• 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:
    Propeller without fairing for turbomachinery A propeller without fairing of variable pitch vanes, whose feet (38) are each engaged, from the outside, in a radial housing of a motor annular element and guided in rotation around its axis by two rolling bearings (76, 94), one of which is held by an annular segment (54) with a cylindrical skirt (56) mounted on a throat (50) of the cylindrical body (40) and by a locking nut (64 ) screwed onto the cylindrical skirt (56). Said bearing (94) is covered externally by a ring (100) which has external engagement teeth (108) that operate in conjunction with the internal engagement teeth (112) of the housing's bore to radially retain the ring (100) in the housing . Locking means engaged between the teeth (112) of the housing and those of the ring (100) prevent the rotation of the ring (100) and its axial removal from the housing.
    公开号:BR112012025186B1
    申请号:R112012025186-4
    申请日:2011-04-01
    公开日:2020-10-13
    发明作者:Michel Andre Bouru；Adrien Jacques Philippe Fabre；Laurent Jablonski；Jean-Noël MAHIEU
    申请人:Snecma；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a variable pitch vane propeller for a propeller-type turbomachine without fairing (in English “open rotor” or “unducted fan”).
    [0002] A turbocharger of this type comprises two external coaxial and counter-rotating propellers, respectively upstream and downstream, which are driven in rotation by a turbocharger turbine, and which extend substantially radially towards the outside of the turbocharger nacelle. .
    [0003] Each propeller comprises a rotor element that has substantially radial cylindrical housings distributed around the longitudinal axis of the turbomachinery and on which support plates for the propeller blades are mounted. Each vane comprises, for example, a dovetail section foot that is axially engaged and radially retained in a groove complementary to the plate.
    [0004] Each plate comprises a substantially cylindrical body screwed into a cylindrical crown which is centered and guided in rotation in a housing of the rotor element by means of roller or ball bearing bearings.
    [0005] The plates and crowns can rotate in the housings of the rotor element and are driven in rotation around the axes of the vanes by appropriate means, in order to regulate the angular pitch of the vanes. This type of assembly is not, however, satisfactory, due to the fact that the radial retention of the vanes in the radial housings is ensured by screwing threads of the plates on the crowns, whose threads run the risk of deteriorating quickly, thus limiting the life span of the propeller.
    [0006] Thus, the Applicant has already proposed in its Order FR09 / 01343 to form protruding teeth on the outer surface of the reed support plate, the plate being engaged from the outside in a radial housing, and the plate teeth operating in conjunction with the complementary teeth of the inner surface of a crown engaged from inside the housing.
    [0007] However, in this type of configuration, the disassembly of the vanes imposes the previous access to the radial locking crown of the stage mounted from inside the housing, which requires disassembly of elements of the rotor hub. Therefore, it is not possible to perform a simple and quick disassembly of the vanes on (one) scale, for example, when the plane is parked at an airport.
    [0008] In certain cases and, for example, when the reed is woven from a material composed of carbon fibers, it is impossible to make a reed foot in a dovetail, and the foot is generally cylindrical in shape. Thus, in Applicant's FR 10/50234 application, the cylindrical vane foot comprises an annular flange at its internal end. An inner vane ring is mounted tightly around the foot and comprises at its lower end an annular flange that operates in conjunction with the annular flange of the foot, to ensure radial retention of the foot. The inner ring is connected by means of rolling balls to two axially spaced outer rings fixed by screwing into the radial housing.
    [0009] In this embodiment, the rolling balls are inserted one by one from the inside of the housing in the space between the inner and outer rings, which requires a long placement time for each vane. In addition, the handling of each bearing ball can lead to the introduction of polluting elements between the inner and outer rings, such as abrasive dust that can damage the balls and raceways.
    [0010] The invention is notably aimed at bringing a simple, effective and economical solution to these problems.
