• 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 an extraction sleeve (10) for extracting two pieces of revolution assembled by shrinking, said sleeve being characterized in that it comprises: a head (11) having a conical portion; a body (12) of cylindrical shape, the inner portion of the body (12) having a cylindrical screw thread adapted to allow the screwing of an extraction screw; said conical portion of the head (11) of the extraction sleeve (10) forming a friction means adapted to come into contact with one of the revolution pieces, said friction means being dimensioned so as to determine a limit torque sliding greater than the friction torque generated at the thread of the socket by screwing the extraction screw.
    公开号:FR3026331A1
    申请号:FR1459247
    申请日:2014-09-30
    公开日:2016-04-01
    发明作者:Florence Irene Noelle Leutard；Pierrick Raphael Americo Bauduin；Olivier Renon；Patrick Sultana
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD OF THE INVENTION The field of the invention relates to extraction sleeves for disassembly of two parts secured by hooping. The invention finds a particularly advantageous application in the field of aeronautics and allows in particular the extraction of cylindrical hooped connection, such as for example at the interface between the sealing plate and the support tube ejection a turbomachine.
    [0002] BACKGROUND OF THE INVENTION A turbomachine or turbojet engine comprises numerous bolted connections located both in the "stator" part and in the "rotor" part of the turbomachine. Some of these bolted connections are also accompanied by a cylindrical hoop.
    [0003] It is sometimes necessary to disassemble these links, especially during maintenance operations. To dismantle in particular two flanges hooped together, it is customary to use extraction means, such as screw sockets, to avoid damaging the flanges during disassembly. These extraction sleeves are secured to one of the flanges of the interface and allow to separate the two flanges of a fretted connection. To prevent the extraction sleeve from falling during the shrinking operation or to ensure that the torque induced by the extraction screw will be supported by the connection between the extraction sleeve and the flange which supports it, it is known to weld the extraction sleeves.
    [0004] However, the extraction sleeves welded on the flange pose some difficulties. Indeed, the welding of the sleeve may cause deformation of the flange in an area close to the weld, especially when the flanges are of small thickness, for example of the order of a few millimeters, typically of the order of 3 to 4 millimeters. One solution to solve the problems mentioned above is to simply fret the extraction sleeves in the orifices of the flanges that are provided for this purpose. However, with this shrinking solution, there is a risk of slippage of the sleeve in the flange in case of bad sizing of this hoop, which would render unusable the extraction sleeve, in fact it would rotate in its housing during of the extraction attempt, under the effects of the friction of the extraction screw in the threads Io of the sleeve. Another problem could be the deterioration of the socket if the hooping is too important. GENERAL DESCRIPTION OF THE INVENTION In this context, the invention aims to provide a solution to the problems mentioned above, and aims to provide an extraction sleeve to ensure the feasibility of disassembly of two fretted parts and s' free from the use of solder in order to guarantee the flatness of the contact interfaces. To this end, the invention relates to an extraction sleeve for the extraction of two pieces of revolution assembled by shrinking, said sleeve being zo characterized in that it comprises: - a head having a conical portion; - A cylindrical body, the inner portion of the cylindrical body having a screw thread adapted to allow the screwing of an extraction screw; Said conical portion of the head of the extraction sleeve forming a friction means adapted to come into contact with one of the revolution pieces, said friction means being dimensioned so as to determine a sliding limit torque greater than the torque friction generated at the screw thread of the socket by screwing the extraction screw.
    [0005] Thus, the extraction bushing according to the invention makes it possible to dispense with a welding operation of the bushing on the flange, which makes it possible to avoid deformation of the flange, especially when it is thin. (typically of the order of a few millimeters).
