• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    TENSIONER WITH EXPANSIVE SPRING FOR ASYMMETRIC DAMPING OF RADIAL FRICTION. The present invention relates to a tensioner that can be part of a power system where the tensioner provides a tension for an endless power transmission element such as a belt, chain, or other continuous loop. The tensioner has an arm that is rotatable around a first geometric axis and includes an arm tree that has a slit through it, a bushing that has a protrusion and being positioned adjacent to the arm tree with the protrusion received inside the slit of the arm shaft, and a spring attached to the arm that forces the arm to rotate around the first geometry axis in tensioning coupling with a power transmission element. The spring is positioned where it can expand radially in contact with the bushing protrusion as the arm is rotated in a direction opposite to the tensioning coupling direction so that the bushing is forced radially outwardly in relation to the arm tree to provide the friction damping.
    公开号:BR112013005048B1
    申请号:R112013005048-9
    申请日:2011-08-03
    公开日:2020-12-01
    发明作者:Joshua J.B. Ferguson；Antthony E. Lannutti
    申请人:Dayco Ip Holdings, Llc；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention generally relates to tensioners and more specifically to an asymmetrically damped tensioner that uses an expansion spring to provide radial friction damping. BACKGROUND OF THE INVENTION
    [002] It is common for a tensioner such as a belt tensioner to have a means to cushion the movement of the tension arm caused by the fluctuation of belt tension. The magnitude required for this damping depends on many driving factors including geometry, accessory loads, accessory inertia, motor active cycle and others. For example, drive systems that have a higher torsional input or certain dynamic transient conditions may require higher damping to sufficiently control the tensioner movement. Although higher damping is very effective in controlling arm movement, it can also be detrimental to other critical tensioner functions (for example, slow or no response to loose belt conditions). In addition, a variation or change in damping that occurs as a result of variations in manufacturing, operating temperature and component breakage or wear can also cause the tensioner to be unresponsive.
    [003] Timing belt systems have benefited from the use of asymmetric damping to solve this problem. An asymmetrically cushioned tensioner provides cushioning when additional belt tension is encountered, but is free to respond to loose belt conditions. Although asymmetric functionality may not be required for all other front end accessory drive tensioners, the potential for increased service life, solving other transient dynamic system problems including belt slippage, or simply making the tensioner less sensitive to Damping variation makes it a desirable design option.
    [004] Many belt tensioner damping mechanisms that use friction damping use axial forces to move the tensioner components to create the frictional force that causes damping. These designs tend to require a means to contain axial force and some components of the belt tensioner must be more robust to withstand axial force over the life of the tensioner. SUMMARY
    [005] One aspect of the tensioners described is a modality of tensioner where the radial damping force can be contained within a support wall instead of being based on joints. Radial damping is preferably asymmetric.
    [006] In one embodiment, a tensioner is described that can be part of a power system where the tensioner provides a tension for an endless power transmission element such as a belt, chain, or other continuous loop. The tensioner has an arm that is rotatable around a first geometric axis and includes an arm tree that has a slit through it, a bushing that has a protrusion and being positioned adjacent to the arm tree with the protrusion received inside the slit of the arm shaft, and a spring attached to the arm that forces the arm to rotate around the first geometry axis in tensioning coupling with a power transmission element. The spring is positioned where it can expand radially in contact with the bushing protrusion as the arm is rotated in a direction opposite to the tensioning coupling direction so that the bushing is forced radially outwardly in relation to the arm tree to provide the friction damping.
    [007] In another embodiment, the tensioner includes a support member that houses the spring, the arm tree, and the bush with the bush adjacent to the support member and the arm tree between the spring and the bush. Consequently, when the spring is expanded radially this forces the bushing in friction coupling with the support member to provide friction damping.
    [008] The bushing can include a longitudinal slot through it that allows the radial expansion of the bushing in response to the radial expansion of the spring. In one embodiment the bushing includes a substantially cylindrical sleeve that has the longitudinal slit in it and has at least one protuberance on its internal surface. The bushing may also have a flange that extends out of one end of its sleeve.
    [009] The arm shaft of the arm preferably has a fixed diameter so that the arm shaft does not respond to the radial expansion of the spring. Instead, only the bushing is expanded radially by the expansion spring. The tensioner may also include a cover that closes the spring inside the tensioner.
    [0010] In one embodiment, the arm includes a rotating pulley mounted around a second geometric axis, the second geometric axis being spaced from and parallel to the first geometric axis.
