DE10327214A1 - Spring tensioning and damping system for belt drive for accessory in internal combustion engine has chamber with restricted access for oil, acting as damping chamber - Google Patents

Spring tensioning and damping system for belt drive for accessory in internal combustion engine has chamber with restricted access for oil, acting as damping chamber

Info

Publication number
DE10327214A1
DE10327214A1 DE2003127214 DE10327214A DE10327214A1 DE 10327214 A1 DE10327214 A1 DE 10327214A1 DE 2003127214 DE2003127214 DE 2003127214 DE 10327214 A DE10327214 A DE 10327214A DE 10327214 A1 DE10327214 A1 DE 10327214A1
Authority
DE
Germany
Prior art keywords
damping element
tensioning
characterized
spring
element according
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.)
Ceased
Application number
DE2003127214
Other languages
German (de)
Inventor
Uwe Dipl.-Ing. Michael
Martin Dipl.-Ing. Wolf
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
Priority to DE2003127214 priority Critical patent/DE10327214A1/en
Publication of DE10327214A1 publication Critical patent/DE10327214A1/en
Ceased legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H7/0829Means for varying tension of belts, ropes, or chains with vibration damping means
    • F16H7/0836Means for varying tension of belts, ropes, or chains with vibration damping means of the fluid and restriction type, e.g. dashpot
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H7/00Gearings for conveying rotary motion by endless flexible members
    • F16H7/08Means for varying tension of belts, ropes, or chains
    • F16H2007/0802Actuators for final output members
    • F16H2007/0806Compression coil springs

Abstract

The spring tensioning and damping system (1) for a belt drive has a bearing (9) connected to a rod (6) entering a chamber with restricted access for oil. This acts as a damping chamber and contains a spring (19). The spring engages on a floating piston (14) with seals (16). Oil may flow from a low-pressure chamber (13b) into an upper chamber (13a) under the floating piston.

