WO2009021938A1 - Freewheeling belt pulley - Google Patents

Freewheeling belt pulley Download PDF

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Publication number
WO2009021938A1
WO2009021938A1 PCT/EP2008/060531 EP2008060531W WO2009021938A1 WO 2009021938 A1 WO2009021938 A1 WO 2009021938A1 EP 2008060531 W EP2008060531 W EP 2008060531W WO 2009021938 A1 WO2009021938 A1 WO 2009021938A1
Authority
WO
WIPO (PCT)
Prior art keywords
freewheeling
ring
outer ring
hub
clamping elements
Prior art date
Application number
PCT/EP2008/060531
Other languages
German (de)
French (fr)
Inventor
Bernhard Wiesneth
Original Assignee
Schaeffler 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 Kg filed Critical Schaeffler Kg
Publication of WO2009021938A1 publication Critical patent/WO2009021938A1/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
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/36—Pulleys
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
    • F16C33/7853—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race
    • F16C33/7856—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race with a single sealing lip
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/001—Integrated brakes or clutches for stopping or coupling the relatively movable parts
    • 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
    • F16D41/064—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls
    • F16D41/066—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical
    • F16D41/067—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical and the members being distributed by a separate cage encircling the axis of rotation
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/28—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with two or more rows of rollers
    • 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
    • F16C33/588—Races of sheet metal
    • 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
    • F16C33/72—Sealings
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • 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
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/08—Details or arrangements of sealings not provided for in group F16D3/84
    • 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
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/36—Pulleys
    • F16H2055/366—Pulleys with means providing resilience or vibration damping

Definitions

  • the invention relates to a suitable for use in an accessory drive of an internal combustion engine freewheeling pulley according to the preamble of claim 1.
  • a generic freewheeling pulley is known for example from DE 195 11 188 C2. Such a freewheeling pulley contributes to the damping of torsional vibrations in a reciprocating internal combustion engine and an accessory connecting traction drive.
  • an overrunning clutch is arranged between a drivable by the internal combustion engine drive pulley and an input shaft of the auxiliary unit or between the crankshaft and a driven pulley of the internal combustion engine.
  • the one-way clutch only engages when the angular velocity of the shaft driving the auxiliary unit increases.
  • the shaft of the accessory has the ability to overtake her directly or indirectly driven by the internal combustion engine drive element when the angular velocity of the crankshaft of the internal combustion engine decreases.
  • the invention has for its object to improve a suitable for an accessory drive of an internal combustion engine Freilaufhemenfound over the prior art, especially in terms of space requirements, on.
  • a freewheeling pulley with the features of claim 1.
  • Essential functional element of this freewheeling pulley is a freewheel unit, which is arranged radially between a hub and a drive pulley, wherein the hub rotatably connected to an input shaft of an auxiliary unit of an internal combustion engine, while the Drive pulley can be driven by the internal combustion engine.
  • the front side of the hub on which the auxiliary unit is arranged is referred to as the first end side.
  • the second end face of the hub can be covered by a cover connected to the drive disk.
  • an annular space is formed in which clamping elements, in particular clamping rollers, are arranged.
  • the outer ring has at least on the first end face on a circumferential board. Axial next to this board is located on the side facing the clamping elements, that is, on the inside of the board, a sealing ring.
  • the sealing ring is in an axially directly to the board bar adjacent, held in the outer ring groove.
  • the sealing ring can be fixed by crimping on the outer ring.
  • An annular, metallic core of the sealing ring may rest on the board or be slightly spaced therefrom.
  • a to the inner ring extending sealing lip of the sealing ring preferably engages in the axial space of the Bordes. In other words, there is at least one radial line that cuts both the board and the sealing lip.
  • the terms "axial” and "radial” are always related to the axis of rotation of the freewheeling pulley.
  • the freewheel unit is preferably designed as a clamping roller freewheel with integrated storage, wherein a row of rolling elements, in particular needles or rollers, is arranged on both sides of the clamping rollers.
  • the outer ring and the inner ring of the freewheel unit can be produced efficiently by chipless forming.
