• 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 invention relates to a bearing support (26) intended to be secured to a fixed turbojet element for supporting a trunnion, comprising a cone (27) which flares from a central portion (28) for supporting the trunnion to a securing portion to the fixed element, a cylinder member (29) extending the securing portion to the fixed member while surrounding the cone (27), an upstream skirt (32) carried by the cone to delimit an upstream enclosure ( 33) for the central portion (28), at least one downstream revolution element (38, 42) carried by the cone (27) for delimiting a downstream enclosure (39, 43) for the central portion (28). According to the invention, this bearing support (26) is manufactured in one piece obtained by additive manufacturing.
    公开号:FR3079265A1
    申请号:FR1852557
    申请日:2018-03-23
    公开日:2019-09-27
    发明作者:Dimitri Daniel Gabriel Marquie；Adrien Jacques Philippe FABRE；Frederic Patard；Pierre Jean-Baptiste Metge
    申请人:Safran Aircraft Engines SAS；
    IPC主号:
    专利说明:

    TURBO-BEARING BEARING SUPPORT OBTAINED BY ADDITIVE MANUFACTURE DESCRIPTION
    TECHNICAL AREA
    The present invention relates to the formation of an aircraft engine bearing support by additive manufacturing.
    GENERAL CONTEXT OF THE INVENTION
    A double-flow turbojet engine has an inlet sleeve receiving the upstream air which is drawn in by a low pressure compressor, before being divided into a central primary flow and a secondary flow surrounding the primary flow. After passing the low pressure compressor, the secondary flow is propelled downstream to generate a thrust by being blown around the primary flow, upstream and downstream being defined relative to the direction of fluid flow in the turbojet .
    After passing the low pressure compressor, the primary flow passes through a high pressure compressor before reaching a combustion chamber. This primary flow is then expanded in a high pressure turbine linked in rotation with the high pressure compressor, then in a low pressure turbine linked in rotation with the low pressure compressor, before being expelled downstream.
    In the case of a double body turbojet, the high pressure compressor and the high pressure turbine are part of a high pressure body which surrounds a low pressure journal by rotating at a speed different from this one, this low pressure journal bearing the low pressure compressor and low pressure turbine.
    The low pressure journal and the high pressure body are carried upstream and downstream, by bearings housed in enclosures isolating them from the rest of the engine. Each bearing is lubricated by oil circulating in the enclosure which surrounds it, and which is delimited by fixed elements and by the rotary element which passes through it. Such a bearing is carried by a support while being surrounded by the enclosure.
    Figure 1 shows according to a design possibility that the invention proposes to improve, a section of a part of a turbojet engine 1 shows a low pressure journal 2, at the downstream end of which is secured a ferrule 3 which extends radially to be secured to discs 4 of a low pressure turbine 5 extending around a downstream portion of the journal 2.
    The pin 2 is surrounded in its downstream region by a bearing support 6 which carries a sleeve 7 intended to receive a roller bearing 8 to support the downstream part of the pin 2, and which is secured to a fixed element 9 of the motor located at its upstream, via a cone 10. This cone 10 widens from its downstream portion where it is secured to the support 6, towards its upstream portion where it is secured to the fixed element 9.
    The cone 10 is surrounded by a cylindrical element 11 secured to its upstream portion which it extends downstream, to delimit with this cone 10 and with the ferrule 3 a portion of an enclosure 12 containing the bearing.
    As can be seen in FIG. 2, a skirt 13 and two bodies of revolution 14 and 15 extend the central region of the cone 10 respectively upstream and downstream, this skirt and these bodies having external diameters of the order of internal diameter of the cone 10. An upstream support 16 comprising a crown by which it is fixed upstream of the skirt 13 carries a segmented radial seal 17 which delimits an enclosure 18 upstream of the bearing 8. The element of revolution 14 delimits together with the pin 2 two concentric enclosures 19 and 20 located downstream of the bearing 8.
    Given the manufacturing and mounting constraints associated with known techniques, these components, namely the support 6, the cone 10, the cylindrical element 11 the skirt 13, the element 14 and the upstream support 16 are fixed to each other. others according to different processes including in particular TIG welding.
