US3664012A - Method of making a commutator - Google Patents

Method of making a commutator Download PDF

Info

Publication number
US3664012A
US3664012A US50095A US3664012DA US3664012A US 3664012 A US3664012 A US 3664012A US 50095 A US50095 A US 50095A US 3664012D A US3664012D A US 3664012DA US 3664012 A US3664012 A US 3664012A
Authority
US
United States
Prior art keywords
blanks
blank
die
ram
copper
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 - Lifetime
Application number
US50095A
Other languages
English (en)
Inventor
Heinz Wilke
Claus Bertram
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3664012A publication Critical patent/US3664012A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49011—Commutator or slip ring assembly

Definitions

  • the lamellas are made of copper which material has long known to be excellently suited for the purpose.
  • the price of copper has steadily increased in recent years and to make the lamellas in their entirety from this material is no longer economically justifiable.
  • no acceptable alternative has become known.
  • one aspect of the invention resides in a method of making a commutator.
  • This method briefly stated, comprises the steps of making at least one blank of copper and at least one blank of another metal. These blanks are then jointly subjected to cold pressing in a manner requisite to effect their deformation to a lamella-ring configuration with simultaneous flowing of the copper to an outer annular zone, and of the other metal at least in part to an inner annular zone of the ring. At the same time, cold-welding or cold-fusing of the metals takes place at their interface. A hub of insulatingmaterial is then affixed to the ring.
  • FIG. 1 is an axial section showing two annular blanks for making a lamella ring according to the invention
  • FIG. 2 illustrates, partly in section, a pressing apparatus accommodating the blanks of FIG. 1 and operative for converting them to a novel lamella ring;
  • FIG. 3 is a view analogous to FIG. 2, but showing the apparatus and the blanks subsequent to conversion of the latter;
  • FIG. 4 is a section taken on line IVIV of FIG. 3;
  • FIG. 5 is a plan view, partly sectioned, of a commutator incorporating the lamella ring made according to FIGS. 1-4.
  • FIG. 1 illustrates two annular blanks 10 and 11 which are required for making the novel lamella ring.
  • Blank 10 is made from aluminum, blank 11 from copper, and both have identical inner and outer diameters and complementarily tapered conical endfaces 10a, 1 1a respectively.
  • a cold-press 12 is shown in FIG. 2 for converting the blanks 10 and 11 into a lamella ring. It has a two-section die 13 of which the lower section 13a has an opening 14 which is undercut at 14a to increase in diameter in downward direction. Upwardly, the opening 14 has a conically outwardly directed annular shoulder 14b and merges into a bore 15 which continues in the upper section 13b of the die 13.
  • stamp 16 is arranged above the die 13, mounted for movement downwardly toward and upwardly away from the die in known manner.
  • Stamp 16 has an extension 17 which is provided on its outer circumference with regularly distributed i.e. equi-angularly spaced grooves 18 which extend in axial direction of extension 17 and are of undercut dove-tailed cross-section.
  • the upper delimitation of extension 17 is provided by a shoulder 19, and attention is directed to the fact that the configuration of stamp 16 is such that the portion of stamp 16 which is located upwardly of shoulder 16 will fit into the bore 15 with slight clearance.
  • the blanks 10 and 11 are accommodated in the bore 15 with their endfaces 10a and 11a in abutment, such that their contact face 20 conically tapers in radially inward direction, seen in direction of pressure exerted by the stamp 16.
  • This direction is illustrated by the arrow, and it will be appreciated that as the stamp 16 moves downwardly in this direction, the extension 17 will pass through the aligned openings of the blanks l0, 11 until its leading end enters the opening 14 in the die 13.
