Pump

Abstract

The pump includes: a rotor; a stator; a pump part connected to one side of the rotor in the axial direction; a housing having a rotor housing part in which the rotor is housed; a substrate housed inside the case; and a plurality of electronic components mounted on the substrate. The housing is provided with: a substrate accommodating part which is located on the other side of the rotor accommodating part in the axial direction and accommodates the substrate therein; and a partition portion that partitions the inside of the rotor housing portion from the inside of the substrate housing portion. The partition portion has a first partition wall and a second partition wall that partition the interior of the rotor housing portion and the interior of the substrate housing portion in the axial direction. The second partition wall is located on one side of the first partition wall in the axial direction. The plurality of electronic components include a first electronic component and a second electronic component having an axial dimension larger than that of the first electronic component, the second electronic component being mounted on a surface on one side of the substrate in the axial direction. The second electronic component overlaps the second partition wall when viewed in the axial direction. A heat conducting member is provided between the partition and the substrate, the heat conducting member being in contact with the partition and the substrate.

Description

Technical Field

[0001] The invention relates to a pump. Background Art

[0002] Conventionally, there is known an electric pump having a structure that releases heat of a substrate from a cover to the outside air via a potting material (for example, Patent Document 1). Prior art literature Patent Literature

[0003] Patent Document 1: International Publication No. 2012 / 042971 Summary of the invention

[0004] The electric pump described above has a problem in that it is difficult to improve heat dissipation because it is structured to release the heat of the substrate into the air having a low thermal conductivity.

[0005] The present invention has been made in view of the above circumstances, and one object of the present invention is to provide a pump having a structure capable of improving the heat dissipation performance of a substrate.

[0006] One mode of the pump of the present invention comprises: a rotor that can rotate around a central axis; a stator that is radially opposite to the rotor with a gap therebetween; a pump unit that is connected to one axial side of the rotor; a housing that has a rotor housing that houses the rotor; a substrate that is housed inside the housing; and a plurality of electronic components that are mounted on the substrate. The housing comprises: a substrate housing that is located on the other axial side of the rotor housing and houses the substrate; and a partition that separates the interior of the rotor housing from the interior of the substrate housing. The partition comprises a first partition wall and a second partition wall that separate the interior of the rotor housing from the interior of the substrate housing in the axial direction. The second partition wall is located at a position closer to one axial side than the first partition wall. The plurality of electronic components include a first electronic component and a second electronic component, the axial dimension of the second electronic component being larger than the axial dimension of the first electronic component, and the second electronic component being mounted on a surface on one axial side of the substrate. The second electronic component overlaps the second partition wall when viewed in the axial direction. A heat conducting member in contact with the partition and the substrate is provided between the partition and the substrate.

[0007] According to one aspect of the present invention, in the pump, the heat dissipation performance of the substrate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view showing the pump according to the first embodiment. Figure 2 is a cross-sectional view showing the pump of the first embodiment. Figure 3Sectional view II-II in FIG. Figure 3 It is a cross-sectional view showing the pump according to the first embodiment. Figure 4 It is a perspective view showing a part of the bearing portion according to the first embodiment. Figure 5 This is a cross-sectional view showing a part of the pump according to the first embodiment. Figure 6 It is a perspective view showing a part of the housing according to the first embodiment. Figure 7 is a cross-sectional view showing a portion of the pump according to the first embodiment. Figure 2 A partial enlarged view of . Figure 8 It is a perspective view showing the partition part of the first embodiment. Fig. 9 It is a perspective view showing a partition portion according to the second embodiment. DETAILED DESCRIPTION

[0009] In each figure, the central axis J of the pump of the embodiment described below is hypothetically shown. In the following description, the axial direction of the central axis J is simply referred to as "axial direction", the radial direction centered on the central axis J is simply referred to as "radial direction", and the circumferential direction centered on the central axis J is simply referred to as "circumferential direction". The Z axis shown in each figure shows the direction in which the central axis J extends. In the following description, the side (+Z side) to which the arrow of the Z axis in the axial direction points is referred to as the "upper side", and the side opposite to the side (-Z side) to which the arrow of the Z axis in the axial direction points is referred to as the "lower side".

[0010] In the following embodiments, the lower side corresponds to "one side in the axial direction", and the upper side corresponds to "the other side in the axial direction". In addition, the upper side and the lower side are names used only to describe the relative positional relationship of each part, and the actual configuration relationship may be a configuration relationship other than the configuration relationship indicated by these names. Figure 2 In FIG. 1 , for convenience of explanation, cross sections at different circumferential positions on both sides of the center axis J are shown.

[0011] <First embodiment> Figure 1 and Figure 2 The pump 100 of the present embodiment shown is a water pump that delivers water W. Figure 2 As shown, the pump 100 of this embodiment includes a rotor 10, a stator 20, a fixed shaft 30, a pump unit 40, a housing 50, a holding member 80, a conductive member 90, a substrate 95, and a plurality of electronic components 96. The housing 50 includes a first housing 60, a second housing 70, and a cover member 51 made of resin.

[0012] The rotor 10 is rotatable about a central axis J. The rotor 10 includes a rotor core 11, a magnet 12, a first resin portion 13, a second resin portion 14, and a bearing portion 15. Figure 3 As shown, the rotor core 11 is in a ring shape surrounding the central axis J. The magnet 12 is fixed to the radially outer surface of the rotor core 11. A plurality of magnets 12 are provided at intervals in the circumferential direction. In the present embodiment, eight magnets 12 are provided.

[0013] The first resin portion 13 is substantially cylindrical and surrounds the central axis J and extends in the axial direction. Figure 2 As shown, the first resin portion 13 covers the rotor core 11 and the plurality of magnets 12 from the radially outer side and the axially opposite sides. The rotor core 11 and the plurality of magnets 12 are embedded in the first resin portion 13. In the present embodiment, the first resin portion 13 is manufactured by insert molding in which the rotor core 11 and the plurality of magnets 12 are embedded components.

[0014] The second resin portion 14 is in a generally cylindrical shape that surrounds the center axis J and extends axially. The second resin portion 14 is located radially inside the rotor core 11. The second resin portion 14 covers the radially inside surface of the rotor core 11. The second resin portion 14 has a portion that clamps the first resin portion 13 in the axial direction. The second resin portion 14 is fixed to the first resin portion 13. In the present embodiment, the second resin portion 14 is manufactured by insert molding, wherein the insert molding uses a molded body consisting of the rotor core 11, a plurality of magnets 12, and the first resin portion 13 that are integrally molded by insert molding, and a bearing portion 15 as an embedded component.

[0015] The bearing portion 15 is in the shape of a cylinder through which the fixed shaft 30 passes in the axial direction. In the present embodiment, the bearing portion 15 is in the shape of a substantially cylindrical cylinder that surrounds the central axis J and extends in the axial direction. The bearing portion 15 is a portion that is supported by the fixed shaft 30 so as to be rotatable. The bearing portion 15 is located radially inside the second resin portion 14. The outer peripheral surface of the bearing portion 15 is fixed to the inner peripheral surface of the second resin portion 14. The bearing portion 15 is made of resin, for example. The bearing portion 15 is open on both sides of the axial direction. As Figure 4 As shown, a step portion 15d is provided on the inner circumferential surface of the lower end of the bearing portion 15, and the step portion 15d has a step surface 15e facing downward. The step surface 15e is in a substantially annular shape surrounding the central axis J. The step surface 15e is, for example, orthogonal to the axial direction. The inner diameter of the portion of the bearing portion 15 located below the step surface 15e is larger than the inner diameter of the portion of the bearing portion 15 provided with the step surface 15e.

[0016] like Figure 5As shown, the inner peripheral surface of the upper end of the bearing portion 15 is an inclined surface 15f. The inclined surface 15f is annular and surrounds the central axis J, and its inner diameter increases upward. The inclined surface 15f is the same shape as the outer peripheral surface of a truncated cone whose outer diameter increases upward.

[0017] The inner surface of the bearing portion 15 is provided with a first groove portion 15a which is open on both sides in the axial direction. The first groove portion 15a extends in the axial direction. More specifically, the first groove portion 15a extends from the lower end of the inclined surface 15f to the stepped surface 15e. The upper end of the first groove portion 15a opens at the inclined surface 15f. The lower end of the first groove portion 15a opens at the stepped surface 15e. Figure 4 As shown, in a cross section orthogonal to the axial direction, the inner surface of the first groove portion 15a is in a semicircular arc shape that is recessed radially outward. A plurality of first groove portions 15a are provided at intervals in the circumferential direction. In the present embodiment, four first groove portions 15a are provided. In the present embodiment, a plurality of first groove portions 15a are arranged at equal intervals in a circumferential direction.