    As can be seen in more detail in FIG. 3, the sleeve 7 comprises a main cylindrical portion engaged in the central region of the cone 10, and this main portion is extended by a portion in a squirrel cage through which this sleeve 7 is rigidly secured to an upstream end of the skirt 13.
    Additionally, an annular space extending between the sleeve 7 and the central portion of the cone 10 is hydraulically pressurized, to radially constrain the sleeve 7 to ensure that it clamps the outer ring of the bearing it receives when the engine is in service. Such an arrangement, also known as a compression damper or "squeezefilm", is described in patent document EP1650449.
    The segmented radial seal 17 has its upstream face which is covered by a flange of revolution 21 with a conical internal edge making it possible to introduce a pressure drop upstream of this seal 17.
    Additionally, a nozzle 22 visible in Figure 2 extends radially to introduce oil into the enclosure 18 to cool the seal 17 and lubricate the bearing 8. This oil is collected by a return path 23 visible in the figure 3 putting the lower portions of the enclosures 18, 19 and 20 into communication with one or more elements not shown to ensure its circulation and cooling.
    A design such as that of Figures 1 to 3 results from design and manufacturing solutions that the invention proposes to improve. In general, the design and manufacture of a bearing support are complex and costly operations involving a multiplicity of processes.
    The object of the invention is to provide a solution to remedy this drawback.
    STATEMENT OF THE INVENTION
    To this end, the subject of the invention is a bearing support, intended to be secured to a fixed element of a turbojet engine to support a journal, characterized in that it comprises:
    - a conical element which widens from a central support portion of the trunnion towards a securing portion to the fixed element;
    - A cylindrical member extending the securing portion to the fixed element while surrounding the conical element;
    - an upstream skirt carried by the conical element to delimit an upstream enclosure for the central portion;
    - At least one downstream element of revolution carried by the conical element to delimit a downstream enclosure for the central portion;
    and in that this bearing support is manufactured in one piece obtained by additive manufacturing.
    This design and manufacturing solution makes it possible to reduce the size and the mass of the bearing support by eliminating in particular the bolted connecting elements. It also makes it possible to reduce this mass due to the fact that the fatigue resistance of the material from laser fusion is greater than that of the material from foundry, which makes it possible to reduce the amount of material constituting the bearing support by notably reducing its thickness. at different points.
    The invention also relates to a bearing support thus defined, comprising an upstream support for a segmented radial seal extending the upstream skirt.
    The invention also relates to a bearing support thus defined, comprising a nozzle protruding from an internal face of the upstream skirt in the upstream enclosure to cool and lubricate the upstream enclosure.
    The invention also relates to a bearing support thus defined, comprising a sleeve intended to receive an external roller bearing ring surrounding the trunnion, this sleeve being surrounded by the central portion, and in which the sleeve is extended by a cage of squirrel by which it is rigidly secured to an upstream end of the upstream skirt.
    The invention also relates to a bearing support thus defined, in which the sleeve is spaced radially from the central portion which surrounds it to delimit an annular space intended to receive a hydraulic flow.
    The invention also relates to a bearing support thus defined, comprising a supply channel for the annular space surrounding the sleeve, this channel passing through the conical element.
    The invention also relates to a bearing support thus defined, comprising an oil return path connected to the upstream enclosure and / or to the downstream enclosure via a collector, this oil return path crossing the conical element.
    The invention also relates to a turbojet engine comprising a bearing support thus defined.
    BRIEF DESCRIPTION OF THE DRAWINGS
    - Figure 1 already described is a schematic sectional view of a section of a downstream part of a turbojet;
    - Figure 2 already described is a sectional view of a section portion of the downstream part of a turbojet;
    - Figure 3 already described is a half-sectional view of the bearing support;
    - Figure 4 is a half sectional view of the bearing support according to the invention;
    - Figure 5 is a partial perspective view of the interior of the upstream enclosure of the bearing support according to the invention which comprises a nozzle;
    - Figure 6 is a sectional view of the lower half of the bearing support according to the invention comprising an oil return path;
    - Figure 7 is a perspective representation of a material distribution for a bearing support according to the invention.
    DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS
    The idea underlying the invention is to form, by additive manufacturing, the entire bearing support including the cone with its central portion for supporting the journal as well as the cylindrical element extending and surrounding this cone, with the upstream skirt and the downstream elements of revolution which delimit the enclosures surrounding the central portion.
    In practice, the invention makes it possible to integrate three functions directly into the blank constituting the bearing support, namely a squirrel cage and a sleeve held by it, a segmented radial seal support, and a shock absorber. compression for the sleeve as well as other additional functions detailed below.
    The bearing support according to the invention which appears in Figure 4, where it is identified by 26 comprises a cone 27 which widens upstream from a central portion of revolution 28 towards a non-visible portion of attachment to an element fixed located at the edge of the largest diameter of this conical element 27.
    This support 26 has an overall shape of revolution around an axis AX corresponding to the longitudinal axis of the motor in which it is intended to be mounted, and it is oriented in such a way that the cone 27 opens or flares upstream AM of the engine and tightens downstream AV of the engine relative to the direction of advance of the engine in service.
    This cone is surrounded by a cylindrical member or cylinder 29 which extends downstream its edge of larger diameter, to delimit with this cone 27 an upstream portion of a peripheral enclosure 31. This bearing support 26 includes an upstream skirt 32 carried by the cone 27 to delimit an upstream enclosure 33 of the central portion 28, this skirt having a conical shape reducing from the cone 27 which carries it towards an upstream end 34 of this skirt.
    The upstream end 34 of the skirt is extended by an upstream support 36 intended to receive a segmented radial seal not shown in FIG. 4, ensuring at the level of the upstream of the enclosure 33 a seal between the bearing support and the rotary pin not shown. In addition, this upstream support 36 has, on its internal face, downstream of the portion for receiving the segmented radial seal, wipers 37 intended to complete the seal provided by the segmented radial seal, these wipers being in contact with an external face. of revolution of the trunnion not shown.
    This bearing support 26 comprises in its downstream portion a first element of revolution 38 carried by the cone 27, in the form of a wall which surrounds the central portion 28 while narrowing downstream, delimiting a first downstream enclosure 39 This first element of revolution carries on its internal face wipers coming into contact with an external face of the trunnion not shown in order to seal the downstream of the enclosure 39.
    A second element of revolution 42 is carried by the first element of revolution 38, constituting another wall of revolution which widens downstream to delimit a second downstream enclosure 43. This second element of revolution carries on its internal face wipers 44 coming into contact with an external face of the trunnion not shown to seal the downstream of the enclosure 39.
    This support 26 includes inside its central portion 28 a sleeve 46 intended to receive an external ring, not shown, of a roller bearing surrounding the journal, not shown, that this support 26.
    More particularly, the central portion 28 comprises an annular element 47 extending the cone 27, and the sleeve 46 extends inside the annular element 47 while being radially spaced therefrom by an annular space marked by 48 The sleeve 46 is not directly connected to the annular element 47 so as to benefit from a radial mobility relative to this annular element 47, this sleeve thus having a flexible mounting.
    Additionally, an intermediate ring, not shown, can be provided to be engaged in the annular space 48, so as to improve the sealing and the hydraulic circulation.
    As shown in Figure 4, the upstream end of this sleeve 46 is extended by a squirrel cage structure 49 through which the sleeve 46 is connected to the upstream end 34 of the skirt 32. The maintenance of the sleeve 46 is provided only by the squirrel cage 49. As visible in FIGS. 4 and 5, the squirrel cage structure 49 is formed mainly of a series of balusters 51 oriented parallel to the axis AX being regularly spaced from each other around this axis.
    This squirrel cage by means of which the sleeve is connected to the rest of the bearing support makes it possible to ensure flexible maintenance of the bearing with respect to the rest of the support, the openings separating its balusters give it a significantly lower rigidity than the others parts of the support which are full.