    [0011] In another embodiment, a tensioner is described and can be part of a power system where the tensioner provides tension for an endless power transmission element. The tensioner includes a support member comprising an axis defining a first geometry axis, an arm comprising an arm tree mounted on the axis for rotational movement of the arm around the first geometric axis. The arm tree defines a cavity that has at least one slot opening in it. The tensioner also includes a bushing between the support member and the arm. The bushing includes a protuberance, which is received inside the slot of the arm shaft. In addition, the tensioner has a spring received inside the cavity of the arm tree and attached to the arm. The spring forces or tensions the arm to rotate around the first geometry axis in tensioning coupling with a power transmission element. The spring is also positioned to expand radially in contact with the bushing protrusion as the arm is rotated in a direction opposite to the tensioning coupling direction so that the bushing is forced radially to form in relation to the friction coupling arm tree with the support member to provide friction damping. BRIEF DESCRIPTION OF THE DRAWINGS
    [0012] FIG.1 is a front view of an engine which uses a tensioner modality.
    [0013] FIG.2 is an exploded perspective view of a tensioner modality.
    [0014] FIG.3 is a side cross-sectional view of the tensioner of FIG.1 taken along line 3-3.
    [0015] FIG.4 is a cross-sectional view of the tensioner of FIG.3 taken along line 4-4.
    [0016] FIG.5 is a cross-sectional view of an embodiment of a tensioner showing the underside of the cover connected with the arm, the articulation shaft, and the spring.
    [0017] FIG.6 is a bottom side perspective view of the cap of FIG.5. DETAILED DESCRIPTION
    [0018] The following detailed description will illustrate the general principles of the invention, examples of which are further illustrated in the accompanying drawings. In the drawings, the same reference numbers indicate identical or functionally similar elements.
    [0019] The damping mechanism and tensioner described here provide an asymmetric friction damper. The tensioner is typically part of a power system where the tensioner provides tension for an endless power transmission element such as a belt, chain, or other continuous loop that is in a system driven by at least one source that can also trigger an accessory. The power transmission element and the tensioner operate in concert with the tensioner providing tension to the endless power transmission element as needed and responding to its dynamic conditions.
    [0020] Referring now to FIG. 1, a motor is generally indicated by reference number 20 and uses an endless power transmission element 21 to drive a plurality of driven accessories as is well known in the art. The belt tensioner of this invention, generally referred to as 100, is used to provide a tensioning force on the endless power transmission element 21. The endless power transmission element 21 can be of any suitable type known in the art. technical. The tensioner 100 is configured to be attached to a mounting bracket or support structure 24 of the motor 20 by a plurality of fasteners 25. The fasteners may be nipples, screws, welds, or any other suitable fastener known in the art that will secure the tensioner in place during engine operation. The mounting bracket or support structure 24 can be of any configuration and include any number of openings for receiving the fasteners 25.
    [0021] The tensioning of an endless power transmission element with the tensioner described here is unusual in that it is the winding of an unwound spring that operates to rotate the tensioner arm to provide tension, which will be referred to here as the tensioning direction T. In the opposite direction, here referred to as the winding direction W, the tensioning arm will be considered to be winding in response to a prevailing force from the endless power transmission element which is tightening in the amplitude where the tensioner resides ; however, not typically for tensioners, the winding of the tension arm corresponds to a spring unwinding within the tensioners described.
    [0022] The tensioner winding can have some potentially undesirable effects on the intended function of the drive system. To mitigate these undesirable effects it may be useful to have a damper or damping mechanism, for example, a friction damper, incorporated in the tensioner, to resist the movement of the power transmission element, without adversely affecting the rotation of the tensioner, specifically its arm to tension the power transmission element. This type of friction damping is generally known as asymmetric damping, and in the tensioners described here the unwinding of the spring provides such damping. The spring's damping expands its turns outward, increasing its loop diameter, which is used here to provide asymmetric friction damping by making the spring act on another tensioner component where the spring forces in friction coupling with another surface.
