JP6179295B2 - Cooling structure of rotating electric machine - Google Patents

Description

  The present invention relates to a cooling structure for a rotating electrical machine.

  2. Description of the Related Art Conventionally, in a rotating electrical machine having a rotor that rotates integrally with a rotating shaft body and a wound stator, a rotor that is heated with rotation is cooled with a coolant.

  For example, Patent Document 1 discloses a cooling structure that cools a rotor by fixing an end plate that covers an axial end surface of the rotor to a rotating shaft body and supplying a coolant between the rotor and the end plate. ing. In such a cooling structure, when the rotor rotates, the cooling liquid between the rotor and the end plate concentrates radially outward due to centrifugal force. As the cooling liquid concentrates, the outer end of the end plate in the radial direction is separated from the rotor, creating a gap between the end plate and the rotor, and the cooling liquid leaks from the gap to sufficiently cool the rotor. There is a risk that it will not be. On the other hand, in the structure of Patent Document 1, the outer peripheral end portion of the end plate is brought into contact with the outer peripheral end portion of the rotor, and the radially inner end portion of the end plate is rotated with a preload applied to the rotor side. It is fixed to the shaft.

JP 2009-219186 A

  However, even with the structure of Patent Document 1, it is not possible to sufficiently suppress the occurrence of a gap between the end plate and the rotor, and the coolant leaks from the gap and the rotor cannot be sufficiently cooled. .

  This invention is made | formed in view of this point, and it aims at provision of the cooling structure of the rotary electric machine which can cool a rotor more reliably.

  In order to solve the above-described problems, the present invention provides a cooling structure for a rotating electrical machine, the rotor having a columnar shape extending in a predetermined direction and having a through-hole extending in the axial direction at the center, and the rotor A stator disposed radially outside, a rotary shaft that is inserted into a through-hole of the rotor and rotates integrally with the rotor, and has a first cooling passage through which a coolant passes; and the rotation An end plate that extends radially outward from the outer peripheral surface of the shaft body and covers the axial end surface of the rotor from the axially outer side; and a pressing member that presses the end plate from the axially outer side of the rotor to the rotor side. A second cooling passage that extends in the axial direction of the rotor and through which the coolant passes is formed on the inner side of the rotor, and the end plate is located between the end surface of the rotor in the axial direction It extends radially outward from the outer peripheral surface of the rotary shaft body at a position spaced outward from the axial end surface of the rotor in the axial direction so as to form a space communicating with the first cooling passage and the second cooling passage. A plate portion and an outer abutting portion that protrudes from the plate portion toward the rotor and abuts over the entire outer peripheral end portion of the axial end surface of the rotor, and the pressing member includes the plate portion A cooling structure for a rotating electrical machine is provided, in which a pressing load is applied to a portion radially outward from a radial center between an outer peripheral edge of the rotor and an inner peripheral edge of the rotor (Claim 1).

  According to this structure, the outer peripheral edge and the inner peripheral edge of the rotor of the plate portion of the end plate are pressed by the pressing member while the outer contact portion of the end plate is in contact with the outer peripheral end portion of the axial end surface of the rotor. Since a pressing load directed to the rotor is applied to a portion radially outward from the center in the radial direction, a force directed to the rotor can be effectively applied to the outer abutting portion, and the abutment is more reliably performed. Can be maintained. Therefore, it is possible to more reliably avoid the gap between the outer contact portion and the rotor, that is, the gap between the end plate and the rotor, and the coolant leaking out from the gap.

  In the present invention, the outer contact portion has an outer contact surface that extends along the axial end surface of the rotor and contacts the end surface, and the outer contact surface is arranged in a circumferential direction. A first portion disposed in a portion where the second cooling passage of the rotor axial end surface is open, and a second portion disposed in a portion of the rotor end surface where the second cooling passage is not open. Preferably, at least the first portion is located radially outside the opening portion of the second cooling passage (Claim 2).

  In this way, the outer abutting portion of the end plate and the outer peripheral end portion of the axial end surface of the rotor are abutted while the outer abutting portion avoids blocking the opening portion of the second cooling passage. Can do. Therefore, the flow rate of the coolant can be ensured and the rotor can be cooled more reliably.

  In the present invention, it is preferable that the second portion of the outer abutment surface extends radially outward from a position radially inward of a radially outer edge of the opening of the second cooling passage. ).

  In this way, the contact area between the end plate and the rotor can be increased and the contact between the end plate and the rotor can be made more stable without blocking the opening of the second cooling passage. It is possible to more reliably avoid the occurrence of a gap between them.

  In the present invention, the end plate has an inner contact portion that protrudes from an inner peripheral end portion of the plate portion toward the rotor, and the inner contact portion is formed from the outer side in the axial direction of the rotor. It is preferable that it is in contact with the axial end face or the rotary shaft body.

  In this way, it is possible to suppress the end plate from being deformed when a pressing load directed to the rotor is applied to the end plate from the pressing member. For this reason, the pressing load applied by the pressing member toward the rotor can be appropriately transmitted to the outer contact portion of the end plate, and the contact between the outer contact portion, that is, the end plate and the rotor can be more reliably maintained. .

Further, in the present invention, the stator has a stator core facing the outer peripheral surface of the rotor,
The axial end surface of the rotor protrudes outward in the axial direction from the axial end surface of the stator core,
Preferably, the outer abutting portion extends radially outward from the outer peripheral edge of the rotor and extends to a position overlapping the axial end surface of the stator core as viewed from the axial direction of the rotor .

  In this way, the radial thickness of the outer contact portion can be increased while avoiding interference between the outer contact portion and the stator core, and the outer contact portion, that is, the end plate can be stably applied to the rotor. Can be touched.

In the present invention, the outer contact portion, have the preferred the thickness in the radial direction toward the direction away from the rotor is increased.

  In this way, since the rigidity of the outer contact portion is increased, a large pressing load can be applied to the end plate, and the contact between the end plate and the rotor can be more reliably maintained.

In the present invention, interposed over the whole circumference thereof between the axial end surface of the said outer contact portion rotor, it has the preferred provided with a sealing member for closing the gap between them.

  In this way, the gap between the outer contact portion and the axial end surface of the rotor, that is, the gap between the end plate and the rotor can be more reliably blocked, and the leakage of the coolant can be avoided more reliably. it can.

