0102378A1 publication Critical patent/EP0102378A1/de
Application granted granted Critical
Publication of EP0102378B1 publication Critical patent/EP0102378B1/de
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
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/06—Manufacture of commutators
    • H01R43/08—Manufacture of commutators in which segments are not separated until after assembly

Definitions

  • the present invention relates to a method of manufacturing commutators of the type comprising a row of mutually separated commutator elements having an exposed commutator side and an opposite side shaped with integral undercut protruding portions forming anchoring elements, which are secured to a cast commutator body, whereby the row of commutator elements is produced from an elongate unitary material member, which is machined on one side for the shaping of the said anchoring elements and is thereafter, upon being connected to or having cast therein said cast commutator body, divided into said row of separate commutator elements by way of transverse cuttings between the consecutive anchoring element carrying portion of the material member.
  • the commutator elements as loose members are laid into a mounting ring to form a cylindrical row of elements each of these elements having an inwardly directed side with integral protruding portions to form anchoring elements for the commutator body.
  • the cast commutator body is placed into the cylindrical row of elements whereafter this row is cut for the mutual separation of the commutator elements.
  • the mounting of the loose commutator elements is a time consuming work, which has proved difficult to automatize, but the achievable quality of the commutators produced in this manner is very high, primarily due to the fact that the anchoring elements may show a high degree of rigidity or stability, when they are formed - in any of several possible manners - on the single commutator elements, these elements basically being cut from a profiled rod of a suitable material, normally copper.
  • a method of the above kind is disclosed in GB-A 2,049,496 wherein a flat strip of copper is machined to a row of transverse alternate grooves and ribs, whereafter the opposed ends of the ribs are subjected to the action of wedge shaped skiving knives operating to cut the end portions of the ribs free of the underlying strip material and bend the end portions outwardly therefrom, thus leaving the strip with a row of parallel anchoring elements each constituted by a rib member, a middle portion of which is integrally associated with the strip material, while both end portions thereof are diverging from the surface of the copper strip.
  • the strip is rolled into a cylindrical member with the said ribs located at the inner side thereof, and the cylinder is filled by a casting material, which intrudes into the wedge shaped spaces between the bent out rib end portions and their underlying (or now rather outerlying) strip surface portions.
  • the strip material is cut away between the neighbouring rib carrying portions leaving these portions as individual commutator segments each anchored to the casting material by the latter being present inside and outside the bent-out end portions of the ribs.
  • the anchoring effect as hereby obtained is not particularly qualified, because the anchoring elements are associated with the respective commutator elements over a limited middle area only, just as the bent out rib end portions are not ideal for anchoring the commutator elements against high centrifugal forces.
  • This design has proved to provide for a high quality anchoring of the commutator elements.
  • the invention provides a method of the above-mentioned kind wherein the anchoring elements are produced by subjecting the relevant side of the elongate unitary material member to a transverse plough-up action by means of undercutting ploughing tool means causing the surface material of the material member to be locally displaced generally outwardly from and upwardly along the opposite sides of the ploughing tool means, whereby the material thus displaced forms an obliquely upstanding undercut rib portion located so as to constitute, together with a corresponding oppositely oblique neighbouring rib portion, the anchoring element of a commutator element as subsequently formed by said transverse cutting.
  • the mechanical anchoring element forming treatment is carried out by a transverse ploughing up action on or in the relevant surface of the material member, whereby oblique anchor rib portions are formed by the displaced material, and these rib portions will be very ductile and strong, because they emanate from a compression action on the material.
  • the preferred material is conventional commutator copper, i.e. practically pure copper, which preserves or even builds up a high strength when subjected to a cold compression deformation, which will here apply also to the root area of the rib portions.
  • anchor ribs When the anchor ribs are produced by means of an undercutting ploughing tool they will be left slanting towards each other, while in a commonly preferred shape of the anchor element two oblique ribs are arranged V-like, i.e. slanting away from each other.
  • the ploughing action may be effected in a raised portion of the material member located spaced from the side edges thereof, whereby the resulting commutator elements will be provided with anchoring elements along only a partial length thereof, which is desirable for the longitudinal anchoring of the commutator elements in the cast commutator body.
  • the material member may be a straight profile, which is rolled up subsequent to the ploughing treatment, or it may be a cylindrical member, preferably made as a rolled up profile, which is subjected to the ploughing treatment in its cylindrical shape.
  • the plough up action may be effected stepwise by means of a single tool, or a multiple tool may be used. It is particularly advantageous to use two opposite multiple tools, which are mutually staggered and forced into the material member simultaneously from both edges thereof, thereby the material member will need no rigid holding means, as the forces applied from both sides will neutralize each other.
