Electric motors and turbo-type fluid machinery

Abstract

To suppress reduction in the durability of a dynamic pressure sliding bearing.SOLUTION: A resin 60 is provided with a blocking member 65 for blocking a heat releasing material 66 from flowing out toward a second dynamic pressure sliding bearing 34 at least in the outer peripheral region beyond the second dynamic pressure sliding bearing 34. This blocks the heat releasing material 66 from flowing out toward the second dynamic pressure sliding bearing 34 by the blocking member 65, so that the intrusion of the heat releasing material 66 between a rotary shaft 18 and the second dynamic pressure sliding bearing 34 is suppressed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electric motor and a turbo-type fluid machine. [Background technology]

[0002] A turbo-type fluid machine including an electric motor and an impeller is known, for example, from Patent Document 1. The impeller is provided at least at one end of the rotating shaft of the electric motor. The impeller rotates integrally with the rotating shaft when driven by the electric motor.

[0003] An electric motor includes a rotating shaft, a rotor, a stator, and a housing. The rotor is fixed to the rotating shaft and rotates integrally with the rotating shaft. The stator is disposed on the outside of the rotor. The housing defines an accommodation space that accommodates the rotating shaft, rotor, and stator. The electric motor may also include a hydrodynamic plain bearing. The hydrodynamic plain bearing supports the rotating shaft so that it can rotate relative to the housing. In such electric motors, in order to improve the durability of the hydrodynamic plain bearing, a cooling flow path may be formed in the housing, through which a fluid flows that directly cools the hydrodynamic plain bearing. The accommodation space forms part of the cooling flow path.

[0004] The stator includes a cylindrical stator core and a coil wound around the stator core, the coil forming a coil end that protrudes from an end face of the stator core toward the housing.

[0005] Among such electric motors, a coil whose coil ends are molded with resin is known, as in Patent Document 2. The resin dissipates heat generated from the coil ends to the housing, improving the durability of the electric motor.

[0006] However, if a gap is formed between the resin and the housing, it becomes difficult for heat generated from the coil end to be transferred to the housing via the resin. Therefore, as in Patent Document 2, for example, an electric motor is known in which an expandable heat dissipation material is provided in the gap between the resin and the housing. This makes it easier for heat generated from the coil end to be dissipated to the housing via the resin and the heat dissipation material. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6968253 [Patent Document 2] Japanese Patent Application Publication No. 8-223866 Summary of the Invention [Problem to be solved by the invention]

[0008] However, because heat dissipation materials are made from elastic materials, they are more susceptible to deterioration over time than resins. As a result, foreign matter is more likely to be generated from the heat dissipation material due to deterioration over time. If foreign matter flows out toward the hydrodynamic plain bearing, for example, the foreign matter may find its way between the rotating shaft and the hydrodynamic plain bearing. If foreign matter gets between the rotating shaft and the hydrodynamic plain bearing, there is a risk that the durability of the hydrodynamic plain bearing will be reduced. [Means for solving the problem]

[0009] An electric motor that solves the above-mentioned problems comprises a rotating shaft, a rotor that is fixed to the rotating shaft and rotates integrally with the rotating shaft, a stator that is arranged on the outside of the rotor, a housing that defines an accommodation space that accommodates the rotating shaft, the rotor, and the stator, and a hydrodynamic plain bearing that rotatably supports the rotating shaft with respect to the housing, the accommodation space being formed within the housing and constituting part of a cooling flow path through which flows a fluid that directly cools the hydrodynamic plain bearing, the stator comprising a cylindrical stator core and coils that are wound around the stator core and form coil ends that protrude from an end face of the stator core towards the housing, the coil ends being molded with resin, an expandable heat dissipation material is provided in the gap between the resin and the housing, and a blocking member that prevents the heat dissipation material from flowing out towards the hydrodynamic plain bearing is provided on the housing or the resin, at least in an area outer than the hydrodynamic plain bearing.

[0010] According to this, the heat dissipation material flowing out toward the hydrodynamic sliding bearing is blocked by the blocking member, thereby preventing the heat dissipation material from entering between the rotating shaft and the hydrodynamic sliding bearing, and as a result, a decrease in the durability of the hydrodynamic sliding bearing can be prevented.

[0011] In the above electric motor, the blocking member may be annular and the rotating shaft may pass through it, and the resin may have an annular groove formed therein extending around the rotating shaft, and the blocking member may be attached to the groove.

