EP1462630B1 - Belt drive - Google Patents

Belt drive Download PDF

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Publication number
EP1462630B1
EP1462630B1 EP20040004793 EP04004793A EP1462630B1 EP 1462630 B1 EP1462630 B1 EP 1462630B1 EP 20040004793 EP20040004793 EP 20040004793 EP 04004793 A EP04004793 A EP 04004793A EP 1462630 B1 EP1462630 B1 EP 1462630B1
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EP
European Patent Office
Prior art keywords
flexible drive
freewheeling
drive according
pressure pump
unit
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP20040004793
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German (de)
French (fr)
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EP1462630A1 (en
Inventor
Thomas Bertelshofer
Tino HÄNSEL
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IHO Holding GmbH and Co KG
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Schaeffler KG
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Publication of EP1462630A1 publication Critical patent/EP1462630A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/06Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members

Definitions

  • the present invention relates to a traction mechanism drive, which is provided for driving at least one unit of an internal combustion engine.
  • the traction mechanism includes a traction means that connects pulleys of the output member and at least one Antnebsorgans
  • Two radially spaced machine parts of the drive member form an annular mounting space, which is intended for a freewheel unit, which includes a Freilaufkuppklung and at least one rolling bearing
  • the overrunning clutch has the task in case of fluctuations an angular velocity to drive the drive member only at an accelerated angular velocity
  • a one-way clutch is known, which is integrated in a drain disk of the belt-driven generator.
  • the overrunning clutch is constructed and inserted into the running disk such that, on the one hand, in an acceleration phase of the traction mechanism drive, the rotational movement introduced by the crankshaft, the drive member, into the traction means is transmitted directly to the generator by the coupled overrunning clutch.
  • the overrunning clutch decoupled as soon as the self-delay of the generator is smaller than the delay of the running disk, which is in communication with the output member, the crankshaft of the internal combustion engine.
  • the problem of the present task is to further develop a Switzerlandstoffantneb according to the features of the preamble of claim 1 such that the freewheel unit compensates for both a strong alternating torque of the driven unit and introduced in the traction drive rotational irregularity of the internal combustion engine.
  • this object is achieved in a traction drive for a high-pressure pump, which is preferably for diesel storage injection systems (common rail) today diesel engines intended to achieve shortened high pressure lines between the high-pressure pump and the high-pressure accumulator of these injection systems, the high pressure pump is driven by the timing drive or the camshaft
  • the provided separately from the control drive traction drive connects the pulleys of the output member preferably, one connected to the camshaft Running disk with the output member, designed as a high-pressure pump associated with the running disk.
  • High-pressure fuel pumps have a non-uniform torque curve, whereby these pumps trigger a disadvantageous vibration excitation of Wegstoffantriebs, coupled with negative repercussions on the timing drive and the timing of the internal combustion engine
  • the drive of a diesel high pressure pump for a diesel storage injection system does not require a precise angular position between the output member and the drive member. Consequently, a freewheel unit can be assigned to the drive member of the traction mechanism drive for a diesel high-pressure pump.
  • critical alternating moments are disconnected from the traction mechanism, connected to a relief of the traction means, which simultaneously adjusts a noise-optimized traction mechanism.
  • the freewheeling unit is associated with an aggregate with a strongly fluctuating drive torque, which due to the design has a non-uniform torque curve due to its design and consequently heavily strains the traction mechanism drive, in particular the traction means, which is associated with this.
  • the high-pressure pump drive provides two connected in series traction drives of, wherein the first, the control drive associated traction drive a direct angular reference between the Antnebsorgan and the output member, the crankshaft and the camshaft requires function.
  • the drive member is associated with the freewheel unit, thereby adjusting a calming of the traction means, to achieve a noise-optimized, life-increasing traction mechanism.
  • the freewheel unit is integrated according to an advantageous embodiment of the invention in the rotor of the diesel high pressure pump and thus in the drive member.
  • the installation space provided for the freewheel unit is bounded radially inwardly by a torsionally rigid inner ring connected to the pump shaft and externally by an outer ring of the running disk.
  • a seal is assigned to the installation space at each end. to fix these torsionally rigid on the outer ring of the running disk, wherein the associated sealing lip is brought in compliance with a defined sealing gap up to the inner ring.
  • a further development according to the invention provides for the freewheel unit within the pump housing. to be arranged, wherein the freewheel unit connects two journals of the high-pressure pump.
  • a first shaft journal advantageously engages in a pot-like receptacle of the second shaft journal, whereby an annular annular gap or installation space for receiving the freewheel unit adjusts.
  • This arrangement forms a protected installation space of the freewheel unit, which requires no sealing.
  • high-pressure pumps for diesel accumulator injection systems provides to provide these pumps with a rotating flywheel, as compensation for the fluctuating drive torque, whereby a calm traction drive can be realized.
  • the invention includes for driving the high-pressure pump, a flat belt or a chain as traction means.
  • a bias of the traction means is required, which is preferably achieved by means of a separate clamping device.
  • a separate clamping device for example, an eccentric tensioning device is suitable, in which a spring-loaded tensioning pulley or running disk is automatically supported on the traction means, preferably in the region of the empty tower.
  • a pivotable high-pressure pump is available, which is supported via a spring element and ensures a required pretensioning force of the traction mechanism.
  • the spring means acted upon the high-pressure pump in a direction of rotation biasing the traction means
  • the pivotally arranged high-pressure pump is connected via an elastic pressure line to the high-pressure accumulator of the diesel accumulator injection system of the internal combustion engine.
  • the traction mechanism drive according to the invention preferably comprises a one-way clutch configured as a sprag freewheel clutch.
  • the invention includes a clamping roller freewheel or a sleeve freewheel Since the invention is not limited to a specific freewheel concept, it is still appropriate to use a freewheel clutch freewheel clutch
  • FIG. 1 shows a traction mechanism drive 1 between a driven member 2 and a Antnebsorgan 3
  • the output member 2 is a torsionally rigid connected to a camshaft of an internal combustion engine running disk 4, wherein the camshaft and thus the Abtnebsorgan 2 a drive from an in FIG. 1
  • a traction means 7 connects the output member 2 with the drive member 3 and thereby at least partially surrounds the running disk 4 and the associated, the drive member 3 associated with running wheel 6.
  • the one Diesel high-pressure pump performing Annebsorgan 3 includes a, the running disk 6 associated freewheeling unit 8a.
  • an eccentric enclosing clamping device 9 is based on the circulating in the clockwise traction mechanism 1 in the empty tower on the traction means 7 from the traction mechanism drive 1 is like FIG. 1 represents downstream of the traction mechanism 5 and avoids adverse transfer of rotationally non-uniformity of the internal combustion engine of the Abtnebsorgan 2 on the drive member 3 due to the present invention in the running disk 6 integnerten freewheeling unit 8a
  • the structure of the drive member 3, in particular the mounting position of the freewheeling unit 8a within the rotor disk 6 illustrates the FIG. 2
  • the running disk 6 comprises a torsionally rigid with a pump shaft 11 a connected inner ring 12 which is radially spaced, with the formation of an annular mounting space 15, surrounded by an outer ring 16.
  • the rolling in a housing 14 of a high-pressure pump pump shaft 11a is connected via a trained as a cone dressing 13 press fit with the running disk 6.
  • the installation space 15 serves to accommodate the freewheeling unit 8a, which includes in the center an overrunning clutch 17a, which is assigned a rolling bearing 18, 19 on both sides.
  • flywheel 10 is axially supported on the inner ring 12 of the rotor disk 6 from.
  • An axial force required for the function of the conical bandage 13 is achieved by means of the guide bush 21, which at the same time performs the function of a nut screwed onto an end-side threaded portion 22 of the pump shaft 11a, exerting an axial force on the cone bandage 13 via a shoulder of the flywheel 10
  • FIG. 3 shows you one FIG. 2 Deviating two-part construction of the pump shaft 11b, which includes two shaft journals 23, 24
  • the shaft journal 23 connected positively and positively to the running disk 6 via the cone union 13 forms a cup-shaped receptacle 25 into which the shaft journal 24 engages in a radially spaced manner 26, which is intended to receive the freewheel unit 8b Deviating from the freewheel unit 8a ge drunk FIG. 2 , closes the freewheel unit 8b according to FIG. 3 only one side of the one-way clutch 17b juxtaposed bearings 27 a.
  • the shaft journal 23 is rotatably supported by the roller bearing 28 in the housing 14 of the high-pressure pump 20

