Pump device

Abstract

A pump device is provided with: a rotor (4) that rotates about a rotation axis (L); a fulcrum shaft (5) that rotatably supports the rotor; and an impeller (8) connected to the rotor on one side of the rotor in the axial direction along the rotation axis. The rotor is provided with: a radial bearing (9) through which the fulcrum shaft is inserted on the inner circumferential side; a cylindrical portion (40) that holds the radial bearing on the inside; and a magnet held on the outside of the cylindrical portion. The cylindrical portion is a resin molded article in which the radial bearing is insert-molded, and is provided with a through hole (49) penetrating the cylindrical portion in the axial direction between the radial bearing and the magnet. The radial bearing is provided with: a cylindrical main body section (91) into which the fulcrum shaft is inserted; and a flange section (92) that protrudes from the main body section to the outside in the radial direction centered on the rotation axis. The flange part is provided with a groove part (93) cut in the axial direction and a rotation stopping part (94) used for stopping the bearing from rotating relative to the cylindrical part.

Description

Technical Field

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

[0002] Patent Document 1 describes a pump device for circulating a fluid. The pump device of this document has: a rotor that rotates around a rotation axis; a shaft that supports the rotor so as to be rotatable; a stator disposed around the rotor; and an impeller connected to one side of the rotor. The rotor includes: a bearing through which a support shaft is inserted on the inner peripheral side; a cylindrical tubular portion that holds the bearing inside; and a magnet held on the outside of the tubular portion. Prior Art Documents Patent Documents

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-120568 Summary of the Invention

[0004] In the pump device of Patent Document 1, the tubular portion is a resin molded product in which a bearing is insert-molded. The bearing has a flange portion that protrudes radially. The flange portion sometimes has an anti-rotation portion for preventing the bearing from rotating relative to the tubular portion. For example, the anti-rotation portion is a plane facing radially outward.

[0005] In the pump device of Patent Document 1, in order to prevent foreign matter contained in the fluid from entering between the bearing and the support shaft, a through-hole is sometimes provided in the rotor. When viewed in the axial direction along the rotation axis, the through-hole is located radially outside the plane and penetrates the tubular portion in the axial direction between the bearing and the magnet.

[0006] When molding the tubular portion, with the bearing disposed inside the mold, a resin material flows into the mold. At this time, the bearing is inserted into a fixing pin provided inside the mold. In addition, a forming pin for forming the through-hole is disposed radially outside this plane. Here, inside the mold, the bearing is not positioned in the rotational direction relative to the fixing pin, and thus, when the resin material flows into the mold, the bearing sometimes rotates relative to the fixing pin. When the bearing rotates violently, the plane contacts the forming pin, and the forming pin may be deformed. If the forming pin is deformed, there is a problem that the through-hole cannot be formed as designed.

[0007] In view of the above problems, an object of the present invention is to provide a pump device that can form a through-hole as designed without the bearing rotating inside the mold even when a through-hole is provided in the tubular portion of a rotor in which a bearing is insert-molded.

[0008] In order to solve the above problems, the pump device of the present invention includes: a rotor that rotates about a rotation axis; a support shaft that supports the rotor so as to be rotatable; and an impeller that is connected to the rotor on one side in the axial direction of the rotor along the rotation axis. The rotor includes: a bearing through which the support shaft is inserted on the inner peripheral side; a cylindrical cylindrical portion that holds the bearing inside; and a magnet that is held outside the cylindrical portion. The cylindrical portion is a resin molded product in which the bearing is insert molded. The cylindrical portion has a through hole that penetrates the cylindrical portion in the axial direction between the bearing and the magnet. The bearing includes: a cylindrical main body portion into which the support shaft is inserted; and a flange portion that protrudes radially outward from the main body portion about the rotation axis. The flange portion includes: a groove portion that is cut in the axial direction; and an anti-rotation portion that stops the rotation of the bearing relative to the cylindrical portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a perspective view of a pump device according to an embodiment of the present invention. Figure 2 is Figure 1 a cross-sectional view of the pump device shown. Figure 3 is an exploded perspective view of the impeller, rotor, and support shaft. Figure 4 is a longitudinal cross-sectional view of the rotor and impeller. Figure 5 is an exploded perspective view of the rotor with the magnet disassembled as viewed from one side. Figure 6 is an exploded perspective view of the rotor with the magnet disassembled as viewed from the other side. Figure 7 is a perspective view of the rotor as viewed from one side. Figure 8 is a perspective view of the radial bearing. Figure 9 is a top view of the radial bearing as viewed from one side. Figure 10 is Figure 7 an A-A cross-sectional view of the rotor of. Figure 11 is a schematic cross-sectional view of the mold when forming the cylindrical portion. Figure 12 is a schematic perspective view showing the state when the radial bearing is set on the mold. DETAILED DESCRIPTION

