DE102005047265A1 - Clamping device for use in traction mechanism drive, has friction unit pressed with friction surfaces towards outward at inner wall of external cylinder and/or towards inward at outer wall of inner cylinder - Google Patents

Clamping device for use in traction mechanism drive, has friction unit pressed with friction surfaces towards outward at inner wall of external cylinder and/or towards inward at outer wall of inner cylinder

Info

Publication number
DE102005047265A1
DE102005047265A1 DE200510047265 DE102005047265A DE102005047265A1 DE 102005047265 A1 DE102005047265 A1 DE 102005047265A1 DE 200510047265 DE200510047265 DE 200510047265 DE 102005047265 A DE102005047265 A DE 102005047265A DE 102005047265 A1 DE102005047265 A1 DE 102005047265A1
Authority
DE
Germany
Prior art keywords
bearing
friction
base housing
radially
clamping
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Withdrawn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
DE200510047265
Other languages
German (de)
Inventor
Rainer Dipl.-Ing. Pflug
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 DE200510047265 priority Critical patent/DE102005047265A1/en
Publication of DE102005047265A1 publication Critical patent/DE102005047265A1/en
Application status is Withdrawn legal-status Critical

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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
    • F16H7/10Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1209Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means
    • F16H7/1218Means 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
    • 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
    • F16H7/10Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1281Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
    • 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
    • F16H2007/081Torsion springs

Abstract

The invention relates to a tensioning device of a traction mechanism drive, with a motor-mounted base housing (3) in which a provided with a rotatable tension pulley tension lever (2) is pivotally mounted, wherein in the pivot bearing with a clamping lever (2) rigidly connected bearing pin (6). is provided with an end bearing plate (7), one with the base housing (3) connected and rotatably mounted on the bearing axis bearing sleeve (9) has a bearing plate (7) axially adjacent bearing base (8), between the bearing plate (7) and the Bearing bottom (8) a friction ring (10) is arranged, and the base housing (3) and the clamping lever (2) via a coaxial with the bearing axis and the bearing sleeve (9) arranged coil spring (35) non-positively and positively with each other.
To increase the damping is provided that the connection of the coil spring (35) with the clamping lever (2) positively via a connected to the coil spring (35) drive plate (15) and via an axially between the drive plate (15) and the clamping lever (2 ) arranged friction element (16) with a radially outer circular arc-shaped friction surface (26) or with a radially inner circular-shaped friction surface (26 '), wherein the friction element (16) by a circumferential clamping of the drive plate (15) with the clamping lever (2 ) by a largely peripheral contact with the active surface (24) of an axially projecting driver (25) of the ...

Description

  • Territory of invention
  • The Invention relates to a tensioning device of a traction mechanism drive, with a motor-mountable base housing, in which one with a rotatable tensioner is provided pivoted clamping lever, wherein in the pivot bearing a rigidly connected to the clamping lever bearing pin with an end-side Bearing plate is provided, one connected to the base housing and on the Bearing axis rotatably mounted bearing sleeve a the bearing plate axially adjacent bearing bottom has, between the bearing plate and the Bearing bottom is arranged a friction ring, and the base housing as well the tension lever over a coaxial with the bearing axis and the bearing sleeve arranged coil spring positive and positive communicate with each other.
  • The Invention further relates to a tensioning device of a traction mechanism drive, with a motor mountable base housing, on which one with a rotatable tensioner roller provided pivot lever is pivotally mounted, wherein in the pivot bearing a rigidly connected to the base housing bearing pin is provided with an end bearing plate, one with the clamping lever connected and rotatably mounted on the bearing axis bearing sleeve a the bearing plate axially adjacent bearing bottom, between the bearing plate and the bearing bottom a friction ring is arranged, and the base housing and the clamping lever over a coaxial with the bearing axis and the bearing sleeve arranged coil spring non-positively and positively with each other keep in touch.
  • background the invention
  • jigs The aforementioned type are preferred in different versions for auxiliary drives of internal combustion engines for use and can, as indicated in the previous first paragraph, with an inner storage the clamping lever in the base housing or, as indicated in the previous second paragraph, with a outdoor storage of the clamping lever on the base housing be executed.
  • In the DE 42 24 759 C2 For example, such a clamping device is described with an inner bearing of the clamping lever, wherein a bearing pin of the pivot bearing is rigidly secured to the clamping lever and is provided at its free end with a flat bearing plate. The bearing sleeve is connected via an axially adjacent to the bearing plate arranged flat bearing base with the radially outer base housing in combination, which has on its outer circumference fastening tabs for mounting on a machine housing, such as a motor housing of an internal combustion engine. Coaxially to the bearing axis and the bearing sleeve, a helical spring between a spring plate of the clamping lever and the rear side of the bearing base of the base housing is arranged below the end form-fitting connection. The coil spring may be slightly axially biased axially for clamping a arranged between the bearing plate and the sleeve bottom circular disk-shaped friction ring, the friction ring is used in this case mainly as thrust washer for the axial mounting of the clamping lever.
  • Is possible but also a larger axial preload the coil spring, whereby an axial contact force between the Storage plate, the friction ring and the bearing base is generated at a pivoting movement of the clamping lever a friction torque result has and therefore a friction damping the pivoting movement causes. Likewise, the coil spring can be installed in Condition for springing the tension pulley on the traction means on the circumference be biased. Possible but is also a in normal position circumferentially relaxed coil spring, the first by a pivoting movement of the clamping lever in the one or other direction is stretched and thereby a corresponding Restoring moment generated.
  • A corresponding clamping device with an external bearing of the clamping lever is out of DE 100 13 978 A1 known. In this clamping device of the bearing pin is part of the base housing and provided for attachment to a machine housing with a central mounting hole. At its outer axial end, the bearing pin on a flat bearing plate, against which a circular disc-shaped friction ring bears axially inside, and adjacent to this axially opposite one formed on the clamping lever flat bearing bottom.
