WO2010031702A1 - Sliding disk in a clamping body overrunning clutch - Google Patents

Sliding disk in a clamping body overrunning clutch Download PDF

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Publication number
WO2010031702A1
WO2010031702A1 PCT/EP2009/061486 EP2009061486W WO2010031702A1 WO 2010031702 A1 WO2010031702 A1 WO 2010031702A1 EP 2009061486 W EP2009061486 W EP 2009061486W WO 2010031702 A1 WO2010031702 A1 WO 2010031702A1
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WO
WIPO (PCT)
Prior art keywords
sliding
oil grooves
sliding disk
layer
washer according
Prior art date
Application number
PCT/EP2009/061486
Other languages
German (de)
French (fr)
Inventor
Tomas Smetana
Original Assignee
Schaeffler Kg
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Filing date
Publication date
Application filed by Schaeffler Kg filed Critical Schaeffler Kg
Publication of WO2010031702A1 publication Critical patent/WO2010031702A1/en

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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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/069—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by pivoting or rocking, e.g. sprags
    • F16D41/07—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by pivoting or rocking, e.g. sprags between two cylindrical surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
    • 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
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • 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
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • 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
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in
    • 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
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • 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
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
    • F16C2223/16—Hardening, e.g. carburizing, carbo-nitriding with carbo-nitriding
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D2041/0601—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with a sliding bearing or spacer

Definitions

  • the invention relates to a sliding washer made of sheet steel for the arrangement between see an inner ring and an outer ring of a sprag clutch with a radially extending portion and at its inner edge and outer edge adjoining axial sections, each having an inner surface and an outer surface. Furthermore, the invention relates to a method for producing the sliding disk and the use of different types of steel for the sliding disk.
  • a sliding disk of the type mentioned above is known for example from DE 10 2005 046 799 A1.
  • This sliding disk has a nickel-phosphor coating, whereby very good wear properties are achieved, which is given because of the use of steel as the base material of the sliding disk, the same coefficient of expansion as for the other steel components of the sprag free-wheel clutch.
  • This nickel-phosphorus coating has proven itself, but is expensive to manufacture, albeit less expensive than the production of sliding plates made of a copper alloy, which is described for example in DE 299 04 524 U1.
  • the invention is therefore the object of a sliding washer for a freewheel clutch, which is operated under changing conditions, in particular fluctuating temperatures, in terms of manufacturing costs to improve.
  • At least the outer surfaces of the axial section of the sliding disk adjoining the inner edge and outer edge of the radially extending section are provided with a nitrogen and carbon-enriched, wear-resistant and corrosion-resistant edge layer produced by nitrocarburizing.
  • Nitrocarburizing is a thermochemical process for enriching the surface layer of a workpiece with nitrogen and carbon. This results in a nitriding layer, consisting of bonding layer and diffusion layer.
  • the enrichment of the surface layer of a workpiece with nitrogen and carbon can be carried out by means of gas-nitrucarburizing, salt bath-nitrocarburizing or plasma-nitrocarburizing.
  • the gas nitrocarburizing is carried out at temperatures between 500 ° C and 600 ° C in a gas mixture which can deliver nitrogen (eg ammonia) and carbon (eg carbon dioxide). The aim is to improve the wear resistance and corrosion resistance of low to medium alloy steels.
  • salt bath nitrocarburizing components made from low to medium alloy steels and cast iron are treated in a molten salt bath at temperatures of 550 ° C to 630 ° C. Advantages of the method are the short treatment time and the high wear resistance and corrosion resistance produced. As Salzbadkomponenten serve Alkalicyanate and alkali carbonates, the spent salts can be post-dosed during the reaction. By means of the Plasma nitrocarburizing also allows hardening of highly alloyed steels in the surface layer. The components are treated at temperatures of 350 ° C to 600 ° C with ionized gas. As a rule, no mechanical aftertreatment of the parts is required.
  • the sliding washer according to the invention of nitrocarburized steel sheet is cheaper to produce than a sliding disk made of bronze-plated steel sheet, nickel-phosphorus-coated steel sheet or solid bronze.
  • the edge layer consisting of a connecting layer and a diffusion layer preferably has a thickness of approx. 10 ⁇ m, through which a wear-resistant composite layer having a hardness of at least 400 HV and a mass fraction of approx. 1% carbon and approx. 15% nitrogen. Since the nitrocarburizing is carried out at a temperature of preferably 550 ° C, the delay of the sliding disk is minimal.
  • the high nitrogen content ensures very good wear and friction properties, as has been shown by vibration friction wear tests on samples of the sliding disks made of different materials.
  • the nitrocarburized samples of the steel grades C16M or 16MnCr5 have hardly any wear in comparison to sliding disks made of brass or bronze.
  • the running behavior is constant without tarnish or galling sensation.
  • the sliding disks generally have slightly conical outer surfaces after production of the axial sections adjoining the radially extending section. Idle wear tests on such sliding disks show that the conicity can cause a lubricant film interruption. In this case, a mixed friction state prevails in the load zone, which leads to the temperature rise and to an increase in wear. Since the oil in freewheel is thrown radially outward on contact with a rotating sliding disk, the sliding disk can run dry in the load zone, whereby a further increase in temperature and an increase in wear occur.
  • At least the outer surface of the axial section adjoining the inner edge of the radial section is provided with a plurality of preferably uniformly spaced, axially extending oil grooves, the number of oil grooves resulting from the fact that in a zone of the sliding plate with minimal load at least three oil grooves are present.
  • This means that nine oil grooves for sliding disks with a diameter suitable for conventional sprag-type one-way clutches are generally sufficient, whereby the surface pressure in the remaining areas of the sliding disk does not increase significantly.