[0010] (Overall Structure) Figure 1 is a perspective view of a pump device 100 according to an embodiment of the present invention.Figure 2 is Figure 1 a cross-sectional view of the pump device 100 shown in Figure 3 is an exploded perspective view of the impeller 8, the rotor 4, and the support shaft 5. In Figure 1 and Figure 2 , the pump device 100 has: a housing 2; a motor 10 disposed on the other side L2 in the axial direction with respect to the housing 2; and an impeller 8 disposed in a pump chamber 20 inside the housing 2. The impeller 8 is driven by the motor 10 to rotate about a rotation axis L. The motor 10 includes a cylindrical stator 3, a rotor 4 disposed inside the stator 3, a resin outer shell 6 covering the stator 3, and a rod-shaped support shaft 5 that supports the rotor 4 so as to be rotatable. The support shaft 5 is made of metal or ceramic. In the pump device 100 of the present embodiment, the fluid is a liquid, and the pump device 100 is used as a vehicle-mounted pump in which the ambient temperature and the fluid temperature are likely to change.

[0011] The housing 2 is fixed to one side L1 of the motor 10 and divides the pump chamber 20 that houses the impeller 8. The housing 2 includes a suction pipe 21 that extends along the rotation axis L and a discharge pipe 22 that extends in a direction orthogonal to the rotation axis L. The suction pipe 21 has a suction port 211. The discharge pipe 22 has a discharge port 221. The suction pipe 21 is provided concentrically with respect to the rotation axis L.

[0012] The impeller 8 is made of resin. As Figure 2 and Figure 3 shown, a central hole 80 is formed in the central portion of the impeller 8. The impeller 8 includes a circular first plate 81, a plurality of blade portions 82 arranged at regular intervals in the circumferential direction, and a circular second plate 83. The blade portions 82 project from the second plate 83 toward the other side L2, and the front ends thereof abut against the first plate 81. When the impeller 8 rotates integrally with the rotor 4 about the rotation axis L by the drive of the motor 10, the fluid in the pump chamber 20 flows in the rotation direction through the blade portions 82. As a result, the fluid generates a centrifugal force, the radially inner side becomes a low pressure, and the radially outer side becomes a high pressure, and the fluid is sucked from the suction port 211 and discharged from the discharge port 221.

[0013] As Figure 2 shown, the stator 3 includes a stator core 31, an insulator 32 held by the stator core 31, and a coil 35 wound around the stator core 31 with the insulator 32 interposed therebetween.

[0014] As Figure 3 shown, the rotor 4 rotates about the rotation axis L. As Figure 2 and Figure 3As shown, the rotor 4 includes: a radial bearing 9 through which the support shaft 5 is inserted on the inner peripheral side; a cylindrical cylindrical portion 40 that holds the radial bearing 9 inside; and a magnet 15 that is held outside the cylindrical portion 40. The cylindrical portion 40 is a resin molded product in which the radial bearing 9 is insert molded. The cylindrical portion 40 opens into the pump chamber 20. A first plate 81 is formed at the end of the cylindrical portion 40 on one side L1 in the axial direction. The magnet 15 is a rare earth magnet.

[0015] In the present embodiment, the radial bearing 9 is made of resin. The resin used in the radial bearing 9 is a resin different from the resin used in the cylindrical portion 40 and has excellent wear resistance. The rotor 4 is rotatably supported on the support shaft 5 by the radial bearing 9. As Figure 2 shown, the first end 51 on the other side L2 in the axial direction of the support shaft 5 is held in the shaft hole 65 formed in the third partition wall 63 of the housing 6. A ring-shaped thrust bearing 12 is installed at the second end 52 of the support shaft 5. The thrust bearing 12 is a ring-shaped plate member. The thrust bearing 12 contacts one side L1 of the radial bearing 9 and supports the rotor 4 in the thrust direction. The thrust bearing 12 is disposed between the radial bearing 9 and the cylindrical portion 28 provided in the housing 2. Thereby, the movement of the thrust bearing 12 in the axial direction is restricted.