Description

  • Territory of invention
  • prestressed and damping element for traction drives, especially belt drives for Ancillary components of internal combustion engines, preferably for motor vehicles, wherein the tensioning element is designed as a tensioning unit and the tensile force is generated by a compression spring which frictionally with a Drawbar on the one hand and with a housing on the other hand in operative connection stands, and the damping element designed as a hydraulic unit is the two a liquid containing spaces having a space designed as a high pressure room, one bounding the space and connected to the drawbar Having piston and by means of at least one throttle opening and a check valve with the storage space formed as a second space in conjunction stands.
  • background the invention
  • Such a tensioning and damping element is from the EP 0 388 293 B1 known. In a solution proposed by this tensioning and damping device, the compression spring limits the high-pressure chamber. To make the tightness, the spring is provided on its inside and between the spiral wire with an elastic sealing element. The spring with sealing element is expensive to manufacture, so that the clamping and damping element is expensive to manufacture. Furthermore, the sealing element and the internal pressure acting on the spring affect the spring characteristic, so that the clamping force of the clamping element is not easily defined clearly. Furthermore, there is the problem that when installing the tensioning and damping element according to the 2 and 3 Air can accumulate in the high pressure chamber, whereby the liquid tends to foaming, resulting in malfunction of the damping element.
  • According to the second embodiment 4 of the EP-0 388 293 B1 the compression spring is arranged in the high-pressure chamber of the damping unit, so that by the movement of the spring spiral against each other an additional displacement of the liquid takes place and the liquid therefore tends even faster to foaming, since the high-pressure chamber can not be kept safe even with this design with certainty.
  • Task of invention
  • task The invention is therefore to provide a tensioning and damping element, which avoids the disadvantages of the prior art and beyond easy and cheap is in production. It should also be designed so that the Clamping and damping element without lever support can be coupled directly to the tensioner.
  • Summary the invention
  • The The object of the invention is essentially achieved in that the tensioning element and the damping element as spatial and functionally independent Components executed are and that the components arranged substantially concentric with each other are.
  • By this embodiment is no mutual influence of the Clamping element and the damping element, so that both components are independent from each other to fulfill their function can, so that too the liquid not foamed by pinching movements of the spring and the spring on the other hand not by the liquid being affected. Nevertheless, the components can be low as a unit produce and use, since the essentially concentric to each other are arranged. The statement "im essential "should say that the components are not necessarily completely intertwined are arranged, but that protrude a component relative to the other component can or vice versa.
  • It be explicit pointed out that, in contrast to the drafting of the preamble of claim 1, the damping element designed as a mechanical unit can be, so the damping by a friction element which is connected to the housing and with the Pull rod is in operative connection, oscillatory movements of the clamping and damping element can effectively reduce.
  • In Another embodiment of the invention proposes that the damping element This is favorable because the clamping element with its compression spring not so sensitive to external influences, such as Pollution, etc. is, as the damping element.
  • In Advantageously, with the housing and with the pull rod depending a spring plate for the compression spring frictionally connected, whose active surfaces aligned with each other. If this spring plate then at a suitable distance arranged to each other, they provide sufficient space for the compression spring.
  • In an advantageous manner, the pull rod has a cylinder body and the housing has a cylinder jacket, wherein the cylinder body surrounds the compression spring and has a spring plate and the cylinder jacket is arranged inside the compression spring and has the second spring plate. Through this Design creates a spring chamber, which is closed on all sides and receives the compression spring.
  • one the spring plate and / or the cylinder body and / or the cylinder jacket have to releasably secured to one another or to the drawbar or to the housing be to use the compression spring in the closed space to can.
  • In Advantageously, within the cylinder jacket, the piston, the high-pressure, the storage room and a float cover arranged. The float cover is sealed in the cylinder jacket and on the pull rod guided. The float lid limits the liquid in the storage room and is in the direction of the liquid loaded by a compression spring. This configuration is now possible, after exact filling the damping device or the high-pressure and the reservoir with liquid or damping fluid These are available free of air while ensuring that through the exact Separation between liquid and Air volume no air gets into the hydraulic fluid and this foam leaves. The float cover can due to its leadership in the cylinder jacket and on the drawbar move with and against the force of the spring and cause a volume balance in the pantry, without causing air penetrates. Therefore, the function of the hydraulic damper element even at higher Safely ensures excitation frequencies.
  • Advantageous is a spring-loaded float cover provided with a Pressure increase of Hydraulic system is achievable and to a functional improvement contributes. These measures allow a geometric design of the high-pressure chamber and the storage space, to a volume change optimally balanced with a desired Pressure increase.
  • Short description the drawing
  • to further explanation The invention is directed to the drawing, in which an embodiment the invention is shown simplified.
  • The 1 shows a longitudinal section through a tensioning and damping element in sketched execution.
  • detailed Description of the drawing
  • In the figure, 1 generally designates a clamping element and 2 denotes a damping element. Since the items of the clamping element and the damping element are not completely separated from each other but experience a multiple use, the components described below are partly the clamping element 1 and partly the damping element 2 assigned.
  • With 3 is a housing, which is not shown, either attached to a part of the internal combustion engine or on a tension roller bearing lever or on the tensioner itself. The housing 3 is pot-shaped and has a cylinder jacket 4 on, at the end of a spring plate 5 is formed.
  • Furthermore, with 6 denotes a pull rod on which a cylinder body 7 attached, which in turn is a spring plate 5 that carries from the cylinder body 7 Seen from inside, while the spring plate 5 on the cylinder jacket 4 is molded to the outside. Between the spring plates 5 is a compression spring 8th built-in.
  • The drawbar 6 has a bearing in its eye 9 on, which is connected to a part of the internal combustion engine or with a lever of the tensioning roller or with the tensioning roller itself, wherein the housing 3 and the camp 9 are of course attached to opposite parts, so that a clamping element is formed, which generates in the traction mechanism, in particular a belt drive, a voltage, wherein the clamping element is designed so that a tensile force between the bearing 9 and the housing 3 is generated, according to the arrangement by the compression spring 8th arises.
  • The spring plates 5 have at their free edges guide elements 5a on, the supports between the cylinder jacket 4 and the cylinder body 7 form so that these parts and thus the housing 3 and the drawbar 6 are good against each other.
  • The drawbar 6 extends with its extension in the cylinder jacket 4 and is there with a piston 10 connected. Furthermore, in the cylinder jacket 4 a partition 11 provided so that between the partition wall 11 and the piston 10 a space is created as a high pressure room 12 is trained. Outside the dividing wall and the piston there are two spaces, the holes through a transverse bore 18a and a longitudinal bore 18b in the drawbar 6 interconnected and as storerooms 13a and 13b are executed. A pressure medium inlet from the storage room 13b in the high pressure room 12 via a disposable or non-return valve 17 , A pressure fluid outlet from the high pressure chamber 12 in the storerooms 13a . 13b via ring gaps 19a . 19b between the partition 11 and the drawbar 6 , or between the piston 10 and the cylinder jacket 4 , The annular gap 19a . 19b on the one hand and the check valve 17 on the other hand ensure a desired different pressure medium exchange between a pressure and pulling movement of the clamping and damping element 1 , The pantry 13 that is attached to the partition 11 connects is through a float cover 14 limited, which by means of a spring 15 at the drawbar 6 or on the cylinder body connected to the pull rod 7 supports and the float cover 14 in the direction of the pantry 13 pressure-loaded. The float cover 14 is by means of seals 16 opposite the cylinder jacket 4 and the drawbar 6 movably sealed.
  • The piston 10 and the partition 11 have cylindrical surfaces, which are the Zugstande 6 in the partition 11 and the piston 10 in the cylinder jacket 4 lead and possibly define throttle openings.
  • 1
    clamping element
    2
    damping element
    3
    casing
    4
    cylinder surface
    5
    spring plates
    5a
    guide elements
    6
    pull bar
    7
    cylinder body
    8th
    compression spring
    9
    camp
    10
    piston
    11
    partition wall
    12
    High-pressure chamber
    13a
    pantry
    13b
    pantry
    14
    float cover
    15
    feather
    16
    seals
    17
    check valve
    18a
    cross hole
    18b
    longitudinal bore
    19a
    annular gap
    19b
    annular gap