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Rotary Pumps (AREA)

Description

Gebiet der ErfindungField of the invention

Die vorliegende Erfindung bezieht sich auf einen Zugmittelantrieb, der zum Antrieb von zumindest einem Aggregat einer Brennkraftmaschine vorgesehen ist. Dabei umfasst der Zugmitteltrieb ein Zugmittel, dass Laufscheiben des Abtriebsorgans und zumindest eines Antnebsorgans verbindet Zwei radial beabstandede Maschinenteile des Antriebsorgans bilden einen kreisringförmigen Einbauraum, der für eine Freilaufeinheit bestimmt ist, die eine Freilaufkuppklung und zumindest ein Wälzlager einschließt Die Freilaufkupplung hat die Aufgabe, bei Schwankungen einer Winkelgeschwindigkeit das Antriebsorgan nur bei einer beschleunigten Winkelgeschwindigkeit anzutreibenThe present invention relates to a traction mechanism drive, which is provided for driving at least one unit of an internal combustion engine. In this case, the traction mechanism includes a traction means that connects pulleys of the output member and at least one Antnebsorgans Two radially spaced machine parts of the drive member form an annular mounting space, which is intended for a freewheel unit, which includes a Freilaufkuppklung and at least one rolling bearing The overrunning clutch has the task in case of fluctuations an angular velocity to drive the drive member only at an accelerated angular velocity