  • The bearing sleeve is in this case as well as the bearing base part of the clamping lever. The coil spring is coaxial with the bearing axis and the bearing sleeve below end more positive fit Connection between the back the bearing bottom of the clamping lever and an inner spring plate of the base part arranged. The mode of action of this clamping device is identical to the previously described internally mounted design.
  • Both versions have in common that the friction damping of pivotal movements of the clamping lever, in particular of torsional vibrations of the clamping lever, for some Anwendungsfäl is insufficient. For this reason, the above-described clamping devices for certain applications have been provided with hydraulic damping elements, can be effectively damped by the particularly high-frequency pivoting movements of the clamping lever. A corresponding arrangement of a hydraulic damping element is for example in the DE 100 44 125 A1 described for a clamping device with an externally mounted clamping lever. In such a design of a clamping device, however, the higher production costs and the greater space requirement have a disadvantageous effect.
  • Task of invention
  • Of the Invention is therefore based on the object, a clamping device of the type mentioned above, the cost-effective and space saving way with an increased Damping provided is.
  • Summary the invention
  • Of the Invention is based on the finding that even by a Preload and / or pivotal movement of the clamping lever conditional Torsional stress of the coil spring for radial pressing of a Friction element inwardly or outwardly to a relative to the respective Spring-end rotatable tensioner component and thus for friction damping of Swinging motion can be used.
  • The Object of the invention, the clamping device with an internally mounted Tension lever regarding is therefore in connection with the features the preamble of claim 1 according to the invention solved in that the connection of the coil spring with the clamping lever via a form-fitting with the coil spring connected drive plate and over a arranged axially between the drive plate and the clamping lever Friction element with a radially outer circular friction surface or with a radially inner circular-shaped friction surface, wherein the friction element by a circumferential clamping of the Drive plate with the clamping lever by a largely peripheral Contact with the effective surface an axially projecting driver of the drive plate and with the effective area an axially protruding driver of the clamping lever with the friction surface after radially outward the inner wall of an outer cylinder or can be pressed radially inward to the outer wall of an inner cylinder, the rigid with the base housing connected is.
  • alternative For this purpose, the object of the invention, the clamping device with a internally mounted clamping lever in relation to the features the preamble of claim 2 according to the invention by the same solved, that the connection of the coil spring with the base housing form fit over a connected to the coil spring drive plate and a arranged axially between the drive plate and the base housing Friction element with a radially outer circular friction surface or with a radially inner circular-shaped friction surface, wherein the friction element by a circumferential clamping of the Drive plate with the base housing by a largely circumferential contact with the effective surface of an axially projecting Mitnehmers the drive plate and with the effective surface of a axially projecting driver of the base housing with the friction surface after radially outside to the inner wall of an outer cylinder or radially inward to the outer wall of an inner cylinder pressed is, which is rigidly connected to the clamping lever.
  • Analogous For this purpose, the object of the invention, the clamping device with a externally mounted clamping lever concerning in conjunction with the features of the preamble of Claim 3 according to the invention solved by that the connection of the coil spring with the base housing form fit over a connected to the coil spring drive plate and a arranged axially between the drive plate and the base housing Friction element with a radially outer circular arc-shaped friction surface or with a radially inner circular friction surface, wherein the friction element by a circumferential clamping of the Drive plate with the base housing by a largely circumferential contact with the effective surface of an axially projecting Mitnehmers the drive plate and with the effective surface of a axially projecting driver of the base housing with the friction surface after radially outside to the inner wall of an outer cylinder or radially inward to the outer wall an inner cylinder pressed is, which is rigidly connected to the clamping lever.
  • Next alternatively, the object of the invention, the clamping device with an externally mounted clamping lever regarding in conjunction with the features of the preamble of claim 4 according to the invention also solved in that the connection of the coil spring with the clamping lever form-fitting manner via a driving disc connected to the coil spring and an axially disposed between the drive plate and the clamping lever friction element with a radially outer circular-arc-shaped friction surface or with a radially inner circular arc-shaped Friction surface is, wherein the friction element by a circumferential clamping of the drive plate with the clamping lever by a largely peripheral contact with the active surface of an axially projecting driver of the drive plate and the effective surface of an axially projecting driver of the clamping lever with the friction surface radially outward against the inner wall of an outer cylinder or can be pressed radially inward to the outer wall of an inner cylinder, which is rigidly connected to the base housing.
  • The Helical spring supports thus circumferentially about the drive plate and the friction element on the adjacent tensioner component (tensioning lever or base housing) from. This is done by pressing the friction element to the inner wall of the outer cylinder or to the outer wall of the inner cylinder produces a friction torque that is proportional to the Torsion tension of the coil spring is.
  • by virtue of of the relatively large Impact radius can be the friction surface the friction element and thus the axial height of the damping device according to the invention kept small. The axial height of the entire clamping device can also be kept constant in a simple manner that the coil spring corresponding to the effective axial height of the drive plate, the friction element, and the driver of the adjacent tensioner component shortened is, wherein the spring stiffness of the coil spring by the use of a stiffer spring wire can be maintained. Alternatively, it can The wire diameter of the coil spring can also be reduced since the coil spring due to the additional damping device no large axial Preload must spend more.
  • The damping device according to the invention, So the drive plate, the friction element, and the driver of the adjacent tensioner component, can both tensioners with internally mounted clamping lever as well as with clamping devices with außengelagertem Tension levers are used. The effectiveness of the friction elements can each radially outward or be formed radially inward, wherein the radially outward effective Training due to the larger working radius and the larger friction surface advantageous is.
