WO2023002734A1 - Fluid machine - Google Patents

Fluid machine Download PDF

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Publication number
WO2023002734A1
WO2023002734A1 PCT/JP2022/018902 JP2022018902W WO2023002734A1 WO 2023002734 A1 WO2023002734 A1 WO 2023002734A1 JP 2022018902 W JP2022018902 W JP 2022018902W WO 2023002734 A1 WO2023002734 A1 WO 2023002734A1
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WO
WIPO (PCT)
Prior art keywords
bottom wall
rotor
fluid machine
wall portion
cylindrical
Prior art date
Application number
PCT/JP2022/018902
Other languages
French (fr)
Japanese (ja)
Inventor
智彦 岩崎
博 齋藤
Original Assignee
株式会社豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2023002734A1 publication Critical patent/WO2023002734A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/14—Casings; Enclosures; Supports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings

Definitions

  • the present disclosure relates to fluid machinery.
  • a fluid machine has an operating body that sucks and discharges fluid within a housing.
  • Fluid machinery may also include a motor that is housed in a housing and that rotates an operating body.
  • the motor has a stator having a cylindrical stator core fixed to the inner peripheral surface of the housing, and a rotor arranged radially inside the stator.
  • the rotor has a tubular portion having one axial end and the other axial end, a magnetic body fixed to the inner peripheral surface of the tubular portion, and a shaft member fixed to one end of the tubular portion.
  • the shaft member may have an annular plate portion that protrudes radially outward of the stator from the tubular portion.
  • a fluid machine may include a radial bearing that rotatably supports a rotor and a thrust bearing that rotatably supports a plate portion.
  • the shaft member is not fixed to the other end of the tubular portion, and the other end of the tubular portion may be open. In this way, a space may be formed in the other end of the cylindrical portion.
  • the radial bearing is provided radially outside the space, for example.
  • the rotor when an operator assembles a fluid machine having such a rotor, the rotor may be inserted into the radial bearing after fixing the shaft member to one end of the cylindrical portion. At this time, since the shaft member fixed to one end of the cylindrical portion has a plate portion, when an operator inserts the rotor into the radial bearing, the rotor is pulled from the other end of the cylindrical portion. It must be inserted against the radial bearing. Therefore, in order to improve the assembling workability of the fluid machine, it is desirable to make it easier to insert the rotor into the radial bearing from the other end of the cylindrical portion.
  • a fluid machine includes a housing, an operating body that sucks and discharges fluid in the housing, and a motor that is housed in the housing and rotates the operating body.
  • the motor has a stator having a cylindrical stator core fixed to the inner peripheral surface of the housing, a rotor arranged radially inside the stator, and a radial bearing rotatably supporting the rotor.
  • the rotor includes a tubular portion having one axial end and the other axial end, a magnetic body fixed to an inner peripheral surface of the tubular portion, and a shaft member fixed to one end of the tubular portion. have.
  • the shaft member has an annular plate portion that protrudes radially outward from the cylindrical portion.
  • the fluid machine further includes a thrust bearing that rotatably supports the plate portion.
  • a space is formed at the other end of the cylindrical portion.
  • the radial bearing is positioned radially outward of the space.
  • the rotor has a bottom wall portion continuously extending from the other end of the tubular portion.
  • the bottom wall portion extends further inward in the radial direction than the tubular portion.
  • the bottom wall portion partitions the space portion together with the cylindrical portion and the magnetic body.
  • the bottom wall portion has a tapered outer peripheral surface. The outer diameter of the outer peripheral surface decreases with increasing distance from the other end of the cylindrical portion in the axial direction.
  • FIG. 1 is a side cross-sectional view showing a fluid machine according to an embodiment
  • FIG. Sectional drawing which expands and shows a part of fluid machine The front view of a cylinder member. Sectional drawing which expands and shows a part of fluid machine in another embodiment. The front view of a cylinder member. Sectional drawing which expands and shows a part of fluid machine in another another embodiment. The front view of a cylinder member. Sectional drawing which expands and shows a part of fluid machine in another another embodiment.
  • the fluid machine 10 has a tubular housing 11 .
  • Housing 11 includes motor housing 12 , actuator housing 13 , first intermediate housing 16 and second intermediate housing 17 .
  • the motor housing 12, the actuator housing 13, the first intermediate housing 16, and the second intermediate housing 17 are each made of metal material, for example, aluminum.
  • the motor housing 12 has a plate-like end wall 12a and a peripheral wall 12b.
  • the peripheral wall 12b extends cylindrically from the outer peripheral portion of the end wall 12a.
  • the second intermediate housing 17 is connected to the motor housing 12 while closing the opening of the peripheral wall 12b on the side opposite to the end wall 12a.
  • a motor chamber 18 is defined by the end wall 12 a of the motor housing 12 , the peripheral wall 12 b and the second intermediate housing 17 .
  • a suction hole 12h for sucking fluid is formed in a portion of the peripheral wall 12b near the end wall 12a. The suction hole 12h communicates with the motor chamber 18. As shown in FIG. Therefore, fluid is sucked into the motor chamber 18 through the suction hole 12h.
  • a circular shaft insertion hole 17 a is formed in the central portion of the second intermediate housing 17 .
  • the second intermediate housing 17 also has a cylindrical first bearing holding portion 19 .
  • the first bearing holding portion 19 is located in the central portion of the second intermediate housing 17 .
  • the inner side of the first bearing holding portion 19 communicates with the shaft insertion hole 17a.
  • the central axis of the first bearing holding portion 19 and the central axis of the shaft insertion hole 17a coincide with each other.
  • a first radial bearing 20 is held in the first bearing holding portion 19 .
  • the end wall 12a of the motor housing 12 has a cylindrical second bearing holding portion 21. As shown in FIG.
  • the second bearing holding portion 21 is located in the central portion of the end wall 12 a of the motor housing 12 .
  • the central axis of the first bearing holding portion 19 and the central axis of the second bearing holding portion 21 are aligned.
  • a second radial bearing 22 is held in the second bearing holding portion 21 .
  • a first chamber-forming concave portion 17b is formed on the outer surface of the second intermediate housing 17 on the side opposite to the motor chamber 18 .
  • the first chamber forming recess 17b communicates with the shaft insertion hole 17a.
  • the second intermediate housing 17 has a plurality of through holes 23 .
  • Each through hole 23 is located at a portion near the outer periphery of the second intermediate housing 17 .
  • Each through hole 23 extends through the second intermediate housing 17 .
  • the through hole 23 communicates the motor chamber 18 and the first chamber-forming concave portion 17b.
  • the first intermediate housing 16 is connected to the second intermediate housing 17.
  • the first intermediate housing 16 is connected to the second intermediate housing 17 so as to block the opening of the first chamber forming recess 17b.
  • a thrust bearing accommodating chamber 25 is defined by the first intermediate housing 16 and the first chamber-forming concave portion 17 b of the second intermediate housing 17 .