[0018] On the lower end surface of the bearing portion 15, a second groove portion 15b extending from the inner circumferential surface of the bearing portion 15 to the outer circumferential surface of the bearing portion 15 is provided. In the present embodiment, the second groove portion 15b extends in a straight line in the radial direction. A plurality of second groove portions 15b are provided at intervals in the circumferential direction. In the present embodiment, four second groove portions 15b are provided. In the present embodiment, a plurality of second groove portions 15b are arranged at equal intervals on a circumferential circle. The interior of the second groove portion 15b is directly or indirectly connected to the interior of the first groove portion 15a. In the present embodiment, the interior of the second groove portion 15b is indirectly connected to the interior of the first groove portion 15a via a portion of the internal space of the bearing portion 15 that is lower than the step surface 15e. In more detail, the radially inner end of the interior of the second groove portion 15b is indirectly connected to the lower end of the interior of the first groove portion 15a via a portion of the internal space of the bearing portion 15 that is lower than the step surface 15e. Alternatively, the interior of the second groove portion 15b may be directly connected to the interior of the first groove portion 15a.

[0019] like Figure 5 As shown, the third groove 15c extending from the inner circumference of the bearing 15 to the outer circumference of the bearing 15 is provided on the upper end surface of the bearing 15. The third groove 15c is the same as the second groove 15b except that it is provided on the upper end surface of the bearing 15.

[0020] like Figure 2As shown, the stator 20 is opposite to the rotor 10 in the radial direction with a gap therebetween. More specifically, the stator 20 is opposite to the rotor 10 in the radial direction with a portion of the resin constituting the first housing 60 and the gap therebetween. In the present embodiment, the stator 20 is located radially outside the rotor 10. The stator 20 surrounds the rotor 10. At least a portion of the stator 20 is embedded in and held in the first housing 60. In the present embodiment, the stator 20 is entirely embedded in the first housing 60. The stator 20 includes a stator core 21, an insulator 22 mounted on the stator core 21, and a plurality of coils 23 mounted on the stator core 21 via the insulator 22.

[0021] The stator core 21 is located radially outside the rotor core 11 and the plurality of magnets 12, and surrounds the rotor core 11 and the plurality of magnets 12. The stator core 21 is formed, for example, by stacking a plurality of plate members in the axial direction. The plurality of plate members forming the stator core 21 are, for example, electromagnetic steel plates. At least a portion of the stator core 21 is embedded in and held in a first resin housing 60. In the present embodiment, the stator core 21 is entirely embedded in the first housing 60. Figure 3 As shown, the stator core 21 includes: an annular core back 24 surrounding the rotor 10 ; a plurality of teeth 25 extending radially inward from the core back 24 ; and a protrusion 26 protruding radially outward from the core back 24 .

[0022] The core back 24 is in a generally annular shape with the central axis J as the center. The radial dimension between the inner circumference and the outer circumference of the core back 24, i.e., the radial thickness of the core back 24, is smaller than the circumferential dimension of the portion of the teeth 25 connected to the core back 24, i.e., the radial outer end of the teeth 25. The plurality of teeth 25 are arranged at intervals in the circumferential direction. More specifically, the plurality of teeth 25 are arranged at equal intervals in one circumference. In the present embodiment, six teeth 25 are provided.

[0023] The protrusion 26, when viewed in the axial direction, has a roughly trapezoidal shape whose circumferential dimension increases toward the radial outside. In the present embodiment, the axial dimension of the protrusion 26 is the same as the axial dimension of the core back 24 and the axial dimension of the tooth 25. The protrusion 26 has a core recess 26a that is recessed radially inward from the radially outer surface of the protrusion 26. In the present embodiment, the core recess 26a is a groove that extends in the axial direction and is open on both sides of the axial direction. The interior of the core recess 26a is roughly rectangular when viewed in the axial direction. The core recess 26a is provided in the circumferential center portion of the radially outer surface of the protrusion 26. As Figure 2 As shown, the upper portion of the core recess 26a is filled with the resin constituting the first case 60. The lower portion of the core recess 26a is a void portion that is not filled with the resin.

[0024] like Figure 3As shown, a plurality of protrusions 26 are provided at intervals in the circumferential direction. In the present embodiment, four protrusions 26 are provided. Each protrusion 26 is connected to a portion of the core back 24 located between the teeth 25 adjacent to each other in the circumferential direction. Therefore, even if the protrusion 26 is provided, the flow of magnetic flux between the core back 24 and the teeth 25 can be made less obstructed. Each protrusion 26 is connected to the circumferential center of each portion of the core back 24 located between the teeth 25 adjacent to each other in the circumferential direction. The four protrusions 26 include a pair of protrusions 26 arranged with one tooth 25 in the circumferential direction and a pair of protrusions 26 arranged with another tooth 25 in the circumferential direction. The tooth 25 located between the pair of protrusions 26 in the circumferential direction and the tooth 25 located between the other pair of protrusions 26 in the circumferential direction are arranged with the central axis J in the radial direction. The plurality of coils 23 are respectively mounted on the plurality of teeth 25 via the insulator 22. The plurality of coils 23 are electrically connected to the substrate 95 via the conductive component 90.

[0025] like Figure 2 As shown, the fixed shaft 30 extends in the axial direction. In more detail, the fixed shaft 30 is in a substantially cylindrical shape extending in the axial direction with the central axis J as the center. The fixed shaft 30 is located radially inside the bearing portion 15 of the rotor 10. The fixed shaft 30 passes through the radially inside of the bearing portion 15 in the axial direction. The fixed shaft 30 protrudes further to both sides of the axial direction than the bearing portion 15. The fixed shaft 30 is loosely fitted in the radially inside of the bearing portion 15. The fixed shaft 30 supports the inner peripheral surface of the bearing portion 15, thereby supporting the rotor 10 to be rotatable.

[0026] The upper end of the fixed shaft 30 is embedded in the shaft holding portion 69c of the first housing 60 to be held. The fixed shaft 30 extends downward from the shaft holding portion 69c. The lower end of the fixed shaft 30 is located below the rotor housing portion 64 to be described later. A pair of shaft recesses 31 are provided in the portion of the fixed shaft 30 where the shaft holding portion 69c is embedded, and are arranged with the center axis J in the radial direction. By positioning a portion of the resin constituting the shaft holding portion 69c in the pair of shaft recesses 31, the fixed shaft 30 is prevented from being detached from the shaft holding portion 69c.

[0027] The pump part 40 is connected to the lower side of the rotor 10. In the present embodiment, the pump part 40 is an impeller. When the rotor 10 rotates around the central axis J, the pump part 40 rotates around the central axis J. The pump part 40 is made of resin. The pump part 40 has an impeller body part 41, a shroud part 42 and a plurality of blade parts 43. In the present embodiment, the impeller body part 41 is connected to the end of the lower side of the second resin part 14. The second resin part 14 and the impeller body part 41 are part of the same single component. The impeller body part 41 is made at the same time when the second resin part 14 is made by insert molding. The impeller body part 41 is roughly disk-shaped with the central axis J as the center. The outer diameter of the impeller body part 41 is larger than the outer diameter of the lower end part of the second resin part 14.

[0028] The shroud portion 42 is separate from the impeller body portion 41. The shroud portion 42 is arranged at intervals on the lower side of the impeller body portion 41. The shroud portion 42 is in the shape of a ring centered on the central axis J. The plurality of blade portions 43 are located between the impeller body portion 41 and the shroud portion 42 in the axial direction. The plurality of blade portions 43 are arranged at intervals in the circumferential direction. The lower ends of the plurality of blade portions 43 are connected to the shroud portion 42. In the present embodiment, the shroud portion 42 and the plurality of blade portions 43 are part of the same single component. The upper ends of the plurality of blade portions 43 are in contact with the impeller body portion 41.

[0029] like Figure 1 and Figure 6 As shown in FIG. 1 , in this embodiment, the first housing 60 is a substantially cylindrical component centered on the central axis J. Figure 2 As shown, the first housing 60 includes: a rotor housing portion 64 that houses the rotor 10; a substrate housing portion 65 that houses the substrate 95; and a partition portion 69 that partitions the inside of the rotor housing portion 64 from the inside of the substrate housing portion 65. That is, the housing 50 includes the rotor housing portion 64, the substrate housing portion 65, and the partition portion 69.

