JP6056518B2 - Rotating structure for rotating electrical machine - Google Patents

Description

  The present invention relates to a rotating structure for a rotating electrical machine that includes a rotating shaft and a rotor core that is disposed outside the rotating shaft, and in which the rotating shaft and the radial passages of the refrigerant passages of the rotor core are connected to each other.

  Patent Document 1 describes a rotor core for a rotating electrical machine formed by a laminate of a plurality of nonmagnetic plates and electromagnetic steel plates. The plurality of nonmagnetic plates have a plurality of types of nonmagnetic plates in which radial slits are formed at different radial positions. The end portions of the slits are connected to each other by the nonmagnetic plates adjacent in the axial direction, and a coolant passage is formed in the rotor core to flow cooling oil from the radially inner side to the radially outer side.

JP 2008-228523 A

  In the rotor core for rotating electrical machines described in Patent Document 1, the rigidity of the non-magnetic plate and the electromagnetic steel plate is low, and it is difficult to fix the non-magnetic plate and the electromagnetic steel plate to the outer diameter side of the rotating shaft by an interference fit with a large tightening allowance. It is. For this reason, when a refrigerant passage having a radial passage in a laminated rotor core and a refrigerant passage having another radial passage provided on the rotating shaft are connected between the peripheral surfaces of the rotor core and the rotating shaft. There is a problem that it is difficult to prevent leakage of cooling oil to the outside.

  An object of the present invention is to provide a rotating structure for a rotating electrical machine that can prevent leakage of liquid refrigerant to the outside with a configuration in which a radial rotor passage of a laminated rotor core and a refrigerant passage of a rotating shaft are connected to each other.

A rotating structure for a rotating electrical machine according to the present invention includes a rotating shaft including a shaft-side refrigerant passage having a radial axial-side radial passage, an outer side of the rotating shaft, and is connected to the shaft-side radial passage. A rotor core including a core-side refrigerant passage having a radial core-side radial passage and an axial core-side axial passage connected to the core-side radial passage, and formed by a laminate of a plurality of core plates And one end of the core-side axial passage is closely fixed over the entire circumference of the outer peripheral surface of the rotating shaft and the outer surface of the rotating shaft between the rotor core that opens to one axial end surface of the rotor core . An inner peripheral portion that prevents passage of the liquid refrigerant, and a core pressing portion that is pressed in a ring shape against the axial end surface of the rotor core and prevents passage of the liquid refrigerant between the axial end surface of the rotor core, Fixed outside the rotating shaft It is provided with a two core fixing member sandwiching from both axial sides of the rotor core, one end of the core side axial passage, from the core pressing portion of the core fixing member arranged at one axial end of the rotor core Also, the refrigerant that is disposed on the outer diameter side and flows through the core-side axial passage is jetted outward from one axial end of the rotor core .

  In the rotating structure for a rotating electrical machine according to the present invention, preferably, the core pressing portion of at least one core fixing member of the two core fixing members is radially outer than the inner peripheral portion and the inner portion with respect to the axial direction. It is provided at a position closer to the rotor core than the periphery.

  In the rotating structure for a rotating electrical machine according to the present invention, preferably, at least one core fixing member of the two core fixing members includes an annular plate portion having the inner peripheral portion and an outer periphery of one axial surface of the annular plate portion. The core pressing part is a tip surface of the cylindrical part.

  In the rotating structure for a rotating electrical machine according to the present invention, preferably, an engaging groove provided in an axial direction on a part of the circumferential surface of one of the circumferential surfaces of the rotating shaft and the rotor core facing each other. An engagement protrusion that is provided in an axial direction at a part of the circumferential surface of the other of the circumferential surfaces of the rotating shaft and the rotor core and that engages with the engagement groove, Each core pressing portion is pressed against the end surface in the axial direction of the rotor core at a portion dislocated radially outward from the engagement groove and the engagement protrusion.

  In the rotating structure for a rotating electrical machine according to the present invention, preferably, in at least one core fixing member of the two core fixing members, a contact area between the inner peripheral portion and the outer peripheral surface of the rotating shaft is equal to the core pressing portion. Larger than the contact area between the rotor core and the axial end surface of the rotor core.

