Pump device

Abstract

To provide a pump device in which even if a through hole is provided in a cylinder part of a rotor in which a bearing is insert-molded, the through hole can be formed as designed.SOLUTION: A rotor 4 comprises a radial bearing 9 into which a supporting shaft is inserted on an inner peripheral side, a tubular cylinder part 40 holding the radial bearing 9 inside, and a magnet 15 held outside the cylinder part 40. The cylinder part 40 is a resin molded article in which the radial bearing 9 is insert-molded, and comprises a through hole 49 penetrating the cylinder part 40 in an axial direction between the radial bearing 9 and the magnet 15. The radial bearing 9 comprises a cylindrical main body part 91 into which the supporting shaft is inserted inside, and a flange part 92 protruding outward in a radial direction around a rotation axis L from the main body part 91. The flange part 92 comprises a groove part notched in the axial direction, and a rotation prevention part for stopping rotation of the bearing with respect to the cylinder part 40.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] A pump device for circulating a fluid is described in Patent Document 1. The pump device in this document has a rotor that rotates about a rotation axis, a shaft that rotatably supports the rotor, a stator arranged around the rotor, and an impeller connected to one side of the rotor. The rotor has a bearing through which a support shaft is inserted at its inner periphery, a cylindrical portion that holds the bearing inside, and a magnet held on the outside of the cylindrical portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-120568 Summary of the Invention [Problem to be solved by the invention]

[0004] In the pump device of Patent Document 1, the cylindrical portion is a resin molded part in which a bearing is insert-molded. The bearing has a flange portion that protrudes in the radial direction. The flange portion may be provided with a rotation prevention portion to stop the bearing from rotating relative to the cylindrical portion. For example, the rotation prevention portion is a flat surface that faces radially outward.

[0005] In the pump device of Patent Document 1, the rotor may be provided with a through-hole to prevent foreign matter contained in the fluid from penetrating between the bearing and the support shaft. When viewed from the axial direction along the rotation axis, the through-hole is located at a position radially outward of the plane, and penetrates the cylindrical portion in the axial direction between the bearing and the magnet.

[0006] When molding a cylindrical portion, a resin material is poured into a mold with a bearing placed inside the mold. At this time, the bearing is inserted into a fixed pin provided inside the mold. In addition, a forming pin for forming a through hole is placed radially outward of the flat surface. Here, inside the mold, the bearing is not positioned in the rotational direction relative to the fixed pin, so when the resin material flows into the mold, the bearing may rotate relative to the fixed pin. If the bearing rotates forcefully, the flat surface may come into contact with the forming pin, causing the forming pin to deform. If the forming pin deforms, 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 in which, even when a through hole is provided in the cylindrical portion of a rotor into which a bearing is insert-molded, the bearing does not rotate within the mold during molding, and the through hole can be formed as designed. [Means for solving the problem]

[0008] In order to solve the above problems, a pump device of the present invention includes a rotor that rotates about a rotation axis, a support shaft that rotatably supports the rotor, and an impeller connected to the rotor on one side in an axial direction along the rotation axis of the rotor, wherein the rotor includes a bearing into which the support shaft is inserted at its inner periphery, a cylindrical portion that holds the bearing inside, and a magnet that is held on the outside of the cylindrical portion, the cylindrical portion being a resin molded product into which the bearing is insert-molded and including a through-hole that passes through the cylindrical portion in the axial direction between the bearing and the magnet, and the bearing includes a cylindrical main body portion into which the support shaft is inserted, and a flange portion that protrudes from the main body portion radially outward about the rotation axis, and the flange The flange portion is characterized by including a groove portion cut out in the axial direction and a rotation prevention portion for stopping rotation of the bearing relative to the cylindrical portion. [Brief explanation of the drawings]