[0030] The rotor housing portion 64 is in the shape of a cylinder surrounding the central axis J and opening at the lower side. In the present embodiment, the rotor housing portion 64 is in the shape of a general cylinder centered on the central axis J and opening at the lower side. The wall portion located on the upper side of the wall portion constituting the rotor housing portion 64 is constituted by the partition portion 69. The rotor housing portion 64 has a first circumferential wall portion 64a. The first circumferential wall portion 64a is a portion located on the radially outer side of the rotor 10 among the wall portions constituting the rotor housing portion 64. The first circumferential wall portion 64a extends downward from the radially outer peripheral edge portion of the partition portion 69. The first circumferential wall portion 64a is in the shape of a cylinder surrounding the central axis J and opening at the lower side. In more detail, the first circumferential wall portion 64a is in the shape of a general cylinder centered on the central axis J and opening at the lower side. The stator 20 is embedded in the first circumferential wall portion 64a.

[0031] The substrate storage portion 65 is located on the upper side of the rotor storage portion 64. The substrate storage portion 65 is in the shape of a tube that surrounds the central axis J and is open on the upper side. Among the wall portions constituting the substrate storage portion 65, the wall portion located on the lower side is constituted by the partition portion 69. The substrate storage portion 65 is a portion that stores the substrate 95 inside. The substrate storage portion 65 has a second peripheral wall portion 65a as a peripheral wall portion that surrounds the substrate 95 around the central axis J. The second peripheral wall portion 65a is in the shape of a tube that surrounds the central axis J and is open on the upper side. In more detail, the second peripheral wall portion 65a is in the shape of a substantially cylindrical tube that is centered on the central axis J and is open on the upper side.

[0032] The radial inner side surface of the second circumferential wall portion 65a is located radially outwardly relative to the radial inner side surface of the first circumferential wall portion 64a. The radial thickness of the second circumferential wall portion 65a is smaller than the radial thickness of the first circumferential wall portion 64a. The radial thickness of the first circumferential wall portion 64a is equal to the radial distance between the radial inner side surface of the first circumferential wall portion 64a and the radial outer side surface of the first circumferential wall portion 64a. The radial thickness of the second circumferential wall portion 65a is equal to the radial distance between the radial inner side surface of the second circumferential wall portion 65a and the radial outer side surface of the second circumferential wall portion 65a. A cover member 51 is fixed to the upper end portion of the second circumferential wall portion 65a. The upper end portion of the second circumferential wall portion 65a is the upper end portion of the substrate storage portion 65. The cover member 51 closes the upper opening of the second circumferential wall portion 65a, that is, the upper opening of the substrate storage portion 65. As Figure 1 As shown, the cover member 51 is provided with a connector portion 52 protruding upward.

[0033] like Figure 2 As shown in FIG. 1 , the partition 69 is located radially inside the upper end of the first peripheral wall portion 64a. The radial outer edge of the partition 69 is connected to the radial inner edge of the first peripheral wall portion 64a. The partition 69 covers the rotor 10 from the upper side. Figure 6 As shown in FIG. 1 , the partition 69 includes a first partition wall 69a, a second partition wall 69b, and an axis retaining portion 69c. In the present embodiment, the axis retaining portion 69c is substantially rectangular. The axis retaining portion 69c is disposed at a position where the central axis J passes. Figure 7 As shown, the shaft holding portion 69c holds the upper end of the fixed shaft 30. In this embodiment, the upper end of the fixed shaft 30 is embedded in the shaft holding portion 69c. The bearing portion 15 is located at the lower side of the shaft holding portion 69c. Figure 7 In the embodiment, the upper end surface of the bearing 15 is in contact with the lower surface of the shaft holding portion 69c, but the present invention is not limited thereto. The upper end surface of the bearing 15 may be spaced downward from the lower surface of the shaft holding portion 69c.

[0034] The first partition wall 69a and the second partition wall 69b are wall portions that separate the interior of the rotor housing portion 64 and the interior of the substrate housing portion 65 in the axial direction. The first partition wall 69a and the second partition wall 69b are arranged at a position overlapping the interior of the rotor housing portion 64 and the interior of the substrate housing portion 65 when viewed in the axial direction. In the present embodiment, the first partition wall 69a and the second partition wall 69b are located radially outside the shaft holding portion 69c. The first partition wall 69a and the second partition wall 69b are connected to the radial outer edge of the shaft holding portion 69c. The circumferential positions of the first partition wall 69a and the second partition wall 69b are different from each other.

[0035] like Figure 6As shown, the first partition wall 69a extends in the circumferential direction. The radial inner edge of the first partition wall 69a is connected to the radial outer edge of the shaft holding portion 69c. The first partition wall 69a has a first portion 69d and a second portion 69e connected to one circumferential side of the first portion 69d. The first portion 69d is located at the same position as the upper end of the shaft holding portion 69c in the axial direction. The upper end surface of the first portion 69d is connected to the upper end surface of the shaft holding portion 69c smoothly without a step. The second portion 69e is located at a position higher than the upper end of the shaft holding portion 69c. Thus, in the present embodiment, the first partition wall 69a is located at the same position as the upper end of the shaft holding portion 69c in the axial direction or at a position higher than the upper end of the shaft holding portion 69c. A step portion 69f is provided between the upper end surface of the second portion 69e and the upper end surface of the shaft holding portion 69c. The circumferential dimension of the second portion 69e is larger than the circumferential dimension of the first portion 69d.

[0036] The second partition wall 69b is located below the first partition wall 69a. The second partition wall 69b is located below the upper end of the shaft holding portion 69c. Figure 7 As shown, the second partition wall 69b is located at a lower side than the upper end of the fixed shaft 30. The radial inner edge of the second partition wall 69b is connected to the radial outer edge of the lower part of the shaft holding portion 69c. In this embodiment, the second partition wall 69b is located at an upper side than the lower end of the shaft holding portion 69c. Figure 8 As shown, the second partition wall 69b extends in the circumferential direction. The circumferential dimension of the second partition wall 69b is larger than the circumferential dimension of the first partition wall 69a.

[0037] like Figure 2 As shown, the axial thickness of the first partition wall 69a and the axial thickness of the second partition wall 69b are smaller than the radial thickness of the second peripheral wall portion 65a. In the present embodiment, the axial thickness of the first partition wall 69a and the axial thickness of the second partition wall 69b are smaller than the thickness of the substrate 95. In the present embodiment, the thickness of the substrate 95 refers to the axial dimension of the substrate 95. In the present embodiment, the axial thickness of the first partition wall 69a and the axial thickness of the second partition wall 69b are the same as each other.

[0038] The axial thickness of the first partition wall 69a is, for example, the same over the entire first partition wall 69a. The axial thickness of the second partition wall 69b is, for example, the same over the entire second partition wall 69b. In addition, the first partition wall 69a may also have portions with different axial thicknesses. The second partition wall 69b may also have portions with different axial thicknesses.

[0039] At least one of the first partition wall 69a and the second partition wall 69b may have a portion whose axial position changes on the surface facing the inside of the rotor housing portion 64. The portion whose axial position changes may be an inclined surface inclined relative to a surface orthogonal to the axial direction, a stepped surface, or a surface of a concave portion recessed in the axial direction or a surface of a convex portion protruding in the axial direction. By providing the portion whose axial position changes on the surface of at least one of the first partition wall 69a and the second partition wall 69b facing the inside of the rotor housing portion 64, the surface area of ​​the inner surface of at least one of the first concave portion 69g and the second concave portion 69h can be increased. As a result, the heat transferred from the heat conducting member 120 to the partition portion 69 can be more easily released to the water W in the rotor housing portion 64. Therefore, the heat dissipation of the substrate 95 can be further improved.

[0040] like Figure 8 As shown, the partition 69 has a first rib 66 provided on a portion of the partition 69 facing the inside of the rotor housing 64. In the present embodiment, the first rib 66 extends in the radial direction. The radially inner end of the first rib 66 is connected to the radially outer edge of the lower end of the shaft holding portion 69c. The radially outer end of the first rib 66 is connected to the radially inner edge of the first peripheral wall portion 64a of the rotor housing 64. A plurality of first ribs 66 are provided at intervals in the circumferential direction. In the present embodiment, a plurality of first ribs 66 are arranged at equal intervals throughout the circumferential direction. In the present embodiment, eight first ribs 66 are provided. The first rib 66 has a substantially quadrangular prism shape. In the present embodiment, the lower surface of the first rib 66 is located above the lower surface of the shaft holding portion 69c. In addition, the lower surface of the first rib 66 may be located at the same position as the lower surface of the shaft holding portion 69c in the axial direction, or may be located below the lower surface of the shaft holding portion 69c.