  • FIG. 1 is a sectional view of a freewheeling pulley with a clamping roller freewheel as a freewheel unit
  • FIG. 2 shows the freewheel unit of the device according to FIG. 1,
  • FIG. 3 is a view analogous to FIG. 1 of a comparison between the freewheeling disk according to the invention and an unclaimed freewheeling belt pulley, and FIG
  • FIG. 4 shows a detail of the freewheel unit according to FIG. 2. Detailed description of the drawing
  • FIG. 1 shows a sectional view of a freewheeling belt pulley 1 suitable for an auxiliary drive of an internal combustion engine.
  • a freewheeling pulley With regard to the principal function of a freewheeling pulley, reference is made to the prior art cited at the beginning.
  • the freewheeling pulley 1 comprises, as a functional core piece, a freewheeling unit 2 with an inner ring 3 and an outer ring 4, which are produced as sheet metal parts formed without cutting.
  • the inner ring 3 is pressed onto a hub 5, while the outer ring 4 rotatably connected to a drive pulley 6, namely a pulley, is connected.
  • a series of clamping elements 8 namely pinch rollers, as well as these on both sides adjacent each row of rolling elements 9, namely rollers arranged.
  • the freewheel unit 2 thus forms a clamping roller freewheel with integrated storage.
  • clamping ramps are formed, which cooperate with the pinch rollers 8.
  • the hub 5 has an internal thread 10, in which an input shaft, not shown, of an over the drive pulley 6 and the freewheel unit 2 drivable auxiliary unit can be screwed.
  • the auxiliary unit in particular a generator, is located on the right side of the freewheeling pulley 1 in FIG. 1.
  • the end face of the hub 5 facing the auxiliary unit is referred to as the first end side 11 or the generator side end face.
  • the opposite, second end face 12 of the hub 5 is also referred to as the front end side. This end face 12 is preceded by a dot-dash line indicated cover 13, which with a Edge 14 is fixed to the drive pulley 6.
  • the inner ring 3 has a single, arranged on the second front side 12, radially outwardly directed, a thrust washer 15 adjacent board 16, while the outer ring 4 on each end face 11, 12 a radially inwardly directed board 17, 18 has.
  • the latter board 18 engages around a sealing ring 19, which is located within the annular space 7.
  • the sealing ring 19 is, as also apparent from Figure 2, arranged axially between the board 18 and a rolling bearing cage 20.
  • annular, metal-made core 22 is spaced parallel from the board 18, wherein the axial distance between the board 18 and the core 22 is less than the wall thickness of the board 18 and less than the wall thickness of the core 22 also measured in the axial direction.
  • the outer diameter of the core 22 corresponds at least approximately to the inner diameter of the outer ring 4.
  • the core 22 is surrounded by an elastomer, for example NBR.
  • a sealing lip 23 is formed, which extends from the radially inner edge of the core 22 to the inner ring 3 and forms a sliding seal.
  • the sealing lip engages in a gap 24, which is bounded radially on the one hand by the inner ring 3 and on the other hand by the board 18. At the same time, the sealing lip extends axially into the space in which the board 18 is located.
  • the radially outer edge of the sealing ring 19 engages in a groove 25 which is formed at the transition between a cylindrical, the drive pulley 6 contacting wall portion 26 of the outer ring 4 and the board 18.
  • the groove 25 is as well as the board 18 made by non-cutting deformation of the material used for the production of the outer ring 4.
  • the board 18 is therefore also called Bördelbord.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)

Abstract

The freewheeling belt pulley, with a freewheeling unit (2) which has an inner ring (3) connected to a hub (5), an outer ring (4) connected to a driving pulley (6) which can be driven by an internal combustion engine, and clamping elements (8) arranged between the inner ring (3) and the outer ring (4), wherein the hub (5) is provided for connection to an input shaft of a secondary unit of the internal combustion engine, which unit is arranged on a first end side (11) of the hub (5), while the second end side (12) of the hub (5) can be closed by a cover (13), and wherein a sealing ring (19) which is axially adjacent to a rim (18) of the outer ring (4) is provided for sealing on the first end side (11), and wherein the sealing ring (19) is arranged on that side of the rim (18) which faces the clamping elements (8).

Description

Bezeichnung der Erfindung Name of the invention
FreilaufriemenscheibeOverrunning alternator pulley
Beschreibungdescription
Gebiet der ErfindungField of the invention
Die Erfindung betrifft eine zur Verwendung in einem Nebenaggregateantrieb einer Brennkraftmaschine geeignete Freilaufriemenscheibe nach dem Oberbegriff des Anspruchs 1.The invention relates to a suitable for use in an accessory drive of an internal combustion engine freewheeling pulley according to the preamble of claim 1.
