JP2013126316A - Torque transmission structure of low temperature rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque transmission structure capable of transmitting a torque of a low temperature rotary machine by means of a torque tube made of FRP without being affected by an axial force of a bolt.SOLUTION: In a torque transmission structure 1 of a low temperature rotary machine, provided with a torque tube 10 for transmitting a rotary torque of a rotor core 20 provided with a superconducting coil to a rotor and bolts for fixing the torque tube 10 to the rotor core 20, the torque tube 10 is formed of a fiber-reinforced plastic having a cylindrical part arranged between the rotor core 20 and the rotor and a rotor-core-side flange 11 including a junction surface 12 in the direction right-angled to the axis of the cylindrical part. The junction surface 12 of the rotor-core-side flange 11 and a junction surface 21 of the rotor core 20 have engagement parts 30 which are engaged with each other in the circumferential direction, respectively.

Description

  The present invention relates to a torque transmission structure in a low-temperature rotating machine such as a superconducting motor.

  In recent years, a low-temperature rotating machine such as a superconducting motor may be employed as a driving machine for a machine having a rotating body. As shown in FIG. 5, for example, in the case of the superconducting motor 100, the stationary-side normal coil 101 wound around the outer periphery, the rotor 102 rotating inside the normal coil 101, and the rotor core rotating at the center of the rotor 102 And 104. A rotating-side superconducting coil 103 is wound around the rotor core 104. The rotor core 104 around which the superconducting coil 103 is wound is held in a low temperature state (30 K (−243 ° C.)) by a low temperature helium gas circulated by the refrigerator 105. Thereby, the superconducting coil 103 wound around the rotor core 104 is rotated at a low temperature close to a very low temperature. The rotor core 104 is insulated by setting the space between the rotor 102 and the rotor 102 in a vacuum state.

  The rotor core 104 and the rotor 102 are connected by a torque tube 110. The torque tube 110 supports both ends of the rotor core 104 on the rotor 102, and transmits the rotational force of the rotor core 104 to the rotor 102. The torque tube 110 also supports the weight of the rotor core 104. The torque tube 110 is a cylindrical member that extracts the rotational force generated in the superconducting coil 103. The rotor 102 is rotated by transmitting the rotational force (rotational torque) of the rotor core 104 via the torque tube 110. In this example, the rotational force (torque) of the rotor core 104 is transmitted to the rotor 102 by a torque tube, and the propeller 107 is rotationally driven by the output shaft 106 of the rotor 102. The rotor 102 is supported by bearings 108 provided on the output shaft side and the non-output shaft side.

  The torque tube 110 is formed in a cylindrical shape as described above, and flanges 111 and 112 are provided at both ends thereof. The flanges 111 and 112 have a joint surface 114 orthogonal to the axis of the cylindrical portion 113. One flange portion 111 is fixed to the rotor core 104 with a bolt 115, and the other flange 112 is fixed to the rotor 102 with a bolt 115. Therefore, the torque tube 110 transmits torque by the frictional force of the joint surface 114 between the rotor core 104 and the rotor 102 due to the axial force (force in the axial direction) of the bolt 115. This torque tube 110 connects the rotor core 104 in a low temperature state (30 K (−243 ° C.)) and the rotor 102 at room temperature, and transmits the rotational torque of the rotor core 104 to the rotor 102. Therefore, a metal material is generally used for the torque tube 110.

  However, since the torque tube 110 directly connects the rotor core 104 in the low temperature part (−243 ° C.) and the rotor 102 in the high temperature part (normal temperature) with a metal material, from the rotor 102 in the high temperature part to the rotor core 104 in the low temperature part. The heat input of the occupies most of the cooling loss. Therefore, this heat input becomes a load on the refrigerator 105 that cools the rotor core 104 and affects the efficiency of the superconducting motor.

  Therefore, the present inventor paid attention to FRP (fiber reinforced plastic, which is also simply referred to as “FRP” in the specification and claims) of the composite material having low thermal conductivity as the torque tube. In particular, as shown in Table 1, GFRP (glass fiber reinforced plastic) and CFRP (carbon fiber reinforced plastic) have a tensile strength (MPa) equal to or higher than that of metal (SUS316L), and heat conduction is, for example, The heat conduction integral value (W / m) from extremely low temperature (4K) to room temperature (300K) is very low (for example, CFRP: 242.4 W / m, GFRP: 103.1 W versus SUS316L: 30306 W / m). / M), we thought that high efficiency of the superconducting motor could be expected by reducing the heat input.

