EP1454043B1 - Variable belt drive for accessories - Google Patents

Variable belt drive for accessories Download PDF

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Publication number
EP1454043B1
EP1454043B1 EP02790363A EP02790363A EP1454043B1 EP 1454043 B1 EP1454043 B1 EP 1454043B1 EP 02790363 A EP02790363 A EP 02790363A EP 02790363 A EP02790363 A EP 02790363A EP 1454043 B1 EP1454043 B1 EP 1454043B1
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EP
European Patent Office
Prior art keywords
drive
pulley
drive pulley
crankshaft
input part
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EP02790363A
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German (de)
French (fr)
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EP1454043A1 (en
Inventor
Norbert Amann
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines 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
    • F02B67/04—Engines 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
    • F02B67/06—Engines 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/06—Endless member is a belt

Definitions

  • the invention relates according to the preamble of claim 1 a Device for driving auxiliary units with two from each other different ratios, which input side with the Crankshaft of an internal combustion engine by means of fastening screws connected input part, the output side two drive pulleys with different diameters for driving the ancillaries and between the input part and the drive pulleys one from a magnetic coupling and Having an overrunning clutch existing switching module, wherein the larger Drive pulley the magnetic clutch and the smaller pulley the freewheel is assigned and at low crankshaft speeds, a drive of Ancillaries by means of the larger drive pulley and at high Crankshaft speeds a drive of the ancillaries by means of the smaller Drive pulley takes place.
  • crankshaft coaxially arranged devices are in stages switchable drive of ancillaries became known in this Connection is exemplified by DE 198 22 426 C2 and DE 196 23 525 A1 called. Both arrangements include planetary gear, have a very complex structure and take particular advantage in the axial direction a large space.
  • the FR 23 78 948 discloses a drive for ancillaries of a Internal combustion engine, with which all ancillaries with two speeds are drivable. At least one with clutch and overrunning clutch on the crankshaft attached and connected to a countershaft Pulleys are rigidly connected to a third pulley and drive another accessory.
  • An electromagnetically designed clutch allows a shift of the switching points at the transition of one of the Gear ratios to another. The arrangement comprises in particular due to the power flow over the countershaft a variety of pulleys and straps.
  • US 4,571,227 which discloses an accessory drive for a Internal combustion engine with a larger and a smaller drive pulley for A two-speed drive disclosed includes an input section Flange portion for attachment to the crankshaft and these in axial Direction then a first and a second shaft portion, wherein the smaller drive pulley on the first shaft section and the larger one Drive disk is mounted on the second shaft portion.
  • the screw connection of the flange portion of the input part with the crankshaft is located on a large Diameter, while the outer diameter of the small drive pulley barely larger than this diameter, so to accommodate the smaller Drive pulley a subsequent to the flange in the axial direction, separate wave area is provided.
  • the arrangement therefore has a large Construction length.
  • the object of the invention is a variable belt high-lift for ancillaries which is independent of the ancillaries to be driven, which is simple and thus both inexpensive to produce as well is mounted and which in particular in the axial direction only a small Space occupied.
  • the object is achieved by a device having the features of Claim 1, wherein according to the underlying idea, the input part a flange portion and a shaft portion and the smaller Drive pulley on the connected to the crankshaft flange of the Entrance part is arranged.
  • a drive by means of the small drive pulley is expedient at switched off magnetic coupling, the large drive pulley runs with empty and a drive by means of the large drive pulley takes place when switched on Magnetic clutch, wherein between large and small drive pulley of the freewheel is effective.
  • the small drive pulley forms together with a first another disc a first translation stage and the large drive pulley a second translation stage together with a second further disc;
  • the transmission ratio is from first to second Translation level 0.4 to 0.7, in particular 0.5 to 0.6.
  • the switching from one gear ratio to another is advantageously carried out at a crankshaft speed of 1100 to 2000 min -1 , especially at 1400 to 1600 min -1 , wherein at lower crankshaft speed of the drive via the large drive wheel and at higher crankshaft speed of the drive via the small drive wheel ,
  • Figure 1 shows a schematic diagram of a device for driving Auxiliary units with drive 10 and output 11, 12 and division of the Power flow on two strands 13, 14.
  • the strand 13 includes one Overrunning clutch 15, strand 14 a present designed as a magnetic coupling Disconnect 16.
  • the disconnect clutch 16 When the disconnect clutch 16 is open, the power flow from Drive 10 in strand 13 via the freewheel 15 operated in the blocking direction Output 12, which for example as a drive pulley with a small diameter is formed, so that a drive of the ancillaries with lesser Speed is done.
  • the power flow takes place from the drive 10 in the strand 14 via the closed coupling 16 to the output 11, which, for example, designed as a large diameter drive pulley is, so that a drive of the ancillaries takes place at a higher speed.
  • the freewheel 15 in the strand 13 is in the freewheeling direction during operation, whereby a clamping the strands 13 and 14 against each other is prevented.
  • FIG. 1 An embodiment of two drive pulleys 24, 30 with integrated switching module is shown in FIG.
  • a plurality of circumferentially distributed screws 21st is the input part 20 of the drive device 33 with the not shown here Crankshaft of an internal combustion engine connected.
  • a hub profile 25 with the input part 20 is rotatably connected to a disc 28, which at energized electromagnet 31 via a friction lining 29 with a large Pulley 30 frictionally connected.
  • connection of the disc 28 with the input part 20 it can of course also be appropriate to provide another shaft / hub connection, wherein
  • a positive connection such as passport or Sliding spring, a splined or toothed shaft connection, a polygon connection, a Stim tooth connection, a pin connection or a non-positive connection can act in the form of a cylindrical or conical interference fit.
  • the pulley 30 is by means of two deep groove ball bearings 27 a, 27 b on a sleeve-shaped extension 28a of the disc 28 relative to the input part 20 rotatable stored as well as the electromagnet 31, which also by means of a Torque support 32 is fixed to the housing against rotation.
  • the electromagnet 31 which also by means of a Torque support 32 is fixed to the housing against rotation.
  • a small pulley 24 is by means of two deep groove ball bearings 22a, 22b on the input part 20 radially outside of the fastening screws 21st stored, axially between the deep groove ball bearings 22a, 22b is a freewheel 23rd arranged, which the relative rotation of the pulley 24 input part 20 in allows one direction and blocks in the other direction.
  • the electromagnet 31 is energized, so that via the friction lining 29 is a frictional force transmission from the pulley 28 to the pulley 30.
  • a positive switchable connection between the disc 28 and pulley 30 executable, but reinforced shift shocks are taken into account.
  • the freewheel 23 is in the freewheeling direction in operation, so that a distortion due to the different translations of the two pulleys 24, 30 is prevented.
  • the electromagnet 31 is de-energized, whereby the pulley 30 is decoupled from the disc 28 and thus from the input part 20.
  • the power flow is now via the freewheel 23 operated in the reverse direction, so that the drive of the auxiliary units takes place at higher crankshaft speeds by means of the small pulley 24; An adapted, uniform operation of the ancillaries, which better meets their operating ranges, is achieved.
  • FIG. 3 shows a drive device 38 in operation with ancillary units 35, 41, 42 shown.
  • the crankshaft of an internal combustion engine not shown here Coaxially arranged drive means 38, as shown in detail with Figure 2 and is driven by the crankshaft in the arrow direction.
  • the smaller pulley, which is arranged on the engine side forms together with the drive belt 39b the belt plane, while the large Pulley, which on the side facing away from the engine is arranged, together with the shift belt 39a forms the switching plane.
  • the drive takes place in the Switching plane arranged on a on the shaft of a power steering pump 41 Pulley 40 a, which together with the pulley 30 a first Translation stage forms;
  • the power flow continues via a coaxial to Pulley 40a, also arranged on the power steering pump shaft Pulley 40b in the switching plane, the belt 39b of the direction of rotation following a water pump 35 and a generator 42 drives.
  • the belts 39a, 39b are each using.
  • Tension rollers 36, 37 held under tension.
  • the drive is the Auxiliary units with open magnetic coupling directly in the drive level by means of the small pulley of the drive device 38, which with the Pulley 40b of the power steering pump 41 forms a second gear ratio.
  • the expediently Pulleys which with the pulleys 24, 30 of the drive device 38 form the gear ratios, not the power steering pump 41, but a associated with other accessory such as water pump 35 or generator 42.
  • the second ratio for the upper speed range of the internal combustion engine is i 1 ⁇ 0.9 to 1, 3, in particular about 1.06.
  • the boundary between the upper and lower speed range of the internal combustion engine is present above 1100 min -1, preferably at 1400 to 2000 min -1, in particular at approximately 1500 min -1. It may be appropriate if .the. Switching is hysteresis, so that switching takes place depending on the switching direction at different speeds; the hysteresis is in the range of 50 to 200 min -1 , in particular it is about 100 min -1 .