Claims (9)

  1. Clamping and damping element for traction drives, in particular belt drives for ancillary components of internal combustion engines, preferably for motor vehicles, wherein the tensioning element ( 1 ) is designed as a tensioning unit and the tensile force by a compression spring ( 8th ) is generated, the non-positively with a pull rod ( 6 ) on the one hand and with a housing ( 3 ) is in operative connection on the other hand, and the damping element ( 2 ) is designed as a hydraulic unit having two spaces containing a liquid, wherein a space as a high pressure space ( 12 ) is designed, one of the space limiting and with the drawbar ( 6 ) connected pistons ( 10 ) and by means of at least one as an annular gap ( 19a . 19b ) formed throttle opening and a one-way valve designed as a check valve ( 17 ) with the as storage space ( 13 ) formed second space, characterized in that the tensioning element ( 1 ) and the damping element ( 2 ) are designed as spatially and functionally independent components and that the components are arranged substantially concentric with each other.
  2. Tensioning and damping element according to claim 1, characterized in that the damping element ( 2 ) within the clamping element ( 1 ) is arranged.
  3. Tensioning and damping element according to one of claims 1 or 2, characterized in that with the housing ( 3 ) and with the drawbar ( 6 ) one spring plate each ( 5 ) for the compression spring ( 8th ) are positively connected, whose active surfaces are aligned.
  4. Tensioning and damping element according to one of the preceding claims, characterized in that with the tie rod ( 6 ) a cylinder body ( 7 ) connected to the compression spring ( 8th ) and carries one of the spring plate.
  5. Clamping and damping element according to one of the preceding claims, characterized in that the housing ( 3 ) a cylinder jacket ( 4 ), which within the compression spring ( 8th ) is arranged and to which the second spring plate is attached.
  6. Tensioning and damping element according to one of the preceding claims, characterized in that the spring plates ( 5 ) at its free ends guide elements ( 5a ), which on the cylinder body ( 7 ) and cylinder jacket ( 4 ).
  7. Tensioning and damping element according to one of the preceding claims, characterized in that inside the cylinder jacket ( 4 ) The piston ( 10 ), the high-pressure space ( 12 ), the storeroom ( 13 ) and a float cover ( 14 ) are arranged.
  8. Tensioning and damping element according to one of the preceding claims, characterized in that the float cover ( 14 ) sealing in the cylinder jacket ( 4 ) and on the drawbar ( 6 ) is guided.
  9. Tensioning and damping element according to one of the preceding claims, characterized in that the float cover ( 14 ) the liquid in the storage room ( 13 ) and spring loaded in the direction of the liquid ( 15 ).
DE2003127214 2003-06-17 2003-06-17 Spring tensioning and damping system for belt drive for accessory in internal combustion engine has chamber with restricted access for oil, acting as damping chamber Ceased DE10327214A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2003127214 DE10327214A1 (en) 2003-06-17 2003-06-17 Spring tensioning and damping system for belt drive for accessory in internal combustion engine has chamber with restricted access for oil, acting as damping chamber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2003127214 DE10327214A1 (en) 2003-06-17 2003-06-17 Spring tensioning and damping system for belt drive for accessory in internal combustion engine has chamber with restricted access for oil, acting as damping chamber