  • a circular shaft insertion hole 16 a is formed in the central portion of the first intermediate housing 16 .
  • the first intermediate housing 16 has a plurality of through holes 16b. Each through-hole 16 b is located at a portion near the outer periphery of the first intermediate housing 16 . Each through hole 16b penetrates through the first intermediate housing 16 .
  • a second chamber-forming concave portion 16 c is formed on the outer surface of the first intermediate housing 16 on the side opposite to the thrust bearing accommodating chamber 25 .
  • the second chamber forming recess 16c communicates with the shaft insertion hole 16a.
  • Each through hole 16b communicates the thrust bearing housing chamber 25 with the second chamber forming recess 16c.
  • the actuator housing 13 is connected to the first intermediate housing 16 .
  • the operating body housing 13 has a discharge hole 13h for discharging fluid. 13 h of discharge holes discharge the fluid from the actuator housing 13. As shown in FIG.
  • the fluid machine 10 has a motor 40 .
  • a motor 40 is housed in the motor chamber 18 .
  • the motor 40 has a stator 41 and a rotor 42 .
  • the stator 41 is fixed to the peripheral wall 12b of the motor housing 12.
  • the stator 41 has a cylindrical stator core 43 and coils 44 .
  • the stator core 43 is fixed to the inner peripheral surface 121b of the peripheral wall 12b of the motor housing 12.
  • Coil 44 is wound around stator core 43 .
  • the motor 40 has a coil end 44e. The coil ends 44e are part of the coil 44 and protrude from the first end surface 43a and the second end surface 43b of the stator core 43, respectively.
  • the rotor 42 has a tubular member 46 , a permanent magnet 47 that is a magnetic material, and a shaft member 48 .
  • the cylindrical member 46 is made of stainless steel, for example.
  • the cylindrical member 46 is made of SUS316, for example.
  • the cylindrical member 46 has a cylindrical cylindrical portion 49 . Therefore, the rotor 42 has a tubular portion 49 .
  • the permanent magnet 47 has a solid cylindrical shape.
  • the permanent magnet 47 is press-fitted into the inner peripheral surface 491 of the cylindrical portion 49 . Thereby, the permanent magnet 47 is fixed to the inner peripheral surface 491 of the cylindrical portion 49 .
  • the axis of the permanent magnet 47 coincides with the axis of the tubular portion 49 .
  • the axial length of the permanent magnet 47 is shorter than the axial length of the cylindrical portion 49 .
  • a first end surface 47a and a second end surface 47b in the axial direction of the permanent magnet 47 are flat surfaces.
  • the first end surface 47a and the second end surface 47b extend in a direction orthogonal to the axial direction.
  • the permanent magnets 47 are magnetized in the radial direction of the permanent magnets 47 .
  • the first end surface 47a of the permanent magnet 47 is located inside the inner peripheral surface 491 of the cylindrical portion 49. Accordingly, one axial end 49 a of the cylindrical portion 49 protrudes from the first end face 47 a of the permanent magnet 47 .
  • a second end surface 47 b of the permanent magnet 47 is located inside the inner peripheral surface 491 of the cylindrical portion 49 . Therefore, the other axial end portion 49 b of the cylindrical portion 49 protrudes from the second end surface 47 b of the permanent magnet 47 .
  • the axial length of the cylindrical portion 49 is longer than the axial length of the stator core 43 .
  • One end portion 49 a of the cylindrical portion 49 protrudes from the first end surface 43 a of the stator core 43 .
  • the other end portion 49b of the tubular portion 49 protrudes from the second end surface 43b of the stator core 43 .
  • the rotor 42 is arranged radially inside the stator 41 .
  • the shaft member 48 is provided at one end portion 49 a of the tubular portion 49 .
  • the shaft member 48 is made of iron.
  • the shaft member 48 has a press-fit portion 48a, a flange portion 48b, a shaft portion 48c, and a plate portion 48d.
  • the press-fit portion 48a has a cylindrical shape.
  • the press-fitting portion 48 a is press-fitted into one end portion 49 a of the tubular portion 49 . Therefore, the shaft member 48 is fixed to one end portion 49 a of the tubular portion 49 .
  • the axis of the shaft member 48 coincides with the axis of the permanent magnet 47 .
  • the flange portion 48b is cylindrical.
  • the flange portion 48b is continuous with the end portion of the press-fitting portion 48a on the side opposite to the permanent magnet 47 .
  • the outer diameter of the flange portion 48b is larger than the outer diameter of the press-fitting portion 48a.
  • the shaft portion 48c is cylindrical.
  • the shaft portion 48c is continuous with the end portion of the flange portion 48b opposite to the permanent magnet 47 .
  • the outer diameter of the shaft portion 48c is smaller than the outer diameter of the flange portion 48b.
  • the plate portion 48d is arranged in the thrust bearing housing chamber 25.
  • the plate portion 48d protrudes in an annular shape from the outer peripheral surface 480b of the flange portion 48b.
  • the outer diameter of the plate portion 48 d is larger than the outer diameter of the cylinder portion 49 . Therefore, the plate portion 48 d protrudes radially outward from the cylindrical portion 49 .
  • the plate portion 48d is rotatable integrally with the flange portion 48b.
  • the cylindrical member 46 has a bottom wall portion 50.
  • the rotor 42 further has a bottom wall portion 50 .
  • the bottom wall portion 50 extends continuously from the other end portion 49 b of the tubular portion 49 . Therefore, the bottom wall portion 50 is integrated with the tubular portion 49 .
  • the bottom wall portion 50 is integrally formed with the tubular portion 49 . Therefore, the bottom wall portion 50 is made of stainless steel.
  • the bottom wall portion 50 is made of SUS316.
  • the bottom wall portion 50 is substantially disc-shaped.
  • the bottom wall portion 50 has an inner end surface 501 and an outer end surface 502 .
  • the inner end face 501 faces the second end face 47 b of the permanent magnet 47 .
  • the bottom wall portion 50 has an outer peripheral surface 500 .
  • the outer peripheral surface 500 is flat.
  • the outer peripheral surface 500 is tapered.
  • the outer diameter of the outer peripheral surface 500 decreases with distance from the other end 49b of the cylindrical portion 49 in the axial direction. Therefore, the bottom wall portion 50 extends radially inward of the tubular portion 49 from the tubular portion 49 .
  • the outer peripheral surface 500 extends along the entire circumference of the cylindrical portion 49 . Therefore, the bottom wall portion 50 extends over the entire circumference of the tubular portion 49 in the circumferential direction.
  • the thickness T1 of the bottom wall portion 50 is thicker than the thickness T2 of the tubular portion 49 .
  • the bottom wall portion 50 is formed in the cylindrical member 46 by forming the cylindrical member 46 by deep drawing.