Hintergrund der ErfindungBackground of the invention
Eine gattungsgemäße Freilaufriemenscheibe ist beispielsweise aus der DE 195 11 188 C2 bekannt. Eine derartige Freilaufriemenscheibe trägt zur Dämpfung von Drehschwingungen in einem eine Hubkolbenbrennkraftmaschine und ein Nebenaggregat verbindenden Zugmitteltrieb bei. Hierbei ist eine Freilaufkupplung zwischen einer von der Brennkraftmaschine antreibbaren Antriebsscheibe und einer Eingangswelle des Nebenaggregats oder zwischen der Kurbelwelle und einer Abtriebsscheibe der Brennkraftmaschine angeordnet. Die Freilaufkupplung kuppelt nur dann ein, wenn die Winkelgeschwindigkeit der das Ne- benaggregat antreibenden Welle zunimmt. Dagegen hat die Welle des Nebenaggregats die Möglichkeit, ihr direkt oder indirekt von der Brennkraftmaschine angetriebenes Antriebselement zu überholen, wenn die Winkelgeschwindigkeit der Kurbelwelle der Brennkraftmaschine abnimmt. Somit werden insbesondere bei niedrigen Drehzahlen auftretende Drehzahlschwankungen der Brennkraft- maschine nicht in vollem Umfang an das Nebenaggregat, beispielsweise einen Generator, weitergegeben. Dies trägt wesentlich zur Reduzierung mechanischer Belastungen im Zugmitteltrieb bei. Insgesamt handelt es sich bei der Vorrichtung nach der DE 195 11 188 C2 um eine bewährte Konstruktion. Aufgabe der ErfindungA generic freewheeling pulley is known for example from DE 195 11 188 C2. Such a freewheeling pulley contributes to the damping of torsional vibrations in a reciprocating internal combustion engine and an accessory connecting traction drive. Here, an overrunning clutch is arranged between a drivable by the internal combustion engine drive pulley and an input shaft of the auxiliary unit or between the crankshaft and a driven pulley of the internal combustion engine. The one-way clutch only engages when the angular velocity of the shaft driving the auxiliary unit increases. In contrast, the shaft of the accessory has the ability to overtake her directly or indirectly driven by the internal combustion engine drive element when the angular velocity of the crankshaft of the internal combustion engine decreases. Thus, in particular occurring at low speeds speed fluctuations of the internal combustion engine are not fully passed to the accessory, such as a generator. This contributes significantly to the reduction of mechanical loads in the traction drive. Overall, the device according to DE 195 11 188 C2 is a proven construction. Object of the invention
Der Erfindung liegt die Aufgabe zugrunde, eine für einen Nebenaggregateantrieb einer Brennkraftmaschine geeignete Freilaufhemenscheibe gegenüber dem Stand der Technik, insbesondere hinsichtlich des Bauraumbedarfs, weiter zu verbessern.The invention has for its object to improve a suitable for an accessory drive of an internal combustion engine Freilaufhemenscheibe over the prior art, especially in terms of space requirements, on.