  • the width of the oil grooves can be about 3 mm and the depth of about 0.6 mm, whereby a sufficient oil supply to the contact surface in the load zone and a hydrodynamic lubricating film structure are ensured. This oil also causes sufficient cooling of the highly stressed inner race of the sliding disk.
  • the preparation of the lubrication grooves can be integrated in a simple manner and cost neutral by forming associated webs in the thermoforming tool, which is minimized by a circular segment-shaped cross section of the oil grooves of the wear of the thermoforming tool.
  • the sliding disk with the features listed above can advantageously be produced by deep-drawing means of a deep-drawing tool from a sheet steel blank, after which the nitrocarburizing is subsequently carried out.
  • the oil grooves can be during deep drawing by the deep drawing tool in the outer surface of the adjoin the inner edge of the radial portion, axial section, whereby the tool cost, although slightly increase, but not the Herstell cost.
  • the nitrocarburizing of the sliding disk can also be combined with carbonitriding, which further improves the wear and friction properties become.
  • Carbonitriding is also one of the thermochemical processes that enriches the surface layer of components with carbon and nitrogen and improves the mechanical properties of the component edge layer.
  • the carbonitriding curing temperatures are generally between 760 ° C and 900 ° C, i. higher than the Nitrocarbuheren.
  • the effect of carbonitriding is based on carbon diffusion and nitrogen diffusion at the same time. By enrichment of nitrogen, the hardening temperature and the critical cooling rate are lowered, so that it can be quenched milder. Both factors reduce the risk of default.
  • Subsequent tempering treatment sets the desired surface hardness. For carbonitriding, unalloyed and low-alloyed case-hardened steels as well as free-cutting steels and structural steels are suitable. These are generally steels with carbon contents below 0.2%. Carbonitriding serves to give the surface layer of steel workpieces and tools a much higher hardness and better mechanical properties to the workpieces or tools. Carbonitriding results in increased wear resistance with simultaneous low distortion.
  • the steel grades DC03, DC04, C16M, 16MnCr5 can be used particularly advantageously for producing a sliding disk with a nitrogen and carbon-enriched, wear-resistant and corrosion-resistant edge layer.
  • FIG. 1 is an exploded view of a sprag free-wheel clutch
  • Fig. 2 is a sectional view of a sliding disk of the sprag free-wheel clutch according to FIG. 1, and
  • FIG. 3 is a front view of the sliding disk according to FIG. 2.
  • Fig. 1 essential functional elements of a sprag free-wheel clutch 1 with the exception of an inner ring and an outer ring are visible.
  • a plurality of clamping bodies 2 is arranged in the annular gap space between the outer ring and the inner ring or a shaft.
  • the guide of the clamping body 2 is a made of plastic cage 3 with recesses 4 for each a clamping body 2. Radially inside the cage 3 is a biased against this spring band 5 with spring tongues 6, which the individual clamping body 2 anfedern. In this case, each clamping body 2 is acted upon by a force in the direction of its clamping position.
  • each have a sliding disk 8 can be snapped.
  • the sliding disk 8 is used to produce a plain bearing between the inner ring and the outer ring of the sprag free-wheel clutch 1 and is designed as formed by deep drawing sheet steel part.
  • the sliding disk 8 has a radially extending section 9 as well as adjoining, axially extending sections 10 and 11. Overall, the sliding disk 8 in longitudinal section so that the shape of a bent into a circle U-profile.
  • the axially extending radially inner portion 10 has an inner surface 13 and an outer surface 14, while the radially outer axial portion 11 has an inner surface 15 and an outer surface 16.
  • the outer surface 14 causes a sliding bearing to the inner ring and the outer surface 16 has a sliding bearing to the outer ring of the sprag free-wheel clutch. 1
  • the radially inwardly facing outer surface 14 is the highly stressed inner race of the sliding disk, which requires special lubrication and cooling.
  • the outer surface 14 has regularly spaced, axially extending oil grooves 12, the number of which is sized to have at least three grooves in the minimum load zone to provide oil to the contact surface, to aid in hydrodynamic lubrication film buildup, and To cool the highly stressed inner race of the sliding disk.
  • the width of the oil grooves is about 3 mm and the depth about 0.6 mm.
  • At least the outer surfaces 14 and 16 of the axial cuts 10 and 11, preferably the entire surface of the sliding disk, are provided with a nitrogen and carbon enriched, wear and corrosion resistant edge layer by nitrocarburizing.
  • This surface layer has a hardness of at least 400 HV and a mass fraction of about 1% carbon and 10 to 15% nitrogen.
  • Nitrocarburizing (standard designation M6) can also be combined with carbonitriding (standard designation X6) in order to further improve the wear and friction properties without a significant distortion of the sliding disk 8 occurring as a result of this thermochemical treatment.
  • the steel grades DC03, DC04, C16N, 16MnCr5 can preferably be used.
  • the illustrated embodiment shows a longitudinal section C-shaped sliding disk 8, but is also the optimized sliding washer for a sprag freewheel in sigma form, which is described in DE 10 2006 023 564 A1 of the same Applicant, very well suited as a sliding washer according to the invention , which is stiffness-optimized and has a lower distortion due to the thermochemical treatment.
  • the oil grooves 12 for the oil passage at the edge of the sliding disk 8 are in terms of lubricant supply and cooling of the highly stressed inner race surface of the sliding disk 8 optimally, but may have an increased surface pressure result. However, this is associated with no disadvantage, since the enriched with nitrogen and carbon surface layer prevents overuse of the sliding disk 8.