In the present invention, interposed over the whole circumference thereof between the outer circumferential surface of the end plate and the rotary shaft body, we have the preferred provided with a sealing member for closing the gap between them.

  If it does in this way, it can suppress that a cooling fluid leaks outside from between an end plate and the outer peripheral surface of a rotating shaft body.

In the present invention, have the preferred for the adhesive to the outer peripheral surface of said rotor is applied.

  If it does in this way, it will suppress that the cooling fluid which passes the inner side of a rotor with an adhesive agent leaks outside from the outer peripheral surface of a rotor.

Further, in the present invention, the outer peripheral surface of the rotary shaft body facing the inner peripheral surface of the rotor is partitioned by a pair of side walls provided at both ends of the outer peripheral surface in the axial direction of the rotary shaft body over the entire periphery. A cooling liquid introduction is formed in the rotating shaft body so as to communicate with the first cooling passage and open in the one side wall to introduce the cooling liquid into the groove from the first cooling passage. A passage and a coolant outlet passage communicating with the first cooling passage and opening in the other side wall to return the coolant in the groove to the first cooling passage are formed. It is preferable that the opening portion of the coolant introduction passage and the opening portion of the coolant discharge passage on the other side wall are arranged at different positions in the circumferential direction (Claim 6 ).

  If it does in this way, the internal peripheral surface of a rotor can be cooled with a cooling fluid, and a rotor can be cooled more effectively. In particular, the opening portion of the coolant introduction passage and the opening portion of the coolant discharge passage are disposed at different positions in the circumferential direction. Therefore, the coolant introduced into the groove from the opening of the coolant introduction passage is circulated over a wider area of the groove to increase the contact area between the coolant and the rotor, thereby cooling the rotor more effectively. can do.

In the above configuration, a plurality of partition walls that protrude radially outward from the bottom surface of the groove and extend in the axial direction of the rotating shaft body are provided in the groove at predetermined intervals in the circumferential direction. It has preferred.

  In this way, the coolant introduced into the groove from the opening of the coolant introduction passage can be retained in the groove for a long time, and the chance of contact between the coolant and the rotor can be increased. This provides effective cooling of the rotor.

Further, in the present invention, it has a plurality of magnets arranged inside the rotor and arranged in contact with each other in the axial direction of the rotor, and the magnets arranged in the axial direction of the rotor are arranged inside the rotor. Magnet holes that are inserted and function as the second cooling passages are formed, and the magnets adjacent to each other in the axial direction of the rotor and the positions of the magnet holes are shifted in the circumferential direction with overlapping portions. And a portion of the magnet that is in contact with a magnet adjacent in the axial direction of the rotor is cut out so that a communication area between magnet holes adjacent in the axial direction of the rotor through which the magnet is inserted increases. (Claim 7 ).

  In this way, a communication region between the magnet holes adjacent in the axial direction of the rotor, that is, a communication region of the second cooling passage adjacent in the axial direction is secured, and the flow rate of the coolant passing through the second cooling passage is secured. The Therefore, the rotor can be cooled more reliably.

In the present invention, the end plate and said pressing member has not preferable that are integrally molded.

  In this way, it is possible to increase the rigidity of the end plate and more reliably close the gap between the end plate and the axial end surface of the rotor.

  As described above, according to the present invention, the rotor can be cooled more reliably.

It is a schematic sectional drawing which shows the rotary electric machine provided with the cooling structure of the rotary electric machine which concerns on 1st Embodiment of this invention. It is sectional drawing which decomposes | disassembles and shows a part of rotary electric machine. It is a front view of a rotor. It is the figure which looked at the 2nd end plate from the rotor side. It is the figure which looked at the pressing member from the rotor side. It is a figure which expands and shows a part of FIG. It is a figure for demonstrating a skew structure. It is a figure for demonstrating a skew structure. It is the IX-IX sectional view taken on the line of FIG. It is a figure which shows the modification of a 2nd end plate. (A)-(e) It is a figure which shows the modification of a pressing member, respectively. It is a figure which shows the modification of a 2nd end plate. It is a figure which shows the modification of a 2nd end plate. It is a figure which shows the modification of a 2nd end plate. It is a schematic sectional drawing which shows the cooling structure of the rotary electric machine which concerns on 2nd Embodiment. It is a figure which expands and shows a part of FIG. It is the XVI-XVI sectional view taken on the line of FIG. It is a figure which expands and shows a part of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view of a rotating electrical machine 1 in which a rotating electrical machine cooling structure according to an embodiment of the present invention is used.

  As shown in FIG. 1, the rotating electrical machine 1 includes a rotor shaft (rotary shaft) 10 inserted through a housing 2, a rotor 30 accommodated in the housing 2, a stator 40, a first end plate 20, and a second end. The plate 50, the pressing member 60, and the locking member 70 are included. In the present embodiment, as will be described later, of the first end plate 20 and the second end plate 50, the second end plate 20 is an end plate that is pressed toward the rotor 30 by the pressing member 60.

  FIG. 2 is an exploded cross-sectional view of the rotor 30, the second end plate 50, the pressing member 60, and the locking member 70. FIG. 3 is a front view of the rotor 30. FIG. 4 is a view of the second end plate 50 as viewed from the rotor 30 side. FIG. 5 is a view of the pressing member 60 as viewed from the rotor 30 side. FIG. 6 is an enlarged view of a part of FIG.

  The rotor shaft 10 is a cylindrical member that extends in a predetermined direction. In the rotor shaft 10, a main introduction passage (not shown) through which coolant is introduced and a main lead-out passage (not shown) from which the coolant is led are formed along the axis. Further, in the rotor shaft 10, a plurality of introduction side first cooling passages 11 a (first cooling passages) extending from the main introduction passage toward the outer peripheral surface of the rotor shaft 10 and opening to the outer peripheral surface are formed. A plurality of lead-out side first cooling passages (first cooling passages) 11b extending from the main lead-out passage toward the outer peripheral surface of the rotor shaft 10 and opening to the outer peripheral surface are formed. The introduction side first cooling passage 11 a and the outlet side first cooling passage 11 b are formed at positions separated in the axial direction of the rotor shaft 10. Hereinafter, the axial direction of the rotor shaft 10 is simply referred to as the axial direction or the left-right direction, the right side in FIG. 1 is simply referred to as the right side, the left side in FIG. 1 is simply referred to as the left side, and the radial direction of the rotor shaft 10 is simply referred to as the radial direction. .