  According to the rotating structure for a rotating electric machine of the present invention, the laminated rotor core and the radial passages of the refrigerant passages of the rotating shaft are connected to each other, and the inner peripheral portion of each core fixing member is connected to the outer peripheral surface of the rotating shaft. And the core pressing portion of each core fixing member prevents the liquid refrigerant from passing between the axial end surfaces of the rotor core. For this reason, leakage of the liquid refrigerant from between the inner peripheral surface of the rotor core and the outer peripheral surface of the rotating shaft to the outside can be prevented by the core fixing member.

It is sectional drawing of the rotary electric machine containing the rotary structure for rotary electric machines of embodiment of this invention. It is sectional drawing of the rotating structure for rotary electric machines of embodiment of this invention. It is the A section enlarged view of FIG. It is the figure which looked at the rotation structure of FIG. 2 to the axial direction from the left side. It is BB sectional drawing of FIG. FIG. 4 is an enlarged view corresponding to a portion that coincides with the engagement groove of the rotating shaft and the engagement protrusion of the rotor core in the circumferential direction with respect to part C of FIG. 3. FIG. 6 is a view corresponding to FIG. 5 showing another example of the core fixing member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, the case of a rotating structure with a permanent magnet constituting a permanent magnet type rotating electric machine will be described. However, the present invention is not limited to this, and a rotating structure without a permanent magnet, for example, a cage-shaped rotating structure or a coiled structure. A rotating structure may be used. The rotating electric machine is used as, for example, a motor that drives a hybrid vehicle or an electric vehicle, or a generator, or a motor generator having both functions of a motor and a generator. Below, the same code | symbol is attached | subjected and demonstrated to the same element in all the drawings.

  FIG. 1 shows a cross-sectional view of a rotating electrical machine 10 including a rotating electrical machine rotating structure 14 of the present embodiment. Hereinafter, the rotating structure 14 for a rotating electrical machine is simply referred to as a rotating structure. The rotating electrical machine 10 includes a stator 12 and a rotating structure 14.

  The stator 12 includes a stator core 16 fixed to the case 15 and a multi-phase stator coil 20 wound around a plurality of teeth 18 on the inner peripheral side of the stator core 16. Stator core 16 is formed of a laminate of a plurality of electromagnetic steel plates. In the stator 12, a rotating magnetic field that rotates the magnetic field acting on the rotating structure 14 is generated by passing a plurality of phases of alternating current through the stator coil 20 of the plurality of phases.

  The rotating structure 14 includes a rotating shaft 22 that is rotatably supported by the case 15, a rotor core 24 that is disposed on the outer diameter side of the rotating shaft 22, and a plurality of the rotating structures 14 shown in FIG. Permanent magnets 25n and 25s and two core fixing members 26 fixed to the rotating shaft 22 are included.

  FIG. 2 shows a cross-sectional view of the rotating structure 14 of the present embodiment. FIG. 3 shows an enlarged view of part A of FIG. As shown in FIGS. 2 and 3, the rotating shaft 22 includes a shaft-side refrigerant passage 28 through which cooling oil that is a liquid refrigerant flows. The shaft-side refrigerant passage 28 extends in the radial direction at a plurality of axial-direction axial passages 30 provided along the axial direction in the central portion of the rotation shaft 22 and at a plurality of circumferential positions at the same position in the axial direction of the rotation shaft 22. It is formed by the provided axial side radial passage 32. The radially inner end of each shaft-side radial passage 32 is connected to the shaft-side axial passage 30, and the radially outer end of each shaft-side radial passage 32 opens on the outer peripheral surface of the rotating shaft 22. ATF (Automatic Transmission Fluid) may be used as the cooling oil. The liquid refrigerant may be cooling water.

