JP2022070633A - Rotary electric machine - Google Patents

Abstract

To improve a cooling efficiency in a rotary electric machine.SOLUTION: A rotary electric machine 10 includes a case 20, a stator 30 housed in the case 20, and a rotor 40 disposed on the inner circumferential side of the stator 30. A cooling oil passage 61 through which cooling oil flows is provided in the rotor 40. The cooling oil passage 61 includes a discharge port 67A through which the cooling oil is discharged from the rotor 40. In the case 20 and the stator 30, a first sponge 27, a second sponge 28, and a third sponge 32 are disposed as porous bodies in positions opposed to the discharge port 67A of the cooling oil passage.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rotary electric machine.

The rotary electric machine described in Patent Document 1 includes a case and a stator housed in the case. A rotor is arranged on the inner peripheral side of the stator. Inside the rotor, a cooling oil passage through which cooling oil flows is provided. The cooling oil passage has a discharge port opened on the outer peripheral surface of the rotor. In the rotary electric machine described in Patent Document 1, the cooling oil supplied to the cooling oil passage of the rotor is discharged from the discharge port. Since the rotor is a rotating body, the discharged cooling oil scatters toward the stator on the outer peripheral side due to the centrifugal force during rotation. The cooling oil adhering to the stator flows down the stator and is collected under the case. The cooling oil collected under the case is discharged to the outside of the case, dissipated by the radiator, and then supplied to the rotor again. As described above, in the rotary electric machine described in Patent Document 1, each part is cooled by circulating cooling oil.

Japanese Unexamined Patent Publication No. 2017-20333

In the rotary electric machine described in Patent Document 1, after the cooling oil is supplied from the rotor to the stator, the cooling oil is allowed to flow down the case along the stator. Since the cooling oil flows down the surface of the stator by its own weight, it cannot be said that sufficient time is secured for heat exchange with the stator. The rotary electric machine described in Patent Document 1 does not consider this point, and there is room for improvement.

The rotary electric machine for solving the above problems is a rotary electric machine having a case, a stator housed in the case, and a rotor arranged on the inner peripheral side of the stator, and the rotor is provided with cooling oil. A cooling oil passage is provided, and the cooling oil passage includes a discharge port for discharging cooling oil from the rotor, and at least one of the case and the stator is located at a position facing the discharge port of the cooling oil passage. Is arranged with a porous body.

In the above configuration, the porous body is arranged at a position facing the cooling oil discharge port in at least one of the case and the stator. The cooling oil discharged from the rotor and adhering to the porous body permeates and is retained inside the porous body. Therefore, the cooling oil can stay on the surface of the case or the surface of the stator for a longer time than when the porous body is not provided. Therefore, according to the above configuration, it is possible to contribute to prolonging the time for heat exchange between the cooling oil and the case or the stator, and as a result, it is possible to improve the cooling efficiency of the rotary electric machine.

Sectional drawing which shows the schematic structure of the rotary electric machine. Sectional drawing along line 2-2 of FIG. FIG. 2 is a cross-sectional view taken along the line 3-3 of FIG. The schematic diagram which shows the structure of the magnet hole when the rotor core is seen from the axial direction. The cross-sectional view which shows typically the movement mode of the cooling oil in the case of a rotary electric machine. FIG. 6 is a sectional view schematically showing the configuration of another example of a rotary electric machine. The cross-sectional view schematically showing the movement mode of the cooling oil in a case in another example of a rotary electric machine.

An embodiment of the rotary electric machine will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, the rotary electric machine 10 has a case 20. The case 20 is made of, for example, aluminum. The case 20 is provided at a cylindrical peripheral wall 21, an annular first end wall 22 provided at one end of the peripheral wall 21 (right end in FIG. 1), and the other end of the peripheral wall 21 (left end in FIG. 1). It has a second end wall 23 having an annular shape. Further, the case 20 has a first flange wall 24 having a shape protruding outward (to the right in FIG. 1) from the inner peripheral edge of the first end wall 22. The first flange wall 24 is formed in a cylindrical shape with an open tip. The case 20 is provided with a second flange wall 25 having a shape protruding outward (to the left in FIG. 1) from the inner peripheral edge of the second end wall 23. A disk-shaped connecting wall 26 is connected to the tip of the second flange wall 25.

