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WO2017206993A1 - Dispositif de découplage à poulie à courroie - Google Patents

Dispositif de découplage à poulie à courroie Download PDF

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Publication number
WO2017206993A1
WO2017206993A1 PCT/DE2017/100464 DE2017100464W WO2017206993A1 WO 2017206993 A1 WO2017206993 A1 WO 2017206993A1 DE 2017100464 W DE2017100464 W DE 2017100464W WO 2017206993 A1 WO2017206993 A1 WO 2017206993A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulley
decoupler
hub
belt
loop
Prior art date
Application number
PCT/DE2017/100464
Other languages
German (de)
English (en)
Inventor
Christian Hauck
Jens Schäfer
Original Assignee
Schaeffler Technologies AG & Co. KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2017206993A1 publication Critical patent/WO2017206993A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/20—Freewheels or freewheel clutches with expandable or contractable clamping ring or band
    • F16D41/206—Freewheels or freewheel clutches with expandable or contractable clamping ring or band having axially adjacent coils, e.g. helical wrap-springs
    • 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
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
    • F16D3/12—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted for accumulation of energy to absorb shocks or vibration
    • 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
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/72—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members with axially-spaced attachments to the coupling 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
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
    • F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
    • F16D7/022—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with a helical band or equivalent member co-operating with a cylindrical torque limiting coupling surface