  • the shoulder 19 abuts the upwardly directed endface of the blank 10
  • continued movement of the stamp 16 in direction of the arrow causes the material of blanks 10 and 11 to become plastic and to flow through the narrow annular gap 21 which is defined between the extension 17 and the opening 14, as shown in FIG. 3.
  • the material of the blanks is so deformed that the copper of blank 11 flows to the outer annular zones, and the aluminum of blank 10 flows to the inner annular zone of the tubular lamella ring 22 which takes shape below the annular gap 21.
  • FIG. 4 shows clearly that as the aluminum of blank 10 flows through the annular gap 21, the dove-tail sectioned grooves 18 in extension 17 are reproduced in form of complementary axial ribs 23 at the inner periphery of lamella ring 22.
  • FIG. 2 shows the apparatus ready for operation
  • FIG. 3 shows it at the end of its working stroke.
  • the stamp 16 has entered into bore l5'of die 13 to such an extend that the material of blank 11 has passed entirely through gap 21; the material of blank 10 has only passed partly through the gap 21 and enough of it remains to form above the gap 21 a rein 24 which is subsequently converted into the contacts of the lamellas.
  • the copper of blank 11 has travelled to the outer annular zone of ring 22, located below the rein 24 and which will during subsequent further processing form the contact face 28 where the commutator lamellas are engaged by the (non-illustrated) carbon brushes.
  • the fused interface a of the two materials (of blanks 10 and 11) extends conically from the outside to the inside in direction of stamp pressure and over the length of the lamella surface 25.
  • FIG. 5 shows how the lamella ring 22 produced in accordance with FIGS. 1-4 is further processed for conversion to a commutator.
  • the ring 22 is first provided with a hub 27 of insulating material, which can be done in known manner in a press die. Hub 27 has a center aperture 28 so that it can be mounted on a motor shaft. Thereupon the lamella ring 22 with its rein 24 is incised as by sawing axially to form individual commutator lamellas 29 having contacts 30, with each lamella 29 being anchored in the material of hub 27 via one of the undercut ribs 23. Finally, the contacts are provided with cuts or incisions 31 for the winding leads.
  • the finished commutator is shown in FIG. 5, as already pointed out. It is identified with reference numeral 26 and provided with lamellas 29 the outer layers of which in the region of the contact face are of copper while the inner zones in the region of the anchoring or securing ribs 23 and in the region of the contacts are of aluminum.
  • the interface between the two metals is identified as 20a and this is where the metals are intimately connected by cold-welding or coldfusing.
  • This interface 200 extends over the length of the lamella contact face 25, beginning behind the contacts 30 and continuing conically from the outer edge toward the inner edge of the lamella ring, terminating at the inner end of the respective lamella.
  • both of said blanks being annular; and wherein the step of subjecting said blanks to cold-pressing comprises confining said blanks in a die, and inserting a cooperating stamp into said die to define therewith a narrow annular gap through which the material of said blanks is at least partly, forcibly extruded with concomitant strong stretching and cold-welding of the copper and other metal at their interface.
  • said blanks each having a conical endface; and wherein said endfaces abut when said blanks are in said die prior to insertion of said stamp.
  • said blanks having respective complementary endfaces each of which diverges conically in radially outward direction; and comprising the step of inserting said blanks into said die with said endfaces in mutual abutment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
US50095A 1969-07-05 1970-06-26 Method of making a commutator Expired - Lifetime US3664012A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1934213A DE1934213C3 (de) 1969-07-05 1969-07-05 Verfahren zur Herstellung eines Kommutators