In the case 20, a first sponge 27, which is a porous body, is fixed to the inner surface of the first end wall 22. The first sponge 27 is made of, for example, urethane, and is fixed to the first end wall 22 by adhesion. The first sponge 27 is formed in the shape of an annulus plate, and its inner peripheral edge is arranged so as to overlap the inner peripheral edge of the first end wall 22.

Further, in the case 20, a second sponge 28, which is a porous body, is fixed to the inner surface of the second end wall 23. The second sponge 28 is made of urethane, for example, and is fixed to the second end wall 23 by adhesion. The second sponge 28 is formed in the shape of an annulus plate, and its inner peripheral edge is arranged so as to overlap the inner peripheral edge of the second end wall 23. The thickness of the second sponge 28 is substantially the same as the thickness of the first sponge 27.

A stator 30 is housed inside the case 20. The stator 30 has a stator core 31 formed in an annular columnar shape by laminating a plurality of magnetic steel sheets which are magnetic materials.
As shown in FIG. 2, the stator core 31 has a yoke 31A formed in an annular shape and a plurality of teeth 31B having a shape protruding radially inward from the inner peripheral surface of the yoke 31A. The outer peripheral surface of the yoke 31A is fixed to the inner peripheral surface of the peripheral wall 21 in the case 20. As a result, the stator 30 is fixed to the case 20. The tip portion of the teeth 31B on the inner side in the radial direction is partially widened. The stator 30 has a third sponge 32 fixed to the inner peripheral surface of the tip portion of the teeth 31B. The third sponge 32 is, for example, a porous body made of urethane. The third sponge 32 is fixed to the inner peripheral surface of the teeth 31B by adhesion, and is provided intermittently in the circumferential direction. The thickness of the third sponge 32 is substantially the same as the thickness of the first sponge 27 and the second sponge 28.

In the stator 30, the slot 31C is partitioned by the adjacent teeth 31B and the yoke 31A. The stator 30 has a coil 33 wound around the slot 31C of the stator core 31. As shown in FIG. 1, both ends of the coil 33 in the stacking direction of the stator core 31 protrude from the stator core 31.

The rotor 40 is arranged on the inner peripheral side of the stator 30 in the case 20. The rotor 40 has a rotor shaft 41 extending in the stacking direction of the stator core 31. Hereinafter, the extending direction of the central axis L of the rotor shaft 41 is simply referred to as an axial direction.

One end of the rotor shaft 41 extends outward through the inner region of the first flange wall 24. The other end of the rotor shaft 41 is arranged in the inner region of the second flange wall 25. The rotor shaft 41 is rotatable on the case 20 via a first bearing 50 fixed to the inner peripheral surface of the first end wall 22 and a second bearing 51 fixed to the inner peripheral surface of the second end wall 23. It is bearing on the axis. The rotor 40 includes a rotor core 42 having an annular pillar shape fixed to the outer peripheral surface of the rotor shaft 41. The rotor core 42 is composed of a laminated body 43 in which a plurality of magnetic steel sheets which are magnetic materials are laminated, and a pair of end plates 48 arranged at both ends of the laminated body 43 in the stacking direction. The end plate 48 is made of, for example, a metal containing iron as a main component.

As shown in FIGS. 2 and 3, the rotor core 42 is provided with a magnet hole 42A penetrating along the axial direction of the rotor shaft 41. That is, the magnet hole 42A is configured by forming holes in each of the electromagnetic steel plate and the end plate 48 constituting the laminated body 43 of the rotor core 42. Electrical steel sheets and end plates 48 are laminated so that these holes communicate with each other.