Hintergrund der ErfindungBackground of the invention

Zugmittelanbtriebe von Brennkraftmaschinen sind der funktionsbedingten Drehungleichförmigkeit der Brennkraftmaschine ausgesetzt Die Drehungleichformigkeit leitet ein Wechselmoment und damit verbunden Schwankungen der Winkelgeschwindigkeit in den Zugmittelantrieb, die bei anzutreibenden Aggregaten mit großen Drehmassen, wie beispielsweise einem Generator, einem Klimakompressor oder Pumpen mit zusätzlichen Schwungmassen insbesondere das Zugmittel des Zugmittelantriebs hoch belasten.Zugmittelanbtriebe of internal combustion engines are exposed to the functional rotational irregularity of the internal combustion engine Rotationsleichformigkeit passes an alternating torque and associated fluctuations in the Angular velocity in the traction drive, which particularly burden the traction means of Zugmittelantriebs in driven units with large rotating masses, such as a generator, an air compressor or pumps with additional flywheel masses.

Als Maßnahme, die Belastung des Zugmittelantriebs zu reduzieren ist aus der DE 195 11 188 A1 eine Freilaufkupplung bekannt, die in einer Ablaufscheibe des riemengetriebenen Generators integriert ist. Die Freilaufkupplung ist so aufgebaut und in die Laufscheibe eingesetzt, dass einerseits in einer Beschleunigungsphase des Zugmittelantriebs die von der Kurbelwelle, dem Antriebsorgan, in das Zugmittel eingeleitete Drehbewegung durch die eingekoppelte Freilaufkupplung unmittelbar auf den Generator übertragen wird. Andererseits entkoppelt die Freilaufkupplung, sobald die Eigenverzögerung des Generators kleiner ist als die Verzögerung der Laufscheibe, die mit Abtriebsorgan, der Kurbelwelle der Brennkraftmaschine in Verbindung steht.As a measure to reduce the load on the traction drive is from the DE 195 11 188 A1 a one-way clutch is known, which is integrated in a drain disk of the belt-driven generator. The overrunning clutch is constructed and inserted into the running disk such that, on the one hand, in an acceleration phase of the traction mechanism drive, the rotational movement introduced by the crankshaft, the drive member, into the traction means is transmitted directly to the generator by the coupled overrunning clutch. On the other hand, the overrunning clutch decoupled as soon as the self-delay of the generator is smaller than the delay of the running disk, which is in communication with the output member, the crankshaft of the internal combustion engine.

Zusammenfassung der ErfindungSummary of the invention

Die Problemstellung der vorliegenden Aufgabe besteht darin, einen Zugmittelantneb nach den Merkmalen des Oberbegriffs von Anspruch 1 derartig weiter zu bilden, dass die Freilaufeinheit sowohl ein starkes Wechselmoment des anzutreibenden Aggregates als auch die im Zugmittelantrieb eingeleitete Drehungleichförmigkeit der Brennkraftmaschine kompensiert.The problem of the present task is to further develop a Zugmittelantneb according to the features of the preamble of claim 1 such that the freewheel unit compensates for both a strong alternating torque of the driven unit and introduced in the traction drive rotational irregularity of the internal combustion engine.

Erfindungsgemäß wird diese Aufgabenstellung in einem Zugmittelantrieb für eine Hochdruckpumpe realisiert, die vorzugsweise für Diesel-Speichereinspritzsysteme (Common Rail) heutiger Diesel-Brennkraftmaschinen bestimmt ist Zur Erzielung verkürzter Hochdruckleitungen zwischen der Hochdruckpumpe und dem Hochdruckspeicher dieser Einspritzsysteme wird die Hochdruckpumpe von dem Steuertrieb bzw der Nockenwelle angetrieben Der dazu separat vom Steuertrieb vorgesehene Zugmittelantrieb verbindet die Laufscheiben des Abtriebsorgans vorzugsweise, eine mit der Nockenwelle verbundene Laufscheibe mit dem Abtriebsorgan, ausgebildet als eine der Hochdruckpumpe zugeordnete Laufscheibe.According to the invention, this object is achieved in a traction drive for a high-pressure pump, which is preferably for diesel storage injection systems (common rail) today diesel engines intended to achieve shortened high pressure lines between the high-pressure pump and the high-pressure accumulator of these injection systems, the high pressure pump is driven by the timing drive or the camshaft The provided separately from the control drive traction drive connects the pulleys of the output member preferably, one connected to the camshaft Running disk with the output member, designed as a high-pressure pump associated with the running disk.

Kraftstoff-Hochdruckpumpen weisen einen ungleichmäßigen Drehmomentenverlauf auf, wodurch diese Pumpen eine nachteilige Schwingungsanregung des Zugmittelantriebs auslösen, verbunden mit negativen Rückwirkungen auf den Steuertrieb bzw auf die Steuerzeiten der BrennkraftmaschineHigh-pressure fuel pumps have a non-uniform torque curve, whereby these pumps trigger a disadvantageous vibration excitation of Zugmittelantriebs, coupled with negative repercussions on the timing drive and the timing of the internal combustion engine