Description

Die Erfindung betrifft gemäß dem Oberbegriff des Patentanspruches 1 eine Einrichtung zum Antrieb von Nebenaggregaten mit zwei voneinander unterschiedlichen Übersetzungsverhältnissen, welche eingangsseitig ein mit der Kurbelwelle eines Verbrennungsmotors mittels Befestigungsschrauben verbundenes Eingangsteil, ausgangsseitig zwei Antriebsscheiben mit unterschiedlichen Durchmessern zum Antrieb der Nebenaggregate und zwischen dem Eingangsteil und den Antriebsscheiben ein aus einer Magnetkupplung und einem Überholfreilauf bestehendes Schaltmodul aufweist, wobei der größeren Antriebsscheibe die Magnetkupplung und der kleineren Antriebsscheibe der Freilauf zugeordnet ist und bei geringen Kurbelwellendrehzahlen ein Antrieb der Nebenaggregate mittels der größeren Antriebsscheibe und bei hohen Kurbelwellendrehzahlen ein Antrieb der Nebenaggregate mittels der kleineren Antriebsscheibe erfolgt.The invention relates according to the preamble of claim 1 a Device for driving auxiliary units with two from each other different ratios, which input side with the Crankshaft of an internal combustion engine by means of fastening screws connected input part, the output side two drive pulleys with different diameters for driving the ancillaries and between the input part and the drive pulleys one from a magnetic coupling and Having an overrunning clutch existing switching module, wherein the larger Drive pulley the magnetic clutch and the smaller pulley the freewheel is assigned and at low crankshaft speeds, a drive of Ancillaries by means of the larger drive pulley and at high Crankshaft speeds a drive of the ancillaries by means of the smaller Drive pulley takes place.