  Further, a groove 11c communicating with the introduction-side first cooling passage 11a and the outlet-side first cooling passage 11b is formed over the entire circumference of the outer peripheral surface of the rotor shaft 10 facing the rotor 30.

  The rotor 30 has a magnet inside thereof and rotates integrally with the rotor shaft 10. In the present embodiment, the rotor 30 is formed by laminating electromagnetic steel plates in the axial direction and embedding magnets in the laminated electromagnetic steel plates.

  The rotor 30 has a substantially cylindrical shape as shown in FIGS. An insertion hole 30a extending along the central axis is formed at the center of the rotor 30, and the rotor shaft 10 is inserted into the insertion hole 30a. In the rotor 30, a plurality of magnet holes 32 extending in the axial direction and penetrating the rotor 30 are formed side by side in the circumferential direction at a portion closer to the outer side in the radial direction, and each of the magnet holes 32 extends in the axial direction. A substantially rectangular parallelepiped magnet 33 is inserted. These magnets 33 are arranged so that N-pole magnets and S-pole magnets are alternately arranged, that is, one magnet group composed of N-poles and S-poles is arranged in the circumferential direction. In the present embodiment, eight magnet groups are arranged.

  The magnet hole 32 is larger than the magnet 33, and passages 32 a and 32 b that penetrate the rotor 30 in the axial direction are formed between the inner peripheral surface of the magnet hole 32 and the outer peripheral surface of the magnet 33. Specifically, in each magnet hole 32, a second cooling passage 32 a located on the radially outer side of the magnet 33 and a third cooling passage 32 b located on the radially inner side of the magnet 33 are formed.

  In this embodiment, the rotor 30 has a skew structure, the magnet 33 and the magnet hole 33a are divided in the axial direction, and the positions of the magnets 33 adjacent to each other in the axial direction and the positions of the magnet holes 33a overlap. It has shifted in the circumferential direction in the state having. 7 and 8 are views for explaining the skew structure, and show a part of a schematic front view of the rotor 30. FIG. FIG. 9 is a sectional view taken along line IX-IX in FIG. In the present embodiment, the rotor 30 is divided into two in the axial direction, and two magnets 33 and two magnet holes 33a having different inclinations are arranged in the axial direction. A second cooling passage 32a and a third cooling passage 32b that are shifted in the circumferential direction are formed in each magnet hole 33a. Here, in the rotor 30 having such a skew structure, as shown in FIG. 8, when the magnets 33 adjacent in the axial direction are simply extended with a constant cross-sectional area in the same axial direction, the axial direction The area of the communication portion (the portion indicated by the oblique lines in FIG. 8) of the second cooling passage 32a and the third cooling passage 32b adjacent to the second cooling passage 32a is smaller than the flow passage area of the second cooling passage 32a and the third cooling passage 32b. The flow rate of the coolant passing through the cooling passages 32a and 32b is suppressed to a small value. Therefore, in the present embodiment, as shown in FIGS. 7 and 9, a portion where the magnets 33 adjacent to each other in the axial direction come into contact with each other to reduce the area of the communication portion of the cooling passages 32a and 32b adjacent in the axial direction. The flow rate of the cooling liquid is secured by increasing each.

  As shown in FIGS. 2, 3, etc., the rotor 30 has fourth cooling passages 34 extending in the axial direction and penetrating the rotor 30 at equal intervals in the circumferential direction at a portion radially inward of the magnet hole 32. Is formed. In the present embodiment, eight fourth cooling passages 34 are formed.

  Coolant is introduced into the second, third, and fourth cooling passages 32a, 32b, and 34 formed in the rotor 30, and the rotor 30 is cooled by passing the coolant. Here, as described above, the rotor 30 is formed by laminating a plurality of electromagnetic steel plates. Therefore, in the middle of passing through these cooling passages 32 a, 32 b, 34, the coolant may leak out from the outer peripheral surface of the rotor 30 through the gap between the steel plates. Therefore, in this embodiment, in order to suppress this leakage, the adhesive 80 is applied to the outer peripheral surface of the rotor 30 over the entire periphery.

  As shown in FIG. 1, the stator 40 is obtained by winding a stator core 41 with a winding 42. The stator 40 is arranged on the radially outer side of the rotor 30 with a slight gap from the rotor 30, and the stator core 41 faces the outer peripheral surface of the rotor 30.

  The first end plate 20 and the second end plate 50 cover both axial end faces 36, 38 (left end face 36, right end face 38) of the rotor 30 from the outside in the axial direction, respectively, and between these end faces 36, 38, The first to fourth cooling passages 11a, 11b, 32a, 32b, and 34 communicate with each other to form a space through which the coolant can pass.

  The second end plate 50 that covers the left end surface 36 of the rotor 30 includes a plate portion 51, an outer contact portion 52, and an inner contact portion 53, as shown in FIGS. 2, 4, and 6.

  The plate portion 51 has a disk shape in which an insertion hole 50a through which the rotor shaft 10 is inserted is formed at the center. A groove portion 51b is formed on the inner peripheral surface of the insertion hole 50a. An O-ring (seal member, see FIG. 6) 81 is inserted into the groove 51b.

  The outer contact portion 52 protrudes from the outer peripheral end portion of the plate portion 51 toward the rotor 30 over the entire periphery thereof. In the present embodiment, the outer contact portion 52 has a radial thickness that is set constant in the axial direction and the circumferential direction. The outer abutment surface 52a, which is the front end surface of the outer abutment portion 52, extends along the outer peripheral end portion of the left end surface 36 of the rotor 30, and the entire outer abutment surface 52a contacts the outer peripheral end portion of the left end surface 36 of the rotor 30. It touches. In the present embodiment, the outer contact surface 52a extends radially outward from a position slightly outside the radial outer edge of the opening portion of the second cooling passage 32a in the left end surface 36 of the rotor 30. It arrange | positions so that the opening part of the cooling channel | path 32a may not be obstruct | occluded. The outer abutting surface 52a is formed with a groove 52b that is recessed in the direction away from the rotor 30 over the entire circumference. An O-ring (seal member) 82 is inserted into the groove 52b.