[0009] [Figure 1]FIG. 1 is a perspective view of a pump device according to one embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of the pump device shown in FIG. [Figure 3] FIG. 3 is an exploded perspective view of the impeller, rotor, and support shaft. [Figure 4] FIG. 4 is a longitudinal cross-sectional view of the rotor and impeller. [Figure 5] FIG. 5 is an exploded perspective view of the rotor from one side with the magnets disassembled. [Figure 6] FIG. 6 is an exploded perspective view of the rotor from the other side, with the magnets disassembled. [Figure 7] FIG. 7 is a perspective view of the rotor as seen from one side. [Figure 8] FIG. 8 is a perspective view of a radial bearing. [Figure 9] FIG. 9 is a plan view of the radial bearing as seen from one side. [Figure 10] FIG. 10 is a cross-sectional view of the rotor of FIG. 7 taken along line AA. [Figure 11] FIG. 11 is a schematic cross-sectional view of a mold used to form the cylindrical portion. [Figure 12] FIG. 12 is a schematic perspective view showing a state in which the radial bearing is installed in a mold. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Overall composition) FIG. 1 is a perspective view of a pump device 100 according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of the pump device 100 shown in FIG. 1. FIG. 3 is an exploded perspective view of an impeller 8, a rotor 4, and a support shaft 5. In FIGS. 1 and 2, the pump device 100 includes a case 2, a motor 10 disposed on the other axial side L2 of the case 2, and an impeller 8 disposed in a pump chamber 20 inside the case 2. The impeller 8 is driven to rotate about a rotation axis L by the motor 10. The motor 10 includes a cylindrical stator 3, a rotor 4 disposed inside the stator 3, a resin housing 6 that covers the stator 3, and a round rod-shaped support shaft 5 that rotatably supports the rotor 4. The support shaft 5 is made of metal or ceramic. In the pump device 100 of this embodiment, the fluid is a liquid, and the pump device 100 is used as an in-vehicle pump where the ambient temperature and fluid temperature are prone to change.

[0011] Case 2 is fixed to one side L1 of motor 10 and defines pump chamber 20 that houses impeller 8. Case 2 includes suction pipe 21 extending along rotation axis L and discharge pipe 22 extending in a direction perpendicular to rotation axis L. Suction pipe 21 includes a suction port 211. Discharge pipe 22 includes a discharge port 221. Suction pipe 21 is provided concentrically with respect to rotation axis L.

[0012] The impeller 8 is made of resin. As shown in FIGS. 2 and 3 , a central hole 80 is formed in the center of the impeller 8. The impeller 8 includes a circular first plate 81, a plurality of blades 82 arranged at regular intervals in the circumferential direction, and a circular second plate 83. The blades 82 protrude from the second plate 83 on the other side L2, and their tips abut against the first plate 81. When the impeller 8 rotates integrally with the rotor 4 about the rotation axis L by driving the motor 10, the blades 82 cause the fluid in the pump chamber 20 to flow in the rotational direction. As a result, centrifugal force is generated in the fluid, causing low pressure on the radially inner side and high pressure on the radially outer side, and the fluid is sucked in through the intake port 211 and discharged through the discharge port 221.

[0013] As shown in FIG. 2, 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 shown in FIG. 3, the rotor 4 rotates around a rotation axis L. As shown in FIGS. 2 and 3, the rotor 4 includes a radial bearing 9 through which the support shaft 5 is inserted at its inner periphery, a cylindrical portion 40 that holds the radial bearing 9 inside, and a magnet 15 held on the outside of the cylindrical portion 40. The cylindrical portion 40 is a resin molded product into which the radial bearing 9 is insert-molded. The cylindrical portion 40 opens to 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 this embodiment, the radial bearing 9 is made of resin. The resin used in the radial bearing 9 is 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 via the radial bearing 9. As shown in FIG. 2 , a first end 51 on the other axial side L2 of the support shaft 5 is held in a shaft hole 65 formed in a third partition wall portion 63 of the housing 6. An annular thrust bearing 12 is attached to a second end 52 of the support shaft 5. The thrust bearing 12 is an annular plate member. The thrust bearing 12 contacts one side L1 of the radial bearing 9 to support the rotor 4 in the thrust direction. The thrust bearing 12 is disposed between the radial bearing 9 and a cylindrical portion 28 provided in the case 2. This restricts the thrust bearing 12 from moving in the axial direction.