Beim Antrieb von Nebenaggregaten von Brennkraftmaschinen stellt sich das Problem, dass die Brennkraftmaschine über einen weiten Drehzahlbereich von in mehreren 1000 min-1 bis etwa 7000 - 9000 min-1 betrieben wird, während es in Hinblick auf die Nebenaggregate wünschenswert ist, den Betriebsbereich auf einen engeren Drehzahlbereich zu begrenzen. When driving ancillary components of internal combustion engines, the problem that the internal combustion engine is operated over a wide speed range of in several 1000 min -1 to about 7000 - 9000 min -1 , while it is desirable in terms of ancillaries, the operating range to a limit the narrower speed range.

Aus diesem Grund sind verschiedene Vorrichtungen bekannt geworden, welche einen variablen Antrieb der Nebenaggregate durch Umschalten zwischen Übersetzungsstufen erreichen. Beispiele geben die DE 38 00 346 C2 sowie die FR 24 86 610, welche jeweils einen vergleichmäßigten Antrieb riemengetriebener Nebenaggregate ermöglichen, indem mittels eines Elektromagneten ein Umschalten zwischen Übersetzungsstufen erfolgt. Die Umschalteinrichtung bei der in der DE 38 00 346 C2 beschriebenen Vorrichtung zum Antrieb einer Eingangswelle eines Wechselstromgenerators eines Kraftfahrzeugmotors ist in den Generator integriert, wodurch der Einsatz eines besonderen, nicht serienmäßigen Generators notwendig ist. Auch bei der in der FR 24 86 610 beschriebenen Anordnung ist die Umschalteinrichtung aggregatsseitig - in diesem Fall an der Wasserpumpe - angeordnet, so das auch hier eine Abhängigkeit vom Nebenaggregat besteht.For this reason, various devices have become known which a variable drive of the ancillaries by switching between Achieve translation levels. Examples are DE 38 00 346 C2 and FR 24 86 610, which each have a uniform drive belt-driven Enable ancillaries by means of an electromagnet Switching between translation stages takes place. The switching device at the In DE 38 00 346 C2 described device for driving a Input shaft of an alternator of an automotive engine is in the Generator integrated, which makes the use of a special, non-standard Generator is necessary. Also described in the FR 24 86 610 Arrangement is the switching device on the unit side - in this case at the Water pump - arranged, so here too a dependency on Accessory exists.

Weiterhin sind auch zur Kurbelwelle koaxial angeordnete Vorrichtungen zum stufig schaltbaren Antrieb von Nebenaggregaten bekannt geworden, in diesem Zusammenhang werden beispielhaft die DE 198 22 426 C2 sowie die DE 196 23 525 A1 genannt. Beide Anordnungen umfassen Planetengetriebe, weisen einen sehr komplexen Aufbau auf und beanspruchen insbesondere in axialer Richtung einen großen Bauraum.Furthermore, also the crankshaft coaxially arranged devices are in stages switchable drive of ancillaries became known in this Connection is exemplified by DE 198 22 426 C2 and DE 196 23 525 A1 called. Both arrangements include planetary gear, have a very complex structure and take particular advantage in the axial direction a large space.

Die FR 23 78 948 offenbart einen Antrieb für Nebenaggregate einer Brennkraftmaschine, mit dem alle Nebenaggregate mit zwei Geschwindigkeiten antreibbar sind. Mindestens eine der mit Schaltkupplung und Freilaufkupplung auf der Kurbelwelle aufgesetzten und mit einem Vorgelege verbundenen Riemenscheiben ist mit einer dritten Riemenscheibe starr verbunden und treibt ein weiteres Nebenaggregat an. Eine elektromagnetisch ausgebildete Schaltkupplung erlaubt eine Verschiebung der Schaltpunkte am Übergang von einem der Übersetzungsverhältnisse zum anderen. Die Anordnung umfasst insbesondere aufgrund des Kraftflusses über das Vorgelege eine Vielzahl von Riemenscheiben und Riemen.The FR 23 78 948 discloses a drive for ancillaries of a Internal combustion engine, with which all ancillaries with two speeds are drivable. At least one with clutch and overrunning clutch on the crankshaft attached and connected to a countershaft Pulleys are rigidly connected to a third pulley and drive another accessory. An electromagnetically designed clutch allows a shift of the switching points at the transition of one of the Gear ratios to another. The arrangement comprises in particular due to the power flow over the countershaft a variety of pulleys and straps.