[0016] Here, at least a part of the first end 51 and the shaft hole 65 are formed in a cross-sectional D shape, and the second end 52 of the support shaft 5 and the hole of the thrust bearing 12 are formed in a cross-sectional D shape. Therefore, the rotation of the support shaft 5 and the thrust bearing 12 is prevented. In addition, the cross-section of the second end 52 of the support shaft 5 and the hole of the thrust bearing 12 may not be in the D shape but in a circular shape.

[0017] As Figure 1 and Figure 2 shown, the housing 6 divides the pump chamber 20 by covering the housing 2 from one side L1, and the housing 6 includes a partition wall 60 disposed between the rotor 4 and the stator 3 and a cylindrical main body portion 66 that covers the stator 3 from the radial outside. The partition wall 60 includes: a first partition wall 61 covered by the housing 2 from one side L1; a second partition wall 62 interposed between the stator 3 and the magnet 15; and a third partition wall 63 that closes the other side L2 of the second partition wall 62. The first partition wall 61 is a ring-shaped surface facing one side L1 and is opposed to the housing 2. The second partition wall 62 is cylindrical and extends from the central opening of the first partition wall 61 to the other side L2.

[0018] The housing 6 is composed of a resin sealing member 7 that covers the stator 3 from both radial sides and both axial sides. The resin sealing member 7 is a resin portion obtained by insert molding the stator 3 using polyphenylene sulfide (PPS: Polyphenylene Sulfide) or the like.

[0019] AsFigure 2 As shown, at the end 64 on the other side L2 in the axial direction of the outer shell 6, a cover 18 is fixed from the other side L2 of the rotation axis L. A circuit board 19 is disposed between the cover 18 and the third partition wall 63 of the outer shell 6, and the circuit board 19 is provided with a circuit for controlling the power supply to the coil 35 and the like.

[0020] (Details of the rotor) Figure 4 It is a longitudinal sectional view of the rotor 4 and the impeller 8. Figure 5 It is an exploded perspective view of the rotor 4 with the magnet 15 disassembled as viewed from one side L1. Figure 6 It is an exploded perspective view of the rotor 4 with the magnet 15 disassembled as viewed from the other side L2. Figure 7 It is a perspective view of the rotor 4 as viewed from one side L1. Figure 8 It is a perspective view of the radial bearing 9. Figure 9 It is a top view of the radial bearing 9 as viewed from one side L1. Figure 10 It is Figure 7 The A-A sectional view of the rotor 4 of

[0021] As Figures 4 to 7 As shown, the cylindrical portion 40 includes: a first cylindrical portion 41 connected to the impeller 8; a second cylindrical portion 42 located on the other side L2 of the first cylindrical portion 41 and holding the magnet 15 on the outside; and a seat portion 43 that protrudes radially outward between the first cylindrical portion 41 and the second cylindrical portion 42 and supports the magnet 15 on one side L1.

[0022] The first cylindrical portion 41 and the second cylindrical portion 42 are cylindrical and coaxially arranged. The outer dimension of the first cylindrical portion 41 is larger than the outer diameter dimension of the second cylindrical portion 42. The first plate 81 protrudes radially outward from the end on one side of the first cylindrical portion 41.

[0023] A through hole 46 that penetrates radially is provided in the first cylindrical portion 41. A plurality of through holes 46 are provided at equal angles in the circumferential direction. In the present embodiment, two through holes 46 are provided in the circumferential direction.

[0024] As Figure 6 As shown, the seat portion 43 is formed with a convex portion 431 that fits into a concave portion 152 formed on the end 151 on one side L1 of the magnet 15. The convex portion 431 defines the angular position of the magnet 15 in the circumferential direction by being inserted into the concave portion 152 and prevents the rotation of the magnet 15. A riveting portion 421 that overlaps the magnet 15 is provided at the end on the other side L2 of the second cylindrical portion 42. The magnet 15 is fixed to the second cylindrical portion 42 by the riveting portion 421 in a state where it is pressed into the second cylindrical portion 42.

[0025] As Figure 4 、 Figure 6 andFigure 7 As shown, the cylindrical portion 40 has a through hole 49 that penetrates the cylindrical portion 40 in the axial direction between the radial bearing 9 and the magnet 15. Two or more through holes 49 are provided at equal intervals in the circumferential direction centered on the rotation axis L. In the present embodiment, two through holes 49 are provided at positions 180 degrees apart from each other in the circumferential direction. Through the through hole 49, the inside of the first cylindrical portion 41 communicates with the inside of the second cylindrical portion 42.

