EP0524393B1 - Méthode de fabrication d'un collecteur et appareil pour exécuter la méthode - Google Patents

Méthode de fabrication d'un collecteur et appareil pour exécuter la méthode

Info

Publication number
EP0524393B1
EP0524393B1 EP92108343A EP92108343A EP0524393B1 EP 0524393 B1 EP0524393 B1 EP 0524393B1 EP 92108343 A EP92108343 A EP 92108343A EP 92108343 A EP92108343 A EP 92108343A EP 0524393 B1 EP0524393 B1 EP 0524393B1
Authority
EP
European Patent Office
Prior art keywords
segment
fact
segments
accordance
section
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
EP92108343A
Other languages
German (de)
English (en)
Other versions
EP0524393A3 (en
EP0524393A2 (fr
Inventor
Joze Dipl.-Ing. Org Potocnik
Ivan Cerin
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.)
Kolektor doo
Original Assignee
Kolektor doo
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 Kolektor doo filed Critical Kolektor doo
Publication of EP0524393A2 publication Critical patent/EP0524393A2/fr
Publication of EP0524393A3 publication Critical patent/EP0524393A3/de
Application granted granted Critical
Publication of EP0524393B1 publication Critical patent/EP0524393B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention relates to a method for producing a commutator, which has the features of the preamble of claim 1, and an apparatus for performing such a method.
  • the invention has for its object to provide a method for producing commutators, which enables less expensive production and can achieve a higher dynamic and thermal stress resistance of the commutators. This object is achieved by a method having the features of claim 1.
  • connection element cannot be provided with axial webs to form anchoring members, as in the known extrusion process, but rather segments with grooves can also be used to hold reinforcing rings.
  • connection elements on the segments there is the possibility of reinforcing them with prestressed rings and thereby achieving a substantial increase in the dynamic and thermal resistance of such commutators.
  • the method according to the invention is also very advantageous in that the tool required for material displacement does not need to have thin-walled parts which are subject to severe wear.
  • each segment can be provided with at least one radially projecting rib or the like extending in the longitudinal direction of the segment on its back surface before the material displacement.
  • This rib By receiving this rib in a corresponding guide groove of the tool, the segment is prevented from moving transversely to its longitudinal extent, that is to say in the circumferential direction of the commutator.
  • the height and width of these ribs can be relatively small. It is of secondary importance which profile your ribs have. Because of its simplicity, for example, a profile that points away from the back surface in the form of a wedge is very advantageous. It is also advantageous to form the rib or ribs onto the back surface of the segment only in a central zone thereof. The tool used for this purpose can then slide on the two side zones of the back surface located next to the rib.
  • Securing the segments against movement transversely to their longitudinal direction during material displacement can be considerably improved in that the new back surface resulting from the material displacement is provided with at least one radially projecting rib or the like extending in the longitudinal direction of the segment, which expediently like the rib or Ribs of the original back surface is formed.
  • This rib can engage in a corresponding guide of the tool, whereby the newly formed rib is lengthened to the extent that the originally existing rib is shortened.
  • these ribs serve for the axial alignment and mutual spacing of the segments during the later radial expansion of the segment ring by means of a device, not shown, and when pressing the same with a press material in a corresponding, grooved press ring.
  • At least one rib, groove or the like extending in the radial direction is also formed on the front side facing the one end of the segment and / or on the front side facing the other end of the segment.
  • a rib gives the material used to form the connection element a certain radial guidance and at the same time serves for the radial alignment of the segments in the subsequent work steps.
  • the segments can be cut to length from a profile bar before the connection element is formed on. This way of producing the segments is particularly inexpensive.
  • the connecting element can also be integrally formed in the manner according to the invention on a segment which has been produced in a different way.
  • the effort for punching out a groove at each end of the segment is very low.
  • these grooves each form an annular groove in the two end faces of the segment ring, which can each receive a reinforcement ring.
  • the segments of the commutator are joined together to form a cylindrical segment ring before the connecting elements of all segments are subsequently molded on simultaneously.
  • the invention is also based on the object of providing a device with which the connection elements can be molded onto all segments of a commutator at the same time. This object is achieved by a device having the features of claim 11.
  • a commutator for a starter motor that is to say a motor for starting an internal combustion engine of a motor vehicle
  • pieces of the same length are separated from a profile bar, not shown, which consists of a copper alloy customary for the segments of commutators.
  • the length of these pieces is equal to the desired length of the segments 1 for the commutator designated as a whole by 2.
  • the cross-sectional profile of the segments 1 is shown in FIG. 3.
  • the angle which the two side surfaces enclose depends on the number of segments 1 which the commutator 2 has.
  • each segment 1 is provided at both ends with a groove 4 which is open towards the end of the segment.
  • the foot section of segment 1 is somewhat shorter than the back section. The thickness of the segments 1 measured in the circumferential direction of the commutator 2 can be reduced in the area of the middle section provided with the grooves 4 and the foot section. At the transition There is then a step from the two side surfaces of the back section to the middle section.
  • the height of the segments 1 measured in the radial direction of the commutator 2 and in particular the corresponding height of the back section is chosen to be greater than this height of the segments 1 during manufacture Commutator.