Publications (1)

Publication Number Publication Date
US3664012A true US3664012A (en) 1972-05-23

Family

ID=5739006

Family Applications (1)

Application Number Title Priority Date Filing Date
US50095A Expired - Lifetime US3664012A (en) 1969-07-05 1970-06-26 Method of making a commutator

Country Status (5)

Country Link
US (1) US3664012A (fr)
JP (1) JPS50486B1 (fr)
DE (1) DE1934213C3 (fr)
FR (1) FR2052882A5 (fr)
GB (1) GB1308555A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786559A (en) * 1972-05-22 1974-01-22 Hewlett Packard Co Cold diffusion welds in a microcircuit package assembly
US3857163A (en) * 1971-12-14 1974-12-31 Alcan Res & Dev Forming pressure-welded joints
US3949466A (en) * 1974-05-28 1976-04-13 Arthur D. Little Inc. Process for forming an aluminum electrical conducting wire junction end piece
US3970113A (en) * 1973-05-30 1976-07-20 Motorwagenfabrik Berna Ag Bimetal multiple cylinder for extruders in plastics processing machinery
US4002284A (en) * 1971-06-29 1977-01-11 Metall-Werk Merkur Gmbh Method of making a cold welded connection
US4183558A (en) * 1977-10-12 1980-01-15 B.V.Koninklijke Maatschappij "De Schelde" Method for welding by pressure one or more pipes to a plate in one process
US4367838A (en) * 1979-09-20 1983-01-11 Kawasaki Jukogyo Kabushiki Kaisha Method of producing clad steel articles
US4611391A (en) * 1982-11-19 1986-09-16 Robert Bosch Gmbh Commutator ring manufacturing method and apparatus
US4667394A (en) * 1982-11-19 1987-05-26 Robert Bosch Gmbh Method of making a commutator ring having segments
US4756465A (en) * 1985-04-15 1988-07-12 Latviisky Gosudarstvenny Institut Method of cold welding
WO1988006356A1 (fr) * 1987-02-12 1988-08-25 Mitsubishi Denki Kabushiki Kaisha Moteur a courant continu et procede de fabrication
FR2742008A1 (fr) * 1995-12-05 1997-06-06 Rockwell Lvs Procede de fabrication d'un collecteur de machine tournante et collecteur fabrique selon ce procede
US20100003867A1 (en) * 2008-07-03 2010-01-07 Draexlmaier GmbH Connector for use with light-weight metal conductors
CN105024503A (zh) * 2014-04-21 2015-11-04 江苏龙城精锻有限公司 混合励磁发电机用爪极热锻冷挤制造工艺

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5231874U (fr) * 1975-08-29 1977-03-05
JPS5231875U (fr) * 1975-08-29 1977-03-05
JPS5231873U (fr) * 1975-08-29 1977-03-05
DE3201027C2 (de) * 1982-01-15 1986-11-27 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zum Herstellen eines Kommutatorringes
DE102013207884A1 (de) * 2013-04-30 2014-10-30 Robert Bosch Gmbh Verfahren zur Herstellung eines Kollektors für eine Kommutierungseinrichtung
DE102013207887A1 (de) * 2013-04-30 2014-10-30 Robert Bosch Gmbh Verfahren zur Herstellung eines Kollektors für eine Kommutierungseinrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953698A (en) * 1958-05-31 1960-09-20 Fiat Spa Commutator for dynamo-electric machines and method of manufacturing
US2963774A (en) * 1956-09-17 1960-12-13 Dayton Prec Mfg Company Manufacture of commutators having molded cores
US3005920A (en) * 1959-01-19 1961-10-24 Fiat Spa Commutator for dynamo electric machines and manufacturing method
US3177562A (en) * 1960-01-16 1965-04-13 Kautt & Bux Kg Method of producing commutators
US3407491A (en) * 1965-10-23 1968-10-29 Gen Motors Corp Molded commutator
US3478421A (en) * 1966-07-20 1969-11-18 Lucas Industries Ltd Method of manufacturing commutators
US3482307A (en) * 1966-03-30 1969-12-09 Nippon Denso Co Method for producing commutators for miniature electric machines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963774A (en) * 1956-09-17 1960-12-13 Dayton Prec Mfg Company Manufacture of commutators having molded cores
US2953698A (en) * 1958-05-31 1960-09-20 Fiat Spa Commutator for dynamo-electric machines and method of manufacturing
US3005920A (en) * 1959-01-19 1961-10-24 Fiat Spa Commutator for dynamo electric machines and manufacturing method
US3177562A (en) * 1960-01-16 1965-04-13 Kautt & Bux Kg Method of producing commutators
US3407491A (en) * 1965-10-23 1968-10-29 Gen Motors Corp Molded commutator
US3482307A (en) * 1966-03-30 1969-12-09 Nippon Denso Co Method for producing commutators for miniature electric machines
US3478421A (en) * 1966-07-20 1969-11-18 Lucas Industries Ltd Method of manufacturing commutators

