EP2427673A1 - Ensemble tendeur de courroie - Google Patents

Ensemble tendeur de courroie

Info

Publication number
EP2427673A1
EP2427673A1 EP10718930A EP10718930A EP2427673A1 EP 2427673 A1 EP2427673 A1 EP 2427673A1 EP 10718930 A EP10718930 A EP 10718930A EP 10718930 A EP10718930 A EP 10718930A EP 2427673 A1 EP2427673 A1 EP 2427673A1
Authority
EP
European Patent Office
Prior art keywords
friction
belt tensioning
tensioning unit
segment
base part
Prior art date
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.)
Withdrawn
Application number
EP10718930A
Other languages
German (de)
English (en)
Inventor
Bernd Hartmann
Thorsten Liebel
Johann Singer
Christine Thomann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and 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 and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2427673A1 publication Critical patent/EP2427673A1/fr
Withdrawn legal-status Critical Current

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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1209—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means
    • F16H7/1218—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means of the dry friction type
    • 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
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/081—Torsion 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0889—Path of movement of the finally actuated member
    • F16H2007/0893—Circular path

Definitions

  • the invention relates to a belt tensioning unit, in particular for a belt pulley plane of an internal combustion engine, comprising a rotatably fixed base part and a relative to this against the action of an energy storage limited rotatable clamping part, wherein between the base part and the rotary part, a friction device is effective.
  • Typical embodiments of generic belt tensioner have a clamping part with a relation to a belt-biased idler.
  • the clamping part is against the action of an energy storage pivotable relative to the fixedly arranged on a housing of the internal combustion engine base rotatably limited.
  • DE 10 2004 047 422 A1 discloses a generic belt tensioning device with a base part and a tensioning part.
  • the effective between them during rotation energy storage is formed by a torsion spring, which is clamped at one end in the base part and at the other end in the clamping part, so that widens in a relative rotation in a rotational direction, the torsion spring and the friction means applied with a normal force.
  • the friction device is formed in two parts from a one-piece, one-sided open friction ring which forms a frictional engagement with a friction surface of the base part when acted upon by the torsion spring widening the open ends. Between the torsion spring and the friction ring, the second part is arranged in the form of a band spring.
  • WO 03/098971 A1 discloses a damping device for a belt tensioning device with a friction device, in which two ring segments divided over the circumference are proposed, which are inherently rigid with respect to their diameter by a solid carrier part and do not permit adaptation of the diameter.
  • An adaptation to the wear of the friction lining is effected by means of an articulated connection between the two opposite ring segments, which does not allow kinematically symmetrical wear compensation, so that the friction linings of the ring segments are worn unevenly and a corresponding reserve of wear for the preferably worn area must be provided.
  • the friction device with a comparatively thin design of the friction linings over life a uniform frictional engagement formed with the provided to the friction linings friction surface.
  • the friction device should be easy to produce and have a low space requirement.
  • this object is achieved by a belt tensioning unit, in particular for a pulley plane of an internal combustion engine with a rotatably mounted base part and a relative to the action of an energy storage limited rotatable clamping part, wherein between the base part and the clamping part at a relative rotation between the base part and clamping part of the energy storage is arranged radially outwardly against a friction surface biased friction means radially between the energy storage and the friction surface.
  • the friction device is formed from a arranged on the friction surface, niksegmentförmi- gem and elastic with respect to its diameter formed friction segment.
  • This structure also allows uniform loading of the entire circumference of the Reibsegementes by the outer circumference of the preferably configured as a torsion spring energy storage, so that over the inner periphery of the friction segment, a uniformly distributed normal force to form the frictional engagement with the friction surface is achieved.
  • the friction surface is provided on an inner circumferential surface of the base part.
  • a rotation of the friction segment relative to the friction surface is forced by the friction segment is taken from the clamping part.
  • a frictional engagement can to be towed by taking a ride with play.
  • a corresponding friction surface forming a frictional engagement with the friction segment may be provided on the tensioning part, said friction surface being suspended in the base part in order to achieve sliding friction when the tensioning part is rotated relative to the base part.
  • the friction segment is formed from a carrier part and a friction lining fixed thereon.
  • the friction linings can be applied to the carrier part in a form-fitting and / or material-locking manner, in which it is riveted, latched or positively molded, for example, by molding or gluing.
  • different materials of the friction lining which may be formed of different plastics with different coefficients of friction and hardness, wherein plastics having lubricating properties such as perfluorocarbons may be used, which may also be embedded in a stable matrix or can form with these copolymers.
  • the friction components forming such a friction lining are freely selectable for forming a modular construction kit with the carrier parts, which in turn are structurally adapted to the conditions of use in the belt tensioning unit.
  • the carrier parts are for example punched from thin spring steel and pre-bent to the insert diameter, wherein, depending on the desired formation of the friction engagement with the friction surface, the carrier parts can have a larger, approximately the same or smaller diameter or radius than the friction surface.
  • a biased frictional engagement can be adjusted when the diameter of the support member is selected to be larger than the diameter of the friction surface, while at smaller diameters frictional engagement is at least completely made only when the torsion spring on a corresponding normal force the friction segment exercises.
  • the carrier parts can be brought to the desired diameter under plastic deformation before installation. It is understood that the carrier parts are first prefabricated from soft sheet material and then hardened. te method for obtaining elastic properties can be subjected.
  • the support member For rotational driving of the friction segment by the clamping part or the base part in the arrangement of the friction surface on the clamping part can be issued from the support member at least one, preferably a single with respect to the arc of a friction segment central tab of the sheet material of the support member.