Der Antrieb einer Diesel-Hochdruckpumpe für ein Diesel-Speichereinspritzsystem erfordert keine genaue Winkellage zwischen den Abtriebsorgan und dem Antriebsorgan. Folglich kann dem Antriebsorgan des Zugmittelantriebs für eine Diesel-Hochdruckpumpe eine Freilaufeinheit zugeordnet werden. Durch diese Maßnahme werden kritische Wechselmomente aus dem Zugmittelantrieb abgekoppelt, verbunden mit einer Entlastung des Zugmittels, wodurch sich gleichzeitig ein gerauschoptimierter Zugmittelantrieb einstellt. Weiterhin unterbleibt eine nachteilige Überlagerung der funktionsbedingten Drehungleichformigkeit der Brennkraftmaschine mit den Wechselmomenten der Diesel-Hochdruckpumpe auf die zwei miteinander verbundenen ZugmitteltriebeThe drive of a diesel high pressure pump for a diesel storage injection system does not require a precise angular position between the output member and the drive member. Consequently, a freewheel unit can be assigned to the drive member of the traction mechanism drive for a diesel high-pressure pump. By this measure, critical alternating moments are disconnected from the traction mechanism, connected to a relief of the traction means, which simultaneously adjusts a noise-optimized traction mechanism. Furthermore, there is no disadvantageous superimposition of the function-related rotational non-uniformity of the internal combustion engine with the alternating torques of the diesel high-pressure pump on the two mutually connected traction drives

Erfindungsgemäß ist die Freilaufeinheit einem Aggregat mit einem stark schwankenden Antriebsmoment zugeordnet , das funktionsbedingt bzw. bedingt durch die Bauweise einen ungleichmäßigen Drehmomentverlauf aufweist und folglich den damit in Verbindung stehenden Zugmitteltrieb, insbesondere das Zugmittel stark beansprucht Die für einen Dieselmotor mit einem Speichereinspntzsystem (Common Rail) bestimmte Hochdruckpumpe ist zur Erzielung kurzer Druckleitungen zwischen dem Hochdruckspeicher und der Hochdruckpumpe im Bereich des Zylinderkopfes der Brennkraftmaschine angeordnet Dazu bietet es sich an, den Steuertneb der Brennkraftmaschine zum Antneb der Hochdruckpumpe zu nutzen Da für den Steuertneb ublicherweise ein Zugmitteltrieb vorgesehen ist, stellt der Hochdruckpumpenantrieb zwei in Reihe geschaltete Zugmitteltriebe der, wobei der erste, dem Steuertrieb zugeordnete Zugmitteltrieb einen direkten Winkelbezug zwischen dem Antnebsorgan und dem Abtriebsorgan, der Kurbelwelle und der Nockenwelle funktionsbedingt erfordert. Für den nachgeschalteten, dem Antrieb der Diesel-Hochdruckpumpe bestimmten zweiten Zugmitteltrieb, ist erfindungsgemäß dem Antriebsorgan die Freilaufeinheit zugeordnet, wodurch sich eine Beruhigung des Zugmittels einstellt, zur Erzielung eines geräuschoptimierten, die Lebensdauer erhöhenden Zugmitteltriebs.According to the invention, the freewheeling unit is associated with an aggregate with a strongly fluctuating drive torque, which due to the design has a non-uniform torque curve due to its design and consequently heavily strains the traction mechanism drive, in particular the traction means, which is associated with this. For a diesel engine with a common rail accumulator system certain high-pressure pump is arranged to achieve short pressure lines between the high-pressure accumulator and the high-pressure pump in the region of the cylinder head of the internal combustion engine It makes sense to use the Steuertneb the engine Antneb the high-pressure pump Since the Steuertneb usually a traction drive is provided, the high-pressure pump drive provides two connected in series traction drives of, wherein the first, the control drive associated traction drive a direct angular reference between the Antnebsorgan and the output member, the crankshaft and the camshaft requires function. For the downstream, the drive of the diesel high pressure pump specific second traction drive, according to the invention the drive member is associated with the freewheel unit, thereby adjusting a calming of the traction means, to achieve a noise-optimized, life-increasing traction mechanism.

Vorteilhafter Ausgestaltungen der Erfindung sind Gegenstand der abhängigen Ansprüche 2 bis 12.Advantageous embodiments of the invention are subject of the dependent claims 2 to 12.

Die Freilaufeinheit ist gemäß einer vorteilhaften Ausgestaltung der Erfindung in der Laufscheibe der Diesel-Hochdruckpumpe und damit in dem Antriebsorgan integriert. Der für die Freilaufeinheit vorgesehene Einbauraum ist radial innen von einem drehstarren mit der Pumpenwelle verbundener Innenring und außenseitig von einem Außenring der Laufscheibe begrenzt Zur Erzielung eines abgedichteten Einbauraumes und einer verbesserten Lebensdauer der Freilaufeinheit ist dem Einbauraum jeweils stirnseitig eine Abdichtung zugeordnet Als Abdichtung bietet sich an, diese drehstarr an dem Außenring der Laufscheibe zu befestigen, wobei die zugehörige Dichtlippe unter Einhaltung eines definierten Dichtspaltes bis an den Innenring herangeführt ist.The freewheel unit is integrated according to an advantageous embodiment of the invention in the rotor of the diesel high pressure pump and thus in the drive member. The installation space provided for the freewheel unit is bounded radially inwardly by a torsionally rigid inner ring connected to the pump shaft and externally by an outer ring of the running disk. To achieve a sealed installation space and an improved service life of the freewheel unit, a seal is assigned to the installation space at each end. to fix these torsionally rigid on the outer ring of the running disk, wherein the associated sealing lip is brought in compliance with a defined sealing gap up to the inner ring.