  The rotary shaft 22 includes a large-diameter cylindrical portion 34 provided at an axially intermediate portion of the outer peripheral surface, and a small-diameter cylindrical portion 36 provided on both axial sides of the large-diameter cylindrical portion 34 and having a smaller diameter than the large-diameter cylindrical portion 34. Including. The large-diameter cylindrical portion 34 has engagement grooves 38 that are recessed in a rectangular shape on the radially inner side so as to extend along the axial direction at two positions opposite to the radial direction. The engagement groove 38 is provided over the entire length of the large-diameter cylindrical portion 34 in the axial direction. Engaging grooves 40 engage with engaging protrusions 40 of the rotor core 24 shown in FIGS.

  FIG. 4 shows the rotary structure 14 of FIG. 2 as viewed in the axial direction from the left side. FIG. 5 shows a cross-sectional view taken along the line BB of FIG. The rotor core 24 is formed by a laminated body of magnetic steel plates 44 and 46 that are a plurality of disk-shaped core plates. Typically, silicon steel plates are used as the magnetic steel plates 44 and 46. The laminate may include a nonmagnetic metal plate. The rotor core 24 includes a core-side refrigerant passage 47 provided inside and a plurality of magnet holes 48.

  The core-side refrigerant passage 47 includes a plurality of core-side axial passages 50 provided so as to penetrate in the axial direction at positions spaced apart from each other in the circumferential direction at the radial intermediate portion of the rotor core 24, and a plurality of core-side radial directions described later. And a passage 52. Each of the plurality of core-side axial passages 50 is formed by connecting axial holes provided in a plurality of locations in the circumferential direction of the respective magnetic steel plates 44 and 46 in the axial direction between adjacent magnetic steel plates 46. The

  The plurality of magnet holes 48 are provided radially outside the core side axial passages 50 inside the rotor core 24. Each of the plurality of magnet holes 48 is formed by adjoining the magnetic holes adjacent to the axial holes provided at a plurality of positions in the circumferential direction outside the holes for the core-side axial passages 50 of the respective magnetic steel plates 44 and 46. It is formed by connecting the steel plates 44 and 46 in the axial direction. Permanent magnets 25n and 25s are inserted and arranged in the respective magnet holes 48. The permanent magnets 25n are arranged so that the radially outer side is the N pole, and the permanent magnets 25s are arranged so that the radially outer side is the S pole. With this configuration, the N pole and the S pole are alternately arranged on the outer peripheral surface of the rotor core 24.

  In FIG. 5, the cross section of the one magnetic steel plate 46 arrange | positioned in the axial direction intermediate part of the rotor core 24 among several magnetic steel plates 44 and 46 is shown. A plurality of radial core-side radial passages 52 are formed in the radially inner portion of the intermediate portion in the axial direction of the rotor core 24 by the radial groove portions formed in the magnetic steel plate 46 and the two magnetic steel plates 44 adjacent to both sides thereof. It is formed. The same number of the plurality of core-side radial passages 52 as the plurality of shaft-side radial passages 32 of the rotating shaft 22 is formed at the same position as each shaft-side radial passage 32 in the circumferential direction. The radially inner end of each core-side radial passage 52 opens to the inner peripheral surface of the rotor core 24, and the radially outer end of each core-side radial passage 52 is connected to the core-side axial passage 50.

  Such a rotor core 24 is arranged on the outer diameter side of the rotating shaft 22 in a state where the rotation with respect to the rotating shaft 22 is prevented by the concave and convex engaging portions of the engaging grooves 38 and the engaging protrusions 40 shown in FIGS. It is arranged by fitting. FIG. 6 shows an enlarged view corresponding to a portion that coincides with the engagement groove 38 of the rotating shaft 22 and the engagement protrusion 40 of the rotor core 24 in the circumferential direction with respect to the portion C of FIG. 3. The concave and convex engaging portions are provided in two axial positions on the opposite side in the radial direction of the large-diameter cylindrical portion 34 of the rotating shaft 22, and on the inner peripheral surface of the rotor core 24. It is formed by the engaging protrusion 40 engaged with. The engagement protrusions 40 are provided to protrude in the radial direction so as to extend along the axial direction at two positions on the radially opposite side of the inner peripheral surface of the rotor core 24. As shown in FIG. 2, the axial length of the rotor core 24 is smaller than the axial length of the engagement groove 38.

