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WO2007066363A1 - Tensioning device for a belt drive of a vehicle - Google Patents

Tensioning device for a belt drive of a vehicle 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
French (fr)
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/en
Publication of WO2007066363A1 publication Critical patent/WO2007066363A1/en

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

A tensioning device (1) for a belt (4) of a belt drive comprising a blade element integrally defining a shoe portion (11) adapted to co-operate with the belt (4), a constraint portion (5, 6) adapted to co-operate with a fixed constraint (3) and at least one resilient bending portion (12; 18) interposed between the pad portion (11) and the constraint portion (5, 6).

Description

TENSIONING DEVICE FOR A BELT DRIVE OF A VEHICLE
TECHNICAL FIELD
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.
BACKGROUND ART
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.
In particular, 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.
Recently, belt drives have been developed for applications in the presence of oil. For such applications it is envisaged the use of shoe tensioners such as those used in combination with chains, which are more compact than the automatic arm tensioners previously described.
However, the shoe tensioners used with chains are not suitable for recovering the bending oscillations typical of belts and are, moreover, relatively expensive and complex.
DISCLOSURE OF INVENTION
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 .
The object of this invention is achieved by means of a tensioning device as described in claim 1.
BRIEF DESCRIPTION OF THE INVENTION
For a better understanding of the present invention, it will now be described a preferred embodiment, by way of non-limitative example, and with reference to the accompanying drawings, in which:
- figure 1 is a side view of a tensioning device according to the present invention; and
- figure 2 is a side view of a second embodiment of the present invention.
BEST MODE FOR CARRYING OUT THE 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 β, 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.
Moreover, 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.
In particular, 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 λS-shaped' profile with the elbow portion 20 and an arm 23 facing towards the constraint portion 6.
In particular, 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.
In use, 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.
In use, 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.
In particular, 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 use of the bending springs to support the shoe element 11 makes it possible to reach a compromise between the opposing needs of allowing considerable deformability in order to recover the oscillations of the belt and maintain correct average tension of the belt 4.
Moreover, during every bending movement of the belt 4, the free end portion 24 loaded by the arm 23 moves onto the contact face 25 generating a damping to stabilise the dynamic behaviour of the belt 4.
The advantages that the tensioning device 1 previously described allows to achieve are as follows.
In particular, the tensioning device 1 is simple to built and assemble and has reduced dimensions, making it possible to recover the oscillations of the belt.
Moreover, the tensioning device 1 can be constructed using an easily automated process such as bending.
Finally, it is clear that changes and variations to the tensioning device here described and illustrated can be made without departing from the scope of protection of the present invention, as defined by the annexed claims.
In particular, 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.
Moreover, it is possible to envisage that 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. In particular, in the present description and in the claims, the term Λco-operate' does not imply direct contact.
Moreover, if it is necessary to increase the damping of the tensioning device 1, it is possible to cover the free end portion 24 and/or the contact face 25 of the straight portion 14 with a friction material.
Alternatively, the contact face 25 can be suitably shaped to change the damping by modifying the geometry of the surfaces in relative contact. For example, the surface 25 can define a recess co-operating with the free end portion 24 in order to increase the damping.
Moreover, it is possible to change the geometry of the tensioning device 1 to meet different requirements of dimension or stiffness. For example, to reduce the stiffness and the dimension in a transverse direction with respect to the contact surface 19, the elbow portion 20 could be directly connected to the arm 23, which in this case extends towards the connecting portion 18.
Alternatively, as shown in figure 2, it is possible to bend the arm 23 towards the shoe element 11. In this case the resilient bending element 12 comprises an elbow portion 30 bent towards the pad element 11 and defining a λC-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.
Moreover, it is possible to envisage that the elbow portion 30 or the elbow portion 20 could co-operate in contact with the arm 5, thus increasing the damping. In this manner, the connecting portion 18 and the elbow portions 20, 30 are operatively connected in parallel allowing the elastic flexural element 12 to be stiffened.