  • a space portion S1 is formed in the other end portion 49b of the cylindrical portion 49. As shown in FIG.
  • the space S ⁇ b>1 is defined by the inner peripheral surface 491 of the tubular portion 49 , the second end surface 47 b of the permanent magnet 47 , and the inner end surface 501 of the bottom wall portion 50 . Therefore, the bottom wall portion 50 extends radially inward of the tubular portion 49 from the tubular portion 49 .
  • the bottom wall portion 50 defines a space portion S1 together with the cylindrical portion 49 and the permanent magnets 47 . In this embodiment, the bottom wall portion 50 closes the space S1.
  • the first radial bearing 20 rotatably supports one end portion 49a of the cylindrical portion 49.
  • the second radial bearing 22 rotatably supports the other end portion 49b of the tubular portion 49 .
  • the first radial bearing 20 and the second radial bearing 22 are gas bearings. It supports the tubular portion 49 while in contact with the portion 49 . Then, when the rotation speed of the rotor 42 reaches the floating rotation speed, dynamic pressure generated between the tubular portion 49 and the first radial bearing 20 and between the tubular portion 49 and the second radial bearing 22 causes the tubular portion 49 to move.
  • the cylindrical portion 49 is rotatably supported in a non-contact state with respect to the first radial bearing 20 and the second radial bearing 22 . Therefore, the first radial bearing 20 and the second radial bearing 22 rotatably support the rotor 42 .
  • the second radial bearing 22 is provided radially outside the space S1. Therefore, the second radial bearing 22 is a radial bearing that rotatably supports the rotor 42 and is provided radially outside the space S1.
  • Thrust bearings 51 which are gas bearings, are arranged between the first intermediate housing 16 and the plate portion 48d and between the second intermediate housing 17 and the plate portion 48d.
  • the plate portion 48 d rotates with the rotation of the rotor 42 , dynamic pressure is generated between the plate portion 48 d and both thrust bearings 51 .
  • the plate portion 48 d is floated with respect to the thrust bearings 51 by the thrust bearings 51 , and the rotor 42 is rotatably supported without contact with the thrust bearings 51 .
  • the fluid machine 10 includes an operating body A1.
  • the actuator A ⁇ b>1 is housed in the actuator housing 13 .
  • the actuator A ⁇ b>1 is connected to a shaft member 48 inserted through the actuator housing 13 .
  • the fluid is sucked into the motor chamber 18 through the suction hole 12h.
  • the fluid sucked into the motor chamber 18 passes through the through holes 23 , the thrust bearing housing chamber 25 , the through holes 16 b , and the second chamber forming recess 16 c and is sucked into the actuator housing 13 .
  • Fluid is discharged from the actuator housing 13 through the discharge hole 13h by the rotation of the actuator A1. Accordingly, the working body A1 draws and discharges fluid within the housing 11 .
  • the operator fixes the shaft member 48 to the one end portion 49 a of the cylindrical portion 49 and then attaches the rotor 42 to the first radial bearing 20 . , the inside of the stator core 43 and the second radial bearing 22 .
  • the shaft member 48 fixed to the one end portion 49a of the cylindrical portion 49 has a plate portion 48d. Therefore, when an operator inserts the rotor 42 into the first radial bearing 20 , the inside of the stator core 43 , and the second radial bearing 22 , the operator inserts the rotor 42 from the other end 49 b of the cylindrical portion 49 . should be inserted into the first radial bearing 20 , the inside of the stator core 43 and the second radial bearing 22 .
  • the bottom wall portion 50 has a tapered outer peripheral surface 500, and the outer diameter of the outer peripheral surface 500 becomes smaller as the distance from the other end portion 49b of the tubular portion 49 in the axial direction of the tubular portion 49 increases. . That is, the end portion of the rotor 42 corresponding to the other end portion 49b of the tubular portion 49 is tapered. Therefore, the operator can easily insert the rotor 42 into the first radial bearing 20 , the inside of the stator core 43 , and the second radial bearing 22 from the end corresponding to the other end 49 b of the cylindrical portion 49 . As a result, the assembling workability of the fluid machine 10 is improved.
  • the rotor 42 has a bottom wall portion 50 . According to this, the strength of the other end portion 49b of the tubular portion 49 can be improved as compared with the case where the rotor 42 does not have the bottom wall portion 50 . Therefore, for example, even if the other end portion 49b of the tubular portion 49 receives a radial load, the other end portion 49b of the tubular portion 49 is less likely to deform, so the durability of the rotor 42 can be improved.
  • the bottom wall portion 50 has a tapered outer peripheral surface 500 , and the outer diameter of the outer peripheral surface 500 decreases as the distance from the other end portion 49 b of the tubular portion 49 in the axial direction of the tubular portion 49 increases. That is, the end portion of the rotor 42 corresponding to the other end portion 49b of the tubular portion 49 is tapered. Therefore, the operator can easily insert the rotor 42 into the second radial bearing 22 from the end corresponding to the other end 49 b of the cylindrical portion 49 . As a result, workability of assembling the fluid machine 10 can be improved. As described above, it is possible to improve the assembling workability while improving the durability of the rotor 42 .
  • the bottom wall portion 50 extends over the entire circumference of the cylinder portion 49 in the circumferential direction. According to this, the strength of the other end portion 49b of the tubular portion 49 can be further improved compared to the case where the bottom wall portion 50 extends only in a part of the tubular portion 49 in the circumferential direction. Therefore, since the other end portion 49b of the cylindrical portion 49 is more difficult to deform, the durability of the rotor 42 can be further improved.
  • the thickness T1 of the bottom wall portion 50 is thicker than the thickness T2 of the tubular portion 49 . According to this, the strength of the bottom wall portion 50 can be improved compared to the case where the thickness T1 of the bottom wall portion 50 is equal to or less than the thickness T2 of the tubular portion 49 . As a result, the other end portion 49b of the cylindrical portion 49 is more difficult to deform, so the durability of the rotor 42 can be further improved. In addition, the thinner the thickness T2 of the cylindrical portion 49, the more the eddy current loss generated in the cylindrical portion 49 can be reduced, so the motor efficiency can be improved.
  • the bottom wall portion 50 closes the space portion S1. According to this, the strength of the bottom wall portion 50 can be improved compared to the case where the bottom wall portion 50 does not block the space portion S1. As a result, the other end portion 49b of the cylindrical portion 49 is more difficult to deform, so the durability of the rotor 42 can be further improved.
  • the bottom wall portion 50 is formed in the cylindrical member 46 by forming the cylindrical member 46 by deep drawing. According to this, for example, the manufacturing process can be simplified as compared with the case where the bottom wall portion 50 which is separate from the tubular portion 49 is welded to the other end portion 49b of the tubular portion 49 . Further, since the cylindrical member 46 is formed by deep drawing, the strength of the other end portion 49b of the cylindrical portion 49 can be improved by work hardening of the material.