    [0011] For this purpose, it proposes a propeller without fairing for a turbomachinery, which comprises propeller vanes mounted for rotation around their axes in radial housings of a rotor ring element, each van having a cylindrical body foot engaged since the exterior in a radial housing and guided in rotation around its axis within this housing, by means of two rolling bearings, characterized by the fact that a first bearing is maintained by an annular edge of the radially internal end of the housing and by the second bearing is not maintained by a ring segment of a cylindrical skirt mounted on a throat of the cylindrical body and by a locking nut screwed on the segment's cylindrical skirt and which forms a support spacer on the first bearing, the second bearing being covered externally by a ring that surrounds the cylindrical body of the reed foot and has external coupling teeth that operate in conjunction with coupling teeth internal elements of the housing, to axially retain the ring in the housing, and in which the locking means are engaged between the housing coupling teeth between the ring coupling teeth to prevent the rotation of the ring and its axial removal from the housing.
    [0012] Unlike the prior art, the first roller bearing is mounted in the assembled state from the outside in the housing on a flange of the radially internal end of the housing. The second bearing is also mounted in the state mounted around the foot and brought by the annular segment mounted on the annular throat and maintained on it by means of the screw screwed on the cylindrical skirt of the annular segment.
    [0013] The assembly formed by the reed, the second bearing, the ring segment and the nut, is engaged axially from the outside in the radial housing. The radial locking of the reed in the housing is ensured by a ring not mounted from the inside of the housing as in the prior art, but from the outside of this housing. The ring comprises a coupling denture engaged and blocked in radial support over a complementary dentation of the housing, to resist the centrifugal efforts applied to the operating vane.
    [0014] In order to mount the ring from the outside in the housing, it is understood that the ring must be mounted around the foot before mounting the second bearing around the reed foot. The ring is then assembled and then placed in a waiting position around the foot until it is fixed by coupling in the radial housing.
    [0015] The radial retention of the vanes is therefore not ensured by a fillet, but by a coupling system and the assembly and disassembly operations of the vanes can advantageously be carried out from the outside under the wing of a plane without intervention in the rotor hub, since the ring is assembled from the outside.
    [0016] According to a characteristic of the invention, an annular cover that surrounds the reed foot is screwed on the outer end of the housing to prevent axial removal of the locking means. Fixing the cover by screwing does not pose any difficulty, since it is not used if not to ensure the radial retention of the locking means and not the radial retention of the vanes, and is therefore not required for transmission of transmitted centrifugal forces the reeds in operation.
    [0017] According to yet another feature of the invention, the annular segment is in two parts mounted end to end at the throat of the reed body.
    [0018] The cylindrical skirt of the annular segment can comprise at least one tooth on an axial projection engaged in a reinforcement of the cylindrical body and opening into the annular throat in order to block the segment on the cylindrical body in rotation.
    [0019] A locking washer is advantageously inserted between the nut and the ring segment, and operates together by way of connection with the nut and the segment to rotate the nut on the reed foot.
    [0020] In a particular embodiment of the invention the ring comprises three coupling teeth distributed evenly around its axis and each having an angular extension of approximately 60 °.
    [0021] The rotating locking means of the ring in the housing may comprise keys in the form of cylinder sectors engaged by means of axial translation from the outside between the ring coupling teeth and the housing coupling teeth. Each key is inserted, for example, by translation in a direction parallel to the housing axis between two consecutive teeth of the ring and between two consecutive teeth of the housing. These keys operate together by strut (stop) in a circumferential direction with the circumferential ends of the ring teeth and the housing teeth to immobilize the ring in rotation in the housing.
    [0022] Another locking washer is advantageously interspersed between the cover and the ring, and operates together by connecting shapes with the cover and the ring to make the cover on the ring rotating.
    [0023] According to another characteristic of the invention, the reed foot is hollow and comprises metallic reinforcements fixed by gluing on its internal and external faces. This type of reinforcement can, for example, be used in the case of a shovel (reed) made of material composed of carbon fibers. In this case, the annular throat accommodating the cylindrical skirt of the annular segment is formed on the external surface of the external reinforcement.
    [0024] Advantageously, the reed foot wall is substantially constant in thickness and comprises undulations that operate in conjunction with complementary undulations of the reinforcements. These undulations ensure, by shape cooperation, a better fixation of reinforcements on the reed feet.
    [0025] The invention also relates to a turbomachinery such as a turboprop or aircraft turboprop, which comprises at least one propeller as described here above.