    As can be seen in FIG. 4, the bearing support 26 made in one piece also incorporates a channel 52 for supplying oil to the annular space 48, so as to form a "squeeze film" as detailed in the document EP1650449.
    This channel 52 comprises a downstream portion 53 located downstream of the cone 27, of radial orientation and which is directly connected to the annular space 48, and an upstream portion 54 oriented parallel to the axis AX, which passes through the cone 27 so as to be connected to a hydraulic supply member, not shown.
    As can be seen in FIG. 4, the upstream enclosure 33 is crossed by the balusters 51 without the latter separating it into several parts.
    In addition, the skirt 32 carries on its internal face a nozzle 56 oriented towards the axis of revolution AX, comprising a body 57 which extends radially towards the axis AX between two balusters 51 ending in a nozzle 58. This nozzle 58 is thus located radially in the central region of the enclosure 33, and radially between the segmented radial seal and the roller bearing. This nozzle 58 can thus diffuse in the enclosure 33 oil to cool the segmented radial seal and lubricate the roller bearing.
    The body 57 of the nozzle extends between two balusters to constitute a stop in rotation of the cage and to block the rotation of this cage in the event of breakage of balusters.
    As visible in FIG. 6, the bearing support 26 formed in one piece from additive manufacturing also includes an integrated oil return path 59 visible in FIG. 6. This path has a general form of tubular channel from orientation substantially parallel to the axis AX. This path 59 extends from a manifold located downstream of the cone 27, and into which the upstream enclosure 33 and the first downstream enclosure emerge 39, and it crosses the cone 27 to present an upstream end located substantially at the right of the portion fixing the bearing support 26. In practice, the integration of this oil return path into the bearing support produced by additive manufacturing makes it possible to dispense with drilling which had to be carried out by vibratory drilling in the State of the art.
    In general, the use of additive manufacturing makes it possible to significantly optimize the mass of the bearing support according to the invention, since the resistance to fatigue of the material produced by additive manufacturing is greater than the resistance to fatigue. conventional materials such as foundry, forging or machining.
    By way of example, FIG. 7 shows the product of a numerical simulation determining the distribution or the topology of the material to form the bearing support with respect to the stresses and stress cycles which it undergoes, without taking into account the additional functional constraints such as sealing and others.
    The model obtained identified by M, which describes a part of the bearing support 26 comprising its cone 27, fixing face, and its central portion 28, comprises solid parts P and empty parts, identified by V which correspond to scoops of ventilation not shown in the other figures.
    More generally, it emerges from this modeling M that the finished bearing support, designed for and derived from additive manufacturing comprises less material than the state of the art bearing support consisting of an assembly of forged parts and molded, in other words allowing a significant gain in mass.
    Regarding the wipers 37, 41, 44, they are formed in an abradable material different from the material forming the rest of the bearing support. These wipers can be formed with the rest of the bearing support by additive manufacturing by varying the composition of the powders deposited locally at the level of these wipers so as to locally constitute an abradable material therein.
    权利要求:
    Claims (8)
    [1" id="c-fr-0001]
    1. Bearing support (26), intended to be secured to a fixed element of a turbojet engine to support a journal, characterized in that it comprises:
    - a conical element (27) which widens from a central portion (28) for supporting the journal towards a portion for securing to the fixed element;
    - a cylindrical member (29) extending the securing portion to the fixed element while surrounding the conical element (27);
    - an upstream skirt (32) carried by the conical element to delimit an upstream enclosure (33) for the central portion (28);
    - At least one downstream element of revolution (38, 42) carried by the conical element (27) to delimit a downstream enclosure (39, 43) for the central portion (28);
    and in that this bearing support (26) is manufactured in one piece obtained by additive manufacturing.
    [2" id="c-fr-0002]
    2. bearing support (26) according to claim 1, comprising an upstream support (36) of segmented radial seal extending the upstream skirt (32).
    [3" id="c-fr-0003]
    3. bearing support (26) according to claim 1 or 2, comprising a nozzle (56) projecting from an internal face of the upstream skirt (32) in the upstream enclosure (33) to cool and lubricate the upstream enclosure (33).