[0012] According to this, the block member is attached to a groove formed in the resin, and therefore the block member can be stably provided in the resin, and as a result, the block member can effectively block the heat dissipation material that flows out toward the hydrodynamic sliding bearing.

[0013] In the above electric motor, the housing has a first housing component having an end wall and a peripheral wall extending cylindrically from the end wall, and a second housing component that closes an opening in the peripheral wall and, together with the first housing component, defines the accommodating space, the resin has a resin end portion that covers a portion of the coil end opposite to the end face of the stator core and extends in a ring shape around the rotating shaft, the end face of the resin end opposite to the coil end is formed with a ring-shaped protrusion that protrudes toward the second housing component and extends around the rotating shaft, the groove is formed on a tip surface of the protrusion, and the heat dissipation material is arranged on the outer periphery side of the blockage member attached to the groove and between the resin end portion and the second housing component.

[0014] This allows the blocking member to be attached to the groove formed in the tip surface of the convex portion, making it easy to arrange the blocking member between the resin and the second housing component.

[0015] A turbo-type fluid machine that solves the above problem comprises an electric motor according to any one of claims 1 to 3 and an impeller provided at at least one end of a rotating shaft of the electric motor, wherein the impeller rotates integrally with the rotating shaft by being driven by the electric motor.

[0016] This makes it possible to suppress a decrease in durability of the hydrodynamic plain bearing in a turbo-type fluid machine. [Effects of the Invention]

[0017] According to this invention, it is possible to suppress a decrease in the durability of the hydrodynamic sliding bearing. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view of a turbo-type fluid machine according to an embodiment. [Figure 2] 2 is an enlarged cross-sectional view showing a part of a turbo-type fluid machine. FIG. [Figure 3]FIG. 2 is an enlarged perspective view of a portion of the electric motor. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of an electric motor and a turbo-type fluid machine will be described below with reference to Figs. 1 to 3. The turbo-type fluid machine of this embodiment is a centrifugal compressor mounted on a fuel cell vehicle. The centrifugal compressor compresses air. The electric motor of this embodiment constitutes a part of the centrifugal compressor.

[0020] <Basic Configuration of Turbo-Type Fluid Machine 10> 1, the turbo-type fluid machine 10 includes an electric motor 11, a first impeller 12, and a second impeller 13. The turbo-type fluid machine 10 also includes a first compressor housing 14, a second compressor housing 15, a first plate 16, and a second plate 17. The first compressor housing 14, the second compressor housing 15, the first plate 16, and the second plate 17 are made of a metal material. The first compressor housing 14, the second compressor housing 15, the first plate 16, and the second plate 17 are made of aluminum, for example.

[0021] The electric motor 11 includes a rotating shaft 18, a rotor 19, a stator 20, and a housing 21. The housing 21 is cylindrical. The housing 21 is made of a metal material. For example, the housing 21 is made of aluminum.

[0022] The housing 21 has a first housing component 22 and a second housing component 23. The first housing component 22 has an end wall 22a and a peripheral wall 22b. The end wall 22a is, for example, disk-shaped. The peripheral wall 22b extends cylindrically from the end wall 22a. A cooling water passage 24 is formed in the peripheral wall 22b. The first housing component 22 is cooled by cooling water flowing through the cooling water passage 24.

[0023] The second housing component 23 is, for example, disk-shaped. The second housing component 23 closes the opening of the peripheral wall 22b. The second housing component 23, together with the first housing component 22, defines an accommodating space 25. Therefore, the housing 21 defines the accommodating space 25. The accommodating space 25 accommodates the rotating shaft 18, the rotor 19, and the stator 20.

[0024] The housing 21 has a first bearing retaining portion 26. The first bearing retaining portion 26 protrudes from the center of the end wall 22a of the first housing component 22 into the accommodation space 25. The first bearing retaining portion 26 is cylindrical. The axis of the first bearing retaining portion 26 coincides with the axis of the peripheral wall 22b. The inside of the first bearing retaining portion 26 penetrates the end wall 22a of the first housing component 22 and opens to the outer surface of the end wall 22a.

[0025] The housing 21 has a second bearing retaining portion 27. The second bearing retaining portion 27 protrudes from the center of the second housing component 23 into the accommodation space 25. The second bearing retaining portion 27 is cylindrical. The axis of the second bearing retaining portion 27 coincides with the axis of the peripheral wall 22b. Therefore, the axis of the first bearing retaining portion 26 and the axis of the second bearing retaining portion 27 coincide with each other. The inside of the second bearing retaining portion 27 penetrates the second housing component 23 and opens to the outer surface of the second housing component 23.