    [0006] Thanks to the socket according to the invention, the greater the extraction force, the more the cone of the head of the sleeve generates a significant torque. Thus, the bushing according to the invention makes it possible to extract pieces having hooping with a large extraction force. The extraction sleeve according to the invention may also have one or more of the following characteristics, considered individually or in any technically possible combination: the conical portion of the head has an angle of inclination with respect to the longitudinal axis of the sleeve; the angle of inclination a is between 100 and 60 °; the angle of inclination a is equal to 45 °. The invention also relates to a disassembly extraction system which comprises, for a turbomachine: - a first part of revolution having a fastening flange and a second part of revolution having a fastening flange, the two parts of revolution being assembled by hooping at their fastening flange; a plurality of extraction bushes according to one of the preceding claims; said fastening flange of the first piece of revolution having a plurality of orifices distributed around the periphery of said flange adapted to receive said extraction sleeves; - The extraction sleeve according to the invention is adapted for the extraction of two parts of revolution of a turbomachine assembled by shrinking.
    [0007] Advantageously, the system comprises a plurality of extraction screws having a screw pitch adapted to cooperate with said plurality of extraction sleeves. The invention will be better understood in the light of the description which follows. BRIEF DESCRIPTION OF THE FIGURES Other features and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures. Figure 1 illustrates in perspective a portion of a cylindrical connection, made by shrinking between two parts of revolution of a turbomachine, having a first embodiment of an extraction sleeve according to the invention. FIG. 2 represents a sectional view of the connection illustrated in FIG. 1. FIG. 3 illustrates a second embodiment of an extraction bushing according to the invention. DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION FIG. 1 illustrates in perspective a part of a cylindrical connection, made by hooping, between two parts of revolution of a turbomachine. This type of connection by hooping is in particular carried out in addition to the bolted connections (not shown) made for example between the sealing plate and the ejection tube support of a turbomachine. The assembly of two revolution parts of a turbomachine is achieved by means of fixing flanges. Figure 1 illustrates in particular the two fixing flanges 110 and 120 of the two parts of revolution to be assembled. Figure 2 is a sectional view of this assembly. As seen previously, in addition to the bolting-type fastening means used for assembling two pieces of revolution in a turbomachine, it is also known to make a hot-shrinking connection between these two parts, thus making it possible to achieve additional fixing means. The extraction sleeve 10 according to the invention makes it possible to exert a mechanical stress adapted to disassemble these two fretted parts when the bolting-type connection means are removed. The extraction bushes 10 are positioned on one of the two fastening flanges 110, 120. In the embodiment illustrated in FIGS. 1 and 2, the extraction bushings 10 are positioned on the flange 110 (a single bushing). being illustrated in the figures), so as to extract the flange 120. For this purpose, the flange 110 has a plurality of orifices 111 distributed around the periphery of the flange 110 so as to allow the mounting of the extraction sleeves 10 according to the invention. The distribution of the extraction bushings around the periphery of the flange 110 thus makes it possible to distribute the extraction force over all the bushes 10. The extraction bushing 10 according to the invention has: a first part 11 forming the head of the sleeve 10; this first part 11 being substantially conical in shape; a second part 12 forming the body of the sleeve 10; this second part being substantially cylindrical. Advantageously, the body 12 of the bush 10 has at its second end, ie at the end opposite the head 11 of the bushing 10, a chamfered portion 13 thus decreasing the outside diameter of the body of the bushing 10. This chamfered portion 13 facilitates the positioning of the sleeve 10 in the orifices 111 of the flange 110 during assembly operations. The bushing 10 also has a tapped through bore 14 adapted to receive an extraction screw (not shown). Advantageously, the extraction bushing 10 is threaded with a fine-pitch thread so as to receive conventional extraction screws.
    [0008] The head 11 of the extraction sleeve 10 has a substantially conical shape. The angle of inclination of the cone of the head 11 is denoted a and represents the angle of inclination of the cone relative to the longitudinal axis of the sleeve 10. To integrate the sleeve into the flange 110, the orifice 111 has a countersinking for receiving the milled head 11 (conical) of the sleeve 10. The countersink 111 is made at the face of the flange 110 located at the interface of the two fretted flanges 110, 120. Well Of course, the angle of inclination of the countersink corresponds to the angle of inclination a of the cone of the head 11 of the bushing 10.
