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WO2005092600A1 - Piece composite metal-matiere plastique a compensation a contraction compensee - Google Patents

Piece composite metal-matiere plastique a compensation a contraction compensee Download PDF

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Publication number
WO2005092600A1
WO2005092600A1 PCT/EP2005/050443 EP2005050443W WO2005092600A1 WO 2005092600 A1 WO2005092600 A1 WO 2005092600A1 EP 2005050443 W EP2005050443 W EP 2005050443W WO 2005092600 A1 WO2005092600 A1 WO 2005092600A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic
composite part
plastic element
metal element
shrinkage
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.)
Ceased
Application number
PCT/EP2005/050443
Other languages
German (de)
English (en)
Inventor
Hans-Juergen Oberle
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
Publication of WO2005092600A1 publication Critical patent/WO2005092600A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/681—Component parts, details or accessories; Auxiliary operations
    • B29C70/682—Preformed parts characterised by their structure, e.g. form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/78—Moulding material on one side only of the preformed part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2015/00—Gear wheels or similar articles with grooves or projections, e.g. control knobs
    • B29L2015/003—Gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/04—Bearings

Definitions

  • the present invention relates to a metal-plastic composite part according to the preamble of claim 1.
  • Plastic element In particular, a gap can occur between the plastic element and the metal element after the plastic element has solidified. As a result, play can occur between the two elements of the composite part, which, for example when used as a toothed wheel, can lead to undesirable noise development. Furthermore, when the direction of rotation changes, an impact can occur between the metal and the plastic element. Another problem with the shrinkage of the Plastic element can occur if a tension is introduced into the plastic element due to the shrinkage. These tensions can lead to premature fatigue of the plastic element, so that such composite parts can only have a short service life.
  • a composite part according to the invention with the features of claim 1 has the advantage that it can provide a play-free and tension-free metal-plastic connection.
  • the influences of the shrinkage of the plastic part are used for this.
  • the metal element and the plastic element of the composite part each have a contact surface, the contact surfaces of the two elements lying opposite one another and forming a contact area between the metal element and the plastic element.
  • the contact surfaces of the metal element and the plastic element are arranged at an angle to at least one direction of shrinkage of the plastic element.
  • the shrinkage direction of the plastic element can be axial, radial or tangential or in the circumferential direction.
  • Elasticity of the plastic allows a small relative movement between the plastic element and the metal element due to the gaps, so that the plastic element comes into contact with the metal element somewhat delayed and thus damping the hard stop is feasible.
  • an improved noise behavior and, on the other hand, a better durability of the composite part is achieved.
  • the contact area between the metal and the plastic element is preferably formed by tapering areas on the two elements.
  • the metal element and the plastic material element each have at least one contact surface at an angle to the radial, axial and tangential direction of the composite part.
  • the angle between the contact surface of the metal element and a direction of shrinkage and the angle between the contact surface of the plastic element and the direction of shrinkage are preferably the same.
  • the contact area between the metal element and the plastic element can be formed not only as a line but as a surface.
  • the composite part is preferably a gearwheel, the plastic element being arranged inside the gearwheel and has a through opening for receiving a shaft or the like.
  • the through opening is designed, for example, as a square or an internal toothing is provided on the through opening and the shaft is designed in each case in accordance with the shape of the through opening.
  • a small amount of play must be provided between the two elements.
  • the through opening in the plastic element preferably has a region that tapers in the axial direction of the composite part.
  • the plastic element further preferably has a collar which has a larger diameter than an inner diameter of the metal element. Axial securing of the plastic element on the metal element can thereby be obtained.
  • the contact area between the metal element and the plastic element is preferably formed by two mutually opposite and converging areas.
  • the two regions converging towards one another particularly preferably have the same angle relative to a direction of shrinkage of the plastic element, only the signs of the angles being different.
  • the metal element of the composite part is particularly preferably produced by means of sintering and the plastic element is injection-molded onto the metal element.
  • a composite part according to the invention is preferably used as a gear in an electrical machine, in particular on the output.
  • a large variety of variants can be obtained by means of the composite part according to the invention, since only a different plastic element can be injection molded onto a predetermined standardized metal element, which can be designed in accordance with an output shaft. This can be achieved, for example, simply by changing inserts in the plastic injection mold using the same insert made of metal.
  • the electrical machine is particularly preferably an electric motor which is used in a vehicle.
  • electric motors of this type can be used in vehicles for adjusting seats and / or backrests and / or other devices in the interior of the vehicle, in which special requirements with regard to low noise of the electric motor are required.
  • FIG. 1 shows a schematic sectional view of a composite part designed as a gearwheel according to an exemplary embodiment of the present invention
  • FIG. 2 shows a detailed sectional view of the gearwheel shown in FIG. 1