  • the bottom wall portion 60 may be formed by bending the other end portion 49 b of the tubular member 46 radially inwardly of the tubular portion 49 . At this time, the bottom wall portion 60 does not block the space portion S1.
  • the other end portion 49b of the tubular portion 49 before being bent is illustrated by a chain double-dashed line.
  • the bottom wall portion 60 extends over the entire circumference of the cylinder portion 49 in the circumferential direction.
  • the bottom wall portion 60 has an outer peripheral surface 600 .
  • the outer peripheral surface 600 is tapered.
  • the outer peripheral surface 600 has an outer diameter smaller than that of the other end portion 49 b of the tubular portion 49 , and the outer diameter decreases with distance from the other end portion 49 b of the tubular portion 49 in the axial direction of the tubular portion 49 . Therefore, the end portion of the rotor 42 corresponding to the other end portion 49b of the tubular portion 49 is tapered.
  • the bottom wall portion 50 may have a communication hole 50h for introducing fluid into the space portion S1.
  • the communication hole 50h introduces part of the fluid sucked into the motor chamber 18 from the suction hole 12h into the space S1. According to this, the permanent magnet 47 is cooled by the fluid introduced into the space S1 through the communication hole 50h. Therefore, durability of the rotor 42 can be further improved.
  • the communication hole 50h does not have to introduce part of the fluid sucked into the motor chamber 18 from the suction hole 12h into the space S1.
  • a cooling channel may be connected to the communication hole 50h.
  • the bottom wall portion 50 may be positioned radially inside the second radial bearing 22 .
  • the bottom wall portion 50 is located radially inside the second radial bearing 22 .
  • the axial direction of the cylindrical portion 49 is reduced. shorter in length. As a result, a decrease in the primary resonance rotational speed of the rotor 42 can be suppressed.
  • the bottom wall portion 50 is inclined to the inner peripheral surface 220 of the second radial bearing 22 . Don't hit the corner.
  • the bottom wall portion 50 may extend only in a part of the cylindrical portion 49 in the circumferential direction. O In the embodiment, the thickness T1 of the bottom wall portion 50 may be equal to the thickness T2 of the tubular portion 49 .
  • the thickness T1 of the bottom wall portion 50 may be thinner than the thickness T2 of the tubular portion 49 .
  • bottom wall part 50 may be formed by ironing.
  • the cylinder part 49 and the bottom wall part 50 may be formed with the austenitic stainless steel like SUS304, for example.
  • the bottom wall part 50 of the cylinder part 49 may be partially notched in order to reduce the unbalance amount of the rotor 42.
  • the outer peripheral surface 500 of the bottom wall portion 50 may be curved, for example.
  • the bottom wall portion 50 has a tapered outer peripheral surface, and the outer peripheral surface has an outer diameter smaller than that of the other end portion 49b of the tubular portion 49. It is only necessary that the outer diameter becomes smaller as it is spaced apart in the axial direction of 49 .
  • the operating body A1 may be attached to the bottom wall portion 50 .
  • the fluid machine 10 may not be mounted on an automobile, and may be used for other purposes.
  • a magnetic body such as a laminated core, an amorphous core, or a dust core may be used.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Frames (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Compressor (AREA)

Abstract

A fluid machine (10) comprises a housing (11), an operating body (A1), and a motor (40). The motor (40) includes a stator (41), a rotor (42), and radial bearings (20, 22). The rotor (42) includes a tubular portion (49) having one end portion and an other end portion, a magnetic body (47), and a shaft member (48). A space portion (S1) is formed inside the other end portion (49b) of the tubular portion (49). The radial bearings (20, 22) are positioned on the radially outer side of the space portion (S1). The rotor (42) has a bottom wall portion (50). The bottom wall portion (50) defines the space portion (S1) in conjunction with the tubular portion (49) and the magnetic body (47). An outer diameter of an outer circumferential surface (500) of the bottom wall portion decreases with increasing separation, in the axial direction, from the other end portion (49b) of the tubular portion (49).

Description

流体機械Fluid machinery
　本開示は、流体機械に関する。 The present disclosure relates to fluid machinery.
　流体機械は、ハウジング内にて流体を吸入して吐出する作動体を備えている。また、流体機械は、ハウジングに収容されるとともに作動体を回転させるモータを備えている場合がある。モータは、ハウジングの内周面に固定される筒状のステータコアを有するステータと、ステータの径方向内側に配置されるロータと、を有している。ロータは、軸方向の一端部と他端部とを有する筒部と、筒部の内周面に固定された磁性体と、筒部の一端部に固定された軸部材と、を有している場合がある。軸部材は、筒部よりもステータの径方向外側に突出する環状のプレート部を有している場合がある。そして、流体機械は、ロータを回転可能に支持するラジアル軸受と、プレート部を回転可能に支持するスラスト軸受と、を備えている場合がある。また、例えば特許文献１に開示されているロータのように、筒部の他端部には軸部材が固定されておらず、筒部の他端部が開口している場合がある。このように、筒部の他端部内に空間部が形成されている場合がある。このような場合、ラジアル軸受は、例えば、空間部の径方向外側に設けられている。 A fluid machine has an operating body that sucks and discharges fluid within a housing. Fluid machinery may also include a motor that is housed in a housing and that rotates an operating body. The motor has a stator having a cylindrical stator core fixed to the inner peripheral surface of the housing, and a rotor arranged radially inside the stator. The rotor has a tubular portion having one axial end and the other axial end, a magnetic body fixed to the inner peripheral surface of the tubular portion, and a shaft member fixed to one end of the tubular portion. There are cases. The shaft member may have an annular plate portion that protrudes radially outward of the stator from the tubular portion. A fluid machine may include a radial bearing that rotatably supports a rotor and a thrust bearing that rotatably supports a plate portion. Further, for example, as in the rotor disclosed in Patent Document 1, the shaft member is not fixed to the other end of the tubular portion, and the other end of the tubular portion may be open. In this way, a space may be formed in the other end of the cylindrical portion. In such a case, the radial bearing is provided radially outside the space, for example.
特開２００２－１４２３９３号公報JP-A-2002-142393
　特許文献１のように、筒部の一端部に軸部材が固定されており、筒部の他端部が開口している場合、筒部の他端部の強度は、筒部の一端部の強度よりも低い。そのため、筒部の他端部がラジアル荷重を受けた際に筒部の他端部が変形し易く、ロータの耐久性が低下する虞がある。 When the shaft member is fixed to one end of the tubular portion and the other end of the tubular portion is open as in Patent Document 1, the strength of the other end of the tubular portion is the same as that of the one end of the tubular portion. lower than strength. Therefore, when the other end portion of the tubular portion receives a radial load, the other end portion of the tubular portion is likely to be deformed, which may reduce the durability of the rotor.