  • Also the damping device can optionally be arranged on the lever side or on the housing side, but in each case the inner wall of the outer cylinder or the outer wall of the The inner cylinder must be connected to the tensioner component, with which the coil spring at its axially opposite end in connection is, because only then a relative rotation between the outer cylinder or the inner cylinder and the friction element and thus given a friction damping is.
  • Theoretically is even an arrangement of such a damping device possible at both ends of the coil spring. The disadvantage would be, however, that one of the two damping devices inevitably would have to be formed radially inward effective, i. with a push of the relevant friction element to the outer wall of a radially inner Internal cylinder would be provided which due to the smaller effective radius a correspondingly large friction surface or a big axial height would require and thus comparatively unfavorable would.
  • advantageous Embodiments of the clamping device according to the invention are in to the claims 4 to 17 listed.
  • In a particularly preferred embodiment of attenuator is the friction element as an angular sector segment with radially Outside formed divergent circumferential ramp surfaces. In addition, show the driver of the drive plate and the tensioner component thereby in each case a corresponding, on one of the ramp surfaces of the friction element Applicable and radially outward divergent circumferential effective area on.
  • in this connection the friction element is at a circumferential tension of the drive plate relative to the adjacent tensioner component of the drivers of these components on the oblique effective surfaces radially outward and thus with its radially outer friction surface against the inner wall of the outer cylinder pressed. The friction torque generated in this way and the desired damping characteristic is over the angle of inclination of the ramp surfaces of the friction element and the active surfaces the driver of the drive plate and the tensioner component adjustable. An adaptation to different applications can therefore simple way by different inclination angle of the ramp and active surfaces be achieved. With an effectiveness of the friction element radially inside are the ramp surfaces of the friction element and the active surfaces the driver of the drive plate and the tensioner component accordingly formed divergent radially inward.
  • Although a comparable tensioning device with an outer bearing of a clamping lever designed as a stub shaft is known from the EP 0 608 607 B1 known. In this clamping device, however, the coil spring is designed as a pure torsion spring and axially supported on one side on a drive plate, the axial recesses with circumferentially inclined ramp surfaces and in this engaging cam a housing fixed disc with an anchor plate is in communication. In this case, the resulting from the pivotal position of the clamping lever circumferential clamping force of the coil spring is converted into an axial contact force associated friction plates and thus achieves a rotational angle-dependent friction damping.
  • adversely However, in this design, the relatively small effective radius of the friction torque, by the to achieve a certain friction torque increased contact pressure and a larger friction surface required are. Furthermore, there is a risk of stalling of the clamping lever, whereby the pivoting range of the clamping lever is limited.
  • at the tensioning device according to the invention can at a circumferentially bias-free arrangement the clamping lever also on both sides of the friction element in each case a driver for a Einwärtsschwenken the clamping lever and circumferentially opposite a driver for an outward pivoting of the clamping lever with corresponding active surfaces on the drive plate and on the tensioner component and corresponding ramp surfaces be provided to the friction element, wherein by different inclination angle of ramped surfaces the friction element and the associated active surfaces of the driver different damping properties when swiveling inward Clamping levers (towards the traction means) and when pivoting outwards of the clamping lever (away from the traction means) can be realized.
  • In a further preferred embodiment of attenuator according to the invention is the friction element as a circular ring segment with largely radially-parallel extending circumferential side surfaces formed, and the driver the drive plate and the tensioner component each have one corresponding, abutting one of the side surfaces of the friction element radially parallel peripheral effective surface on. In this case will a circumferential spring tension of the coil spring in an elastic Deformation of the arcuate Friction element implemented, whereby the radially outer friction surface of Friction element largely radially to the inner wall of the outer cylinder pressed becomes.
  • According to one other possible embodiment the damping device is provided that the friction element as a crescent-shaped circular arc wedge segment with a rounded stop wall at the wedge end and a radially inner concave circular arc Inner wall is formed, and that one of the drivers of the drive plate or the Spannerbauteils umfansgseitig a U-shaped effective surface for Pick up the rounded stop wall and the other catch one radially outboard, corresponding circular arc convex effective area for sliding guidance having the inner wall of the friction element. In this embodiment causes a circumferential spring tension of the coil spring one to the wedge tip directed tangential rotation of the friction element around the center the arcuate effective area of a driver, whereby the friction element due to its wedge shape with its radially outer friction surface in a tangential-radial Movement is pressed against the inner wall of the outer cylinder.
  • In a similar one execution the friction element is a sickle-shaped arcuate secant segment with a radially outwardly divergently beveled stop wall and a radially inner secant plane aligned Inner wall formed, and one of the driver of the drive plate or the tensioner component has a divergent radially outward Beveled effective surface for Apply to the stop wall of the friction element, and the other driver a corresponding secant aligned, radially outer level effective area for sliding guidance the inner wall of the friction element. In this case, a circumferential Spring tension of the coil spring in a directed towards the wedge tip tangential Displacement in conjunction with an outward rotation of the Frictional element implemented around the wedge tip, through which the friction element with its radially outer friction surface to the inner wall of the outer cylinder pressed becomes.
  • to Circumferential distribution of the effective frictional force are advantageous several friction elements and a corresponding number of drivers on the drive plate and arranged circumferentially equally distributed on the tensioner component. To simplify the assembly, the friction elements are expediently tangential Connecting webs in connection with each other, wherein the webs as elastic spring elements may be formed, which in operation for resetting serve the friction elements, or each having a predetermined breaking point can, which break in operation and an independent movement of the Allow friction elements.