なお、この種の先行技術として、超電導巻線と巻線支持体から軸部分へトルクを伝達する手段として、ＦＲＰでトルクチューブを形成し、その筒状のトルクチューブ末端部分を、円周方向に連続する波形に形成し、トルク伝達側はトルクチューブの波形末端部分を挿入する波形の溝状切欠きを設け、この溝状切欠きにトルクチューブの波形末端部分を挿入することにより、円周方向の波形で回転トルクを伝達しようとしたものがある（例えば、特許文献１参照）。

As a prior art of this type, as a means for transmitting torque from the superconducting winding and the winding support to the shaft portion, a torque tube is formed by FRP, and the end portion of the cylindrical torque tube is arranged in the circumferential direction. Formed into a continuous waveform, the torque transmission side is provided with a corrugated grooved notch for inserting the waveform tube end portion of the torque tube, and by inserting the waveform end portion of the torque tube into this groove notch, the circumferential direction There is one that attempts to transmit the rotational torque in the waveform (see, for example, Patent Document 1).

Japanese Patent No. 3774194

  By the way, FRP has a linear expansion coefficient in the stacking direction (4.29 × 10 −6 / K at room temperature), whereas for example, the linear expansion coefficient of metal SUS316L is (15.9 × 10 −6 / K). FRP is more than twice that of metal. Therefore, when FRP is applied to the torque tube 110, the linear expansion coefficient of FRP is larger than that of metal, so that the flanges 111 and 112 are rubbed against the rotor core 102 and the rotor 101 with appropriate axial force by the bolt 115 at room temperature. Even if they are joined, the flange portion 111 fixed to the rotor core 102 is cooled to an extremely low temperature and the amount of thermal contraction increases, so that an axial force drop in which the axial force of the bolt 115 decreases occurs.

  Therefore, when FRP is applied to the torque tube 110, it is difficult to transmit the torque by fixing the flange 111 to the rotor core 102 by the frictional force due to the axial force of the bolt 115.

  As a countermeasure against this, a method of providing a collar between the head of the bolt 115 and the flange 111 so as to reduce the loss of axial force can be considered.

  As a method of providing this color, for example, there is a method of using the same type of color as the bolt 115. In this case, in bolt fastening, since the bolt is extended by the axial force, the axial force corresponding to the extension is generated. Therefore, if the ratio of the length of the FRP to the length of the bolt is reduced by using a collar, the axial force drop of the bolt due to the contraction of the FRP can be reduced.

  However, the coefficient of thermal expansion of FRP varies depending on the manufacturing method and individual, and unless the actual coefficient of thermal expansion is measured, it is difficult to control the axial force, and it is difficult to determine the color at the design stage.

  In the case of Patent Document 1, the amount of heat shrinkage between the groove-shaped notch on the torque transmission side and the waveform end of the torque tube is greatly different. Therefore, the torque tube shrinks in the radial direction due to the difference in the coefficient of thermal expansion, and a gap is generated between the waveform end portion of the torque tube and the groove-shaped notch on the torque transmission side. In particular, when the torque tube is horizontally disposed, a gap may be generated between the upper portion of the torque tube and the groove-shaped notch due to its own weight during rotation, and stable torque transmission at a low temperature is difficult.

  Therefore, an object of the present invention is to provide a torque transmission structure that can transmit the torque of a low-temperature rotating machine without being affected by the axial force of a bolt with an FRP torque tube.

In order to achieve the above object, the present invention provides a rotor core having a superconducting coil, a rotor rotated by the rotor core, a torque tube for transmitting rotational torque of the rotor core to the rotor, and the torque tube to the rotor core. A torque transmission structure for a low-temperature rotating machine having a fastening means for fixing, wherein the torque tube has a cylindrical portion disposed between the rotor core and the rotor, and a joint perpendicular to the axis of the cylindrical portion. A rotor core side flange having a surface is formed of a fiber reinforced plastic, and the joint surface of the rotor core side flange and the joint portion of the rotor core have a meshing portion that meshes in the circumferential direction. The "meshing part" in the document of this specification and claims includes a part that meshes between the "joining surface of the rotor core side flange" and the "joining part of the rotor core" so that torque can be transmitted. If it is. The “fastening means” refers to means for fastening by applying an axial force to the flange, such as “bolts” and “vise”.
With this configuration, a torque tube that transmits torque between the rotor core and the rotor is formed of fiber reinforced plastic to reduce the heat transfer rate, and heat input to the rotor core can be suppressed as much as possible. Moreover, torque transmission between the joint surface of the rotor core and the joint surface of the torque tube can be transmitted by the meshing portion.