  The inner contact portion 53 protrudes from the inner peripheral end portion of the plate portion 51 toward the rotor 30 over the entire periphery thereof. The front end surface 53 a of the inner contact portion 53 extends along the inner peripheral end portion of the left end surface 36 of the rotor 30, and is in contact with the inner peripheral end portion of the left end surface 36 of the rotor 30 throughout. The inner contact portion 53 is formed with a lead-out passage 53 c that extends in the radial direction and penetrates the inner contact portion 53.

  As described above, in the second end plate 50 configured as described above, the outer contact surface 52a and the outer peripheral end portion of the left end surface 36 of the rotor 30 are in contact with each other, and the tip end surface 53a of the inner contact portion 53 is While contacting the inner peripheral end of the left end surface 36 of the rotor 30, the inner peripheral surface of the insertion hole 50 a formed in the plate portion 51 and the inner peripheral surface of the inner contact portion 53 are in contact with the outer peripheral surface of the rotor shaft 10. The rotor 30 is covered from the outside in the axial direction in a state where the outlet passage 53c and the outlet-side first cooling passage 11b of the rotor shaft 10 communicate with each other. The plate portion 51 of the second end plate 50 and the left end surface 36 of the rotor 30 communicate with the lead-out side first cooling passage 11b via the lead-out passage 53c, and the second, third, and second A space communicating with the four cooling passages 32a, 32b, 34 is formed.

  As shown in FIG. 1, the first end plate 20 has substantially the same configuration as the second end plate 50. That is, the first end plate 20 includes a plate portion 21, an outer contact portion 22, and an inner contact portion 23.

  Similar to the plate portion 51 of the second end plate 50, the plate portion 21 of the first end plate 20 has a disk shape in which an insertion hole 20a through which the rotor shaft 10 is inserted is formed at the center. The insertion hole 20a A groove 21b that is recessed radially outward is formed on the inner peripheral surface of the inner peripheral surface, and an O-ring 83 (seal member) is inserted into the groove 21b.

  The outer abutting portion 22 of the first end plate 20 has substantially the same configuration as the outer abutting portion 52 of the second end plate 50, and extends from the outer peripheral end portion of the plate portion 21 toward the rotor 30 over the entire circumference. It protrudes. In the present embodiment, the outer contact portion 22 has a radial thickness that is set constant in the axial direction and the circumferential direction. The outer abutting surface 22a, which is the front end surface of the outer abutting portion 22, extends along the outer peripheral end of the right end surface 38 of the rotor 30, and the entire outer abutting surface 22a contacts the outer peripheral end of the right end surface 38 of the rotor 30. It touches. In the present embodiment, the outer contact surface 22a extends radially outward from a position slightly outside the radial outer edge of the opening portion of the second cooling passage 32a in the right end surface 38 of the rotor 30. It arrange | positions so that the opening part of the cooling channel | path 32a may not be obstruct | occluded. The outer abutting surface 22a is formed with a groove 22b that is recessed in the direction away from the rotor 30 over the entire circumference. An O-ring (seal member) 84 is inserted into the groove 22b.

  The inner abutting portion 23 of the first end plate 20 has substantially the same configuration as the inner abutting portion 53 of the second end plate 50, and extends from the inner peripheral end of the plate portion 21 toward the rotor 30 over the entire circumference. It protrudes. The inner contact portion 23 is formed with an introduction passage 23 a that extends in the radial direction and penetrates the inner contact portion 23. The second end plate 50 is in contact with the outer peripheral end of the right end surface 38 of the rotor 30 so that the outer contact portion 22 does not block the opening of the second cooling passage 32 a, and the inner contact portion 23 is in the rotor 30. The right end surface 38 of the rotor 30 is covered from the outside in the axial direction in a state in which the inner end of the right end surface 38 is abutted and the introduction passage 23a and the introduction-side first cooling passage 11a communicate with each other. The plate portion 21 of the first end plate 20 and the right end surface 38 of the rotor 30 communicate with the introduction-side first cooling passage 11a through the introduction passage 23a, and the second, third, and second A space communicating with the four cooling passages 32a, 32b, 34 is formed.

  However, in the present embodiment, unlike the second end plate 50, the first end plate 20 is moved in the axial direction by the locking protrusion 13 provided in the rotor shaft 10 in the radial direction, as shown in FIG. By being restricted, it is fixed at a position where it contacts the rotor 30.

  As described above, in the rotating electrical machine 1 of the present embodiment, as shown in FIG. 1, the coolant flows from the main introduction passage and the introduction side first cooling passage 11a to the first end plate 20 through the introduction passage 23a. After being introduced into the space between the right end surface 38 of the rotor 30, the second end is cooled while cooling the rotor 30 through the second, third and fourth cooling passages 32 a, 32 b, 34 formed in the rotor 30. It is discharged into a space between the plate 50 and the left end surface 36 of the rotor 30, and then returns from this space to the main lead-out passage through the lead-out passage 53c and the lead-out side first cooling passage 11b. Further, in the present embodiment, as described above, the grooves 11c communicating with the introduction-side first cooling passage 11a and the outlet-side first cooling passage 11b are respectively formed in the outer surface of the rotor shaft 10 facing the rotor 30. Is formed. Therefore, a part of the coolant flowing into the introduction side first cooling passage 11a is introduced into the groove 11c, and the lead-out side first cooling passage passes through the groove 11c while cooling the inner peripheral surface of the rotor shaft 10. 11b.

  The pressing member 60 is for pressing the second end plate 50 toward the rotor 30 side. As shown in FIGS. 2, 5, 6, and the like, in the present embodiment, the pressing member 60 includes a pressing member side plate portion 61 and a pressing protrusion 62. The pressing member side plate portion 61 has a disk shape extending in parallel with the plate portion 51 of the second end plate 50, and an insertion hole 60 a through which the rotor shaft 10 is inserted is formed at the center thereof. When the rotating electrical machine 1 is assembled, the pressing member 60 is pressed toward the second end plate 50 while inserting the rotor shaft 10 into the insertion hole 60 a and presses the second end plate 50.

