WO2016098052A1 - Tendeur comprenant un dispositif d'amortissement amélioré - Google Patents

Tendeur comprenant un dispositif d'amortissement amélioré Download PDF

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Publication number
WO2016098052A1
WO2016098052A1 PCT/IB2015/059738 IB2015059738W WO2016098052A1 WO 2016098052 A1 WO2016098052 A1 WO 2016098052A1 IB 2015059738 W IB2015059738 W IB 2015059738W WO 2016098052 A1 WO2016098052 A1 WO 2016098052A1
Authority
WO
WIPO (PCT)
Prior art keywords
damper
tensioner
tensioner according
pulleys
support
Prior art date
Application number
PCT/IB2015/059738
Other languages
English (en)
Other versions
WO2016098052A8 (fr
Inventor
Gianluca Cariccia
Antonino Cimino
Andrea Montani
Vincenzo DELL'OLIO
Original Assignee
Dayco Europe S.R.L.
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 Dayco Europe S.R.L. filed Critical Dayco Europe S.R.L.
Publication of WO2016098052A1 publication Critical patent/WO2016098052A1/fr
Publication of WO2016098052A8 publication Critical patent/WO2016098052A8/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
    • 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
    • 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
    • F16H2007/0806—Compression coil 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
    • F16H2007/0802—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
    • F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
    • F16H2007/084—Means for varying tension of belts, ropes, or chains with vibration damping means having vibration damping characteristics dependent on the moving direction of the tensioner
    • 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
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0865—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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0874—Two or more finally actuated members
    • 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 present invention relates to a tensioner for an accessory drive of an internal combustion engine, and in particular to a tensioner designed to be mounted directly on a reversible electric machine or starter/generator associated with an engine with "start-stop" functionality.
  • accessory drives the various accessories, including the generator, are operated by a common drive belt driven by the drive shaft.
  • an alternator that is always driven by the engine is used as a generator; thus, the taut side and the slack side of the belt are determined unequivocally and a tensioner acting on the slack side is used to keep the latter at a predetermined minimum tension level.
  • a reversible electric machine or starter/generator which has both the function of a generator and of an electric motor, is used instead of a conventional alternator. This enables providing new functions such as automatically switching off the engine when stationary (start-stop) and/or an increase in driving torque (boost) .
  • the slack side of the belt varies according to whether the starter/generator behaves as a motor or as a generator.
  • a tensioner is thus needed that is able to act on both sides of the belt, according to the working phases of the starter/generator .
  • the tensioners are subjected to high-amplitude oscillations under certain engine operating conditions, such as when starting up for example .
  • the object of the present invention is a tensioner comprising an improved damping device capable of solving the aforesaid problem in an inexpensive and compact manner.
  • Figure 1 is a perspective view of a tensioner with two degrees of freedom comprising a damping device according to the invention
  • Figure 2 is a partial axial section of the tensioner in Figure 1;
  • Figure 3 is a section along line III-III of the tensioner in Figure 2 ;
  • Figure 4 is a perspective view of the damping device according to the invention.
  • Figure 5 is a graph showing the damping torque as a function of the relative rotation of elements of the tensioner in Figure 1 ;
  • Figure 6 is a perspective view of a tensioner with one degree of freedom comprising a damping device according to the invention.
  • Figure 7 is a partial axial section of the tensioner in Figure 6 ;
  • Figure 8 is a section along line VIII-VIII of the tensioner in Figure 7.
  • a starter/generator 1 is shown that is fastened to an engine block (not shown) and comprises a casing 2 housing a stator and a rotor (not shown) and a drive pulley 3 fitted on a shaft integral with the rotor (also not shown) .
  • the pulley 3 is designed to be coupled to a drive belt 4 (not shown) .
  • a tensioner 6 with two degrees of freedom is mounted on a support structure 5 that is fastened to the casing 2.
  • the structure 5 has two arms 7 and 8, designed to be fastened to the casing 2 of the starter/generator and downwardly converging to each other, and an L-shaped bracket 9 carried in a cantilevered manner by the arms 7 and 8. More specifically, the two arms 7 and 8 have respective proximal ends connected to the casing 2 of the starter/generator 1 by screws, and respective distal ends joined together.
  • the bracket 9 has a wall 11 parallel to the axis A of the pulley 3 and connected to the distal ends of the arms 7 and 8, and a wall 12 perpendicular to wall 11 and extending upwards from the latter in a position facing the pulley 3 and axially spaced apart therefrom.
  • the tensioner 6 is mounted in a rotationally free manner, by means of a bearing 14, on a pin 13 that projects from the wall 12 towards the pulley 3 and is coaxial therewith.
  • the tensioner 6 comprises a body 15 formed by an annular portion 16 rotationally coupled to the pin 13 by means of the bearing 14 and an elongated support 17, arranged tangentially with respect to the annular portion 16 and integrally fastened thereto at its ends 18 and 19 by a pair of arms 21 and 22, substantially radial with respect to the annular portion 16.
