• 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:
    The present invention relates to a mechanical device (1), comprising: a bearing (10) including a fixed ring (12) and a pivoting ring (14) centered on a central axis (X10) and having an interface (16) defined between them ; and a lubrication system (20) of the interface (16). An acceleration field (G) tends to push the lubricant flow (L) from a first zone (Z1) to a second zone (Z2) of the bearing (10). According to the invention, the lubrication system (20) comprises a set of peripheral channels (30) passing through the fixed ring (12) and including, on the one hand, first channels (31) arranged in the first zone (Z1) and defining a first lubricant supply flow (Q31) (L) to the interface (16) and secondly channels (32) disposed in the second zone (Z2) and defining a second lubricant supply flow (Q32) (L) to the interface (16). The first flow (Q31) is greater than the second flow (Q32), so that the interface (16) receives a higher amount of lubricant (L) in the first zone (Z1) than the second zone (Z2). The invention also relates to a machine comprising at least one such mechanical device (1) and a method of implementing such a mechanical device (1).
    公开号:FR3015599A1
    申请号:FR1363476
    申请日:2013-12-23
    公开日:2015-06-26
    发明作者:Alexandre Aury；Pascal Deloeil；Thonon Thomas Doki
    申请人:SKF Aerospace France SAS；
    IPC主号:
    专利说明:

    [0001] TECHNICAL DEVICE COMPRISING A BEARING AND A LUBRICATING SYSTEM, MACHINE AND METHOD FOR CARRYING OUT THE INVENTION The present invention relates to a mechanical device comprising a bearing and a lubrication system. The invention also relates to a machine comprising at least one such mechanical device and a method for implementing such a mechanical device. The field of the invention is that of the lubrication of bearings, including bearings, ball joints or plain bearings. In a conventional manner, a bearing comprises a fixed ring and a ring movable in rotation around a central axis, for example a fixed inner ring and a movable outer ring. An interface is defined between the rings, in this case a raceway receiving, for example, balls or rollers. The raceway receives a flow of lubricant to allow satisfactory operation of the bearing.
    [0002] In a high acceleration application, for example a satellite bearing fitted to an epicyclic gear train, the bearing is subjected to a large acceleration field, ie a large centrifugal force. In practice, this centrifugal force tends to push the lubricant towards a particular area of the bearing. As a result, the bearing is not lubricated regularly, which can cause early failures in poorly lubricated areas. Also, the risk of loss of power ("drag loss" in English) increases in the lubricated area in excess. To overcome this problem of lubricant distribution, it is known to implement an oil jet directed to the interface between the bearing rings, in the area out of which the lubricant is repelled by centrifugation. Such a solution is not suitable for all applications, especially for reasons of space. In addition, when the bearing comprises several rows of rolling elements, the central rows are insufficiently lubricated in comparison with the lateral rows receiving the jet of oil. When the loads are low, it is known to use a hydrodynamic bearing or plain bearing rather than a bearing. Again, such a solution is not suitable for all applications. The object of the present invention is to provide an improved mechanical device comprising a bearing and a lubrication system. For this purpose, the subject of the invention is a mechanical device, comprising: a bearing including a fixed ring and a pivoting ring which are centered on a central axis and comprise an interface defined between them, for example a raceway or a surface sliding; and a lubrication system of the interface configured to provide a lubricant flow from at least one supply channel to the interface through the fixed ring; wherein an acceleration field tends to push the lubricant flow from a first zone to a second zone of the bearing. The mechanical device is characterized in that the lubrication system comprises a set of peripheral channels passing through the fixed ring and including, on the one hand, first channels which are arranged in the first zone and which define a first feed rate of lubricant to the interface and, secondly, second channels which are arranged in the second zone and which define a second lubricant supply flow to the interface, the first flow being greater than the second flow rate , so that the interface between the bearing rings receives a higher amount of lubricant in the first zone relative to the second zone. Thus, the invention makes it possible to optimize the distribution of the lubricant in the different zones of the bearing, thus improving the operation and the duration of view of the bearing. Lubrication is performed through the fixed ring, from below the interface between the bearing rings, that is to say under the raceway when the bearing is a bearing. As the lubricant tends to centrifugally migrate from the first zone to the second zone, the channels are distributed so as to bring more lubricant directly into the first zone of the bearing.