　また、作業者がこのようなロータを備えた流体機械を組み付ける際には、筒部の一端部に軸部材を固定した後に、ロータをラジアル軸受に対して挿入する場合がある。このとき、筒部の一端部に固定された軸部材は、プレート部を有しているため、作業者がロータをラジアル軸受に対して挿入する際には、筒部の他端部からロータをラジアル軸受に対して挿入する必要がある。したがって、流体機械の組み付け作業性を向上させるためには、筒部の他端部からロータをラジアル軸受に対して挿入し易くすることが望まれる。 Further, when an operator assembles a fluid machine having such a rotor, the rotor may be inserted into the radial bearing after fixing the shaft member to one end of the cylindrical portion. At this time, since the shaft member fixed to one end of the cylindrical portion has a plate portion, when an operator inserts the rotor into the radial bearing, the rotor is pulled from the other end of the cylindrical portion. It must be inserted against the radial bearing. Therefore, in order to improve the assembling workability of the fluid machine, it is desirable to make it easier to insert the rotor into the radial bearing from the other end of the cylindrical portion.
　本開示の一態様に係る流体機械は、ハウジングと、前記ハウジング内にて流体を吸入して吐出する作動体と、前記ハウジングに収容されるとともに前記作動体を回転させるモータと、を備える。前記モータは、前記ハウジングの内周面に固定される筒状のステータコアを有するステータと、前記ステータの径方向内側に配置されるロータと、前記ロータを回転可能に支持するラジアル軸受と、を有する。前記ロータは、軸方向の一端部と他端部とを有する筒部と、前記筒部の内周面に固定された磁性体と、前記筒部の一端部に固定された軸部材と、を有する。前記軸部材は、前記筒部よりも前記径方向外側に突出する環状のプレート部を有する。前記流体機械は、前記プレート部を回転可能に支持するスラスト軸受をさらに備える。前記筒部の他端部には、空間部が形成されている。前記ラジアル軸受は、前記空間部の径方向外側に位置している。前記ロータは、前記筒部の他端部から連続して延在する底壁部を有する。該底壁部は、前記筒部よりも前記径方向内側に向かって延在している。前記底壁部は、前記筒部及び前記磁性体と共に前記空間部を区画する。前記底壁部は、テーパ状の外周面を有する。前記外周面は、前記筒部の他端部から前記軸方向に離間するにつれて外径が小さくなっている。 A fluid machine according to an aspect of the present disclosure includes a housing, an operating body that sucks and discharges fluid in the housing, and a motor that is housed in the housing and rotates the operating body. The motor has a stator having a cylindrical stator core fixed to the inner peripheral surface of the housing, a rotor arranged radially inside the stator, and a radial bearing rotatably supporting the rotor. . The rotor includes a tubular portion having one axial end and the other axial end, a magnetic body fixed to an inner peripheral surface of the tubular portion, and a shaft member fixed to one end of the tubular portion. have. The shaft member has an annular plate portion that protrudes radially outward from the cylindrical portion. The fluid machine further includes a thrust bearing that rotatably supports the plate portion. A space is formed at the other end of the cylindrical portion. The radial bearing is positioned radially outward of the space. The rotor has a bottom wall portion continuously extending from the other end of the tubular portion. The bottom wall portion extends further inward in the radial direction than the tubular portion. The bottom wall portion partitions the space portion together with the cylindrical portion and the magnetic body. The bottom wall portion has a tapered outer peripheral surface. The outer diameter of the outer peripheral surface decreases with increasing distance from the other end of the cylindrical portion in the axial direction.
実施形態における流体機械を示す側断面図。1 is a side cross-sectional view showing a fluid machine according to an embodiment; FIG. 流体機械の一部分を拡大して示す断面図。Sectional drawing which expands and shows a part of fluid machine. 筒部材の正面図。The front view of a cylinder member. 別の実施形態における流体機械の一部分を拡大して示す断面図。Sectional drawing which expands and shows a part of fluid machine in another embodiment. 筒部材の正面図。The front view of a cylinder member. もう一つの別の実施形態における流体機械の一部分を拡大して示す断面図。Sectional drawing which expands and shows a part of fluid machine in another another embodiment. 筒部材の正面図。The front view of a cylinder member. さらにもう一つの別の実施形態における流体機械の一部分を拡大して示す断面図。Sectional drawing which expands and shows a part of fluid machine in another another embodiment.
　以下、流体機械の一実施形態を図１～図３にしたがって説明する。
　＜流体機械１０の全体構成＞
　図１に示すように、流体機械１０は、筒状のハウジング１１を備えている。ハウジング１１は、モータハウジング１２、作動体ハウジング１３、第１中間ハウジング１６、及び第２中間ハウジング１７を有している。モータハウジング１２、作動体ハウジング１３、第１中間ハウジング１６、及び第２中間ハウジング１７は、それぞれ金属材料製であり、例えば、アルミニウム製である。 An embodiment of the fluid machine will be described below with reference to FIGS. 1 to 3. FIG.
<Overall Configuration of Fluid Machine 10>
As shown in FIG. 1, the fluid machine 10 has a tubular housing 11 . Housing 11 includes motor housing 12 , actuator housing 13 , first intermediate housing 16 and second intermediate housing 17 . The motor housing 12, the actuator housing 13, the first intermediate housing 16, and the second intermediate housing 17 are each made of metal material, for example, aluminum.
　モータハウジング１２は、板状の端壁１２ａと、周壁１２ｂと、を有している。周壁１２ｂは、端壁１２ａの外周部から筒状に延びている。
　第２中間ハウジング１７は、周壁１２ｂにおける端壁１２ａとは反対側の開口を閉塞した状態で、モータハウジング１２に連結されている。そして、モータハウジング１２の端壁１２ａ、周壁１２ｂ、及び第２中間ハウジング１７によって、モータ室１８が区画されている。周壁１２ｂにおける端壁１２ａ寄りの部位には、流体を吸入する吸入孔１２ｈが形成されている。吸入孔１２ｈは、モータ室１８に連通している。したがって、モータ室１８には、吸入孔１２ｈを介して流体が吸入される。 The motor housing 12 has a plate-like end wall 12a and a peripheral wall 12b. The peripheral wall 12b extends cylindrically from the outer peripheral portion of the end wall 12a.
The second intermediate housing 17 is connected to the motor housing 12 while closing the opening of the peripheral wall 12b on the side opposite to the end wall 12a. A motor chamber 18 is defined by the end wall 12 a of the motor housing 12 , the peripheral wall 12 b and the second intermediate housing 17 . A suction hole 12h for sucking fluid is formed in a portion of the peripheral wall 12b near the end wall 12a. The suction hole 12h communicates with the motor chamber 18. As shown in FIG. Therefore, fluid is sucked into the motor chamber 18 through the suction hole 12h.