[0026] The rotating shaft 18 crosses the accommodation space 25 with the axis of the rotating shaft 18 and the axis of the peripheral wall 22b aligned. A first end, which is one axial end of the rotating shaft 18, passes from the accommodation space 25 through the inside of the second bearing holder 27 and protrudes to the outside of the housing 21. A second end, which is the other axial end of the rotating shaft 18, passes from the accommodation space 25 through the inside of the first bearing holder 26 and protrudes to the outside of the housing 21.

[0027] The rotor 19 is fixed to the rotary shaft 18. The rotor 19 has a cylindrical rotor core 28 fixed to the rotary shaft 18 and a plurality of permanent magnets (not shown) provided in the rotor core 28. The rotor 19 rotates integrally with the rotary shaft 18.

[0028] The stator 20 is fixed to the housing 21. The stator 20 is disposed on the outside of the rotor 19. The stator 20 has a cylindrical stator core 29 and a coil 30.

[0029] The stator core 29 is fixed to the inner circumferential surface of the circumferential wall 22b of the first housing component 22. The stator core 29 has a first end face 29a and a second end face 29b. The first end face 29a is an end face located on one side of the stator core 29 in the axial direction. The second end face is an end face located on the other side of the stator core 29 in the axial direction. The stator core 29 is disposed in the accommodating space 25 with the first end face 29a facing the end wall 22a of the first housing component 22 in the axial direction and the second end face 29b facing the second housing component 23 in the axial direction.

[0030] The coil 30 is wound around the stator core 29. The coil 30 includes a first coil end 31 and a second coil end 32. The first coil end 31 protrudes from a first end face 29a of the stator core 29 toward the end wall 22a of the first housing component 22. The second coil end 32 protrudes from a second end face 29b of the stator core 29 toward the second housing component 23. Therefore, the second coil end 32 is a coil end that protrudes from the end face of the stator core 29 toward the second housing component 23. Therefore, the coil 30 forms a coil end that protrudes from the end face of the stator core 29 toward the housing 21. When a current flows through the coil 30 from a battery (not shown), the rotating shaft 18 rotates integrally with the rotor 19.

[0031] The electric motor 11 is equipped with a first dynamic pressure plain bearing 33 and a second dynamic pressure plain bearing 34. The first dynamic pressure plain bearing 33 is cylindrical. The first dynamic pressure plain bearing 33 is held by the first bearing holder 26. The first dynamic pressure plain bearing 33 supports the rotating shaft 18 rotatably relative to the first housing component 22.

[0032] The second dynamic pressure plain bearing 34 is cylindrical. The second dynamic pressure plain bearing 34 is held by the second bearing holder 27. The second dynamic pressure plain bearing 34 supports the rotating shaft 18 rotatably relative to the second housing component 23. Therefore, the first dynamic pressure plain bearing 33 and the second dynamic pressure plain bearing 34 are dynamic pressure plain bearings that support the rotating shaft 18 rotatably relative to the housing 21.

[0033] The first plate 16 is connected to the outer surface of the end wall 22a of the first housing component 22. The first plate 16 is attached to the end wall 22a of the first housing component 22 with the thickness direction of the first plate 16 coinciding with the thickness direction of the end wall 22a of the first housing component 22.

[0034] A first insertion hole 16h is formed in the first plate 16. The first insertion hole 16h penetrates the center of the first plate 16. The first insertion hole 16h communicates with the inside of the first bearing holder 26. The axis of the first insertion hole 16h coincides with the axis of the first bearing holder 26.

[0035] The second plate 17 is connected to the outer surface of the second housing component 23. The second plate 17 is attached to the second housing component 23 in a state where the thickness direction of the second plate 17 coincides with the thickness direction of the second housing component 23.

[0036] A second insertion hole 17h is formed in the second plate 17. The second insertion hole 17h penetrates the center of the second plate 17. The second insertion hole 17h communicates with the inside of the second bearing holder 27. The axis of the second insertion hole 17h coincides with the axis of the second bearing holder 27.