[0026] The radial bearing 9 is integrally formed with the cylindrical portion 40 by insert molding. As Figure 8 shown, the radial bearing 9 includes: a cylindrical main body portion 91 into which the support shaft 5 is inserted; a flange portion 92 that protrudes from the main body portion 91 to the outside in the radial direction centered on the rotation axis L; and a gate mark 98 that is formed on the outer peripheral surface of the flange portion 92. The gate mark 98 is formed on the flange portion 92 when the radial bearing 9 is manufactured by resin molding.

[0027] As Figure 4 and Figure 8 shown, the main body portion 91 includes a cylindrical first portion 96 located on one side L1 and a cylindrical second portion 97 located on the other side L2 of the first portion 96. As Figure 4 shown, the outer diameter dimension of the first portion 96 is larger than the outer diameter dimension of the second portion 97.

[0028] As Figure 4 and Figure 7 shown, one side L1 of the first portion 96 protrudes from the annular surface portion 48 to one side L1, and the first end surface 911 of one side L1 of the first portion 96 is exposed from the cylindrical portion 40. The first end surface 911 contacts the thrust bearing 12.

[0029] As Figure 4 and Figure 8 shown, the flange portion 92 is provided between the first portion 96 and the second portion 97 in the axial direction. As Figure 4 shown, the flange portion 92 contacts the first step portion 471 and the second step portion 472 formed inside the cylindrical portion 40. Thereby, the movement of the radial bearing 9 relative to the cylindrical portion 40 in the axial direction is restricted.

[0030] As Figure 9 and Figure 10 shown, the flange portion 92 is polygonal when viewed from the axial direction. In the present embodiment, the polygon is a regular quadrilateral that is an integer multiple of the number 2 of the through holes 49. The flange portion 92 includes: a groove portion 93 formed by cutting the outer peripheral surface in the axial direction; and an anti-rotation portion 94 for preventing the radial bearing 9 from rotating relative to the cylindrical portion 40. The anti-rotation portion 94 is a plane 95 orthogonal to the radial direction. The plane 95 is a surface that forms the side of the regular quadrilateral and is provided in four numbers.

[0031] The groove portions 93 are provided at all the corner portions 99 of the regular quadrangle. Further, in the present embodiment, the corner portions 99 are chamfered. As Figure 10 shown, when viewed from the axial direction, a part of the through hole 49 is located inside the groove portion 93. In the present embodiment, half of the radially inner side of the through hole 49 is located inside the groove portion 93.

[0032] (Forming of the cylindrical portion) Figure 11 is a schematic cross-sectional view of the mold 70 when forming the cylindrical portion 40. Figure 12 is a schematic perspective view showing a state when the radial bearing 9 is set on the mold 70.

[0033] As Figure 11 and Figure 12 shown, on the mold 70, there are provided fixing pins 71 for holding the radial bearing 9 and anti-rotation pins 72 for preventing the radial bearing 9 from rotating relative to the fixing pins 71. The two anti-rotation pins 72 are provided at equal intervals in the circumferential direction centered on the fixing pin 71.

[0034] When forming the cylindrical portion 40, the radial bearing 9 is inserted into the fixing pin 71 and arranged in the mold 70. At this time, as Figure 12 shown, the radial bearing 9 is arranged such that the two anti-rotation pins 72 are in the same position as the groove portion 93. Here, since the groove portions 93 are provided at all the corner portions 99 of the flange portion 92 of the regular quadrangle, when arranging the radial bearing 9 in the mold 70, it is easy to make the positions of the anti-rotation pins 72 and the groove portion 93 coincide.

[0035] After arranging the radial bearing 9 in the mold 70, the resin sealing member 7 flows into the mold 70. Thus, a cylindrical portion 40 in which the radial bearing 9 is insert-molded is formed. At this time, the anti-rotation pins 72 are used to prevent the radial bearing 9 from rotating by the resin sealing member 7 flowing into the mold 70 and to form the through hole 49. Thus, a part of the formed through hole 49 becomes the position inside the groove portion 93 when viewed from the axial direction.