　第２中間ハウジング１７の中央部には、円孔状のシャフト挿通孔１７ａが形成されている。また、第２中間ハウジング１７は、円筒状の第１軸受保持部１９を有している。第１軸受保持部１９は、第２中間ハウジング１７の中央部に位置している。第１軸受保持部１９の内側は、シャフト挿通孔１７ａに連通している。第１軸受保持部１９の中心軸線とシャフト挿通孔１７ａの中心軸線とは互いに一致している。第１軸受保持部１９には、第１ラジアル軸受２０が保持されている。 A circular shaft insertion hole 17 a is formed in the central portion of the second intermediate housing 17 . The second intermediate housing 17 also has a cylindrical first bearing holding portion 19 . The first bearing holding portion 19 is located in the central portion of the second intermediate housing 17 . The inner side of the first bearing holding portion 19 communicates with the shaft insertion hole 17a. The central axis of the first bearing holding portion 19 and the central axis of the shaft insertion hole 17a coincide with each other. A first radial bearing 20 is held in the first bearing holding portion 19 .
　また、モータハウジング１２の端壁１２ａは、円筒状の第２軸受保持部２１を有している。第２軸受保持部２１は、モータハウジング１２の端壁１２ａの中央部に位置している。第１軸受保持部１９の中心軸線と第２軸受保持部２１の中心軸線とは一致している。第２軸受保持部２１には、第２ラジアル軸受２２が保持されている。 In addition, the end wall 12a of the motor housing 12 has a cylindrical second bearing holding portion 21. As shown in FIG. The second bearing holding portion 21 is located in the central portion of the end wall 12 a of the motor housing 12 . The central axis of the first bearing holding portion 19 and the central axis of the second bearing holding portion 21 are aligned. A second radial bearing 22 is held in the second bearing holding portion 21 .
　第２中間ハウジング１７におけるモータ室１８とは反対側の外面には、第１室形成凹部１７ｂが形成されている。第１室形成凹部１７ｂは、シャフト挿通孔１７ａに連通している。また、第２中間ハウジング１７は、複数の貫通孔２３を有している。各貫通孔２３は、第２中間ハウジング１７の外周寄りの部位に位置している。各貫通孔２３は、第２中間ハウジング１７を貫通している。貫通孔２３は、モータ室１８と第１室形成凹部１７ｂとを連通している。 A first chamber-forming concave portion 17b is formed on the outer surface of the second intermediate housing 17 on the side opposite to the motor chamber 18 . The first chamber forming recess 17b communicates with the shaft insertion hole 17a. Also, the second intermediate housing 17 has a plurality of through holes 23 . Each through hole 23 is located at a portion near the outer periphery of the second intermediate housing 17 . Each through hole 23 extends through the second intermediate housing 17 . The through hole 23 communicates the motor chamber 18 and the first chamber-forming concave portion 17b.
　第１中間ハウジング１６は、第２中間ハウジング１７に連結されている。第１中間ハウジング１６は、第１室形成凹部１７ｂの開口を閉塞するように第２中間ハウジング１７に連結されている。第１中間ハウジング１６と第２中間ハウジング１７の第１室形成凹部１７ｂとによって、スラスト軸受収容室２５が区画されている。第１中間ハウジング１６の中央部には、円孔状のシャフト挿通孔１６ａが形成されている。 The first intermediate housing 16 is connected to the second intermediate housing 17. The first intermediate housing 16 is connected to the second intermediate housing 17 so as to block the opening of the first chamber forming recess 17b. A thrust bearing accommodating chamber 25 is defined by the first intermediate housing 16 and the first chamber-forming concave portion 17 b of the second intermediate housing 17 . A circular shaft insertion hole 16 a is formed in the central portion of the first intermediate housing 16 .
　第１中間ハウジング１６は、複数の貫通孔１６ｂを有している。各貫通孔１６ｂは、第１中間ハウジング１６の外周寄りの部位に位置している。各貫通孔１６ｂは、第１中間ハウジング１６を貫通している。第１中間ハウジング１６におけるスラスト軸受収容室２５とは反対側の外面には、第２室形成凹部１６ｃが形成されている。第２室形成凹部１６ｃは、シャフト挿通孔１６ａに連通している。各貫通孔１６ｂは、スラスト軸受収容室２５と第２室形成凹部１６ｃとを連通している。 The first intermediate housing 16 has a plurality of through holes 16b. Each through-hole 16 b is located at a portion near the outer periphery of the first intermediate housing 16 . Each through hole 16b penetrates through the first intermediate housing 16 . A second chamber-forming concave portion 16 c is formed on the outer surface of the first intermediate housing 16 on the side opposite to the thrust bearing accommodating chamber 25 . The second chamber forming recess 16c communicates with the shaft insertion hole 16a. Each through hole 16b communicates the thrust bearing housing chamber 25 with the second chamber forming recess 16c.
　作動体ハウジング１３は、第１中間ハウジング１６に連結されている。作動体ハウジング１３は、流体を吐出する吐出孔１３ｈを有している。吐出孔１３ｈは、作動体ハウジング１３から流体を吐出する。 The actuator housing 13 is connected to the first intermediate housing 16 . The operating body housing 13 has a discharge hole 13h for discharging fluid. 13 h of discharge holes discharge the fluid from the actuator housing 13. As shown in FIG.
　＜モータ４０の構成＞
　流体機械１０は、モータ４０を備えている。モータ４０は、モータ室１８に収容されている。モータ４０は、ステータ４１と、ロータ４２と、を有している。ステータ４１は、モータハウジング１２の周壁１２ｂに固定されている。ステータ４１は、筒状のステータコア４３と、コイル４４と、を有している。ステータコア４３は、モータハウジング１２の周壁１２ｂの内周面１２１ｂに固定されている。コイル４４は、ステータコア４３に巻回されている。モータ４０は、コイルエンド４４ｅを有している。コイルエンド４４ｅは、コイル４４の一部であるとともにステータコア４３の第１端面４３ａ及び第２端面４３ｂからそれぞれ突出している。 <Configuration of Motor 40>
The fluid machine 10 has a motor 40 . A motor 40 is housed in the motor chamber 18 . The motor 40 has a stator 41 and a rotor 42 . The stator 41 is fixed to the peripheral wall 12b of the motor housing 12. As shown in FIG. The stator 41 has a cylindrical stator core 43 and coils 44 . The stator core 43 is fixed to the inner peripheral surface 121b of the peripheral wall 12b of the motor housing 12. As shown in FIG. Coil 44 is wound around stator core 43 . The motor 40 has a coil end 44e. The coil ends 44e are part of the coil 44 and protrude from the first end surface 43a and the second end surface 43b of the stator core 43, respectively.