    [0003] According to other advantageous features of the invention, taken separately or in combination: the first zone comprising the first channels and the second zone comprising the second channels each define an angular sector with a vertex angle less than or equal to 180 degrees around of the central axis, preferably an angular sector with an apex angle less than or equal to 90 degrees for the first zone and an angular sector with an apex angle less than or equal to 150 degrees for the second zone. - The lubrication system comprises a number of first channels greater than the number of second channels. Each of the first channels has a section defining a first diameter, each of the second channels has a section defining a second diameter and the first diameter is greater than the second diameter. - Each of the first channels is spaced from an angle of between 2 and 30 degrees around the central axis relative to a neighboring channel among the first channels, clockwise or counterclockwise. Each of the second channels is spaced at an angle between 45 and 75 degrees around the central axis relative to an adjacent channel among the second channels, clockwise or counterclockwise. Each of the first channels is inclined in the clockwise or counterclockwise direction by an angle between 0 and 30 degrees with respect to a radial plane comprising the central axis and comprising the junction zone between this first channel and a shape distribution channel; annular centered on the central axis. - The lubrication system comprises at least one distribution channel which connects a set of first channels and / or second channels together and the overall flow rate of lubricant flowing in the distribution channel or channels is greater in the first zone relative to the second zone . - The lubrication system comprises a plurality of distribution channels arranged along the central axis, including at least one distribution channel which connects a set of first channels and / or second channels between them and which extends both in the first zone and in the second zone. The bearing comprises several rows arranged along the central axis and the lubrication system comprises, for each row, at least one distribution channel which connects a set of first channels and / or second channels between them. - The lubrication system comprises, for each row, a number of first channels greater than the number of second channels. - The supply channel is connected to the distribution channel or channels through junction channels located in the first zone. - The bearing is a bearing, while the interface is a raceway. - The bearing is a ball joint or a plain bearing and the interface is a sliding surface. - The fixed ring is the inner ring of the bearing and the pivoting ring is the outer ring of the bearing. The invention also relates to a machine, comprising at least one such mechanical device. For example, this machine can be a high power epicyclic reducer. The invention also relates to a method of implementing a mechanical device as mentioned above. According to the invention, the method comprises at least the following successive steps: a) forming orifices through the fixed ring of the bearing, these orifices being configured to receive the lubrication system and delimit the peripheral channels for feeding a flow lubricant to the interface between the bearing rings; b) assemble the lubrication system and the bearing; and c) supplying the lubrication system with lubricant, such that the interface between the bearing rings receives a greater amount of lubricant in the first zone relative to the second zone.
    [0004] The invention will be better understood on reading the description which will follow, given solely by way of nonlimiting example and with reference to the appended drawings in which: FIG. 1 is a perspective view of a mechanical device according to FIG. the invention, comprising a bearing type bearing and a lubrication system, partially shown for simplification purposes; Figure 2 is a view along the arrow II in Figure 1; Figure 3 is a section along the line in Figure 2; and FIG. 4 is another perspective view, at another angle and at another scale, showing a second embodiment of a mechanical device according to the invention, comprising a plurality of bearings arranged in parallel and a partially lubricated system. represented for the purpose of simplification. In Figures 1 to 3 is shown a mechanical device 1 according to the invention. The mechanical device 1 comprises a bearing 10 of the bearing type and a lubrication system 20 adapted to lubricate this bearing 10. The device 1, the bearing 10 and the lubrication system 20 are partially represented for purposes of simplification, as detailed below. after. In Figure 2 are shown a vertical plane Pv and a horizontal plane Ph for easy identification in space. The bearing 10 comprises a fixed inner ring 12, a pivoting outer ring 14 and an interface 16 located between the rings 12 and 14. The ring 12 is fixed relative to a central axis X10 of the bearing 10, while the ring 14 is movable. in rotation around the central axis X10 of the bearing 10. The interface 16 is formed by a race intended to receive at least one row of rolling elements, for example balls or rollers 18. The inner ring 12 is not shown in Figures 1 and 2, while the rollers 18 are not shown in Figure 1, for the sake of simplification. In Figure 3, a shaft 100 of tubular shape is mounted in the inner ring 12. In the example of Figures 1 to 3, the mechanical device 1 is provided to equip an epicyclic reduction gear. For this purpose, the outer ring 14 of the bearing 10 has a toothing 140. In other words, this outer ring 14 forms a toothed wheel.