    [0023] Referring to Figures 2-3, tensioner 100 provides asymmetric friction damping to the movement of an arm 102 by expanding the spring 106 as it unwinds in response to a belt load or other prevailing force of the transmission element of endless power which is tightening the span where the tensioner resides. The spring 106 transfers an outwardly directed force, a radial force, from its expanding turns to a bush 108 to force the bush 108 in friction coupling with an inner surface 146 of a support member 114 that houses at least part of the spring 106 and bushing 108 so that substantial friction damping is applied to the belt tensioner in the winding direction W. As explained above, the en-bearing direction occurs when the increase in tension causes the power transmission element endlessly lift the tension arm in a direction away from it. The tensioner resists rotation in the winding direction W with a frictional damping force, but not substantially resists movement of the tensioning arm towards the belt with the same frictional damping force.
    [0024] Unique to the construction of the tensioners described here is the use of the spring that expands radially where the radial expansion provides the force to force the parts in friction coupling to provide the damping and the radially expanded spring, that is, unrolled, apply a torsional force to apply torque to the tensioning arm to rotate the tensioning arm in the direction of tensioning T, that is, in the direction of the power transmission element.
    [0025] The application of radial force of the tensioner, instead of an axial force, allows some of the components to be made of less expensive materials since the components and joints do not need to be as robust as these would be to support the axial forces. The absence of axial forces allows some components to be made thinner, which can reduce the weight of the tensioner and the cost. Any radial forces that exist in the tensioner can be effortlessly contained within the support member of the belt tensioner.
    [0026] The tensioner 100 includes a tensioning arm 102 rotatable around a first geometric axis A in the direction of tensioning T and in the winding direction W opposite to the direction of tensioning as shown in FIG. 3, a spring 106, a bushing 108 , a support member 114, and a cap 118. The arm 102 includes a pulley 120 rotatable at its first end 130 for rotation about a second geometry axis B which is spaced from and parallel to the first geometry axis A. The pulley 120 may be coupled to arm 102 with a pulley screw 122, or another fastener, and may include a dust cover 124.
    [0027] The arm 102 includes, at its second end 132, an arm tree 104 that extends from the arm around the first geometry axis A. The arm tree 104 can include a sleeve 152 that has an open first end 154 and a partial bottom 117 that defines a second open end 156 that has a smaller opening compared to the first end 154. In one embodiment, sleeve 152 is generally cylindrical and defines a housing 150 that can receive spring 106. Within sleeve 152 one or more more slits 116 are present which extend through it, that is, the slits are opened from the outer surface of the arm tree 104 to its interior. When assembling, the first end 154 of the sleeve 152 can be closed by the cap 118 and the second end 156 can be closed by the support member 114. The cap 118 and the support member 114 can contain the other components of the tensioner, for example , spring 106, arm tree 104, and bushing 108, to protect them from contaminants.
    [0028] In one embodiment, the arm tree 104 includes two slits 116, more preferably, as shown in FIG.2, three slits 116, but is not limited to any specific number of slits. Slots 116 can be positioned equally spaced around the arm tree 104, which is advantageous for distributing the force exerted by the expansion spring 106 more evenly over the sleeve 108. In one embodiment, the slits ws / DOCS / LMM P193469 / RELATORIO / 17242141v1 116 can extend through sleeve 152. Slots 116 can be of any shape and / or configuration that allows the protrusions 110 of the bushing to extend into the cavity 143 defined by sleeve 152 for contact with spring 106 as per this expands.
    [0029] As best seen in FIG. 3, slots 116 can extend through sleeve 152 and into partial bottom 117. Slit portions 116 in partial bottom 117 only extend partially radially, into partial bottom 117, from so that the partial bottom 117 is circumferentially discontinuous on its outer periphery and circumferentially continuous on its inner periphery. The inner periphery being the nearest edge to the first geometric axis A. The circumferentially continuous inner periphery helps to stabilize or provide rigidity for the second open end 156 of sleeve 152 and provides the arm shaft 104 with fixed dimensions. In one embodiment, sleeve 152 is substantially cylindrical and has a fixed diameter.
    [0030] The partial bottom 117, as best seen in FIG.4, includes a topping feature 180 positioned inside the sleeve 152. The topping feature 180 receives the first end 107 of the spring 106. Consequently, when the arm tree 104 rotates with arm 102, topping feature 180 forces spring 106 to unroll and radially expand its diameter. In one embodiment, topping feature 180 is a partition or protuberance that provides a generally flat surface for a generally flat cut end of spring 106 to bump against it in direct contact. In another embodiment, topping feature 180 may be a sleeve, a support, a recess, or another receptacle within which the spring end 107 mounts to connect the spring to the arm tree 104 for movement with it.