Further, the meshing portion may be constituted by a concavo-convex portion formed on the joint surface of the rotor core and a concavo-convex surface meshed with the concavo-convex portion formed on the joint surface of the rotor core side flange. The “concavo-convex shape” in the document of this specification and the claims is a form having “convex portion” and “concave portion” such as “undulation of wavy curved surface”, “square unevenness”, etc. I just need it.
With this configuration, torque is mechanically transmitted by the meshing structure of the uneven surface on the rotor core side flange of the torque tube and the uneven portion of the rotor core, so that even if the axial force of the bolt decreases due to thermal expansion, it is reliable. Torque can be transmitted.

Further, the torque tube is formed of glass fiber reinforced plastic or carbon fiber reinforced plastic, and the rotor core side flange has a concavo-convex shape in which a cross section in a circumferential direction has a curved portion in which fibers of the fiber reinforced plastic are continuous. It may be formed on the meshing surface. The “curved portion where the fibers are continuous” may have any form in which the corner portion is curved by “waveform”, “arc shape” or the like.
If comprised in this way, it can avoid cutting | disconnecting maintaining the circumferential continuity in the flange part of the glass fiber or carbon fiber used as a reinforced fiber, without reducing the intensity | strength of a rotor core side flange and a rotor side flange. A meshing portion can be formed.

Further, the rotor core side flange may have a fixing portion for the fastening means in a concave portion where the thickness of the concave and convex meshing surface is thin.
If comprised in this way, the thickness of the fiber reinforced plastic with a large linear expansion coefficient in the fixing position of a fastening means can be made thin, and the axial force omission of the fastening means by heat contraction can be suppressed.

The fastening means may be a bolt, and a collar of a low thermal expansion material may be provided between the head of the bolt and the rotor core side flange to fix the bolt. As this collar, a metal made of the same material as the bolt or a metal made of a low thermal expansion material is used.
If comprised in this way, the difference of the thermal contraction amount of a fiber reinforced plastic and the thermal contraction amount of a volt | bolt can be made small by the thermal contraction amount of a color | collar, and a bolt axial loss can be reduced.

Further, the amount of heat shrinkage in the axial direction at the fixing position of the bolt is such that the sum of the heat shrinkage amount of the fiber reinforced plastic and the heat shrinkage amount of the collar becomes the heat shrinkage amount of the bolt. And the axial heat shrinkage of the bolt may be set.
With this configuration, the heat shrinkage amount in the axial direction at the bolt fixing position is such that the relation of [heat shrinkage amount of the fiber reinforced plastic + heat shrinkage amount of the color] = [heat shrinkage amount of the bolt] is satisfied. The expansion material collar can be used to reduce the axial force loss of the bolt. In addition, the use of the low thermal expansion material color makes it possible to reduce the thickness of the collar as compared with the case where the same type of color as the bolt is used.

The uneven surface of the rotor core side flange may be a metal ring integrally formed with the fiber reinforced plastic of the rotor core side flange.
If comprised in this way, the shape error of the uneven | corrugated surface engaged with the uneven | corrugated | grooved part of a rotor core becomes small, and the load per location of a meshing part can be made uniform. In addition, when an integrally formed ring is used for the metal ring, the processing of the complicated uneven portion on the rotor core can be simplified, and the processing cost can be reduced.

The joint between the fiber reinforced plastic and the metal ring may be integrated by joining with a base resin at the time of integral molding of the rotor core side flange or by joining using an adhesive after the integral molding.
If comprised in this way, joining of the fiber reinforced plastic and metal ring in a rotor core side flange can be made into the integration which aimed at joint strength improvement.

Moreover, you may arrange | position an annular washer in the anti-joining surface side of the said rotor core side flange.
If comprised in this way, it can prevent that the recessed part of a rotor core side flange deform | transforms with the torque which acts on an uneven | corrugated meshing part.

  According to the present invention, a torque tube for transmitting torque between the rotor core and the rotor is formed of fiber reinforced plastic to reduce heat conduction, and heat input to the rotor core can be suppressed as much as possible.

  In addition, torque transmission between the rotor core and the torque tube is mechanically transmitted by the meshing portion, so that torque can be reliably transmitted even if the axial force of the bolt is reduced due to thermal expansion.

