WO2022111747A1 - Roulement - Google Patents

Roulement Download PDF

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Publication number
WO2022111747A1
WO2022111747A1 PCT/DE2021/100802 DE2021100802W WO2022111747A1 WO 2022111747 A1 WO2022111747 A1 WO 2022111747A1 DE 2021100802 W DE2021100802 W DE 2021100802W WO 2022111747 A1 WO2022111747 A1 WO 2022111747A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner ring
insulating layer
ring
diameter
rolling bearing
Prior art date
Application number
PCT/DE2021/100802
Other languages
German (de)
English (en)
Inventor
Manfred Tietz
Norbert Metten
Paul WITTMANN
Eckhard RUSCHITZKA
Klaus PICHL
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2022111747A1 publication Critical patent/WO2022111747A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/30—Electric properties; Magnetic properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/80—Thermosetting resins
    • F16C2208/82—Composites, i.e. fibre reinforced thermosetting resins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/56—Tolerances; Accuracy of linear dimensions

Definitions

  • the invention relates to a roller bearing, comprising an outer ring, an inner ring and rolling elements arranged in between and rolling on raceways provided on the outer and inner rings.
  • Such rolling bearings are used in a wide variety of areas.
  • One example is the use in electric motors, which are also used in a wide variety of cases, increasingly in the automotive sector, for example, as drives for partially electric or fully electric ferry operations.
  • roller bearings are used for the rotary bearing of the rotor, which usually rotates at a high speed, which is why high-speed bearings are usually used, so-called high-speed motor bearings (HSMB).
  • HSMB high-speed motor bearings
  • the invention is therefore based on the problem of specifying a roller bearing that is improved in comparison.
  • a roller bearing of the type mentioned is characterized in that the outer ring on the outer circumference or the inner ring on the inner circumference is covered with an insulating layer made of a thermoset, the surface of which Setting the roundness of the outer or inner ring and a predetermined diameter of the outer or inner ring is machined by grinding.
  • an insulating layer made of a duroplast, ie a plastic, is used, which is applied, preferably sprayed, either to the outer circumference of the outer ring or to the inner circumference of the inner ring.
  • This insulating layer has sufficient electrical insulating properties so that it can reliably prevent the passage of current through the roller bearing.
  • a suitable resin can be used as the thermoset, for example an epoxy resin or a formaldehyde resin or materials based on this.
  • the surface of the applied insulating layer is machined or machined by grinding.
  • the insulating layer is processed in such a way that the outer circumference or the inner circumference of the insulating layer and thus the outer circumference of the bearing or the inner circumference of the bearing has the best possible roundness, apart from minimal tolerances.
  • the outer or inner diameter of the applied insulating layer and thus of the outer or inner ring or the outer or inner bearing diameter is also set with high precision by grinding.
  • roundness is defined as a deviation of the shape of the mechanically machined surface from an ideal cylindrical shape in any radial planes perpendicular to the axis of rotation of the roller bearing.
  • the roundness therefore stands for the deviation of the outer contour (in the case of an outer ring) and the inner contour (in the case of an inner ring) from an ideal cylindrical shape.
  • From the cylindrical shape deviating geometries are considered polyhedron-shaped, oval or wave-shaped geometries in cross-section in any perpendicular pierced by the axis of rotation of the Wälzla gers radial planes of the rolling bearing.
  • the deviation of the shape in any given radial plane should be within the limits of a defined ring surface, the outside and inside diameter of which are the permissible limits within which a permissible shape deviation may be due.
  • the permissible deviations from the cylindrical or circular Round shape are therefore based on the outer diameter (outer ring with coating on the outside) or inner diameter (inner ring with coating on the inside) in any radial plane within the limits of a ring surface.
  • the inner diameter of this ring surface specifies the inner tolerance limit for roundness and corresponds to the smallest permissible outer diameter tolerance of the outer ring with coating.
  • the outer diameter of this ring surface is determined by the maximum permissible value of the diameter tolerance of the outer ring with the outer coating.
  • the outer contour of the outer ring with the insulating layer may deviate from the purely cylindrical or circular shape.
  • the values are based on the smallest and largest inner diameter of the inner coating of the inner ring.
  • the roundness should be less than or equal to 0.006 mm.
  • this mechanical grinding process means that the finished roller bearing on the side provided with the insulating layer has a roundness and diameter accuracy like a normal bearing of this size, for example a bearing that has been used up to now and has, for example, ceramic rolling elements or the oxide ceramic coating.
  • the rolling bearing according to the invention or the duroplastic insulating layer is processed in such a way that the bearing dimensions correspond exactly to those of the bearing used previously, so that easy replacement is possible and no adjustments need to be made to the end shield or the bearing mount on the component to be stored.
  • the roller bearing according to the invention is therefore exactly the same as the dimensions of the bearing used previously and has tolerances in terms of roundness and diameter that correspond to those of the original bearing.