    [0031] In one embodiment, the topping feature 180 can be a ramp feature, which depending on the ramp direction could either increase or decrease the expansion out of the spring. Someone skilled in the art will appreciate that the shape and / or contour of the topping feature 180 can be such that the tensioner could have asymmetrical or progressive damping.
    [0032] The second end 132 of the arm 102 can also include a flange 158 around the periphery where the arm tree 104 connects to the arm 102. The flange 158, when mounting the tensioner 100, can rest on the flange 115 of the member support 114. Extending from flange 158 there may be an outwardly flap 140 that can act as a stop to limit the rotational movement of arm 102 around the first geometry axis A when flap 140 contacts a stop, for example, stop 142 on the support member 114 and / or the flap 136 on the cap 118.
    [0033] The arm tree 104 is received into the cavity 153 of the support member 114. The support member 114 has a closed end 160 and an open end 162 that includes a pivot axis 144 that extends from the closed end 160 inwardly cavity 143 and around which the arm tree 104 rotates. The support member 114 can facilitate the assembly of the tensioner 100 in place with respect to an endless power transmission element. In one embodiment, the pivot axis 144 is generally centrally positioned within the cavity 143 and has an axially extending opening 145 or hole that can receive a tang, screw, pin, or other fastener 25 '(shown in FIG. 1 ) to attach the belt tensioner mounted together and / or mount the tensioner on a surface relative to an endless power transmission element. The support member 114 can also receive and / or house at least part of the bushing 108 and the spring 106.
    [0034] In one embodiment, the support member 114 may include an upper edge 115 or flange extending outwardly around the periphery of the open end 162 of the cavity 143 and a stop 142 projecting out of its outer wall near the end open 162 or as an extension of flange 115. In one embodiment, the support member 114 may also include a positioning pin 147 on the outer surface of the closed end 160 of the cavity 143 which is receivable within a receptacle which may be provided on the mounting bracket or support structure 24 of the motor 20.
    [0035] As shown in Figures 2-3, a bushing 108 is positioned or positioned between the arm tree 104 and the inner surface 146 of the support member 114 and is adjacent to the outer surface of the arm tree 104. The bushing 108 includes a sleeve 119 having a first open end 170 and a second open end 172 and one or more protrusions 110 extending from the inner surface of the sleeve 168 in the direction of the first geometric axis A. In one embodiment, the sleeve 119 is generally cylindrical. The number of protrusions 110 preferably coincides with the number of slots 116 in the arm tree 104 so that the bushing 108 is coincident with the arm tree 104 with its protrusions 110 received within the slits 116. Consequently, the protrusions 110 are formed to match the slots 116 of the arm tree 104. The protrusions 110 are also dimensioned so that they extend through the arm tree 104 into its internal cavity 143 and are accessible to or by the spring 106 as it expands when unrolling .
    [0036] The chuck 108 may also include a flange 113 that extends out of one end of the sleeve 119, for example, from the first open end 170. In the embodiment of Figures 2-3, the chuck 108 includes a slit 112 through it extending from the first open end 170 to the second open end 172. Slit 112 allows sleeve 108 to expand radially in response to the expansion of spring 106 as it unfolds. In an alternative embodiment, sleeve 108 can be generally elastic.
    [0037] The spring 106 is seated inside the cavity 143 of the support member 114 with its turns juxtaposed on the protrusions 110 of the bushing 108. Consequently, when the arm 102 rotates in response to belt loading or other prevailing force of the transmission element of endless power which is tightening within the amplitude where the tensioner resides, spring 106 will unwind, increasing the diameter of the loop, and radially expand its turns into the protrusions ws / DOCS / LMM P193469 / RELATORIO / 17242141v1 110 of the bushing 108 hereby directing the bushing 108 radially outwardly in relation to the arm tree 104, which remains stationary, and in friction coupling with the internal surface of the support member 114. When the belt loading or other prevailing force of the element power transmission unit dissipates, the torque accumulated in spring 106 as a result of its unwound state forces the tension arm 102 to rotate in the direction the tensioning T as the spring returns to its coiled state. Consequently, spring 106 is coupled to tensioner arm 102, so that the spring provides the torque to force tensioner arm T.
    [0038] Spring 106 is a torsional spring of any shape and / or configuration. In one embodiment, the torsional spring is a round wire spring. In another embodiment, the torsional spring can be a square or rectangular spring or a spiral spring square or rectangular. In another embodiment, the torsional spring is a flat wire spring. One skilled in the art will appreciate that these various torsional springs may require alternate spring end coupling points within the tensioner to provide secure attachments so that the spring rolls and unrolls properly to tension the arm.