    [0026] The invention will be better understood, and other details, advantages and characteristics of the invention will appear from reading the description below, made as a non-limiting example, with reference to the attached drawings, in which: Figure 1 is a schematic view, in axial section, of a propeller turbomachine without fairing; Figure 2 is a schematic view, in section according to a plane that passes through the axis of a radial housing of a rotor element, in which a propeller blade according to the invention is mounted and fixed; Figure 3 is a schematic view, in perspective, of the rotor head of Figure 2; Figure 4 is a schematic view, in exploded perspective, of different parts of Figure 2, without the rotor element; Figure 5 is another schematic view in perspective with explosion and partial removal of the different parts of Figure 2, without the rotor element; Figures 6 to 11 are schematic views in perspective, and with the partial removal of the rotor element of the reed foot that supports a roller bearing, the locking ring and the upper cover of figure 2, and illustrate the assembly steps of these elements .
    [0027] Reference is made first to Figure 1, which represents a 10-propeller turbomachine without fairing, known under the English acronym "open engine" or "free fan", which has, from upstream to downstream, in the direction of gas flow inside the turbomachinery, a compressor 12, a ring combustion chamber 14, a high pressure turbine 16, two low pressure turbines 18, 20 that are counter-rotating, that is, they rotate in two opposite directions around the axis of the turbomachinery.
    [0028] Each of these downstream turbines 18, 20 drives in rotation an external propeller 22, 24 that extends radially outside the nacelle 26 of the turbomachine, this nacelle 26 being substantially cylindrical and extending along the A axis around the compressor 12, combustion chamber 14 and turbines 16, 18 and 20.
    [0029] The air flow 28 that penetrates the turbomachine is compressed, then it is mixed with the fuel and burned in the combustion chamber 14, the combustion gases then passing through the turbines to rotate the propellers 22, 24 that provide the largest part of the thrust generated by the turbomachinery. The flue gases leaving the turbines are expelled through a pipe 32 (arrows 30) to increase the thrust.
    [0030] Propellers 22, 24 are placed coaxially one behind the other, and have a plurality of vanes distributed evenly around the A axis of the turbomachine. These vanes extend radially and have a variable pitch, that is, they can rotate around their axes in order to optimize their angular positions according to the turbomachinery's operating conditions.
    [0031] According to the invention, and as shown in figures 2 to 5, each propeller comprises a rotor element formed by a polygonal ring 34 which extends around the A axis of the turbomachine and which has a plurality of radial housings 36 substantially cylindrical, in which the feet of the propeller blades are engaged. The foot 38 of each reed is hollow and comprises a substantially cylindrical body 40 engaged in a radial housing 36 of the polygonal ring 34. An annular flange 42 is formed at the radially internal end of the foot 38. The cylindrical body 40 comprises two metallic reinforcements 44, 46. The first reinforcement 44 has an annular flange 48 at its lower end and is engaged by radial translation inside the foot so that its flange comes in contact with the annular flange 42 of the foot. The second metallic reinforcement 46 is mounted on the outside of the foot and around it and its lower end is positioned axially against the annular flange 42 of the foot 38. The metallic reinforcements 44, 46 are fixed on the foot, for example, by gluing .
    [0032] The external metallic reinforcement 46 comprises an external annular throat 50 and two diametrically opposed reinforcements 52. These reinforcements 52 are formed on the lower rim of the annular throat 80 and flow into it.
    [0033] An annular segment 54 is mounted on the annular throat 50 and comprises a cylindrical skirt 56 connected at its radially outer end to a radial annular rim 58 which has four notches 60 evenly distributed over its periphery. The inner end of the cylindrical skirt comprises two teeth 62 protruding axially into the housing and diametrically opposed to each other. These teeth 62 are engaged with the reinforcements 62 of the external metallic reinforcement 48. The outer surface of the cylindrical skirt 56 comprises a screw thread of a locking nut 64 of the ring segment 54 in the annular throat 50.
    [0034] The ring segment 54 is made in two parts 66, 68 to allow its assembly in the ring neck 50 of the reed body.
    [0035] Preferably, the ring segment 54 is made of a single piece, then the filleting is performed on the outer surface of the cylindrical skirt 56 of the ring segment 54. The ring segment 54 is then cut into two 180 ° parts. angular extension. The fileting on the monobloc annular segment 56 makes it possible to guarantee the alignment of the filaments of each of the two parts 66, 68 of segment 54 when it is mounted on the annular throat 50 of the reed body.