    [0005] The lubrication system 20 comprises different types of fluid veins or channels 22, 24, 26, 28 and 30, materialized by a flow of lubricant L in FIGS. 1 to 3. The flow of lubricant flow L is represented by arrows , while the ducts defining these channels are not shown in Figures 1 to 3, for the sake of simplification. These pipes are preferably made of metal or plastic. The lubrication system 20 is configured to bring the flow of lubricant L from a feed channel 22 to the interface 16 formed by the raceway, through the inner race 12. The lubrication system 20 includes the power supply 22 connected to the splitter channels 24 by junction channels 26 and 28, as well as peripheral channels 30 which extend from the splitter channels 24 through the inner ring 12. The feed channel 22 extends parallel to the central axis X10 of the bearing 10. Each of the splitter channels 24 has an annular shape centered on the central axis X10. Radial junction channels 26 extend radially to axis X10 between channels 22 and 24. Axial junction channels 28 extend parallel to axis X10 and channel 22 between some of the channels 24. peripherals 30 extend radially from axis X10 from splitter channels 24, away from axis X10, to interface 16 between rings 12 and 14. In practice, an acceleration field G tends to push the flow of lubricant L from a first zone Z1 to a second zone Z2 of the bearing 10. In the example of Figures 1 to 3, the acceleration field G is directed upwards, in connection with the application The zone Z1 can be described as a lower zone, while the zone Z2 can be described as an upper zone. The zones Z1 and Z2 each define an angular sector with an apex angle less than or equal to 180 degrees around the central axis X10. In the context of the invention, the peripheral channels 30 include, on the one hand, first channels 31 which are arranged in the first zone Z1 and second channels 32 which are arranged in the second zone Z2. In the example of FIGS. 1 to 3, the first zone Z1 comprising the first channels 31 defines an angular sector of angle at the vertex a1 which is less than or equal to 90 degrees around the axis X10, whereas the second zone Z2 comprises the second channels 32 defines an angular sector of angle at the apex a2 less than or equal to 150 degrees around the axis X10. In other words, the first channels 31 are distributed in an angular sector with an ap angle less than or equal to 90 degrees around the axis X10, while the second channels 32 are distributed in an angular sector of angle at the apex a2 less than or equal to 150 degrees around the X10 axis. Overall, the zones Z1 and Z2 are diametrically opposite with respect to the central axis X10, with an offset of the zone Z1 in the clockwise direction to counter the effects of the rotation of the outer ring 14 counterclockwise and the mechanical loading. of the bearing 10. The first channels 31 jointly define a first lubricant supply flow Q31 to the interface 16. The second channels 32 jointly define a second lubricant supply flow Q32 to the interface 16. According to the invention, the first rate Q31 is greater than the second rate Q32. Thus, the interface 16 receives a higher quantity of lubricant L in the first zone Z1 with respect to the second zone Z2, so as to counteract the effects of the acceleration field.
    [0006] Preferably, the lubrication system 20 comprises a number of first channels 31 greater than the number of second channels 32. Each of the first channels 31 has a section defining a first diameter d31. Each of the second channels 32 has a section defining a second diameter d32. Preferably, the first diameter d31 is greater than the second diameter d32. In the case where the first channels 31 have diameters d31 different from each other and where the second channels 32 have diameters d32 different from each other, the smallest of the first diameters d31 is preferably greater than the largest of second diameters d32. In the example of Figures 1 to 3, the lubrication system 20 comprises four distribution channels 24, the supply channel 22 and the junction channels 26 are positioned only in the zone Z1, while the axial connecting channels 28 are positioned only in zone Z2. More specifically, the system 20 comprises two splitter channels 24 located in the zone Z1, a splitter channel 24 located in the zones Z1 and Z2 and a splitter channel located in the zone Z2. The channels 24 in the first zone Z1 have a section of width d241 radially to the central axis X10. The channel 24 in the first zone Z2 has a section of width d242 radially to the central axis X10. The width d241 is greater than the width d242. Preferably, the overall flow rate of lubricant L flowing in channels 24 of zone Z1 is greater than the overall flow rate of lubricant L flowing in channels 24 of zone Z2.