[0037] The first compressor housing 14 is cylindrical and has a circular first intake port 35 through which air is drawn. The first compressor housing 14 is connected to the end face of the second plate 17 opposite to the second housing component 23, with the axis of the first intake port 35 coinciding with the axis of the second insertion hole 17h. The first intake port 35 opens to the end face of the first compressor housing 14 opposite to the second plate 17. Air that has been purified by an air cleaner (not shown) flows through the first intake port 35.

[0038] The turbo-type fluid machine 10 includes a first impeller chamber 36, a first discharge chamber 37, and a first diffuser passage 38. The first impeller chamber 36, the first discharge chamber 37, and the first diffuser passage 38 are formed between the first compressor housing 14 and the second plate 17. The first impeller chamber 36 communicates with the first suction port 35. The first discharge chamber 37 extends around the axis of the first suction port 35 around the periphery of the first impeller chamber 36. The first diffuser passage 38 communicates between the first impeller chamber 36 and the first discharge chamber 37. The first impeller chamber 36 communicates with the second insertion hole 17h.

[0039] The turbo-type fluid machine 10 has a first discharge passage 39. The first discharge passage 39 is formed in the first compressor housing 14. A first end of the first discharge passage 39 communicates with the first discharge chamber 37. A second end of the first discharge passage 39 opens to the outer peripheral surface of the first compressor housing 14.

[0040] The second compressor housing 15 is cylindrical and has a circular second intake port 40 through which air is drawn. The second compressor housing 15 is connected to the end face of the first plate 16 opposite to the first housing component 22, with the axis of the second intake port 40 coinciding with the axis of the first insertion hole 16h. The second intake port 40 opens at the end face of the second compressor housing 15 opposite to the first plate 16.

[0041] The turbo-type fluid machine 10 includes a second impeller chamber 41, a second discharge chamber 42, and a second diffuser passage 43. The second impeller chamber 41, the second discharge chamber 42, and the second diffuser passage 43 are formed between the second compressor housing 15 and the first plate 16. The second impeller chamber 41 communicates with the second suction port 40. The second discharge chamber 42 extends around the axis of the second suction port 40 around the periphery of the second impeller chamber 41. The second diffuser passage 43 communicates between the second impeller chamber 41 and the second discharge chamber 42. The second impeller chamber 41 communicates with the first insertion hole 16h.

[0042] The turbo-type fluid machine 10 has a second discharge passage 44. The second discharge passage 44 is formed in the second compressor housing 15. A first end of the second discharge passage 44 communicates with the second discharge chamber 42. A second end of the second discharge passage 44 opens to the outer peripheral surface of the second compressor housing 15.

[0043] A supply pipe 45 is connected to the second discharge passage 44. The supply pipe 45 is connected to a fuel cell stack 46. A first end of the supply pipe 45 is connected to the second discharge passage 44. A second end of the supply pipe 45 is connected to the fuel cell stack 46.

[0044] The turbo fluid machine 10 includes a connecting pipe 47. A first end of the connecting pipe 47 communicates with the first discharge passage 39. A second end of the connecting pipe 47 communicates with the second suction port 40. Air discharged from the first discharge chamber 37 to the first discharge passage 39 flows through the connecting pipe 47. The air that has passed through the connecting pipe 47 is then drawn into the second impeller chamber 41 via the second suction port 40.

[0045] The first impeller 12 is connected to a first end of the rotary shaft 18. The first impeller 12 is housed in a first impeller chamber 36. Therefore, the first impeller chamber 36 houses the first impeller 12. The first impeller 12 rotates integrally with the rotary shaft 18, thereby compressing the air drawn into the first impeller chamber 36.

[0046] The second impeller 13 is connected to a second end of the rotary shaft 18. The second impeller 13 is housed in the second impeller chamber 41. Therefore, the second impeller chamber 41 houses the second impeller 13. The second impeller 13 rotates integrally with the rotary shaft 18, thereby compressing the air drawn into the second impeller chamber 41. The second impeller 13 compresses the air that has been compressed by the first impeller 12.

[0047] In this way, the first impeller 12 and the second impeller 13 are impellers provided on at least one end of the rotary shaft 18 of the electric motor 11. The first impeller 12 and the second impeller 13 rotate integrally with the rotary shaft 18 when driven by the electric motor 11.

[0048] The turbo fluid machine 10 includes a first seal member 48. The first seal member 48 is provided between the first insertion hole 16h and the rotating shaft 18. The first seal member 48 suppresses air leakage from the second impeller chamber 41 toward the inside of the first bearing holder 26 into the accommodation space 25. The first seal member 48 is, for example, a seal ring.