  • the roller bearing according to the invention is significantly simpler to manufacture, since no insulating ceramic means have to be provided to form the insulation level. Instead, an insulating duroplastic material is used, which can be applied in a simple manner, for example by spraying that can be suitably machined to produce the required dimensions and that exhibits the required mechanical properties.
  • the insulating layer only to the outer circumference of the outer ring or the inner circumference of the inner ring.
  • the insulating layer on the end faces can be mechanically processed by grinding in such a way that the width of the coated outer or inner ring essentially corresponds to that of the uncoated inner or outer ring, but this is not mandatory, especially if a different width is required due to the space available .
  • the coated outer or inner ring based on its outer or inner diameter, must be designed differently compared to another uncoated ring, since the insulating layer is applied as described, which has a thickness in the range of 0.5-1.5 mm, for example having.
  • this variant of the invention now provides for the insulating layer to also extend to the two end faces.
  • the width of the respective outer or inner ring can then also be reduced in comparison to an uncoated ring, in order to then also machine the width of the coated outer or inner ring by grinding in accordance with the uncoated ring, if this is required is.
  • the ring widths including the coating can also differ in width.
  • the grinding is carried out in such a way that the corresponding dimensions correspond to those of a comparison bearing with uncoated rings, also with regard to the tolerance range.
  • the tolerance of the diameter of the insulating layer of the coated outer or inner ring should be between -0.005 mm and -0.015 mm, in particular -0.01 mm, based on a predetermined target diameter.
  • minimum tolerances are defined here, since this also means that the running accuracy of the bearing raceway of the coated outer ring to the outer diameter of the outer ring or the bearing raceway of the coated inner ring to the inner diameter of the inner - is defined around.
  • the high-precision grinding according to the invention makes it possible, please include the tolerances of the dimensions in relation to the outer or inner diameter and the roundness to be realized in such a way as they are given in a comparable, but for example non-insulated bearing or high-speed bearing.
  • the tolerance of the width of the coated outer or inner ring should be between -0.05 mm and -0.15 mm, in particular -0.12 mm, in relation to a predetermined target width.
  • grinding is carried out with sufficient accuracy, but the tolerance requirements are not as strict as with regard to the diameter and thus the roundness.
  • At least one circumferential annular groove which is filled with the insulating layer, on the coated outer circumference or on the coated inner circumference of the outer or inner ring.
  • the insulating layer therefore engages in the ring groove, which is also used to anchor it to the respective bearing ring, on the one hand by enlarging the interface between the ring and the insulating layer and on the other hand by the fact that there is a form-fitting bond.
  • the insulating layer is expediently sprayed on, so it can be easily applied with a suitable spray tool and, after curing, can be sanded accordingly.
  • a fiber-reinforced thermoset in particular a glass-fiber-reinforced thermoset, is preferably used in order to adjust the mechanical properties of the insulating layer or to adapt it to the requirements.
  • roller bearing itself is expediently a high-speed bearing, as is used in electric motors. However, it can also be a standard bearing, since it is used in a flow-critical area but is exposed to lower speeds.
  • the invention relates to the use of a roller bearing of the type described above.
  • a roller bearing can preferably be used as a bearing for a rotating component of an electric motor, in particular as a rotor bearing. In this case, it serves as a high-speed bearing or HSMB bearing.
  • HSMB bearing high-speed bearing
  • the invention also relates to a method for producing an outer or inner ring covered with an insulating layer for a roller bearing of the type described above. Accordingly, an insulating layer made of a possibly fiber-reinforced thermoset is applied to the outer circumference of the outer ring or the inner circumference of the inner ring applied, in particular sprayed on, which is mechanically processed by grinding on the surface to set the roundness of the outer or inner ring and a predetermined diam sers of the outer or inner ring.
  • the insulating layer to the two end faces of the outer or inner ring at least in sections, the insulating layer also being ground to a predetermined value on the end faces to adjust the width of the outer or inner ring.
  • the surface is expediently ground in such a way that the tolerance of the diameter of the coated outer or inner ring is between -0.005 mm and -0.015 mm, in particular -0.01 mm, based on a predetermined target diameter. This means that there is almost complete roundness, since the diameter tolerance is extremely small.
  • the tolerance of the width of the coated outer or inner ring should be between -0.05 mm and -0.15 mm, in particular - 0.12 mm in relation to a predetermined target width.
  • Figure 1 is a schematic representation of a roller bearing according to the invention of a first embodiment, in section,
  • FIG. 2 is a schematic representation of a rolling bearing according to the invention of a second embodiment, in a sectional partial view
  • FIG. 3 shows a schematic diagram of a third embodiment of a roller bearing according to the invention, in a sectional partial view.