Claims

1. A tensioning device (1) for a belt (4) of a belt drive, characterised in that it comprises a blade element integrally defining a shoe portion (11) adapted to co-operate with said belt (4), a constraint portion (5, 6) adapted to co-operate with a fixed constraint (3, 16) and at least one resilient bending portion (12; 18) interposed between said shoe portion (11) and said constraint portion (5, 6) .
2. A tensioning device according to claim 1, characterised in that said blade element comprises a second resilient bending portion (12) connected to said shoe element (11) of a part longitudinally opposite to that of said first resilient bending portion (18) and acting in parallel with said first resilient bending portion (18) .
3. A tensioning device according to claim 2, characterised in that said first resilient bending portion (18) comprises an elbow portion.
4. A tensioning device according to claim 3, characterised in that said constraint portion (5, 6) comprises a supporting arm (5) connected to said elbow portion (18) and in that said second resilient bending portion (12) comprises a second elbow portion (20) to co-operate with said supporting arm (5) .
5. A tensioning device according to claim 4, characterised in that said second resilient portion (12) comprises an arm (23) presenting a free end portion (24) co-operating in contact against either of said supporting arms (5) and the pad element (11) against said supporting arm (5) .
6. A tensioning device according to claim 5, characterised in that said second resilient portion (12) comprises a third elbow portion (22) defining an λS'- shape with said second elbow portion (20) and supporting said arm (23) against said shoe element (11) .
7. A tensioning device according to claim 5, characterised in that said second resilient portion (12) comprises a third elbow portion (30) defining a ΛC- shape with said second elbow portion (20) and supporting said arm (23) .
8. A tensioning device according to any of the claims from 4 to 7, characterised in that said supporting arm (5) comprises a constraint portion (6) defining a circular seat (22) adapted to be hinged about a pin (3) .
9. A tensioning device according to claim 8, characterised by comprising a abutting portion (14) adapted of cooperating against a second fixed element (16) to maintain said shoe portion (11) against said belt (4) .
10. A tensioning device according to claim 9, characterised in that said abutting portion (14) is carried by said supporting arm (5) and co-operates in contact with said resilient bending portion (12) .
11. A tensioning device according to any of the previous claims, characterised in that said shoe element (11) defines a contact surface (19) adapted to cooperate directly with said belt (4) .
12. A tensioning device according to any of the previous claims, characterised in that said blade element is made by plastic deformation from a metal strip.
PCT/IT2005/000723 2005-12-07 2005-12-07 Tensioning device for a belt drive of a vehicle WO2007066363A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2005/000723 WO2007066363A1 (en) 2005-12-07 2005-12-07 Tensioning device for a belt drive of a vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2005/000723 WO2007066363A1 (en) 2005-12-07 2005-12-07 Tensioning device for a belt drive of a vehicle

Publications (1)

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

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PCT/IT2005/000723 WO2007066363A1 (en) 2005-12-07 2005-12-07 Tensioning device for a belt drive of a vehicle

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015989A1 (en) * 2007-04-03 2008-10-09 Schaeffler Kg Mechanically damped clamping system
DE102007029939A1 (en) * 2007-06-28 2009-01-02 Ford Global Technologies, LLC, Dearborn Drive system e.g. combustion engine, for motor vehicle, has drive wheel and driven gear that are connected with each other over drive unit, and monolithic clamping and attachment unit with fixed end and detachable end
DE102007033420A1 (en) * 2007-07-18 2009-01-22 Audi Ag Endless belt drive for e.g. internal combustion engine, of motor vehicle, has rotary drive unit pressurized for practicing spinning function with clamping unit directly impinging on drive unit, where clamping unit is formed as leaf spring
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 (en) * 2000-12-01 2002-02-21 Murtfeldt Kunststoffe GmbH, 44309 Dortmund Clamping device for conveying or driving means

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 (en) * 2000-12-01 2002-02-21 Murtfeldt Kunststoffe GmbH, 44309 Dortmund Clamping device for conveying or driving means

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015989A1 (en) * 2007-04-03 2008-10-09 Schaeffler Kg Mechanically damped clamping system
DE102007015989B4 (en) * 2007-04-03 2019-04-25 Schaeffler Technologies AG & Co. KG Mechanically damped clamping system
DE102007029939A1 (en) * 2007-06-28 2009-01-02 Ford Global Technologies, LLC, Dearborn Drive system e.g. combustion engine, for motor vehicle, has drive wheel and driven gear that are connected with each other over drive unit, and monolithic clamping and attachment unit with fixed end and detachable end
DE102007033420A1 (en) * 2007-07-18 2009-01-22 Audi Ag Endless belt drive for e.g. internal combustion engine, of motor vehicle, has rotary drive unit pressurized for practicing spinning function with clamping unit directly impinging on drive unit, where clamping unit is formed as leaf spring
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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