  The radially outer end openings of the plurality of axial radial passages 32 of the rotating shaft 22 and the radially inner end openings of the plurality of core side radial passages 52 of the rotor core 24 are the outer peripheral surface of the rotating shaft 22 and the rotor core 24. Connected to the inner peripheral surface. In this case, the term “connection” refers to the outer peripheral surface of the rotating shaft 22 except when the opening end of the axial radial passage 32 and the opening end of the core radial passage 52 are directly butted together. When the radial gap is formed between the inner circumferential surface of the rotor core 24 and the rotor core 24, the axial radial passage 32 and the core radial passage 52 are connected via the gap. In this case, a radial gap is formed in the circumferential direction between the outer peripheral surface of the rotating shaft 22 and the inner peripheral surface of the rotor core 24, so that the plurality of shaft-side radial passages 32 and the plurality of core-side radial passages 52 May be connected via a common radial gap. Further, a core side radial passage and an axial radial passage are respectively formed at a plurality of locations in the axial direction of the rotor core 24 and the rotary shaft 22, and the core side radial passage and the axial radial passage are located at the same position in the axial direction. You may connect each other.

  The two core fixing members 26 are fixed to the outer diameter side of the small-diameter cylindrical portion 36 of the rotating shaft 22 with an interference fit with a large tightening margin, and sandwich the rotor core 24 from both sides in the axial direction. Each core fixing member 26 is fixed to the outer diameter side of the rotating shaft 22, and each core fixing member 26 is pressed and brought into close contact with the rotor core 24, so that the axial thrust force applied from the rotor core 24 is received and applied to the rotating shaft 22. The rotor core 24 is fixed to the rotating shaft 22 by preventing the rotor core 24 from moving in the axial direction.

  As shown in FIG. 3, each core fixing member 26 has an annular plate portion 56 having a cylindrical surface-shaped axially fixed inner peripheral portion 54 on the inner peripheral surface, and an outer peripheral portion on one axial surface of the annular plate portion 56. And a cylindrical portion 58 provided so as to protrude in the axial direction, and is formed in an annular shape having a substantially L-shaped cross section as a whole. The cylindrical portion 58 has a core pressing portion 60 that is a circular flat surface on a tip surface facing in the axial direction. Since each core fixing member 26 is formed in this way, in each core fixing member 26, the core pressing portion 60 is radially outside of the shaft fixing inner peripheral portion 54 and more axial than the shaft fixing inner peripheral portion 54. Is provided on the left side of FIG. The area of the inner peripheral surface of the shaft fixing inner peripheral portion 54 is larger than the area of the core pressing portion 60. Each core fixing member 26 can be formed of either a magnetic metal or a nonmagnetic metal. Each core fixing member 26 may be formed of iron or steel having high rigidity, for example.

  The shaft fixing inner peripheral portion 54 is closely fixed to the periphery of the small diameter cylindrical portion 36 on both sides of the large diameter cylindrical portion 34 of the rotating shaft 22 with a large interference fit over the entire circumference, and between the small diameter cylindrical portion 36. Block the passage of cooling oil. The radial outer end of the axial radial passage 32 of the rotary shaft 22 and the radial inner end of the core side radial passage 52 of the rotor core 24 are between the outer peripheral surface of the rotary shaft 22 and the inner peripheral surface of the rotor core 24. Connected with. The rotor core 24 is not fixed to the outer peripheral surface of the rotary shaft 22 by a large interference fit. For this reason, the cooling oil supplied to the shaft-side axial passage 30 during use can flow through the shaft-side radial passage 32 and leak from the connecting portion between the shaft-side radial passage 32 and the core-side radial passage 52. There is sex. In this case, as shown by the broken arrow α in FIG. 3, the core from the both axial ends of the rotor core 24 passes through the gap at the concave-convex engaging portion or between the outer peripheral surface of the rotating shaft 22 and the inner peripheral surface of the rotor core 24. There is a possibility of entering the inside of the fixing member 26. The shaft-fixed inner peripheral portion 54 is a portion indicated by the oblique lattice P1 in FIG. 3 and prevents passage of the cooling oil between the small-diameter cylindrical portion 36 over the entire circumference.