  • the inventive thermo-chemical treatment of the sliding disk 8 thus the advantages of the axial oil grooves 12 come fully into play.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Operated Clutches (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

The invention relates to a sliding disk (8) made from a steel sheet for arrangement between an inner ring and an outer ring of a clamping body overrunning clutch (1), having a radially extending section (9) and axial sections (10, 11) which are connected to the inner edge and outer edge of said radially extending section and which each have an inner surface (13, 15) and an outer surface (14, 16), wherein at least the outer surfaces (14, 16) comprise a wear- and corrosion-resistant surface layer produced by nitrocarburization and enriched with nitrogen and carbon. The invention further relates to a method for producing such a sliding disk (8), wherein the sliding disk (8) is produced from a steel sheet circular blank by deep-drawing by means of a deep-drawing tool, and then the nitrocarburization is performed.

Description

Beschreibung description
Bezeichnung der ErfindungName of the invention
Gleitscheibe in einer Klemmkörper-FreilaufkupplungSliding disc in a sprag clutch
Gebiet der ErfindungField of the invention
Die Erfindung betrifft eine Gleitscheibe aus Stahlblech zur Anordnung zwi- sehen einem Innenring und einem Außenring einer Klemmkörper- Freilaufkupplung mit einem radial verlaufenden Abschnitt sowie an dessen inneren Rand und äußeren Rand anschließenden axialen Abschnitten, mit jeweils einer Innenfläche und einer Außenfläche. Weiter betrifft die Erfindung ein Verfahren zur Herstellung der Gleitscheibe und die Verwendung verschiedener Stahlsorten für die Gleitscheibe.The invention relates to a sliding washer made of sheet steel for the arrangement between see an inner ring and an outer ring of a sprag clutch with a radially extending portion and at its inner edge and outer edge adjoining axial sections, each having an inner surface and an outer surface. Furthermore, the invention relates to a method for producing the sliding disk and the use of different types of steel for the sliding disk.
Hintergrund der ErfindungBackground of the invention
Eine Gleitscheibe der eingangs erwähnten Art ist beispielsweise aus der DE 10 2005 046 799 A1 bekannt. Diese Gleitscheibe weist eine Nickel-Phosphor- Beschichtung auf, wodurch sehr gute Verschleißeigenschaften erreicht werden, wobei wegen der Verwendung von Stahl als Grundwerkstoff der Gleitscheibe der gleiche Ausdehnungskoeffizient wie für die übrigen Stahlbestandteile der Klemmkörper-Freilaufkupplung gegeben ist. Diese Nickel-Phosphor- Beschichtung hat sich bewährt, ist aber in der Herstellung kostenintensiv, wenn auch kostengünstiger als die Herstellung von Gleitscheiben aus einer Kupferlegierung, die beispielsweise in der DE 299 04 524 U1 beschrieben ist.A sliding disk of the type mentioned above is known for example from DE 10 2005 046 799 A1. This sliding disk has a nickel-phosphor coating, whereby very good wear properties are achieved, which is given because of the use of steel as the base material of the sliding disk, the same coefficient of expansion as for the other steel components of the sprag free-wheel clutch. This nickel-phosphorus coating has proven itself, but is expensive to manufacture, albeit less expensive than the production of sliding plates made of a copper alloy, which is described for example in DE 299 04 524 U1.
Aufgabe der ErfindungObject of the invention
Der Erfindung liegt dementsprechend die Aufgabe zugrunde, eine Gleitscheibe für eine Freilauf-Kupplung, die unter wechselnden Bedingungen, insbesondere schwankenden Temperaturen, betrieben wird, hinsichtlich der Herstell kosten zu verbessern.The invention is therefore the object of a sliding washer for a freewheel clutch, which is operated under changing conditions, in particular fluctuating temperatures, in terms of manufacturing costs to improve.
Zusammenfassung der ErfindungSummary of the invention
Diese Aufgabe wird erfindungsgemäß gelöst durch eine Gleitscheibe mit den Merkmalen des Anspruchs 1 , durch ein Verfahren mit den Merkmalen des Anspruchs 10, sowie durch die Verwendung von bestimmten Stahlsorten zur Herstellung der Gleitscheibe gemäß dem Anspruch 13. Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den abhängigen Ansprüchen 2 bis 9 so- wie 11 und 12.This object is achieved by a sliding disk with the features of claim 1, by a method having the features of claim 10, and by the use of certain steel grades for the production of the sliding disk according to claim 13. Advantageous embodiments of the invention will become apparent from the dependent Claims 2 to 9 and 11 and 12.
Erfindungsgemäß sind wenigstens die Außenflächen der sich am inneren Rand und äußeren Rand des radial verlaufenden Abschnitts anschließenden axialen Abschnitt der Gleitscheibe mit einer durch Nitrocarburieren erzeugten, mit Stickstoff und Kohlenstoff angereicherten, verschleiß- und korrosionsfesten Randschicht versehen.According to the invention, at least the outer surfaces of the axial section of the sliding disk adjoining the inner edge and outer edge of the radially extending section are provided with a nitrogen and carbon-enriched, wear-resistant and corrosion-resistant edge layer produced by nitrocarburizing.