Gemäß der US 4,571,227, welche einen Nebenaggregateantrieb für eine Brennkraftmaschine mit einer größeren und einer kleineren Antriebsscheibe zum Antrieb mit zwei Geschwindigkeiten offenbart, umfasst ein Eingangsteil einen Flanschabschnitt zur Befestigung an der Kurbelwelle und an diesen in axialer Richtung anschließend einen ersten und einen zweiten Wellenabschnitt, wobei die kleinere Antriebsscheibe auf dem ersten Wellenabschnitt und die größere Antriebsscheibe auf dem zweiten Wellenabschnitt gelagert ist. Die Verschraubung des Flanschbereichs des Eingangsteils mit der Kurbelwelle liegt auf einem großen Durchmesser, während der Außendurchmesser der kleinen Antriebsscheibe kaum größer als dieser Durchmesser ist, sodass zur Aufnahme der kleineren Antriebsscheibe ein an den Flanschbereich in axialer Richtung anschließender, gesonderter Wellenbereich vorgesehen ist. Die Anordnung weist daher eine große Baulänge auf.According to US 4,571,227, which discloses an accessory drive for a Internal combustion engine with a larger and a smaller drive pulley for A two-speed drive disclosed includes an input section Flange portion for attachment to the crankshaft and these in axial Direction then a first and a second shaft portion, wherein the smaller drive pulley on the first shaft section and the larger one Drive disk is mounted on the second shaft portion. The screw connection of the flange portion of the input part with the crankshaft is located on a large Diameter, while the outer diameter of the small drive pulley barely larger than this diameter, so to accommodate the smaller Drive pulley a subsequent to the flange in the axial direction, separate wave area is provided. The arrangement therefore has a large Construction length.

Aufgabe der Erfindung ist es, einen variablen Riemenhochtrieb für Nebenaggregate bereitzustellen, welcher von den anzutreibenden Nebenaggregaten unabhängig ist, welcher einfach aufgebaut ist und somit sowohl günstig herzustellen als auch zu montieren ist und welcher insbesondere in axialer Richtung einen nur geringen Bauraum beansprucht.The object of the invention is a variable belt high-lift for ancillaries which is independent of the ancillaries to be driven, which is simple and thus both inexpensive to produce as well is mounted and which in particular in the axial direction only a small Space occupied.

Die Lösung der Aufgabe erfolgt durch eine Einrichtung mit den Merkmalen des Patentanspruches 1, wobei gemäß der zugrundeliegenden Idee das Eingangsteil einen Flanschabschnitt und einen Wellenabschnitt umfasst und die kleinere Antriebsscheibe auf dem mit der Kurbelwelle verbundenen Flanschabschnitt des Eingangsteils angeordnet ist.The object is achieved by a device having the features of Claim 1, wherein according to the underlying idea, the input part a flange portion and a shaft portion and the smaller Drive pulley on the connected to the crankshaft flange of the Entrance part is arranged.

Ein Ausführungsbeispiel sowie dessen Weiterbildungen sind Gegenstand der Unteransprüche.An embodiment and its developments are the subject of Dependent claims.

Besonders von Vorteil ist es, wenn die Befestigungsschrauben radial innerhalb der Lager angeordnet sind.It is particularly advantageous if the fastening screws radially inside the Bearings are arranged.

Bevorzugterweise ist das gesamte, aus Magnetkupplung und Freilauf bestehende Schaltmodul in die Antriebsscheiben integriert, so dass eine insbesondere in axialer Richtung kompakte Bauweise erreicht wird. Dabei ist es zweckmäßig, den Kupplungsmagnet im großen Antriebsrad und den Freilauf im kleinen Antriebsrad zu integrieren.Preferably, the whole, consisting of magnetic coupling and freewheel Switching module integrated into the drive pulleys, so that one in particular in the axial Direction compact design is achieved. It is appropriate, the Clutch magnet in the large drive wheel and the freewheel in the small drive wheel to integrate.

Ein Antrieb mittels der kleinen Antriebsscheibe erfolgt zweckmäßig bei ausgeschalteter Magnetkupplung, wobei die große Antriebsscheibe leer mit läuft und ein Antrieb mittels der großen Antriebsscheibe erfolgt bei eingeschalteter Magnetkupplung, wobei zwischen großer und kleiner Antriebsscheibe der Freilauf wirksam ist. Dabei bildet die kleine Antriebsscheibe zusammen mit einer ersten weiteren Scheibe eine erste Übersetzungsstufe und die große Antriebsscheibe zusammen mit einer zweiten weiteren Scheibe eine zweite Übersetzungsstufe; bevorzugterweise beträgt das Übersetzungsverhältnis von erster zu zweiter Übersetzungsstufe 0,4 bis 0,7, insbesondere 0,5 bis 0,6.A drive by means of the small drive pulley is expedient at switched off magnetic coupling, the large drive pulley runs with empty and a drive by means of the large drive pulley takes place when switched on Magnetic clutch, wherein between large and small drive pulley of the freewheel is effective. The small drive pulley forms together with a first another disc a first translation stage and the large drive pulley a second translation stage together with a second further disc; Preferably, the transmission ratio is from first to second Translation level 0.4 to 0.7, in particular 0.5 to 0.6.

Die Umschaltung von einer Übersetzungsstufe zur anderen erfolgt vorteilhafterweise bei einer Kurbelwellendrehzahl von 1100 bis 2000 min-1, insbesondere bei 1400 bis 1600 min-1, wobei bei geringerer Kurbelwellendrehzahl der Antrieb über das große Antriebsrad und bei höherer Kurbelwellendrehzahl der Antrieb über das kleine Antriebsrad erfolgt.The switching from one gear ratio to another is advantageously carried out at a crankshaft speed of 1100 to 2000 min -1 , especially at 1400 to 1600 min -1 , wherein at lower crankshaft speed of the drive via the large drive wheel and at higher crankshaft speed of the drive via the small drive wheel ,

Nachfolgend wird eine Ausführungsbeispiel der Erfindung unter Bezugnahme auf Figuren näher dargestellt; dabei zeigen schematisch und beispielhaft

Figur 1
eine Prinzipdarstellung einer Antriebseinrichtung mit Antrieb und Abtrieb sowie Aufteilung des Kraftflusses auf zwei Stränge,
Figur 2
zwei Antriebsscheiben mit integriertem Schaltmodul sowie
Figur 3
eine Antriebseinrichtung im Betrieb mit Nebenaggregaten.
An embodiment of the invention with reference to figures is shown in more detail below; thereby show schematically and by way of example
FIG. 1
a schematic representation of a drive device with drive and output and distribution of the power flow on two strands,
FIG. 2
two traction sheaves with integrated switching module as well
FIG. 3
a drive device in operation with ancillaries.