[0041] In the present embodiment, the first rib 66 is respectively arranged on the first partition wall 69a and the second partition wall 69b. The plurality of first ribs 66 include a first rib 66a protruding from the lower side of the first partition wall 69a and a first rib 66b protruding from the lower side of the second partition wall 69b. A plurality of first ribs 66a and first ribs 66b are provided. In the present embodiment, four first ribs 66a and four first ribs 66b are provided respectively. The number of the first ribs 66a and the number of the first ribs 66b may be different from each other. Two of the four first ribs 66a are first ribs 66a arranged at the boundary portion in the circumferential direction between the first partition wall 69a and the second partition wall 69b. The end of one side of the circumferential direction of the second partition wall 69b is connected to one of the two first ribs 66a, and the end of the other side of the circumferential direction of the second partition wall 69b is connected to the other side. The axial dimension of the first rib 66a is greater than the axial dimension of the first rib 66b. In this embodiment, the lower surface of the first rib 66a and the lower surface of the first rib 66b are located at the same position in the axial direction. The lower surface of the first rib 66a and the lower surface of the first rib 66b may be located at different positions in the axial direction.

[0042] like Figure 6 As shown, the partition 69 has a second rib 67 provided on a portion of the partition 69 facing the interior of the substrate storage portion 65. The second rib 67 protrudes upward from the first partition wall 69a. The second rib 67 is not provided on the second partition wall 69b. That is, in the present embodiment, the second rib 67 is provided only on the first partition wall 69a of the first partition wall 69a and the second partition wall 69b.

[0043] In the present embodiment, the second rib 67 extends radially. The radially inner end of the second rib 67 is located at the radial outer edge of the end surface on the upper side of the shaft retaining portion 69c. The radially outer end of the second rib 67 is connected to the circumferential rib 69k extending in the circumferential direction. The circumferential rib 69k is arranged at the radial inner edge of the end on the upper side of the first peripheral wall portion 64a. The circumferential rib 69k is a rib in a substantially semicircular arc shape protruding upward. A plurality of second ribs 67 are arranged at intervals in the circumferential direction. In the present embodiment, a plurality of second ribs 67 are arranged at equal intervals in the circumferential direction. In the present embodiment, four second ribs 67 are provided. The second rib 67 has a substantially quadrangular prism shape. The plurality of second ribs 67 include a second rib 67 located at the circumferential boundary portion between the first portion 69d and the second portion 69e. The upper surface of the second rib 67 and the upper surface of the circumferential rib 69k are located at the same position in the axial direction. The upper surface of the second rib 67 may be located at a position different from the upper surface of the circumferential rib 69 k in the axial direction.

[0044] The first rib 66 and the second rib 67 correspond to ribs provided on at least one of the first partition wall 69a and the second partition wall 69b. That is, the partition portion 69 has ribs provided on at least one of the first partition wall 69a and the second partition wall 69b, including the first rib 66 and the second rib 67.

[0045] like Figure 8 As shown, the partition 69 has a first recess 69g and a second recess 69h that are recessed upward and open at the lower side. In the present embodiment, the first recess 69g and the second recess 69h are arranged between the first peripheral wall portion 64a and the shaft retaining portion 69c in the radial direction. The first recess 69g is composed of the first peripheral wall portion 64a, the shaft retaining portion 69c, the first partition wall 69a, and a pair of first ribs 66 adjacent to each other in the circumferential direction. The first partition wall 69a constitutes the wall portion on the upper side of the first recess 69g. In other words, the first partition wall 69a constitutes the wall portion located on the upper side of the wall portion constituting the first recess 69g. The second recess 69h is composed of the first peripheral wall portion 64a, the shaft retaining portion 69c, the second partition wall 69b, and a pair of first ribs 66 adjacent to each other in the circumferential direction. The second partition wall 69b constitutes the wall portion on the upper side of the second recess 69h. In other words, the second partition wall 69b constitutes a wall portion located on the upper side of the wall portion constituting the second recess 69h. A plurality of first recesses 69g are arranged in a circumferential direction. In the present embodiment, three first recesses 69g are provided. A plurality of second recesses 69h are arranged in a circumferential direction. In the present embodiment, five second recesses 69h are provided.

[0046] like Figure 6 As shown, the partition 69 has a third recessed portion 69j that is recessed toward the bottom and open at the top. In the present embodiment, the third recessed portion 69j is provided between the first peripheral wall portion 64a and the shaft retaining portion 69c in the radial direction. At least a portion of the wall portion located at the bottom of the wall portion constituting the third recessed portion 69j is constituted by the second partition wall 69b. In the present embodiment, the second partition wall 69b constitutes a portion of the wall portion located at the bottom of the wall portion constituting the third recessed portion 69j.

[0047] like Figure 1 As shown, the first housing 60 includes a large diameter housing portion 61 and a small diameter housing portion 62 connected to the upper side of the large diameter housing portion 61. The lower end of the large diameter housing portion 61 is the lower end of the first housing 60. Figure 2As shown, the upper end of the large diameter housing portion 61 is located above the upper end of the stator core 21. The large diameter housing portion 61 is composed of a portion of the first peripheral wall portion 64a. The lower end of the large diameter housing portion 61 is the lower end of the first peripheral wall portion 64a. At least a portion of the stator core 21 is embedded in the large diameter housing portion 61 and retained. In the present embodiment, the entire stator core 21 is embedded in the large diameter housing portion 61. The upper end of the small diameter housing portion 62 is the upper end of the first housing 60. The outer diameter of the small diameter housing portion 62 is smaller than the outer diameter of the large diameter housing portion 61. The small diameter housing portion 62 is composed of a portion of the first peripheral wall portion 64a and the second peripheral wall portion 65a of the substrate storage portion 65.

[0048] like Figure 2 As shown, the second shell 70 is located on the lower side of the first shell 60. The second shell 70 is fixed to the first shell 60. In the present embodiment, the second shell 70 is made of resin. The second shell 70 has: an annular bottom wall portion 71 surrounding the central axis J; and an annular wall portion 72 protruding upward from the radial outer edge portion of the bottom wall portion 71. The bottom wall portion 71 is located on the lower side of the pump portion 40. The radially outer end of the bottom wall portion 71 is located radially outward of the pump portion 40. The annular wall portion 72 is fixed to the first shell 60. The pump portion 40 is housed radially inside the annular wall portion 72.

[0049] The second shell 70 has a suction port 74a and a flow path portion 76. The suction port 74a protrudes downward from the radial inner edge portion of the bottom wall portion 71. In the present embodiment, the suction port 74a is roughly cylindrical centered on the central axis J. The suction port 74a opens on the lower side. The flow path portion 76 is located radially outside the pump portion 40. The flow path portion 76 is arranged radially between the pump portion 40 and the annular wall portion 72. The flow path portion 76 extends in the circumferential direction.

[0050] like Figure 1 As shown, the second housing 70 has a discharge port 74b. The discharge port 74b is in the shape of a tube extending from the annular wall portion 72 in a direction perpendicular to the axial direction. The end of the downstream side of the flow path portion 76 is connected to the discharge port 74b. When the rotor 10 rotates and the pump portion 40 rotates, water W is sucked into the pump portion 40 from the suction port 74a. The water W sucked into the pump portion 40 is discharged from the pump portion 40 to the outside in the radial direction, flows in the circumferential direction along the flow path portion 76, and is discharged to the outside of the pump 100 from the discharge port 74b. In addition, a portion of the water W sucked from the suction port 74a also flows into the rotor housing portion 64.

[0051] like Figure 5As shown, the water W flowing into the rotor housing portion 64 flows upward between the rotor 10 and the stator 20 in the radial direction, and flows toward the upper side of the rotor 10. More specifically, the water W flowing into the rotor housing portion 64 flows between the radial outer side surface of the rotor 10 and the radial inner side surface of the rotor housing portion 64, and flows toward the upper side of the rotor 10. At least a portion of the water W flowing toward the upper side of the rotor 10 flows into the first recess 69g and the second recess 69h. The water W flowing toward the upper side of the rotor 10 flows radially inward in the axial gap between the bearing portion 15 and the shaft holding portion 69c or the third groove portion 15c and flows into the interior of the bearing portion 15. The water W flowing into the interior of the bearing portion 15 flows downward in the radial gap between the bearing portion 15 and the fixed shaft 30 or the first groove portion 15a, and flows into the lower side of the first groove portion 15a in the interior of the bearing portion 15. The water W that has flowed into the portion below the first groove 15 a in the bearing 15 flows radially outward in an axial gap between the bearing 15 and a gasket 32 ​​described later or in the second groove 15 b and flows into the pump 40 .