  The pressing protrusion 62 protrudes from the outer peripheral end portion of the pressing member side plate portion 61 toward the second end plate 50. The front end surface of the pressing protrusion 62 is in contact with the surface of the second end plate 50, and a pressing force is transmitted from the front end surface of the pressing protrusion 62 to the second end plate 50. As shown in FIG. 6, in the present embodiment, the pressing protrusion 62 is the center between the outer peripheral edge and the inner peripheral edge of the rotor 30 in the radial direction, that is, the distance from the outer peripheral edge of the rotor 30 and the distance from the inner peripheral edge. Extends from the position on the inner side to the position on the outer side of the line m having the same value L. Further, the pressing protrusion 62 is arranged such that the center (line n) in the radial direction is positioned on the outer side in the radial direction with respect to the line m at the center in the radial direction of the rotor 30.

  The locking member 70 is for fixing the pressing member 60 in a state where the second end plate 50 is pressed. In the present embodiment, the locking member 70 is a nut, and the pressing member 60 is screwed into the rotor shaft 10 on the outer side in the axial direction of the pressing member 60 while pressing the pressing member 60 toward the rotor 30. The pressing member 60 is fixed to a position where it contacts the second end plate 50 and presses against the rotor 30 side. The rotor shaft 10 is threaded at a portion where the nut is inserted.

  Next, the effect of the rotating electrical machine cooling structure according to the present embodiment will be described.

  As described above, the coolant flows between the second end plate 50 and the left end surface 36 of the rotor 30 through the cooling passages 32 a, 32 b and 34 formed in the rotor 30. Here, when the rotor 30 rotates, the cooling liquid between the second end plate 50 and the left end surface 36 of the rotor 30 receives a centrifugal force and moves radially outward, and the outer peripheral end of the left end surface 36 of the rotor 30. And the pressure between the outer end of the second end plate 50 increases. Accordingly, a force in a direction away from the rotor 30 is applied to the second end plate 50. On the other hand, in this embodiment, as described above, the radial center position n of the pressing protrusion 62 that transmits the pressing load toward the rotor 30 to the second end plate 50 is the outer peripheral edge of the rotor 30 and the inner edge of the rotor 30. It is located on the radially outer side with respect to the circumferential center (line m) with respect to the peripheral edge, and a pressing load is mainly applied to the outer portion centering on the radially outer portion of the second end plate 50. Therefore, this pressing load can be effectively applied to the outer abutting portion 52 that is the outer peripheral end portion of the second end plate 50 and is in contact with the outer peripheral end of the rotor 30, against the pressure increase. The outer contact portion 52 can be reliably pressed against the rotor 30. Therefore, it is possible to more reliably avoid the occurrence of a gap between the outer abutting portion 52 and the left end surface 36 of the rotor 30 and leakage of the coolant from the gap, thereby reducing the cooling effect. In addition, although the force of the direction away from the rotor 30 acts also on the 1st end plate 20, in this embodiment, the 1st end plate 20 is the axial direction by the latching 13 of the rotor shaft 10 as mentioned above. Movement is regulated. Therefore, when the pressing member 60 presses the second end plate 50 against the rotor 30, the rotor 30 presses the second end plate 20. Thus, in this embodiment, the pressing member 60 presses the second end plate 50 against the rotor 30 and presses the rotor 30 against the first end plate 20. As in the case of the second end plate 50, forces in a direction approaching each other effectively act between the outer abutting portion 22 of the first end plate 20 and the outer peripheral end of the rotor 30. The occurrence of a gap between the outer contact portion 22 and the right end surface 38 of the rotor 30 is also suppressed.

  In particular, in this embodiment, the inner contact portion 53 of the second end plate 50 is in contact with the left end surface 36 of the rotor 30 in the direction toward the rotor 30, that is, the direction in which a pressing load is applied. It is suppressed that the 2nd end plate 50 deform | transforms when it is added. Therefore, the pressing load can be appropriately transmitted to the outer contact portion 52, and the contact between the outer contact portion 52 and the left end surface 36 of the rotor 30 is more reliably maintained.

  In the present embodiment, the outer abutting surface 52a of the outer abutting portion 52 of the second end plate 50 is in contact with the left end surface 36 of the rotor 30 on the radially outer side than the radially outer edge of the second cooling passage 32a. The outer contact surface 52a is configured so as not to block the opening of the second cooling passage 32a. Therefore, a large amount of the coolant that passes through the second cooling passage 32a is secured, and the rotor 30 can be further cooled.

  In the present embodiment, an O-ring 81 is inserted into a groove 51 b formed in the inner peripheral surface of the insertion hole 50 a of the plate portion 51 of the second end plate 50. A gap between the inner peripheral surface of the insertion hole 50a and the outer peripheral surface of the rotor shaft 10 is closed. Therefore, leakage of the coolant from the gap is also suppressed.

  An O-ring 82 is also inserted into a groove 52b formed on the outer abutting surface 52a of the second end plate 50, and the O-ring 82 allows the outer abutting surface 52a and the left end surface 36 of the rotor 30 to be connected. The gap between them is blocked. Therefore, the O-ring 82 also prevents the coolant from leaking out from this gap.

  Furthermore, in the present embodiment, as described above, the adhesive 80 is applied to the outer peripheral surface of the rotor 30 over the entire circumference, and the coolant leaks to the outside through the gap between the steel plates laminated. It is suppressed.

  Here, although the said embodiment demonstrated what has the disk-shaped press member side plate part 61 and the press protrusion 62 which protrudes from the outer peripheral edge part of this press member side plate part 61 as the press member 60. The configuration of the pressing member 60 is not limited to this. The pressing member 60 applies a pressing load toward the rotor 30 to the second end plate 50, and the outer peripheral edge of the rotor 30 and the rotor 30 in the plate portion 51 of the second end plate 50. What is necessary is just to apply a pressing load to the radially outer part from the radial center (line m) with the inner peripheral edge. For example, it may be configured as shown in FIG.

  In the example shown in FIG. 10, the pressing member 160 is screwed into a pressing member side plate portion 161 extending in parallel with the plate portion 51 of the second end plate 50 and a screw hole formed in the pressing member side plate portion 161. It is comprised with the screw 162. FIG. In this example, the screw 162 is a portion that directly applies a pressing load to the second end plate 50, and the pressing member 160 is screwed into the rotor shaft 10 and fixed by the nut 70, and is moved by the tip of the screw 162. The vicinity of the outer contact portion 52 of the second end plate 50 is pressed. The screw 162 that transmits the pressing load to the second end plate 50 is provided on the radially outer side than the radial center line m between the outer peripheral edge of the rotor 30 and the inner peripheral edge of the rotor 30. In the example shown in FIG. 10, the screw 162 is disposed at a position partially overlapping with the outer contact portion 52 of the second end plate 50 as viewed from the axial direction.