    [0007] The configuration of the lubrication system 20 makes it possible to maximize the pressure losses in zone Z2 with respect to zone Z1, that is to say that lubricant L travels longer to reach zone Z2 towards which the acceleration field G pushes him. Without this, the lubricant L would go directly to the zone Z2 without lubricating the zone Z1 of the bearing 10.
    [0008] In Figure 2, there are seven first channels 31 referenced 311, 312, 313, 314, 315, 316 and 317 and three second channels 32 referenced 321, 322 and 323 in the counterclockwise direction. Other channels 31 and 32 are located on the same radii defined around the axis X10 and are not visible in FIG. 2. In practice, the first channels 31 are generally closer to one another than the second channels 32 Preferably in the context of the invention, each of the first channels 31 is spaced at an angle of between 2 and 30 degrees around the axis X10 relative to an adjacent channel among the first channels 31, in the clockwise direction or counterclockwise, while each of the second channels 32 is spaced at an angle of between 45 and 75 degrees around the axis X10 relative to an adjacent channel among the second channels 32, clockwise or counterclockwise. Moreover, several channels 31 and / or several channels 32 may be situated in the same plane including the axis X10, as shown in FIG. 2. In the example of FIGS. 1 to 3, each of the first channels 31 extends radially to the X10 axis. For example, Figure 2 shows an angle β between channel 316 and a plane tangent to channel 24 is equal to 90 degrees. In a variant not shown, each of the first channels 31 may be inclined in the clockwise or counterclockwise direction by an angle between 0 and 30 degrees inclusive, with respect to a radial plane comprising the central axis X10 and comprising the junction zone between this channel 31 and the channel 24. In this case, the angle [3 is between 60 and 90 degrees inclusive. This configuration makes it possible to direct the flow of lubricant L leaving the first channels 31 preferably in the clockwise or counterclockwise direction. In the example of Figure 3, the channels 22 and 26 extend through the shaft 100, while the channels 24 and 30 extend through the inner ring 12 of the bearing 10. Other arrangements may be envisaged without departing from the scope of the invention. The method of implementation of the mechanical device 1 is detailed below.
    [0009] According to the invention, the method comprises at least the following successive steps a), b) and c). Step a) consists in forming orifices 120 through the fixed ring 12 of the bearing 10. These orifices 120 are configured to receive the lubrication system 20 and delimit the peripheral channels 30 for supplying the flow of lubricant L to the interface 16 between the rings 12 and 14 of the bearing 10. The step b) consists in assembling the lubrication system 20 and the bearing 10. The pipes of the system 20 are positioned in the interior space delimited by the inner ring 12 , in particular the ducts delimiting the channels 30 are introduced into the orifices 120. The step c) consists in supplying the lubrication system 20 with lubricant L, so that the interface 16 receives a quantity of lubricant L that is greater in the first zone Z1 with respect to the second zone Z2.
    [0010] The arrangement of the lubrication system 20 and the orifices 120 can be adapted according to the application provided for the mechanical device 1, in order to counter the centrifugal effect and optimize the distribution of the lubricant L at the interface 16. The behavior of bearing 10 in service and its service life are improved.
    [0011] Figure 4 shows an alternative mechanical device 1, comprising a multi-row bearing, lubricated by a single lubrication system 20. The acceleration field G is directed downwards. The constituent elements of the device 1 of Figure 4 are comparable to those of the first embodiment described above and, for the sake of simplification, bear the same reference numerals. Also for the purpose of simplification, the bearing is not shown in FIG. 4, while the lines of the system 20 delimiting the channels 22, 24, 26, 28 and 30 are shown. In the device 1 of FIG. 4, the bearing comprises several rows arranged along the central axis X10. In the case where the bearing is a bearing, the rows are rows of rolling elements arranged between the inner and outer rings. The lubrication system 20 comprises, for each row, one or two splitter channels 24 which connect a set of first channels 31 and second channels 32 between them. For each row, the number of first channels 31 is greater than the number of second channels 32. Moreover, the mechanical device 1 can be shaped differently from Figures 1 to 4 without departing from the scope of the invention. In a preferred embodiment of the mechanical device 1, the lubrication system 20 comprises a set of peripheral channels 30 passing through the fixed inner ring 12 of the bearing 10 and including, on the one hand, first channels 31 which are arranged in a first zone Z1 and which define a first lubricant supply flow Q31 to the interface 16 and, secondly, second channels 32 which are arranged in a second zone Z2 and which define a second flow Q32 of supply of lubricant L to the interface 16, the first flow Q31 being greater than the second flow Q32, so that the interface 16 between the rings 12 and 14 of the bearing 10 receives a higher amount of lubricant L in the first zone Z1 with respect to the second zone Z2 of the bearing 10. In variant not shown, the inner ring 12 is the rotating or pivoting ring while the outer ring 14 is the fixed ring of the bearing 10. According to FIG. another variant not shown, in operation the two rings 12, 14 of the bearing 10 rotate or pivot.