Zusammenfassung der ErfindungSummary of the invention
Diese Aufgabe wird erfindungsgemäß gelöst durch eine Freilaufriemenscheibe mit den Merkmalen des Anspruchs 1. Wesentliches Funktionselement dieser Freilaufriemenscheibe ist eine Freilaufeinheit, welche radial zwischen einer Nabe und einer Antriebsscheibe angeordnet ist, wobei die Nabe drehfest mit einer Eingangswelle eines Nebenaggregats einer Brennkraftmaschine verbindbar ist, während die Antriebsscheibe von der Brennkraftmaschine antreibbar ist. Diejenige Stirnseite der Nabe, auf weicher das Nebenaggregat angeordnet ist, wird als erste Stirnseite bezeichnet. Im Gegensatz zu dieser Stirnseite ist die zweite Stirnseite der Nabe mit einem mit der Antriebsscheibe verbundenen Deckel abdeckbar. Zwischen einem Innenring und einem Außenring der Freilaufeinheit ist ein Ringraum gebildet, in welchem Klemmelemente, insbesondere Klemmrollen, angeordnet sind. Der Außenring weist zumindest auf der ers- ten Stirnseite einen umlaufenden Bord auf. Axial neben diesem Bord befindet sich auf dessen den Klemmelementen zugewandter Seite, das heißt auf der Innenseite des Bordes, ein Dichtring. Überraschenderweise hat sich gezeigt, dass damit der Bauraumbedarf der Freilaufriemenscheibe in axialer Richtung im Vergleich zu einer herkömmlichen Freilaufriemenscheibe, welche eine au- ßerhalb des Bordes des Außenrings auf der ersten Stirnseite angeordnete Dichtung aufweist, signifikant reduziert ist.This object is achieved by a freewheeling pulley with the features of claim 1. Essential functional element of this freewheeling pulley is a freewheel unit, which is arranged radially between a hub and a drive pulley, wherein the hub rotatably connected to an input shaft of an auxiliary unit of an internal combustion engine, while the Drive pulley can be driven by the internal combustion engine. The front side of the hub on which the auxiliary unit is arranged is referred to as the first end side. In contrast to this end face, the second end face of the hub can be covered by a cover connected to the drive disk. Between an inner ring and an outer ring of the freewheeling unit, an annular space is formed in which clamping elements, in particular clamping rollers, are arranged. The outer ring has at least on the first end face on a circumferential board. Axial next to this board is located on the side facing the clamping elements, that is, on the inside of the board, a sealing ring. Surprisingly, it has been found that the space requirement of the freewheeling belt pulley in the axial direction is significantly reduced in comparison to a conventional freewheeling pulley, which has a seal arranged outside the rim of the outer ring on the first end face.
In bevorzugter Ausgestaltung ist der Dichtring in einer dem Bord axial unmittel- bar benachbarten, im Außenring gebildeten Nut gehalten. Auf einfache Weise ist der Dichtring durch Bördeln am Außenring fixierbar. Ein ringförmiger, metallischer Kern des Dichtrings kann am Bord anliegen oder von diesem geringfügig beabstandet sein. Eine sich zum Innenring erstreckende Dichtlippe des Dichtrings greift vorzugsweise in den axialen Bauraum des Bordes ein. Mit anderen Worten: Es existiert mindestens eine Radiallinie, welche sowohl den Bord als auch die Dichtlippe schneidet. Die Begriffe „axial" und „radial" sind stets auf die Rotationsachse der Freilaufriemenscheibe bezogen.In a preferred embodiment, the sealing ring is in an axially directly to the board bar adjacent, held in the outer ring groove. In a simple way, the sealing ring can be fixed by crimping on the outer ring. An annular, metallic core of the sealing ring may rest on the board or be slightly spaced therefrom. A to the inner ring extending sealing lip of the sealing ring preferably engages in the axial space of the Bordes. In other words, there is at least one radial line that cuts both the board and the sealing lip. The terms "axial" and "radial" are always related to the axis of rotation of the freewheeling pulley.
Die Freilaufeinheit ist vorzugsweise als Klemmrollenfreilauf mit integrierter Lagerung gestaltet, wobei zu beiden Seiten der Klemmrollen jeweils eine Reihe Wälzkörper, insbesondere Nadeln oder Rollen, angeordnet ist. Der Außenring sowie der Innenring der Freilaufeinheit sind rationell durch spanlose Umformung herstellbar.The freewheel unit is preferably designed as a clamping roller freewheel with integrated storage, wherein a row of rolling elements, in particular needles or rollers, is arranged on both sides of the clamping rollers. The outer ring and the inner ring of the freewheel unit can be produced efficiently by chipless forming.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand einer Zeichnung näher erläutert. Hierin zeigen:An embodiment of the invention will be explained in more detail with reference to a drawing. Herein show:
Kurze Beschreibung der ZeichnungShort description of the drawing
Figur 1 in einer Schnittdarstellung eine Freilaufriemenscheibe mit einem Klemmrollenfreilauf als Freilaufeinheit,1 is a sectional view of a freewheeling pulley with a clamping roller freewheel as a freewheel unit,
Figur 2 die Freilaufeinheit der Vorrichtung nach Figur 1 ,FIG. 2 shows the freewheel unit of the device according to FIG. 1,
Figur 3 in einer Ansicht analog Figur 1 eine Gegenüberstellung zwischen der erfindungsgemäßen Freilaufrie- menscheibe und einer nicht beanspruchten Freilaufriemenscheibe, undFIG. 3 is a view analogous to FIG. 1 of a comparison between the freewheeling disk according to the invention and an unclaimed freewheeling belt pulley, and FIG
Figur 4 ein Detail der Freilaufeinheit nach Figur 2. Ausführliche Beschreibung der ZeichnungFIG. 4 shows a detail of the freewheel unit according to FIG. 2. Detailed description of the drawing
Einander entsprechende oder gleichwirkende Teile sind in allen Figuren mit den gleichen Bezugszeichen gekennzeichnet.Corresponding or equivalent parts are identified in all figures with the same reference numerals.