It is sectional drawing of the torque transmission structure which concerns on 1st Embodiment of this invention. It is sectional drawing of the torque transmission structure which concerns on 2nd Embodiment of this invention. It is a perspective view of the torque transmission structure shown in FIG. It is IV-IV sectional drawing shown in FIG. It is a schematic sectional drawing which shows an example of the conventional superconducting motor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiment, a torque transmission structure will be described by partially enlarging the rotor core side flange 11 of the torque tube 10 formed in an annular shape. The torque tube 10 will be described as being made of fiber reinforced plastic (FRP) made of glass fiber or carbon fiber, and the rotor core 20 is made of metal (for example, SUS316L).

  The torque transmission structure 1 of the first embodiment shown in FIG. 1 shows a state in which the rotor core side flange 11 of the torque tube 10 is fixed to the joint portion 21 of the rotor core 20 with a bolt 16 made of metal (for example, SUS316L). . The figure is a cross-sectional view taken along the line II in FIG. The rotor core 20 is a metal rotating body, and the joint portion 21 is provided with a concavo-convex portion 22.

  On the other hand, the end surface of the rotor core side flange 11 is formed on the joint surface 12 provided with the uneven surface 13 that engages with the uneven portion 22 formed on the joint portion 21 of the rotor core 20. The uneven surface 13 of the rotor core side flange 11 and the uneven portion 22 of the rotor core 20 form an uneven engagement portion 30. In this meshing portion 30, the convex portion 14 of the rotor core side flange 11 is engaged with the concave portion 23 of the rotor core 20, and the concave portion 15 of the rotor core side flange 11 is engaged with the convex portion 24 of the rotor core 20.

  And in this embodiment, the bolt hole 25 of the volt | bolt (fastening means) 16 is provided in the convex part 24 of the rotor core 20, and the through-hole 17 of the volt | bolt 16 is provided in the recessed part 15 of the rotor core side flange 11. FIG. The uneven surface 13 of the rotor core side flange 11 is engaged with the uneven portion 22 of the rotor core 20, and the bolt 16 is screwed into the bolt hole 25 provided in the protruded portion 24 of the rotor core 20, whereby the rotor core side flange 11 is fixed to the rotor core 20. Has been.

  In FIG. 1, the state before the uneven | corrugated | grooved part 22 of the rotor core 20 and the uneven | corrugated surface 13 of the rotor core side flange 11 contact | abut completely is shown, and it has described in the state which has the clearance gap S between these. Further, in this drawing, the circumferential gap W formed between the convex portion 24 of the rotor core 20 and the concave portion 15 of the rotor core side flange 11 is exaggerated. The circumferential gap W is preferably made with a minimum gap in terms of the production of the rotor core side flange 11 made of fiber reinforced plastic and the rotor core 20 made of metal.

  Further, as the meshing of the concavo-convex portion 22 and the concavo-convex surface 13 in this embodiment, in this embodiment, the convex portion 24 and the convex portion 14 are engaged with each other on the engaging surface parallel to the axial direction of the torque tube 10. Thus, the rotational torque of the rotor core 20 is efficiently transmitted to the uneven surface 13 provided in the circumferential direction of the torque tube 10 to achieve efficient torque transmission.

  In this embodiment, an annular metal washer 40 is provided on the anti-joint surface side (bolt insertion side) of the rotor core side flange 11. The metal washer 40 is made of the same metal as the bolt 16, for example. By providing the metal washer 40, the force with which the rotor core side flange 11 tries to float by the rotational torque of the rotor core 20 is suppressed.

  Further, in this embodiment, a hollow cylindrical metal collar 50 is inserted and attached to the bolt 16. The collar 50 is made of, for example, a metal having the same material as the bolt 16 or a metal having a low thermal expansion material. The height H of the collar 50 is that the amount of heat shrinkage in the axial direction at the fixing position of the bolt 16 is the sum of the amount of heat shrinkage of FRP and the amount of heat shrinkage of the collar 50 in the rotor core side flange 11. It is preferable that the amount of shrinkage is obtained. Accordingly, the height H of the collar 50 may be determined by the amount of thermal shrinkage.

  With this relationship, the axial heat shrinkage at the bolt 16 fixing position is maintained at a low temperature, with [heat shrinkage of fiber reinforced plastic + heat shrinkage of collar] = [heat shrinkage of bolt]. The axial force loss of the bolt 16 is suppressed.