[0016] Here, at least a portion of the first end 51 and the shaft hole 65 is formed to have a D-shaped cross section, and the second end 52 of the support shaft 5 and the hole of the thrust bearing 12 are also formed to have a D-shaped cross section. This prevents the support shaft 5 and the thrust bearing 12 from rotating. Note that the second end 52 of the support shaft 5 and the hole of the thrust bearing 12 may have a circular cross section instead of a D-shaped cross section.

[0017] 1 and 2, the housing 6 is covered from one side L1 with the case 2 to define the pump chamber 20, and includes a partition wall portion 60 disposed between the rotor 4 and the stator 3, and a cylindrical body portion 66 that covers the stator 3 from the radially outer side. The partition wall portion 60 includes a first partition wall portion 61 covered from one side L1 with the case 2, a second partition wall portion 62 interposed between the stator 3 and the magnet 15, and a third partition wall portion 63 that closes the other side L2 of the second partition wall portion 62. The first partition wall portion 61 is an annular surface portion facing the one side L1 and faces the case 2. The second partition wall portion 62 is cylindrical and extends from a central opening of the first partition wall portion 61 to the other side L2.

[0018] The housing 6 is made up of a resin sealing member 7 that covers both radial and axial sides of the stator 3. The resin sealing member 7 is a resin portion formed when the stator 3 is insert-molded using polyphenylene sulfide (PPS) or the like.

[0019] 2, a cover 18 is fixed to an end portion 64 on the other axial side L2 of the housing 6 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 portion 63 of the housing 6, on which a circuit for controlling power supply to the coil 35 and the like are provided.

[0020] (Rotor details) FIG. 4 is a longitudinal cross-sectional view of the rotor 4 and impeller 8. FIG. 5 is an exploded perspective view of the rotor 4 from one side L1, with the magnets 15 disassembled. FIG. 6 is an exploded perspective view of the rotor 4 from the other side L2, with the magnets 15 disassembled. FIG. 7 is a perspective view of the rotor 4 from one side L1. FIG. 8 is a perspective view of the radial bearing 9. FIG. 9 is a plan view of the radial bearing 9 from one side L1. FIG. 10 is a cross-sectional view of the rotor 4 of FIG. 7 cut along line AA.

[0021] As shown in FIGS. 4 to 7, the cylindrical portion 40 includes a first cylindrical portion 41 to which the impeller 8 is connected, 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 second cylindrical portion 42 protruding radially outward between the first cylindrical portion 41 and the second cylindrical portion 42 and holding the magnet 15 on the outside. and a seat portion 43 that supports one side L1 of the base 5.

[0022] The first cylindrical portion 41 and the second cylindrical portion 42 are cylindrical and are arranged coaxially. 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 one end of the first cylindrical portion 41.

[0023] The first cylindrical portion 41 is provided with through holes 46 that penetrate in the radial direction. A plurality of through holes 46 are provided at equal angles in the circumferential direction. In this embodiment, two through holes 46 are provided in the circumferential direction.

[0024] As shown in Fig. 6, the seat 43 is formed with a protrusion 431 that fits into a recess 152 formed in an end 151 on one side L1 of the magnet 15. By fitting into the recess 152, the protrusion 431 determines the angular position of the magnet 15 in the circumferential direction and prevents rotation of the magnet 15. A crimped portion 421 that overlaps the magnet 15 is provided at the end of the other side L2 of the second cylindrical portion 42. The magnet 15 is press-fitted into the second cylindrical portion 42 and fixed to the second cylindrical portion 42 by the crimped portion 421.

[0025] As shown in Figures 4, 6, and 7, the cylindrical portion 40 has a through hole 49 that passes through 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 around the rotation axis L. In this embodiment, two through holes 49 are provided at positions 180 degrees apart from each other in the circumferential direction. The through hole 49 connects the interior of the first cylindrical portion 41 and the interior of the second cylindrical portion 42.

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

[0027] 4 and 8, the main body 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 shown in FIG. 4, the outer diameter of the first portion 96 is larger than the outer diameter of the second portion 97.