Eine erfindungsgemäße Weiterbildung sieht vor, die Freilaufeinheit innerhalb des Pumpengehäuses. anzuordnen, wobei die Freilaufeinheit zwei Wellenzapfen der Hochdruckpumpe verbindet. Vorteilhaft greift ein erster Wellenzapfen spielbehaftet in eine topfartige Aufnahme des zweiten Wellenzapfens ein, wobei sich ein kreisringförmiger Ringspalt bzw Einbauraum zur Aufnahme der Freilaufeinheit einstellt. Diese Anordnung bildet einen geschützten Einbauraum der Freilaufeinheit, die keine Abdichtung erfordert Durch die in das Pumpengehäuse verlagerte Freilaufeinheit ergibt sich ein vergroßerter Gestaltungsfreiraum für die Laufscheibe der Hochdruckpumpe einA further development according to the invention provides for the freewheel unit within the pump housing. to be arranged, wherein the freewheel unit connects two journals of the high-pressure pump. A first shaft journal advantageously engages in a pot-like receptacle of the second shaft journal, whereby an annular annular gap or installation space for receiving the freewheel unit adjusts. This arrangement forms a protected installation space of the freewheel unit, which requires no sealing. By the freewheel unit displaced into the pump housing, there is an increased freedom of design for the running disk of the high-pressure pump

Der Aufbau von Hochdruckpumpen für Diesel-Speichereinspritzsysteme sieht vor, diese Pumpen mit einer rotierenden Schwungmasse zu versehen, als Ausgleich für das schwankende Antriebsmoment, wodurch ein beruhigter Zugmitteltrieb realisiert werden kann.The construction of high-pressure pumps for diesel accumulator injection systems provides to provide these pumps with a rotating flywheel, as compensation for the fluctuating drive torque, whereby a calm traction drive can be realized.

Als Zugmittel für den Zugmittelantrieb, der zum Auftrieb der Hochdruckpumpe bestimmt ist, eignet sich bevorzugt ein Zahnriemen, um einen schlupffreien Antrieb zu gewährleisten Alternativ zu einem Zahnriemen schließt die Erfindung zum Antrieb der Hochdruckpumpe einen Flachriemen oder eine Kette als Zugmittel ein.As a traction means for Zugmittelantrieb, which is intended for buoyancy of the high-pressure pump, preferably a toothed belt to ensure a slip-free drive As an alternative to a toothed belt, the invention includes for driving the high-pressure pump, a flat belt or a chain as traction means.

Für die Funktion des Zugmittelantriebs ist eine Vorspannung des Zugmittels erforderlich, die vorzugsweise mittels einer separaten Spannvorrichtung erzielbar ist. Dazu eignet sich beispielsweise eine Exzenter-Spannvorrichtung, bei der eine federkraftbeaufschlagte Spannrolle oder Laufscheibe selbsttätig, vorzugsweise im Bereich des Leerturms, an dem Zugmittel abgestützt ist.For the function of Zugmittelantriebs a bias of the traction means is required, which is preferably achieved by means of a separate clamping device. For this purpose, for example, an eccentric tensioning device is suitable, in which a spring-loaded tensioning pulley or running disk is automatically supported on the traction means, preferably in the region of the empty tower.

Alternativ zu einer separaten Spannvorrichtung bietet sich eine schwenkbare Hochdruckpumpe an, die über ein Federelement abgestützt, eine erforderliche Vorspannkraft des Zugmittels sicherstellt. Dazu beaufschlagt das Federmittel die Hochdruckpumpe in eine das Zugmittel vorspannendende Drehrichtung Die schwenkbar angeordnete Hochdruckpumpe ist dabei über eine elastische Druckleitung mit dem Hochdruckspeicher des Diesel-Speichereinspritzsystems der Brennkraftmaschine verbunden.As an alternative to a separate tensioning device, a pivotable high-pressure pump is available, which is supported via a spring element and ensures a required pretensioning force of the traction mechanism. For this purpose, the spring means acted upon the high-pressure pump in a direction of rotation biasing the traction means The pivotally arranged high-pressure pump is connected via an elastic pressure line to the high-pressure accumulator of the diesel accumulator injection system of the internal combustion engine.