  • This at least one tab engages in a recess provided in the base part or clamping part, so that a corresponding rotational drive of the friction segment takes place.
  • a tab is issued radially inward.
  • the support parts made of plastic, preferably made of reinforced plastic.
  • Such carrier parts are preferably produced by means of a plastic injection molding process, wherein the at least one tab for driving the friction segment is provided tool falling.
  • the friction lining may already be applied or sprayed on in a two-component or multi-component process, so that the friction segments are completely made of at least two plastic components - one preferably made of reinforced plastic to form the carrier part and another on the desired Friction value set component - tool falling and one-piece are made.
  • the structure and the choice of material of the friction surface are taken into account in addition to the design of the friction lining.
  • the use of metal surfaces for example unprocessed aluminum die-cast surfaces, has proved to be particularly advantageous.
  • the carrier parts of thin sheet metal or thin reinforced plastic or the like, the heat capacity of the friction segment can be minimized, so that heat quickly to the surrounding Parts, for example, the base part, is dissipated and no heat accumulation is formed in the carrier parts, which can adversely affect the life of the friction linings, so that a total of a longer life of the Reibsegmente can be expected.
  • the one-piece friction segment is supported by two diametrical regions arranged on the circular friction surface, which preferably occupy an arc with an angle between 90 ° and 150 °.
  • a diameter of the friction segment between 35 mm and 70 mm has proved to be advantageous.
  • the tabs of the friction segment can be configured according to the installation geometry. It has been found to be advantageous if the tabs are provided centrally between the two end faces of the carrier parts, since in this way the friction segment of a belt tensioning unit can be formed.
  • a friction device which is formed from two mutually symmetrical, arranged on the friction surface opposite, circular segment-shaped and elastic with respect to their diameter formed friction segments.
  • a preferred embodiment provides that the two circular segment-shaped friction segments are designed as identical parts.
  • two diametrical friction segments arranged on the circular friction surface are provided, which preferably occupy an arc with an angle between 90 ° and 150 °.
  • a diameter of the friction segments between 35 mm and 70 mm has proven to be advantageous.
  • the tabs of the friction segments can be configured according to the installation geometry. It has been found to be advantageous if the tabs are provided centrally between the two end faces of the support members, as in this way the two friction segments of a belt tensioning unit as equal parts can be trained so that lower logistics and tool costs can be achieved.
  • Friction device comprising friction segment
  • Figures 2a to 2d different views of a friction segment with a support member made of sheet metal and a friction lining.
  • Figure 1 shows a belt tensioning unit 1 for a traction mechanism drive with a fixed, for example, attached to a housing of an internal combustion engine base 2 and limited to this about the axis of rotation 1 a displaceable clamping part 3, here as a pivot arm 4, which rotatably receives the tension roller 5 formed is.
  • the tension roller 5 engages in the belt, for example, a belt, and adjusts its bias and dampens vibrations registered in the traction mechanism by pivoting the pivot arm 4.
  • a force compensating for the tension of the belt is inserted between the base part 2 and the arm 4 is applied by a tensioned between these energy storage 6.
  • torsion spring 7 which is braced at its one end rotationally connected to the base part 2 and at its other end rotationally connected to the pivot arm 4 by means of driving devices, wherein in the figure 1, only the axially in Torsion spring 7 integrally formed driving device 11 of the pivoting arm 4 can be seen.
  • a friction device 8 is connected is formed of a friction segments 9 and provided on the inner circumference of the base part 2 complementarily shaped friction surface 10.
  • the friction segments 9 is taken at a relative rotation between the pivot arm 4 and base part 2 of the swing arm 4 by means of a further provided on the pivot arm 4 driving device 12, which may be formed in a simpler design of the driving device 11 for the coil spring taken.
  • the tab 13 can be entrained in circumferential direction by the entrainment device 12, wherein the tab 13 engages axially in a driving device 12 designed as a recess and is thereby entrained in both directions of rotation.
  • the entrainment device can be designed as a cam, around which the tab 13 is folded.
  • the tab 13 may be prefolded and pushed onto the cam during assembly.
  • the sides of the tab 13 may be bent during assembly.
  • an undercut may be provided on the cam, which engages behind a portion of the tab to form a captive or axial fixation of the friction segment 9 on the base part 2 by the tab 13 is pre-bent or locks.
  • the friction segment 9 can be installed under prestress or with a slight clearance relative to the friction surface 10.
  • one or more windings 14 of the torsion spring 7 abut against the inner circumference of the friction segment 9 and determine by acting on this normal force of the torsion spring 7 with the rotation angle of the pivot arm 4 increasing friction torque between the friction segment 9 and the friction surface 10, ie between the pivot arm 4 and the base part of the second
  • the friction segment 9 includes two diametrically opposite to the friction surface 10, formed as a friction lining 16 areas or zones. Due to special loads and requirements, a support member 15 connects the friction linings 16, to form a one-piece friction segment 9.
  • the support member 15 is made of a mechanically strong material in which neither the torsion spring 7 nor the driving device 12 of the pivot arm 4 can dig.
  • the support member 15 may be made of spring steel or reinforced plastic.
  • the support member 15 is designed to minimize the heat storage capacity and the required space as viewed in the radial direction shell member.
  • the friction lining 16 is designed to set an optimized coefficient of friction with the friction surface 10 and is therefore made of soft plastic such as polyamide or other friction material mechanically due to the support of the support member 15 does not have to withstand the normal forces of the torsion springs 7.
  • Figures 2a to 2d show the friction segment 9 as a single part in different views.
  • the friction segment 9 is bent from the support member 15 made of a spring steel sheet predetermined on an insert diameter, from which the tab 13 is issued.
  • the tab may be issued from a closed window, so that at both end faces of the support member 15, a web 17 for additional stabilization of the support member remains, whereby the support member is additionally stabilized.
  • the tab 13 can be made multi-layer in further embodiments by flipping these cutouts and thus strengthened.
  • the friction lining 16 is applied, for example glued or positively connected in a manner not shown, for example by means of a latch with this.