[0049] The turbo fluid machine 10 includes a second seal member 49. The second seal member 49 is provided between the second insertion hole 17h and the rotating shaft 18. The second seal member 49 prevents air from leaking from the first impeller chamber 36 toward the inside of the second bearing holder 27 into the accommodation space 25. The second seal member 49 is, for example, a seal ring.

[0050] Air drawn into the first impeller chamber 36 through the first intake port 35 is accelerated by the rotation of the first impeller 12 and sent into the first diffuser passage 38. The air is pressurized as it passes through the first diffuser passage 38. The air that has passed through the first diffuser passage 38 is then discharged into the first discharge chamber 37. The air discharged into the first discharge chamber 37 is then discharged into the first discharge passage 39. The air discharged into the first discharge passage 39 is then drawn into the second impeller chamber 41 through the connecting pipe 47 and the second intake port 40. The air drawn into the second impeller chamber 41 is accelerated by the rotation of the second impeller 13 and sent into the second diffuser passage 43. The air is pressurized as it passes through the second diffuser passage 43. The air that has passed through the second diffuser passage 43 is then discharged into the second discharge chamber 42. The air discharged into the second discharge chamber 42 is then discharged into the second discharge passage 44. The air discharged into the second discharge passage 44 is supplied to the fuel cell stack 46 via the supply pipe 45. Therefore, the turbo fluid machine 10 supplies air to the fuel cell stack 46. The oxygen contained in the air supplied to the fuel cell stack 46 contributes to the power generation of the fuel cell stack 46.

[0051] The turbo fluid machine 10 includes an introduction passage 50. The introduction passage 50 is formed in the second plate 17. A first end of the introduction passage 50 opens to the outer peripheral surface of the second plate 17. A second end of the introduction passage 50 communicates with the second insertion hole 17h at a position closer to the accommodation space 25 than the second seal member 49.

[0052] The turbo fluid machine 10 includes a discharge passage 51. The discharge passage 51 is formed in the first plate 16. A first end of the discharge passage 51 communicates with the first insertion hole 16h at a position closer to the interior of the accommodation space 25 than the first seal member 48. A second end of the discharge passage 51 opens to the outer circumferential surface of the first plate 16.

[0053] A branch pipe 52 is connected to a first end of the introduction passage 50. The branch pipe 52 branches off from the supply pipe 45. A first end of the branch pipe 52 is connected to the supply pipe 45. A second end of the branch pipe 52 is connected to the first end of the introduction passage 50. An intercooler 53 is provided in the branch pipe 52. The intercooler 53 cools the air flowing through the branch pipe 52.

[0054] Some of the air flowing through the supply pipe 45 flows into the branch pipe 52. The air flowing through the branch pipe 52 is cooled by the intercooler 53. As a result, the air that has passed through the intercooler 53 has a lower temperature than the air discharged into the second discharge chamber 42. The air cooled by the intercooler 53 then passes through the introduction passage 50, the second insertion hole 17h, and the inside of the second bearing holder 27, and is introduced into the accommodation space 25. The second hydrodynamic plain bearing 34 is cooled by the air passing inside the second bearing holder 27.

[0055] The air introduced into the accommodation space 25 passes between the stator 20 and the rotor 19, and flows inside the first bearing holder 26. The first hydrodynamic plain bearing 33 is cooled by the air passing inside the first bearing holder 26. The air that has passed inside the first bearing holder 26 is then discharged to the outside via the first insertion hole 16h and the discharge passage 51.

[0056] Therefore, the inside of the first bearing retaining portion 26, the accommodation space 25, and the inside of the second bearing retaining portion 27 are formed inside the housing 21 and each constitute a cooling flow path 54 through which air flows as a fluid that directly cools the first hydrodynamic plain bearing 33 and the second hydrodynamic plain bearing. Therefore, the accommodation space 25 constitutes part of the cooling flow path 54.

[0057] <Resin member 60> Resin 60 is provided inside the housing 21. Resin 60 covers the first coil end 31 and the second coil end 32. Therefore, the first coil end 31 and the second coil end 32 of the coil 30 are molded with resin 60. Resin 60 is thermally bonded to the housing 21. Resin 60 has a first resin portion 61 that covers the first coil end 31 and a second resin portion 62 that covers the second coil end 32.