As shown in FIG. 2, a plurality of magnet holes 42A are arranged side by side in the circumferential direction on the outer peripheral side of the rotor core 42. In this embodiment, the rotor core 42 is provided with eight pairs of magnet holes 42A arranged so as to form a V-shape with the outer peripheral side of the rotor core 42 open at intervals in the circumferential direction. are doing. In the cross section orthogonal to the axial direction of the rotor shaft 41 shown in FIG. 2, the inner peripheral surface of the magnet hole 42A is a pair of inner side surfaces 42B extending in parallel facing each other and a pair of curved inner surfaces connecting the pair of inner side surfaces 42B. It is composed of 42C and. A magnet 49 is arranged in the magnet hole 42A.

The magnet 49 is formed in the shape of a rod having a rectangular cross section. The length of the long side extending in the longitudinal direction of the cross section of the magnet 49 is substantially the same as the length of the pair of inner side surfaces 42B of the magnet hole 42A, and the length of the short side extending in the lateral direction of the cross section is the length of the magnet hole 42A. It is slightly shorter than the distance between the pair of inner side surfaces 42B. The magnet 49 is fixed to the rotor core 42 via a fixing member (not shown) arranged in the gap between the long side and the pair of inner side surfaces 42B of the magnet hole 42A. As the fixing member, a known adhesive sheet or thermal expansion sheet can be adopted. One magnetic pole of the rotor core 42 is formed by the magnets 49 arranged in the pair of magnet holes 42A. As described above, since the pair of magnet holes 42A are provided side by side in the circumferential direction, eight magnetic poles are formed in the rotor core 42 of the present embodiment.

As shown in FIG. 3, the axial length of the magnet 49 is shorter than the axial length of the laminated body 43 of the rotor core 42. That is, in the axial direction, the magnet 49 is shorter than the magnet hole 42A. Among the electromagnetic steel sheets constituting the laminated body 43 of the rotor core 42, the electromagnetic steel sheet on which the magnet 49 is not arranged is referred to as a discharge-side electromagnetic steel sheet 44, and the electromagnetic steel sheet on which the magnet 49 is arranged is referred to as a magnet-accommodating electromagnetic steel sheet 47.

Two discharge-side electrical steel sheets 44 are provided at both ends of the laminated body 43 in the axial direction. Of the two discharging side electromagnetic steel sheets 44, the electromagnetic steel sheet located closer to the magnet 49 is referred to as the first discharging electromagnetic steel sheet 45, and the electromagnetic steel sheet located on the side farther from the magnet 49 is referred to as the second discharging electromagnetic steel sheet 46. The magnet-accommodating electrical steel sheet 47 has the same diameter of the first constituent holes 47A constituting the magnet holes 42A.

On the other hand, as shown in FIG. 4, in the discharge-side electrical steel sheet 44, the second component hole 44A constituting the magnet hole 42A is smaller than the first component hole 47A of the magnet-accommodating electromagnetic steel sheet 47. The second component hole 44A has a 21st component hole 45A constituting the magnet hole 42A in the first discharge electromagnetic steel sheet 45 and a 22nd component hole 46A constituting the magnet hole 42A in the second discharge electromagnetic steel sheet 46.

That is, the 21st constituent hole 45A of the first discharge electromagnetic steel sheet 45 shown by the alternate long and short dash line is smaller than the first constituent hole 47A of the magnet-accommodating electrical steel sheet 47 shown by the alternate long and short dash line in FIG. Further, the 22nd constituent hole 46A of the second electrical steel sheet 46 shown by the broken line in FIG. 4 is smaller than the 21st constituent hole 45A of the first grain electrical steel sheet 45 shown by the alternate long and short dash line in FIG. In the present embodiment, by shortening the distance between the pair of inner side surfaces 42B of the second constituent holes 44A, the second constituent holes 44A are made smaller than the first constituent holes 47A, and the 22nd constituent holes 46A are made smaller. Is smaller than the 21st constituent hole 45A.