[0036] (Function and effect) The pump device 100 of the present embodiment includes: a rotor 4 that rotates about a rotation axis L; a support shaft 5 that supports the rotor 4 so as to be rotatable; and an impeller 8 that is connected to the rotor 4 on one side L1 in the axial direction of the rotor 4 along the rotation axis L. The rotor 4 includes: a radial bearing 9 through which the support shaft 5 is inserted on the inner peripheral side; a cylindrical tubular portion 40 that holds the radial bearing 9 inside; and a magnet 15 that is held outside the tubular portion 40. The tubular portion 40 is a resin molded product in which the radial bearing 9 is insert-molded, and a through hole 49 that penetrates the tubular portion 40 in the axial direction is provided between the radial bearing 9 and the magnet 15. The radial bearing 9 includes: a cylindrical main body portion 91 into which the support shaft 5 is inserted; and a flange portion 92 that protrudes radially outward from the main body portion 91 about the rotation axis L. The flange portion 92 includes a groove portion 93 that is cut in the axial direction and a rotation prevention portion 94 for preventing the bearing from rotating relative to the tubular portion 40.

[0037] According to the present embodiment, since the radial bearing 9 includes the groove portion 93, if a rotation prevention pin 72 that engages with the groove portion 93 of the radial bearing 9 is provided on the mold 70 for molding the tubular portion 40, the radial bearing 9 will not rotate within the mold when the radial bearing 9 is inserted and the tubular portion 40 is molded. Therefore, the radial bearing 9 will not rotate and cause the rotation prevention portion 94 to contact the molding pin for forming the through hole 49, and thus the through hole 49 can be formed according to the design.

[0038] The rotation prevention portion 94 is a plane 95 that is orthogonal to the radial direction. Thereby, rotation of the radial bearing 9 relative to the tubular portion 40 can be suppressed by a simple structure.

[0039] The flange portion 92 is polygonal when viewed from the axial direction, and the plane 95 is a surface that forms a side of the polygon. Therefore, since a plurality of planes 95 are provided, rotation of the radial bearing 9 relative to the tubular portion 40 can be further suppressed.

[0040] Two or more through holes 49 are provided at equal intervals in the circumferential direction about the rotation axis L. The polygon is a regular polygon that is an integer multiple of the number of through holes 49. The groove portion 93 is provided at all corners 99 of the polygon. When viewed from the axial direction, a part of the through hole 49 is located inside the groove portion 9-three. Thereby, the rotation prevention pin 72 that engages with the groove portion 93 can be used as a pin for forming the through hole 49, and thus the structure of the mold 70 for molding the tubular portion 40 can be simplified. In addition, since the groove portion 93 is provided as an integer multiple of the number of two or more through holes 49, it is easy to align the position of the rotation prevention pin 72 with the groove portion 93 when the radial bearing 9 is disposed within the mold 70.

[0041] The polygon of the flange portion 92 is a regular quadrilateral. Thus, when viewed in the axial direction, the area of the flange portion 92 can be reduced compared to the case where the polygon of the flange portion 92 is a polygon larger than a regular quadrilateral. As a result, the component cost of the radial bearing 9 can be reduced.

[0042] The radial bearing 9 is made of resin and has a gate mark 98 on the outer peripheral surface of the flange portion 92. Therefore, when forming the radial bearing 9, the resin easily flows in the axial direction within the mold for forming the radial bearing 9, and thus the cylindricity of the radial bearing 9 can be improved.

[0043] The main body portion 91 includes a cylindrical first portion 96 located on one side L1 and a cylindrical second portion 97 located on the other side L2 in the axial direction of the first portion 96. The outer diameter dimension of the first portion 96 is larger than the outer diameter dimension of the second portion 97. The first end surface 911 on the one side L1 of the first portion 96 is exposed from the cylindrical portion 40 and contacts the thrust bearing 12 disposed on one side of the cylindrical portion 40. Here, in order to reduce the surface pressure when the first end surface 911 contacts the thrust bearing 12, it is preferable that the area of the first end surface 911 is large. Therefore, the outer diameter dimension of the first portion 96 forming the first end surface 911 is larger than the outer diameter dimension of the second portion 97, and thus the surface pressure when the first end surface 911 contacts the thrust bearing 12 can be reduced, and the component cost of the radial bearing 9 can be reduced compared to the case where the outer diameter dimensions of the first portion 96 and the second portion 97 are the same.