    [0009] The bushing 10 is advantageously assembled in force (or cold-shrunk) in the orifices 111, on its cylindrical part to prevent it from falling off the orifice 111 during the handling operations of the flanges or the assembly operations / disassembly. However, the force assembly of the sleeve 10 is not intended to resist the frictional torque generated by the extraction screw in the threads of the sleeve during the extraction operation. Thus, during the screwing of the extraction screw (not shown) in the sleeve 10, the screw will have its free end which abuts against the second flange 120 and the conical portion of the sleeve 10 will come to press against the Milling the orifice 111. The two conical faces in contact then generate a friction torque and the flanges tend to deviate for extraction. The two conical faces will not slide relative to each other as long as the slip limit torque is not reached. This sliding limit torque is a function of: - the angle of inclination a; - The plating force of the sleeve 10 which corresponds to the extraction force required to extract the two fretted flanges 110, 120; - coefficient of friction between the two materials of 110 and 120; - The geometry of the sleeve 10. The sliding limit torque between the two conical parts of the sleeve and the flange or the moment transmissible by the sleeve without it moving is then given by the following formula: - 3 With: - f the coefficient of friction of the conical part between the bushing and the flange: - iiy7 the axial force generated on the bushing by the screwing of the extraction screw: - R the radius of the cone in its most wide relative to the axis of rotation of the bush: - T the radius of the cone in its thinnest part relative to the axis of rotation of the bushing: - at the angle of inclination of the cone. Thus, the angle of inclination a of the cone is determined so that the sliding torque limits between the conical parts is greater than the friction torque induced by the extraction screw during screwing thereof into the sleeve 10.
    [0010] Advantageously, the angle of inclination of the cone is between 100 and 60 °. According to a particularly advantageous embodiment of the invention, the angle of inclination is chosen close to 45 °. However, it is necessary to verify that the angle of inclination a of the selected cone makes it possible to respect certain integration constraints existing in the turbomachine. Thus, it is necessary to respect certain dimensional constraints, in particular the minimum distance of the milling of the orifice 111 relative to the peripheral end of the flange 110, referenced b in FIG. 2, as well as the minimum material thickness. at the rectilinear part of the orifice 111 making it possible to take up the forces of the bushing, referenced a in FIG. 2. By way of example, the minimum distance from the orifice 111 with respect to the end of the flange 110 is typically of the order of 2 to 5 mm, with a minimum value of 1 mm and the thickness of the flange at the rectilinear portion of the orifice 111 is at least equal to 1 mm, and preferably greater than 2 mm. FIG. 3 illustrates an alternative embodiment of the extraction bushing 210 of the invention. In this embodiment, the contact surface is obtained by the shape of the head 211 of the mushroom-shaped bush which has a portion substantially perpendicular to the longitudinal axis of the bushing ending in a chamfered circular shoulder in its portion. lower at an angle of inclination a so as to form a friction cone as described in the first embodiment.
    [0011] Of course, the countersink of the flange 110 is adapted and has a shape complementary to the shape of the head 211 of the sleeve 210.
    权利要求:
    Claims (7)
    [0001]
    REVENDICATIONS1. Extraction sleeve (10, 210) for extracting two pieces of revolution assembled by shrinking, said sleeve being characterized in that it comprises: - a head (11, 211) having a conical portion; - A body (12, 212) of cylindrical shape, the inner portion of the body (12, 212) having a cylindrical screw thread adapted to allow the screwing of an extraction screw; said conical portion of the head (11, 211) of the extraction sleeve (10, 210) forming a friction means adapted to come into contact with one of the revolution pieces, said friction means being dimensioned in a manner to determine a sliding limit torque greater than the friction torque generated at the screw thread of the socket by screwing the extraction screw.