Das Nitrocarburieren ist ein thermochemisches Verfahren zum Anreichern der Randschicht eines Werkstücks mit Stickstoff und Kohlenstoff. Es entsteht dabei eine Nitrierschicht, bestehend aus Verbindungsschicht und Diffusionsschicht. Das Anreichern der Randschicht eines Werkstücks mit Stickstoff und Kohlenstoff lässt sich mittels Gas-Nitrucarburieren, Salzbad-Nitrocarburieren oder Plasma-Nitrocarburieren durchführen. Das Gas-Nitrocarburieren wird bei Temperaturen zwischen 500° C und 600° C in einem Gasgemisch, das Stickstoff (z.B. Ammoniak) und Kohlenstoff (z.B. Kohlendioxid) abgeben kann, durchgeführt. Ziel ist es, die Verschleißfestigkeit und die Korrosionsbeständigkeit von niedrig- bis mittel legierten Stählen zu verbessern. Beim Salzbad- Nitrocarburieren werden Bauteile aus niedrig- bis mittellegierten Stählen und Gusseisen in einer Salzschmelze bei Temperaturen von 550° C bis 630° C behandelt. Als Vorteile des Verfahrens gelten die kurze Behandlungsdauer sowie die hohe erzeugte Verschleißbeständigkeit und Korrosionsbeständigkeit. Als Salzbadkomponenten dienen Alkalicyanate sowie Alkalicarbonate, die verbrauchten Salze können während der Reaktion nachdosiert werden. Mittels des Plasma-Nitrocarburieren lassen sich auch hoch legierte Stähle in der Randschicht härten. Die Bauteile werden bei Temperaturen von 350° C bis 600° C mit ionisiertem Gas behandelt. In der Regel ist keine mechanische Nachbehandlung der Teile erforderlich.Nitrocarburizing is a thermochemical process for enriching the surface layer of a workpiece with nitrogen and carbon. This results in a nitriding layer, consisting of bonding layer and diffusion layer. The enrichment of the surface layer of a workpiece with nitrogen and carbon can be carried out by means of gas-nitrucarburizing, salt bath-nitrocarburizing or plasma-nitrocarburizing. The gas nitrocarburizing is carried out at temperatures between 500 ° C and 600 ° C in a gas mixture which can deliver nitrogen (eg ammonia) and carbon (eg carbon dioxide). The aim is to improve the wear resistance and corrosion resistance of low to medium alloy steels. In salt bath nitrocarburizing, components made from low to medium alloy steels and cast iron are treated in a molten salt bath at temperatures of 550 ° C to 630 ° C. Advantages of the method are the short treatment time and the high wear resistance and corrosion resistance produced. As Salzbadkomponenten serve Alkalicyanate and alkali carbonates, the spent salts can be post-dosed during the reaction. By means of the Plasma nitrocarburizing also allows hardening of highly alloyed steels in the surface layer. The components are treated at temperatures of 350 ° C to 600 ° C with ionized gas. As a rule, no mechanical aftertreatment of the parts is required.
Insbesondere ist die erfindungsgemäße Gleitscheibe aus nitrocarburiertem Stahlblech günstiger herstellbar als eine Gleitscheibe aus bronzeplattiertem Stahlblech, nickelphosphorbeschichteten Stahlblech oder Vollbronze.In particular, the sliding washer according to the invention of nitrocarburized steel sheet is cheaper to produce than a sliding disk made of bronze-plated steel sheet, nickel-phosphorus-coated steel sheet or solid bronze.
Vorzugsweise weist die aus einer Verbindungsschicht und einer Diffusionsschicht bestehende Randschicht eine Dicke von ca. 10 μm auf, durch die eine verschleißfeste Verbundschicht gebildet wird, welche eine Härte von mindestens 400 HV aufweist und einen Massenanteil von ca. 1 % Kohlenstoff und ca. 10 - 15 % Stickstoff enthält. Da das Nitrocarburieren bei einer Temperatur von vorzugsweise 550° C erfolgt, ist der Verzug der Gleitscheibe nur minimal.The edge layer consisting of a connecting layer and a diffusion layer preferably has a thickness of approx. 10 μm, through which a wear-resistant composite layer having a hardness of at least 400 HV and a mass fraction of approx. 1% carbon and approx. 15% nitrogen. Since the nitrocarburizing is carried out at a temperature of preferably 550 ° C, the delay of the sliding disk is minimal.
Der hohe Stickstoffgehalt sorgt für sehr gute Verschleiß- und Reibeigenschaften, wie sich aus Schwingungsreibverschleißuntersuchungen an Proben der Gleitscheiben aus unterschiedlichen Werkstoffen ergeben hat. Die nitrocarbu- rierten Proben aus der Stahlsorte C16M bzw. 16MnCr5 weisen im Vergleich zu Gleitscheiben aus Messing oder Bronze kaum Verschleiß auf. Darüber hinaus ist das Laufverhalten konstant ohne Anlauf- bzw. Fresserscheinungen.The high nitrogen content ensures very good wear and friction properties, as has been shown by vibration friction wear tests on samples of the sliding disks made of different materials. The nitrocarburized samples of the steel grades C16M or 16MnCr5 have hardly any wear in comparison to sliding disks made of brass or bronze. In addition, the running behavior is constant without tarnish or galling sensation.