[0052] like Figure 2 As shown, the second housing 70 has a support portion 75 that supports the rotor 10 from the bottom. The support portion 75 has a support body portion 75a and a plurality of legs 75b. The support body portion 75a supports the rotor 10 from the bottom via the gasket 32. The fixed shaft 30 passes through the inner side of the gasket 32 ​​in the axial direction. The gasket 32 ​​contacts the upper end of the support body portion 75a and the lower end of the bearing portion 15. The plurality of legs 75b extend upward from the inner circumferential surface of the suction port 74a. The upper ends of the plurality of legs 75b are connected to the support body portion 75a.

[0053] like Figure 2 As shown, the retaining component 80 is located on the upper side of the stator 20. The retaining component 80 is supported by the stator 20 from the lower side. In the present embodiment, the retaining component 80 is made of resin. At least a portion of the retaining component 80 is embedded in and retained in the first shell 60. In the present embodiment, substantially the entirety of the retaining component 80 is embedded in the first shell 60. The retaining component 80 retains the conductive component 90. The conductive component 90 is made of metal. In the present embodiment, the conductive component 90 is a sheet metal component. In the present embodiment, a plurality of conductive components 90 are arranged at intervals in the circumferential direction. The conductive component 90 electrically connects the coil 23 to the substrate 95. A portion of the conductive component 90 is embedded in and retained in the first shell 60.

[0054] The substrate 95 is housed inside the housing 50. More specifically, the substrate 95 is housed inside the substrate housing portion 65. The substrate 95 is, for example, a printed wiring substrate. In the present embodiment, an inverter circuit for supplying power to the coil 23 is provided on the substrate 95. The plate surface of the substrate 95 faces the axial direction. The plate surface of the substrate 95 is, for example, orthogonal to the axial direction. The substrate 95 is, for example, roughly in the shape of a circular plate. The substrate 95 is supported from the bottom by a protruding support portion 68 provided in the substrate housing portion 65. Figure 6 As shown, the protruding support portion 68 is in a roughly cylindrical shape protruding upward from the first circumferential wall portion 64a. A plurality of protruding support portions 68 are provided at intervals in the circumferential direction. For example, more than three protruding support portions 68 are provided. The protruding support portion 68 has a large diameter portion 68a and a small diameter portion 68b connected to the upper side of the large diameter portion 68a. The outer diameter of the small diameter portion 68b is smaller than the outer diameter of the large diameter portion 68a. Although not shown in the figure, the small diameter portion 68b passes through a through hole provided in the substrate 95 in the axial direction. The upper end of the large diameter portion 68a contacts the peripheral edge of the through hole in the lower surface of the substrate 95 through which the small diameter portion 68b passes. Therefore, the substrate 95 is supported from the lower side by the protruding support portion 68.

[0055] like Figure 7 As shown, a plurality of electronic components 96 are mounted on the substrate 95. The plurality of electronic components 96 include a first electronic component 96a, a second electronic component 96b, and a third electronic component 96c. In the present embodiment, the first electronic component 96a is mounted on the upper surface of the substrate 95. The first electronic component 96a is, for example, a field effect transistor (FET: Field Effect Transistor) constituting an inverter circuit. The first electronic component 96a overlaps with the first partition wall 69a when viewed in the axial direction.

[0056] The second electronic component 96b is mounted on the surface of the lower side of the substrate 95. The second electronic component 96b is an electronic component 96 with a larger axial dimension than the first electronic component 96a. The second electronic component 96b is, for example, an electrolytic capacitor. The second electronic component 96b is, for example, a substantially cylindrical shape protruding downward from the lower surface of the substrate 95. The second electronic component 96b overlaps with the second partition wall 69b when viewed in the axial direction. The lower part of the second electronic component 96b is inserted into the interior of the third recess 69j. The lower end of the second electronic component 96b is located at a position lower than the upper end of the shaft holding portion 69c and is located radially outward of the shaft holding portion 69c. In the present embodiment, the lower end of the second electronic component 96b is located at a position lower than the upper end of the fixed shaft 30 and is located radially outward of the fixed shaft 30. The lower end of the second electronic component 96b is arranged away from the upper surface of the second partition wall 69b.

[0057] The third electronic component 96c is mounted on the lower surface of the substrate 95. The third electronic component 96c is an electronic component 96 with an axial dimension larger than that of the first electronic component 96a and smaller than that of the second electronic component 96b. The third electronic component 96c is, for example, a choke coil. The third electronic component 96c overlaps the shaft holding portion 69c and the fixed shaft 30 when viewed in the axial direction. The lower end of the third electronic component 96c is arranged away from the upper surface of the shaft holding portion 69c.

[0058] A heat conducting component 120 in contact with the partition 69 and the substrate 95 is provided between the partition 69 and the substrate 95. Therefore, the heat of the substrate 95 can be transferred from the heat conducting component 120 to the partition 69. Since the partition 69 separates the interior of the rotor housing portion 64 from the interior of the substrate housing portion 65, the heat transferred to the partition 69 is released into the water W flowing into the rotor housing portion 64. Thus, the heat of the substrate 95 can be released into the fluid, i.e., water W, transported by the pump portion 40. Fluids such as water W have a higher thermal conductivity than air. Therefore, compared with the case where the heat of the substrate 95 is released to the air outside the pump 100, the heat dissipation of the substrate 95 can be improved. In the present embodiment, as Figure 7 As shown by arrows H in FIG. 1 , the heat transferred to the heat conducting member 120 is released to the water W in the rotor housing portion 64 via the first partition wall 69 a and the second partition wall 69 b .

[0059] In addition, for example, when the heat of the substrate 95 is released to the air outside the pump 100, a radiator or the like is sometimes provided on the outer surface of the housing 50 in order to improve the heat dissipation. In contrast, according to the present embodiment, since the heat can be released to the water W having a higher thermal conductivity than the air, the heat dissipation of the substrate 95 can be improved without providing a radiator or the like. Therefore, the increase in the number of components of the pump 100 can be suppressed, and the heat dissipation of the substrate 95 can be improved.

[0060] In addition, in the present embodiment, the second electronic component 96b having an axial dimension larger than the first electronic component 96a is mounted on the lower surface of the substrate 95 and is arranged at a position overlapping with the second partition wall 69b located at a position lower than the first partition wall 69a when viewed in the axial direction. Therefore, by lowering the axial position of the second partition wall 69b overlapping with the second electronic component 96b having an axial dimension larger in the axial direction downward, it is possible to suppress the second electronic component 96b from contacting the partition 69, and to suppress the pump 100 from becoming larger in the axial direction. In addition, the heat of the second electronic component 96b can be easily released to the water W in the rotor housing 64 via the second partition wall 69b.

[0061] Furthermore, by arranging the first partition wall 69a, which is different from the second partition wall 69b that overlaps the second electronic component 96b having a large axial dimension in the axial direction, on the upper side of the second partition wall 69b, the first partition wall 69a can be brought close to the substrate 95. Therefore, the substrate 95 can be brought close to the portion of the inside of the rotor housing portion 64 that is separated by the first partition wall 69a and the inside of the substrate housing portion 65, and the path of heat that moves from the substrate 95 to the water W in the rotor housing portion 64 through the heat-conducting member 120 and the first partition wall 69a can be shortened. Thus, the heat of the substrate 95 can be more appropriately released to the water W in the rotor housing portion 64 through the heat-conducting member 120 and the first partition wall 69a. Therefore, the heat dissipation of the substrate 95 can be further improved. In addition, since the axial distance between the substrate 95 and the first partition wall 69a can be shortened, the volume of the heat-conducting member 120 located between the substrate 95 and the first partition wall 69a can be reduced. Therefore, the material cost of the heat-conducting member 120 can be reduced, and the manufacturing cost of the pump 100 can be reduced.

[0062] In addition, according to the present embodiment, the first electronic component 96a overlaps the first partition wall 69a when viewed in the axial direction. Therefore, the heat of the first electronic component 96a can be easily released to the water W in the rotor housing portion 64 via the first partition wall 69a. Thus, the heat dissipation of the substrate 95 can be further improved.

[0063] In addition, according to the present embodiment, the first partition wall 69a and the second partition wall 69b are located radially outside the shaft holding portion 69c, and the circumferential positions are different from each other. Therefore, it is easy to arrange the first partition wall 69a and the second partition wall 69b at a position opposite to the rotor 10 in the axial direction. As a result, it is easy to release heat to the water W flowing in the axial direction between the rotor 10 and the partition portion 69 via the first partition wall 69a and the second partition wall 69b. Therefore, the heat dissipation of the substrate 95 can be further improved.