  • the material member shown in Fig. 1 is a copper strip 2, which is profiled, by rolling or otherwise, so as to show a broad base portion 4 and a raised flat portion 6 of reduced width.
  • This strip member which may be supplied from a supply reel, is advanced stepwise through the working station as illustrated in Figs. 2 and 3, in which the strip 2 is supported by a carrier sole 8 and is subjected to the transverse action of a ploughing tool 10, the active part of which is an undercut plough shear 12, the front end of which is ground so as to form an undercut ploughing point or edge 14, the front point of which is located in the level of the planar underside of the plough shear 12.
  • the tool 10 is forced laterally against the raised material portion 6 with the surface of the plough shear 12 in level with or slightly spaced from the top side of the broad portion 4 of the strip 2.
  • the tool will cause a furrow 16 (Fig. 3) to be ploughed in the material portion 6, because the copper will be forcibly displaced transversely by the sides of the tool front 14 to flow upwardly along the undercut opposite sides of the plough shear 12 and outwardly therefrom, to form obliquely-upstanding undercut raised anchoring ribs 18 projecting beyond the top level of the profile portion 6 on each side of the furrow 16.
  • the tool 10 When the shear 12 has thus ploughed through the entire profile portion 6 the tool 10 is retracted and the material strip 2 is advanced a step corresponding to the desired pitch between the neighbouring commutator elements of the final product, whereafter the tool is reactuated.
  • the strip member 2 will leave the working station with a length profile as shown to the left in Fig. 3, i.e. with the profile portion 6 converted into a row of V-shaped protrusions 20 forming the anchoring elements of the later commutator elements.
  • this cylindrical member is designated 24 and its join 26.
  • the join 26 is located midways between two anchoring protrusions 20.
  • a rigid body 28, Fig. 5 is produced by casting into the internal space of the cylindrical member 24, and, if applicable, about a central bushing 30, whereby the casting of the body 28 will provide for a strong radial holding engagement between the undercut anchoring elements 20 and the casting material.
  • a corresponding axial anchoring is obtained in that the body 28 is provided with a width broader than that of the raised profile portion 6, i.e. larger than the length of the anchoring elements 20.
  • slots 34 are cut through the cylindrical body, whereby the commutator cylinder member 24 is divided into a row of mutually insulated commutator elements, each anchored to the body 28 by means of the associated anchoring portion 20.
  • the end portions of these commutator elements as projecting beyond the end of the cast body 28, as shown in broken lines in Fig. 6, may be bent to form electrical connector hooks 36, if desired, the mutual distance between these hooks being increased by way of cutting a broadened notch between them; it will be understood, however, that a desired distance between these hooks may be provided initially in a simple manner by the working on the strip member 2, viz. by a stamping out of simple notches in the edge portion as shown to the left in Figs. 1 and 2.
  • the said front end By the penetration of the shearing front edge 14 of the tool into the profile portion 6 the said front end will be able, due to its inclination, to cut into the profile portion, and for this reason the plough shear 12 should be mounted on a heavily dimensioned and accurately guided tool carrier 10 (Fig. 2).
  • the said diving effect may be reduced by subjecting the material to two or more successive operations, whereby the ploughing cuttings are effected with increasing depth and/or width.
  • the length profile of the anchoring portions 20 may in a simple manner be varied by a corresponding variation of the cross profile of the portion 6 at the strip member 2, e.g. for the provision of local breaks of the anchoring portions for an improved axial holding thereof in the cast body 28, just as also the cross section profile of the anchoring portions 20 may be varied widely all according to the profile of the ploughing tool or tools.
  • the ploughed up ribs 18 may be further ploughed up, viz. by a subsequent treatment with a ploughing tool as cutting into the sides of the ribs spaced from the bottom surface between the anchoring portions 20.
  • Fig. 7 a profiled material strip 2 rolled up into a cylinder 40, which is placed between opposed tools 42 and 44, each of these tools comprising a circular row of ploughing tools 10, 12, 14 projecting from rear carrier members 46.
  • these carrier members are connected with means for urging them towards each other, whereby all the ploughing tools 10, 12, 14 are forced into the internally raised portion 6 of the cylinder 40 to effect the said ploughing action thereon.
  • the ploughing tools 10, 12 of the opposed tool units 42, 44 are circumferentially staggered so as to each fit into the space between two opposed tools 10, 12 whereby all the relevant anchoring elements 20 are producible by one operation of the two multiple tools 42 and 44. Due to the equal number of separate tools 10, 12 on these multiple tools the cylindrical member 40 will be influenced by generally equal and oppositely directed sticking forces, whereby the cylindrical member 40 need not be separately supported in the direction of the movements of the multiple tools 42 and 44.
  • the anchor elements 20 may be shaped with any of a wide variety of possible shapes, one example being shown in Fig. 8, either by one step operation of correspondingly shaped tools or by successive operation of different tools.
  • the shape and the size of the anchor elements may be selected according to the requirements and circumstances, e.g. the type of material used (copper, aluminium or other).
  • the cylindrical member as provided with the anchor elements may be connected with the insulating commutator body 28 (Fig. 5) either by direct casting out thereof or by insertion into a precast body 28.
  • the cylindrical member 40 (Fig. 7) may be a roled up strip member 2 or an entirely closed ring member produced in any suitable manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Claims (8)