    [4" id="c-fr-0004]
    4. bearing support (26) according to one of claims 1 to 3, comprising a sleeve (46) intended to receive an outer ring of roller bearing surrounding the journal, this sleeve (46) being surrounded by the central portion ( 28), and in which the sleeve (46) is extended by a squirrel cage (49) by which it is rigidly secured to an upstream end (34) of the upstream skirt (32).
    [5" id="c-fr-0005]
    5. bearing support (26) according to claim 4, wherein the sleeve (46) is spaced radially from the central portion (28) which surrounds it to delimit an annular space (48) intended to receive a hydraulic flow.
    [6" id="c-fr-0006]
    6. bearing support (26) according to claim 5, comprising a channel (52) for supplying the annular space (48) surrounding the sleeve (46), this channel (52) passing through the conical element (27) .
    [7" id="c-fr-0007]
    7. bearing support (26) according to one of the preceding claims, comprising an oil return path (59) connected to the upstream enclosure and / or to the downstream enclosure via a manifold ( 61), this oil return path (59) passing through the conical element (27).
    [8" id="c-fr-0008]
    8. Turbojet engine comprising a bearing support (26) as defined in one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    US20210062679A1|2021-03-04|
    WO2019180375A1|2019-09-26|
    CN111902611A|2020-11-06|
    FR3079265B1|2020-04-17|
    EP3752719A1|2020-12-23|
    引用文献:
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    US20140174858A1|2012-12-21|2014-06-26|General Electric Company|Combined sump service|
    US20150224743A1|2014-02-11|2015-08-13|General Electric Company|Additively manufactured article|
    US20150308502A1|2014-04-29|2015-10-29|MTU Aero Engines AG|Bearing cage and bearing means having this type of bearing cage as well as method for designing, repairing and/or replacing such a bearing cage|
    US20160290164A1|2015-03-30|2016-10-06|MTU Aero Engines AG|Method for additive manufacturing of a gas turbine casing part|
    EP3214273A1|2016-02-23|2017-09-06|General Electric Company|Sump housing for a gas turbine engine|
    FR3053728A1|2016-07-07|2018-01-12|Safran Aircraft Engines|BEARING SUPPORT IN TWO PIECES|
    FR2876758B1|2004-10-19|2008-04-18|Snecma Moteurs Sa|DEVICE FOR SUPPORTING AND GUIDING A ROTATING SHAFT|FR3097900B1|2019-06-26|2021-06-04|Safran Aircraft Engines|Turbomachine outlet bearing bracket|
    DE202021104006U1|2021-07-27|2021-08-04|MTU Aero Engines AG|Bearing cage for a jet engine|
    法律状态:
    2019-02-19| PLFP| Fee payment|Year of fee payment: 2 |
    2019-09-27| PLSC| Publication of the preliminary search report|Effective date: 20190927 |
    2020-02-20| PLFP| Fee payment|Year of fee payment: 3 |
    2021-02-18| PLFP| Fee payment|Year of fee payment: 4 |
    2022-02-21| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1852557A|FR3079265B1|2018-03-23|2018-03-23|TURBO-BEARING BEARING SUPPORT OBTAINED BY ADDITIVE MANUFACTURING|
    FR1852557|2018-03-23|FR1852557A| FR3079265B1|2018-03-23|2018-03-23|TURBO-BEARING BEARING SUPPORT OBTAINED BY ADDITIVE MANUFACTURING|
    EP19716971.7A| EP3752719A1|2018-03-23|2019-03-20|Turbojet bearing support produced by additive manufacturing|
    PCT/FR2019/050630| WO2019180375A1|2018-03-23|2019-03-20|Turbojet bearing support produced by additive manufacturing|
    US16/982,795| US20210062679A1|2018-03-23|2019-03-20|Turbojet bearing support produced by additive manufacturing|
    CN201980021404.XA| CN111902611A|2018-03-23|2019-03-20|Turbojet engine bearing support produced by additive manufacturing|
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