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002284A (en) * 1971-06-29 1977-01-11 Metall-Werk Merkur Gmbh Method of making a cold welded connection
US3857163A (en) * 1971-12-14 1974-12-31 Alcan Res & Dev Forming pressure-welded joints
US3786559A (en) * 1972-05-22 1974-01-22 Hewlett Packard Co Cold diffusion welds in a microcircuit package assembly
US3970113A (en) * 1973-05-30 1976-07-20 Motorwagenfabrik Berna Ag Bimetal multiple cylinder for extruders in plastics processing machinery
US3949466A (en) * 1974-05-28 1976-04-13 Arthur D. Little Inc. Process for forming an aluminum electrical conducting wire junction end piece
US4183558A (en) * 1977-10-12 1980-01-15 B.V.Koninklijke Maatschappij "De Schelde" Method for welding by pressure one or more pipes to a plate in one process
US4367838A (en) * 1979-09-20 1983-01-11 Kawasaki Jukogyo Kabushiki Kaisha Method of producing clad steel articles
US4667394A (en) * 1982-11-19 1987-05-26 Robert Bosch Gmbh Method of making a commutator ring having segments
US4611391A (en) * 1982-11-19 1986-09-16 Robert Bosch Gmbh Commutator ring manufacturing method and apparatus
US4756465A (en) * 1985-04-15 1988-07-12 Latviisky Gosudarstvenny Institut Method of cold welding
WO1988006356A1 (fr) * 1987-02-12 1988-08-25 Mitsubishi Denki Kabushiki Kaisha Moteur a courant continu et procede de fabrication
US4933587A (en) * 1987-02-12 1990-06-12 Mitsubishi Denki Kabushiki Kaisha DC motor having improved contact between commutator and armature
FR2742008A1 (fr) * 1995-12-05 1997-06-06 Rockwell Lvs Procede de fabrication d'un collecteur de machine tournante et collecteur fabrique selon ce procede
US20100003867A1 (en) * 2008-07-03 2010-01-07 Draexlmaier GmbH Connector for use with light-weight metal conductors
US7828610B2 (en) * 2008-07-03 2010-11-09 Lisa Draexlmaier Gmbh Connector for use with light-weight metal conductors
CN105024503A (zh) * 2014-04-21 2015-11-04 江苏龙城精锻有限公司 混合励磁发电机用爪极热锻冷挤制造工艺
CN105024503B (zh) * 2014-04-21 2017-06-23 江苏龙城精锻有限公司 混合励磁发电机用爪极热锻冷挤制造工艺

Also Published As

Publication number Publication date
DE1934213B2 (de) 1979-10-25
JPS50486B1 (fr) 1975-01-09
FR2052882A5 (fr) 1971-04-09
DE1934213A1 (de) 1971-01-14
GB1308555A (en) 1973-02-21
DE1934213C3 (de) 1980-07-10

Similar Documents

Publication Publication Date Title
US3664012A (en) Method of making a commutator
US2623974A (en) Process for extruding flanges around holes in metal sheets and welding nuts thereto
GB1458525A (en) Method of manufacturing stator assemblies for dynamo electric machines
US3140414A (en) Commutators
US3608350A (en) Apparatus and method for producing blanks for commutators for miniature electric devices
US3958326A (en) Method of manufacturing commutator
US1898696A (en) Method of manufacturing commutator segments
JPS5934058B2 (ja) 放射状に形成された部材が軸方向に折曲されているポ−ルピ−スの製造方法
US2674784A (en) Commutator
US2688793A (en) Method of making commutators
US3407491A (en) Molded commutator
US3925881A (en) Method of making a face commutator
US980420A (en) Bimetallic rivet.
US2038419A (en) Blank and method for making commutators
US4621514A (en) Method of making an intermediate stage, intermediate blank for a dynamo electric machine commutator ring, and apparatus to carry out the method
KR850000540B1 (ko) 정류자편과 아마튜어 코일의 접속방법
US2864157A (en) Method of making commutators
US3251120A (en) Method of making a commutator
US2693025A (en) Method of making commutators
US2454829A (en) Electrical connector
US2990489A (en) Commutators for electric machines
US3717928A (en) Method of manufacturing commutators for small-size electric machines
US1622179A (en) Method of making clamping rings for commutators
US1233764A (en) Manufacture of commutators.
US3530500A (en) Contact forming between end portions of the armature winding and the commutator of a dynamoelectric machine