  • The existing on the drive plate and the adjoining tensioner component between the drivers and the friction elements on the axial side sliding surfaces may be radially formed flat. However, it is advantageous to form these sliding surfaces relative to an imaginary central radial surface radially outwardly conically divergent, since the drive plate is radially centered thereby without a reduction of the friction surfaces of the friction elements and thus can be dispensed with an otherwise required radial bearing of the drive plate. Occurring radial bearing forces are in the sem case also implemented in friction between the pressure-side friction elements and the outer cylinder and thus increase the friction damping.
  • To this purpose, the increase the friction damping via radial Bearing forces, can also be the axial bearing over the friction ring to increase the friction damping be used by the bearing plate, the bearing bottom, and the intervening arranged friction ring, usually a circular disk are formed with a coaxial conical contour be provided, whereby the corresponding radial bearing omitted can be. Alternatively, this can also be the friction ring with a be provided in the profile cross section axially one-sided spline, with the spline in a corresponding annular groove of the storage floor or the bearing plate are rotatably guided, and with the opposite Axial side slidable on the other component (bearing plate or bearing bottom) be attached.
  • Short description the drawings
  • The The invention will be described below with reference to the accompanying drawings some embodiments explained in more detail. In this shows
  • 1 a first embodiment of a clamping device with a damping device in an exploded view,
  • 2 the execution of the tensioning device after 1 in a radial middle section,
  • 3 the operation of the damping device of the clamping device according to 1 and 2 in an axial partial view,
  • 4 Structure and mode of action of a further design of a damping device in an axial partial view,
  • 5 Structure and mode of action of a further design of a damping device in an axial partial view,
  • 6 Structure and mode of action of a further design of a damping device in an axial partial view,
  • 7a a first development of the clamping device according to 1 to 3 in a radial middle section,
  • 7b a second development of the clamping device according to 1 to 3 in a radial middle section,
  • 8th a first embodiment of a damping device in a clamping device with an externally mounted clamping lever in a sectional view,
  • 9 a second embodiment of a damping device in the clamping device according to 8th in a sectional view,
  • 10 a third embodiment of a damping device in the clamping device according to 8th in a sectional view, and
  • 11 a fourth embodiment of a damping device in the clamping device according to 8th in a sectional view.
  • detailed Description of the drawings
  • In an embodiment of a tensioning device according to the invention 1 a traction mechanism according to 1 to 3 is a tension lever 2 with an inner bearing pivoting in a base housing 3 stored. The tension lever 2 has a mounting hole 4 for attaching a rotatable tensioner and the base housing 3 mounting tabs 5 for mounting the clamping device 1 on a machine housing.
  • The tension lever 2 is about a bearing pin 6 with an axially opposite flat bearing plate 7 connected. The base housing 3 points to the bearing plate 7 facing side a storage floor 8th on, on which an inner bearing sleeve 9 attached or formed.
  • When assembled, the tension lever is 2 over one between the storage plate 7 and the storage floor 8th arranged circular disk-shaped friction ring 10 axially and one between the bearing pin 6 and the bearing sleeve 9 arranged plain bearing bush 11 radially mounted. Here are the cocking lever 2 and the base housing 3 over one inside the outer cylinder 12 of the base housing 3 coaxial with the bearing pin 6 and the bearing sleeve 9 arranged (not shown) coil spring at least axially braced. For this purpose, the coil spring is tellerseitg on the inside 13 of the storage floor 8th and lever side on the inside 14 a drive disc 15 axially supported, with the insides 13 . 14 are contoured for transmitting a torsional moment on or from the coil spring. Between the drive plate 15 and the tension lever 2 are in an annular arrangement a plurality of friction elements 16 arranged, which over tangential connecting webs 17 connected to each other.
  • How special in 2 can be seen, are the clamping lever 2 , the friction elements 16 and the driver disc 15 each with axial sliding surfaces 18 . 19 . 20 in contact with each other, which are formed relative to an imaginary middle Ra dialfläche radially outwardly tapered divergent. This is the drive plate 15 guided radially and thus requires no special radial bearing for storage on the bearing pin 6 (floating storage).
  • Especially in 3 is shown, the friction elements 16 in the axial projection in each case as an angle sector segment with radially outwardly divergent peripheral ramp surfaces 21 formed, the peripherally each with the corresponding oblique effective surface 22 a driver 23 of the clamping lever 2 and circumferentially opposite with the corresponding oblique effective surface 24 a driver 25 the drive disc 15 are in operative contact. As a result, the friction elements 16 at a circumferential tension of the clamping lever 2 opposite the drive plate 15 radially outward and with its outer friction surface 26 against the inner wall 27 of the outer cylinder 12 of the base housing 3 pressed, causing the pivoting movements of the clamping lever 2 be effectively damped by friction.
  • In another possible design of such a damping device according to 4 is the friction element 16 ' as a circular ring segment with largely radially-parallel peripheral side surfaces 28 trained, and the drivers 23 ' . 25 ' of the clamping lever 2 or the drive plate 15 each have a corresponding one on one of the side surfaces 28 of the friction element 16 ' Applicable radial-parallel circumferential effective surface 22 ' . 24 ' on. In this embodiment of the invention, a circumferential spring tension of the coil spring in an elastic deformation of the arcuate friction element 16 ' implemented, whereby the radially outer friction surface 26 of the friction element 16 ' largely radially to the inner wall 27 of the outer cylinder 12 is pressed
  • In a further variant of such a damping device according to 5 is the friction element 16 ' as a sickle-shaped circular arc wedge segment with a rounded stop wall 29 at the wedge end, and a radially inner concave circular arc-shaped inner wall 30 educated. The taker 23 ' of the clamping lever 2 has circumferentially a cross-sectionally U-shaped effective surface 22 ' for receiving the rounded stop wall 29 , and the driver 25 ' the drive disc 15 a radially outer, corresponding circular arc-convex active surface 24 ' for sliding the inner wall 30 of the friction element 16 ' on.