Landscapes

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

Abstract

L'invention concerne un ensemble tendeur de courroie (1) comprenant un élément de base (2) et un élément tendeur (3), monté à l'opposé de l'élément de base, entraîné en rotation de manière limitée, à l'encontre de l'action d'un accumulateur d'énergie (6); entre l'élément de base (2) et l'élément tendeur (3), un dispositif à friction (8), précontraint par l'accumulateur d'énergie (6), à l'encontre d'une surface de friction (10) radialement vers l'extérieur, lors d'une rotation relative entre l'élément de base (2) et l'élément tendeur (3), est disposé radialement entre l'accumulateur d'énergie (6) et la surface de friction (10). En vue d'obtenir un dispositif à friction (8) simple et amélioré quant à ses propriétés de friction, l'invention est caractérisée en ce que le dispositif à friction (8) est configuré en tant que segment de friction (9) qui comprend deux surfaces de friction disposées symétriquement entre elles, et opposées à la surface de friction (10).
EP10718930A 2009-05-09 2010-04-26 Ensemble tendeur de courroie Withdrawn EP2427673A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009020589A DE102009020589A1 (de) 2009-05-09 2009-05-09 Riemenspanneinheit
PCT/EP2010/055500 WO2010130553A1 (fr) 2009-05-09 2010-04-26 Ensemble tendeur de courroie