    [0012] According to another variant not shown, the lubrication system 20 comprises at least one distribution channel 24 which connects a set of first channels 31 and second channels 32 between them. The system 20 may comprise different distribution channels 24, each connecting either channels 31 between them, or channels 32 between them, or both channels 31 and 32. Preferably, the overall flow of lubricant L flowing in the or 24 is higher in the zone Z1 with respect to the zone Z2.
    [0013] According to another variant not shown, the bearing equipping the device 1 may be a ball joint or a plain bearing. In this case, the interface 16 is a sliding surface. In addition, the technical characteristics of the various embodiments and variants mentioned above may be, in whole or in part, combined with one another. Thus, the mechanical device 1 can be adapted in terms of cost and performance.
    权利要求:
    Claims (3)
    [0001]
    REVENDICATIONS1. Mechanical device (1), comprising: a bearing (10) including a fixed ring (12) and a pivoting ring (14) which are centered on a central axis (X10) and have an interface (16) defined between them, for example a raceway or a sliding surface; and a lubrication system (20) of the interface (16) configured to feed a lubricant flow (L) from at least one supply channel (22) to the interface (16) through the ring fixed (12); wherein an acceleration field (G) tends to push the lubricant flow (L) from a first zone (Z1) to a second zone (Z2) of the bearing (10); characterized in that the lubrication system (20) comprises a plurality of peripheral channels (30) passing through the fixed ring (12) and including, on the one hand, first channels (31) which are arranged in the first zone (Z1 ) and which define a first lubricant supply flow (Q31) (L) to the interface (16) and second channels (32) which are arranged in the second zone (Z2) and which define a second lubricant supply flow (Q32) (L) to the interface (16), the first flow rate (Q31) being greater than the second flow rate (Q32), so that the interface (16) ) between the rings (12, 14) of the bearing (10) receives a higher amount of lubricant (L) in the first zone (Z1) with respect to the second zone (Z2).
    [0002]
    2. Mechanical device (1) according to claim 1, characterized in that the first zone (Z1) comprising the first channels (31) and the second zone (Z2) comprising the second channels (32) each define an angular sector of apex angle (a1; a2) less than or equal to 180 degrees about the central axis (X10), preferably an angular sector of apex angle (a1) of less than or equal to 90 degrees for the first zone (Z1) and an angular sector of angle at the apex (a2) less than or equal to 150 degrees for the second zone (Z2).