  • In this embodiment, a circumferential spring tension of the coil spring causes a wedge tip 31 directed tangential rotation of the friction element 16 ' around the center of the arcuate effective surface 24 ' of the driver 25 ' the drive disc 15 , whereby the friction element 16 ' due to its wedge shape with its radially outer friction surface 26 in a tangential-radial movement to the inner wall 27 of the outer cylinder 12 is pressed.
  • In a further, similar variant of a damping device according to 6 is the friction element 16 ' as a sickle-shaped arc secant segment with an end radially outwardly divergently beveled stop wall 29 ' and a radially inner secant-oriented planar inner wall 30 ' educated. The driver 23 ' of the clamping lever 2 has a radially outwardly divergently beveled effective surface 22 ' for attachment to the stop wall 29 ' of the friction element 16 ' on, as well as the driver 25 ' the drive disc 15 a corresponding secant-oriented, radially outer plane effective surface 24 ' for sliding the inner wall 30 ' of the friction element 16 ' ,
  • In this variant, a circumferential spring tension of the coil spring in a wedge tip 31 ' directed tangential displacement in conjunction with an outward rotation of the friction element 16 ' around the wedge tip 31 ' implemented by the friction element 16 ' with its radially outer friction surface 26 to the inner wall 27 of the outer cylinder 12 is pressed depressing.
  • To further increase the friction damping are in a modification of the embodiment according to 2 in a tensioning device 1' the storage plate 7 ' , the warehouse floor 8th' and the interposed friction ring 10 ' Axiallagerung, as in the half-page representation of 7a is illustrated provided with a coaxial conical contour. This allows the bearing sleeve 9 and the plain bearing bush 11 omitted, and occurring radial bearing forces are at a pivoting movement of the clamping lever 2 implemented in friction and thus additionally increases the damping of the pivoting movement.
  • As in the half-page illustration of 7b is shown, this can also be alternatively the friction ring 10 ' with an axially one-sided wedge profile 32 be provided with the spline 32 in a corresponding annular groove 33 of the bearing plate 7 ' rotatably guided and with the opposite axial side 34 Slidable on the storage floor 8th' be attached. Also in this embodiment occurring radial bearing forces in a pivoting movement of the clamping lever 2 implemented in friction and thereby the friction damping of the tensioning device 1' elevated.
  • To illustrate the possible arrangements of the above-described damping devices is in the 8th to 11 on a tensioning device 1 with one on a base housing 3 externally mounted clamping lever 2 by way of example in each case a damping device with friction elements 16 according to the design according to 1 to 3 shown in a different arrangement.
  • In the embodiment according to 8th is the damping device on the bearing plate 7 and the storage floor 8th opposite side of the coil spring 35 arranged. The coil spring 35 stands over a drive disc 15 and over axially between the drive plate 15 and one with the bearing pin 6 of the base housing 3 connected bearing disc 36 arranged friction elements 16 with the base housing 3 in connection. The friction elements 16 are designed to be effective radially outward and this with a radially outer circular arc-shaped friction surface 26 Mistake. By a circumferential clamping of the drive plate 15 with the base housing 3 become the friction elements 16 by a contact with not shown carriers of the drive plate 15 and the bearing disc 36 with their friction surfaces 26 radially outward to the inner wall 27 an outer cylinder 12 pressed down, the rigid with the clamping lever 2 connected is.
  • In the embodiment according to 9 the damping device is also on the bearing plate 7 and the storage floor 8th opposite side of the coil spring 35 arranged. Now the friction elements 16 However, designed to be effective radially inward and this with a radially inner circular-shaped friction surface 26 ' Mistake. In this case, the friction elements 16 by a circumferential clamping of the drive plate 15 with the base housing 3 by a contact with not shown carriers of the drive plate 15 and the bearing disc 36 with their friction surfaces 26 ' radially inward to the outer wall 27 ' an inner cylinder 12 ' pressed in this embodiment by the rigid with the clamping lever 2 connected bearing sleeve 9 is formed.
  • In contrast to the previously described embodiments, the damping device in the variant according to 10 on the storage plate 7 and the storage floor 8th adjacent side of the coil spring 35 arranged. The coil spring 35 is now on a drive disc 15 and over axially between the drive plate 15 and one with the cocking lever 2 connected bearing disc 36 ' arranged friction elements 16 with the clamping lever 2 in connection. The friction elements 16 are designed to be effective radially outward and this with a radially outer circular arc-shaped friction surface 26 Mistake. By a circumferential clamping of the drive plate 15 with the clamping lever 2 become the friction elements 16 by a contact with not shown carriers of the drive plate 15 and the present with the storage floor 8th identical bearing disc 36 ' with their friction surfaces 26 radially outward to the inner wall 27 an outer cylinder 12 pressed down, the rigid with the base housing 3 connected is.
  • In the embodiment of the 11 the damping device is also on the bearing plate 7 and the storage floor 8th adjacent side of the coil spring 35 arranged. Now the friction elements 16 However, designed to be effective radially inward and this with a radially inner circular-shaped friction surface 26 ' Mistake. In this case, the friction elements 16 by a circumferential clamping of the drive plate 15 with the clamping lever 2 by a contact with not shown carriers of the drive plate 15 and the bearing disc 36 ' with their friction surfaces 26 ' radially inward to the outer wall 27 ' an inner cylinder 12 ' pressed in this embodiment by the rigid with the base housing 3 connected bearing pin 6 is formed.