  • the tensioner 6 also comprises a first pulley 23 and a second pulley 24 carried by the support 17 as described hereinafter.
  • the first pulley 23 is hinged in a fixed position to end 18 of the support 17; the second pulley 24 is hinged to a block 25 movable along a guide portion 26 of the support 17 adjacent to end 19.
  • Pulleys 23 and 24 cooperate from opposite ends with respective portions of the belt 4 and are respectively arranged downstream and upstream of pulley 3.
  • the support 17 also comprises a cavity 27 adjacent to end 18 and separated from the guide portion 26 by an intermediate transverse separator 28.
  • the guide portion 26 and the cavity 27 are closed at the front by a cover 29 (shown with a broken line in Figure 1) .
  • the block 25 is slidingly mounted on bars 31 fixed between end 19 and the separator 28 of the support 17.
  • the separator 28 has an opening 32 in which a quadrangular shaped bush 33 is inserted.
  • a piston 34 is slidingly housed with a predetermined clearance in the cavity 27 and connected to one end of a square- sectioned rod 35 mounted passing through the bush 33 and prismatically coupled thereto. At its opposite end, the rod 35 is fastened to the block 25.
  • Springs 36 designed to push the piston 34 towards the end 18 of the support 17 are interposed between the piston 34 and the separator 28 so as to pull pulley 24 towards pulley 23 and in this way exert the tensioning force on the belt 4.
  • the cavity 27 contains a viscous fluid.
  • the piston 34 defines a viscous dynamic damper.
  • the use of a linear guide enables providing this damping between the two pulleys 23 and 24 in a simple and reliable manner.
  • the tensioner 6 comprises a damping device 60 designed to dampen the relative oscillations between the body 15 and the pin 13.
  • the damping device 60 comprises a first damper 61 with constant damping and a second damper 62 with variable damping.
  • the first damper 61 comprises a Belleville spring 63 axially interposed between wall 12 and a friction ring 64 carried by the body 15.
  • the second damper 62 is housed on a radial protrusion 65 of the pin 13 and substantially comprises a C-shaped bush 66 frictionally cooperating with a radial protrusion 65 and an open metal ring 67 radially force-fitted on the bush 66 and rotationally coupled thereto by means of a pair of radial projections 68 that engage corresponding holes in the ring 69 ( Figure 7B) .
  • the ring 67 comprises respective radially external lugs 70 housed inside a circumferential seat 71 of the body 15 angularly delimited by respective walls 72 and 73, with which the lugs 70 are designed to cooperate as described hereinafter .
  • a first damping Dl given by damper 61, acts independently of the angle and direction of relative rotation of the body 15 with respect to the pin 13. This damping is sized so as to optimize the oscillation filtering function under engine running conditions.
  • a tensioner 78 with one degree of freedom is shown that comprises an improved damping device according to the invention.
  • the tensioner 78 comprises a body 15 connected to an alternator/generator, not shown here, by means of a support structure 5.
  • the body 15 comprises a circular-shaped central part 79, supported to freely rotate on the pin 13 and coaxial with axis A.
  • the tensioner 78 also comprises two curved arms 80 and 81 extending from opposite ends of the central part 79 on which they have a common origin. The distal ends of the arms 80 and 81 with respect to the central part 79 carry, in a rotationally free manner, respective pulleys 23 and 24 cooperating with the belt 4. In this case, the tensioner therefore has only one degree of freedom, given by the rotation of the body 15 about the pin 13, while the pulleys 23 and 24 have fixed axes with respect to the body 15.
  • the tensioner 78 comprises a first and a second damper 61 and 62 respectively providing a fixed damping and a variable damping between the body 15 and the support structure 5.
  • the damper 62 is arranged on a radial protrusion 65 of the pin 13 and the protrusions 70 of the ring 67 cooperate with the lateral walls of an opening 71 made in the central part 79 of the body 15 (Fig. 8) .
  • the damper 61 comprises a Belleville spring 63 axially interposed between the central body 79 of the tensioner 78 and a friction ring 64 carried by a cover 82 integral with the hub 13 (Fig. 7) .
  • the pulleys 23 and 24 have fixed axes with respect to the body 15 and so any variations in tension on the belt 4 instantaneously turn into rotations of the body 15 on the hub 13.
  • damper 60 the only damping force provided is that of damper 60.
  • the damping acting between the pin 13 and the body 15 can again be described by referring to the diagram in Figure 5.
  • a first damping Dl given by damper 61, acts independently of the angle and direction of relative rotation of the body 15 with respect to the pin 13. This damping is sized so as to optimize the oscillation filtering function under engine running conditions .
  • Damping D2 is due to the increase in the radial load exerted by the ring 67 on the bush 66 resulting from the contact of one of the lugs 70 with the respective stop wall 72 or 73 and the consequent radial contraction of the bush 66.
  • damper 62 that is only activated upon exceeding predetermined angles of rotation of the tensioner 6 with respect to the hub 13 enables achieving a damping torque of varying intensity according to the operating conditions, and therefore an optimized damping value under all conditions.
  • the damper is compact, simple and inexpensive.
  • damping system acting between the pulleys 23 and 24 of the tensioner 6 could be modified.