  Moreover, you may use a thing of a structure as shown to (a)-(e) of FIG. In each of FIGS. 11A to 11E, the diagram shown on the left side is a front view of the pressing member, and the diagram shown on the right side is a side view. Specifically, the pressing member 260 shown in FIG. 11A is an insertion hole through which the rotor shaft 10 is inserted instead of the disk-shaped plate portion 61 of the pressing member 60 of the embodiment shown in FIG. A plurality of plate-like extension portions 261b extending radially outward from the central portion 260a formed with the same distance in the circumferential direction are used, and the radially outer ends of the plate portions 261 are connected. A pressing protrusion 262 is provided to do this. In the example shown in FIG. 11A, the same number of extending portions 261b as the magnet groups are provided, and eight extending portions 261b are provided corresponding to the eight magnet groups.

  Further, in the pressing member 360 shown in FIG. 11B, instead of the pressing protrusion 262 shown in FIG. 11A, the pressing protrusions 362 are respectively arranged on the rotor 30 side from the radially outer ends of the plurality of extending portions 361b. A protruding portion 363 that protrudes toward the rotor 30 is provided at the central portion 361 a of the plate portion 361 while protruding. Further, the pressing member 460 shown in FIG. 11C is obtained by omitting the protruding portion 363 from the pressing member 360 shown in FIG. 11B, and has a plurality of extensions extending radially outward from the central portion 461a. And a projecting portion 462 projecting from the radially outer end of each extending portion 461b toward the rotor 30 side. Further, the pressing member 560 shown in FIG. 11 (d) is obtained by omitting the protruding portion 462 from the pressing member 460 shown in FIG. 11 (c), and extends outward in the radial direction from the central portion 561a. Only a plurality of extending portions 561b are provided. Further, the pressing member 660 shown in FIG. 11E is provided with a screw 462 instead of the protruding portion 362 of the pressing member 360 shown in FIG.

  In the above description, the case where the pressing member and the second end plate 50 are separate from each other has been described. However, they may be integrally formed. When these are integrally molded, the rigidity between the pressing member and the second end plate 50 is increased, and therefore, the deformation of the second end plate 50 and thus a gap is formed between the second end plate and the rotor 30. Can be more reliably suppressed.

  In the above embodiment, the case where the outer abutting portion 52 of the second end plate 50 has a constant thickness in the axial direction and the circumferential direction has been described. However, the outer abutting portion is configured as shown in FIG. May be. That is, the outer abutment portion 152 shown in FIG. 12 has a radial thickness that increases in the direction away from the rotor 30. In this configuration, since the rigidity of the outer contact portion 152 is increased, a large pressing load can be applied to the second end plate 50, and the contact between the second end plate 50 and the rotor 30 can be more reliably maintained. Can do.

  Further, in the above embodiment, the case where the inner contact portion 54 of the second end plate 50 contacts the axial end surface 36 of the rotor 30 from the outer side in the axial direction has been described. However, as illustrated in FIG. The portion 54 may be brought into contact with the rotor shaft 10 from the outside in the axial direction. Specifically, in the portion of the outer peripheral surface of the rotor shaft 10 that faces the axial end surface 36 of the rotor 30, the portion that faces the rotor 30 is more radial than the portion that is positioned axially outside the rotor 30. The outer step 12 may be formed, and the inner contact portion 54 may be brought into contact with the step 12 from the outside in the axial direction.

  In the above embodiment, the outer abutment surface 52a is shown to be located outside the radially outer edge of the opening portion of the second cooling passage 32a over the entire circumference. You may comprise as shown in FIG. FIG. 13 is a schematic diagram illustrating a portion where the axial end surface 36 of the rotor 30 and the outer contact surface 252a are in contact with each other. In the example shown in FIG. 13, the portion (first portion) 252 b disposed in the portion where the second cooling passage 32 a is opened in the outer abutting surface 252 a is the same as that of the above embodiment. A portion (second portion) 252c that is located outside the radially outer edge of the opening portion, but is disposed in a portion of the outer contact surface 252a where the second cooling passage 32a is not open is a second portion. The cooling passage 32a extends radially outward from a position inside the radially outer edge of the opening portion of the cooling passage 32a, and is in contact with the rotor 30 over a wider area. In this configuration, the contact area between the outer contact surface 252a and the left end surface 36 of the rotor 30 is increased without blocking the opening portion of the second cooling passage 32a, so that the outer contact surface 252a and the rotor 30 The left end face 36 can be stably brought into contact with each other, and the generation of a gap between them can be more reliably avoided.

  Further, as shown in FIG. 14, the outer abutting portion 352 of the second end plate 50 extends radially outward from the outer peripheral edge of the rotor 30, and partially overlaps with the stator core 141 when viewed from the axial direction. May be configured. In this case, in order to avoid interference between the stator core 141 and the outer abutting portion 352, the left end surface 36 of the rotor 30 is preferably projected outward in the axial direction from the axial end surface 141a of the stator core 141. In this way, the radial thickness of the outer contact portion 352 is increased while avoiding interference between the stator core 141 and the outer contact portion 352, thereby increasing the rigidity of the outer contact portion 352. The portion 352 and the rotor 30 can be stably brought into contact with each other, and the occurrence of a gap between them can be more reliably avoided.

  Further, the cooling structure may be applied to a rotating electrical machine 701 having a clutch 790a as shown in FIG. Next, a second embodiment of the cooling structure for a rotating electrical machine of the present invention applied to the rotating electrical machine 701 having the clutch 790a will be described.

  FIG. 16 is an enlarged view of a part of FIG. FIG. 17 is a view of the peripheral wall 793 of the clutch case 790 shown in FIG. 15 as viewed from the radially outer side.