  Further, the core pressing portion 60 is a portion that is radially outward from the engaging groove 38 and the engaging protrusion 40, and is tightly pressed over the entire circumference of the axial end surface of the rotor core 24, that is, this axial end surface. To prevent the cooling oil from passing between the rotor core 24 and the rotor core 24. The core pressing portion 60 is a portion indicated by the oblique lattice P2 in FIG. 3 and blocks the passage of the cooling oil from the end surface in the axial direction of the rotor core 24 over the entire circumference.

  In each core fixing member 26, the shaft side contact area between the shaft fixing inner peripheral portion 54 and the rotary shaft 22 is larger than the core side contact area between the core pressing portion 60 and the rotor core 24.

  Next, returning to FIG. 1, the use state of the rotating structure 14 will be described. The stator 12 is fixed to the case 15 and the rotating electrical machine 10 is formed by arranging the rotating structure 14 so that the rotor core 24 is opposed to the inner side of the stator 12 in the radial direction. Supply cooling oil. The refrigerant circulation mechanism 64 has a cooling oil pump 68 that sucks the cooling oil accumulated in the lower portion of the case 15 through the pipe 66, and the axial side axial direction of the shaft-side refrigerant passage 28 from the cooling oil pump 68 through the pipe 70. Cooling oil is supplied to the passage 30. Centrifugal force is applied to the cooling oil as the rotating structure 14 rotates, so that the cooling oil flows radially outward in the axial-side radial passage 32 and the core-side radial passage 52, and then a plurality of core sides It flows in the axial direction passage 50 in the axial direction, and is ejected to the outside from both axial directions of the rotor core 24. As the cooling oil passes through the interior of the rotor core 24, the rotor core 24 is cooled. The cooling oil is cooled by the lower part of the case 15 and the pipes 66 and 70. Note that the case 15 may have a configuration in which a gear mechanism is incorporated in addition to the stator 12 and the rotating structure 14. An oil cooler that cools the cooling oil may be provided in the refrigerant circulation path of the refrigerant circulation mechanism 64.

  In the rotating structure 14, the laminated rotor core 24 is disposed on the outer diameter side of the rotating shaft 22, but the rotor core 24 is not fixed to the rotating shaft 22 with a large interference fit, and the outer diameter of the rotating shaft 22 is not fixed. It is arranged with small or no allowance on the side. In such a configuration, there is a possibility that the cooling oil leaks from the connecting portion between the axial-side radial passage 32 of the rotating shaft 22 and the core-side radial passage 52 of the rotor core 24, but the shaft fixing of each core fixing member 26 is possible. The inner peripheral portion 54 prevents the cooling oil from passing between the outer peripheral surface of the rotary shaft 22, and the core pressing portion 60 of each core fixing member 26 passes between the cooling oil and the axial end surface of the rotor core 24. To prevent. For this reason, even when the cooling oil tends to leak from the connecting portion of the radial passages 32 and 52 of the rotating shaft 22 and the rotor core 24, the leakage of the cooling oil to the outside can be prevented by the core fixing member 26. Therefore, the rotor core 24 can be efficiently cooled by the cooling oil.

  Further, since the rotor core 24 includes the permanent magnets 25n and 25s, the temperature of the permanent magnets 25n and 25s increases as the magnetic flux passes through the rotor core 24, and the amount of demagnetization tends to increase. Since the rotor core 24 can be efficiently cooled, demagnetization of the permanent magnets 25n and 25s can be suppressed.