Figur 1 zeigt eine Prinzipdarstellung einer Einrichtung zum Antrieb von Nebenaggregaten mit Antrieb 10 und Abtrieb 11, 12 sowie Aufteilung des Kraftflusses auf zwei Stränge 13, 14. Ausgehend vom Antrieb 10, welcher mit der Kurbelwelle einer Brennkraftmaschine verbunden ist, erfolgt eine Verzweigung des Kraftflusses auf zwei Stränge 13 und 14. Der Strang 13 umfasst dabei einen Überholfreilauf 15, Strang 14 eine vorliegend als Magnetkupplung ausgebildete Trennkupplung 16. Bei geöffneter Trennkupplung 16 erfolgt der Kraftfluss vom Antrieb 10 im Strang 13 über den in Sperrichtung betriebenen Freilauf 15 zum Abtrieb 12, welcher beispielsweise als Antriebsscheibe mit kleinem Durchmesser ausgebildet ist, so dass ein Antrieb der Nebenaggregate mit geringerer Geschwindigkeit erfolgt. Bei geschlossener Trennkupplung 16 erfolgt der Kraftfluss vom Antrieb 10 im Strang 14 über die geschlossene Kupplung 16 zum Abtrieb 11, welcher beispielsweise als Antriebsscheibe mit großem Durchmesser ausgebildet ist, so dass ein Antrieb der Nebenaggregate mit höherer Geschwindigkeit erfolgt. Der Freilauf 15 im Strang 13 ist dabei in Freilaufrichtung im Betrieb, wodurch ein verspannen der Stränge 13 und 14 gegeneinander verhindert wird.Figure 1 shows a schematic diagram of a device for driving Auxiliary units with drive 10 and output 11, 12 and division of the Power flow on two strands 13, 14. Starting from the drive 10, which with the Crankshaft of an internal combustion engine is connected, takes place a branch of the Force flow on two strands 13 and 14. The strand 13 includes one Overrunning clutch 15, strand 14 a present designed as a magnetic coupling Disconnect 16. When the disconnect clutch 16 is open, the power flow from Drive 10 in strand 13 via the freewheel 15 operated in the blocking direction Output 12, which for example as a drive pulley with a small diameter is formed, so that a drive of the ancillaries with lesser Speed is done. When the separating clutch 16 is closed, the power flow takes place from the drive 10 in the strand 14 via the closed coupling 16 to the output 11, which, for example, designed as a large diameter drive pulley is, so that a drive of the ancillaries takes place at a higher speed. The freewheel 15 in the strand 13 is in the freewheeling direction during operation, whereby a clamping the strands 13 and 14 against each other is prevented.

Eine Ausgestaltung zweier Antriebsscheiben 24, 30 mit integriertem Schaltmodul ist in Figur 2 gezeigt. Mittels einer Mehrzahl über den Umfang verteilter Schauben 21 ist das Eingangsteil 20 der Antriebseinrichtung 33 mit der hier nicht näher gezeigten Kurbelwelle einer Brennkraftmaschine verbunden. Über ein Zahnnabenprofil 25 mit dem Eingangsteil 20 drehfest verbunden ist eine Scheibe 28, welche bei bestromten Elektromagnet 31 über einen Reibbelag 29 mit einer großen Riemenscheibe 30 reibschlüssig verbindbar ist.An embodiment of two drive pulleys 24, 30 with integrated switching module is shown in FIG. By means of a plurality of circumferentially distributed screws 21st is the input part 20 of the drive device 33 with the not shown here Crankshaft of an internal combustion engine connected. About a hub profile 25 with the input part 20 is rotatably connected to a disc 28, which at energized electromagnet 31 via a friction lining 29 with a large Pulley 30 frictionally connected.

Zur Verbindung der Scheibe 28 mit dem Eingangsteil 20 kann es selbstverständlich ebenso zweckmäßig sein, eine andere Welle/Nabe-Verbindung vorzusehen, wobei es sich beispielsweise um eine formschlüssige Verbindung etwa mittels Pass- oder Schiebefeder, eine Keil- oder Zahnwellenverbindung, eine Polygonverbindung, eine Stimzahnverbindung, eine Stiftverbindung oder um eine kraftschlüssige Verbindung in Form eines zylindrischen oder kegeligen Pressverbandes handeln kann.For connection of the disc 28 with the input part 20, it can of course also be appropriate to provide another shaft / hub connection, wherein For example, it is a positive connection such as passport or Sliding spring, a splined or toothed shaft connection, a polygon connection, a Stim tooth connection, a pin connection or a non-positive connection can act in the form of a cylindrical or conical interference fit.