　＜ロータ４２の構成＞
　ロータ４２は、筒部材４６と、磁性体である永久磁石４７と、軸部材４８と、を有している。筒部材４６は、例えば、ステンレス鋼により形成されている。筒部材４６は、例えば、ＳＵＳ３１６により形成されている。筒部材４６は、円筒状の筒部４９を有している。したがって、ロータ４２は、筒部４９を有している。 <Configuration of Rotor 42>
The rotor 42 has a tubular member 46 , a permanent magnet 47 that is a magnetic material, and a shaft member 48 . The cylindrical member 46 is made of stainless steel, for example. The cylindrical member 46 is made of SUS316, for example. The cylindrical member 46 has a cylindrical cylindrical portion 49 . Therefore, the rotor 42 has a tubular portion 49 .
　永久磁石４７は、中実円柱状である。永久磁石４７は、筒部４９の内周面４９１に圧入されている。これにより、永久磁石４７は、筒部４９の内周面４９１に固定されている。永久磁石４７の軸心は、筒部４９の軸心と一致している。永久磁石４７における軸方向の長さは、筒部４９における軸方向の長さよりも短い。永久磁石４７の軸方向における第１端面４７ａと第２端面４７ｂとは、平坦面状である。第１端面４７ａと第２端面４７ｂとは、軸方向に対して直交する方向に延びている。永久磁石４７は、永久磁石４７の径方向に着磁されている。 The permanent magnet 47 has a solid cylindrical shape. The permanent magnet 47 is press-fitted into the inner peripheral surface 491 of the cylindrical portion 49 . Thereby, the permanent magnet 47 is fixed to the inner peripheral surface 491 of the cylindrical portion 49 . The axis of the permanent magnet 47 coincides with the axis of the tubular portion 49 . The axial length of the permanent magnet 47 is shorter than the axial length of the cylindrical portion 49 . A first end surface 47a and a second end surface 47b in the axial direction of the permanent magnet 47 are flat surfaces. The first end surface 47a and the second end surface 47b extend in a direction orthogonal to the axial direction. The permanent magnets 47 are magnetized in the radial direction of the permanent magnets 47 .
　永久磁石４７の第１端面４７ａは、筒部４９の内周面４９１の内側に位置している。よって、筒部４９の軸方向の一端部４９ａは、永久磁石４７の第１端面４７ａから突出している。永久磁石４７の第２端面４７ｂは、筒部４９の内周面４９１の内側に位置している。よって、筒部４９の軸方向の他端部４９ｂは、永久磁石４７の第２端面４７ｂから突出している。 The first end surface 47a of the permanent magnet 47 is located inside the inner peripheral surface 491 of the cylindrical portion 49. Accordingly, one axial end 49 a of the cylindrical portion 49 protrudes from the first end face 47 a of the permanent magnet 47 . A second end surface 47 b of the permanent magnet 47 is located inside the inner peripheral surface 491 of the cylindrical portion 49 . Therefore, the other axial end portion 49 b of the cylindrical portion 49 protrudes from the second end surface 47 b of the permanent magnet 47 .
　筒部４９の軸方向の長さは、ステータコア４３の軸方向の長さよりも長い。筒部４９の一端部４９ａは、ステータコア４３の第１端面４３ａに対して突出している。筒部４９の他端部４９ｂは、ステータコア４３の第２端面４３ｂに対して突出している。ロータ４２は、ステータ４１の径方向内側に配置されている。 The axial length of the cylindrical portion 49 is longer than the axial length of the stator core 43 . One end portion 49 a of the cylindrical portion 49 protrudes from the first end surface 43 a of the stator core 43 . The other end portion 49b of the tubular portion 49 protrudes from the second end surface 43b of the stator core 43 . The rotor 42 is arranged radially inside the stator 41 .
　軸部材４８は、筒部４９の一端部４９ａに設けられている。軸部材４８は、鉄製である。軸部材４８は、圧入部４８ａと、フランジ部４８ｂと、軸部４８ｃと、プレート部４８ｄと、を有している。圧入部４８ａは、円柱状である。圧入部４８ａは、筒部４９の一端部４９ａに圧入されている。よって、軸部材４８は、筒部４９の一端部４９ａに固定されている。軸部材４８の軸線は、永久磁石４７の軸線と一致している。 The shaft member 48 is provided at one end portion 49 a of the tubular portion 49 . The shaft member 48 is made of iron. The shaft member 48 has a press-fit portion 48a, a flange portion 48b, a shaft portion 48c, and a plate portion 48d. The press-fit portion 48a has a cylindrical shape. The press-fitting portion 48 a is press-fitted into one end portion 49 a of the tubular portion 49 . Therefore, the shaft member 48 is fixed to one end portion 49 a of the tubular portion 49 . The axis of the shaft member 48 coincides with the axis of the permanent magnet 47 .
　フランジ部４８ｂは、円柱状である。フランジ部４８ｂは、圧入部４８ａにおける永久磁石４７とは反対側の端部に連続している。フランジ部４８ｂの外径は、圧入部４８ａの外径よりも大きい。軸部４８ｃは、円柱状である。軸部４８ｃは、フランジ部４８ｂにおける永久磁石４７とは反対側の端部に連続している。軸部４８ｃの外径は、フランジ部４８ｂの外径よりも小さい。 The flange portion 48b is cylindrical. The flange portion 48b is continuous with the end portion of the press-fitting portion 48a on the side opposite to the permanent magnet 47 . The outer diameter of the flange portion 48b is larger than the outer diameter of the press-fitting portion 48a. The shaft portion 48c is cylindrical. The shaft portion 48c is continuous with the end portion of the flange portion 48b opposite to the permanent magnet 47 . The outer diameter of the shaft portion 48c is smaller than the outer diameter of the flange portion 48b.
　プレート部４８ｄは、スラスト軸受収容室２５に配置されている。プレート部４８ｄは、フランジ部４８ｂの外周面４８０ｂから環状をなすように突出している。プレート部４８ｄの外径は、筒部４９の外径よりも大きい。したがって、プレート部４８ｄは、筒部４９よりも径方向外側に突出している。プレート部４８ｄは、フランジ部４８ｂと一体的に回転可能である。 The plate portion 48d is arranged in the thrust bearing housing chamber 25. The plate portion 48d protrudes in an annular shape from the outer peripheral surface 480b of the flange portion 48b. The outer diameter of the plate portion 48 d is larger than the outer diameter of the cylinder portion 49 . Therefore, the plate portion 48 d protrudes radially outward from the cylindrical portion 49 . The plate portion 48d is rotatable integrally with the flange portion 48b.
　図２及び図３に示すように、筒部材４６は、底壁部５０を有している。したがって、ロータ４２は、底壁部５０をさらに有している。底壁部５０は、筒部４９の他端部４９ｂから連続して延びている。したがって、底壁部５０は、筒部４９と一体である。底壁部５０は、筒部４９と一体形成されている。したがって、底壁部５０は、ステンレス鋼により形成されている。底壁部５０は、ＳＵＳ３１６により形成されている。 As shown in FIGS. 2 and 3, the cylindrical member 46 has a bottom wall portion 50. As shown in FIGS. Therefore, the rotor 42 further has a bottom wall portion 50 . The bottom wall portion 50 extends continuously from the other end portion 49 b of the tubular portion 49 . Therefore, the bottom wall portion 50 is integrated with the tubular portion 49 . The bottom wall portion 50 is integrally formed with the tubular portion 49 . Therefore, the bottom wall portion 50 is made of stainless steel. The bottom wall portion 50 is made of SUS316.