    [0036] A first washer 70 is axially inserted between the nut 64 and the ring edge 58 of the ring segment 54 and comprises on its outer periphery first legs 72 folded outwards and engaged in the notches 80 of the ring edge 58 of the ring segment 54 of in order to immobilize washer 70 in relation to annular segment 54.
    [0037] A first washer 70 also comprises on its outer periphery second legs 74 folded inwardly engaged between the teeth of the outer periphery of the nut 64, in order to immobilize the washer in rotation in relation to the nut 64 screwed on the segment 54 .
    [0038] A first ball bearing housing 76 is mounted inside the radial housing and is carried by an annular flange 78 of the radially inner end of housing 36. A ring 80 of bearing 76 is supported on a pre-tightening washer 82 interspersed between the annular edge 78 of the housing and the bearing 76. This pre-tightening washer 82 limits shocks on the annular edge of the housing and has a thickness on the order of 0.5 to 0.8 mm. The other ring 84 of the bearing 76 is in contact with the radially inner end of the nut 64 on the one hand, and with the external metallic reinforcement 46 of the reed foot on the other hand. The inner periphery of the annular rim 78 of the housing comprises an annular throat 86 on which an annealing seal ring (not shown) is mounted in contact with the cylindrical body of the reed foot. An annular throat 88 is also formed on the inner face of the annular edge 78 of the housing and has another annular tightness retaining ring (not shown) which operates in conjunction with an inner annular cover 90 screwed from the inside onto the outer periphery edge 78. This inner cover 90 has a central opening 92 for the passage of angular distribution means (angular step) of the reed.
    [0039] A second bearing 94 is supported by means of its inner ring 95 on the outer surface of the annular rim 58 of the ring segment 54. The outer ring 96 of this second bearing is supported on an inner surface of a radial annular rim 98 of a ring 100 covering the second bearing 94. The ring edge 98 of ring 100 has an annular throat 102 on its inner periphery in which is located an annular tightness retaining ring (not shown) which operates in conjunction with the upper end of the body the reed foot.
    [0040] Ring 100 has an upper part 104 which has on its internal periphery a plurality of notches 106 evenly distributed around the axis of ring 100. Coupling teeth 108 protruding radially outwards are formed on the cylindrical surface outer ring. These teeth 108 are three in number in the embodiment shown in the figures and each have an angular extension of approximately 60 °.
    [0041] The radial housing also comprises three coupling teeth 112 distributed evenly around the D axis of the radial housing. These teeth 110 are formed on a cylindrical internal surface of the housing and each have an angular extension of approximately 60 °.
    [0042] At the stop of the turbomachine the ring 100 is in axial support on an annular shoulder 110 of the housing and there is an axial clearance between the coupling teeth 108 of the ring 100 and the coupling teeth 112 in the radial housing. This axial clearance is necessary for mounting the ring 100 in the radial housing. In operation, the centrifugal force pushes the coupling teeth 108 of the ring in axial support over the coupling teeth 112 of the radial housing.
    [0043] Locking keys 114 such as cylinder sectors are engaged radially between the coupling teeth 108 of the ring 100 and the coupling teeth 112 of the housing and come axially against the shoulder 110 of the housing. In the embodiment shown in the figures, the braces 114 extend at an angle in approximately 60 ° and their axial dimension is sufficient for the braces to intercalate circumferentially between the coupling teeth 108 of the ring 100 and the coupling teeth 112 of the housing .
    [0044] An annular cover 116 is screwed on the radially outer end of the housing and comprises notches 118 evenly distributed over its internal periphery.
    [0045] A second washer 120 is inserted between the ring 100 and the cover 116, and comprises first legs 122 folded outwardly in the notches 118 of the cover 116, and second legs 124 folded inwardly in the notches 106 of the ring 100. In this way, the cover 116 is immobilized in rotation on the ring 100 itself immobilized in rotation in the housing by the locking keys 114.
    [0046] Ring throats 126 are provided on the outer periphery of the housing on the top of the ring and receive tightness ring retaining rings (not shown) that operate with the inner surface of the outer ring cover 116.
    [0047] The assembly of a reed in a radial housing of the polygonal ring 100 is carried out as follows (figures 6 to 11).