Die Riemenscheibe 30 ist mittels zweier Rillenkugellager 27a, 27b auf einem buchsenförmigen Fortsatz 28a der Scheibe 28 relativ zum Eingangsteil 20 drehbar gelagert ebenso, wie der Elektromagnet 31, welcher zudem mittels einer Drehmomentstütze 32 gehäusefest gegen Verdrehen gesichert ist. Dabei ermöglicht die Anwendung des Zahnnabeprofils 25 die Verwendung kleiner Lager 26, 27a, 27b. Eine kleine Riemenscheibe 24 ist mittels zweier Rillenkugellager 22a, 22b auf dem Eingangsteil 20 radial außerhalb der Befestigungsschrauben 21 gelagert, axial zwischen den Rillenkugellagern 22a, 22b ist eine Freilauf 23 angeordnet, welcher die Relativdrehung der Riemenscheibe 24 Eingangsteil 20 in einer Richtung gestattet und in der anderen Richtung sperrt.The pulley 30 is by means of two deep groove ball bearings 27 a, 27 b on a sleeve-shaped extension 28a of the disc 28 relative to the input part 20 rotatable stored as well as the electromagnet 31, which also by means of a Torque support 32 is fixed to the housing against rotation. there allows the application of the Zahnnabeprofils 25, the use of small bearings 26, 27a, 27b. A small pulley 24 is by means of two deep groove ball bearings 22a, 22b on the input part 20 radially outside of the fastening screws 21st stored, axially between the deep groove ball bearings 22a, 22b is a freewheel 23rd arranged, which the relative rotation of the pulley 24 input part 20 in allows one direction and blocks in the other direction.

Insbesondere in Hinblick auf den Bauraum und die Herstellungskosten ist es gegebenenfalls zweckmäßig, wenn an Stelle der Rillenkugellager 27a, 27b Gleitlager verwendet werden. Auch die Verwendung anderer Wälzlager ist möglich.Especially with regard to the installation space and the production costs, it is if appropriate, if instead of the deep groove ball bearings 27a, 27b Plain bearings are used. The use of other bearings is possible.

Im unteren Drehzahlbereich zwischen Leerlaufdrehzahl und ca. 1500 min-1 der Brennkraftmaschine ist der Elektromagnet 31 bestromt, so dass über den Reibbelag 29 eine reibschlüssige Kraftübertragung von der Scheibe 28 auf die Riemenscheibe 30 erfolgt. Gegebenenfalls ist auch eine formschlüssige schaltbare Verbindung zwischen Scheibe 28 und Riemenscheibe 30 ausführbar, wobei jedoch verstärkte Schaltstöße zu berücksichtigen sind. Der Freilauf 23 ist dabei in Freilaufrichtung in Betrieb, so dass ein Verspannen aufgrund der unterschiedlichen Übersetzungen der beiden Riemenscheiben 24, 30 verhindert wird.In the lower speed range between idle speed and about 1500 min -1 of the internal combustion engine, the electromagnet 31 is energized, so that via the friction lining 29 is a frictional force transmission from the pulley 28 to the pulley 30. Optionally, a positive switchable connection between the disc 28 and pulley 30 executable, but reinforced shift shocks are taken into account. The freewheel 23 is in the freewheeling direction in operation, so that a distortion due to the different translations of the two pulleys 24, 30 is prevented.

Im Bereich oberhalb ca. 1500 min-1 ist der Elektromagnet 31 stromlos, wodurch die Riemenscheibe 30 von der Scheibe 28 und somit vom Eingangsteil 20 entkoppelt ist. Der Kraftfluss erfolgt nun über den in Sperrichtung betriebenen Freilauf 23, so dass der Antrieb der Nebenaggregate bei höheren Kurbelwellendrehzahlen mittels der kleinen Riemenscheibe 24 erfolgt; ein angepasster, vergleichmäßigter Betrieb der Nebenaggregate, welcher deren Betriebsbereichen besser gerecht wird, wird erreicht.In the range above about 1500 min -1 , the electromagnet 31 is de-energized, whereby the pulley 30 is decoupled from the disc 28 and thus from the input part 20. The power flow is now via the freewheel 23 operated in the reverse direction, so that the drive of the auxiliary units takes place at higher crankshaft speeds by means of the small pulley 24; An adapted, uniform operation of the ancillaries, which better meets their operating ranges, is achieved.

Mit Figur 3 ist eine Antriebseinrichtung 38 im Betrieb mit Nebenaggregaten 35, 41, 42 gezeigt. Die zur hier nicht dargestellten Kurbelwelle einer Brennkraftmaschine koaxial angeordnete Antriebseinrichtung 38, wie sie im Detail mit Figur 2 gezeigt und beschrieben ist, wird von der Kurbelwelle in Pfeilrichtung angetrieben. Die kleinere Riemenscheibe, welche brennkraftmaschinenseitig angeordnet ist, bildet zusammen mit dem Antriebsriemen 39b die Riemenebene, während die große Riemenscheibe, welche auf der der Brennkraftmaschine abgewandten Seite angeordnet ist, zusammen mit dem Schaltriemen 39a die Schaltebene bildet.FIG. 3 shows a drive device 38 in operation with ancillary units 35, 41, 42 shown. The crankshaft of an internal combustion engine, not shown here Coaxially arranged drive means 38, as shown in detail with Figure 2 and is driven by the crankshaft in the arrow direction. The smaller pulley, which is arranged on the engine side forms together with the drive belt 39b the belt plane, while the large Pulley, which on the side facing away from the engine is arranged, together with the shift belt 39a forms the switching plane.