Die Gleitscheiben weisen nach der Fertigung in der Regel leicht konische Au- ßenflächen der sich an den radial verlaufenden Abschnitt anschließenden axialen Abschnitte auf. Leerlaufverschleißversuche an derartigen Gleitscheiben zeigen, dass die Konizität eine Schmierfilmunterbrechung bewirken kann. In diesem Fall herrscht in der Lastzone ein Mischreibungszustand, der zum Temperaturanstieg und zu einer Zunahme des Verschleißes führt. Da das Öl in Freilauf beim Kontakt mit einer rotierenden Gleitscheibe nach radial außen geschleudert wird, kann die Gleitscheibe in der Lastzone trocken laufen, wodurch ein weiterer Temperaturanstieg und eine Zunahme des Verschleißes eintreten. Um dies zu vermeiden, ist wenigstens die Außenfläche des sich am inneren Rand des radialen Abschnitts anschließenden axialen Abschnitts mit einer Mehrzahl vorzugsweise gleichmäßig beabstandeter, axial verlaufender Ölrillen versehen, wobei sich die Anzahl der Ölrillen daraus ergibt, dass in einer Zone der Gleitscheibe mit minimaler Last wenigstens drei Ölrillen vorhanden sind. Dies bedeutet, dass neun Ölrillen für Gleitscheiben mit einem für übliche Klemmkörper-Freilaufkupplungen geeigneten Durchmesser in der Regel ausreichend sind, wodurch die Flächenpressung in den übrigen Bereichen der Gleitscheibe nicht wesentlich zunimmt.The sliding disks generally have slightly conical outer surfaces after production of the axial sections adjoining the radially extending section. Idle wear tests on such sliding disks show that the conicity can cause a lubricant film interruption. In this case, a mixed friction state prevails in the load zone, which leads to the temperature rise and to an increase in wear. Since the oil in freewheel is thrown radially outward on contact with a rotating sliding disk, the sliding disk can run dry in the load zone, whereby a further increase in temperature and an increase in wear occur. In order to avoid this, at least the outer surface of the axial section adjoining the inner edge of the radial section is provided with a plurality of preferably uniformly spaced, axially extending oil grooves, the number of oil grooves resulting from the fact that in a zone of the sliding plate with minimal load at least three oil grooves are present. This means that nine oil grooves for sliding disks with a diameter suitable for conventional sprag-type one-way clutches are generally sufficient, whereby the surface pressure in the remaining areas of the sliding disk does not increase significantly.
Die Breite der Ölrillen kann ca. 3 mm und deren Tiefe ca. 0,6 mm betragen, wodurch eine ausreichende Ölversorgung der Kontaktfläche in der Lastzone und ein hydrodynamischer Schmierfilmaufbau gewährleistet sind. Dieses Öl bewirkt auch eine ausreichende Kühlung der hoch beanspruchten Innenlauffläche der Gleitscheibe.The width of the oil grooves can be about 3 mm and the depth of about 0.6 mm, whereby a sufficient oil supply to the contact surface in the load zone and a hydrodynamic lubricating film structure are ensured. This oil also causes sufficient cooling of the highly stressed inner race of the sliding disk.
Die Herstellung der Schmierrillen lässt sich auf einfache Weise und kostenneutral durch Ausbildung von zugeordneten Stegen in das Tiefziehwerkzeug integrieren, wobei durch einen kreissegmentförmigen Querschnitt der Ölrillen der Verschleiß des Tiefziehwerkzeugs minimiert wird.The preparation of the lubrication grooves can be integrated in a simple manner and cost neutral by forming associated webs in the thermoforming tool, which is minimized by a circular segment-shaped cross section of the oil grooves of the wear of the thermoforming tool.
Die Gleitscheibe mit den vorstehend aufgeführten Merkmalen lässt sich vorteilhafterweise durch Tiefziehmittel eines Tiefziehwerkzeugs aus einer Stahlblech- ronde herstellen, wonach anschließend das Nitrocarburieren durchgeführt wird.The sliding disk with the features listed above can advantageously be produced by deep-drawing means of a deep-drawing tool from a sheet steel blank, after which the nitrocarburizing is subsequently carried out.
Wie bereits erwähnt, lassen sich die Ölrillen beim Tiefziehen durch das Tiefziehwerkzeug in die Außenfläche des sich am inneren Rand des radialen Abschnitts anschließenden, axialen Abschnitts einbringen, wodurch sich die Werkzeug kosten zwar geringfügig erhöhen, nicht jedoch die Herstell kosten.As already mentioned, the oil grooves can be during deep drawing by the deep drawing tool in the outer surface of the adjoin the inner edge of the radial portion, axial section, whereby the tool cost, although slightly increase, but not the Herstell cost.
Das Nitrocarburieren der Gleitscheibe lässt sich auch mit dem Carbonitrieren kombinieren, wodurch die Verschleiß- und Reibeigenschaften weiter verbessert werden.The nitrocarburizing of the sliding disk can also be combined with carbonitriding, which further improves the wear and friction properties become.
Auch das Carbonitrieren zählt zu den thermochemischen Verfahren, durch das die Randschicht von Bauteilen mit Kohlen- und Stickstoff angereichert und die mechanischen Eigenschaften der Bauteilrandschicht verbessert werden. Die Temperaturen bei der Carbonitrierhärtung liegen im Allgemeinen zwischen 760° C und 900° C, d.h. höher als beim Nitrocarbuheren. Die Wirkung der Car- bonitrierung beruht auf Kohlenstoffdiffusion und gleichzeitig Stickstoffdiffusion. Durch Anreicherung von Stickstoff werden die Härtetemperatur und die kriti- sehe Abkühlgeschwindigkeit herabgesetzt, so dass milder abgeschreckt werden kann. Beide Faktoren verringern das Risiko des Verzugs. Mit einer anschließenden Anlassbehandlung wird die gewünschte Oberflächenhärte eingestellt. Für das Carbonitrieren eignen sich unlegierte und niedrig legierte Einsatzstähle sowie Automatenstähle und Baustähle. Dies sind im allgemeinen Stähle mit Kohlenstoffgehalten unter 0,2 %. Das Carbonitrieren dient dazu, der Randschicht von Werkstücken und Werkzeugen aus Stahl eine wesentlich höhere Härte und den Werkstücken bzw. Werkzeugen bessere mechanische Eigenschaften zu verleihen. Durch das Carbonitrieren entsteht ein erhöhter Verschleißwiderstand unter gleichzeitiger Verzugsarmut.Carbonitriding is also one of the thermochemical processes that enriches the surface layer of components with carbon and nitrogen and improves the mechanical properties of the component edge layer. The carbonitriding curing temperatures are generally between 760 ° C and 900 ° C, i. higher than the Nitrocarbuheren. The effect of carbonitriding is based on carbon diffusion and nitrogen diffusion at the same time. By enrichment of nitrogen, the hardening temperature and the critical cooling rate are lowered, so that it can be quenched milder. Both factors reduce the risk of default. Subsequent tempering treatment sets the desired surface hardness. For carbonitriding, unalloyed and low-alloyed case-hardened steels as well as free-cutting steels and structural steels are suitable. These are generally steels with carbon contents below 0.2%. Carbonitriding serves to give the surface layer of steel workpieces and tools a much higher hardness and better mechanical properties to the workpieces or tools. Carbonitriding results in increased wear resistance with simultaneous low distortion.
