• 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:
    An outer race (1) of a bearing, comprising a bracket (2) for fixing to a support at one end, a rolling zone (3) in contact with the rolling elements at the other end, and balusters (6 ) intermediate, tolerant of clearances of the rolling area (3) relative to the fixed flange (2), is provided with notches on a portion (7) of the rolling area (3), which come into contact with notches a fixed support established on the same circle, to stop the twisting movements of the ring (1) with balusters (6), which may appear in certain circumstances. The notches of the ring and / or the fixed support have a characteristic of flexibility large enough to ensure the distribution of forces on several notches simultaneously.
    公开号:FR3022312A1
    申请号:FR1455296
    申请日:2014-06-11
    公开日:2015-12-18
    发明作者:Francois Regis Marie Willieme；Daniel Plona
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    [0001] The subject of the present invention is a bearing arrangement with a torque limiting system. It incorporates a bearing comprising an inner ring, rolling elements and an outer ring with columns or squirrel cage, that is to say associated with a function of flexibility in the radial direction. This outer ring comprises, in addition to the rolling track, a fixing flange, and, in between, balusters that join them. The outer ring is mounted at the bearing area in a bearing support with a radial clearance, generally filled with oil to provide a damping function when the ring moves under the effect of rotary unbalance load. Depending on the radial force and the flexibility of the balusters, the radial clearance can be consumed in operation under exceptional forces fixed or rotating, but the abutment of the outer ring in the play of the cushioned bearing does not ceiling all efforts exerted on the balusters. When a large imbalance appears on the shaft as in the case of a fan blade rupture, the radial force at the frictional contact between the outer ring and the support is associated with a tangential component. This tangential force generates a creep of the rolling track in the tangential direction, that is to say a torsion of the outer ring and excessive deformations, which can lead to a rupture of the outer ring in its most sensitive zone, know the balusters. To limit the torque exerted on the cage, it has been envisaged and patented anti-rotation systems with stop notches including that of US Patent 4,451,110, which constitute torque limiting systems. The analysis of the efforts shows, however, that the durability of such a system is problematic because apart from contact plastification phenomena, the force is imposed on one notch at a time. The local plasticization rapidly increases the angle of rotation imposed on the cage and can lead to a matting of the notches. In the end, the system becomes ineffective and the balusters are no longer protected. According to the proposed invention, the creeping is stopped by the mutual contact of notches protruding on the outer ring and the support, and arranged on a common circle about a longitudinal axis of rolling of the outer ring, so as to create a stop which stops the creep at a torsion deformation considered acceptable of the outer ring. These notches are chosen with greater flexibility than known notches and such that the stop is distributed over several notches interfaces, so that the unit force on each of the notches is reduced and remains below the threshold of plasticization. This general design is compatible with many provisions of notches, both in terms of their number, their shape, their position, or their relative flexibility. Some embodiments of the invention will now be described in detail, with reference to the following figures: FIG. 1 represents in perspective an outer ring with columns without a torque limiting device; FIG. 2 represents in axial half-section the arrangement to which this ring belongs; FIG 3 shows in perspective an outer ring with torque limiting device; FIG. 4 represents in axial half-section the arrangement of an outer ring with torque limiting device; FIG. 5 represents in perspective the nesting of the notches; FIG 6 shows a detailed and enlarged form of realization of flexible notches according to the invention; FIG 7 illustrates an alternative embodiment, to limit the plasticization of the notches. FIG. 1 represents an outer ring 101 with rolling columns, of a known type, extending over a longitudinal bearing axis YY, but on which the invention can be implanted. It comprises a flange 2 circular and flat at one end, by which it can be bolted to a support, a rolling zone 103 at an opposite end, whose inner face 4 is contacted by the rolling elements and the outer face 5 delimits a play with a circular face facing, belonging to a support 7 (Figure 2) and 6 columns joining the flange 2 to the rolling zone 3 and arranged in a squirrel cage. FIG. 2 shows the arrangement of the bearing comprising the outer ring 101. The support 7 of the outer ring 101 comprises a flange 8 bolted to the flange 2, a circular bearing surface 109 for supporting the outer ring 101, surrounding the rolling zone. 103, and usually a ring 10 fixed to the circular range 109, comprising an inner face 11 facing the outer face 5 of the rolling zone 103, which it is separated by a game, usually filled with oil. A rotor 13 rotates in the support 7 about an axis XX substantially coaxial with the longitudinal axis YY of the ring 101 in at least one configuration such that the stop and the bearing further comprises, in addition to the outer ring 101, an inner ring 14 disposed on the rotor 13, and rolling elements 15, arranged between the outer ring 101 and the inner ring 14. Figures 3 and 4 show an outer ring, now 1, which is completed by a limiting device notched pair 17, the notches 17 being of approximately parallelepipedal shape, regularly distributed in outer axial projecting ring on a free end portion 16 of the outer face 5 of the outer ring 1. The free end portion 16 extends beyond the ring 10 in this embodiment of the outer ring 1, and the circular bearing, now 9, is extended by a ring 18 provided with notches 19, set in internal radial projection ee of the crown 18, on the same circle as the notches 17, and which interlock with them by mutual meshing to give a clutch mechanism. Figure 5 also illustrates this mechanism, with notches 17 'projecting radially for the outer ring 1, without this difference with Figures 3 and 4 is important. With this arrangement, the rotation of the outer ring 1 relative to the support 7, in case of crawling from a large unbalance, is stopped by the contacts between the notches 17 or 17 'and 19. However, it is observed that this design may be defeated by plastification and matting of the notches 17 or 17 'and 19, the contact being generally made by a single pair of notches, both because of small inevitable irregularities of angular position. A fundamental aspect of the invention is that the notches of at least one of the outer ring 1 and the ring 18, or the notches of these two parts, are relaxed relative to known designs. Indeed, it is observed that too rigid notches, typical of existing designs, produce the stop at an interface only, other notches first not coming into contact. The force exerted on the interface in contact can produce a plasticization, followed by a matting risk of leading to the rupture of the assembly. The softening can be achieved by appropriate sizing of the notches, for example as shown in Figure 6, where the notches of the ring 18 are now notches 26, radial, more elongated and thinner than the notches 19 shown in FIG. the preceding figures and which have the ability to flex more when they are in contact with the notches 17. sufficiently flexible notches allow to distribute the force of the outer ring 1 on several pairs of contact interfaces between notches, the notches 26 first contact deforming until others come into contact with neighboring notches 17 and until the torque experienced by the outer ring 1 is absorbed.