[0058] The first resin portion 61 has a first resin outer peripheral portion 61a, a first resin inner peripheral portion 61b, and a first resin end portion 61c. The first resin outer peripheral portion 61a is cylindrical and covers the outside of the first coil end 31. The first resin outer peripheral portion 61a contacts the inner peripheral surface of the peripheral wall 22b of the first housing component 22. Therefore, the first resin outer peripheral portion 61a is thermally bonded to the peripheral wall 22b of the first housing component 22. The first resin inner peripheral portion 61b is cylindrical and covers the inside of the first coil end 31. The first resin end portion 61c is annular and covers a portion of the first coil end 31 opposite to the first end face 29a of the stator core 29. The first resin end portion 61c extends annularly around the rotating shaft 18. The first resin end portion 61c connects the first resin outer peripheral portion 61a and the first resin inner peripheral portion 61b. The first resin end portion 61c is in contact with the inner surface of the end wall 22a of the first housing component 22. Therefore, the first resin end portion 61c is thermally coupled to the end wall 22a of the first housing component 22. In this manner, the first resin portion 61 is thermally coupled to the first housing component 22.

[0059] The second resin portion 62 has a second resin outer peripheral portion 62a, a second resin inner peripheral portion 62b, and a second resin end portion 62c. The second resin outer peripheral portion 62a is cylindrical and covers the outside of the second coil end 32. The second resin outer peripheral portion 62a is in contact with the inner peripheral surface of the peripheral wall 22b of the first housing component 22. Therefore, the second resin outer peripheral portion 62a is thermally bonded to the peripheral wall 22b of the first housing component 22. The second resin inner peripheral portion 62b is cylindrical and covers the inside of the second coil end 32.

[0060] The second resin end portion 62c is annular and covers a portion of the second coil end 32 opposite the second end face 29b of the stator core 29. Therefore, the second resin end portion 62c is a resin end portion that covers a portion of the second coil end 32 opposite the second end face 29b of the stator core 29. The second resin end portion 62c extends in an annular shape around the rotating shaft 18. The second resin end portion 62c connects the second resin outer peripheral portion 62a and the second resin inner peripheral portion 62b. The first resin end portion 61c is spaced apart from the inner surface of the second housing component 23.

[0061] <Protrusion 63> 2 and 3, the second resin end portion 62c has an annular protrusion 63. The protrusion 63 is formed on an end surface 62e of the second resin end portion 62c opposite to the second coil end 32. The protrusion 63 protrudes toward the second housing component 23. The protrusion 63 extends around the rotating shaft 18. A tip surface 63a of the protrusion 63 is spaced from the inner surface of the second housing component 23.

[0062] <Groove 64 and blocking member 65> An annular groove 64 is formed in the tip surface 63a of the convex portion 63. Therefore, the groove 64 is formed in the resin 60. The groove 64 extends around the rotating shaft 18. The tip surface 63a of the convex portion 63 has a first tip surface 631a that is a portion on the outer periphery of the groove 64, and a second tip surface 632a that is a portion on the inner periphery of the groove 64. A block member 65 is provided in the gap between the second resin end portion 62c and the second housing component 23. Therefore, the block member 65 is provided in the gap between the resin 60 and the housing 21. The block member 65 is annular, through which the rotating shaft 18 passes. The block member 65 is attached to the groove 64. The block member 65 is in close contact with the inner surface of the second housing component 23 and the bottom surface of the groove 64. The block member 65 is provided in the resin 60 at least in an area outer than the second hydrodynamic sliding bearing 34.

[0063] <Heat dissipation material 66> The electric motor 11 includes a heat dissipation material 66. The heat dissipation material 66 is disposed on the outer circumferential side of the blocking member 65 attached to the groove 64, and between the second resin end portion 62c and the second housing component 23. The heat dissipation material 66 is in close contact with the end face 62e of the second resin end portion 62c. A portion of the heat dissipation material 66 is in close contact with the first tip face 631a of the protrusion 63 and the blocking member 65. The heat dissipation material 66 is in close contact with the inner surface of the second housing component 23. The heat dissipation material 66 fills the gap between the resin 60 and the second housing component 23. The second resin end portion 62c is thermally coupled to the second housing component 23 via the heat dissipation material 66. In this manner, the resin 60 is thermally coupled to the housing 21.