  Therefore, according to the torque transmission structure 1 according to the first embodiment, even if the axial force loss of the bolt 16 due to the low temperature environment occurs due to the meshing portion 30 between the rotor core side flange 11 and the rotor core 20, the rotational torque can be stabilized. While transmitting, the heat input from the high temperature side can be significantly reduced by the torque tube 10 formed of FRP. Thereby, the efficiency of the refrigerator 105 (FIG. 5) can be increased, and the efficiency of the superconducting motor (low temperature rotating machine) 100 (FIG. 5) can be increased.

  The collar 50 may be omitted depending on the heat shrinkage of the FRP rotor core side flange 11 and the heat shrinkage of the bolt 16.

  2 and 3 show the torque transmission structure 2 according to the second embodiment. In the torque tube 60 of the second embodiment, the rotor core side flange 61 includes a fiber reinforced plastic portion (FRP portion) 62, a metal ring 63, and the like. Has been integrally molded. In addition, since the other structure is the same as the said 1st Embodiment and the uneven | corrugated | grooved part 22 of the rotor core 20 is also the same, the same code | symbol is attached | subjected to the same structure and the description is abbreviate | omitted.

  The rotor core side flange 61 of the second embodiment is provided with a metal ring 63 at a portion that engages with the concave and convex portion 22 of the rotor core 20. The metal ring 63 is integrally formed with the FRP portion 62 of the rotor core side flange 61. A joining surface 64 that contacts the rotor core 20 of the metal ring 63 is formed on the uneven surface 65.

  Further, in the rotor core side flange portion 61 of this embodiment, the surface where the FRP portion 62 and the metal ring 63 are in contact with each other, the convex portion 66 is formed in a wavy curved shape, the concave portion 67 is formed in a straight shape, and the FRP portion is formed. 62 fibers are continuous. The section of the convex portion 66 of the rotor core side flange portion 61 formed in this way is formed such that the FRP portion 62 is thick and the FRP portion 62 is thin in the concave portion 67 as shown in FIG. .

  As described above, the portion formed by the FRP portion 62 of the rotor core side flange 61 is formed so as to be continuous with a curved line using a waveform at the corner portion, and is closer to the rotor core than the torque transmission structure 1 of the first embodiment. The continuity of the FRP fibers continuous in the circumferential direction of the flange 61 is maintained, and the strength is prevented from decreasing. In this example, the waveform is used in part, but as long as the FRP fibers are continuous, a trapezoidal shape, for example, may be used. The form of the surface is not limited to these forms.

  According to the rotor core side flange 61, the metal ring 63 is provided with the uneven surface 65 that engages with the uneven portion 22 provided in the joint portion 21 of the rotor core 20. it can.

  As the integral molding of the FRP portion 62 and the metal ring 63 in the rotor core side flange 61, for example, the shape of the rotor core side flange is formed by laminating glass fiber or carbon fiber cloth in a mold, and the glass fiber or carbon For example, a flange metal is disposed so as to be in contact with the fiber, and a resin is poured into the metal to integrally form it.

  As another method, the rotor core side flange 61 and the metal ring 63 of the form shown in FIG. 2 may be manufactured, and their joint surfaces may be joined with an adhesive to be integrated.

  Therefore, according to the torque transmission structure 2 according to the second embodiment, the fiber continuity in the rotor core side flange 11 is stably maintained, and the meshing portion 30 between the rotor core side flange 11 and the rotor core 20 having high strength reduces the temperature. Even if the axial force of the bolt 16 is lost due to the environment, the rotational torque can be stably transmitted, and the heat input from the high temperature side can be greatly reduced by the torque tube 10 formed by the FRP portion 62. Thereby, the efficiency of the refrigerator 105 (FIG. 5) can be increased, and the efficiency of the superconducting motor (low temperature rotating machine) 100 (FIG. 5) can be increased.

  As described above, in any of the torque transmission structures 1 and 2 described above, the FRP torque tube 10 fixed to the rotor core 20 with an appropriate axial force at room temperature maintains the bolt axial force by contraction of the FRP by maintaining it at a low temperature. Even when the contact portion 30 is lowered, the concave-convex portion 22 of the rotor core 20 and the concave-convex surface 13 of the rotor core-side flange 11 can mechanically engage with each other in the meshing portion 30 to transmit a huge torque. (Low-temperature rotating machine) The amount of heat input to the rotor core 20 of the 100 can be reduced.

  Therefore, it is possible to reduce the load required for the cooler that cools the rotor core 20 of the superconducting motor (low temperature rotating machine) 100 to a very low temperature, and to increase the efficiency of the superconducting motor (low temperature rotating machine) 100.