  • Figure 1 shows a rolling bearing 1 according to the invention, comprising an outer ring 2 with a raceway 3 and an inner ring 4 with a raceway 5, and with a rim comprising a plurality of rolling elements 7 held in a cage 6, here in the form of balls, which are on the raceways 3, 5 roll.
  • the roller bearing 1 is, for example, a high-speed bearing, as can be used, for example, to mount a rotor of an electric machine.
  • Such a bearing can be made without seals, as shown, in the case of an oil-lubricated application.
  • the bearing can also be filled with grease and also closed axially on both sides via seals, for which purpose corresponding measurements on the rings are provided for the annular seals.
  • the inner diameter of the inner ring 4 is slightly increased for this purpose compared to a bearing or inner ring that can be used for the same purpose.
  • the insulating layer 8 it stretches not only over the inner lateral surface, but also over the two end faces 10 and overlaps them partially.
  • the insulating layer 8 is machined on its surface 11, 12 on the inner circumference and on the end faces by grinding.
  • the surface 11 on the inner circumference is processed in such a way that the insulating layer 8 has the best possible roundness (preferably less than or equal to 0.006 mm), which means that the inner diameter has a minimum tolerance in the range between -0.005 mm and -0.015 mm be around -0.01 mm.
  • this roller bearing 1 according to the invention provided with the insulating layer 8 corresponds to the inner diameter of a comparable high-speed bearing that can be replaced identically for the intended purpose and has an uncoated inner ring, so that the roller bearing according to the invention 1 can be used in exchange for the previously used roller bearing that has no or an integrated insulating level of whatever type.
  • the surface 12 on the end faces is also ground accordingly in order to adapt the width of the inner ring 4 together with the insulating layer 8 to the width of the outer ring 2, as is clearly shown in FIG.
  • the tolerance in relation to the width should be between -0.05 mm and -0.15 mm in relation to a predetermined target width, which ultimately depends on the width of the Outer ring 2 is specified amount.
  • the thickness of the insulating layer 8 is dimensioned in such a way that the roller bearing is given the best possible current insulation against the passage of current, while at the same time the inner diameter of the metal inner ring 10 or its width is increased as little as possible.
  • the high-precision grinding with the lowest possible roughness, in particular of the inner peripheral surface 11 as a whole, serves to ensure the high running accuracy of the raceway 5 of the inner ring 4 with respect to the inner diameter of the inner ring.
  • thermoset is one with sufficient electrical insulation properties. It can be, for example, an epoxy resin or a formaldehyde resin, for example phenol-formaldehyde resin or melamine-formaldehyde resin.
  • the duroplast is preferably fiber-reinforced, for which glass fibers are suitable, but carbon fibers are also possible.
  • FIG. 2 shows a sectional partial view of a roller bearing 1 according to the invention in a second embodiment, with comparable components having the same reference numbers.
  • an insulating layer 8 made of a duroplastic 9 is applied to the inner circumference of the inner ring 4 .
  • This insulating layer 8 extends from the inner circumference to the end faces 10 of the inner ring 4 and occupies them in sections.
  • the surface of the insulating layer 8 is also ground accordingly to set the required dimensions in connection with the given tolerances.
  • the inner ring 4 has an annular groove 13 on its inner circumference, which is filled with the insulating layer 8 or the thermoplast 9 . This achieves an even better anchoring of the insulating layer 8 on the one hand due to the larger contact surface and on the other hand due to the shape circuit.
  • the configuration according to FIG. 3 shows a roller bearing 1 according to the invention, again with an outer ring 2, an inner ring 4 and rolling elements 7 rolling in between and guided in a cage 6.
  • the insulating layer 8 is made of the preferably fiber-reinforced duroplast 9 on the outer circumference of the outer ring 2 brought up. This is slightly reduced in its outer diameter, as well as in width, so that the insulating layer 8 can be applied.
  • the insulating layer 8 again stretches slightly over the end faces 14 of the outer ring 1.
  • a circumferential annular groove 15 is also formed on the outer ring 1, which, similar to the exemplary embodiment according to FIG.
  • the surface 16 on the outer circumference of the insulating layer 8 and the surface 17 on the end faces are mechanically reworked by grinding.
  • the surface 16 on the outer circumference is in turn ground with high precision in order to ensure the best possible roundness of the outer circumference or of the coated outer ring 2, while at the same time having a minimum tolerance in the outer diameter.
  • the surfaces 17 are ground in such a way that the width of the coated outer ring 2 also corresponds to the width of the inner ring 3 here.
  • the geometry and dimensions of the coated outer ring 2 or the coated inner ring 3 correspond exactly to an uncoated outer or inner ring of a roller bearing, which can be used in the same place, i.e. for the same purpose, and that has no insulating coating on any of its rings. Because the roller bearing according to the invention makes it possible to be able to be mounted instead of a previously installed roller bearing, ie instead of a roller bearing whose outer ring has no outer coating or whose inner ring has no inner coating.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