    [0048] Firstly the outer annular cover 116, the second washer 120 and the locking ring 100 are engaged by translation around the foot 38 from its lower end and are placed on hold for later use. The second bearing 94 is assembled in one piece around the reed foot. The two portions 66, 68 of the annular segment are arranged end-to-end in the annular throat of the outer metallic reinforcement 46, so that the teeth 62 of the cylindrical skirt 56 penetrate the reinforcements 52 of the throat 50 to immobilize the annular segment 54 in rotation in the throat. ring (figure 6). The first washer 70 is mounted around the foot and the nut 64 is screwed onto the cylindrical skirt 56 in the annular segment. The first legs and the second legs 72, 74 of the first washer 70 are folded to immobilize the nut 64 on the ring segment 54 in rotation (figure 7).
    [0049] In addition, the pre-tightening washer 82 was mounted in the radial housing and the first bearing 76 was mounted in the state mounted on the ring edge 78.
    [0050] The reed foot is then radially engaged in the radial housing (figure 8), the nut 64 forming a supporting spacer on the first bearing 78. The locking ring 100 is positioned at an angle so that its teeth coupling 108 engages radially between the coupling teeth 112 of the housing (figure 9). The locking ring 100 is then axially inserted until it comes axially over the ring shoulder 110 of the housing, then it is rotated by an angle of 60 ° corresponding to the angular extension of the coupling teeth, in order to ensure axial locking of ring 100 in the radial housing (figure 10). The locking keys 114, in number three, are engaged axially from the outside between the coupling teeth 108 of the ring 100 and the coupling teeth 112 of the housing, in order to immobilize the ring 100 in rotation in the radial housing (figures 4 and 11 ), these keys 114 also come axially against the annular shoulder 110 of the housing.
    [0051] Finally, the outer cover 116 is screwed on the outside of the housing, and the legs 122, 124 of the second washer are then folded to immobilize the cover 116 on the ring 100 in rotation (figure 2).
    [0052] According to the invention, all the parts necessary for fixing the reed foot in its radial housing are assembled from the outside of the housing, which makes it possible to quickly dismantle the reeds under the wing in the course of a scale. In addition, the rolling bearings 76, 94 are mounted in the assembled state, and no longer ball by ball as in the prior art, which limits the risks of introducing abrasive elements into the bearings.
    [0053] The centrifugal forces of the operating vanes are transmitted through the support of the coupling teeth 108 of the ring 100 on the coupling teeth 112 of the housing, and not through the thread of screws, which increases the life of the propeller as well mounted.
    [0054] In a variant of the invention, the reed foot has a substantially constant thickness and comprises undulations that operate in conjunction with the complementary undulations of the metal reinforcements, to add adhesion between the reed foot and the internal and external metallic reinforcements . The radius of curvature of the undulations is advantageously greater than 4 mm.
    [0055] The reeds can be made by weaving a material composed of carbon fibers.
    [0056] In the embodiment described with reference to the figures, ring 100 comprises a single annular row of coupling teeth 108. However, the invention also covers embodiments in which locking ring 100 comprises two spaced annular rows of coupling teeth 108 partially from each other, and operating together each with an annular band of teeth coupling the housing. In a first configuration, the two rows of coupling teeth participate simultaneously in the radial support of the reed. In a second configuration the teeth of one of the two rows are supported on the teeth of one row of the housing, while the coupling teeth of the other row are slightly spaced radially in the assembly of the coupling teeth of the other row of the housing and are intended to ensure radial retention and the transmission of centrifugal forces of the reed in case of rupture of the teeth of the first row of the locking ring. This type of configuration is described in detail in the Applicant's previous Application number FR 09/04126.
    [0057] To resist centrifugal forces of the order of 30 tons in operation, the coupling teeth 108 of the locking ring 100 shown in the figures, have an axial thickness of the order of 12 mm. In the case where the locking ring 100 comprises two rows of coupling teeth in simultaneous support, the axial thickness of the coupling teeth is then divided by two and is in the order of 6 mm.