[0064] The heat dissipation material 66 is flexible. The heat dissipation material 66 is, for example, a rubber material, a gel-like material, a clay-like material, or a material in which a filler with excellent heat dissipation properties is embedded in an elastic material such as a sponge. The heat dissipation material 66 is a material that has thermal conductivity.

[0065] [Operation of the embodiment] Next, the operation of the embodiment will be described. Heat generated from the first coil end 31 is dissipated to the first housing component 22 via the first resin portion 61. Heat generated from the second coil end 32 is dissipated to the first housing component 22 via the second resin portion 62. Furthermore, heat generated from the second coil end 32 is also dissipated to the second housing component 23 via the second resin end portion 62c and the heat dissipation material 66. In this way, heat generated from the first coil end 31 and the second coil end 32 is dissipated to the housing 21 via the resin 60. As a result, the durability of the electric motor 11 is improved.

[0066] Incidentally, in a configuration in which resin 60 is provided inside the housing 21, it is necessary to design the second housing component 23 so that it does not interfere with the resin 60 when assembling the second housing component 23 to the peripheral wall 22b of the first housing component 22. In this case, in the electric motor 11, an expandable heat dissipation material 66 is provided in the gap between the resin 60 and the second housing component 23. Therefore, heat generated from the second coil end 32 is easily dissipated to the second housing component 23 via the resin 60 and the heat dissipation material 66.

[0067] Because the heat dissipation material 66 is made from an elastic material, it is more susceptible to deterioration over time than the resin 60. Therefore, foreign matter is more likely to be generated from the heat dissipation material 66 due to deterioration over time. At this time, a block member 65 is provided in the resin 60, at least in an area more outer than the second hydrodynamic plain bearing 34. This prevents foreign matter and the like generated from the heat dissipation material 66 from flowing out toward the second hydrodynamic plain bearing 34. Therefore, the block member 65 blocks the heat dissipation material 66 from flowing out toward the second hydrodynamic plain bearing 34. This prevents part of the heat dissipation material 66 from entering between the rotating shaft 18 and the second hydrodynamic plain bearing 34.

[0068] [Effects of the embodiment] The embodiment can provide the following effects. (1) At least in an area more outer than the second hydrodynamic plain bearing 34, the resin 60 is provided with a blocking member 65 that blocks the heat dissipation material 66 from flowing out toward the second hydrodynamic plain bearing 34. By doing so, the blocking member 65 blocks the heat dissipation material 66 flowing out toward the second hydrodynamic plain bearing 34, thereby preventing the heat dissipation material 66 from entering between the rotating shaft 18 and the second hydrodynamic plain bearing 34. As a result, a decrease in the durability of the second hydrodynamic plain bearing 34 can be prevented.

[0069] (2) Because the blockage member 65 is attached to the groove 64 formed in the resin 60, the blockage member 65 can be stably provided in the resin 60. As a result, the blockage member 65 can effectively block the heat dissipation material 66 that flows out toward the second hydrodynamic plain bearing 34.

[0070] (3) A groove 64 is formed in the tip surface 63a of the protrusion 63. This allows the blocking member 65 to be attached to the groove 64 formed in the tip surface 63a of the protrusion 63. Therefore, the blocking member 65 can be easily disposed between the second resin end portion 62c and the second housing component 23.

[0071] (4) According to the turbo fluid machine 10 having the above-described configuration, the deterioration of the durability of the second hydrodynamic bearing 34 can be suppressed. [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0072] In the embodiment, the blockage member 65 may not be attached to the groove 64 formed in the resin 60, but may be attached to a groove formed on the inner surface of the second housing component 23, for example. In this way, the blockage member 65 may be provided on the housing 21. The key is that the blockage member 65 needs to be provided on the housing 21 or the resin 60, at least in an area more outer than the second hydrodynamic sliding bearing 34.

[0073] In the embodiment, the protrusion 63 does not have to be formed on the end surface 62e of the second resin end portion 62c. For example, an annular protrusion that protrudes toward the second resin end portion 62c and extends around the rotation shaft 18 may be formed on the inner surface of the second housing component 23. In this case, a groove 64 into which a blocking member 65 is attached is formed on the tip surface of the protrusion. The heat dissipation material 66 is located on the outer circumferential side of the blocking member 65 attached to the groove 64, and is disposed between the second resin end portion 62c and the second housing component 23.