[0064] In addition, according to the present embodiment, the second partition wall 69b is located below the upper end of the shaft holding portion 69c. Therefore, the axial position of the second electronic component 96b overlapping the second partition wall 69b in the axial direction can be made lower, which can further suppress the axial enlargement of the pump 100.

[0065] In addition, according to the present embodiment, the lower end of the second electronic component 96b is located below the upper end of the shaft holding portion 69c and radially outward of the shaft holding portion 69c. Therefore, the second electronic component 96b can be arranged further downward, and the pump 100 can be further prevented from being enlarged in the axial direction.

[0066] In addition, according to the present embodiment, the first partition wall 69a is located at the same position as the upper end of the shaft holding portion 69c in the axial direction or at a position higher than the upper end of the shaft holding portion 69c. Therefore, the first partition wall 69a can be arranged at a higher side, and the first partition wall 69a can be made closer to the substrate 95 in the axial direction. As a result, the heat of the substrate 95 can be more easily released to the water W in the rotor housing portion 64 via the first partition wall 69a, and the heat dissipation of the substrate 95 can be further improved.

[0067] In addition, according to the present embodiment, the inner surface of the bearing portion 15 is provided with a first groove portion 15a which is open on both sides in the axial direction. Figure 5 As described above, the water W located on the upper side of the rotor 10 in the rotor housing portion 64 can be easily flowed to the lower side through the inside of the bearing portion 15. As a result, the water W that releases heat from the first partition wall 69a and the second partition wall 69b can be easily discharged to the outside of the rotor housing portion 64, and new water W can be easily flowed into the upper side of the rotor 10. Therefore, the water W located between the rotor 10 and the first partition wall 69a and the second partition wall 69b can be easily replaced with water W with a relatively low temperature, and the heat can be easily released from the first partition wall 69a and the second partition wall 69b to the water W. Therefore, the heat dissipation of the substrate 95 can be further improved.

[0068] In addition, according to the present embodiment, the second groove portion 15b extending from the inner peripheral surface of the bearing portion 15 to the outer peripheral surface of the bearing portion 15 is provided on the lower end surface of the bearing portion 15. The inside of the second groove portion 15b is directly or indirectly connected to the inside of the first groove portion 15a. Therefore, the water W flowing downward in the first groove portion 15a can be easily discharged from the inside of the bearing portion 15 through the second groove portion 15b. Therefore, the water W can be made to flow more easily between the rotor 10 and the first partition wall 69a and the second partition wall 69b. In particular, the pressure of the water W flowing into the upper side of the rotor 10 in the rotor housing portion 64 is likely to be higher than the pressure of the water W in the pump portion 40. Therefore, the rotor 10 is subjected to a downward force by the pressure of the water W flowing into the upper side of the rotor 10, and the lower end of the bearing portion 15 is likely to be pressed by the gasket 32. In this case, the lower end of the bearing portion 15 is blocked by the gasket 32, and the water W may be difficult to be discharged to the outside of the bearing portion 15. Even in this case, the second groove 15b can be provided to easily release the water W in the bearing 15. In addition, the water W flowing to the upper side of the rotor 10 can be easily released to the lower side through the inside of the bearing 15, thereby preventing the pressure of the water W on the upper side of the rotor 10 from becoming too high. In addition, the lower end surface of the bearing 15 can be arranged to be separated from the gasket 32 ​​to the upper side.

[0069] In addition, according to the present embodiment, the axial thickness of the first partition wall 69a and the axial thickness of the second partition wall 69b are smaller than the radial thickness of the second peripheral wall portion 65a of the substrate storage portion 65. Therefore, the axial thickness of the first partition wall 69a and the axial thickness of the second partition wall 69b can be appropriately reduced, and heat can be easily passed through the first partition wall 69a and the second partition wall 69b. As a result, it is easier to release heat from the heat conducting member 120 to the water W inside the rotor storage portion 64 through the first partition wall 69a and the second partition wall 69b. Therefore, the heat dissipation of the substrate 95 can be further improved.

[0070] In addition, according to the present embodiment, the axial thickness of the first partition wall 69a and the axial thickness of the second partition wall 69b are smaller than the thickness of the substrate 95. Therefore, the axial thickness of the first partition wall 69a and the axial thickness of the second partition wall 69b can be more appropriately reduced, and the heat dissipation of the substrate 95 can be more appropriately improved.

[0071] In addition, according to the present embodiment, the partition 69 has a first recess 69g and a second recess 69h that are recessed upward and open at the bottom. The first partition wall 69a constitutes the wall portion on the upper side of the first recess 69g. The second partition wall 69b constitutes the wall portion on the upper side of the second recess 69h. Therefore, by allowing the water W flowing toward the upper side of the rotor 10 to flow into the first recess 69g and the second recess 69h, the water W can be easily contacted with the first partition wall 69a and the second partition wall 69b. As a result, it is easier to release heat from the first partition wall 69a and the second partition wall 69b to the water W, and the heat dissipation of the substrate 95 can be further improved.

[0072] In addition, according to the present embodiment, the partition 69 has the first rib 66 and the second rib 67 as ribs provided on at least one of the first partition wall 69a and the second partition wall 69b. Therefore, as described above, even if the axial thickness of the first partition wall 69a and the axial thickness of the second partition wall 69b are reduced in order to improve the heat dissipation of the substrate 95, the rigidity of the first partition wall 69a and the rigidity of the second partition wall 69b can be ensured by the ribs.

[0073] Furthermore, according to the present embodiment, the ribs provided in the partition 69 include the first ribs 66 provided on the portion of the partition 69 facing the inside of the rotor housing portion 64. Therefore, by providing the first ribs 66, the surface area of ​​the partition 69 in contact with the water W in the rotor housing portion 64 can be increased. Thus, the heat transferred from the heat conducting member 120 to the partition 69 can be more easily released to the water W in the rotor housing portion 64. Therefore, the heat dissipation of the substrate 95 can be further improved.

[0074] In the present embodiment, the heat conducting component 120 is constituted by a heat dissipation gap filler. Therefore, the heat dissipation gap filler is applied to the substrate storage portion 65 in an uncured state, and the substrate 95 on which a plurality of electronic components 96 are mounted is pressed onto the applied uncured heat dissipation gap filler while being arranged in the substrate storage portion 65, thereby enabling the substrate 95 to be properly in close contact with the uncured heat dissipation gap filler. In addition, the electronic components 96 mounted on the lower surface of the substrate 95 are easily embedded in the uncured heat dissipation gap filler, and the electronic components 96 mounted on the lower surface of the substrate 95 can also be properly in close contact with the heat dissipation gap filler. In a state where the substrate 95 and the electronic components 96 mounted on the lower surface of the substrate 95 are in close contact with the heat dissipation gap filler, the heat dissipation gap filler is cured to produce the heat conducting component 120, thereby enabling the substrate 95 and the electronic components 96 mounted on the lower surface of the substrate 95 to be properly in contact with the heat dissipation gap filler. Therefore, heat can be easily and appropriately transferred from the substrate 95 and the electronic component 96 to the heat conductive member 120 , and the heat dissipation performance of the substrate 95 can be further improved.

[0075] In the present embodiment, after the operator or the like who sets the substrate 95 in the substrate storage section 65 applies the uncured heat dissipation gap filler on the partition 69 using a dispenser or the like, the operator or the like allows the substrate 95 on which the plurality of electronic components 96 are mounted to approach from the upper side of the applied uncured heat dissipation gap filler. The operator or the like presses the substrate 95 on the uncured heat dissipation gap filler while supporting the substrate 95 from the lower side using the protruding support portion 68, and fixes the substrate 95 in the substrate storage section 65. At this time, the second electronic component 96b and the third electronic component 96c mounted on the lower side of the substrate 95 are buried in the uncured heat dissipation gap filler. Then, the operator or the like cures the uncured heat dissipation gap filler to produce the heat conductive component 120 in a state of contacting the partition 69 and the substrate 95. The method of curing the uncured heat dissipation gap filler can be appropriately adopted according to the material constituting the heat dissipation gap filler.

[0076] In addition, in this specification, "operators, etc." include operators who perform various operations and assembly equipment, etc. Each operation may be performed only by operators, only by assembly equipment, or by operators and assembly equipment.