  • 1
    jig
    1'
    jig
    2
    clamping lever
    3
    base housing
    4
    mounting hole
    5
    mounting tab
    6
    bearing bolt
    7
    bearing plate
    7 '
    bearing plate
    8th
    bearing housing
    8th'
    bearing housing
    9
    bearing sleeve
    10
    friction ring
    10 '
    friction ring
    11
    plain bearing bush
    12
    outer cylinder
    12 '
    inner cylinder
    13
    Inside (from 8th . 8th' )
    14
    Inside (from 15 )
    15
    driver disc
    16
    friction
    16 '
    friction
    17
    connecting web
    18
    Axial-side sliding surface (from 2 )
    19
    Axial-side sliding surface (from 16 )
    20
    Axial-side sliding surface (from 15 )
    21
    Ramp surface (from 16 )
    22
    Effective area (from 23 )
    22 '
    Effective area (from 23 ' )
    23
    Carrier (from 2 )
    23 '
    Carrier (from 2 )
    24
    Effective area (from 25 )
    24 '
    Effective area (from 25 ' )
    25
    Carrier (from 15 )
    25 '
    Carrier (from 15 )
    26
    Friction surface (from 16 . 16 ' )
    26 '
    Friction surface (from 16 )
    27
    Interior wall (from 12 )
    27 '
    Outer wall (from 12 ' )
    28
    Side surface (from 16 ' )
    29
    Stop wall (from 16 ' )
    29 '
    Stop wall (from 16 ' )
    30
    Interior wall (from 16 ' )
    30 '
    Interior wall (from 16 ' )
    31
    Keilspitze
    31 '
    Keilspitze
    32
    spline
    33
    ring groove
    34
    axial
    35
    coil spring
    36
    bearing disk
    36 '
    bearing disk

Claims (17)

  1. Clamping device of a traction mechanism drive, with a motor-mounted base housing ( 3 ), in which a clamping lever provided with a rotatable tensioning roller ( 2 ) is pivotally mounted, wherein in the pivot bearing with the clamping lever ( 2 ) rigidly connected bearing pin ( 6 ) with an end bearing plate ( 7 ), one with the base housing ( 3 ) and rotatably mounted on the bearing axis bearing sleeve ( 9 ) a the bearing plate ( 7 ) axially adjacent bearing bottom ( 8th ), between the bearing plate ( 7 ) and the storage floor ( 8th ) a friction ring ( 10 ), and the base housing ( 3 ) as well as the tension lever ( 2 ) via a coaxial to the bearing axis and the bearing sleeve ( 9 ) arranged coil spring ( 35 ) in a positive and positive connection with each other, characterized in that the connection of the helical spring ( 35 ) with the clamping lever ( 2 ) positively via a with the coil spring ( 35 ) associated drive disc ( 15 ) and via an axially between the drive plate ( 15 ) and the tensioning lever ( 2 ) arranged friction element ( 16 ) with a radially outer circular-arc-shaped friction surface ( 26 ) or with a radially inner circular-shaped friction surface ( 26 ' ), wherein the friction element ( 16 ) by a circumferential clamping of the drive plate ( 15 ) with the clamping lever ( 2 ) by a largely peripheral contact with the active surface ( 24 ) of an axially protruding driver ( 25 ) of the drive plate ( 15 ) as well as with the effective area ( 22 ) of an axially protruding driver ( 23 ) of the clamping lever ( 2 ) with the friction surface ( 26 . 26 ' ) radially outward against the inner wall ( 27 ) of an outer cylinder ( 12 ) or radially inward to the outer wall ( 27 ' ) of an inner cylinder ( 12 ' ) which is rigid with the base housing ( 3 ) connected is.
  2. Clamping device of a traction mechanism drive, with a motor-mounted base housing ( 3 ), in which a clamping lever provided with a rotatable tensioning roller ( 2 ) is pivotally mounted, wherein in the pivot bearing with the clamping lever ( 2 ) rigidly connected bearing pin ( 6 ) with an end bearing plate ( 7 ), one with the base housing ( 3 ) and rotatably mounted on the bearing axis bearing sleeve ( 9 ) a the bearing plate ( 7 ) axially adjacent bearing bottom ( 8th ), between the bearing plate ( 7 ) and the storage floor ( 8th ) a friction ring ( 10 ), and the base housing ( 3 ) as well as the tension lever ( 2 ) via a coaxial to the bearing axis and the bearing sleeve ( 9 ) arranged coil spring ( 35 ) in a positive and positive connection with each other, characterized in that the connection of the helical spring ( 35 ) with the base housing ( 3 ) positively via a with the coil spring ( 35 ) associated drive disc ( 15 ) and via an axially between the drive plate ( 15 ) and the base housing ( 3 ) arranged friction element ( 16 ) with a radially outer circular-arc-shaped friction surface ( 26 ) or with a radially inner circular-shaped friction surface ( 26 ' ), wherein the friction element ( 16 ) by a circumferential clamping of the drive plate ( 15 ) with the base housing ( 3 ) by a largely peripheral contact with the active surface ( 24 ) of an axially protruding driver ( 25 ) of the drive plate ( 15 ) as well as with the effective area ( 22 ) of an axially protruding driver ( 23 ) of the base housing ( 3 ) with the friction surface ( 26 . 26 ' ) radially outward against the inner wall ( 27 ) of an outer cylinder ( 12 ) or radially inward to the outer wall ( 27 ' ) of an inner cylinder ( 12 ' ) is pressed, the rigid with the clamping lever ( 2 ) connected is.