Dementsprechend lassen sich die Stahlsorten DC03, DC04, C16M, 16MnCr5 besonders vorteilhaft zur Herstellung einer Gleitscheibe mit einer mit Stickstoff und Kohlenstoff angereicherten, verschleiß- und korrosionsfesten Randschicht verwenden.Accordingly, the steel grades DC03, DC04, C16M, 16MnCr5 can be used particularly advantageously for producing a sliding disk with a nitrogen and carbon-enriched, wear-resistant and corrosion-resistant edge layer.
Kurze Beschreibung der ZeichnungShort description of the drawing
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand einer Zeich- nung näher erläutert. Hierin zeigtAn exemplary embodiment of the invention will be explained in more detail below with reference to a drawing. Herein shows
Fig. 1 in einer Explosionsdarstellung eine Klemmkörper-Freilaufkupplung, Fig. 2 eine Schnittansicht einer Gleitscheibe der Klemmkörper- Freilaufkupplung gemäß Fig. 1 , und1 is an exploded view of a sprag free-wheel clutch, Fig. 2 is a sectional view of a sliding disk of the sprag free-wheel clutch according to FIG. 1, and
Fig. 3 eine Vorderansicht der Gleitscheibe gemäß Fig. 2.3 is a front view of the sliding disk according to FIG. 2.
Detaillierte Beschreibung der ZeichnungenDetailed description of the drawings
In Fig. 1 sind wesentliche Funktionselemente einer Klemmkörper- Freilaufkupplung 1 mit Ausnahme eines Innenrings sowie eines Außenrings sichtbar. Eine Mehrzahl von Klemmkörpern 2 ist im ringförmigen Spaltraum zwischen dem Außenring und dem Innenring bzw. einer Welle angeordnet. Der Führung der Klemmkörper 2 dient ein aus Kunststoff gefertigter Käfig 3 mit Aussparungen 4 für jeweils einen Klemmkörper 2. Radial innerhalb des Käfigs 3 befindet sich ein gegen diesen vorgespanntes Federband 5 mit Federzungen 6, welche die einzelnen Klemmkörper 2 anfedern. Dabei wird jeder Klemmkörper 2 mit einer Kraft in Richtung zu dessen Klemmposition beaufschlagt.In Fig. 1 essential functional elements of a sprag free-wheel clutch 1 with the exception of an inner ring and an outer ring are visible. A plurality of clamping bodies 2 is arranged in the annular gap space between the outer ring and the inner ring or a shaft. The guide of the clamping body 2 is a made of plastic cage 3 with recesses 4 for each a clamping body 2. Radially inside the cage 3 is a biased against this spring band 5 with spring tongues 6, which the individual clamping body 2 anfedern. In this case, each clamping body 2 is acted upon by a force in the direction of its clamping position.
Auf umlaufende Borde 7 des Käfigs 3 ist jeweils eine Gleitscheibe 8 aufschnappbar. Die Gleitscheibe 8 dient der Herstellung einer Gleitlagerung zwi- sehen dem Innenring und dem Außenring der Klemmkörper-Freilaufkupplung 1 und ist als durch Tiefziehen geformtes Stahlblechteil ausgebildet.On revolving shelves 7 of the cage 3 each have a sliding disk 8 can be snapped. The sliding disk 8 is used to produce a plain bearing between the inner ring and the outer ring of the sprag free-wheel clutch 1 and is designed as formed by deep drawing sheet steel part.
Wie aus den Figuren 2 und 3 näher ersichtlich, weist die Gleitscheibe 8 einen radial verlaufenden Abschnitt 9 sowie an diesen anschließende, axial verlau- fende Abschnitten 10 und 11 auf. Insgesamt hat die Gleitscheibe 8 im Längsschnitt damit die Form eines zu einem Kreis gebogenen U-Profils.As can be seen in more detail from FIGS. 2 and 3, the sliding disk 8 has a radially extending section 9 as well as adjoining, axially extending sections 10 and 11. Overall, the sliding disk 8 in longitudinal section so that the shape of a bent into a circle U-profile.