Definitions

  • the invention relates to a pulley decoupler for driving torque transmission between the belt of a starter-belt drive and the starter generator.
  • the pulley decoupler includes:
  • a hub to be mounted on the generator shaft of the starter generator, a decoupler spring which, when the starter generator is driven, transmits the drive torque of the belt from the pulley to the hub,
  • Pulley decouplers (referred to in the English-language literature as ' decoupler ' or ' compensator ' ) compensate torsional vibrations and non-uniformities introduced by the crankshaft of an internal combustion engine into its accessory belt drive, and are typically arranged on the generator. If the generator is a starter generator which drives the internal combustion engine in the electromotive operation for the purpose of starting or boosting via the belt drive, the usual overrunning of the generator shaft during generator freewheels is not possible without further ado.
  • the pulley decoupler must lock in this relative direction of rotation in order to transmit the drive torque generated by the starter generator via the hub and pulley on the belt can.
  • a generic pulley decoupler is known from EP 2 010 792 B1.
  • the lock which transmits the drive torque from the hub to the belt pulley when the starter generator is driven is formed there by circumferentially fixed end stops which limit the rotatability of the hub relative to the belt pulley.
  • a major disadvantage of the hard stops is the high noise, which is stronger with the velocity of the hub against the pulley.
  • decoupler spring is a helical torsion spring which can be loaded in both directions of rotation, ie in the opening and in the closing direction. In one direction of rotation, the spring transmits the drive torque originating from the belt. pelting on the starter generator, and in the other twisting direction, the spring acts as its diameter changing looping belt, which either opens or contracts due to the starting or boosting torque, while the pulley rotates torsionally stiff against the hub.
  • a disadvantage of this construction is the considerable difficulty in satisfactorily realizing the different functions of the spring and the sling in the same component.
  • the present invention seeks to provide a belt pulley decoupler of the type mentioned with an alternative embodiment of the lock.
  • the lock should be formed by a Schlingband which is connected in the drive torque flow between the pulley and the hub parallel to the decoupling spring and when driving starter generator, the pulley torsionally stiff against the hub.
  • the sling provides a comparatively smooth locking action of the pulley with respect to the hub as the starter generator begins to transmit the drive torque from the hub to the pulley.
  • the lock formed as a separate Schlingband a respective optimal, since each other largely independent design of decoupler spring and Schlingband.
  • the Schlingband over (circumferential) positive engagement of the Schlingbandenden with the pulley on the one hand and the hub on the other hand in engagement.
  • the form-fitting of the Schlingbandenden can be designed so that it acts either unidirectional in only one or bidirectional in both directions of relative rotation of pulley to hub.
  • the sling band in the axial direction of the Riemenusionnentkopplers have angled Schlingbandenden that engage in recesses of the pulley and the hub.
  • the Schlingbandenden can be shaped as circumferentially deviating from the circular leg, which engage positively in corresponding receptacles on the part of the pulley and the hub.
  • the version with unidirectional or bi-directional positive locking depends above all on the installation conditions of the sling band in the pulley decoupler: a. ) when the looping belt in unloaded condition already in frictional engagement with the
  • Friction contact partners located on the hub and on the pulley then the form fit twisted the driven belt starter generator expediently against its Schlingraum to reliably prevent unwanted locking of the sling at the decoupling relative rotations of the driving pulley relative to the hub.
  • An interlocking action which also acts in the opposite direction of relative rotation, is optional and supports the blocking process of the sling band when the starter generator is driving. b. ) When the sling band in unloaded condition (with radial play) is frictionally engaged with its Reibtitlepartnern on the hub and on the pulley, then twisting the Schlingband at driving starter generator expediently in the Schlingraum to the Schlingband reliably in the leading to the locking operation frictional engagement to bring with its Reibtitlepartnern.
  • An interlocking action which also acts in the opposite direction of relative rotation is optional and increases the safety of the sling band against unintentional locking of the sling band during the decoupling relative rotations of the driving belt pulley relative to the hub.
  • the wrap-around form-fit allows the wrapper to be biased in the cinching direction subsequent to its axial mounting to relax the torque-free transition angle of the pulley decoupler during its load changes between the driven starter generator - the decoupler spring is just about fully or fully relaxed and the wrapper is not yet locked - and driving starter generator - the looping belt begins to lock - to minimize.
  • a comparatively large transition angle may be required in said load change region of the pulley decoupler.
  • the decoupler spring is preferably a helical torsion spring extending in the axial direction of the pulley decoupler with limb-free spring ends which, when driven Starter generator transferred the drive torque from the level of an axially ramped spring plate of the pulley to the level of an axially ramped spring plate of the hub.
  • the torque curve during the locking process of the sling band can be further influenced by the fact that the sling band has a different diameter than the sling band ends in a middle section which snaps against the pulley and against the hub, the diameter of the middle section being either
  • the winding body of the Schlingbands has a bulbous shape and in case b.) A centrally constricted shape.
  • the successive engagement of the sling band can alternatively or additionally also be achieved by a non-cylindrical shaping of the friction contact partners.
  • the radial clearance difference between the narrowest point between the sling band and the friction contact partner and the widest point between the sling band and the friction contact partner should be up to about 1 mm.
  • FIG. 1 shows the first pulley decoupler in a perspective longitudinal section
  • FIG. 2 shows the first pulley decoupler exploded in perspective;
  • FIG. 4 shows the pulley of the first pulley decoupler in a perspective partial view;
  • FIG. 5 shows the hub of the first pulley decoupler in a perspective detail view
  • FIG. 6 is a schematic diagram of the torque detection of the pulley decouplers
  • FIG. 7 shows the second pulley decoupler in a perspective longitudinal section
  • FIG. 8 shows the looping belt of the second pulley decoupler in a perspective single part illustration.
  • Figures 1 and 2 show the first pulley decoupler 1 in longitudinal section or as an explosion.
  • a hollow cylindrical pulley 2 whose belt-wrapped outer jacket 3 is profiled according to the poly-V-shape of the belt, is driven by the belt in the direction of rotation shown in FIG.
  • the pulley 2 is rotatably mounted on a hub 4, which is bolted to the generator shaft of a starter generator.
  • the hub 4 in the middle section 5, an unillustrated internal thread and the generator distant, front end portion of a réelleviel leopard 6 as engagement contour for the screwing.
  • the bearing of the pulley 2 on the hub 4 takes place at the generator end radially and axially by means of a rolling bearing 7 and at the far end generator radially by means of a sliding bearing 8.
  • the rolling bearing 7 is a single-row and sealed on both sides ball bearing.
  • the sliding bearing 8 is a slotted radial bearing ring made of polyamide, which is in direct sliding contact with the inner periphery of the pulley 2.
  • the pulley 4 has at the far end of the generator a circumferential groove 9, in which after the screwing of the pulley decoupler 1 on the generator shaft, a protective cap 10 is snapped.
  • the winding components of the decoupler spring 1 1 designed as a helical torsion spring and of the sling band 12 extend in and in the present case concentrically to the axial direction of the pulley decoupler 1, wherein in this first Embodiment, the decoupling spring 1 1, the looping belt 12 encloses.
  • the winding body of the sling 12 In the locked state, the winding body of the sling 12 is constricted and is located with its inner circumference in torque transmitting static friction contact with Reib.partnern the pulley 2 and the hub 4.
  • the Reibnesspartnern is the outer shell 13 of a cylindrical projection 14 of the pulley 2 on the one hand and an outer jacket 15 of the hub 4 on the other.
  • the decoupler 11 is located with legless spring ends 16 and 17 on a spring plate 18 of the pulley 2 on the one hand and a spring plate 19 of the hub 4 on the other.
  • Both spring plates 18, 19 rise axially in a ramp shape, wherein the spring ends 16, 17 are clamped at the end face between the steps 20 and 21 formed by the axial ramp shape of the spring plates 18, 19.
  • the looping belt 12 is connected in the drive torque flow between the pulley 2 and the hub 4 parallel to the decoupler spring 1 1 and has looping belt ends 22 and 23 which are angled in the axial direction of the pulley decoupler 1 and positively in recesses 24 and 25 of the pulley 2 and the hub 4th intervention.
  • Both recesses 24, 25 are settings in the spring plates 18, 19 at the base of the respective step 20, 21, wherein the hub-side recess 25 is also visible in FIG.
  • the inner diameter of the Schlingbands 12 is greater than the outer diameter of the cylindrical projection 14 and the outer diameter of the outer jacket 15 in order to mount the Schlingband 12 axially low-force on the Reibumblepartner.
  • the circumferential relative positioning of the loop tape ends 22, 23, the recesses 24, 25, the steps 20, 21 and the spring ends 16, 17 is such that the assembled loop tape 12 is biased in the reverse direction to reduce the radial clearance against the Reibtitlepartnern and sometimes. to eliminate.
  • the associated torques are shown schematically in FIG. 6, with the solid line showing the torque of the decoupler spring 11 and the dashed line the torque of the sling 12 depending on the relative rotational angle of the belt pulley 2 to the hub 4.
  • the bias acting in the reverse direction of the sling 12 is recognizable at the offset of the torques with respect to the origin and causes negative relative rotation a substantially immediate onset blocking effect of the sling 12 when the starter generator begins in the transition to electromotive operation with the driving.
  • the thereby steeply sloping into the negative torque curve of the sling 12 is characteristic of its blocking effect, in which the pulley 2 is torsionally stiff against the hub 4.
  • the decoupler spring 1 1 is torque-free in this operating mode.
  • the pulley decoupler 1 When the starter generator is driven, the pulley decoupler 1 is in the operating range positive relative rotation angle. In this case, the torque of the decoupler spring 11 increases steeper due to their relatively high rigidity than the also widening in the opening direction Schlingband 12th
  • the positive connection between the pulley, hub and wrap band circumferentially unidirectional act. If on the one hand the unloaded Schlingband - as in the illustrated embodiment - is mounted with radial play against the Reibtitlepartnern, then acting in the opening direction (white) pair of forces according to Figure 3 can be omitted. Because in this case the risk of uncontrolled locking of the sling is small. On the other hand, if the unloaded Schlingband with little or in particular without radial play against the Reib mintpartnern is mounted, then acting in the closing direction (black) force pair according to Figure 3 can be omitted. Because in this case, the Schlingband already passes through the frictional contact in blocking engagement, so that can be dispensed with the bias of the Schlingbands in the closing direction.
  • the starter generator is in regenerative operation and is thus driven by the belt in the direction of rotation of Figure 1.
  • the drive motor is ment of the belt via outer casing 3 of the pulley 2 - stage 20 of the spring plate 18 of the pulley 2 - spring end 16 of the decoupler spring 1 1 - decoupler spring 1 1 - spring end 17 of the decoupler spring 1 1 - 21 stage of the spring plate 19 of the hub 4 - hub 4 on the Transfer generator shaft.
  • the elasticity of the decoupler spring 11 compensates for the transmission of the torsional vibrations of the belt to the generator shaft.
  • a lock due to an uncontrolled frictional engagement of the sling 12 is prevented by its widening generated in a form-fitting manner with respect to the Reib.partnern.
  • the starter generator is in electromotive operation and thus drives the belt also in the direction of rotation of Figure 1 at.
  • the drive torque of the generator shaft via hub 4 - outer casing 15 of the hub 4 - inner circumference of the locking Schlingbands 12 - cylindrical projection 14 of the pulley 2 - outer casing 3 of the pulley 2 is transmitted to the belt.
  • FIG. 7 shows the second exemplary embodiment of a pulley decoupler 1 ' according to the invention.
  • This differs with otherwise the same functionality of the previously discussed pulley decoupler 1 first by the radially reversed arrangement of looping belt 12 ' and decoupler spring 1 1 ' , which is enclosed in this case by the looping belt 12 ' .
  • the winding directions of the loop belt 12, 12 ' and the decoupler spring 11, 11 ' are the same in the first pulley decoupler 1 and the opposite in the second pulley decoupler 1 ' .
  • the winding body of the sling 12 ' is widened and located with its outer circumference in torque transmitting HaftreibungsAuth with the inner shell 26 in the pulley 2 ' pressed-in sleeve 27 on the one hand and with the inner shell 28 of a cylindrical projection 29 of the hub 4 ' on the other.
  • the sleeve 27 simplifies the production of the pulley 2 ' , which is accessible with a substantially constant inner diameter of a low-effort turning. Another difference is the non-cylindrical, bulbous shape of the
  • the axially changing radial clearance between the looping belt 12 ' and its Reibumblepartnern makes it possible to influence the torque curve at the onset of blocking effect of the sling 12 ' to the effect that the pulley decoupler 1 ' with a more or less large torque gradient "hard” or “gently” in the locked operating state passes.
  • the thus adapted torque characteristic can be realized in the first pulley decoupler 1 as well.
  • the Schlingband 12 would be constricted in the middle section 30 in diameter.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

