WO2007066363A1 - Dispositif tendeur pour transmission a courroie d'un vehicule - Google Patents

Dispositif tendeur pour transmission a courroie d'un vehicule Download PDF

Info

Publication number
WO2007066363A1
WO2007066363A1 PCT/IT2005/000723 IT2005000723W WO2007066363A1 WO 2007066363 A1 WO2007066363 A1 WO 2007066363A1 IT 2005000723 W IT2005000723 W IT 2005000723W WO 2007066363 A1 WO2007066363 A1 WO 2007066363A1
Authority
WO
WIPO (PCT)
Prior art keywords
tensioning device
belt
elbow
shoe
resilient
Prior art date
Application number
PCT/IT2005/000723
Other languages
English (en)
Inventor
Franco Cipollone
Gianluca Pane
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.
Priority to PCT/IT2005/000723 priority Critical patent/WO2007066363A1/fr
Publication of WO2007066363A1 publication Critical patent/WO2007066363A1/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
    • F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
    • F16H7/0831—Means for varying tension of belts, ropes, or chains 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
    • F16H2007/0804—Leaf springs

Definitions

  • the present invention is related to a tensioning device for a belt drive of an internal combustion engine of a vehicle, in particular to a belt drive for applications in the presence of oil.
  • Dry belt drives comprising a plurality of pulleys linked to respective rotating members are known, including an engine crankshaft, a belt wounded around the pulleys and an automatic tensioner to guide and maintain the belt under tension.
  • the automatic tensioner comprises a supporting body fixed to a wall of the engine, an arm hinged on the supporting body, an idle pulley carried by the arm and a helical spring connected to the supporting body and actuating the arm against the belt.
  • shoe tensioners such as those used in combination with chains, which are more compact than the automatic arm tensioners previously described.
  • shoe tensioners used with chains are not suitable for recovering the bending oscillations typical of belts and are, moreover, relatively expensive and complex.
  • the object of this invention is to obtain a tensioning device for a belt drive for applications in the presence of oil, which is free from the above- mentioned drawbacks .
  • FIG. 1 is a side view of a tensioning device according to the present invention.
  • FIG. 2 is a side view of a second embodiment of the present invention.
  • Figure 1 shows a tensioning device 1 for a belt drive for applications in the presence of oil, for an internal combustion engine.
  • the tensioning device 1 is constrained to a wall 2 of the internal combustion engine by a pin 3 and is adapted to co-operate by sliding with a belt 4 of the belt drive partially shown in figure 1.
  • the tensioning device 1 defines a single blade element and is formed by bending a metal strip.
  • the blade element comprises a supporting arm 5 defining a constraint end portion 6 hinged to the pin 3, a shoe element 11 connected to the supporting arm 5 on the longitudinal side opposite to the constraint portion 6 and bent towards the constraint portion 6, and a resilient bending element 12 co-operating with the shoe element 11 and the supporting arm 5.
  • the supporting arm 5 further comprises a first straight portion 13 connected to the constraint portion ⁇ , a second straight portion 14 defining both an obtuse angle with the straight portion 13 and a face 15 adapted to abut against a fixed element 16 carried by the wall 2.
  • the constraint portion 6 of the supporting arm 5 defines a circular seat 17 adapted to couple onto the pin 3.
  • the shoe element 11 is arranged on the opposite side of the face 15 with respect to the straight portion 14 and is connected to the straight portion 14 by means of a resilient connecting portion 18 arranged on the same side of the straight portion 13 as the straight portion 14. Moreover, the shoe element 11 is of an elongated shape and defines a convex contact surface 19 adapted to co-operate directly in contact with the belt 4.
  • the connecting portion 18 defines an "elbow portion" and this term designates hereinafter a portion that reciprocally connects two straight elements forming an angle of less than 180° and presenting a bending radius, or which connects two arched elements having respective bending radiuses bigger than the bending radius of the elbow portion.
  • the resilient bending element 12 is connected to the shoe element 11 on the longitudinal side opposite to the connecting portion 18 and comprises in sequence starting from the shoe element 11, an elbow portion 20 bent towards the connecting portion 18 and arranged beside the straight portion 13, a straight portion 21 facing the straight portion 14, a second elbow portion 22 defining an ⁇ S-shaped' profile with the elbow portion 20 and an arm 23 facing towards the constraint portion 6.
  • the arm 23 has a free end portion 24 longitudinally opposite to the elbow portion 22 and bent towards the straight portion 21 to co-operate in contact with a contact face 25 on the straight portion 14 opposite to the face 15 and facing the straight portion 21.
  • the tensioning device 1 is in the presence of lubricating oil which generates a lubrication meatus between the belt 4 and the contact surface 19 allowing both reduced friction and cooling of the components in relative motion.
  • the shoe element 11 is loaded against the belt 4 by means of the resilient bending element 12 and the connecting portion 18 in order to correctly guide and tension the belt 4.
  • the connecting portion 18 and the elbow portions 20, 22 define a system of springs in which the elbow portions 20, 22 are operatively connected in series and the connecting portion 18 and the elbow portions 20, 22 are operatively connected in parallel .
  • the tensioning device 1 is simple to built and assemble and has reduced dimensions, making it possible to recover the oscillations of the belt.
  • the tensioning device 1 can be constructed using an easily automated process such as bending.
  • the tensioning device 1 can be constrained in a different manner to the wall 2, for example by means of a second pin that replaces either the fixed element 16 or the pin 3 and is abutly arranged against a concave surface defined by the connecting portion 18.
  • the contact surface 19 is defined by a coating layer or a bent element rigidly connected to the shoe element 11. Also in this case the shoe element 11 co-operates with the belt 4.
  • the term ⁇ co-operate' does not imply direct contact.
  • the contact face 25 can be suitably shaped to change the damping by modifying the geometry of the surfaces in relative contact.
  • the surface 25 can define a recess co-operating with the free end portion 24 in order to increase the damping.
  • the geometry of the tensioning device 1 it is possible to change the geometry of the tensioning device 1 to meet different requirements of dimension or stiffness.
  • the elbow portion 20 could be directly connected to the arm 23, which in this case extends towards the connecting portion 18.
  • the resilient bending element 12 comprises an elbow portion 30 bent towards the pad element 11 and defining a ⁇ C-shaped' profile with the elbow portion 20.
  • the free end portion 24 co-operates in contact with a face 31 of the shoe element 11 opposite to the contact surface 19 and facing towards the straight portion 21.
  • the elbow portion 30 or the elbow portion 20 could co-operate in contact with the arm 5, thus increasing the damping.
  • the connecting portion 18 and the elbow portions 20, 30 are operatively connected in parallel allowing the elastic flexural element 12 to be stiffened.