Der axial verlaufende, radial innere Abschnitt 10 weist eine Innenfläche 13 und eine Außenfläche 14 auf, während der radial äußere axiale Abschnitt 11 eine Innenfläche 15 und eine Außenfläche 16 aufweist. Die Außenfläche 14 bewirkt eine Gleitlagerung zum Innenring und die Außenfläche 16 eine Gleitlagerung zum Außenring der Klemmkörper-Freilaufkupplung 1. Die radial nach innen weisende Außenfläche 14 ist die hoch beanspruchte Innenlauffläche der Gleitscheibe, die einer besonderen Schmierung und Kühlung bedarf. Aus diesem Grund weist die Außenfläche 14 regelmäßig beabstandete, axial verlaufende Ölrillen 12 auf, deren Anzahl danach bemessen wird, dass mindestens drei Rillen in der Zone mit der minimalen Last vorhanden sind, um die Kontaktfläche mit Öl zu versorgen, den hydrodynamischen Schmierfilmaufbau zu unterstützen und die hoch beanspruchte Innenlauffläche der Gleitscheibe zu kühlen. Die Breite der Ölrillen beträgt ca. 3 mm und die Tiefe ca. 0,6 mm.The axially extending radially inner portion 10 has an inner surface 13 and an outer surface 14, while the radially outer axial portion 11 has an inner surface 15 and an outer surface 16. The outer surface 14 causes a sliding bearing to the inner ring and the outer surface 16 has a sliding bearing to the outer ring of the sprag free-wheel clutch. 1 The radially inwardly facing outer surface 14 is the highly stressed inner race of the sliding disk, which requires special lubrication and cooling. For this reason, the outer surface 14 has regularly spaced, axially extending oil grooves 12, the number of which is sized to have at least three grooves in the minimum load zone to provide oil to the contact surface, to aid in hydrodynamic lubrication film buildup, and To cool the highly stressed inner race of the sliding disk. The width of the oil grooves is about 3 mm and the depth about 0.6 mm.
Mindestens die Außenflächen 14 und 16 der axialen Schnitte 10 und 11 , vorzugsweise die gesamte Oberfläche der Gleitscheibe, sind durch Nitrocarburie- ren mit einer mit Stickstoff und Kohlenstoff angereicherten, verschleiß- und korrosionsfester Randschicht versehen. Diese Randschicht weist eine Härte von mindestens 400 HV und einen Masseanteil von ca. 1 % Kohlenstoff und 10 bis 15 % Stickstoff auf.At least the outer surfaces 14 and 16 of the axial cuts 10 and 11, preferably the entire surface of the sliding disk, are provided with a nitrogen and carbon enriched, wear and corrosion resistant edge layer by nitrocarburizing. This surface layer has a hardness of at least 400 HV and a mass fraction of about 1% carbon and 10 to 15% nitrogen.
Das Nitrocarburieren (Normbezeichnung M6) lässt sich auch mit dem Carbo- nitrieren (Normbezeichnung X6) kombinieren, um die Verschleiß- und Reibei- genschaften noch weiter zu verbessern, ohne dass durch diese thermochemi- sche Behandlung ein nennenswerter Verzug der Gleitscheibe 8 eintritt. Zur Herstellung der erfindungsgemäßen Gleitscheibe 8 lassen sich vorzugsweise die Stahlsorten DC03, DC04, C16N, 16MnCr5 verwenden.Nitrocarburizing (standard designation M6) can also be combined with carbonitriding (standard designation X6) in order to further improve the wear and friction properties without a significant distortion of the sliding disk 8 occurring as a result of this thermochemical treatment. To produce the sliding disk 8 according to the invention, the steel grades DC03, DC04, C16N, 16MnCr5 can preferably be used.
Das dargestellte Ausführungsbeispiel zeigt eine im Längsschnitt C-förmige Gleitscheibe 8, jedoch ist auch die optimierte Gleitscheibe für einen Klemmkörper-Freilauf in Sigma-Form, die in der DE 10 2006 023 564 A1 der gleichen Anmelderin beschrieben ist, sehr gut als erfindungsgemäße Gleitscheibe geeignet, die steifigkeitsoptimiert ist und einen geringeren Verzug durch die ther- mochemische Behandlung aufweist.The illustrated embodiment shows a longitudinal section C-shaped sliding disk 8, but is also the optimized sliding washer for a sprag freewheel in sigma form, which is described in DE 10 2006 023 564 A1 of the same Applicant, very well suited as a sliding washer according to the invention , which is stiffness-optimized and has a lower distortion due to the thermochemical treatment.
Die Ölrillen 12 für den Öldurchtritt am Rand der Gleitscheibe 8 sind hinsichtlich der Schmiermittelversorgung und Kühlung der hochbeanspruchten Innenlauf- fläche der Gleitscheibe 8 optimal, können jedoch eine erhöhte Flächenpressung zur Folge haben. Dies ist aber mit keinem Nachteil verbunden, da die erfindungsgemäße, mit Stickstoff und Kohlenstoff angereicherte Randschicht eine Überbeanspruchung der Gleitscheibe 8 verhindert. Durch die erfindungsgemäße thermo-chemische Behandlung der Gleitscheibe 8 kommen somit die Vorteile der axialen Ölrillen 12 voll zum Tragen. The oil grooves 12 for the oil passage at the edge of the sliding disk 8 are in terms of lubricant supply and cooling of the highly stressed inner race surface of the sliding disk 8 optimally, but may have an increased surface pressure result. However, this is associated with no disadvantage, since the enriched with nitrogen and carbon surface layer prevents overuse of the sliding disk 8. The inventive thermo-chemical treatment of the sliding disk 8 thus the advantages of the axial oil grooves 12 come fully into play.