Publications (1)

Publication Number Publication Date
DE10327214A1 true DE10327214A1 (en) 2005-01-13

Family

ID=33520652

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2003127214 Ceased DE10327214A1 (en) 2003-06-17 2003-06-17 Spring tensioning and damping system for belt drive for accessory in internal combustion engine has chamber with restricted access for oil, acting as damping chamber

Country Status (1)

Country Link
DE (1) DE10327214A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007098779A1 (en) * 2006-02-27 2007-09-07 Festo Ag & Co. Kg Tensioning arrangement for at least one circulating transporting belt
DE102007018961A1 (en) * 2007-04-21 2008-10-23 Bayerische Motoren Werke Aktiengesellschaft Hydraulic clamping device for a traction mechanism

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7703393U1 (en) * Boge Gmbh, 5208 Eitorf
DE3741860A1 (en) * 1987-12-10 1989-06-22 Schaeffler Waelzlager Kg Tension device for a belt
DE4203449A1 (en) * 1992-02-07 1993-08-12 Schaeffler Waelzlager Kg Belt tensioning device for the drive of secondary assemblies of engines - has friction body formed by two wedged piston parts set axially in succession
DE4304389A1 (en) * 1993-02-13 1994-08-18 Schaeffler Waelzlager Kg Belt-tensioning device
EP0388293B1 (en) * 1989-03-17 1994-10-05 Hutchinson S.A. Drive belt tensioning device
DE19743480A1 (en) * 1996-11-04 1998-05-07 Schaeffler Waelzlager Ohg Belt tensioning system in internal combustion engine
US6036612A (en) * 1995-12-27 2000-03-14 Ntn Corporation Hydraulic autotensioner unit having an external spring encircling an actuator cylinder
JP2000170857A (en) * 1998-12-04 2000-06-23 Ntn Corp Hydraulic auto-tensioner and belt tension adjusting device
DE19961815A1 (en) * 1998-12-23 2000-06-29 Renold Plc Chain or belt tensioner, with chamber, piston and spring threaded to casing
JP2003156108A (en) * 2001-11-20 2003-05-30 Ntn Corp Hydraulic automatic tensioner

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7703393U1 (en) * Boge Gmbh, 5208 Eitorf
DE3741860A1 (en) * 1987-12-10 1989-06-22 Schaeffler Waelzlager Kg Tension device for a belt
EP0388293B1 (en) * 1989-03-17 1994-10-05 Hutchinson S.A. Drive belt tensioning device
DE4203449A1 (en) * 1992-02-07 1993-08-12 Schaeffler Waelzlager Kg Belt tensioning device for the drive of secondary assemblies of engines - has friction body formed by two wedged piston parts set axially in succession
DE4304389A1 (en) * 1993-02-13 1994-08-18 Schaeffler Waelzlager Kg Belt-tensioning device
US6036612A (en) * 1995-12-27 2000-03-14 Ntn Corporation Hydraulic autotensioner unit having an external spring encircling an actuator cylinder
DE19743480A1 (en) * 1996-11-04 1998-05-07 Schaeffler Waelzlager Ohg Belt tensioning system in internal combustion engine
JP2000170857A (en) * 1998-12-04 2000-06-23 Ntn Corp Hydraulic auto-tensioner and belt tension adjusting device
DE19961815A1 (en) * 1998-12-23 2000-06-29 Renold Plc Chain or belt tensioner, with chamber, piston and spring threaded to casing
JP2003156108A (en) * 2001-11-20 2003-05-30 Ntn Corp Hydraulic automatic tensioner

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007098779A1 (en) * 2006-02-27 2007-09-07 Festo Ag & Co. Kg Tensioning arrangement for at least one circulating transporting belt
CN101410314B (en) * 2006-02-27 2011-12-14 费斯托股份有限两合公司 Tensioning device for at least one circumferential conveying segment
DE102007018961A1 (en) * 2007-04-21 2008-10-23 Bayerische Motoren Werke Aktiengesellschaft Hydraulic clamping device for a traction mechanism
EP1983218A3 (en) * 2007-04-21 2009-05-20 Bayerische Motoren Werke Aktiengesellschaft Hydraulic tensioning device for a tractor transmission system

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OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8127 New person/name/address of the applicant

Owner name: SCHAEFFLER KG, 91074 HERZOGENAURACH, DE

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Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 H, DE

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