    权利要求:
    Claims (11)
    [0001]
    1. Propeller without fairing for a turbomachine comprising propeller blades mounted for rotation around its axes in the radial housings (36) of a rotor ring element (34), each blades having a cylindrical body foot (38) ) engaged from the outside in a radial housing (36) and guided in rotation around its axis in this housing (36) by two rolling bearings (76, 94), characterized by the fact that a first bearing (76) is taken by an annular rim (78) of the radially internal end of the housing, in which the second bearing (94) is carried by an annular segment (54) with a cylindrical skirt (56) mounted on a throat (50) of the cylindrical body (40) and by a locking nut (64) screwed on the cylindrical skirt (56) of the segment and forming a support spacer on the first bearing (76), the second bearing (94) being covered externally by a ring (100) that surrounds the cylindrical body (40) of the reed foot and has external coupling teeth cores (108) operating in conjunction with the internal coupling teeth (112) in the housing to axially retain the ring (100) in the housing, and in which locking means (114) are engaged between the coupling teeth (112) in the housing between the coupling teeth (108) of the ring (100) to prevent rotation of the ring (100) and its axial removal from the housing.
    [0002]
    2. Propeller, according to claim 1, characterized in that an annular cover (116), which surrounds the reed foot, is screwed on the outer end of the housing to prevent axial removal of the locking means (116).
    [0003]
    3. Propeller according to claim 1 or 2, characterized in that the annular segment (54) is in two parts (66, 68) mounted end to end in the throat (50) of the reed body.
    [0004]
    4. Helix, according to claim 3, characterized in that the cylindrical skirt (56) of the annular segment (54) comprises at least one tooth (62) on an axial projection engaged in a reinforcement (72) of the cylindrical body (40) ) and which flows into the annular throat (50) in order to block the segment (54) on the cylindrical body (40) in rotation.
    [0005]
    5. Propeller according to any one of claims 1 to 4, characterized in that a lock washer (70) is inserted between the nut (64) and the ring segment (54) and cooperates with the connection of shapes with the nut (64) and the segment (54) for rotating the nut (64) on the reed foot.
    [0006]
    Helix according to any one of claims 1 to 5, characterized in that the ring (100) comprises three coupling teeth (108) distributed evenly around its axis and each having an angular extension of approximately 60 °.
    [0007]
    7. Propeller according to any one of claims 1 to 6, characterized in that the locking means comprise keys (114) in the form of a cylinder sector, engaged by axial translation from the outside between the coupling teeth (108 ) of the ring (100) and the coupling teeth (112) of the housing.
    [0008]
    8. Propeller according to claim 2, characterized by the fact that a lock washer (120) is inserted between the cover (112) and the ring (100) and cooperates with the connection of forms with the cover (112) and the ring (100) to make the cover (112) rotating on the ring (100).
    [0009]
    9. Propeller according to any one of claims 1 to 8, characterized by the fact that the reed foot is hollow and comprises metallic reinforcements (44, 46) fixed by gluing on its internal and external faces.
    [0010]
    10. Helix, according to claim 9, characterized by the fact that the wall of the reed foot is of substantially constant thickness and comprises undulations that operate in conjunction with the complementary undulations of the reinforcements.
    [0011]
    11. Turbomachinery, such as a turboprop or airplane turboprop, characterized in that it comprises at least one propeller as defined in any one of claims 1 to 10.
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    同族专利:
    公开号 | 公开日
    CA2794837A1|2011-10-13|
    JP5788492B2|2015-09-30|
    US20130094943A1|2013-04-18|
    EP2555973B1|2015-02-11|
    RU2558411C2|2015-08-10|
    US9328737B2|2016-05-03|
    EP2555973A1|2013-02-13|
    BR112012025186A2|2016-06-21|
    RU2012147582A|2014-05-27|
    CN102834316A|2012-12-19|
    CN102834316B|2015-11-25|
    CA2794837C|2018-01-02|
    FR2958621A1|2011-10-14|
    WO2011124832A1|2011-10-13|
    FR2958621B1|2012-03-23|
    JP2013523526A|2013-06-17|
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-11-05| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-06-30| B09A| Decision: intention to grant|
    2020-10-13| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 01/04/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1001496A|FR2958621B1|2010-04-09|2010-04-09|NON-CARRIED PROPELLER FOR TURBOMACHINE.|
    FR10/01496|2010-04-09|
    PCT/FR2011/050744|WO2011124832A1|2010-04-09|2011-04-01|Unshrouded fan for turbomachine|
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