Bezugszeichenreference numeral
1 Klemmkörper-Freilaufkupplung1 sprag overrunning clutch
2 Klemm körper2 clamping body
3 Käfig3 cage
4 Aussparung4 recess
5 Federband5 spring band
6 Federzunge6 spring tongue
7 Bord7 board
8 Gleitscheibe8 sliding disk
9 Radialer Abschnitt9 Radial section
10 Axialer Abschnitt10 Axial section
11 Axialer Abschnitt11 Axial section
12 Ölrillen12 oil grooves
13 Innenfläche13 inner surface
14 Außenfläche14 outer surface
15 Innenfläche15 inner surface
16 Außenfläche 16 outer surface

Claims

Patentansprüche claims
1. Gleitscheibe (8) aus Stahlblech zur Anordnung zwischen einem Innenring und einem Außenring einer Klemmkörper-Freilaufkupplung (1 ), mit einem radial verlaufenden Abschnitt (9) sowie an dessen inneren Rand und äußeren Rand anschließenden axialen Abschnitten (10, 11 ) mit jeweils einer Innenfläche (13, 15) und einer Außenfläche (14, 16), dadurch gekennzeichnet, dass wenigstens die Außenflächen (14, 16) eine durch Nitrocarbuheren erzeugte, mit Stickstoff und Kohlenstoff ange- reicherte, verschleiß- und korrosionsfeste Randschicht aufweisen.1. Sliding disc (8) made of sheet steel for the arrangement between an inner ring and an outer ring of a sprag clutch (1), with a radially extending portion (9) and at its inner edge and outer edge adjoining axial sections (10, 11), respectively an inner surface (13, 15) and an outer surface (14, 16), characterized in that at least the outer surfaces (14, 16) have a generated by Nitrocarbuheren, enriched with nitrogen and carbon, wear and corrosion resistant edge layer.
2. Gleitscheibe nach Anspruch 1 , dadurch gekennzeichnet, dass die aus einer Verbindungsschicht und einer Diffusionsschicht bestehende Randschicht eine Dicke von ca. 10 μm aufweist.2. sliding washer according to claim 1, characterized in that the consisting of a connecting layer and a diffusion layer layer has a thickness of about 10 microns.
3. Gleitscheibe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Randschicht eine Härte von mindestens 400 HV aufweist.3. sliding washer according to claim 1 or 2, characterized in that the edge layer has a hardness of at least 400 HV.
4. Gleitscheibe nach einem der Ansprüche 1 bis 3, dadurch gekenn- zeichnet, dass die Randschicht einen Massenanteil von ca. 1 % Kohlenstoff und 10 bis 15 % Stickstoff enthält.4. sliding washer according to one of claims 1 to 3, characterized in that the surface layer contains a mass fraction of about 1% carbon and 10 to 15% nitrogen.
5. Gleitscheibe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Außenfläche (14) des sich am inneren Rand des ra- dialen Abschnitts (9) anschließenden Abschnitts (10) beabstandete, axial verlaufende Ölrillen (12) aufweist.5. Sliding disc according to one of claims 1 to 4, characterized in that the outer surface (14) of the at the inner edge of the radial section (9) adjoining section (10) spaced, axially extending oil grooves (12).
6. Gleitscheibe nach Anspruch 5, dadurch gekennzeichnet, dass sich die Anzahl der Ölrillen (12) daraus ergibt, dass in der Mindestlastzone we- nigstens drei Ölrillen (12) vorhanden sind.6. sliding washer according to claim 5, characterized in that the number of oil grooves (12) results from the fact that in the minimum load zone, at least three oil grooves (12) are present.
7. Gleitscheibe nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Außenfläche (14) neun Ölrillen (12) aufweist. 7. sliding washer according to claim 5 or 6, characterized in that the outer surface (14) has nine oil grooves (12).
8. Gleitscheibe nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die Breite der Ölrillen (12) ca. 3 mm und deren Tiefe ca. 0,6 mm beträgt.8. sliding washer according to one of claims 5 to 7, characterized in that the width of the oil grooves (12) is about 3 mm and the depth of about 0.6 mm.
9. Gleitscheibe nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, dass die Ölrillen (12) einen kreissegmentförmigen Querschnitt aufweisen.9. sliding washer according to one of claims 5 to 8, characterized in that the oil grooves (12) have a circular segment-shaped cross-section.
10. Verfahren zum Herstellen einer Gleitscheibe nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Gleitscheibe (8) durch Tiefziehen mittels eines Tiefziehwerkzeugs aus einer Stahlblechronde hergestellt und anschließend das Nitrocarburieren durchgeführt wird.10. A method for producing a sliding disk according to one of claims 1 to 9, characterized in that the sliding disk (8) is produced by deep drawing by means of a thermoforming tool from a Stahlblechronde and then the nitrocarburizing is performed.
11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass die Ölrillen (12) beim Tiefziehen durch das Tiefziehwerkzeug in die Außenflächen (14) des sich am inneren Rand des radialen Abschnitts (9) anschließenden axialen Abschnitts (10) eingebracht werden.11. The method according to claim 10, characterized in that the oil grooves (12) during deep drawing by the deep-drawing tool in the outer surfaces (14) of the inner edge of the radial portion (9) adjoining axial portion (10) are introduced.
12. Verfahren nach Anspruch 10 oder 11 , dadurch gekennzeichnet, dass die Gleitscheibe (8) einer Behandlung durch Nitrocarburieren (M6) und durch Carbonitrieren (X6) unterzogen wird.12. The method according to claim 10 or 11, characterized in that the sliding disk (8) is subjected to a treatment by nitrocarburizing (M6) and carbonitriding (X6).
13. Verwendung einer der Stahlsorten DC03, DC04, C16M, 16MnCr5 zur Herstellung einer Gleitscheibe nach einem der Ansprüche 1 bis 12. 13. Use of one of the steel grades DC03, DC04, C16M, 16MnCr5 for producing a sliding disk according to one of claims 1 to 12.
PCT/EP2009/061486 2008-09-18 2009-09-04 Sliding disk in a clamping body overrunning clutch WO2010031702A1 (en)

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