Der erfindungsgemäße Zugmittelantrieb umfasst bevorzugt eine als Klemmkörperfreilauf gestaltete Freilaufkupplung. Alternativ dazu schließt die Erfindung einen Klemmrollenfreilauf oder einen Hülsenfreilauf ein Da die Erfindung sich auf kein konkretes Freilaufkonzept beschränkt, bietet es sich weiterhin an, als Freilaufkupplung einen Schlingbandfreilauf einzusetzenThe traction mechanism drive according to the invention preferably comprises a one-way clutch configured as a sprag freewheel clutch. Alternatively, the invention includes a clamping roller freewheel or a sleeve freewheel Since the invention is not limited to a specific freewheel concept, it is still appropriate to use a freewheel clutch freewheel clutch

Kurze Beschreibungen der ZeichnungenShort descriptions of the drawings

Bevorzugte Ausfuhrungsbeispiele der Erfindung sind in drei Figuren dargestelltPreferred exemplary embodiments of the invention are shown in three figures

Es zeigen:

Figur 1
den Aufbau eines erfindungsgemäßen Zugmittelantriebs;
Figur 2
einen Teilbereich der im Schnitt dargestellten Hochdruckpumpe, gemäß dem Schnittverlauf 2-2, gemäß Figur 1,
Figur 3
einen Ausschnitt einer Hochdruckpumpe bei der die Freilaufeinheit innerhalb des Pumpengehäuses integriert ist.
Show it:
FIG. 1
the structure of a traction mechanism drive according to the invention;
FIG. 2
a portion of the high-pressure pump shown in section, according to the section line 2-2, according to FIG. 1 .
FIG. 3
a section of a high-pressure pump in which the freewheel unit is integrated within the pump housing.

Detaillierte Beschreibung der ZeichnungenDetailed description of the drawings

Die Figur 1 zeigt einen Zugmittelantrieb 1 zwischen einem Abtriebsorgan 2 und einem Antnebsorgan 3 Das Abtriebsorgan 2 stellt dabei eine drehstarre mit einer Nockenwelle einer Brennkraftmaschine verbundene Laufscheibe 4 dar, wobei die Nockenwelle und damit das Abtnebsorgan 2 einen Antrieb von einer in Figur 1 nicht abgebildeten, mit einer Kurbelwelle verbundenen Laufscheibe erfahrt, und dazu ein weiterer Zugmitteltrieb 5 vorgesehen ist Ein Zugmittel 7 verbindet das Abtriebsorgan 2 mit dem Antriebsorgan 3 und umschließt dabei zumindest teilweise die Laufscheibe 4 sowie die zugehörige, dem Antriebsorgan 3 zugeordnete Laufscheibe 6. Das eine Diesel-Hochdruckpumpe darstellende Antnebsorgan 3 umfasst eine, der Laufscheibe 6 zugeordnete Freilaufeinheit 8a. Zur Erzielung einer ausreichenden Vorspannung des Zugmittels 7 schließt der Zugmittelantrieb 1 weiterhin eine Spannvorrichtung 9 ein Diese selbsttätige, einen Exzenter einschließende Spannvorrichtung 9 stützt sich an dem im Uhrzeigersinn umlaufenden Zugmittelantriebs 1 im Leerturm an dem Zugmittel 7 ab Der Zugmittelantrieb 1 ist wie Figur 1 darstellt, dem Zugmittelantrieb 5 nachgeordnet und vermeidet eine nachteilige Übertragung einer Drehungleichformigkeit der Brennkraftmaschine von dem Abtnebsorgan 2 auf das Antriebsorgan 3 aufgrund der erfindungsgemäß in die Laufscheibe 6 integnerten Freilaufeinheit 8aThe FIG. 1 shows a traction mechanism drive 1 between a driven member 2 and a Antnebsorgan 3 The output member 2 is a torsionally rigid connected to a camshaft of an internal combustion engine running disk 4, wherein the camshaft and thus the Abtnebsorgan 2 a drive from an in FIG. 1 A traction means 7 connects the output member 2 with the drive member 3 and thereby at least partially surrounds the running disk 4 and the associated, the drive member 3 associated with running wheel 6. The one Diesel high-pressure pump performing Annebsorgan 3 includes a, the running disk 6 associated freewheeling unit 8a. To achieve a sufficient bias of the traction means 7 of Zugmittelantrieb 1 further includes a tensioning device 9 a this automatic, an eccentric enclosing clamping device 9 is based on the circulating in the clockwise traction mechanism 1 in the empty tower on the traction means 7 from the traction mechanism drive 1 is like FIG. 1 represents downstream of the traction mechanism 5 and avoids adverse transfer of rotationally non-uniformity of the internal combustion engine of the Abtnebsorgan 2 on the drive member 3 due to the present invention in the running disk 6 integnerten freewheeling unit 8a