L'invention concerne un roulement comprenant une bague extérieure (2), une bague intérieure (4) et des éléments de roulement (7) roulant sur des chemins de roulement (3, 5) disposés sur les bagues extérieure et intérieure (2, 4), la circonférence extérieure de la bague extérieure (2) ou la circonférence intérieure de la bague intérieure (4) étant enrobée d'une couche isolante (8) constituée d'une résine thermodurcissable (9) dont la surface (11) est usinée par meulage afin d'ajuster la rondeur de la bague extérieure ou intérieure (2, 4) et un diamètre prédéfini de la bague extérieure ou intérieure (2, 4).
PCT/DE2021/100802 2020-11-24 2021-10-06 Roulement WO2022111747A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020131018.8A DE102020131018A1 (de) 2020-11-24 2020-11-24 Wälzlager
DE102020131018.8 2020-11-24

Publications (1)

Publication Number Publication Date
WO2022111747A1 true WO2022111747A1 (fr) 2022-06-02

Family

ID=78302633

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2021/100802 WO2022111747A1 (fr) 2020-11-24 2021-10-06 Roulement

Country Status (2)

Country Link
DE (1) DE102020131018A1 (fr)
WO (1) WO2022111747A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022115625A1 (de) 2022-06-23 2023-12-28 Schaeffler Technologies AG & Co. KG Wälzlager, Spritzgusswerkzeug und Verfahren zur Herstellung eines Innenrings und/oder Außenrings

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022125590A1 (de) 2022-10-05 2024-04-11 Schaeffler Technologies AG & Co. KG Wälzlager und Verfahren zur Herstellung eines Wälzlagers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001355639A (ja) * 2000-06-13 2001-12-26 Nsk Ltd 軸受装置
US20150252840A1 (en) * 2012-10-12 2015-09-10 Schaeffler Technologies Gmbh & Co. Kg Bearing lubricated with a medium
DE102016217366A1 (de) * 2016-09-13 2018-03-15 Schaeffler Technologies AG & Co. KG Lagerring mit einer elektrisch isolierenden Beschichtung sowie Verfahren zur Herstellung einer elektrisch isolierenden Beschichtung
US20180128317A1 (en) * 2016-11-07 2018-05-10 Aktiebolaget Skf Coating method for bearing ring

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001355639A (ja) * 2000-06-13 2001-12-26 Nsk Ltd 軸受装置
US20150252840A1 (en) * 2012-10-12 2015-09-10 Schaeffler Technologies Gmbh & Co. Kg Bearing lubricated with a medium
DE102016217366A1 (de) * 2016-09-13 2018-03-15 Schaeffler Technologies AG & Co. KG Lagerring mit einer elektrisch isolierenden Beschichtung sowie Verfahren zur Herstellung einer elektrisch isolierenden Beschichtung
US20180128317A1 (en) * 2016-11-07 2018-05-10 Aktiebolaget Skf Coating method for bearing ring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022115625A1 (de) 2022-06-23 2023-12-28 Schaeffler Technologies AG & Co. KG Wälzlager, Spritzgusswerkzeug und Verfahren zur Herstellung eines Innenrings und/oder Außenrings

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