[0077] The heat dissipation gap filler constituting the heat conductive component 120 has a viscosity such that when applied in an uncured state, the applied shape can be maintained without applying an external force. The heat dissipation gap filler constituting the heat conductive component 120 is a material that can be elastically deformed in a cured state. In a cured state, the heat dissipation gap filler constituting the heat conductive component 120 is in a state such as rubber, clay, etc. The heat dissipation gap filler constituting the heat conductive component 120 is a material in which a plurality of fillers having thermal conductivity are mixed into a resin. The resin constituting the heat dissipation gap filler is, for example, silicone. The filler constituting the heat dissipation gap filler is, for example, ceramic. The material constituting the heat dissipation gap filler is not particularly limited.

[0078] The thermal conductivity of the heat dissipation gap filler constituting the heat conductive member 120 is higher than the thermal conductivity of the material constituting the partition 69. The thermal conductivity of the heat dissipation gap filler constituting the heat conductive member 120 is, for example, 1.5 W / (m·K) or more and 5 W / (m·K) or less. The thermal conductivity of the material constituting the partition 69 is, for example, 0.2 W / (m·K) or more and 0.35 W / (m·K) or less. In the present embodiment, the material constituting the partition 69 is the material constituting the housing 50, and is a resin.

[0079] like Figure 7 As shown, in this embodiment, the second electronic component 96b is in contact with the heat conducting component 120. Therefore, at least a part of the heat generated in the second electronic component 96b is directly released to the heat conducting component 120. As a result, the heat dissipation of the second electronic component 96b can be improved, and the heat dissipation of the substrate 95 can be further improved. The second electronic component 96b is embedded in the heat conducting component 120. Therefore, the contact area between the heat conducting component 120 and the second electronic component 96b can be appropriately increased. As a result, the heat dissipation of the second electronic component 96b can be further improved, and the heat dissipation of the substrate 95 can be further improved. As described above, the heat conducting component 120 is composed of a heat dissipation gap filler, and by adopting a method of embedding the second electronic component 96b in the heat dissipation gap filler in an uncured state, the second electronic component 96b can be easily and appropriately embedded in the heat conducting component 120.

[0080] In the present embodiment, the second rib 67 is in contact with the heat conducting member 120. Therefore, the contact area between the partition 69 and the heat conducting member 120 can be easily increased, and heat can be more easily transferred from the heat conducting member 120 to the partition 69. In the present embodiment, the second rib 67 is embedded in the heat conducting member 120. Therefore, the contact area between the heat conducting member 120 and the second rib 67 can be increased, and the contact area between the heat conducting member 120 and the partition 69 can be appropriately increased. As described above, the heat conducting member 120 is composed of a heat dissipation gap filler, and by adopting a method of applying an uncured heat dissipation gap filler on the partition 69, the second rib 67 can be easily and appropriately embedded in the heat conducting member 120.

[0081] In the present embodiment, by embedding the second rib 67 in the heat-conducting member 120, the upper surface of the second rib 67, the radially inner surface of the second rib 67, and the circumferential surface of the second rib 67 are in contact with the heat-conducting member 120. In addition, the so-called "the second rib 67 is in contact with the heat-conducting member 120" only requires that at least a part of the second rib 67 is in contact with the heat-conducting member 120, and the part of the second rib 67 that the heat-conducting member 120 contacts may be any part. For example, the heat-conducting member 120 may contact only one or two of the upper surface of the second rib 67, the radially inner surface of the second rib 67, and the circumferential surface of the second rib 67.

[0082] In addition, according to the present embodiment, the second rib 67 is provided only on the first partition wall 69a of the first partition wall 69a and the second partition wall 69b. Therefore, the second rib 67 is not provided on the upper surface of the second partition wall 69b. Thus, the second rib 67 can be prevented from contacting the lower end of the second electronic component 96b.

[0083] In the present embodiment, the third electronic component 96c is in contact with the heat conducting component 120. More specifically, the third electronic component 96c is embedded in the heat conducting component 120. The portion of the lower surface of the substrate 95 that overlaps with the partition 69 when viewed in the axial direction is in contact with the heat conducting component 120, except for the portion where the electronic component 96 is mounted. The heat conducting component 120 has a portion located radially outside the partition 69. The heat conducting component 120 has a portion located above the radial inner edge of the first circumferential wall portion 64a of the rotor housing portion 64. In the present embodiment, the circumferential rib 69k is in contact with the heat conducting component 120. More specifically, the circumferential rib 69k is embedded in the heat conducting component 120.

[0084] <Second embodiment> like Fig. 9As shown, the partition 269 of the pump 200 of this embodiment has a connecting portion 269m that connects the inside of the first recess 69g and the inside of the second recess 69h. Therefore, the water W can flow between the inside of the first recess 69g and the inside of the second recess 69h via the connecting portion 269m. As a result, the flow of the water W can be more appropriately formed, and heat can be more appropriately and easily transferred from the first partition wall 69a and the second partition wall 69b to the water W. Therefore, the heat dissipation of the substrate 95 can be more appropriately improved.

[0085] In the present embodiment, the connection portion 269m is provided on a first rib 66a located at a boundary portion between the first partition wall 69a and the second partition wall 69b in the first rib 66. The connection portion 269m is a hole that penetrates the first rib 66a in a direction orthogonal to the radial direction in which the first rib 66a extends. The shape of the inner surface of the connection portion 269m is, for example, a plane orthogonal to the radial direction in which the first rib 66a provided with the connection portion 269m extends. The shape of the inner surface of the connection portion 269m is not particularly limited, and may be an inclined surface inclined relative to the radial direction in which the first rib 66a extends, or may be an arc-shaped surface. By setting the shape of the inner surface of the connection portion 269m to be a surface that smoothly connects the inner surface of the first recess 69g and the inner surface of the second recess 69h, it is possible to make it easier for water W to flow between the inside of the first recess 69g and the inside of the second recess 69h more appropriately.

[0086] In addition, the connecting portion 269m may be any structure as long as it can connect the inside of the first recess 69g and the inside of the second recess 69h. The connecting portion 269m may be provided on a plurality of first ribs 66, or may be provided on a portion other than the first rib 66 in the partition 69. The connecting portion 269m may also be a space portion formed by not providing a first rib 66a located at the boundary portion between the first partition wall 69a and the second partition wall 69b.

[0087] The other structures of the partition 269 are the same as those of the partition 69 of the first embodiment. The other structures of the pump 200 are the same as those of the pump 100 of the first embodiment.

[0088] The present invention is not limited to the above-mentioned embodiments, and other structures and methods may be adopted within the scope of the technical concept of the present invention. The heat-conducting component may be of any structure as long as it is located between the partition and the substrate and contacts the partition and the substrate. The heat-conducting component may be composed of heat-dissipating grease or a heat sink. The heat-conducting component may be a metal component. The heat-conducting component may not contact the second electronic component.

[0089] The first partition wall and the second partition wall can be arranged arbitrarily relative to each other as long as the second partition wall is located at a position closer to one side (lower side) in the axial direction than the first partition wall. At least a portion of the first partition wall can be located at a position closer to one side (lower side) in the axial direction than the end of the shaft holding portion on the other side (upper side) in the axial direction. The partition portion may not have at least one of the first recess and the second recess. The ribs provided on at least one of the first partition wall and the second partition wall may be only the first rib or only the second rib. The first rib may be provided only on either one of the first partition wall and the second partition wall. The second rib may be provided on both the first partition wall and the second partition wall, or may be provided only on the second partition wall of the first partition wall and the second partition wall. The type of the first electronic component, the type of the second electronic component, and the type of the third electronic component are not particularly limited. The first electronic component may not overlap with the first partition wall when viewed in the axial direction. The third electronic component may also not be provided. The number of multiple electronic components is not particularly limited as long as at least one first electronic component and one second electronic component are provided respectively. The number of first electronic components and the number of second electronic components are not particularly limited as long as they are more than one.

[0090] The substrate stored in the substrate storage portion may be a substrate for any purpose. The substrate may not have an inverter circuit for supplying power to the coil of the stator. The substrate may be a substrate connected to a rotation sensor capable of detecting the rotation of the rotor. The rotor may also have an axis that rotates around the central axis instead of a fixed axis.

[0091] The use of the pump of the present invention is not particularly limited. The pump can be installed on any equipment. The pump can be installed on a vehicle, for example. The pump can be a pump for conveying any fluid. The pump can be an oil pump for conveying oil.