    [0039] The spring 106 preferably has a first end 107 that couples the spring 106 to the tension arm 102, specifically to the arm tree 104, and a second end 109 that couples the spring 106 to the cap 118. The first end 107 of the spring 106, as discussed above, comes up against or is received within a first topping feature 180 of tension arm 102, best seen in FIG.4, to couple tension arm 102 to spring 106 so that rotation of tension arm 102 in the direction of winding W unroll the spring and thereby radially expand the diameter of the spring turns. Thereafter, the torque of the unwound expanded spring 106 can rotate the tension arm 102 in the direction of tension T to tension the power transmission element when the force lifting the tension arm in the winding direction W is reduced. Since the spring 106 uses its torque to rotate the arm 102, the spring 106 winds back to its original position thereby reducing and / or removing the radial force of the protrusions 110 of the bushing 108 so that a reduced or substantially none friction damping to resist rotation of the tension arm in the direction of the belt occurs. The damping of tensioner 100 is asymmetrical.
    [0040] The second end 109 of spring 106 is likewise stamped against or received within a second stub characteristic (item 182 in FIG.5) located inside cover 118. The second stub characteristic inside cover 118 can be the same as or different from the first topping characteristic 180. It is preferable that the second end 109 of the spring is stationary, that is, kept stationary by the cap 118, which is stationary in relation to the arm 102. Consequently, the second characteristic of Topping inside cover 118 must be configured to keep the second end 109 of spring 106 stationary.
    [0041] The cap 118 of Figures 1-3 includes a hole 134 generally centrally located to receive a fastener 25 'such as a spike, screw, rivet, or other fastener to secure the cap to the tensioner. Hole 134 can be recessed into the top surface 135 of the cap to receive the fastener head. The cap 118 may also include a flap 136 that extends out of it. The flap 136 may be L-shaped and comprise an arm 138 which generally extends horizontally outward from the outer periphery of the cap 118 and a flange 139 which extends generally vertically downward from the end of the arm 138 opposite the periphery of the cap. On the lower side 137 of the lid, a second topping feature for receiving an end of the spring 106 can be formed within or over it. A track 192 can be lowered into the lower side 137 of the cover to receive the spring 106 and can define at least part of the topping characteristic and extend away from it. The track 192 preferably coincides with the curvature of the spring 106. In one embodiment, the cap 118 may include more than one flap 136 and the flaps may attach the cap 118 to the arm 102 and / or the support member 114.
    [0042] In another embodiment, illustrated in Figures 5-6, the cap, generally designated as 118 ', has a grooved attachment on the pivot axis 144. The pivot axis 144 has a grooved end 186 opposite the joint of the pivot axis for the closed end 160 of the cavity 143 and a hole 145. The grooved end 186 provides a coincident connection between the support member 114 and the cap 118 '. To match the grooved end 186, the cap 118 'has a button 188 which comprises an internal configuration of alternating ridges 194 and recesses 196. The cover 118 'is held stationary by connecting the button 188 to the grooved end 186 of the pivot axis 144.
    [0043] Cap 118 'can include a hole 134' generally centrally located which is positioned through the center of button 188. Cap 118 'can also include a track 192' recessed within its bottom side 137 '. The track 192 'is formed to match the shape of the torsional spring 106, specifically the portion of the spring that includes the second end 109 of the spring 106 and at least part of the first loop extending therefrom. The track 192 'can also define part of the topping feature 182 against which the cut end of the second end 109 of the spring is in direct contact with it. Track 192 'may have a protrusion 190 that extends in this vicinity of the second end 109 of the spring 106 to help hold the second end 109 in place within the cap.
    [0044] The second topping characteristic 182 can be similar to the one described above.
    [0045] The modalities of this invention shown in the drawings and described above are exemplary of numerous modalities that can be made within the scope of the appended claims. It is contemplated that numerous other tensioner configurations can be created taking advantage of the proposal described. In summary, it is the applicant's intention that the scope of the resulting patent be limited only by the scope of the appended claims.