Die Figur 1 zeigt in einer Schnittdarstellung eine für einen Nebenaggregateantrieb einer Brennkraftmaschine geeignete Freilaufriemenscheibe 1. Hin- sichtlich der prinzipiellen Funktion einer Freilaufriemenscheibe wird auf den eingangs zitierten Stand der Technik verwiesen.FIG. 1 shows a sectional view of a freewheeling belt pulley 1 suitable for an auxiliary drive of an internal combustion engine. With regard to the principal function of a freewheeling pulley, reference is made to the prior art cited at the beginning.
Die Freilaufriemenscheibe 1 umfasst als funktionelles Kernstück eine Freilaufeinheit 2 mit einem Innenring 3 und einem Außenring 4, welche als spanlos umgeformte Blechteile hergestellt sind. Der Innenring 3 ist auf eine Nabe 5 aufgepresst, während der Außenring 4 drehfest mit einer Antriebsscheibe 6, nämlich einer Riemenscheibe, verbunden ist. Im zwischen dem Innenring 3 und dem Außenring 4 gebildeten Ringraum 7 sind eine Reihe Klemmelemente 8, nämlich Klemmrollen, sowie diesen beidseitig benachbart jeweils eine Reihe Wälzkörper 9, nämlich Rollen, angeordnet. Die Freilaufeinheit 2 bildet somit einen Klemmrollenfreilauf mit integrierter Lagerung. In die Außenoberfläche des Innenrings 3 sind in den Figuren nicht sichtbare Klemmrampen eingeformt, die mit den Klemmrollen 8 zusammenwirken.The freewheeling pulley 1 comprises, as a functional core piece, a freewheeling unit 2 with an inner ring 3 and an outer ring 4, which are produced as sheet metal parts formed without cutting. The inner ring 3 is pressed onto a hub 5, while the outer ring 4 rotatably connected to a drive pulley 6, namely a pulley, is connected. In between the inner ring 3 and the outer ring 4 formed annular space 7 are a series of clamping elements 8, namely pinch rollers, as well as these on both sides adjacent each row of rolling elements 9, namely rollers arranged. The freewheel unit 2 thus forms a clamping roller freewheel with integrated storage. In the outer surface of the inner ring 3 not visible in the figures clamping ramps are formed, which cooperate with the pinch rollers 8.
Die Nabe 5 weist ein Innengewinde 10 auf, in welches eine nicht dargestellte Eingangswelle eines über die Antriebsscheibe 6 und die Freilaufeinheit 2 antreibbaren Nebenaggregats einschraubbar ist. Im komplett montierten Zustand befindet sich das Nebenaggregat, insbesondere ein Generator, auf der in der Figur 1 rechten Seite der Freilaufriemenscheibe 1. Die dem Nebenaggregat zugewandete Stirnseite der Nabe 5 wird als erste Stirnseite 11 oder generator- seitige Stirnseite bezeichnet. Die gegenüber liegende, zweite Stirnseite 12 der Nabe 5 wird auch als frontseitige Stirnseite bezeichnet. Dieser Stirnseite 12 vorgelagert ist ein strichpunktiert angedeuteter Deckel 13, welcher mit einem Rand 14 an der Antriebsscheibe 6 befestigt ist.The hub 5 has an internal thread 10, in which an input shaft, not shown, of an over the drive pulley 6 and the freewheel unit 2 drivable auxiliary unit can be screwed. In the fully assembled state, the auxiliary unit, in particular a generator, is located on the right side of the freewheeling pulley 1 in FIG. 1. The end face of the hub 5 facing the auxiliary unit is referred to as the first end side 11 or the generator side end face. The opposite, second end face 12 of the hub 5 is also referred to as the front end side. This end face 12 is preceded by a dot-dash line indicated cover 13, which with a Edge 14 is fixed to the drive pulley 6.