    [0003]
    3. Mechanical device (1) according to one of the preceding claims, characterized in that the lubrication system (20) comprises a number of first channels (31) greater than the number of second channels (32) .354. 5. Mechanical device (1) according to one of the preceding claims, characterized in that each of the first channels (31) has a section defining a first diameter (d31). ), in that each of the second channels (32) has a section defining a second diameter (d32) and in that the first diameter (d31) is greater than the second diameter (d32). Mechanical device (1) according to one of the preceding claims, characterized in that each of the first channels (31) is spaced at an angle of between 2 and 30 degrees about the central axis (X10) with respect to a channel neighbor among the first channels (31), clockwise or counterclockwise. Mechanical device (1) according to one of the preceding claims, characterized in that each of the second channels (32) is spaced at an angle of between 45 and 75 degrees about the central axis (X10) with respect to a channel neighbor among the second channels (32), clockwise or counterclockwise. Mechanical device (1) according to one of the preceding claims, characterized in that each of the first channels (31) is inclined in the clockwise or counterclockwise direction by an angle of between 0 and 30 degrees with respect to a radial plane comprising central axis (X10) and comprising the junction zone between this first channel (31) and an annular distribution channel (24) centered on the central axis (X10). Mechanical device (1) according to one of the preceding claims, characterized in that the lubrication system (20) comprises at least one distribution channel (24) which connects a set of first channels (31) and / or second channels (32). ) between them and in that the overall flow of lubricant (L) flowing in the distribution channel or channels (24) is greater in the first zone (Z1) relative to the second zone (Z2). Mechanical device (1) according to one of the preceding claims, characterized in that the lubrication system (20) comprises a plurality of distribution channels (24) arranged along the central axis (X10), of which at least one distributing channel ( 24) which connects a set of first channels (31) and / or second channels (32) to each other and which extends into both the first zone (Z1) and the second zone (Z2) .10. Mechanical device (1) according to one of the preceding claims, characterized in that the bearing (10) comprises a plurality of rows arranged along the central axis (X10) and in that the lubrication system (20) comprises, for each row, at least one splitter channel (24) which connects a set of first channels (31) and / or second channels (32) to each other. 11. Mechanical device (1) according to claim 10, characterized in that the lubrication system (20) comprises, for each row, a number of first channels (31) greater than the number of second channels (32). Mechanical device (1) according to one of claims 7 to 11, characterized in that the supply channel (22) is connected to the distribution channel (s) (24) via connecting channels (26) located in the first zone (Z1). 13. Mechanical device (1) according to one of claims 1 to 12, characterized in that the bearing (10) is a bearing, while the interface (16) is a raceway. 14. Mechanical device (1) according to one of claims 1 to 12, characterized in that the bearing (10) is a ball or a sliding bearing, while the interface (16) is a sliding surface. Mechanical device (1) according to one of claims 1 to 14, characterized in that the fixed ring (12) is the inner ring of the bearing (10) and that the pivoting ring (14) is the outer ring. bearing (10). 16. Machine, characterized in that it comprises at least one mechanical device (1) according to one of claims 1 to 15. 17. Method of implementation of a mechanical device (1) according to one of claims 1 to 15, characterized in that the method comprises at least the following successive steps: a) forming orifices (120) through the fixed ring (12) of the bearing (10), these orifices (120) being configured to receive the lubricating system (20) and defining the peripheral channels (30) for supplying a flow of lubricant (L) to the interface (16) between the rings (12, 14) of the bearing (10); b) assembling the lubrication system (20) and the bearing (10); etc.) supplying the lubrication system (20) with lubricant (L), so that the interface (16) between the bearing rings (12, 14) of the bearing (10) receives a higher amount of lubricant (L) in the first zone (Z1) with respect to the second zone (Z2).
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    FR3084429B1|2018-07-26|2020-11-13|Safran Trans Systems|REDUCER OR DIFFERENTIAL TYPE DEVICE FOR AN AIRCRAFT TURBOMACHINE|
    FR3090054B1|2018-12-17|2021-01-22|Skf Aerospace France|Roller bearing with lubrication channel|
    法律状态:
    2015-12-29| PLFP| Fee payment|Year of fee payment: 3 |
    2016-12-29| PLFP| Fee payment|Year of fee payment: 4 |
    2017-12-26| PLFP| Fee payment|Year of fee payment: 5 |
    2019-12-26| PLFP| Fee payment|Year of fee payment: 7 |
    2020-12-29| PLFP| Fee payment|Year of fee payment: 8 |
    2021-12-27| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1363476A|FR3015599B1|2013-12-23|2013-12-23|MECHANICAL DEVICE COMPRISING A BEARING AND A LUBRICATION SYSTEM, MACHINE AND METHOD FOR IMPLEMENTING SAID METHOD|FR1363476A| FR3015599B1|2013-12-23|2013-12-23|MECHANICAL DEVICE COMPRISING A BEARING AND A LUBRICATION SYSTEM, MACHINE AND METHOD FOR IMPLEMENTING SAID METHOD|
    US14/572,873| US9382945B2|2013-12-23|2014-12-17|Mechanical device comprising a bearing and a lubrication system, implementing machine and method|
    EP14199843.5A| EP2886894B1|2013-12-23|2014-12-22|Mechanical device comprising a bearing and a lubrication system, implementing machine and method|
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