L'invention concerne un dispositif de découplage à poulie à courroie (1, 1') destiné à transmettre un couple d'entraînement entre la courroie d'une transmission à courroie d'un générateur-démarreur et le générateur-démarreur. Le dispositif comprend : une poulie à courroie (2), un moyeu (4, 4') à fixer sur l'arbre du générateur-démarreur, un ressort de découplage (11, 11') qui, lorsque le générateur-démarreur est entraîné, transmet le couple d'entraînement de la courroie de la poulie à courroie sur le moyeu, et un bloqueur qui, lorsque le générateur-démarreur effectue un entraînement, transmet le couple d'entraînement de l'arbre du générateur du moyeu sur la poulie à courroie. Le bloqueur vise à être formé par une bande d'enroulement (12, 12') qui est montée dans le flux de couple d'entraînement entre la poulie à courroie et le moyeu parallèlement au ressort de découplage et, lorsque le générateur-démarreur effectue un entraînement, la poulie à courroie s'enroule de façon rigide en torsion contre le moyeu.
PCT/DE2017/100464 2016-06-01 2017-05-31 Dispositif de découplage à poulie à courroie WO2017206993A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016209598.6 2016-06-01
DE102016209598.6A DE102016209598B4 (de) 2016-06-01 2016-06-01 Riemenscheibenentkoppler