  • Figure 3 is a side view of the composite part from the left in Figure 2 and
  • FIG. 4 shows a partial sectional view along the line C-C in FIG. 2.
  • a composite part 1 according to the invention comprises a metal element 2 and a plastic element 3.
  • the plastic element 3 is essentially tubular and is arranged in a through opening of the metal element 2.
  • a through opening 4 which in this exemplary embodiment has a
  • a toothing 5 is provided on an outer circumference of the metal element 2, so that the composite part 1 shown in the exemplary embodiment is a gearwheel for an electric motor.
  • a shaft 6 can be introduced (see FIG. 2), via which the power of the electric motor can be delivered.
  • a play-free connection is now formed between the metal element 2 and the plastic element 3, which can in particular compensate for any shrinkage of the plastic element after the injection molding onto the metal element 2.
  • the shrinkage is exaggerated to better illustrate the invention.
  • Figure 2 is a section along the line AA of Figure 3.
  • the shrinkage between the metal element 2 and the plastic element occurs in the radial direction R, in the axial direction A and in the tangential direction or Circumferential direction T on.
  • the shrinkage SA occurs both on the left and on the right side of the plastic element 3. Due to the radial shrinkage SR, there is an annular gap between the metal element 2 and the plastic element 3, due to which, in the prior art, noise can occur during operation. Furthermore, in the prior art, stresses in the plastic element can occur due to the axial shrinkage, since the plastic element contracts in the axial direction and thus a tension occurs between its axial stops.
  • the tangential shrinkage ST can be seen in FIGS. 3 and 4.
  • contact surfaces are therefore provided on the metal element 2 and on the plastic element 3, which are arranged at an angle to at least one direction of shrinkage R, A and T.
  • the left part of Figure 2 is the
  • a contact surface 8a is provided on the metal element 2, which is arranged at an angle ⁇ to the axial direction of shrinkage A.
  • a surface 3c is also arranged on the plastic element 3 at an axial end, which due to the shrinkage is arranged at a somewhat larger angle than the angle ⁇ to the axial shrinkage direction A (cf. FIG. 2).
  • the angle of the metal element and the angle of the plastic element are initially the same, since the plastic initially lies directly against the metal contour during spraying. The larger angle results from the shrinkage of the plastic element.
  • the areas 8a and 3c can also be conical areas, so that the contact area would be a circle. This measure can thus be used to prevent
  • Areas 3b serve as axial securing of the plastic element on the metal element.
  • the protruding regions 3b are arranged in recesses 7 formed in the metal element 2. In Figure 4, this axial securing is shown in detail on a protruding area 3b.
  • FIG. 4 shows a partial sectional view along the line C-C of FIG. 2. A total of four projecting regions 3b are provided, each of which is inserted into correspondingly formed recesses 7.
  • the recesses 7 have at their ends in the circumferential direction contact surfaces 7a and 7b which are arranged at an angle ⁇ to the radial direction of shrinkage R (cf. FIG. 4).
  • Contact areas 3f and 3g are also provided on the protruding areas 3b, which due to the shrinkage are at a somewhat larger angle than the angle ⁇ to the radial
  • Shrinkage direction R are arranged.
  • the surfaces 7a and 7b or 3f and 3g taper towards one another. If a shrinkage occurs in the radial direction R and / or in the tangential direction T after the hardening of the plastic, a contact area K between the surfaces 7a and 3g or 7b and 3f is placed further towards the center of the plastic element 3, so that there is no play between the two elements 2 and 3 is present. Therefore, the occurring at the plastic element 3 shrinkage has no effect on the connection between the metal member 2 and the plastic element 3.
  • the shrinkage in the tangential direction, in figure 4 b on the basis of the width M of the recess in the
  • the shrinkage SR is drawn in relation to the length X 3 of the contact surfaces 3f, 3g and 7a, 7b of the plastic or metal element.
  • the length X 3 must always be greater than the maximum shrinkage that occurs in order to ensure a contact area between the plastic element 3 and the metal element 2.
  • FIG. 3 shows a left side view of the composite part 1 from FIG. 2.
  • four projecting areas with contact surfaces 3 c are also provided in order to compensate for any shrinkage that may occur on the plastic element 3.
  • the protruding areas of the plastic element 3 are arranged in recesses 8 of the metal element 2. Here is between one
  • Radial direction R and the tapered areas 8b and 8c provided an angle ⁇ .
  • the shrinkage SR in the radial direction is again smaller than a length X 2 of the surfaces 8b and 8c in the radial direction.
  • the shrinkage ST in the tangential direction can be recognized on the basis of the maximum width b M of the metal part relative to the width b ⁇ of the hardened plastic element 3.
  • the four projections formed on the plastic element 3 can shrink in the radial direction R, axial direction A and tangential direction Compensate T, the three surfaces 8a, 8b, 8c and 3c, 3d, 3e are provided.
  • the composite part according to the invention can thus be used to achieve zero-backlash compensation between the metal and the plastic element.
  • the choice of the different angles of the contact surfaces of the metal element or of the plastic element relative to a direction of shrinkage thus results in linear contact areas K. This also enables the
  • the angle ⁇ which defines the inclination of the contact surface 8a relative to the axial direction of shrinkage A, can be determined as follows:
  • dl is the diameter of the plastic part before the shrinkage
  • dl ' is the diameter of the plastic part after the shrinkage
  • SA is the shrinkage of the plastic part in the axial direction.
  • the other angles ⁇ and ⁇ can also be determined in a corresponding manner.
  • the metal element 2 is preferably produced in the sintering process, it is advantageous in terms of production technology if the conical regions are only attached to one end of the composite part and to the other end of the in