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

[0029] 4 and 8, the flange portion 92 is provided between the first portion 96 and the second portion 97 in the axial direction. As shown in FIG. 4, the flange portion 92 contacts a first step portion 471 and a second step portion 472 formed inside the cylindrical portion 40. This restricts the radial bearing 9 from moving in the axial direction relative to the cylindrical portion 40.

[0030] 9 and 10, the flange portion 92 has a polygonal shape when viewed from the axial direction. In this embodiment, the polygonal shape is a regular rectangle that is an integer multiple of two times the number of through holes 49. The flange portion 92 includes grooves 93 cut out in the axial direction from the outer circumferential surface, and rotation prevention portions 94 for preventing rotation of the radial bearing 9 relative to the cylindrical portion 40. The rotation prevention portions 94 are flat surfaces 95 that are perpendicular to the radial direction. The flat surfaces 95 are faces that form the sides of a regular rectangle, and four flat surfaces 95 are provided.

[0031] The grooves 93 are provided at all corners 99 of the square. 10, a part of the through hole 49 is located inside the groove portion 93 when viewed from the axial direction. In this embodiment, the radially inner half of the through hole 49 is located inside the groove portion 93.

[0032] (Cylindrical part molding) Fig. 11 is a schematic cross-sectional view of the mold 70 when molding the cylindrical portion 40. Fig. 12 is a schematic perspective view showing the state when the radial bearing 9 is placed in the mold 70.

[0033] 11 and 12, the mold 70 is provided with a fixed pin 71 that holds the radial bearing 9, and an anti-rotation pin 72 that prevents the radial bearing 9 from rotating relative to the fixed pin 71. Two anti-rotation pins 72 are provided at equal intervals in the circumferential direction around the fixed pin 71.

[0034] When molding the cylindrical portion 40, the radial bearing 9 is inserted onto the fixing pins 71 and placed in the mold 70. At this time, as shown in Fig. 12, the radial bearing 9 is placed so that the positions of the two anti-rotation pins 72 and the grooves 93 are aligned. Here, grooves 93 are provided at all corners 99 of the regular square flange portion 92, so when placing the radial bearing 9 in the mold 70, it is easy to align the positions of the anti-rotation pins 72 and the grooves 93.

[0035] After the radial bearing 9 is placed in the mold 70, the resin sealing member 7 is poured into the mold 70. This forms the cylindrical portion 40 into which the radial bearing 9 is insert-molded. At this time, the anti-rotation pin 72 prevents the radial bearing 9 from rotating due to the resin sealing member 7 that has flowed into the mold 70, and is also used to form the through hole 49. As a result, part of the formed through hole 49 is located inside the groove portion 93 when viewed from the axial direction.

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

[0037] According to this embodiment, the radial bearing 9 has a groove 93, and if an anti-rotation pin 72 that engages with the groove 93 of the radial bearing 9 is provided in the mold 70 that forms the cylindrical portion 40, the radial bearing 9 will not rotate within the mold when the radial bearing 9 is inserted to form the cylindrical portion 40. As a result, the radial bearing 9 will not rotate and the anti-rotation portion 94 will not come into contact with the forming pin that forms the through hole 49, so that the through hole 49 can be formed as designed.

[0038] The rotation prevention portion 94 is a flat surface 95 that is perpendicular to the radial direction. This makes it possible to prevent the radial bearing 9 from rotating relative to the cylindrical portion 40 with a simple configuration.

[0039] The flange portion 92 has a polygonal shape when viewed from the axial direction, and the flat surfaces 95 are surfaces that form the sides of the polygonal shape. Therefore, since a plurality of flat surfaces 95 are provided, rotation of the radial bearing 9 relative to the cylindrical portion 40 can be further suppressed.

[0040] Two or more through holes 49 are provided at equal intervals in the circumferential direction around the rotation axis L. The polygonal shape is a regular polygon whose number is an integer multiple of the number of through holes 49. Grooves 93 are provided at all corners 99 of the polygonal shape. A portion of the through holes 49 is located inside the grooves 93 when viewed from the axial direction. This allows the anti-rotation pins 72 that engage with the grooves 93 to be used as pins for forming the through holes 49, thereby simplifying the configuration of the mold 70 that molds the cylindrical portion 40. Furthermore, since the number of grooves 93 is an integer multiple of the number of through holes 49 (two or more), it is easy to align the positions of the anti-rotation pins 72 and the grooves 93 when placing the radial bearing 9 in the mold 70.