In the above embodiment, the superconducting motor 100 has been described as an example of the low-temperature rotating machine. However, the low-temperature rotating machine has another configuration as long as the configuration includes the torque tube 10 that extracts the rotational torque from the cryogenic rotor core 20. However, the present invention is not limited to the above embodiment.
Moreover, in the said embodiment, although the volt | bolt 16 is used as a fastening means, if it is a means to give the axial force to the flange 11, for example, a vise, the same effect can be show | played, The present invention is not limited to the above embodiment.

  Further, in the above-described embodiments, the examples in which the collar 50 is used have been described. However, even in the configuration without the collar 50, when the axial force loss of the bolt 16 can be suppressed within an allowable range, the configuration in which the collar 50 is not used. However, the present invention is not limited to the above embodiment.

  The torque transmission structures 1 and 2 may be provided on at least a joint surface that fixes the rotor core side flange portions 11 and 61 of the torque tube 10 to the rotor core 20. Also good.

  Furthermore, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The torque transmission structure according to the present invention can be used as a structure for connecting a rotor core and a rotor in a superconducting motor or the like.

1 Torque transmission structure
2 Torque transmission structure 10 Torque tube 11 Rotor core side flange 12 Joint surface 13 Concavity and convexity 14 Convex part 15 Concave part 16 Bolt (fastening means)
DESCRIPTION OF SYMBOLS 17 Through-hole 20 Rotor core 21 Joint part 22 Concave part 23 Concave part 24 Convex part 25 Bolt hole 30 Engagement part 40 Washer 50 Collar 60 Torque tube 61 Rotor core side flange 62 FRP part 63 Metal ring 64 Joint surface 65 Convex part 66 Convex part 67 Concave part
S clearance
W Circumferential clearance 100 Superconducting motor (low temperature rotating machine)
105 refrigerator

Claims (9)

A low-temperature rotating machine comprising: a rotor core having a superconducting coil; a rotor that is rotated by the rotor core; a torque tube that transmits a rotational torque of the rotor core to the rotor; and a fastening unit that fixes the torque tube to the rotor core. The torque transmission structure of
The torque tube is formed of a fiber reinforced plastic having a cylindrical portion disposed between the rotor core and the rotor, and a rotor core side flange having a joint surface perpendicular to an axis of the cylindrical portion,
A torque transmission structure for a low-temperature rotating machine, wherein a joint surface of the rotor core side flange and a joint portion of the rotor core have a meshing portion that meshes in a circumferential direction.   The said engaging part is comprised by the uneven | corrugated shaped part formed in the joining surface of the said rotor core, and the uneven | corrugated shaped surface which meshes with the said uneven | corrugated shaped part formed in the joint surface of the said rotor core side flange. Torque transmission structure for low-temperature rotating machinery. The torque tube is formed of glass fiber reinforced plastic or carbon fiber reinforced plastic,
The torque transmission of the low-temperature rotating machine according to claim 2, wherein the rotor core side flange has a circumferential cross section formed on a concave and convex meshing surface having a curved portion in which fibers of the fiber reinforced plastic are continuous. Construction.   The torque transmission structure for a low-temperature rotating machine according to claim 2 or 3, wherein the rotor core-side flange has a fixing portion for the fastening means in a concave portion where the thickness of the concave and convex meshing surface is thin. The fastening means is a bolt;
The torque transmission structure for a low-temperature rotating machine according to any one of claims 1 to 4, wherein a collar of a low thermal expansion material is provided between the head of the bolt and the rotor core side flange to fix the bolt.   The amount of heat shrinkage in the axial direction at the bolt fixing position is such that the sum of the heat shrinkage amount of the fiber reinforced plastic and the heat shrinkage amount of the collar becomes the heat shrinkage amount of the bolt. The torque transmission structure for a low-temperature rotating machine according to claim 5, wherein the amount of axial heat shrinkage is set.   The torque transmission structure for a low-temperature rotating machine according to any one of claims 2 to 6, wherein the uneven surface of the rotor core side flange is a metal ring integrally formed with the fiber reinforced plastic of the rotor core side flange.   8. The low temperature according to claim 7, wherein the joint between the fiber reinforced plastic and the metal ring is integrated by joining with a base resin at the time of integral molding of the flange on the rotor core side, or by joining using an adhesive after the integral molding. Torque transmission structure for rotating machinery. The torque transmission structure for a low-temperature rotating machine according to any one of claims 1 to 8, wherein an annular washer is disposed on the anti-joint surface side of the rotor core side flange.

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