The third constituent hole 48A constituting the magnet hole 42A of the end plate 48 shown by the solid line in FIG. 4 is smaller than the second constituent hole 44A of the second electrical steel sheet 46 shown by the broken line in FIG. The third constituent hole 48A of the end plate 48 is arranged at the center of the pair of inner side surfaces 42B in the second constituent hole 44A of the second electrical steel sheet 46. As described above, the hole diameter of the magnet hole 42A, that is, the cross-sectional area of the flow path becomes smaller as the magnet hole 42A becomes farther from the magnet 49. The hole diameter of the magnet hole 42A is the distance between the pair of inner side surfaces 42B. As the hole diameter of the magnet hole 42A, the distance between the vertices of the pair of curved inner surfaces 42C may be adopted.

As shown in FIG. 3, the rotor 40 is provided with a cooling oil passage 61 through which cooling oil flows. The cooling oil passage 61 is formed inside the rotor shaft 41 and has a main passage 62 extending axially in the rotor shaft 41 and a plurality of branch passages 63 extending radially from the tip of the main passage 62. are doing.

Further, the cooling oil passage 61 is formed inside the rotor core 42, and has a plurality of first oil passages 64 provided in the circumferential direction corresponding to the branch passage 63. The first oil passage 64 has a supply port 64A that opens on the inner peripheral surface of the rotor core 42. The supply port 64A communicates with the branch passage 63, and cooling oil is supplied from the branch passage 63. The first oil passage 64 extends radially and is connected to the magnet hole 42A. The first oil passage 64 is composed of slits formed in two magnet-accommodating electrical steel sheets 47 located at the center in the stacking direction in the laminated body 43 constituting the rotor core 42. The slit is formed in a shape cut out from the inner peripheral edge fixed to the rotor shaft 41 in the magnetic steel sheet 47 containing the magnet to the hole constituting the magnet hole 42A.

The cooling oil passage 61 has a second oil passage 65 to which the first oil passage 64 is connected. The second oil passage 65 is partitioned by the inner peripheral surface of the magnet hole 42A and the outer peripheral surface of the magnet 49. That is, when viewed in a cross section orthogonal to the axial direction of the rotor shaft 41, the region surrounded by the pair of curved inner surfaces 42C constituting the magnet hole 42A and the short side of the magnet hole 42A is the flow path of the second oil passage 65. It becomes a cross section. In the second oil passage 65, the central portion to which the first oil passage 64 is connected is referred to as a connecting portion 66.

The second oil passage 65 includes a discharge portion 67 having discharge ports 67A opened on both end faces in the axial direction in the rotor core 42. The discharge unit 67 is composed of a discharge-side electromagnetic steel plate 44 and an end plate 48. The discharge port 67A is formed on the end plate 48. As described above, in the second constituent hole 44A formed in the discharge-side electrical steel sheet 44 and the third constituent hole 48A formed in the end plate 48, the farther from the magnet 49, that is, the closer to the discharge port 67A. It is provided so that it becomes smaller. As a result, in the second oil passage 65, the flow path cross-sectional area of the discharge portion 67, particularly the discharge port 67A, is smaller than the flow path cross-sectional area of the connection portion 66.

In the following, of the pair of end plates 48, the discharge port 67A provided on the end plate 48 located on the first end wall 22 side of the case 20 is referred to as the first discharge port 671A, and the second end of the case 20. The discharge port 67A provided on the end plate 48 located on the wall 23 side is referred to as a second discharge port 672A. The first discharge port 671A is provided at a position facing the first end wall 22, and the second discharge port 672A is provided at a position facing the second end wall 23. Therefore, the first sponge 27 fixed to the first end wall 22 is arranged at a position facing the first discharge port 671A. Further, the second sponge 28 fixed to the second end wall 23 is arranged at a position facing the second discharge port 672A.