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 porte sur un tendeur pour un boîtier d'accessoires d'un moteur à combustion interne comportant un démarreur-générateur (1), le tendeur (6 ; 78) comprenant un support (5) conçu de façon à être fixé sur le démarreur-générateur (1), un corps (15) porté par ledit support (5) et pouvant tourner autour d'un premier axe (A) et deux poulies (23, 24) portées par ledit corps (15) et pouvant tourner par rapport à celui-ci autour d'axes respectifs parallèles au premier axe (A) ; et le tendeur (6 ; 78) comprenant un dispositif d'amortissement (60) interposé entre le corps (15) et le support (5), le dispositif d'amortissement (60) comprenant un amortisseur (62) définissant un amortissement dépendant d'un angle de rotation relatif entre le corps (15) et le support (5).
PCT/IB2015/059738 2014-12-17 2015-12-17 Tendeur comprenant un dispositif d'amortissement amélioré WO2016098052A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITTO2014A001060 2014-12-17
ITTO20141060 2014-12-17
ITTO20150161 2015-03-11
ITTO2015A000161 2015-03-11

Publications (2)

Publication Number Publication Date
WO2016098052A1 true WO2016098052A1 (fr) 2016-06-23
WO2016098052A8 WO2016098052A8 (fr) 2016-10-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/059738 WO2016098052A1 (fr) 2014-12-17 2015-12-17 Tendeur comprenant un dispositif d'amortissement amélioré

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111712654A (zh) * 2018-01-03 2020-09-25 盖茨公司 张紧器
EP3755924A4 (fr) * 2018-02-19 2021-09-29 BorgWarner Inc. Tendeur de courroie à poulie coulissante

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10044645A1 (de) * 2000-09-08 2002-03-21 Schaeffler Waelzlager Ohg Vorrichtung zur bedarfsgerecht geregelten Einstellung der Zugmittelvorspannung
WO2003040592A1 (fr) * 2001-11-06 2003-05-15 The Gates Corporation Tendeur de courroie lineaire a course limitee
US20030176250A1 (en) * 2002-03-15 2003-09-18 Austin Steven G. Initial belt tensioner
EP2128489A2 (fr) * 2008-05-28 2009-12-02 Muhr und Bender KG Dispositif de serrage de bride pour application de générateur/démarreur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10044645A1 (de) * 2000-09-08 2002-03-21 Schaeffler Waelzlager Ohg Vorrichtung zur bedarfsgerecht geregelten Einstellung der Zugmittelvorspannung
WO2003040592A1 (fr) * 2001-11-06 2003-05-15 The Gates Corporation Tendeur de courroie lineaire a course limitee
US20030176250A1 (en) * 2002-03-15 2003-09-18 Austin Steven G. Initial belt tensioner
EP2128489A2 (fr) * 2008-05-28 2009-12-02 Muhr und Bender KG Dispositif de serrage de bride pour application de générateur/démarreur

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111712654A (zh) * 2018-01-03 2020-09-25 盖茨公司 张紧器
CN111712654B (zh) * 2018-01-03 2023-12-26 盖茨公司 张紧器
EP3755924A4 (fr) * 2018-02-19 2021-09-29 BorgWarner Inc. Tendeur de courroie à poulie coulissante

Also Published As

Publication number Publication date
WO2016098052A8 (fr) 2016-10-20

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