[0044] The flange portion 92 is provided between the first portion 96 and the second portion 97 in the axial direction. Thus, compared to the case where the flange portion 92 is provided in the middle portion of the first portion 96 or the second portion 97, when forming the radial bearing 9, the resin easily flows in the axial direction within the mold for forming the radial bearing 9, and thus the cylindricity of the radial bearing 9 can be improved.

[0045] (Other modification examples) In the above-described embodiment, the radial bearing 9 is made of resin, but is not limited to resin. The radial bearing 9 can be made of metal. In this case, the radial bearing 9 can be formed by sintered metal.

[0046] In the above-described embodiment, the polygon of the flange portion 92 is a regular quadrilateral, but it can also be a polygon larger than a regular quadrilateral. For example, if there are two through holes 49, the polygon of the flange portion 92 can be a regular hexagon or a regular octagon, etc.

[0047] In the above-described embodiment, two through holes 49 are provided, but three or more can also be provided. For example, if there are three through holes 49, the polygon of the flange portion 92 can be an equilateral triangle or a hexagon, etc.

[0048] In the above-described embodiment, the polygon of the flange portion 92 is a regular polygon, but the polygon of the flange portion 92 may not be a regular polygon.

[0049] In the above-described embodiment, the groove portion 93 is provided at all the corner portions 93, but the groove portion 93 may not be provided at all the corner portions 93.

[0050] Note that the present technology may adopt the following configuration.

[0051] (1) A pump device including: a rotor that rotates about a rotation axis; a support shaft that supports the rotor so as to be rotatable; and an impeller that is connected to the rotor on one side in the axial direction of the rotor along the rotation axis, wherein the rotor includes: a bearing through which the support shaft is inserted on the inner peripheral side; a cylindrical cylindrical portion that holds the bearing inside; and a magnet that is held outside the cylindrical portion, the cylindrical portion is a resin molded product in which the bearing is insert-molded, and a through hole that penetrates the cylindrical portion in the axial direction is provided between the bearing and the magnet, the bearing includes: a cylindrical main body portion into which the support shaft is inserted; and a flange portion that projects radially outward from the main body portion about the rotation axis, the flange portion includes: a groove portion that is cut in the axial direction; and a rotation stop portion for stopping the rotation of the bearing relative to the cylindrical portion.

[0052] Accordingly, if a rotation stop pin that engages with the groove portion of the bearing is provided in the mold for molding the cylindrical portion, the bearing does not rotate in the mold when the bearing is inserted and the cylindrical portion is molded, and thus it is possible to prevent the rotation stop portion from contacting the molding pin for forming the through hole due to the rotation of the bearing.

[0053] (2) In the pump device according to (1), the rotation stop portion is a plane orthogonal to the radial direction.

[0054] Accordingly, it is possible to prevent the rotation of the bearing relative to the cylindrical portion with a simple structure.

[0055] (3) In the pump device according to (2), the flange portion is a polygon when viewed in the axial direction, the plane is a surface that forms a side of the polygon.

[0056] Accordingly, since a plurality of planes are provided, it is possible to further prevent the rotation of the bearing relative to the cylindrical portion.

[0057] (4) In the pump device described in (3), Two or more through holes are provided at equal intervals in the circumferential direction centered on the rotation axis, The polygon is a regular polygon that is an integer multiple of the number of the through holes, The groove portions are provided at all corners of the polygon, When viewed from the axial direction, a part of the through hole is located inside the groove portion.

[0058] Thus, the rotation prevention pin engaged with the groove portion can be used as the pin for forming the through hole, so that the structure of the mold for forming the cylindrical portion can be simplified. In addition, since the groove portions are provided in an integer multiple with respect to the number of two or more through holes provided, it is easy to align the positions of the rotation prevention pins and the groove portions when the bearing is arranged in the mold.

[0059] (5) In the pump device described in (3) or (4), the polygon is a quadrilateral.

[0060] Thus, when viewed from the axial direction, compared with the case where the polygon of the flange portion is a polygon larger than a quadrilateral, the area of the flange portion can be reduced, so that the component cost of the bearing can be reduced.

[0061] (6) In the pump device according to any one of (1) to (5), The bearing is made of resin and has a gate mark on the outer peripheral surface of the flange portion.

[0062] Thus, when forming the bearing, the resin easily flows in the axial direction in the mold for forming the bearing, so that the cylindricity of the bearing can be improved.