  The rotating electrical machine 701 includes a first rotor shaft 711 and a second rotor shaft 712 that are inserted into the housing 2, and a rotor 730, a stator 740, and a first end plate 720 that are housed in the housing 2 as in the first embodiment. , A second end plate 750 and a pressing member 760. The rotor 730 has substantially the same configuration as the rotor 30 of the first embodiment except that the rotor 730 does not have the third cooling passage. Further, the stator 740 has substantially the same configuration as the stator 40 of the first embodiment. Here, description of the detailed structure of the rotor 730 and the stator 740 is omitted.

  In this rotating electrical machine 701, a clutch case 790 extends radially outward from the outer peripheral surface of the first rotor shaft 711. In this embodiment, the clutch case 790 is formed integrally with the first rotor shaft 711, and the clutch case 790 and the first rotor shaft 711 are inserted through the center of the rotor 730 and rotate integrally with the rotor 730. The rotating shaft body is configured. The clutch 790a is housed inside the clutch case 790. Further, the rotor 730, the first end plate 720, and the second end plate 750 are disposed on the radially outer side of the clutch case 790.

  In this embodiment, the clutch case 790 is formed by disk-shaped side walls 791 and 792 arranged in parallel in the axial direction, and a peripheral wall 793 extending integrally with the right side wall 792 while extending over the outer peripheral ends thereof. The pressing member side plate portion 761, which will be described later, formed integrally with the left side wall 791 is fastened to the peripheral wall 793 by a bolt 763. The rotor 730 is disposed to face the outer peripheral surface of the peripheral wall 793. The first rotor shaft 711 and the side walls 791, 792 and the peripheral wall 793 have a main introduction passage 711 a extending in the radial direction formed in the first rotor shaft 711 and a main portion formed inside the second rotor shaft 712. An introduction-side first cooling passage 791a and a discharge-side first cooling passage 792a are formed, which respectively communicate with the exit passage 712a. These first cooling passages 791 a and 792 a are opened on the outer peripheral surface of the peripheral wall 793.

  As shown in FIG. 16, the first end plate 720 includes a plate portion 721 extending radially outward from the axial right end of the peripheral wall 793 of the clutch case 790, and the rotor 730 side from the radially outer end of the plate portion 721. And an outer projecting portion 722 projecting from the outer surface. The first end plate 720 covers the right end surface 738 from the outside in the axial direction in a state where the outer protrusion 722 is in contact with the right end surface 738 of the rotor 730. Between the first end plate 720 and the right end surface 738 of the rotor 730, the second cooling passage 732a formed in the rotor 730 and the outlet-side first cooling passage 792a communicate with each other as in the first embodiment. A space is formed. The first end plate 720 is formed integrally with the clutch case 790.

  The second end plate 750 has substantially the same configuration as in the first embodiment. That is, the second end plate 750 includes a disk-shaped plate portion 751, an outer abutting portion 752 that protrudes from the outer peripheral end portion of the plate portion 751 toward the rotor 730 over the entire periphery, and the inner periphery of the plate portion 751. And an inner abutting portion 753 projecting from the end portion toward the rotor 730 over the entire circumference. The inner contact portion 753 is formed with an introduction passage 753a that penetrates the inner contact portion 753 in the radial direction. In the second end plate 750, the front end surface (outer contact surface) 752a of the outer contact portion 752 contacts the outer peripheral end portion of the left end surface 736 of the rotor 730, and the front end surface of the inner contact portion 753 is the rotor. 730 is in contact with the inner peripheral end portion of the left end surface 736 of 730 and covers the rotor 30 from the outside in the axial direction in a state where the introduction passage 753a and the introduction-side first cooling passage 791a communicate with each other, and the second end plate 750 Between the plate portion 751 and the left end surface 736 of the rotor 730, a space is formed that communicates with the introduction-side first cooling passage 791a via the introduction passage 753a and communicates with the second cooling passage 732a. In the second embodiment, the inner peripheral surface of the inner contact portion 753 is in contact with the outer peripheral surface of the peripheral wall 793 of the clutch case 790.

  In the rotating electrical machine 701 according to the second embodiment configured as described above, the coolant passes from the main introduction passage 711a formed in the first rotor shaft 711 through the introduction side first cooling passage 791a and the introduction passage 753a. It is introduced into the space between the second end plate 750 and the left end surface 736 of the rotor 30, and cools the rotor 30 through the second cooling passage 732 a while between the first end plate 720 and the right end surface 738 of the rotor 30. And then returns from this space to the main lead-out passage 712a formed in the second rotor shaft 712 through the lead-out side first cooling passage 792a.

  In the second embodiment, the pressing member 760 includes a pressing member side plate portion 761 extending in parallel with the plate portion 751 of the second end plate 750 from the left end portion of the peripheral wall 793 of the clutch case 790 toward the radially outer side, And a screw 762 that is screwed into a screw hole formed in the pressing member side plate portion 761. In the present embodiment, the pressing member side plate portion 761 and the left side wall 791 of the clutch case 790 are integrally formed.

  The screw 762 protrudes from the pressing member side plate portion 761 to the second end plate 750 side, and presses the second end plate 750 at the tip portion thereof. The screw 762 is disposed on the outer side in the radial direction from the center (line m in FIG. 16) between the outer peripheral edge and the inner peripheral edge of the rotor 730. Therefore, the pressing load applied by the pressing member 760 effectively acts on a portion of the second end plate 750 that contacts the outer peripheral end of the rotor 730, that is, the outer contact portion 752. Accordingly, also in the second embodiment, as the rotor 730 rotates, the cooling liquid between the second end plate 750 and the left end surface 736 of the rotor 730 receives a centrifugal force and moves outward in the radial direction. Even if the pressure between the outer peripheral end portion of the left end surface 736 and the outer peripheral end portion of the second end plate 750 increases, the outer contact portion 752 is reliably pressed against the rotor 730 against this pressure increase, It can be suppressed that a gap is generated between the outer contact portion 752 and the left end surface 736 of the rotor 730 and the coolant is leaked from the gap.

  Also in the second embodiment, similarly to the first embodiment, grooves 11c communicating with the introduction-side first cooling passage 11a and the outlet-side cooling passage 11b are formed on the outer peripheral surface of the rotor shaft 10, respectively. A groove 793a that communicates with the introduction-side first cooling passage 791a and the outlet-side cooling passage 792a is formed on the entire outer periphery of the peripheral wall 793 of the clutch case 790 facing the rotor 730. The coolant is introduced into the groove 793a from the introduction-side first cooling passage 791a to cool the inner peripheral surface of the rotor 730 and then led out to the outlet-side cooling passage 792a.