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une pièce composite comprenant un élément en métal (2) et un élément en matière plastique (3). L'élément en métal (2) présente une surface de contact (8a, 8b, 8c) et l'élément en matière plastique (3) présente une surface de contact (3c, 3d, 3e). Les surfaces de contact de l'élément en métal et de l'élément en matière plastique sont opposées les unes aux autres et forment une surface de contact entre l'élément en métal et l'élément en matière plastique. Les surfaces de contact (8a, 8b, 8c) de l'élément en métal et les surfaces de contact (3c, 3d, 3e) de l'élément en matière plastique sont disposées en un angle ( alpha , beta , delta ) par rapport à au moins un sens de contraction (R, A, T).
PCT/EP2005/050443 2004-03-24 2005-02-02 Piece composite metal-matiere plastique a compensation a contraction compensee Ceased WO2005092600A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410014363 DE102004014363A1 (de) 2004-03-24 2004-03-24 Metall-Kunstoff-Verbundteil mit Schwundkompensation
DE102004014363.3 2004-03-24

Publications (1)

Publication Number Publication Date
WO2005092600A1 true WO2005092600A1 (fr) 2005-10-06

Family

ID=34960881

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/050443 Ceased WO2005092600A1 (fr) 2004-03-24 2005-02-02 Piece composite metal-matiere plastique a compensation a contraction compensee

Country Status (2)

Country Link
DE (1) DE102004014363A1 (fr)
WO (1) WO2005092600A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017104159B4 (de) 2017-02-28 2021-01-21 Bayerische Motoren Werke Aktiengesellschaft Zahnrad für eine Ausgleichswelle und eine Ausgleichswelle
DE202020106739U1 (de) 2020-11-24 2022-02-25 Irnich Informatik Gmbh Gussform zum Spritzgießen von Zahnrädern

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56146718A (en) * 1980-04-18 1981-11-14 Yamatake Honeywell Co Ltd Lining structure in pipe and molding method
JPS62141311A (ja) * 1985-12-17 1987-06-24 Dainippon Printing Co Ltd 軸受およびその製造方法
WO1990012226A1 (fr) * 1989-03-31 1990-10-18 Husted Royce Hill Arbre a came composite en plastique stabilise

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56146718A (en) * 1980-04-18 1981-11-14 Yamatake Honeywell Co Ltd Lining structure in pipe and molding method
JPS62141311A (ja) * 1985-12-17 1987-06-24 Dainippon Printing Co Ltd 軸受およびその製造方法
WO1990012226A1 (fr) * 1989-03-31 1990-10-18 Husted Royce Hill Arbre a came composite en plastique stabilise

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 029 (M - 113) 20 February 1982 (1982-02-20) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 368 (M - 647) 2 December 1987 (1987-12-02) *

Also Published As

Publication number Publication date
DE102004014363A1 (de) 2005-10-13

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