  • segment ring 6 The number of segments 1 required for the commutator 2 is combined to form a segment ring 6, in which the segments 1 abut one another without a gap.
  • This segment ring 6 is then inserted into a first section 7 of a hollow cylindrical punch, the inside diameter of which is equal to the outside diameter of the segment ring 6 defined by the back surface of the segments 1.
  • rib 3 there is a guide groove extending in the axial direction and corresponding in cross-sectional shape to the rib 3 in the inner lateral surface of the first section 7 of the stamp. The axial alignment of the segments 1 is therefore ensured.
  • the one end face of a likewise hollow cylindrical, second section 8 coaxially adjoins the one end face of the first section 7 of the stamp.
  • the connection of the two sections 7 and 8 is not shown, since it can be chosen arbitrarily.
  • the second section 8 is provided on the side adjoining the first section 7 with an annular groove 9 open towards the first section 7 and radially inward, the width of which is measured in the axial direction of the stamp and is equal to that in FIG axial direction of the commutator 2
  • Measured width of the rod-shaped connecting element 10 to be molded onto each segment 1 is selected, which is used to connect the segment 1 to the conductors of the rotor winding to which the commutator 2 is assigned.
  • the depth of the annular groove 9 measured in the radial direction is selected to be somewhat greater than the height of the connecting element 10 to be molded in the radial direction.
  • the radius of the inner lateral surface of the second section 8 of the stamp is chosen so much smaller than the radius of the inner lateral surface of the first section 7 that the amount of material displaced is the same the amount of material required for the formation of the connecting element 10.
  • the inner lateral surface of the second section 8 is also provided with guide grooves which are continuous in the axial direction, each of which is aligned with the center of the back surface of one of the segments 1.
  • these guide grooves have the same cross-sectional profile as those of the first section 7.
  • a different cross-sectional profile could also be chosen because the rib of the newly formed back surface engaging in this guide groove is only formed when the material is displaced.
  • the punch consisting of sections 7 and 8 is assigned a cylindrical mandrel 11 which has an end section 11 ', the outer diameter of which is equal to the inner diameter of the segment ring 6 and the axial length of which is approximately is chosen equal to the axial length of the segment ring 6.
  • the end face of the mandrel 11, from which the end portion 11 'protrudes, forms, as shown in FIGS. 8 and 9, a step whose height is equal to the step that the segments 1 have at the transition from their foot portion to the back portion. This ensures that both the back section and the foot section of the segments 1 rest against the end face of the mandrel 11.
  • the end face of the mandrel 11 is provided with a groove 11 Nut aligned with the grooves 4 of the segments 1, into which an auxiliary ring 12 engages, as in the grooves 4.
  • This auxiliary ring 12 ensures the cohesion of the segment ring 6. Therefore, the segment ring 6 can first be placed on the end section 11 'of the mandrel 11 before it is inserted into the first section 7 of the stamp.
  • the stamp and the mandrel 11 are moved rapidly with respect to one another in the sense of an introduction of the segment ring 6 into the second section 8 of the stamp.
  • material is displaced from the back of all segments 1 in the axial direction into the annular groove 9 of the stamp, in which the rod-shaped connecting element 10 which projects radially from segment 1 is formed.
  • Each segment 1 is given a new back surface 13 with a new rib 14 projecting radially from the back surface 13.
  • the rib 14, which is formed by the associated guide groove of the second section 8 and therefore engages in it, ensures that each segment 1 also maintains its axial alignment in the second section 8 of the stamp.
  • At least one of the two flanks of the annular groove 9, which are formed by the mutually facing end faces of the first section 7 and the second section 8, have at least one radially extending guide rib and / or guide groove for each segment 1, through which the formation of the connecting element 10 serving, entering the annular groove 9 receives a radial guide.
  • the formation of the connecting elements 10 is complete when the segment ring 6 has been pressed into the part of the section 8 which has the smaller inside diameter compared to the first section 7, except for the end section carrying the connecting elements 10.
  • the segment ring 6 is now removed from the stamp.
  • the shape and size of the integrally formed connecting elements 10 show FIGS. 5 and 6, which show the segment ring 6 after removal from the stamp in a front view or a segment 1 in a side view. Then the segment ring 6 is also removed from the mandrel 11.
  • connection elements 10 can be adapted to the requirements within wide limits.
  • the segment ring 6 is subsequently widened uniformly.
  • an insulating, bush-shaped hub 15 is inserted into the expanded segment ring 6. Prestressed reinforcement rings 16 are then introduced into the two end ring grooves formed by the groove 4 of the segments 1. The entire clamping force of the reinforcement rings 16 is therefore converted into a radially inward force, with which the segments 1 are pressed against the hub 15, which is thereby in the radial direction is biased.
  • the hub 15 can of course consist of metal and be insulated from the segments 1 by a thin insulating layer.
  • a steel hub is highly dimensionally stable, which, together with the radial preload, leads to a high dynamic and thermal load capacity of the commutator 2.
  • press material as is usually used for press commutators, is pressed into the segment ring 6.
  • the molding material fills all cavities. It also penetrates between the segments 1 and, as shown in FIG. 1, covers the two end faces of the segment ring 6 and the hub 15.
  • connection elements 10 can also be finished in a different way after the connection elements 10 have been molded on.
  • 1 insulation lamella can be inserted between these segments.
  • connection elements 10 are each provided with a slot 17 for inserting the conductors of the rotor winding and, like the new back surfaces 13, turned over.