  On the other hand, a rotation structure of a comparative example having the same configuration as that of the present embodiment but not including the core fixing member 26 shown in FIGS. In this comparative example, for example, the rotor core 24 is sandwiched and fixed between a flange portion integrally formed over the entire outer peripheral surface of the rotating shaft 22 and a caulking ring disposed on the outer diameter side of the rotating shaft 22. The caulking ring is fixed to the rotating shaft 22 by being caulked and deformed at one part or a plurality of locations in the circumferential direction on the inner diameter side after being arranged with a clearance fit on the outer diameter side of the rotating shaft 22. In such a comparative example, the cooling oil leaked from the connecting portion between the radial passages of the rotating shaft 22 and the rotor core 24 is the circumferential direction between the outer peripheral surface of the rotating shaft 22 and the inner peripheral surface of the caulking ring. There is a possibility of leaking outside through some parts. In this embodiment, such a problem can be eliminated.

  Further, in each core fixing member 26, the core pressing portion 60 is provided at a position radially outside the shaft fixing inner peripheral portion 54 and closer to the rotor core 24 in the axial direction than the shaft fixing inner peripheral portion 54. The core pressing portion 60 can be brought into contact with the rotor core 24 while avoiding the engagement groove 38 having a long overall length radially inward of the core pressing portion 60. Moreover, since the diameter of the core pressing part 60 is large, the circumferential displacement of the rotor core 24 relative to the rotating shaft 22 can be prevented without excessively increasing the circumferential fixing force between the core fixing member 26 and the rotating shaft 22.

  Further, in each core fixing member 26, the shaft side contact area between the shaft fixing inner peripheral portion 54 and the rotary shaft 22 is larger than the core side contact area between the core pressing portion 60 and the rotor core 24. The fixing force between the rotating shaft 22 and the core fixing member 26 can be increased compared with the case where the contact area is equal to or smaller than the core side contact area. For this reason, even when a metal plate having a high spring constant is used for the rotor core 24, it is possible to efficiently prevent cooling oil from leaking due to the generation of a gap between the rotor core 24 and the core fixing member 26.

  FIG. 7 is a view corresponding to FIG. 6 showing another example of the core fixing member 26. In the configuration of FIG. 7, a concave portion 72 having a tapered surface shape is formed on the inner side of the core pressing portion 60 on the left side surface of FIG. Even in such a configuration, the core pressing portion 60 is provided on the outer side in the radial direction from the shaft fixing inner peripheral portion 54 and at a position closer to the rotor core 24 in the axial direction than the shaft fixing inner peripheral portion 54. For this reason, the leakage of cooling oil to the outside can be prevented efficiently.

  In the above description, the case where the axial lengths of the engaging groove 38 and the large diameter cylindrical portion 34 are larger than the axial length of the rotor core 24 has been described. The length may be equal to or less than the axial length of the rotor core 24. In the above description, the engaging groove 38 is formed on the rotating shaft 22 and the engaging protrusion 40 is formed on the rotor core 24. However, the engaging protrusion is formed on the rotating shaft 22 and the rotor core 24 An engagement groove that engages with the engagement protrusion may be formed. Further, an engaging groove may be formed in both the rotating shaft 22 and the rotor core 24, and both engaging grooves may be used as a key groove for engaging a key of another member to prevent the rotation of the rotor core 24 with respect to the rotating shaft 22. .

  In addition, at least one core fixing member 26 of each core fixing member 26 may be formed in a simple disk shape having a cylindrical cylindrical through hole in the center. In this case, one axial side surface of the disk-shaped core fixing member 26 is a core pressing portion. Further, at least one core fixing member 26 of each core fixing member 26 may use a configuration in which a screw hole is formed on the inner peripheral surface. In this case, the screw hole of the core fixing member 26 is screwed to the male screw portion formed on the outer peripheral surface of the rotating shaft 22. In any case, the core fixing member 26 includes an inner peripheral portion that is closely fixed to the outer peripheral surface of the rotating shaft 22 so as to prevent passage of the liquid refrigerant, and an axial end surface of the rotor core 24. And a core pressing portion that is pressed against the axial end face in a ring shape so as to prevent passage of the liquid refrigerant between them.