Further, the cooling oil passage 61 includes a third oil passage 68 and a fourth oil passage 69 extending radially from the second oil passage 65 and opening on the outer peripheral surface of the rotor core 42. The third oil passage 68 is connected to the second oil passage 65 on the side of the first discharge port 671A with respect to the connecting portion 66. The fourth oil passage 69 is connected to the second oil passage 65 on the side of the second discharge port 672A with respect to the connecting portion 66. The third oil passage 68 and the fourth oil passage 69 are each composed of slits formed in one magnet-containing electrical steel sheet 47 in the laminated body 43 constituting the rotor core 42. The slit is formed in a shape cut out from the first constituent hole 47A in the magnet-accommodating electrical steel sheet 47 to the outer peripheral edge. The third discharge port 68A opened on the outer peripheral surface of the rotor core 42 in the third oil passage 68 is provided at a position facing the inner peripheral surface of the teeth 31B of the stator core 31. Further, the fourth discharge port 69A opened on the outer peripheral surface of the rotor core 42 in the fourth oil passage 69 is provided at a position facing the inner peripheral surface of the teeth 31B of the stator core 31. Therefore, the third sponge 32 fixed to the inner peripheral surface of the stator core 31 is arranged at a position facing the third discharge port 68A and the fourth discharge port 69A.

As shown in FIG. 1, the cooling oil supplied to the rotary electric machine 10 is collected below the case 20 of the rotary electric machine 10. A part of the stator core 31 is immersed in this cooling oil. The first sponge 27 and the second sponge 28 are not immersed in the cooling oil accumulated under the case 20. A drainage port 21A is provided below the peripheral wall 21 in order to drain the cooling oil accumulated under the case 20. The drainage port 21A is connected to the radiator 70. The cooling oil that has flowed from the drain port 21A to the radiator 70 dissipates heat by heat exchange with air in the radiator 70, and then is returned to the oil pan 75. The cooling oil returned to the oil pan 75 is pumped up by the oil pump 80 and supplied to the main passage 62 of the rotor shaft 41. The cooling oil supplied to the main passage 62 flows in order from the branch passage 63 through the first oil passage 64 and the second oil passage 65 to cool the rotor shaft 41, the rotor core 42, and the magnet 49. After that, from the first discharge port 671A and the second discharge port 672A of the second oil passage 65, the third discharge port 68A of the third oil passage 68, and the fourth discharge port 69A of the fourth oil passage 69 to the outside of the rotor 40. It is discharged. Since the second oil passage 65 is composed of the outer peripheral surface of the magnet 49, the magnet 49 and the cooling oil come into direct contact with each other, and the magnet 49 is suitably cooled.

Next, the operation and effect of this embodiment will be described.
(1) In the second oil passage 65, the flow path cross-sectional area of the discharge portion 67 for discharging the cooling oil is smaller than the flow path cross-sectional area of the connection portion 66 connected to the first oil passage 64. As the cross-sectional area of the flow path becomes smaller, the speed of the cooling oil flowing through the discharge portion 67 of the second oil passage 65 increases. Therefore, the speed of the cooling oil when it is discharged from the second oil passage 65 is faster than the speed of the cooling oil when it is supplied to the second oil passage 65.

As shown by the solid arrow in FIG. 5, by increasing the flow rate of the cooling oil discharged from the discharge portion 67 of the rotor core 42, the rotor core 42 is ejected from the discharge port 67A in the axial direction of the rotor shaft 41. Cooling oil is discharged from. Since centrifugal force acts when the rotor 40 is rotating, the cooling oil is ejected so as to be located radially outward toward the case 20.

In the present embodiment, the first sponge 27 or the second sponge 28 is arranged at a position facing the cooling oil discharge port 67A in the case 20. Therefore, the cooling oil discharged from the rotor 40 reaches the first sponge 27 or the second sponge 28, permeates and is retained inside these.

The case 20 has a relatively low temperature in the rotary electric machine 10 as compared with other parts. Therefore, the cooling oil that has reached the case 20 dissipates heat through the case 20. Since the cooling oil permeates the first sponge 27 and the second sponge 28, it is possible to stay on the surface of the case 20 longer than when the first sponge 27 and the second sponge 28 are not provided. Become. After that, as shown by the arrow of the alternate long and short dash line in FIG. 5, the cooling oil moves downward along the case 20 by its own weight, is discharged from the first sponge 27 or the second sponge 28, and is collected under the case 20. ..

By flowing the cooling oil through the case 20 in this way, it is possible to contribute to lowering the temperature of the cooling oil accumulated under the case 20. Then, since such cooling oil can be circulated after being radiated again in the radiator 70, it becomes possible to circulate the cooling oil at a lower temperature in the rotary electric machine 10.