  3. Clamping device of a traction mechanism drive, with a motor-mounted base housing ( 3 ), on which a tensioning lever provided with a rotatable tensioning roller ( 2 ) is pivotally mounted, wherein in the pivot bearing with the base housing ( 3 ) rigidly connected bearing pin ( 6 ) with an end bearing plate ( 7 ), one with the clamping lever ( 2 ) and rotatably mounted on the bearing axis bearing sleeve ( 9 ) a the bearing plate ( 7 ) axially adjacent bearing bottom ( 8th ), between the bearing plate ( 7 ) and the storage floor ( 8th ) a friction ring ( 10 ), and the base housing ( 3 ) as well as the tension lever ( 2 ) via a coaxial to the bearing axis and the bearing sleeve ( 9 ) arranged coil spring ( 35 ) are frictionally and frictionally in communication with each other, characterized in that the connection of the coil spring ( 35 ) with the base housing ( 3 ) positively via a with the coil spring ( 35 ) associated drive disc ( 15 ) and via an axially between the drive plate ( 15 ) and the base housing ( 3 ) arranged friction element ( 16 ) With a radially outer circular-arc-shaped friction surface ( 26 ) or with a radially inner circular-shaped friction surface ( 26 ' ), wherein the friction element ( 16 ) by a circumferential clamping of the drive plate ( 15 ) with the base housing ( 3 ) by a largely peripheral contact with the active surface ( 24 ) of an axially protruding driver ( 25 ) of the drive plate ( 15 ) as well as with the effective area ( 22 ) of an axially protruding driver ( 23 ) of the base housing ( 3 ) with the friction surface ( 26 . 26 ' ) radially outward against the inner wall ( 27 ) of an outer cylinder ( 12 ) or radially inward to the outer wall ( 27 ' ) of an inner cylinder ( 12 ' ) is pressed, the rigid with the clamping lever ( 2 ) connected is.
  4. Clamping device of a traction mechanism drive, with a motor-mounted base housing ( 3 ), on which a tensioning lever provided with a rotatable tensioning roller ( 2 ) is pivotally mounted, wherein in the pivot bearing with the base housing ( 3 ) rigidly connected bearing pin ( 6 ) with an end bearing plate ( 7 ), one with the clamping lever ( 2 ) and rotatably mounted on the bearing axis bearing sleeve ( 9 ) a the bearing plate ( 7 ) axially adjacent bearing bottom ( 8th ), between the bearing plate ( 7 ) and the storage floor ( 8th ) a friction ring ( 10 ), and the base housing ( 3 ) as well as the tension lever ( 2 ) via a coaxial to the bearing axis and the bearing sleeve ( 9 ) arranged coil spring ( 35 ) in a positive and positive connection with each other, characterized in that the connection of the helical spring ( 35 ) with the clamping lever ( 2 ) positively via a with the coil spring ( 35 ) associated drive disc ( 15 ) and via an axially between the drive plate ( 15 ) and the tensioning lever ( 2 ) arranged friction element ( 16 ) with a radially outer circular-arc-shaped friction surface ( 26 ) or with a radially inner circular-shaped friction surface ( 26 ' ), wherein the friction element ( 16 ) by a circumferential clamping of the drive plate ( 15 ) with the clamping lever ( 2 ) by a largely peripheral contact with the active surface ( 24 ) of an axially protruding driver ( 25 ) of the drive plate ( 15 ) as well as with the effective area ( 22 ) of an axially protruding driver ( 23 ) of the clamping lever ( 2 ) with the friction surface ( 26 . 26 ' ) radially outward against the inner wall ( 27 ) of an outer cylinder ( 12 ) or radially inward to the outer wall ( 27 ' ) of an inner cylinder ( 12 ' ) which is rigid with the base housing ( 3 ) connected is.
  5. Clamping device according to one of claims 1 to 4, characterized in that the friction element ( 16 ) as an angular sector segment with radially divergent circumferential ramp surfaces ( 21 ) and that the drivers ( 25 ) of the drive plate ( 15 ) and the drivers ( 23 ) of the adjoining tensioner component ( 2 . 3 ) in each case a corresponding, on one of the ramp surfaces ( 21 ) of the friction element ( 16 ) can be applied, radially divergent circumferential effective area ( 24 . 22 ) exhibit.
  6. Clamping device according to claim 5, characterized in that at a circumferentially bias-free arrangement of the clamping lever ( 2 ) on both sides of the friction element ( 16 ) one driver each ( 25 . 23 ) for an inward pivoting of the clamping lever ( 2 ) and circumferentially opposite a driver ( 25 . 23 ) for an outward pivoting of the clamping lever ( 2 ) with corresponding active surfaces ( 24 . 22 ) on the drive plate ( 15 ) and on the tensioner component ( 2 . 3 ) are arranged.
  7. Clamping device according to claim 3, characterized in that the ramp surfaces ( 21 ) of the friction element ( 16 ) and the active surfaces ( 24 . 22 ) the driver ( 25 . 23 ) on the pressure side for an inward pivoting of the clamping lever ( 2 ) and on the pressure side for an outward pivoting of the clamping lever ( 2 ) have different inclination angles.
  8. Clamping device according to one of claims 1 to 4, characterized in that the friction element ( 16 ' ) as a circular ring segment with largely radially-parallel peripheral side surfaces ( 28 ) and that the drivers ( 25 ' . 23 ' ) of the drive plate ( 15 ) and the tensioner component ( 2 . 3 ) in each case a corresponding one on one of the side surfaces ( 28 ) of the friction element ( 16 ' ) can be applied radial-parallel circumferential effective area ( 24 ' . 22 ' ) exhibit.
  9. Clamping device according to one of claims 1 to 4, characterized in that the friction element ( 16 ' ) as a sickle-shaped circular arc wedge segment with a rounded stop wall ( 29 ) at the wedge end and a radially inner circular arc-shaped concave inner wall ( 30 ) and that one of the drivers ( 25 ' ) of the drive plate ( 15 ) or the tensioner component circumferentially a U-shaped effective surface ( 24 ' ) for receiving the rounded stop wall ( 29 ), and the other driver ( 23 ' ) a radially outer, corresponding circular arc-shaped convex effective surface ( 22 ' ) for sliding the inner wall ( 30 ) of the friction element ( 16 ' ) having.