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 dispositif tendeur (1) pour une courroie (4) d'une transmission à courroie comportant un élément de type ailette définissant intégralement une partie patin (11) adaptée à des fins de coopération avec la courroie (4), une partie contrainte (5, 6) adaptée à des fins de coopération avec une contrainte fixe (3) et au moins une partie pliante élastique (12 ; 18) intercalée entre la partie patin (11) et la partie contrainte (5, 6).
PCT/IT2005/000723 2005-12-07 2005-12-07 Dispositif tendeur pour transmission a courroie d'un vehicule WO2007066363A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2005/000723 WO2007066363A1 (fr) 2005-12-07 2005-12-07 Dispositif tendeur pour transmission a courroie d'un vehicule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2005/000723 WO2007066363A1 (fr) 2005-12-07 2005-12-07 Dispositif tendeur pour transmission a courroie d'un vehicule

Publications (1)

Publication Number Publication Date
WO2007066363A1 true WO2007066363A1 (fr) 2007-06-14

Family

ID=36763225

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2005/000723 WO2007066363A1 (fr) 2005-12-07 2005-12-07 Dispositif tendeur pour transmission a courroie d'un vehicule

Country Status (1)

Country Link
WO (1) WO2007066363A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015989A1 (de) * 2007-04-03 2008-10-09 Schaeffler Kg Mechanisch gedämpftes Spannsystem
DE102007029939A1 (de) * 2007-06-28 2009-01-02 Ford Global Technologies, LLC, Dearborn Spannsystem
DE102007033420A1 (de) * 2007-07-18 2009-01-22 Audi Ag Endlostrieb mit einem umlaufenden Triebmittel und Spannmittel
US9726051B2 (en) 2012-10-22 2017-08-08 Litens Automotive Partnership Tensioner with increased damping
US9869379B2 (en) 2013-09-11 2018-01-16 Litens Automotive Partnership Tensioner with increased damping and arm on base cup configuration
US9982761B2 (en) 2013-05-14 2018-05-29 Litens Automotive Partnership Tensioner with improved damping

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB155646A (en) * 1919-09-23 1920-12-23 John Weller Improvements in or relating to means for transmitting motion
GB445152A (en) * 1935-05-15 1936-04-03 Standard Motor Co Ltd Automatic tensioners for transmission chains
US2355003A (en) * 1943-03-12 1944-08-01 Chain Belt Co Lubricating mechanism for sprocket chains
GB1012934A (en) * 1963-06-11 1965-12-15 North British Rubber Co Ltd Improvements in and relating to a flexible belt drive
DE20020350U1 (de) * 2000-12-01 2002-02-21 Murtfeldt Kunststoffe Gmbh Spannvorrichtung für Förder- oder Antriebsmittel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB155646A (en) * 1919-09-23 1920-12-23 John Weller Improvements in or relating to means for transmitting motion
GB445152A (en) * 1935-05-15 1936-04-03 Standard Motor Co Ltd Automatic tensioners for transmission chains
US2355003A (en) * 1943-03-12 1944-08-01 Chain Belt Co Lubricating mechanism for sprocket chains
GB1012934A (en) * 1963-06-11 1965-12-15 North British Rubber Co Ltd Improvements in and relating to a flexible belt drive
DE20020350U1 (de) * 2000-12-01 2002-02-21 Murtfeldt Kunststoffe Gmbh Spannvorrichtung für Förder- oder Antriebsmittel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015989A1 (de) * 2007-04-03 2008-10-09 Schaeffler Kg Mechanisch gedämpftes Spannsystem
DE102007015989B4 (de) * 2007-04-03 2019-04-25 Schaeffler Technologies AG & Co. KG Mechanisch gedämpftes Spannsystem
DE102007029939A1 (de) * 2007-06-28 2009-01-02 Ford Global Technologies, LLC, Dearborn Spannsystem
DE102007033420A1 (de) * 2007-07-18 2009-01-22 Audi Ag Endlostrieb mit einem umlaufenden Triebmittel und Spannmittel
US9726051B2 (en) 2012-10-22 2017-08-08 Litens Automotive Partnership Tensioner with increased damping
US9790817B2 (en) 2012-10-22 2017-10-17 Litens Automotive Partnership Tensioner with increased damping
US9982761B2 (en) 2013-05-14 2018-05-29 Litens Automotive Partnership Tensioner with improved damping
US9869379B2 (en) 2013-09-11 2018-01-16 Litens Automotive Partnership Tensioner with increased damping and arm on base cup configuration

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