Landscapes

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

Claims (16)

  1. Procédé de fabrication d'un collecteur dont les segments formant la surface de portée des balais, présentent à l'une de leurs extrémités, chacun, un élément de connexion formé d'un seul tenant avec le segment en en faisant saillie radialement, et destiné à la connexion des conducteurs d'un enroulement de rotor, caractérisé en ce qu'en formant une nouvelle surface de tête (13) du segment (1), décalée en direction du pied de segment, le matériau existant entre la surface de tête initiale et la nouvelle surface de tête (13), est refoulé, dans la direction longitudinale du segment, vers la zone dans laquelle doit être formé l'élément de connexion (10), et y est accumulé en formant l'élément de connexion (10).
  2. Procédé selon la revendication 1, caractérisé en ce que le refoulement de matériau s'effectue par un formage à froid.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la totalité du matériau nécessaire à la formation de l'élément de connexion (10), est refoulé en une seule opération de travail.
  4. Procédé selon les revendications 1 à 3, caractérisé en ce qu'avant le refoulement de matériau, chaque segment (1) est pourvu sur sa surface de tête (1′), d'une nervure (3) en faisant saillie radialement et s'étendant dans la direction longitudinale du segment.
  5. Procédé selon la revendication 4, caractérisé en ce que la nervure (3) est formée dans une zone centrale située entre chacune de deux zones latérales de la surface de tête (1′).
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que lors du refoulement du matériau, la nouvelle surface de tête (13) est pourvue d'une nervure (14) en faisant saillie radialement et s'étendant dans la direction longitudinale du segment.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que sur le côté frontal dirigé vers l'une des extrémités du segment (1) et/ou sur le côté frontal dirigé vers l'autre extrémité du segment (1), de l'élément de connexion (10), est formée au moins une nervure et/ou une rainure s'étendant dans la direction radiale.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que les segments (1) sont débités à partir d'une barre de profilé.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce qu'avant le refoulement de matériau, chaque segment (1) est pourvu d'au moins une rainure (4).
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que les segments (1) du collecteur (2) sont réunis en un anneau de segments (6) cylindrique, et en ce que les élémenst de connexion (10) de tous les segments (1) sont formés simultanément.
  11. Dispositif pour la mise en oeuvre du procédé selon la revendication 10, caractérisé par
    - un mandrin (11, 11′) destiné à soutenir l'un des côtés frontaux de l'anneau de segments (6) cylindrique constitué par l'assemblage des segments (1), dont le diamètre est adapté à celui du cylindre défini par les surfaces de tête (1′) initiales des segments (1),
    - une matrice cylindrique creuse (7, 8), qui peut coulisser dans la direction axiale, par rapport au mandrin (11, 11′), et qui présente, entre un premier tronçon (7) dont le diamètre intérieur est adapté au diamètre du mandrin (11), et un second tronçon (8) dont le diamètre intérieur est adapté à celui du cylindre défini par la nouvelle surface de tête (13), une rainure annulaire (9) ouverte vers l'intérieur, dont la largeur mesurée dans la direction axiale est choisie égale à la dimension mesurée dans cette direction, des éléments de connexion (10) à former, et dont la profondeur mesurée dans la direction radiale, est choisie au moins égale à la hauteur des éléments de connexion (10) à former.