[0063] (7) In the pump device according to any one of (1) to (6), The main body portion includes: a cylindrical first portion located on the one side; and a cylindrical second portion located on the other side in the axial direction of the first portion, The outer diameter dimension of the first portion is larger than the outer diameter dimension of the second portion, The first end surface on the one side of the first portion is exposed from the cylindrical portion and contacts the thrust bearing arranged on the one side of the cylindrical portion.

[0064] Thus, the outer diameter dimension of the first portion forming the first end surface is larger than the outer diameter dimension of the second portion, so that the surface pressure when the first end surface contacts the thrust bearing can be reduced, and the component cost of the bearing can be reduced compared with the case where the outer diameter dimensions of the first portion and the second portion are the same.

[0065] (8) In the pump device described in (7), The flange portion is disposed between the first portion and the second portion in the axial direction.

[0066] Thus, compared with the case where the flange portion is disposed in the middle portion of the first portion or the second portion, when forming the bearing, the resin easily flows in the mold of the formed bearing in the axial direction, so that the cylindricity of the bearing can be improved. Symbolic Explanation

[0067] 100... pump device, 2... housing, 3... stator, 4... rotor, 5... support shaft, 6... outer casing, 7... resin seal member, 8... impeller, 9... radial bearing, 10... motor, 12... thrust bearing, 15... magnet, 18... cover, 19... circuit board, 20... pump chamber, 21... suction pipe, 22... discharge pipe, 28... cylindrical portion, 31... stator core, 32... insulator, 35... coil, 40... cylindrical portion, 41... first cylindrical portion, 42... second cylindrical portion, 43... seat portion, 46... through hole, 48... annular surface portion, 49... through hole, 51... first end portion, 52... second end portion, 60... partition wall, 61... first partition wall, 62... second partition wall, 63... third partition wall, 64... end portion, 65... shaft hole, 66... main body portion, 70... mold, 71... fixing pin, 72... anti-rotation pin, 80... central hole, 81... first plate, 82... blade portion, 83... second plate, 91... main body portion, 92... flange portion, 93... groove portion, 94... anti-rotation portion, 95... flat surface, 96... first portion, 97... second portion, 98... gate mark, 99... corner portion, 151... end portion, 152... recess, 211... suction port, 221... discharge port, 421... riveted portion, 431... convex portion, 471... first step portion, 472... second step portion, 911... first end face, L... rotation axis, L1... one side, L2... the other side.

Claims

1. A pump device, characterized in that, Comprising: A rotor that rotates about a rotation axis; A support shaft that supports the rotor so as to be rotatable; and An impeller that is connected to the rotor on one side in the axial direction of the rotor along the rotation axis, The rotor includes: a bearing through which the support shaft is inserted on the inner peripheral side; a cylindrical cylindrical portion that holds the bearing inside; and a magnet that is held outside the cylindrical portion, The cylindrical portion is a resin molded product in which the bearing is insert molded, and has a through hole that penetrates the cylindrical portion in the axial direction between the bearing and the magnet, The bearing includes: a cylindrical main body portion into which the support shaft is inserted; and a flange portion that protrudes radially outward from the main body portion about the rotation axis, The flange portion includes: a groove portion formed by cutting in the axial direction; and a rotation stopping portion for stopping the rotation of the bearing relative to the cylindrical portion.

2. The pump device according to claim 1, wherein The rotation stopping portion is a plane orthogonal to the radial direction.

3. The pump device according to claim 2, wherein The flange portion is polygonal when viewed from the axial direction, The plane is a surface that forms a side of the polygon.

4. The pump device according to claim 3, wherein Two or more through holes are provided at equal intervals in the circumferential direction about the rotation axis, The polygon is a regular polygon that is an integer multiple of the number of the through holes, The groove portion is provided at all corners of the polygon, When viewed from the axial direction, a part of the through hole is located inside the groove portion.

5. The pump device according to claim 3 or 4, wherein The polygon is a quadrilateral.

6. The pump device according to claim 1, wherein The bearing is made of resin and has a gate mark on the outer peripheral surface of the flange portion.

7. The pump device according to claim 1, wherein The main body portion includes: a cylindrical first portion on the one side; and a cylindrical second portion on the other side in the axial direction of the first portion, The outer diameter dimension of the first portion is larger than the outer diameter dimension of the second portion, The first end surface on the one side of the first portion is exposed from the cylindrical portion and contacts a thrust bearing disposed on the one side of the cylindrical portion.

8. The pump device according to claim 7, wherein The flange portion is provided between the first portion and the second portion in the axial direction.

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