Further, as shown by the arrow of the alternate long and short dash line in FIG. 5, the cooling oil discharged from the third discharge port 68A and the fourth discharge port 69A of the rotor core 42 is scattered to the inner peripheral surface of the stator core 31 by centrifugal force. A third sponge 32 is arranged at a position of the stator core 31 facing the third discharge port 68A and the fourth discharge port 69A of the cooling oil. Therefore, the cooling oil discharged from the rotor 40 reaches the third sponge 32, permeates and is held inside the third sponge 32. The cooling oil that has permeated into the third sponge 32 receives heat from the stator core 31 and cools the stator 30. Since the cooling oil permeates the third sponge 32, it can stay on the surface of the stator 30 for a longer time than when the third sponge 32 is not provided. After that, the cooling oil moves downward along the stator 30 by its own weight and is collected under the case 20. By flowing the cooling oil through the stator 30 in this way, the amount of heat received from the stator 30 of the cooling oil can be increased.

In this way, by lengthening the time for heat exchange between the cooling oil and the case 20 and the stator 30, it is possible to increase the amount of heat received from the stator 30 while increasing the amount of heat dissipated from the cooling oil through the case 20. This makes it possible to improve the cooling efficiency of the rotary electric machine 10.

(2) In the present embodiment, the discharge portion 67 of the second oil passage 65 is composed of two discharge-side electromagnetic steel sheets 44 and an end plate 48. Then, in the discharge portion 67, the sizes of the second constituent holes 44A and the third constituent holes 48A constituting the magnet holes 42A are formed so as to be gradually smaller toward the discharge port 67A. By gradually reducing the cross-sectional area of the flow path of the discharge portion 67 in this way, it is possible to suppress an increase in the pressure loss of the second oil passage 65 due to the reduction of the cross-sectional area of the flow path.

Therefore, since the flow velocity of the cooling oil flowing through the discharge portion 67 of the second oil passage 65 can be further increased, it is possible to ensure the arrival of the cooling oil from the rotor 40 to the case 20. As a result, it can contribute to further improvement of the cooling efficiency of the rotary electric machine 10.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
-In the above embodiment, the discharge section 67 of the second oil passage 65 is configured so that the cross-sectional area of the flow path gradually decreases toward the discharge port 67A, but such a configuration may be omitted. That is, the cross-sectional area of the flow path may be gradually reduced in the discharge portion 67 of the second oil passage 65. In this case, it is possible to set two stages, that is, a portion having a small flow path area including the discharge port 67A and a portion having a larger flow path area than the portion.

In the above embodiment, in the second oil passage 65, the flow path cross-sectional area of the discharge portion 67 may be the same as the flow path cross-sectional area of the connection portion 66, or the flow path cross-sectional area of the discharge portion 67 may be the same as the flow path cross-sectional area of the connection portion 66. It may be larger than the cross-sectional area of the flow path of. Even in such a case, it is possible to eject the cooling oil from the rotor 40 to the case 20 by increasing the driving amount of the oil pump 80 or the like.

-In the above embodiment, the lower end of the first sponge 27 and the lower end of the second sponge 28 may be immersed in the cooling oil accumulated under the case 20. Further, the third sponge 32 may not be fixed to all the teeth arranged in the circumferential direction, but may be fixed to only a part of the teeth. Further, the third sponge 32 may not be provided intermittently in the circumferential direction, but may be continuously provided in the circumferential direction, that is, continuously so as to straddle the opening of the slot 31C.

-In the above embodiment, the thicknesses of the first sponge 27, the second sponge 28, and the third sponge 32 may be set differently. For example, when it is desired to give priority to increasing the amount of heat received from the stator 30 of the cooling oil rather than the amount of heat dissipated through the case 20 of the cooling oil, the thickness of the third sponge 32 is increased to the thickness of the first sponge 27 and the second sponge. It may be made thicker than the thickness of 28. Further, any one or two of the first sponge 27, the second sponge 28, and the third sponge 32 may be omitted.