  On the other hand, in the second embodiment, as shown in FIG. 17, a plurality of partition walls 793b extending in the axial direction are arranged in the groove 793a in the circumferential direction. Specifically, the partition wall 793b protrudes radially outward from the bottom surface of the groove 793a. The partition wall 793b is spaced inward in the axial direction from the side walls 793c and 793d on both axial sides of the groove 793a. With this configuration, a circumferential passage 793e extending in the circumferential direction along the side walls 793c and 793d is formed in the groove 793a, and a plurality of axial passages 793f communicating with the circumferential passage 793e are formed. ing. Furthermore, in the second embodiment, an opening 793g of the communication passage that connects the introduction-side first cooling passage 791a and the groove 793a formed on the side wall 793c on one axial side is formed on the other side wall 793d. Further, the opening portion 793h of the communication passage connecting the lead-out side first cooling passage 792a and the groove 793a is displaced in the circumferential direction, and flows into the groove 793a from the opening portion 793g on the introduction side first cooling passage 791a side. The path for the coolant to reach the other opening 793h is lengthened. Therefore, in the second embodiment, the residence time in the groove 793a of the coolant flowing into the groove 793a from the introduction side first cooling passage 791a is lengthened, and the inner peripheral surface of the rotor 730 is sufficiently cooled.

  Specifically, as indicated by the arrows in FIG. 17, the coolant that has flowed into the groove 793a moves in the circumferential direction along the circumferential passage 793e on the introduction side first cooling passage 791a side, and then the axial passage. 793f, and then moves in the circumferential direction along the circumferential passage 793e on the outlet-side first cooling passage 792a side, and then is led out to the outlet-side first cooling passage 792a. As described above, in the second embodiment, the inner peripheral surface of the rotor 730 is further cooled.

  The structure of the groove 793a can also be applied to the first embodiment.

  The present invention is not limited to the above-described embodiment, and can be substituted without departing from the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 20 1st end plate 30 Rotor 40 Stator 50 1st end plate 60 Pressing member

Claims (7)

A cooling structure for a rotating electric machine,
A rotor having a cylindrical shape extending in a predetermined direction and having a through-hole extending in the axial direction at the center;
A stator disposed radially outside the rotor;
A rotating shaft body that is inserted through the through hole of the rotor and rotates integrally with the rotor, and has a first cooling passage through which a coolant passes, and
An end plate extending radially outward from the outer peripheral surface of the rotating shaft body and covering the axial end surface of the rotor from the axially outer side;
A pressing member that presses the end plate from the outer side in the axial direction of the rotor to the rotor side,
Inside the rotor, a second cooling passage is formed that extends in the axial direction of the rotor and through which the coolant passes.
The end plate is spaced outward from the axial end surface of the rotor so that a space communicating with the first cooling passage and the second cooling passage is formed between the end plate and the axial end surface of the rotor. A plate portion that extends radially outward from the outer peripheral surface of the rotating shaft body at a position, and an outer contact portion that protrudes from the plate portion toward the rotor and contacts the entire outer peripheral end portion of the axial end surface of the rotor And
The rotating structure of the rotating electrical machine according to claim 1, wherein the pressing member applies a pressing load to a portion of the plate portion that is radially outward from a radial center between an outer peripheral edge of the rotor and an inner peripheral edge of the rotor. The cooling structure for a rotating electrical machine according to claim 1,
The outer abutting portion has an outer abutting surface that extends along the axial end surface of the rotor and abuts on the end surface,
The outer abutment surface is arranged along a circumferential direction, the first portion disposed in a portion of the axial end surface of the rotor where the second cooling passage is opened, and the second cooling of the axial end surface of the rotor. A second portion disposed in a portion where the passage is not open,
At least the first part is located radially outside the opening part of the second cooling passage. A cooling structure for a rotating electrical machine according to claim 2,
The cooling structure for a rotating electrical machine, wherein the second portion of the outer abutting surface extends radially outward from a position radially inward of a radially outer edge of the opening of the second cooling passage. A cooling structure for a rotating electrical machine according to any one of claims 1 to 3,
The end plate has an inner contact portion that protrudes from an inner peripheral end portion of the plate portion toward the rotor,
The cooling structure for a rotating electrical machine, wherein the inner contact portion is in contact with an axial end surface of the rotor or the rotary shaft body from an outer side in the axial direction of the rotor. A cooling structure for a rotating electrical machine according to any one of claims 1 to 4,
The stator has a stator core facing the outer peripheral surface of the rotor,
The axial end surface of the rotor protrudes outward in the axial direction from the axial end surface of the stator core,
The outer contact portion extends radially outward from the outer peripheral edge of the rotor and extends to a position overlapping the axial end surface of the stator core when viewed from the axial direction of the rotor. Construction. In the cooling structure of the rotary electric machine according to any one of claims 1 to 5 ,
Grooves defined by a pair of side walls provided on both ends of the outer peripheral surface in the axial direction of the rotating shaft body are formed on the outer peripheral surface of the rotating shaft body facing the inner peripheral surface of the rotor. And
A coolant introduction passage that communicates with the first cooling passage and opens on the one side wall, and introduces a coolant into the groove from the first cooling passage; and the first cooling passage. And a cooling liquid outlet passage that opens to the other side wall and returns the cooling liquid in the groove to the first cooling path is formed.
An opening portion of the coolant introduction passage on the one side wall and an opening portion of the coolant lead-out passage on the other side wall are arranged at different positions in the circumferential direction. Cooling structure. In the cooling structure of the rotating electrical machine according to any one of claims 1 to 6 ,
A plurality of magnets arranged inside the rotor and arranged in contact with each other in the axial direction of the rotor;
Inside the rotor, a magnet hole that functions as the second cooling passage is formed while the magnets are inserted in the axial direction of the rotor,
The positions of the magnets adjacent to each other in the axial direction of the rotor and the positions of the magnet holes are shifted in the circumferential direction with overlapping portions,
A portion of the magnet that is in contact with a magnet adjacent in the axial direction of the rotor is cut out so that a communication area between magnet holes adjacent in the axial direction of the rotor through which the magnet is inserted increases. A cooling structure for a rotating electrical machine.