Der Innenring 3 weist einen einzigen, auf der zweiten Frontseite 12 angeordneten, radial nach außen gerichteten, einer Anlaufscheibe 15 benachbarten Bord 16 auf, während der Außenring 4 auf jeder Stirnseite 11 , 12 einen radial nach innen gerichteten Bord 17, 18 aufweist. Der letztgenannte Bord 18 umgreift einen Dichtring 19, welcher sich innerhalb des Ringraums 7 befindet. Der Dichtring 19 ist, wie auch aus Figur 2 hervorgeht, axial zwischen dem Bord 18 und einem Wälzlagerkäfig 20 angeordnet.The inner ring 3 has a single, arranged on the second front side 12, radially outwardly directed, a thrust washer 15 adjacent board 16, while the outer ring 4 on each end face 11, 12 a radially inwardly directed board 17, 18 has. The latter board 18 engages around a sealing ring 19, which is located within the annular space 7. The sealing ring 19 is, as also apparent from Figure 2, arranged axially between the board 18 and a rolling bearing cage 20.
In Figur 2 ist in der unteren Hälfte der Darstellung die erfindungsgemäße Freilaufriemenscheibe 1 sichtbar, während in der oberen Hälfte zum Vergleich eine nicht beanspruchte Ausführungsform einer Freilaufriemenscheibe dargestellt ist. Die letztgenannte Ausführungsform unterscheidet sich von der erfindungs- gemäßen Ausführungsform hauptsächlich dadurch, dass eine Dichtung 21 außerhalb des Ringraums 7 angeordnet ist. Wie aus Figur 3 hervorgeht, wird hierdurch im Vergleich zur erfindungsgemäßen Freilaufriemenscheibe 1 mit innenliegendem Dichtring 19 erheblich mehr axialer Bauraum benötigt.In Figure 2, the freewheeling pulley 1 according to the invention is visible in the lower half of the illustration, while in the upper half for comparison, an unclaimed embodiment of a freewheeling pulley is shown. The last-mentioned embodiment differs from the embodiment according to the invention mainly in that a seal 21 is arranged outside the annular space 7. As can be seen from FIG. 3, in comparison to the freewheeling belt pulley 1 according to the invention with an inner sealing ring 19, this means that considerably more axial space is required.
Aus Figur 4 geht die Ausbildung des Dichtrings 19 im Detail hervor. Ein ringförmiger, aus Metall gefertigter Kern 22 ist von dem Bord 18 parallel beabstandet, wobei der axiale Abstand zwischen dem Bord 18 und dem Kern 22 geringer als die Wandstärke des Bordes 18 sowie geringer als die ebenfalls in axialer Richtung gemessene Wandstärke des Kerns 22 ist. Der Außendurchmesser des Kerns 22 entspricht zumindest näherungsweise dem Innendurchmesser des Außenrings 4. An der radial äußeren, an der radial inneren, sowie an der dem Bord 18 zugewandten Seite ist der Kern 22 von einem Elastomer, beispielsweise NBR, umgeben. Aus demselben Material ist eine Dichtlippe 23 gebildet, welche sich ausgehend vom radial inneren Rand des Kerns 22 zum Innenring 3 erstreckt und eine schleifende Dichtung bildet. Die Dichtlippe greift in einen Spaltraum 24 ein, der radial einerseits durch den Innenring 3 und andererseits durch den Bord 18 begrenzt ist. Gleichzeitig erstreckt sich die Dichtlippe axial bis in den Bauraum, in welchem sich der Bord 18 befindet. Der radial äußere Rand des Dichtrings 19 greift in eine Nut 25 ein, welche am Übergang zwischen einem zylindrischen, die Antriebsscheibe 6 kontaktierenden Wandungsbereich 26 des Außenrings 4 und dem Bord 18 gebildet ist. Die Nut 25 ist ebenso wie der Bord 18 durch spanlose Umformung des zur Fertigung des Außenrings 4 verwendeten Materials hergestellt. Der Bord 18 wird daher auch als Bördelbord bezeichnet. Durch den Bördelvorgang ist der Dichtring 19 dauerhaft im Außenring 4 befestigt. From Figure 4, the formation of the sealing ring 19 is shown in detail. An annular, metal-made core 22 is spaced parallel from the board 18, wherein