  In the above description, the engaging groove 38 is formed in at least one of the rotating shaft 22 and the rotor core 24. However, a configuration in which the engaging groove 38 is not formed in either the rotating shaft 22 or the rotor core 24 is adopted. You can also. For example, when using the structure which does not have the engagement groove | channel along an axial direction in the surrounding surface which mutually opposes as the rotating shaft 22 and the rotor core 24, the rotor core 24 arrange | positioned by the clearance fit on the outer diameter side of the rotating shaft 22 The core fixing member 26 shown in FIGS. 1 to 3, 6, and 7 can be pressed from both sides in the axial direction to prevent the rotation of the rotor core 24 relative to the rotating shaft 22.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Stator, 14 Rotating structure for rotating electrical machine, 15 Case, 16 Stator core, 18 teeth, 20 Stator coil, 22 Rotating shaft, 24 Rotor core, 25n, 25s Permanent magnet, 26 Core fixing member, 28 Axis side refrigerant passage 30 axial side passage, 32 axial side passage, 34 large diameter cylindrical portion, 36 small diameter cylindrical portion, 38 engaging groove, 40 engaging protrusion, 44, 46 magnetic steel plate, 47 core side refrigerant passage, 48 Magnet hole, 50 core side axial passage, 52 core side radial passage, 54 shaft fixed inner peripheral portion, 56 annular plate portion, 58 cylindrical portion, 60 core pressing portion, 64 refrigerant circulation mechanism, 66 piping, 68 cooling oil pump , 70 piping, 72 depressions.

Claims (5)

A rotating shaft including an axial refrigerant passage having a radial axial radial passage;
A radial core-side radial passage disposed outside the rotating shaft and connected to the axial-side radial passage; and an axial core-side axial passage connected to the core-side radial passage. A rotor core that includes a core-side refrigerant passage and is formed of a stack of a plurality of core plates , wherein one end of the core-side axial passage is open to one axial end surface of the rotor core ;
The inner peripheral portion that is tightly fixed over the entire outer periphery of the rotary shaft, prevents passage of liquid refrigerant between the outer peripheral surface of the rotary shaft, and is pressed against the axial end surface of the rotor core in a ring shape, A core pressing portion that prevents passage of the liquid refrigerant between the axial end surfaces of the rotor core, and two core fixing members that are fixed to the outside of the rotating shaft and sandwich the rotor core from both sides in the axial direction;
Equipped with a,
One end of the core side axial passage is disposed on the outer diameter side of the core pressing portion of the core fixing member disposed at one axial end of the rotor core, and the refrigerant flowing through the core side axial passage is the rotor core. A rotating structure for a rotating electrical machine, wherein the rotating structure is ejected outward from one axial end of the rotating electric machine. In the rotating structure for a rotating electrical machine according to claim 1,
The core pressing portion of at least one core fixing member of the two core fixing members is provided at a position radially outward from the inner peripheral portion and closer to the rotor core than the inner peripheral portion in the axial direction. A rotating structure for a rotating electrical machine. The rotating structure for a rotating electrical machine according to claim 2,
At least one core fixing member of the two core fixing members is:
An annular plate having the inner periphery;
A cylindrical portion provided to project in the axial direction on the outer peripheral portion of one axial surface of the annular plate portion,
The rotating structure for a rotating electrical machine, wherein the core pressing portion is a tip surface of the cylindrical portion. In the rotating structure for a rotating electrical machine according to claim 2 or 3,
Of the circumferential surfaces facing each other of the rotating shaft and the rotor core, an engagement groove provided in an axial direction in a part of the circumferential direction of one circumferential surface;
Of the circumferential surfaces of the rotating shaft and the rotor core facing each other, provided in the circumferential direction part of the other circumferential surface in the axial direction, and provided with an engaging protrusion that engages with the engaging groove,
The rotating structure for a rotating electrical machine, wherein each of the core pressing portions is pressed against an end surface in the axial direction of the rotor core at a portion that is radially outward from the engaging groove and the engaging protrusion. The rotating structure for a rotating electrical machine according to any one of claims 1 to 4,
In at least one of the two core fixing members, a contact area between the inner peripheral portion and the outer peripheral surface of the rotating shaft is larger than a contact area between the core pressing portion and the axial end surface of the rotor core. A rotating structure for a rotating electrical machine.

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