    [0002]
    2. extraction sleeve (10, 210) according to the preceding claim characterized in that the conical portion of the head has an angle of inclination with respect to the longitudinal axis of the sleeve. 20
    [0003]
    3. extraction sleeve (10, 210) according to the preceding claim characterized in that the angle of inclination a is between 100 and 60 °. 25
    [0004]
    4. extraction sleeve (10, 210) according to claim 2 characterized in that the angle of inclination a is equal to 45 °.
    [0005]
    5. extraction sleeve (10, 210) according to one of the preceding claims characterized that it is adapted for the extraction of two parts of revolution of a turbomachine assembled by shrinking.
    [0006]
    6. Disassembly extraction system, which comprises, for a turbomachine: a first piece of revolution having a fastening flange (110) and a second piece of revolution having a fastening flange (120), the two pieces of revolution being assembled by hooping at their fastening flange; a plurality of extraction bushes (10, 210) according to one of the preceding claims; lo - said fastening flange (110) of the first piece of revolution having a plurality of orifices (111) distributed around the periphery of said flange (110) adapted to receive said extraction sleeves (10, 210). 15
    [0007]
    7. System according to the preceding claim characterized in that it comprises a plurality of extraction screws having a screw thread adapted to cooperate with said plurality of extraction sleeves (10, 210). 20
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    同族专利:
    公开号 | 公开日
    RU2017114504A3|2019-04-30|
    CN106715839A|2017-05-24|
    EP3200957B1|2021-01-13|
    RU2720619C2|2020-05-12|
    EP3200957A1|2017-08-09|
    FR3026331B1|2016-11-11|
    US10400810B2|2019-09-03|
    WO2016051080A1|2016-04-07|
    CN106715839B|2019-09-03|
    US20170219002A1|2017-08-03|
    CA2961862A1|2016-04-07|
    BR112017005106A2|2018-01-23|
    RU2017114504A|2018-11-05|
    BR112017005106B1|2021-08-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB654747A|1949-10-21|1951-06-27|Walter Nyffenegger|Improvements in countersunk nuts|
    DE2522817B1|1975-05-23|1976-05-20|Arnold Lutter|DEVICE FOR SEPARATING PIPELINES|
    US20100101065A1|2008-10-24|2010-04-29|Enzo Macchia|Diffuser Case Removal Apparatus and Method|
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    法律状态:
    2015-09-09| PLFP| Fee payment|Year of fee payment: 2 |
    2016-04-01| PLSC| Publication of the preliminary search report|Effective date: 20160401 |
    2016-09-05| PLFP| Fee payment|Year of fee payment: 3 |
    2017-05-17| PLFP| Fee payment|Year of fee payment: 4 |
    2017-11-10| CD| Change of name or company name|Owner name: SNECMA, FR Effective date: 20170713 |
    2018-08-22| PLFP| Fee payment|Year of fee payment: 5 |
    2019-08-20| PLFP| Fee payment|Year of fee payment: 6 |
    2020-08-19| PLFP| Fee payment|Year of fee payment: 7 |
    2021-08-19| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1459247A|FR3026331B1|2014-09-30|2014-09-30|EXTRACTION SLEEVE|FR1459247A| FR3026331B1|2014-09-30|2014-09-30|EXTRACTION SLEEVE|
    RU2017114504A| RU2720619C2|2014-09-30|2015-09-29|Demountable coupling|
    CA2961862A| CA2961862A1|2014-09-30|2015-09-29|Extraction sleeve|
    CN201580050828.0A| CN106715839B|2014-09-30|2015-09-29|Extract sleeve out|
    EP15788113.7A| EP3200957B1|2014-09-30|2015-09-29|Dissassembly extraction systemfor a turbomachine|
    PCT/FR2015/052605| WO2016051080A1|2014-09-30|2015-09-29|Extraction sleeve|
    BR112017005106-0A| BR112017005106B1|2014-09-30|2015-09-29|DISASSEMBLY EXTRACTION SYSTEM FOR A TURBOMACHINE|
    US15/515,446| US10400810B2|2014-09-30|2015-09-29|Extraction sleeve|
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