Im unteren Drehzahlbereich der Brennkraftmaschine erfolgt der Antrieb in der Schaltebene über eine auf der Welle einer Lenkhilfpumpe 41 angeordneten Riemenscheibe 40a, welche zusammen mit der Riemenscheibe 30 eine erste Übersetzungsstufe bildet; der Kraftfluss erfolgt weiterhin über eine koaxial zur Riemenscheibe 40a, ebenfalls auf der Lenkhilfpumpenwelle angeordneten Riemenscheibe 40b in der Schaltebene, wobei der Riemen 39b der Umlaufrichtung folgend eine Wasserpumpe 35 und einen Generator 42 antreibt. Die Riemen 39a, 39b werden jeweils mittels. Spannrollen 36, 37 unter Spannung gehalten.In the lower speed range of the internal combustion engine, the drive takes place in the Switching plane arranged on a on the shaft of a power steering pump 41 Pulley 40 a, which together with the pulley 30 a first Translation stage forms; The power flow continues via a coaxial to Pulley 40a, also arranged on the power steering pump shaft Pulley 40b in the switching plane, the belt 39b of the direction of rotation following a water pump 35 and a generator 42 drives. The belts 39a, 39b are each using. Tension rollers 36, 37 held under tension.

Im oberen Drehzahlbereich der Brennkraftmaschine erfolgt der Antrieb der Nebenaggregate bei geöffneter Magnetkupplung direkt in der Antriebsebene mittels der kleinen Riemenscheibe der Antriebseinrichtung 38, welche mit der Riemenscheibe 40b der Lenkhilfpumpe 41 eine zweite Übersetzungsstufe bildet.In the upper speed range of the internal combustion engine, the drive is the Auxiliary units with open magnetic coupling directly in the drive level by means of the small pulley of the drive device 38, which with the Pulley 40b of the power steering pump 41 forms a second gear ratio.

Gemäß eines weiteren Ausführungsbeispieles sind zweckmäßigerweise die Riemenscheiben, welche mit den Riemenscheiben 24, 30 der Antriebseinrichtung 38 die Übersetzungsstufen bilden, nicht der Lenkhilfpumpe 41, sondern einem anderen Nebenaggregat wie Wasserpumpe 35 oder Generator 42 zugeordnet.According to a further embodiment, the expediently Pulleys, which with the pulleys 24, 30 of the drive device 38 form the gear ratios, not the power steering pump 41, but a associated with other accessory such as water pump 35 or generator 42.

Im vorliegenden Ausführungsbeispiel ist die erste Übersetzung für den unteren Drehzahlbereich der Brennkraftmaschine i1 ≈ 1,8 bis 2,1, insbesondere ca. 1,95, die zweite Übersetzung für den oberen Drehzahlbereich der Brennkraftmaschine beträgt i1 ≈ 0,9 bis 1,3, insbesondere ca. 1,06. Hieraus ergibt sich ein Verhältnis der Beiden Übersetzungen zueinander von 4 bis 0,7, insbesondere 0,5 bis 0,6. Die Grenze zwischen oberem und unterem Drehzahlbereich der Brennkraftmaschine liegt vorliegend oberhalb 1100 min-1, vorzugsweise bei 1400 - 2000 min-1, insbesondere bei ca. 1500 min-1. Gegebenenfalls ist es zweckmäßig, wenn .die. Umschaltung hysteresebehaftet ist, so dass ein Umschalten abhängig von der Schaltrichtung bei unterschiedlichen Drehzahlen erfolgt; die Hysterese bewegt sich im Bereich von 50 bis 200 min-1, insbesondere beträgt sie ca. 100 min-1.In the present embodiment, the first ratio for the lower speed range of the internal combustion engine i 1 ≈ 1.8 to 2.1, in particular about 1.95, the second ratio for the upper speed range of the internal combustion engine is i 1 ≈ 0.9 to 1, 3, in particular about 1.06. This results in a ratio of the two translations to each other from 4 to 0.7, in particular 0.5 to 0.6. The boundary between the upper and lower speed range of the internal combustion engine is present above 1100 min -1, preferably at 1400 to 2000 min -1, in particular at approximately 1500 min -1. It may be appropriate if .the. Switching is hysteresis, so that switching takes place depending on the switching direction at different speeds; the hysteresis is in the range of 50 to 200 min -1 , in particular it is about 100 min -1 .

Mit der erfindungsgemäßen Anordnung wird eine Vielzahl von Vorteilen wie ein größerer Freiheitsgrad bei der Drehzahlauslegung der Nebenaggregate, eine deutliche Leerlaufabsenkung, ein niedrigerer Kraftstoffverbrauch, ein Anstieg der Nennleistung aufgrund niedrigerer Leistungsaufnahme der Nebenaggregate sowie eine Verbesserung der Prestigebeschleunigungswerte aufgrund niedrigeren Trägheitsmoments des Gesamtriementriebs erzielt. Ebenfalls hervorzuheben ist die Verwendung kleinerer Aggregate, wodurch entscheidende Bauraumvorteile erreicht werden.With the arrangement according to the invention a number of advantages such as a greater degree of freedom in the speed design of the ancillaries, a clear idling, lower fuel consumption, an increase in Rated power due to lower power consumption of the ancillaries as well an improvement in the prestige acceleration values due to lower Moment of inertia of the overall belt drive achieved. Also to be highlighted is the Use of smaller units, which achieves decisive space advantages become.