[0041] The polygonal shape of the flange portion 92 is a regular square. This allows the area of the flange portion 92 to be smaller when viewed from the axial direction, compared to when the polygonal shape of the flange portion 92 is a polygon larger than a regular square. As a result, the component costs of the radial bearing 9 can be reduced.

[0042] The radial bearing 9 is made of resin and has gate marks 98 on the outer peripheral surface of the flange portion 92. This allows the resin to easily flow in the axial direction within the mold that molds the radial bearing 9 when molding the radial bearing 9, thereby improving the cylindricity of the radial bearing 9.

[0043] The main body 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 of the first portion 96 is larger than the outer diameter of the second portion 97. A first end face 911 on the one side L1 of the first portion 96 is exposed from the cylindrical portion 40 and contacts the thrust bearing 12 arranged on one side of the cylindrical portion 40. Here, in order to reduce the surface pressure when the first end face 911 contacts the thrust bearing 12, it is preferable that the area of the first end face 911 be large. Therefore, the outer diameter of the first portion 96 on which the first end face 911 is formed is larger than the outer diameter of the second portion 97. Therefore, the surface pressure when the first end face 911 contacts the thrust bearing 12 can be reduced, and the component cost of the radial bearing 9 can be reduced compared to when the outer diameter of the first portion 96 and the outer diameter of the second portion 97 are the same.

[0044] The flange portion 92 is provided axially between the first portion 96 and the second portion 97. This allows the resin to flow more easily in the axial direction within the mold that molds the radial bearing 9 when molding the radial bearing 9, compared to when the flange portion 92 is provided in an intermediate portion between the first portion 96 and the second portion 97, thereby improving the cylindricity of the radial bearing 9.

[0045] (Other variations) In the above embodiment, the radial bearing 9 is made of resin, but is not limited to being made of resin. The radial bearing 9 may be made of metal. In this case, the radial bearing 9 may be molded from sintered metal.

[0046] In the above embodiment, the polygonal shape of the flange portion 92 is a regular square, but it may be a polygonal shape larger than a regular square. For example, if there are two through holes 49, the polygonal shape of the flange portion 92 may be a regular hexagon or a regular octagon.

[0047] In the above embodiment, two through holes 49 are provided, but three or more may be provided. For example, if there are three through holes 49, the polygonal shape of the flange portion 92 may be an equilateral triangle, a hexagon, or the like.

[0048] In the above embodiment, the polygonal shape of the flange portion 92 is a regular polygon, but the polygonal shape of the flange portion 92 does not have to be a regular polygon.

[0049] In the above embodiment, the grooves 93 are provided at all the corners 93, but the grooves 93 do not have to be provided at all the corners 93.

[0050] The present technology can be configured as follows.

[0051] (1) a rotor that rotates around a rotation axis; a support shaft that rotatably supports the rotor; an impeller connected to the rotor on one side in an axial direction along the rotation axis of the rotor; Equipped with the rotor includes a bearing through which the support shaft is inserted at its inner periphery, a cylindrical portion that holds the bearing inside, and a magnet that is held on the outside of the cylindrical portion, the cylindrical portion is a resin molded product into which the bearing is insert-molded, and includes 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 protruding from the main body portion radially outward about the rotation axis, The pump device is characterized in that the flange portion has a groove portion cut out in the axial direction and a rotation prevention portion for stopping rotation of the bearing relative to the cylindrical portion.

[0052] As a result, if an anti-rotation pin that engages with the groove of the bearing is provided in the mold that forms the cylindrical portion, the bearing will not rotate within the mold when the bearing is inserted to form the cylindrical portion, thereby preventing the bearing from rotating and causing the anti-rotation portion to come into contact with the forming pin that forms the through hole.