[0074] In the embodiment, for example, an annular groove 64 extending around the rotation shaft 18 may be formed in the inner circumferential surface of the second resin inner circumferential portion 62b. A block member 65 may be attached to the groove 64. The block member 65 blocks the heat dissipation material 66 attempting to flow toward the second hydrodynamic plain bearing 34 via the gap between the inner circumferential surface of the second resin inner circumferential portion 62b and the outer circumferential surface of the second bearing holder 27. This makes it possible to block the heat dissipation material 66 flowing toward the second hydrodynamic plain bearing 34 by the block member 65. The key is to provide the block member 65 in the housing 21 or the resin 60 in at least an area outer than the second hydrodynamic plain bearing 34, so that the block member 65 blocks the heat dissipation material 66 from flowing toward the second hydrodynamic plain bearing 34.

[0075] In the above-described embodiment, the turbo fluid machine 10 may not include the second impeller 13 . In the above-described embodiment, the turbo fluid machine 10 may be configured to include a turbine wheel, which is an impeller, instead of the second impeller 13 .

[0076] In the embodiment, the turbo-type fluid machine 10 may be configured to include a turbine wheel without including the first impeller 12 and the second impeller 13. In other words, the turbo-type fluid machine 10 may be an expander instead of a centrifugal compressor. In other words, the turbo-type fluid machine 10 may be configured such that an impeller is provided on at least one end of the rotating shaft 18 of the electric motor 11.

[0077] In the above-described embodiment, the turbo fluid machine 10 does not necessarily have to be mounted on a fuel cell vehicle. In other words, the turbo fluid machine 10 is not limited to being mounted on a vehicle. [Explanation of symbols]

[0078] 10...turbo-type fluid machine, 11...electric motor, 12...first impeller which is an impeller, 13...second impeller which is an impeller, 18...rotating shaft, 19...rotor, 20...stator, 21...housing, 22...first housing component, 22a...end wall, 22b...circumferential wall, 23...second housing component, 25...accommodation space, 29...stator core, 30...coil, 32...second coil end which is a coil end, 33...first hydrodynamic pressure plain bearing which is a hydrodynamic pressure plain bearing, 34...second hydrodynamic pressure plain bearing which is a hydrodynamic pressure plain bearing, 54...cooling flow path, 60...resin, 62c...second resin end which is a resin end, 62e...end surface, 63...convex portion, 63a...tip surface, 64...groove, 65...blocking member, 66...heat dissipation material.

Claims

1. A rotation axis; a rotor fixed to the rotary shaft and rotating integrally with the rotary shaft; a stator disposed outside the rotor; a housing defining an accommodation space for accommodating the rotating shaft, the rotor, and the stator; a hydrodynamic sliding bearing that rotatably supports the rotating shaft relative to the housing, the accommodating space constitutes a part of a cooling flow path that is formed within the housing and through which a fluid that directly cools the hydrodynamic sliding bearing flows, The stator includes: A cylindrical stator core; a coil wound around the stator core, the coil end protruding from an end surface of the stator core toward the housing, the coil end being molded with resin; an electric motor in which a flexible heat dissipation material is provided in a gap between the resin and the housing, an electric motor, characterized in that a blocking member that blocks the heat dissipation material from flowing out toward the hydrodynamic sliding bearing is provided in the housing or the resin at least in an area outer than the hydrodynamic sliding bearing.

2. the blocking member is annular and the rotation shaft passes through it, an annular groove extending around the rotation shaft is formed in the resin; 2. The electric motor according to claim 1, wherein the blocking member is attached to the groove.

3. The housing includes: a first housing member having an end wall and a peripheral wall extending cylindrically from the end wall; a second housing member that closes the opening of the peripheral wall and defines the accommodation space together with the first housing member, the resin covers a portion of the coil end opposite to the end face of the stator core and has a resin end portion extending annularly around the rotation shaft, an annular protrusion is formed on an end surface of the resin end portion opposite to the coil end, the protrusion protruding toward the second housing component and extending around the rotation shaft; The groove is formed on the tip surface of the protrusion, 3. The electric motor according to claim 2, wherein the heat dissipation material is disposed on the outer circumferential side of the blocking member attached to the groove and between the resin end portion and the second housing component.

4. The electric motor according to any one of claims 1 to 3, an impeller provided at at least one end of the rotary shaft of the electric motor; The impeller is a turbo-type fluid machine that rotates integrally with the rotary shaft by being driven by the electric motor.

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