-In the above embodiment, an example in which the first sponge 27, the second sponge 28, and the third sponge 32 are fixed by adhesion has been described, but these fixing methods are not limited to these. For example, when the first sponge 27, the second sponge 28, and the third sponge 32 are configured by using a non-adhesive material such as polyetherimide, they are fastened to the case 20 or the stator 30 with bolts. The method of fixing with is useful. As described above, as the fixing method, the optimum method according to the material may be adopted.

In the above embodiment, the configuration in which the discharge ports 67A are provided on both end faces in the axial direction of the rotor core 42 is exemplified, but the discharge ports 67A may be formed on one end surface in the axial direction. That is, at least one of the first discharge port 671A and the second discharge port 672A may be omitted.

In the above embodiment, the first oil passage 64 of the cooling oil passage 61 is configured to linearly connect the magnet hole 42A from the supply port 64A in the radial direction. Such a configuration can be changed as appropriate. For example, the first oil passage 64 may be branched from the supply port 64A and connected to the magnet holes 42A at a plurality of points in the axial direction.

In the above embodiment, an example in which the second oil passage 65 is composed of the inner peripheral surface of the magnet hole 42A and the outer peripheral surface of the magnet 49 has been described. The second oil passage 65 may be formed by a hole different from the magnet hole 42A. Even with this configuration, by forming the hole through the inside of the rotor core 42 in the axial direction, discharge ports can be formed on both end faces in the axial direction of the rotor core 42, so that the case 20 can be formed from the opening of the second oil passage. Cooling oil can be discharged toward.

The configurations of the third oil passage 68 and the fourth oil passage 69 are not limited to those of the above embodiment. For example, the configuration shown in FIG. 6 may be adopted. The configuration shown in FIG. 6 is the same as that of the above embodiment except for the configuration of the fourth oil passage. Therefore, in the configuration shown in FIG. 6, the same configurations as those in the above embodiment are designated by common reference numerals and the description thereof will be omitted.

As shown in FIG. 6, the rotor core 90 is composed of a laminated body 91 in which a plurality of magnetic steel sheets which are magnetic materials are laminated, and a pair of end plates 92 arranged at both ends of the laminated body 91 in the stacking direction. There is. Of the electrical steel sheets constituting the laminated body 91, the fourth oil passage 93 is formed by four electrical steel sheets located closer to the end plate 92 than the connecting portion 66. The fourth oil passage 93 is provided so as to be inclined in the radial direction so as to be located on the outer peripheral side (upper side in FIG. 6) toward the end plate 92 side (left side in FIG. 6). The fourth discharge port 93A of the fourth oil passage 93 is open on the outer peripheral surface of the rotor core 90. The cross-sectional area of the flow path of the fourth oil passage 93 is smaller than the cross-sectional area of the flow path of the connecting portion 66 of the second oil passage 65.

As shown by the solid arrow in FIG. 7, in such a configuration, the cooling oil discharged from the discharge port 67A of the rotor core 90 is ejected toward the case 20.
Further, as shown by the arrow of the alternate long and short dash line in FIG. 7, the cooling oil discharged from the fourth discharge port 93A of the rotor core 90 is directed to the second end wall 23 side of the case 20 along the inclination of the fourth oil passage 93. It is ejected toward. Since the second sponge 28 is fixed to the second end wall 23, the cooling oil discharged from the discharge port 67A and the fourth discharge port 93A reaches the second sponge 28 and permeates the inside thereof. And be held. Therefore, in such a configuration, it is possible to increase the amount of cooling oil that reaches the second sponge 28 as compared with the above embodiment. Even with such a configuration, the same action and effect as in (1) above can be obtained. The fact that the discharge port and the porous body face each other means that the porous body is arranged in a direction perpendicular to the opening surface of the discharge port as in the above embodiment. In addition, as in the configuration shown in FIGS. 6 and 7, the case where the porous body is arranged in the discharge direction of the discharged cooling oil with respect to the opening surface of the discharge port is also included.