[0053] (2) The pump device according to (1), wherein the rotation prevention portion is a plane perpendicular to the radial direction.

[0054] This makes it possible to suppress rotation of the bearing relative to the cylindrical portion with a simple configuration.

[0055] (3) The flange portion has a polygonal shape when viewed from the axial direction, The pump device according to (2), wherein the plane is a surface that forms a side of the polygonal shape.

[0056] This provides a plurality of flat surfaces, which further prevents the bearing from rotating relative to the cylindrical portion.

[0057] (4) Two or more of the through holes are provided at equal intervals in the circumferential direction around the rotation axis, the polygonal shape is a regular polygon having a number that is an integral multiple of the number of the through holes, the grooves are provided at all corners of the polygonal shape, The pump device according to (3), wherein a portion of the through hole is located inside the groove portion when viewed from the axial direction.

[0058] This allows the anti-rotation pin that engages with the groove to be used as a pin for forming the through hole, thereby simplifying the configuration of the mold for molding the cylindrical portion. Since the number of grooves provided is an integral multiple of the number of two or more through holes, it is easy to align the positions of the anti-rotation pins and the grooves when placing the bearing in a mold.

[0059] (5) The pump device according to (3) or (4), wherein the polygonal shape is a quadrangle.

[0060] This allows the area of the flange portion to be smaller when viewed from the axial direction compared to when the polygonal shape of the flange portion is a polygon larger than a square, thereby reducing the component costs of the bearing.

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

[0062] This allows the resin to flow easily in the axial direction within the mold for molding the bearing when molding the bearing, thereby improving the cylindricity of the bearing.

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

[0064] As a result, the outer diameter dimension of the part where the first end face is formed is larger than the outer diameter dimension of the second part, which reduces the surface pressure when the first end face comes into contact with the thrust bearing, while also reducing the component cost of the bearing compared to when the outer diameter dimension of the first part and the outer diameter dimension of the second part are the same.

[0065] (8) The pump device according to (7), wherein the flange portion is provided between the first portion and the second portion in the axial direction.

[0066] This allows the resin to flow more easily in the axial direction within the mold that molds the bearing when molding the bearing, compared to when the flange portion is provided in the middle of the first or second portion, thereby improving the cylindricity of the bearing. [Explanation of symbols]

[0067] 100...pump device, 2...case, 3...stator, 4...rotor, 5...support shaft, 6...housing, 7...resin sealing 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...second 1 end, 52...second end, 60...partition wall portion, 61...first partition wall portion, 62...second partition wall portion, 63...third partition wall portion, 64...end portion, 65...shaft hole, 66...body portion, 70...mold, 71...fixing pin, 72...anti-rotation pin, 80...center 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, 4 21...crimped portion, 431...protruding portion, 471...first step portion, 472...second step portion, 911...first end surface, L...rotation axis, L1...one side, L2...other side.

Claims

1. a rotor that rotates around a rotation axis; a support shaft that rotatably supports the rotor; an impeller connected to the rotor on one side in an axial direction along the rotation axis of the rotor; Equipped with the rotor includes a bearing through which the support shaft is inserted at its inner periphery, a cylindrical portion that holds the bearing inside, and a magnet that is held on the outside of the cylindrical portion, the cylindrical portion is a resin molded product into which the bearing is insert-molded, and includes 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 protruding from the main body portion radially outward about the rotation axis, The pump device is characterized in that the flange portion has a groove portion cut out in the axial direction and a rotation prevention portion for stopping rotation of the bearing relative to the cylindrical portion.

2. The pump device according to claim 1, wherein the rotation prevention portion is a flat surface perpendicular to the radial direction.

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

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

5. 5. The pump device according to claim 3, wherein the polygonal shape is a quadrangle.

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

7. the main body portion includes a cylindrical first portion located on the one side and a cylindrical second portion located on the other side of the first portion in the axial direction, The outer diameter of the first portion is larger than the outer diameter of the second portion, 2. The pump device according to claim 1, wherein a first end surface on the one side of the first portion is exposed from the cylindrical portion and contacts a thrust bearing arranged 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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