  12. Dispositif selon la revendication 11, caractérisé en ce que la surface périphérique intérieure, aussi bien du premier tronçon (7), que du second tronçon (8) de la matrice, est munie de rainuras de guidage s'étendant dans la direction longitudinale et destinée aux nervures (3, 14) des segments (1).
  13. Dispositif selon la revendication 11 ou 12, caractérisé en ce que les flancs de la rainure annulaire (9) sont pourvus, pour chaque segment (1), d'au moins une nervure de guidage et/ou rainure de guidage s'étendant dans la direction radiale, et destinée au matériau formant l'élément de connexion (10).
  14. Dispositif selon l'une des revendications 11 à 13, caractérisé en ce que le second tronçon (8) de la matrice, est formé par un corps séparé s'appuyant sur le premier tronçon (7), et renferme la rainure annulaire (9), dans sa surface frontale dirigée vers le premier tronçon (7).
  15. Dispositif selon l'une des revendications 11 à 14, caractérisé en ce que le mandrin (11) comporte un prolongement (11′) sous la forme d'un tenon dont le diamètre extérieur est adapté au diamètre intérieur de l'anneau de segments (6) formé des segments (1), et qui traverse celui-ci dans la direction axiale.
  16. Dispositif selon l'une des revendications 11 à 15, caractérisé en ce que pour des segments (1) comportant une rainure (4) dans l'un au moins des deux côtés frontaux, est prévu un anneau auxiliaire (12), qui s'engage dans la rainure annulaire formée par cette rainure (4), et s'engage également dans une rainure annulaire du mandrin (11).
EP92108343A 1991-07-23 1992-05-18 Méthode de fabrication d'un collecteur et appareil pour exécuter la méthode Expired - Lifetime EP0524393B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4124386A DE4124386C1 (fr) 1991-07-23 1991-07-23
DE4124386 1991-07-23

Publications (3)

Publication Number Publication Date
EP0524393A2 EP0524393A2 (fr) 1993-01-27
EP0524393A3 EP0524393A3 (en) 1993-07-07
EP0524393B1 true EP0524393B1 (fr) 1995-11-15

Family

ID=6436825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92108343A Expired - Lifetime EP0524393B1 (fr) 1991-07-23 1992-05-18 Méthode de fabrication d'un collecteur et appareil pour exécuter la méthode

Country Status (2)

Country Link
EP (1) EP0524393B1 (fr)
DE (2) DE4124386C1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB772460A (en) * 1954-08-20 1957-04-10 Hoover Ltd Improvements relating to commutators
FR2020461A5 (en) * 1969-01-27 1970-07-10 Dahl Paul Ste Cale Fabri Mfe of collector casings for electric motors
DE2028857C3 (fr) * 1969-06-13 1975-05-28 Hitachi Ltd., Tokio
DE3243191A1 (de) * 1982-11-23 1984-05-24 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zum herstellen eines kommutatorringes fuer einen kommutator
DE3530096A1 (de) * 1985-08-23 1987-02-26 Bosch Gmbh Robert Verfahren und vorrichtung zum herstellen von fahnenteilnuten eines kommutatorsegmentringes

Also Published As

Publication number Publication date
DE4124386C1 (fr) 1992-10-22
DE59204318D1 (de) 1995-12-21
EP0524393A3 (en) 1993-07-07
EP0524393A2 (fr) 1993-01-27

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