Den Aufbau des Antriebsorgans 3, insbesondere die Einbaulage der Freilaufeinheit 8a innerhalb der Laufscheibe 6 verdeutlicht die Figur 2. Die Laufscheibe 6 umfasst einen drehstarr mit einer Pumpenwelle 11 a verbundenen Innenring 12, der radial beabstandet, unter Bildung eines kreisringförmigen Einbauraumes 15, von einem Außenring 16 umschlossen ist. Die in einem Gehäuse 14 einer Hochdruckpumpe wälzgelagerte Pumpenwelle 11a ist dabei über einen als Konusverband 13 ausgebildeten Pressverband mit der Laufscheibe 6 verbunden. Der Einbauraum 15 dient zur Aufnahme der Freilaufeinheit 8a, die mittig eine Freilaufkupplung 17a einschließt, der beidseitig ein Wälzlager 18, 19 zugeordnet ist. Zur Erzielung einer abgedichteten Freilaufkupplung 17a bietet es sich an, den Einbauraum 15 beidseitig mittels einer Abdichtung zu verschließen. Ausgehend von dem Gehäuse 14 der Hochdruckpumpe 20 ist der Laufscheibe 6 die Schwungmasse 10 vorgelagert. Die auf einer Führungsbuchse 21 zentrierte Schwungmasse 10 stützt sich axial an dem Innenring 12 der Laufscheibe 6 ab. Eine für die Funktion des Konusverbandes 13 erforderliche Axialkraft wird mittels der Führungsbuchse 21 erreicht, die gleichzeitig die Funktion einer Schraubenmutter ausübt, die auf einen endseitigen Gewindeabschnitt 22 der Pumpenwelle 11a verschraubt, über eine Schulter der Schwungmasse 10 eine Axialkraft auf den Konusverband 13 ausubtThe structure of the drive member 3, in particular the mounting position of the freewheeling unit 8a within the rotor disk 6 illustrates the FIG. 2 , The running disk 6 comprises a torsionally rigid with a pump shaft 11 a connected inner ring 12 which is radially spaced, with the formation of an annular mounting space 15, surrounded by an outer ring 16. The rolling in a housing 14 of a high-pressure pump pump shaft 11a is connected via a trained as a cone dressing 13 press fit with the running disk 6. The installation space 15 serves to accommodate the freewheeling unit 8a, which includes in the center an overrunning clutch 17a, which is assigned a rolling bearing 18, 19 on both sides. To achieve a sealed one-way clutch 17a, it makes sense to close the installation space 15 on both sides by means of a seal. Starting from the housing 14 of the high-pressure pump 20, the running disk 6 is preceded by the flywheel 10. Centered on a guide bushing 21 flywheel 10 is axially supported on the inner ring 12 of the rotor disk 6 from. An axial force required for the function of the conical bandage 13 is achieved by means of the guide bush 21, which at the same time performs the function of a nut screwed onto an end-side threaded portion 22 of the pump shaft 11a, exerting an axial force on the cone bandage 13 via a shoulder of the flywheel 10

Die Figur 3 zeigt einen zu Figur 2 abweichenden zweiteiligen Aufbau der Pumpenwelle 11b, die zwei Wellenzapfen 23, 24 einschließt Der über den Konusverband 13 kraft- und formschlüssig mit der Laufscheibe 6 verbundene Wellenzapfen 23 bildet eine topfartige Aufnahme 25, in die radial beabstandet der Wellenzapfen 24 eingreift Dabei bildet sich ein kreisförmiger Einbauraum 26, der zur Aufnahme der Freilaufeinheit 8b bestimmt ist Abweichend zu der Freilaufeinheit 8a gemaß Figur 2, schließt die Freilaufeinheit 8b gemäß Figur 3 nur ein seitlich der Freilaufkupplung 17b nebengeordnetes Wälzlager 27 ein. Der Wellenzapfen 23 ist über das Wälzlager 28 drehbar in dem Gehäuse 14 der Hochdruckpumpe 20 gelagertThe FIG. 3 shows you one FIG. 2 Deviating two-part construction of the pump shaft 11b, which includes two shaft journals 23, 24 The shaft journal 23 connected positively and positively to the running disk 6 via the cone union 13 forms a cup-shaped receptacle 25 into which the shaft journal 24 engages in a radially spaced manner 26, which is intended to receive the freewheel unit 8b Deviating from the freewheel unit 8a gemaß FIG. 2 , closes the freewheel unit 8b according to FIG. 3 only one side of the one-way clutch 17b juxtaposed bearings 27 a. The shaft journal 23 is rotatably supported by the roller bearing 28 in the housing 14 of the high-pressure pump 20

BezugszahlenlisteLIST OF REFERENCE NUMBERS

11
Zugmittelantriebtraction mechanism
22
Abtriebsorganoutput element
33
Antriebsorgandrive member
44
Laufscheibesheave
55
Zugmittelantriebtraction mechanism
66
Laufscheibesheave
77
Zugmitteltraction means
8a8a
FreilaufeinheitFreewheel unit
8b8b
FreilaufeinheitFreewheel unit
99
Spannvorrichtungjig
1010
SchwungmasseInertia
11a11a
Pumpenwellepump shaft
11 b11 b
Pumpenwellepump shaft
1212
Innenringinner ring
1313
Konusverbandcone Association
1414
Gehäusecasing
1515
Einbaurauminstallation space
1616
Außenringouter ring
17a17a
FreilaufkupplungOverrunning clutch
17b17b
FreilaufkupplungOverrunning clutch
1818
Wälzlagerroller bearing
1919
Wälzlagerroller bearing
2020
Hochdruckpumpehigh pressure pump
2121
Führungsbuchseguide bush
2222
Gewindeabschnittthreaded portion
2323
Wellenzapfenshaft journal
2424
Wellenzapfenshaft journal
2525
Aufnahmeadmission
2626
Einbaurauminstallation space
2727
Wälzlagerroller bearing
2828
WalzlagerRoller bearing