  10. Clamping device according to one of claims 1 to 4, characterized in that the friction element ( 16 ' ) as a crescent-shaped arc secant segment with an end radially outwardly divergently beveled stop wall ( 29 ' ) and a radially inner secant-oriented flat inner wall ( 30 ' ) and that one of the drivers ( 25 ' ) of the drive plate ( 15 ) or the tensioner component circumferentially one radially outwardly divergently beveled effective surface ( 24 ' ) for attachment to the stop wall ( 29 ' ) of the friction element ( 16 ' ) and the other driver ( 23 ' ) a radially outer, corresponding secant-oriented flat effective surface ( 22 ' ) for sliding the inner wall ( 30 ' ) of the friction element ( 16 ' ) having.
  11. Clamping device according to at least one of claims 1 to 10, characterized in that a plurality of friction elements ( 16 ) and accordingly many drivers ( 25 . 23 ) on the drive plate ( 15 ) and on the tensioner component ( 2 . 3 ) are arranged circumferentially equally distributed.
  12. Clamping device according to claim 11, characterized in that the friction elements ( 16 ) by tangential connecting webs ( 17 ) are interconnected.
  13. Clamping device according to claim 12, characterized in that the connecting webs ( 17 ) are formed as elastic spring elements.
  14. Clamping device according to claim 12, characterized in that the connecting webs ( 17 ) each have a predetermined breaking point.
  15. Clamping device according to one of claims 1 to 14, characterized in that the axial-side sliding surfaces ( 18 . 19 . 20 ) between the drive plate ( 15 ) and the friction element ( 16 ) and between the tensioner component ( 2 . 3 ) and the friction element ( 16 ) are formed relative to an imaginary central radial surface radially outward or radially inwardly conically divergent.
  16. Clamping device according to one of claims 1 to 15, characterized in that the bearing plate ( 7 ' ), the storage floor ( 8th' ), and the interposed friction ring ( 10 ' ) have a coaxial conical contour.
  17. Clamping device according to one of claims 1 to 15, characterized in that the friction ring ( 10 ' ) a profile cross section with an axially one-sided spline ( 32 ), with this spline ( 32 ) in a corresponding annular groove ( 33 ) of the storage floor ( 8th' ) or the bearing plate ( 7 ' ) is rotatably guided, and with the opposite axial side ( 34 ) sliding against the other component (bearing plate ( 7 ' ) or storage floor ( 8th' )) is attached.
DE200510047265 2005-10-01 2005-10-01 Clamping device for use in traction mechanism drive, has friction unit pressed with friction surfaces towards outward at inner wall of external cylinder and/or towards inward at outer wall of inner cylinder Withdrawn DE102005047265A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200510047265 DE102005047265A1 (en) 2005-10-01 2005-10-01 Clamping device for use in traction mechanism drive, has friction unit pressed with friction surfaces towards outward at inner wall of external cylinder and/or towards inward at outer wall of inner cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510047265 DE102005047265A1 (en) 2005-10-01 2005-10-01 Clamping device for use in traction mechanism drive, has friction unit pressed with friction surfaces towards outward at inner wall of external cylinder and/or towards inward at outer wall of inner cylinder

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006044178A1 (en) * 2006-09-15 2008-03-27 Schaeffler Kg Clamping device for a traction mechanism drive
DE102006054963A1 (en) * 2006-11-22 2008-05-29 Schaeffler Kg Clamping device of a traction mechanism drive
WO2009106180A1 (en) * 2008-02-28 2009-09-03 Schaeffler Kg Friction and damping element with integrated sealing lip
JP2009257570A (en) * 2008-01-30 2009-11-05 Tomokazu Ishida Automatic tensioner

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4325424C1 (en) * 1993-07-29 1995-02-02 Continental Ag Device for tensioning drive belt
EP0780598A1 (en) * 1995-12-18 1997-06-25 The Gates Corporation d/b/a/ The Gates Rubber Company Damping mechanism for a tensioner
DE69802448T2 (en) * 1997-03-21 2002-07-11 Gates Rubber Co tensioner
US20030119615A1 (en) * 2001-12-20 2003-06-26 Meckstroth Richard J. Unidirectional motion asymmetric damped tensioner
JP2003222211A (en) * 2002-01-30 2003-08-08 Mitsuboshi Belting Ltd Auto-tensioner
WO2004033933A1 (en) * 2002-10-10 2004-04-22 The Gates Corporation Tensioner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4325424C1 (en) * 1993-07-29 1995-02-02 Continental Ag Device for tensioning drive belt
EP0780598A1 (en) * 1995-12-18 1997-06-25 The Gates Corporation d/b/a/ The Gates Rubber Company Damping mechanism for a tensioner
DE69802448T2 (en) * 1997-03-21 2002-07-11 Gates Rubber Co tensioner
US20030119615A1 (en) * 2001-12-20 2003-06-26 Meckstroth Richard J. Unidirectional motion asymmetric damped tensioner
JP2003222211A (en) * 2002-01-30 2003-08-08 Mitsuboshi Belting Ltd Auto-tensioner
WO2004033933A1 (en) * 2002-10-10 2004-04-22 The Gates Corporation Tensioner

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006044178A1 (en) * 2006-09-15 2008-03-27 Schaeffler Kg Clamping device for a traction mechanism drive
DE102006054963A1 (en) * 2006-11-22 2008-05-29 Schaeffler Kg Clamping device of a traction mechanism drive
JP2009257570A (en) * 2008-01-30 2009-11-05 Tomokazu Ishida Automatic tensioner
WO2009106180A1 (en) * 2008-02-28 2009-09-03 Schaeffler Kg Friction and damping element with integrated sealing lip

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