[0092] Note that the present technology can adopt the following configurations. (1) A pump comprising: a rotor rotatable about a central axis; a stator radially opposed to the rotor with a gap therebetween; a pump unit connected to one axial side of the rotor; a housing having a rotor housing portion for housing the rotor; a substrate housed in the housing; and a plurality of electronic components mounted on the substrate, the housing having: a substrate housing portion located on the other axial side of the rotor housing portion and housing the substrate; and a partition portion separating the interior of the rotor housing portion from the interior of the substrate housing portion. The partition portion comprises a first partition wall and a second partition wall which axially separate the interior of the rotor housing portion from the interior of the substrate housing portion, the second partition wall being located on the axial side of the first partition wall, the plurality of electronic components comprising: a first electronic component; and a second electronic component which has an axial dimension larger than that of the first electronic component and is mounted on a surface on the axial side of the substrate, the second electronic component overlapping with the second partition wall when viewed in the axial direction, and a heat conduction component which is in contact with the partition portion and the substrate is provided between the partition portion and the substrate. (2) The pump according to (1), wherein the heat conductive member is formed of a heat dissipation gap filler. (3) The pump according to (1) or (2), wherein the second electronic component is in contact with the heat conductive member. (4) The pump according to any one of (1) to (3), wherein the first electronic component overlaps with the first partition wall when viewed in the axial direction. (5) A pump according to any one of (1) to (4), wherein the pump has a fixed shaft extending in the axial direction and supporting the rotor so as to be rotatable, the partition portion has a shaft retaining portion which retains the end portion on the other axial side of the fixed shaft, the first partition wall and the second partition wall are located radially outside the shaft retaining portion and have different circumferential positions from each other. (6) The pump according to (5), wherein the second partition wall is located on one side in the axial direction relative to the end portion on the other side in the axial direction of the shaft holding portion. (7) The pump according to (6), wherein an end portion of the second electronic component on one axial side is located axially further to one side than an end portion of the shaft holding portion on the other axial side and is located radially outward of the shaft holding portion. (8) A pump according to any one of (5) to (7), wherein the first partition wall is axially located at the same position as the end of the shaft retaining portion on the other axial side, or is located at a position axially closer to the other axial side than the end of the shaft retaining portion on the other axial side. (9) A pump according to any one of (5) to (8), wherein the rotor has a cylindrical bearing portion through which the fixed shaft passes in the axial direction, and a first groove portion opening on both sides in the axial direction is provided on an inner surface of the bearing portion. (10) A pump according to (9), wherein a second groove portion is provided on an end face on one axial side of the bearing portion and extends from an inner circumferential surface of the bearing portion to an outer circumferential surface of the bearing portion, and the interior of the second groove portion is directly or indirectly connected to the interior of the first groove portion. (11) A pump according to any one of (1) to (10), wherein the substrate storage portion has a peripheral wall portion surrounding the substrate around the central axis, and the axial thickness of the first partition wall and the axial thickness of the second partition wall are smaller than the radial thickness of the peripheral wall portion. (12) A pump according to any one of (1) to (11), wherein the partition portion has a first recess and a second recess that are recessed toward the other axial side and open on one axial side, the first partition wall constituting a wall portion on the other axial side of the first recess, and the second partition wall constituting a wall portion on the other axial side of the second recess. (13) The pump according to (12), wherein the partition portion has a connection portion that connects an interior of the first recessed portion and an interior of the second recessed portion. (14) The pump according to any one of (1) to (13), wherein the partition portion has a rib provided on at least one of the first partition wall and the second partition wall. (15) The pump according to (14), wherein the rib includes a first rib provided on a portion of the partition portion facing the interior of the rotor housing portion. (16) The pump according to (14) or (15), wherein the rib includes a second rib provided on a portion of the partition portion facing the interior of the substrate housing portion, the second rib being in contact with the heat conduction member. (17) The pump according to (16), wherein the second rib is provided only on the first partition wall of the first partition wall and the second partition wall.

[0093] The structures and methods described in this specification can be appropriately combined within the range not contradicting each other. Explanation of symbols

[0094] 10…rotor, 15…bearing portion, 15a…first groove portion, 15b…second groove portion, 20…stator, 30…fixed shaft, 40…pump portion, 50…housing, 64…rotor housing portion, 65…substrate housing portion, 65a…second peripheral wall portion (peripheral wall portion), 66, 66a, 66b…first rib, 67…second rib, 69, 269…partition portion, 69a…first partition wall, 69b…second partition wall, 69c…shaft holding portion, 69g…first recessed portion, 69h…second recessed portion, 95…substrate, 96…electronic component, 96a…first electronic component, 96b…second electronic component, 100, 200…pump, 120…heat conducting component, 269m…connecting portion, J…center axis line.

Claims

1. A pump, characterized in that: have: A rotor rotatable about a central axis; a stator, the stator being radially opposite to the rotor with a gap therebetween; a pump portion connected to one axial side of the rotor; a housing having a rotor housing portion for housing the rotor therein; a substrate housed inside the housing; as well as a plurality of electronic components mounted on the substrate, The housing has: a substrate receiving portion, the substrate receiving portion being located at the other axial side of the rotor receiving portion and receiving the substrate therein; as well as a partition portion that separates the interior of the rotor housing portion from the interior of the substrate housing portion, The partition portion includes a first partition wall and a second partition wall that separate the interior of the rotor housing portion from the interior of the substrate housing portion in the axial direction. The second partition wall is located axially closer to one side than the first partition wall. The plurality of electronic components include: a first electronic component; as well as a second electronic component, the axial dimension of the second electronic component being larger than the axial dimension of the first electronic component, the second electronic component being mounted on one axial side surface of the substrate, The second electronic component overlaps with the second partition wall when viewed in the axial direction, A heat conducting member in contact with the partition and the substrate is provided between the partition and the substrate.

2. The pump according to claim 1, characterized in that The thermally conductive component is formed by a heat dissipation gap filler.

3. The pump according to claim 1, characterized in that The second electronic component is in contact with the heat conductive member.

4. The pump according to claim 1, characterized in that The first electronic component overlaps with the first partition wall when viewed in the axial direction.

5. The pump according to claim 1, characterized in that A fixed shaft is provided, the fixed shaft extending in the axial direction and rotatably supporting the rotor, The partition portion includes a shaft holding portion that holds the other axial end portion of the fixed shaft. The first partition wall and the second partition wall are located radially outside the shaft holding portion and have circumferential positions different from each other.

6. The pump according to claim 5, characterized in that The second partition wall is located on one side in the axial direction relative to the end portion on the other side in the axial direction of the shaft holding portion.

7. The pump according to claim 6, characterized in that An end portion of the second electronic component on one axial side is located axially toward one side relative to an end portion of the shaft holding portion on the other axial side and is located radially outward of the shaft holding portion.

8. The pump according to claim 5, characterized in that The first partition wall is located in the axial direction at the same position as the end portion on the other axial side of the shaft holding portion, or is located closer to the other axial side than the end portion on the other axial side of the shaft holding portion.

9. The pump according to claim 5, characterized in that The rotor has a cylindrical bearing portion through which the fixed shaft passes in the axial direction. The inner surface of the bearing portion is provided with a first groove portion opened on both sides in the axial direction.

10. The pump according to claim 9, characterized in that A second groove portion extending from the inner peripheral surface of the bearing portion to the outer peripheral surface of the bearing portion is provided on an end surface on one axial side of the bearing portion. The interior of the second groove is directly or indirectly connected to the interior of the first groove.

11. The pump according to claim 1, characterized in that The substrate storage portion has a peripheral wall portion surrounding the substrate around the central axis. An axial thickness of the first partition wall and an axial thickness of the second partition wall are smaller than a radial thickness of the peripheral wall portion.

12. A pump according to any one of claims 1 to 11, characterized in that The partition portion includes a first recessed portion and a second recessed portion which are recessed toward the other axial side and open at one axial side. The first partition wall constitutes a wall portion on the other axial side of the first recess. The second partition wall constitutes a wall portion on the other axial side of the second recess.

13. The pump according to claim 12, characterized in that The partition portion includes a connection portion that connects the interior of the first recessed portion and the interior of the second recessed portion.

14. A pump according to any one of claims 1 to 11, characterized in that The partition portion has a rib provided on at least one of the first partition wall and the second partition wall.

15. The pump according to claim 14, characterized in that The ribs include a first rib provided on a portion of the partition portion facing the interior of the rotor housing portion.

16. The pump according to claim 14, characterized in that The rib includes a second rib provided on a portion of the partition portion facing the interior of the substrate storage portion, The second rib is in contact with the heat conductive member.

17. The pump according to claim 16, characterized in that The second rib is provided only on the first partition wall of the first partition wall and the second partition wall.

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