the axial distance between the board 18 and the core 22 is less than the wall thickness of the board 18 and less than the wall thickness of the core 22 also measured in the axial direction. The outer diameter of the core 22 corresponds at least approximately to the inner diameter of the outer ring 4. At the radially outer, on the radially inner, and on the side facing the board 18, the core 22 is surrounded by an elastomer, for example NBR. From the same material, a sealing lip 23 is formed, which extends from the radially inner edge of the core 22 to the inner ring 3 and forms a sliding seal. The sealing lip engages in a gap 24, which is bounded radially on the one hand by the inner ring 3 and on the other hand by the board 18. At the same time, the sealing lip extends axially into the space in which the board 18 is located. The radially outer edge of the sealing ring 19 engages in a groove 25 which is formed at the transition between a cylindrical, the drive pulley 6 contacting wall portion 26 of the outer ring 4 and the board 18. The groove 25 is as well as the board 18 made by non-cutting deformation of the material used for the production of the outer ring 4. The board 18 is therefore also called Bördelbord. By crimping the sealing ring 19 is permanently attached in the outer ring 4.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Freilaufriemenscheibe1 freewheel pulley
2 Freilaufeinheit2 freewheel unit
3 lnnenring3 inner ring
4 Außenring4 outer ring
5 Nabe5 hub
6 Antriebsscheibe6 drive pulley
7 Ringraum7 annulus
8 Klemmelement8 clamping element
9 Wälzkörper9 rolling elements
10 Innengewinde10 internal thread
11 erste Stirnseite11 first end face
12 zweite Stirnseite12 second end face
13 Deckel13 lids
14 Rand14 edge
15 Anlaufscheibe15 thrust washer
16 Bord des Innenrings16 board of the inner ring
17 Bord des Außenrings17 board of the outer ring
18 Bord des Außenrings18 board of the outer ring
19 Dichtring19 sealing ring
20 Wälzlagerkäfig20 rolling bearing cage
21 Dichtung21 seal
22 Kern22 core
23 Dichtlippe23 sealing lip
24 Spaltraum24 gap space
25 Nut25 groove
26 Wandungsbereich 26 wall area

Claims

Patentansprüche claims
1. Freilaufriemenscheibe, mit einer Freilaufeinheit (2), welche einen mit einer Nabe (5) verbundenen Innenring (3), einen mit einer von einer Brennkraftmaschine antreibbaren Antriebsscheibe (6) verbundenen Außenring (4), sowie zwischen dem Innenring (3) und dem Außenring (4) angeordnete Klemmelemente (8) aufweist, wobei die Nabe (5) zur Verbindung mit einer Eingangswelle eines an einer ersten Stirnseite (1 1 ) der Nabe (5) angeordneten Nebenaggregats der1. freewheeling pulley, with a freewheel unit (2) having a hub (5) connected to the inner ring (3), one with a drivable by an internal combustion engine drive pulley (6) outer ring (4), and between the inner ring (3) and the outer ring (4) arranged clamping elements (8), wherein the hub (5) for connection to an input shaft of a at a first end face (1 1) of the hub (5) arranged auxiliary unit of
Brennkraftmaschine vorgesehen ist, während die zweite Stirnseite (12) der Nabe (5) mit einem Deckel (13) verschließbar ist, und wobei zur Abdichtung auf der ersten Stirnseite (1 1 ) ein einem Bord (18) des Außenrings (4) axial benachbarter Dichtring (19) vorgesehen ist, dadurch gekennzeichnet, dass der Dicht- ring (19) auf der den Klemmelementen (8) zugewandten Seite des Bordes (18) angeordnet ist.Internal combustion engine is provided, while the second end face (12) of the hub (5) with a cover (13) is closable, and wherein for sealing on the first end face (1 1) a board (18) of the outer ring (4) axially adjacent Sealing ring (19) is provided, characterized in that the sealing ring (19) on the clamping elements (8) facing side of the board (18) is arranged.