    权利要求:
    Claims (15)
    [0001]
    1.Tensioner (100) comprising: an arm (102) rotating around a first geometric axis, the arm comprising an arm tree (104) defining an interior cavity and having a slit (116) through its same portion, the arm tree having a fixed diameter; characterized in that the tensioner also comprises: -a bush (108) having a protuberance (110) dimensioned to extend through the slot and into the internal cavity of the arm tree, the bush (108) being positioned adjacent to the arm tree (104 ) with the protuberance (110) extending through the slit (116) of the arm tree (104) and inside its internal cavity; and -a spring inside the internal cavity of the arm shaft with a coil juxtaposed to the protuberance and operationally coupled to the arm, where the spring (106) forces the arm (102) to rotate around the first geometric axis in tensioning coupling with an endless power transmission element, in which the protrusion (110) of the bushing (108) is dimensioned in such a way that the spring (106) expands radially to contact and force the protrusion (110) of the bushing according to the arm ( 102) is rotated in a direction opposite to the tensioning coupling direction to force the bushing (108) radially outwardly away from the arm tree (104) to provide friction damping.
    [0002]
    Tensioner according to claim 1, characterized in that the bushing (108) includes a longitudinal slot (112) through which it allows its radial expansion.
    [0003]
    Tensioner according to claim 1, characterized in that the bushing (108) comprises a sleeve (119) which includes the protuberance (110) and comprises a flange (113) extending outwardly from one end of the sleeve.
    [0004]
    4. Tensioner according to claim 3, characterized in that the sleeve (119) of the bushing (108) is cylindrical.
    [0005]
    5. Tensioner according to claim 1, characterized in that the arm (102) includes a pulley (120) rotatable around a second geometry axis, the second geometry axis being spaced from and parallel to the first geometry axis.
    [0006]
    6. Tensioner according to claim 1, characterized in that it also comprises a support member (114) which houses the spring (106), the arm tree (104), and the bushing (108) with the bushing (108) adjacent to the support member (114) and the arm tree (104) between the spring (106) and the bushing (108).
    [0007]
    7. Tensioner according to claim 6, characterized in that the radial expansion of the spring (106) forces the bushing (108) in friction coupling with the support member (114) to provide friction damping.
    [0008]
    8. Tensioner according to claim 6, characterized in that the support member (114) is stationary and includes an axis (144) that defines the first geometric axis, in which the arm (103) is mounted rotatable on the axis.
    [0009]
    9. Tensioner according to claim 1, characterized in that it also comprises a cover (118) that closes the spring (106) inside the tensioner.
    [0010]
    10. Tensioner according to claim 1, characterized in that the spring (106) has a first end (130) coupled to the arm (102) and a second end (156) coupled to the cover (118).
    [0011]
    11. Tensioner according to claim 1, characterized in that the tensioner (100) provides asymmetric damping.
    [0012]
    12. Tensioner according to any one of claims 1 to 11, characterized in that it comprises a support member (114) which has an axis that defines a first geometric axis; where the arm shaft (104) is mounted on the axis for a rotational movement of the arm (102) around the first geometry axis, the arm tree (104) has a fixed diameter and defines a cavity that has the slot ( 116), which opens into the cavity; wherein the bushing (108) is between the support member (114) and the arm (102) with the protrusion extending through the slot (116) and into the cavity of the arm tree; wherein the spring (106) is received into the cavity of the arm tree (104) with a coil juxtaposed to the protrusion (110) of the bushing (108); comprising a pulley (120) pivotally mounted on the arm (102); and comprising a cover (118) enclosing the spring (106) within the tensioner (100).
    [0013]
    13. Tensioner according to claim 12, characterized in that the arm tree (104) comprises a generally cylindrical sleeve (152) having a first open end (154) and a partial bottom (117) which defines a second open end (156) which has a smaller opening compared to the first end.
    [0014]
    14. Tensioner according to claim 13, characterized in that the slot (116) extends through the sleeve (119) and into the partial bottom (117) so that the bushing (108) can slide over the arm tree (104).
    [0015]
    15. Tensioner according to claim 12, characterized in that the tensioner (100) provides asymmetric damping.
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    同族专利:
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    CN103154572B|2015-12-02|
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    法律状态:
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-05-14| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2020-04-07| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2020-09-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-01| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 03/08/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/874,797|US8617013B2|2010-09-02|2010-09-02|Tensioner with expanding spring for radial frictional asymmetric damping|
    US12/874,797|2010-09-02|
    PCT/US2011/046383|WO2012030463A1|2010-09-02|2011-08-03|Tensioner with expanding spring for radial frictional asymmetric damping|
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