Claims (12)

  1. Flexible drive which is provided for driving at least one assembly of an internal combustion engine and comprises a drawing means (7) which connects pulleys (4, 6) of an output element (2) and a drive element (3), a freewheeling unit (8a, 8b), comprising a freewheeling clutch (17a, 17b) and at least one roller bearing (18, 19, 27) being inserted in a circularly annular installation space (15, 26) between radially spaced-apart machine parts of the drive element (3), the freewheeling clutch (17a, 17b) driving the drive element (3) only at an accelerated angular velocity during fluctuations in an angular velocity, characterized in that the freewheeling unit (8a, 8b) is assigned to a high-pressure pump having a fluctuating drive moment, the flexible drive (1) of the drive element (3) being connected to a flexible drive (5) which is configured as timing drive of the internal combustion engine.
  2. Flexible drive according to Claim 1, the freewheeling unit (8a) being assigned to an installation space (15) of the drive element (3), which installation space (15) is delimited on the inside by an inner ring (12) which is connected rigidly in terms of rotation to a pump shaft (11a) and on the outside by an outer ring (16) of the pulley (6).
  3. Flexible drive according to Claim 1, the freewheeling unit (8b) of which is inserted within a housing (14) of the high-pressure pump (20) in such a way that it connects two shaft journals (23, 24) of the high-pressure pump (20).
  4. Flexible drive according to Claim 3, a first shaft journal (24) engaging into a cup-shaped receptacle (25) of the second shaft journal (24) and the freewheeling unit (8b) being inserted into a circularly annular installation space (26) which is produced between the receptacle (25) and the shaft journal (24).
  5. Flexible drive according to Claim 1, the high-pressure pump (20) including a circulating flywheel mass (10) which is connected to the pump shaft (11a).
  6. Flexible drive according to Claim 1, a toothed belt being provided as drawing means (7), which toothed belt encloses the pulleys (4, 6) at least partially and in the process engages in a positively locking manner into a profiled circumferential face of the pulleys (4, 6).
  7. Flexible drive according to Claim 1 which is assigned a tensioning apparatus (9) which preferably bears in a non-positive manner against the drawing means (7) in an empty run.
  8. Flexible drive according to Claim 1, intended for a high-pressure pump (20) which can pivot about a pivot point, is supported against a spring means and at the same time includes the function of a tensioning apparatus.
  9. Flexible drive according to Claim 1, the freewheeling unit (8a, 8b) comprising a freewheeling clutch (17a, 17b) which is configured as a clamping-body freewheel.
  10. Flexible drive according to Claim 1, in which the freewheeling unit (8a, 8b) has a freewheeling clutch (17a, 17b) which is configured as a clamping-roller freewheel.
  11. Flexible drive according to Claim 1, in which the freewheeling unit (8a, 8b) has a freewheeling clutch (17a, 17b) which is configured as a sleeve-type freewheel.
  12. Flexible drive according to Claim 1, the freewheeling unit (8a, 8b) of which comprises a freewheeling clutch (17a, 17b) which is configured as a belt loop freewheel.
EP20040004793 2003-03-24 2004-03-02 Belt drive Expired - Lifetime EP1462630B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10313132 2003-03-24
DE2003113132 DE10313132A1 (en) 2003-03-24 2003-03-24 traction mechanism

Publications (2)

Publication Number Publication Date
EP1462630A1 EP1462630A1 (en) 2004-09-29
EP1462630B1 true EP1462630B1 (en) 2008-05-28

Family

ID=32798076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040004793 Expired - Lifetime EP1462630B1 (en) 2003-03-24 2004-03-02 Belt drive

Country Status (2)

Country Link
EP (1) EP1462630B1 (en)
DE (2) DE10313132A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230126647A1 (en) * 2020-03-19 2023-04-27 Vacuworx Global, LLC Belt Drive For Use With A Vacuum Material Handler

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156573A (en) * 1991-06-05 1992-10-20 Litens Automotive Partnership Serpentine drive with coil spring-one-way clutch alternator connection
DE4309548A1 (en) * 1993-03-24 1994-09-29 Schaeffler Waelzlager Kg Drive of at least one auxiliary unit of an internal combustion engine
DE9417045U1 (en) 1994-10-22 1994-12-15 INA Wälzlager Schaeffler KG, 91074 Herzogenaurach Device for damping torsional vibrations in a drive train
DE19624240C5 (en) * 1996-06-18 2011-07-28 Daimler AG, 70327 Internal combustion engine
JP3391750B2 (en) * 1999-10-28 2003-03-31 株式会社デンソー Vehicle accessory drive
DE10151795A1 (en) * 2001-10-19 2003-04-30 Ina Schaeffler Kg pulley

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DE502004007255D1 (en) 2008-07-10
EP1462630A1 (en) 2004-09-29
DE10313132A1 (en) 2004-11-11

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