    [0002] Deformed notches 26 are, however, subjected to moderate effort and their deformations remain in the elastic range. However, too soft notches should be avoided since they would allow greater tangential displacement of the ring and thus reduce the effectiveness of anti-crawling. It is recommended, for common applications in aeronautics, a flexibility (movement of the ring compared to the force) between 1.10-9 m / N and 5.10-8 m / N to both limit the phenomenon of matting and protect the balusters excessive torsion of the ring. A flexibility of between 5.1e m / N and 1.10-8m / N is preferred. Interplay between notches that can come into contact (at the interfaces 27 in FIGS. 5 and 6, on one side of the notches if the crawling is provided in one direction, or on both sides if not) are advantageously less than 0.5 about 1 mm in the free state, and more preferably about 0.3 mm. The lateral faces or flanks of the notches may be radial or oblique, that is to say slopes with respect to a radial direction; they may be straight or curved (22 in Figure 6), and then join the competition with their bulging at about halfway up. The notches of the two parts may be radially projecting (the notches 17 'or 17 "of the outer ring 1 protruding outwards, the case of Figures 5, 6 and 7, and the notches 19, 19' or 26 of the crown 18 protruding inwardly), or the notches of one of the two parts (the notches 17 of the outer ring 1, the case of Figures 3 and 4) may be projecting axially, as has already been seen.
    权利要求:
    Claims (8)
    [0001]
    CLAIMS1) Rolling bearing arrangement, in which the bearing comprises an outer ring (1) extending on a longitudinal bearing axis (YY) and comprising a fastening flange (2) at one axial end, a rolling zone (3). ) in contact with rolling elements (15) at an opposite axial end and posts (6) joining the rolling area to the fastening flange, and the arrangement further comprises a bearing bearing circular bearing surface (9), the rolling zone with a clearance, the rolling zone (3) and the circular bearing (9) each comprising a plurality of notches (17, 17 ', 17 ", 19, 19', 26) located on a circle around the bearing axis and in mutual meshing, characterized in that the notches of the rolling area and / or the notches of the circular bearing are provided with a flexibility of between 1.10-9 m / N and 5.1em / N.
    [0002]
    2) rolling bearing arrangement according to claim 1, characterized in that the flexibility is between 5. m / N and 1.1e m / N.
    [0003]
    3) rolling bearing arrangement according to claim 1 or 2, characterized in that the notches are separated by gaps less than 0.5 mm.
    [0004]
    4) rolling bearing arrangement according to claim 1, 2 or 3, characterized in that the notches of the bearing zone are oriented in the direction of the rolling axis.
    [0005]
    5) rolling bearing arrangement according to any one of claims 1 to 4, characterized in that the notches have oblique flanks.
    [0006]
    6) rolling bearing arrangement according to any one of claims 1 to 4, characterized in that the notches have radial flanks.
    [0007]
    7) rolling bearing arrangement according to any one of claims 6, characterized in that the notches have curved flanks.
    [0008]
    8) rolling bearing arrangement according to any one of claims 1 to 6, characterized in that the notches have straight flanks.
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3022312B1|2017-03-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1553324A1|2004-01-12|2005-07-13|Snecma Moteurs|Bearing support with double stiffness|
    US20080152483A1|2006-12-22|2008-06-26|Rolls-Royce North American Technologies, Inc.|Bearing support|RU2623703C1|2016-08-09|2017-06-28|Публичное акционерное общество "Уфимское моторостроительное производственное объединение" ПАО "УМПО"|Elasticity-damper support with adjustable stiffness|
    RU2634512C1|2016-11-23|2017-10-31|Публичное Акционерное Общество "Уфимское Моторостроительное Производственное Объединение" |Resilent damping support with adjustable rigidity|
    FR3096744A1|2019-06-03|2020-12-04|Safran Aircraft Engines|SUPPORT AND GUIDE ASSEMBLY FOR AN AIRCRAFT TURBOMACHINE DRIVE SHAFT|
    DE202021104006U1|2021-07-27|2021-08-04|MTU Aero Engines AG|Bearing cage for a jet engine|
    法律状态:
    2015-06-12| PLFP| Fee payment|Year of fee payment: 2 |
    2015-12-18| PLSC| Search report ready|Effective date: 20151218 |
    2016-06-10| PLFP| Fee payment|Year of fee payment: 3 |
    2017-04-27| PLFP| Fee payment|Year of fee payment: 4 |
    2018-02-09| CD| Change of name or company name|Owner name: SAFRAN AIRCRAFT ENGINES, FR Effective date: 20170717 |
    2018-06-05| PLFP| Fee payment|Year of fee payment: 5 |
    2020-05-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-05-19| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1455296A|FR3022312B1|2014-06-11|2014-06-11|BEARING BEARING ARRANGEMENT WITH TORQUE LIMITING SYSTEM|FR1455296A| FR3022312B1|2014-06-11|2014-06-11|BEARING BEARING ARRANGEMENT WITH TORQUE LIMITING SYSTEM|
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