Publications (1)

Publication Number Publication Date
EP2427673A1 true EP2427673A1 (fr) 2012-03-14

Family

ID=42286682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10718930A Withdrawn EP2427673A1 (fr) 2009-05-09 2010-04-26 Ensemble tendeur de courroie

Country Status (5)

Country Link
US (1) US20120028744A1 (fr)
EP (1) EP2427673A1 (fr)
CN (1) CN102414477A (fr)
DE (1) DE102009020589A1 (fr)
WO (1) WO2010130553A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010019066A1 (de) * 2010-05-03 2011-11-03 Schaeffler Technologies Gmbh & Co. Kg Riemenspanner
DE102011085546A1 (de) 2010-12-08 2012-06-14 Schaeffler Technologies Gmbh & Co. Kg Zugmittelspanner
DE102011082330B4 (de) * 2011-08-12 2014-08-07 Schaeffler Technologies Gmbh & Co. Kg Spannvorrichtung für einen Riementrieb und Elektromaschine mit einer derartigen Spannvorrichtung
DE102011084680B3 (de) * 2011-10-18 2012-11-22 Schaeffler Technologies AG & Co. KG Spannvorrichtung für einen Riementrieb und Elektromaschine mit einer derartigen Spannvorrichtung
AU2012327617B2 (en) * 2011-10-29 2016-02-11 The Gates Corporation Tensioner
DE102012201720A1 (de) 2012-02-06 2013-08-08 Schaeffler Technologies AG & Co. KG Riemenspanner
EP2938905B1 (fr) * 2012-12-26 2018-10-17 Litens Automotive Partnership Ensemble tendeur orbital
DE112014002423B4 (de) 2013-05-14 2023-01-26 Litens Automotive Partnership Spannvorrichtung mit verbesserter Dämpfung
CN203770558U (zh) * 2014-03-25 2014-08-13 宁波丰茂远东橡胶有限公司 一种发动机用大阻尼低衰减张紧器
DE102014206716A1 (de) * 2014-04-08 2015-10-08 Muhr Und Bender Kg Riemenspannvorrichtung
US10520066B2 (en) 2014-06-26 2019-12-31 Litens Automotive Partnership Orbital tensioner assembly
US9982760B2 (en) * 2015-02-12 2018-05-29 Ningbo Fengmao Far-East Rubber Co., Ltd. Tensioner for engine with large and stable damping and minimum deflection of shaft
DE102015222203B4 (de) 2015-11-11 2020-03-12 Schaeffler Technologies AG & Co. KG Spielfreie Pendellagerung am Entkopplungsspanner
JP6527550B2 (ja) 2016-06-27 2019-06-05 三ツ星ベルト株式会社 補機駆動ベルトシステムに備わるオートテンショナ
US10683914B2 (en) * 2018-02-14 2020-06-16 Gates Corporation Tensioner

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DE102007031298A1 (de) * 2007-07-05 2009-01-08 Schaeffler Kg Dämpfungsvorrichtung eines mechanischen Spannsystems für einen Zugmitteltrieb

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DE102006057005A1 (de) * 2006-12-02 2008-06-05 Schaeffler Kg Spann- und Dämpfungsvorrichtung für Zugmitteltriebe
DE102007031298A1 (de) * 2007-07-05 2009-01-08 Schaeffler Kg Dämpfungsvorrichtung eines mechanischen Spannsystems für einen Zugmitteltrieb

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Title
See also references of WO2010130553A1 *

Also Published As

Publication number Publication date
CN102414477A (zh) 2012-04-11
WO2010130553A1 (fr) 2010-11-18
DE102009020589A1 (de) 2010-11-11
US20120028744A1 (en) 2012-02-02

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