Publications (1)

Publication Number Publication Date
WO2017206993A1 true WO2017206993A1 (fr) 2017-12-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2017/100464 WO2017206993A1 (fr) 2016-06-01 2017-05-31 Dispositif de découplage à poulie à courroie

Country Status (2)

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DE (1) DE102016209598B4 (fr)
WO (1) WO2017206993A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020001692A1 (fr) * 2018-06-25 2020-01-02 Schaeffler Technologies AG & Co. KG Dispositif de découplage à poulie
CN113348314A (zh) * 2019-01-09 2021-09-03 盖茨公司 隔离器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3812624A4 (fr) * 2018-06-25 2022-03-23 Mitsuboshi Belting Ltd. Structure de poulie, palier coulissant et procédé de production pour palier coulissant
JP6661044B2 (ja) 2018-06-25 2020-03-11 三ツ星ベルト株式会社 プーリ構造体、滑り軸受、及び、滑り軸受の製造方法
CN114466980B (zh) * 2019-10-01 2023-07-04 株式会社欧利生 双向转矩限制器
DE102020122175B3 (de) * 2020-08-25 2021-11-11 Schaeffler Technologies AG & Co. KG Riemenscheibenentkoppler
DE102021201025B4 (de) 2021-02-04 2023-08-03 Zf Friedrichshafen Ag Entkopplungseinheit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1730425B1 (fr) 2004-04-02 2008-03-19 Schaeffler KG Poulie a courroie
DE102009052611A1 (de) * 2009-11-10 2011-05-12 Schaeffler Technologies Gmbh & Co. Kg Riemenscheibenanordnung
US20140305765A1 (en) * 2013-04-11 2014-10-16 The Gates Corporation Isolator decoupler
EP2010792B1 (fr) 2006-04-26 2015-03-25 Litens Automotive Partnership Isolateur unidirectionnel pour dispositifs a couple eleve
US20150285366A1 (en) * 2014-04-08 2015-10-08 The Gates Corporation Isolating decoupler

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9441681B2 (en) 2012-04-18 2016-09-13 Litens Automotive Partnership Power transmitting device with overrunning decoupler
WO2015103697A1 (fr) 2014-01-10 2015-07-16 Litens Automotive Partnership Découpleur à capacité de roue libre et de démarrage à courroie

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1730425B1 (fr) 2004-04-02 2008-03-19 Schaeffler KG Poulie a courroie
EP2010792B1 (fr) 2006-04-26 2015-03-25 Litens Automotive Partnership Isolateur unidirectionnel pour dispositifs a couple eleve
DE102009052611A1 (de) * 2009-11-10 2011-05-12 Schaeffler Technologies Gmbh & Co. Kg Riemenscheibenanordnung
US20140305765A1 (en) * 2013-04-11 2014-10-16 The Gates Corporation Isolator decoupler
US20150285366A1 (en) * 2014-04-08 2015-10-08 The Gates Corporation Isolating decoupler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020001692A1 (fr) * 2018-06-25 2020-01-02 Schaeffler Technologies AG & Co. KG Dispositif de découplage à poulie
CN113348314A (zh) * 2019-01-09 2021-09-03 盖茨公司 隔离器

Also Published As

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