1. Verfahren zur Herstellung von Kommutatoren der Art, bestehend aus einer Reihe voneinander getrennter Kommutatorelemente mit einer freiliegenden Kommutatorseite und einer gegenüberliegenden Seite, die mit integral hinterschnittenen vorspringenden Teilen versehen ist, die ineinem eingegossenen Kommutatorkörper (28) gesicherte Verankerungselemente (20) bilden, wobei die Reihe von Kommutatorelementen aus einem länglichen einstückigen Materialglied her- . gestellt wird, das zur Bildung der genannten Verankerungselemente (20) einseitig bearbeitet und anschliessend, wenn dieses Materialglied mit dem genannten eingegossenen Kommutatorkörper verbunden oder dieser Körper in das Materialglied eingegossen worden ist, durch Quereinschnitte (34) zwischen den die aufeinanderfolgenden Verankerungselemente tragenden Teilen des Materialgliedes in die genannte Reihe getrennter Kommutatorelemente aufgeteilt wird, dadurch gekennzeichnet, dass die Verankerungselemente (20) durch ein quer gerichtetes Aufreissen der betreffenden Seite des länglichen einstükkigen Materialgliedes (2, 40) mittels hinterschneidender pflugähnlicher Werkzeuge (12) hergestellt werden, welche Werkzeuge das Oberflächenmaterial des Materialgliedes im allgemeinen nach aussen und nach oben längs der gegenüberliegenden Seiten der pflugähnlichen Werkzeuge (12) örtlich verschieben, wobei das so verschobene Material eine schräg aufwärts verlaufende hinterschnittene Rippe (18) bildet, die so angeordnet ist, dass sie zusammen mit einer entsprechenden gegenüberliegenden, schräg verlaufenden, benachbarten Rippe (18) das Verankerungselement (20) eines anschliessend durch die genannten Quereinschnitte geformten Kommutatorelements bildet.
2. Verfahren nach Anspruch 1, bei dem das quer gerichtete Aufreissen längs mit den Achsen der genannten aufeinanderfolgenden Quereinschnitte (34) zusammenfallender Achsen erfolgt, wobei jedes Kommutatorelement mit einer im wesentlichen V-förmigen Verankerungsrippe (20) versehen wird, die durch Rippenteile (18) aus jeweiligen benachbarten Aufreissbereichen gebildet werden.
3. Verfahren nach Anspruch 1, bei dem das Materialglied (2, 40) mit einem oder mehreren von den Seiten des Materialgliedes Abstand haltenden erhabenen Teilen (6) profiliert wird, wobei das Aufreissen im wesentlichen nur durch diesen oder diese erhabenen.Teil(e) erfolgt.
4. Verfahren nach Anspruch 1, bei dem das quer gerichtete Aufreissen hintereinander am länglichen Materialglied entlang erfolgt.
5. Verfahren nach Anspruch 1, bei dem das quer gerichtete Aufreissen durch zwei gegenüberliegende pflugähnliche Werkzeuge (42, 44) erfolgt, die von gegenüberliegenden Seiten des Materialgliedes in dieses hineingedrückt werden.
6. Verfahren nach Anspruch 1, bei dem das Aufreissen an einem Materialglied (40) erfolgt, das bereits als ein völlig oder annähernd ununterbrochenes zylindrisches Glied geformt ist.
7. Verfahren nach Ansprüchen 5 und 6, bei dem die Innenseite eines zylindrischen Materialgliedes (40) gleichzeitig von seinen beiden Seiten durch jeweilige gegenüberliegende, mehrfach arbeitende, pflugähnliche Werkzeuge (42, 44) dem ge- . nannten Aufreissvorgang unterzogen wird, welche Werkzeuge in Relativabständen über den Umfang des Zylinders so angeordnet sind, dass sie alle erforderlichen Verankerungselemente in einem Arbeitsgang herstellen.
8. Verfahren nach Anspruch 1, bei dem das Materialglied in jedem Aufreissbereich zwei oder mehreren aufeinanderfolgenden Aufreissvorgängen unterzogen wird.
EP83900915A 1982-03-12 1983-03-11 Herstellungsverfahren für kommutatoren Expired EP0102378B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83900915T ATE21192T1 (de) 1982-03-12 1983-03-11 Herstellungsverfahren fuer kommutatoren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK108882A DK158803B (da) 1982-03-12 1982-03-12 Fremgangsmaade ved tilvirkning af kommutatorer
DK1088/82 1982-03-12