2. Freilaufriemenscheibe nach Anspruch 1 , dadurch gekennzeichnet, dass der Dichtring (19) in einer dem Bord (18) axial benachbarten, im Außenring (4) ge- bildeten Nut (25) gehalten ist.2. freewheeling belt pulley according to claim 1, characterized in that the sealing ring (19) is held in a the flange (18) axially adjacent, in the outer ring (4) formed groove (25).
3. Freilaufriemenscheibe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Dichtring (19) eine in den axialen Bauraum des Bordes (18) eingreifende Dichtlippe (23) aufweist.3. freewheeling pulley according to claim 1 or 2, characterized in that the sealing ring (19) has a in the axial space of the Bordes (18) engaging the sealing lip (23).
4. Freilaufriemenscheibe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Dichtring (19) einen metallischen Kern (22) aufweist.4. freewheeling pulley according to one of claims 1 to 3, characterized in that the sealing ring (19) has a metallic core (22).
5. Freilaufriemenscheibe nach einem der Ansprüche 1 bis 4, dadurch gekenn- zeichnet, dass als Klemmelemente (8) Klemmrollen vorgesehen sind.5. freewheeling pulley according to one of claims 1 to 4, characterized in that clamping elements are provided as clamping elements (8).
6. Freilaufriemenscheibe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass in dem zwischen dem Innenring (3) und dem Außenring (4) gebildeten Ringraum (7) sowohl Klemmelemente (8) als auch Wälzkörper (9) an- geordnet sind.6. freewheeling pulley according to one of claims 1 to 5, characterized in that in the between the inner ring (3) and the outer ring (4) formed annular space (7) both clamping elements (8) and rolling elements (9) are arranged.
7. Freilaufriemenscheibe nach Anspruch 6, dadurch gekennzeichnet, dass beidseitig einer Reihe von Klemmelementen (8) jeweils eine Reihe von Wälzkörpern (9) angeordnet ist. Freilaufriemenscheibe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass mindestens eines der Teile Innenring (3) und Außenring (4) als spanlos umgeformtes Blechteil ausgebildet ist. 7. freewheeling pulley according to claim 6, characterized in that on both sides of a number of clamping elements (8) each have a series of rolling elements (9) is arranged. Freewheel pulley according to one of claims 1 to 7, characterized in that at least one of the parts inner ring (3) and outer ring (4) is formed as a chipless formed sheet metal part.
PCT/EP2008/060531 2007-08-14 2008-08-11 Freewheeling belt pulley WO2009021938A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202007011358U DE202007011358U1 (en) 2007-08-14 2007-08-14 Overrunning alternator pulley
DE202007011358.7 2007-08-14

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WO2009021938A1 true WO2009021938A1 (en) 2009-02-19

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WO (1) WO2009021938A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220228656A1 (en) * 2021-01-15 2022-07-21 Jtekt Corporation Toothed pulley

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19511188A1 (en) * 1994-10-22 1996-04-25 Schaeffler Waelzlager Kg Driving torque absorber with freewheel coupling for piston engine
JP2000291782A (en) * 1999-04-07 2000-10-20 Nsk Ltd Pulley device with built-in one-way clutch for alternator
EP1067303A2 (en) * 1999-07-09 2001-01-10 Nsk Ltd Alternator pulley unit with a built-in one-way clutch
US20010006138A1 (en) * 1999-12-28 2001-07-05 Shuichi Nagaya One-way clutch
US20020183147A1 (en) * 1999-11-19 2002-12-05 Koyo Seiko Co., Ltd. Pulley unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19511188A1 (en) * 1994-10-22 1996-04-25 Schaeffler Waelzlager Kg Driving torque absorber with freewheel coupling for piston engine
JP2000291782A (en) * 1999-04-07 2000-10-20 Nsk Ltd Pulley device with built-in one-way clutch for alternator
EP1067303A2 (en) * 1999-07-09 2001-01-10 Nsk Ltd Alternator pulley unit with a built-in one-way clutch
US20020183147A1 (en) * 1999-11-19 2002-12-05 Koyo Seiko Co., Ltd. Pulley unit
US20010006138A1 (en) * 1999-12-28 2001-07-05 Shuichi Nagaya One-way clutch

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