-In the above embodiment, at least one or two of the second oil passage 65, the third oil passage 68, and the fourth oil passage 69 may be omitted. When the second oil passage 65 is omitted, the first oil passage 64 may be directly connected to the third oil passage 68 or the fourth oil passage 69 instead of being connected to the magnet hole 42A. .. In such a configuration, the cooling oil discharged from the rotor core 42 is supplied to the stator 30 through the third discharge port 68A and the fourth discharge port 69A.

In the above embodiment, the third constituent hole 48A provided in the end plate 48 is arranged in the central portion of the inner region of the pair of inner side surfaces 42B in the 22nd constituent hole 46A of the second discharge magnetic steel sheet 46. , The end plate 48 and the second electrical steel sheet 46 are laminated to form a magnet hole 42A. Such a configuration can be changed as appropriate. For example, these may be laminated so that the third constituent hole 48A provided in the end plate 48 overlaps the inner region of the curved inner surface 42C in the 22nd constituent hole 46A of the second grain electrical steel sheet 46. Further, only the region where the second constituent hole 44A provided in the first discharged electromagnetic steel sheet 45 and the second discharged electromagnetic steel sheet 46 overlaps the inner region of the curved inner surface 42C of the first constituent hole 47A provided in the magnet-accommodating electrical steel sheet 47. May be formed in. In this case, the second component hole 44A may be provided in at least one of the regions overlapping the inner regions of the pair of curved inner surfaces 42C in the first discharge electrical steel sheet 45 and the second electrical steel sheet. Further, it is not always necessary to provide the magnet hole 42A in the rotor core 42.

-In the above embodiment, the end plate 48 can be omitted. In this case, among the electromagnetic steel sheets constituting the rotor core 42, the discharge port 67A is configured by the electromagnetic steel sheet located at the end in the axial direction.

-Although a resin sponge is exemplified as the porous body, a metal porous body can also be adopted. The porous material may have elasticity or may not have elasticity.

10 ... Electrical steel 20 ... Case 21 ... Circumferential wall 21A ... Drainage port 22 ... First end wall 23 ... Second end wall 24 ... First flange wall 25 ... Second flange wall 26 ... Connecting wall 27 ... First sponge 28 ... 2nd sponge 30 ... stator 31 ... stator core 31A ... yoke 31B ... teeth 31C ... slot 32 ... 3rd sponge 33 ... coil 40 ... rotor 41 ... rotor shaft 42 ... rotor core 42A ... magnet hole 42B ... inner surface 42C ... curved inner surface 43 ... Laminated body 44 ... Discharge side electromagnetic steel sheet 44A ... 2nd component hole 45 ... 1st discharge electromagnetic steel sheet 45A ... 21st component hole 46 ... 2nd discharge electromagnetic steel sheet 46A ... 22nd component hole 47 ... Magnet-accommodating electromagnetic steel sheet 47A ... 1st Constituent hole 48 ... End plate 48A ... 3rd constituent hole 49 ... Magnet 50 ... 1st bearing 51 ... 2nd bearing 61 ... Cooling oil passage 62 ... Main passage 63 ... Branch passage 64 ... 1st oil passage 64A ... Supply port 65 ... 2nd oil passage 66 ... Connection part 67 ... Discharge part 67A ... Discharge port 671A ... 1st discharge port 672A ... 2nd discharge port 68 ... 3rd oil passage 68A ... 3rd discharge port 69 ... 4th oil passage 69A ... 4th Discharge port 70 ... Radiator 75 ... Oil pan 80 ... Oil pump 90 ... Rotor core 91 ... Laminated body 92 ... End plate 93 ... 4th oil passage 93A ... 4th discharge port

Claims (1)

A rotary electric machine having a case, a stator housed in the case, and a rotor arranged on the inner peripheral side of the stator.
The rotor is provided with a cooling oil passage through which cooling oil flows.
The cooling oil passage includes a discharge port for discharging cooling oil from the rotor.
A rotary electric machine in which a porous body is arranged at a position facing the discharge port of the cooling oil passage in at least one of the case and the stator.

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