Publications (2)

Publication Number Publication Date
EP0102378A1 EP0102378A1 (de) 1984-03-14
EP0102378B1 true EP0102378B1 (de) 1986-07-30

Family

ID=8100862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83900915A Expired EP0102378B1 (de) 1982-03-12 1983-03-11 Herstellungsverfahren für kommutatoren

Country Status (9)

Country Link
EP (1) EP0102378B1 (de)
JP (1) JPS59500393A (de)
DE (1) DE3364840D1 (de)
DK (1) DK158803B (de)
ES (1) ES8402984A1 (de)
IE (1) IE54519B1 (de)
IT (1) IT1160802B (de)
WO (1) WO1983003324A1 (de)
ZA (1) ZA831642B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104979735A (zh) * 2015-07-25 2015-10-14 薛宜 换向器铜片制作方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2221580B (en) * 1988-08-04 1992-09-23 Johnson Electric Ind Mfg A two part commutator assembly for an electric motor
JP5260867B2 (ja) * 2006-12-15 2013-08-14 株式会社ミツバ コンミテータ、コンミテータ製造用金型およびコンミテータの製造方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB677779A (en) * 1949-05-20 1952-08-20 Hoover Ltd Improvements relating to the manufacture of commutators for dynamo-electric machines
US3987539A (en) * 1974-01-31 1976-10-26 Consolidated Foods Corporation Method of making a molded commutator
US4216575A (en) * 1979-02-01 1980-08-12 Noranda Mines Limited Method of reforming the fins of a finned tube
GB2049496B (en) * 1979-05-18 1982-10-27 Franklin & Freeman London Ltd Manufacturing commutators for electric rotating machines
YU39889B (en) * 1981-09-29 1985-04-30 Kolektor Semi-manufactured commutator for commutaors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104979735A (zh) * 2015-07-25 2015-10-14 薛宜 换向器铜片制作方法

Also Published As

Publication number Publication date
ES520856A0 (es) 1984-03-16
EP0102378A1 (de) 1984-03-14
WO1983003324A1 (en) 1983-09-29
IT8320046A0 (it) 1983-03-11
IE830511L (en) 1983-09-12
DE3364840D1 (en) 1986-09-04
ZA831642B (en) 1983-11-30
DK108882A (da) 1983-09-13
ES8402984A1 (es) 1984-03-16
IE54519B1 (en) 1989-11-08
JPS59500393A (ja) 1984-03-08
IT1160802B (it) 1987-03-11
DK158803B (da) 1990-07-16

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