Claims (7)

  1. A device (33) for driving auxiliary units with two different transmission ratios, comprising
    on the input side: an input part (29) connected to the engine crankshaft by screws (21),
    on the output side: two drive pulleys (24, 30) differing in diameter for driving the auxiliary units and
    a gear-shift unit comprising a magnetic clutch (29, 31) and an overrunning clutch (23) between the input part (20) and the drive pulleys (24, 30), wherein
    the larger drive pulley (30) is associated with the magnetic clutch (29, 31) and the smaller drive pulley (24) is associated with the freewheel or overrunning clutch (23) and
    at low crankshaft speeds the auxiliary units are driven by the larger drive pulley (30) and at high crankshaft speeds the auxiliary units are driven by the smaller drive pulley (24),
    characterised in that
    the input part (20) comprises a flange portion and a shaft portion and
    the smaller drive pulley (24) is disposed on the flange portion of the input part (20) connected to the crankshaft.
  2. A device according to claim 1, characterised in that the screws (21) are disposed radially inside the bearings (22a, 22b).
  3. A device according to any of the preceding claims, characterised in that the gear-shift unit is incorporated in the drive pulleys (24, 30).
  4. A device according to claim 3, characterised in that the clutch magnet (31) is incorporated in the large drive wheel (30) and the freewheel (23) is incorporated in the small drive wheel (24).
  5. A device according to claim 3 or 4, characterised in that the drive is via the small drive pulley (24) when the magnetic clutch is disengaged and the large drive pulley (30) is idle, and the drive is via the large drive pulley (30) when the magnetic clutch is engaged and the freewheel (23) is operative between the large and the small drive pulley.
  6. A device according to any of the preceding claims, wherein the large drive pulley and a first additional pulley constitute a first transmission stage and the small drive pulley and a second additional pulley constitute a second transmission stage, characterised in that the transmission ratio between the second and the first stage is 0.4 to 0.7, especially 0.5 to 0.6.
  7. A device according to any of the preceding claims, characterised in that a change between the transmission stages occurs at a crankshaft speed of 1100 to 2000 min-1, especially 1400 to 1600 min-1.
EP02790363A 2001-12-15 2002-11-13 Variable belt drive for accessories Expired - Lifetime EP1454043B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2001161700 DE10161700A1 (en) 2001-12-15 2001-12-15 Variable overhead belt drive has switching module consisting of magnetic coupling and overtaking freewheel between its drive input and drive output
DE10161700 2001-12-15
PCT/EP2002/012674 WO2003052247A1 (en) 2001-12-15 2002-11-13 Variable belt drive for accessories

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Publication Number Publication Date
EP1454043A1 EP1454043A1 (en) 2004-09-08
EP1454043B1 true EP1454043B1 (en) 2005-09-14

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EP02790363A Expired - Lifetime EP1454043B1 (en) 2001-12-15 2002-11-13 Variable belt drive for accessories

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EP (1) EP1454043B1 (en)
DE (2) DE10161700A1 (en)
WO (1) WO2003052247A1 (en)

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DE102020104248B3 (en) * 2020-02-18 2021-01-21 Audi Aktiengesellschaft Pulley assembly
WO2021008829A1 (en) 2019-07-16 2021-01-21 Audi Ag Belt pulley assembly
WO2021008757A1 (en) 2019-07-16 2021-01-21 Audi Ag Belt pulley assembly
WO2021008759A1 (en) 2019-07-16 2021-01-21 Audi Ag Belt pulley assembly

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DE102011010284B4 (en) * 2011-02-03 2019-12-24 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Belt drive arrangement for an auxiliary unit of a motor vehicle and motor vehicle with such a belt drive arrangement
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DE102019210502B3 (en) * 2019-07-16 2020-12-24 Audi Ag Pulley assembly
WO2021008829A1 (en) 2019-07-16 2021-01-21 Audi Ag Belt pulley assembly
DE102019210501A1 (en) * 2019-07-16 2021-01-21 Audi Ag Pulley assembly
WO2021008757A1 (en) 2019-07-16 2021-01-21 Audi Ag Belt pulley assembly
WO2021008759A1 (en) 2019-07-16 2021-01-21 Audi Ag Belt pulley assembly
WO2021008830A1 (en) 2019-07-16 2021-01-21 Audi Ag Belt pulley assembly
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DE102019210501B4 (en) 2019-07-16 2021-09-30 Audi Ag Pulley assembly
DE102020104248B3 (en) * 2020-02-18 2021-01-21 Audi Aktiengesellschaft Pulley assembly

Also Published As

Publication number Publication date
WO2003052247A1 (en) 2003-06-26
DE10161700A1 (en) 2003-06-18
EP1454043A1 (en) 2004-09-08
DE50204295D1 (en) 2005-10-20

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