　底壁部５０は、略円板状である。底壁部５０は、内端面５０１と外端面５０２とを有する。内端面５０１は、永久磁石４７の第２端面４７ｂと対向している。また、底壁部５０は、外周面５００を有している。外周面５００は、平坦面状である。外周面５００は、テーパ状である。外周面５００は、筒部４９の他端部４９ｂから軸方向に離間するにつれて外径が小さくなっている。したがって、底壁部５０は、筒部４９よりも筒部４９の径方向内側に向かって延在している。外周面５００は、筒部４９の周方向の全周に亘って延びている。したがって、底壁部５０は、筒部４９の周方向の全周に亘って延びている。底壁部５０の厚さＴ１は、筒部４９の厚さＴ２よりも厚い。本実施形態では、筒部材４６が深絞り加工によって形成されることで、筒部材４６に底壁部５０が形成されている。 The bottom wall portion 50 is substantially disc-shaped. The bottom wall portion 50 has an inner end surface 501 and an outer end surface 502 . The inner end face 501 faces the second end face 47 b of the permanent magnet 47 . Also, the bottom wall portion 50 has an outer peripheral surface 500 . The outer peripheral surface 500 is flat. The outer peripheral surface 500 is tapered. The outer diameter of the outer peripheral surface 500 decreases with distance from the other end 49b of the cylindrical portion 49 in the axial direction. Therefore, the bottom wall portion 50 extends radially inward of the tubular portion 49 from the tubular portion 49 . The outer peripheral surface 500 extends along the entire circumference of the cylindrical portion 49 . Therefore, the bottom wall portion 50 extends over the entire circumference of the tubular portion 49 in the circumferential direction. The thickness T1 of the bottom wall portion 50 is thicker than the thickness T2 of the tubular portion 49 . In this embodiment, the bottom wall portion 50 is formed in the cylindrical member 46 by forming the cylindrical member 46 by deep drawing.
　筒部４９の他端部４９ｂ内には、空間部Ｓ１が形成されている。空間部Ｓ１は、筒部４９の内周面４９１と、永久磁石４７の第２端面４７ｂと、底壁部５０の内端面５０１と、から区画されている。したがって、底壁部５０は、筒部４９よりも筒部４９の径方向内側に向かって延在する。底壁部５０は、筒部４９及び永久磁石４７と共に空間部Ｓ１を区画している。本実施形態では、底壁部５０は、空間部Ｓ１を閉塞している。 A space portion S1 is formed in the other end portion 49b of the cylindrical portion 49. As shown in FIG. The space S<b>1 is defined by the inner peripheral surface 491 of the tubular portion 49 , the second end surface 47 b of the permanent magnet 47 , and the inner end surface 501 of the bottom wall portion 50 . Therefore, the bottom wall portion 50 extends radially inward of the tubular portion 49 from the tubular portion 49 . The bottom wall portion 50 defines a space portion S1 together with the cylindrical portion 49 and the permanent magnets 47 . In this embodiment, the bottom wall portion 50 closes the space S1.
　＜第１ラジアル軸受２０及び第２ラジアル軸受２２の構成＞
　図１に示すように、第１ラジアル軸受２０は、筒部４９の一端部４９ａを回転可能に支持している。第２ラジアル軸受２２は、筒部４９の他端部４９ｂを回転可能に支持している。第１ラジアル軸受２０及び第２ラジアル軸受２２は気体軸受であり、ロータ４２の回転速度が第１ラジアル軸受２０及び第２ラジアル軸受２２により筒部４９が浮上する浮上回転速度に達するまでは、筒部４９と接触した状態で筒部４９を支持する。そして、ロータ４２の回転速度が浮上回転速度に達すると、筒部４９と第１ラジアル軸受２０との間、及び筒部４９と第２ラジアル軸受２２との間に生じる動圧によって、筒部４９は、第１ラジアル軸受２０及び第２ラジアル軸受２２に対して浮上する。これにより、筒部４９は、第１ラジアル軸受２０及び第２ラジアル軸受２２に対して非接触の状態で回転可能に支持される。したがって、第１ラジアル軸受２０及び第２ラジアル軸受２２は、ロータ４２を回転可能に支持する。第２ラジアル軸受２２は、空間部Ｓ１の径方向外側に設けられている。したがって、第２ラジアル軸受２２は、ロータ４２を回転可能に支持するとともに、空間部Ｓ１の径方向外側に設けられるラジアル軸受である。 <Configuration of First Radial Bearing 20 and Second Radial Bearing 22>
As shown in FIG. 1, the first radial bearing 20 rotatably supports one end portion 49a of the cylindrical portion 49. As shown in FIG. The second radial bearing 22 rotatably supports the other end portion 49b of the tubular portion 49 . The first radial bearing 20 and the second radial bearing 22 are gas bearings. It supports the tubular portion 49 while in contact with the portion 49 . Then, when the rotation speed of the rotor 42 reaches the floating rotation speed, dynamic pressure generated between the tubular portion 49 and the first radial bearing 20 and between the tubular portion 49 and the second radial bearing 22 causes the tubular portion 49 to move. floats against the first radial bearing 20 and the second radial bearing 22 . Thereby, the cylindrical portion 49 is rotatably supported in a non-contact state with respect to the first radial bearing 20 and the second radial bearing 22 . Therefore, the first radial bearing 20 and the second radial bearing 22 rotatably support the rotor 42 . The second radial bearing 22 is provided radially outside the space S1. Therefore, the second radial bearing 22 is a radial bearing that rotatably supports the rotor 42 and is provided radially outside the space S1.
　＜スラスト軸受５１の構成＞
　第１中間ハウジング１６とプレート部４８ｄとの間、及び第２中間ハウジング１７とプレート部４８ｄとの間には、気体軸受であるスラスト軸受５１がそれぞれ配置されている。ロータ４２の回転に伴ってプレート部４８ｄが回転すると、プレート部４８ｄと両スラスト軸受５１との間に動圧が生じる。これにより、両スラスト軸受５１によって、プレート部４８ｄが両スラスト軸受５１に対して浮上し、ロータ４２が両スラスト軸受５１に対して非接触の状態で回転可能に支持される。 <Configuration of Thrust Bearing 51>
Thrust bearings 51, which are gas bearings, are arranged between the first intermediate housing 16 and the plate portion 48d and between the second intermediate housing 17 and the plate portion 48d. When the plate portion 48 d rotates with the rotation of the rotor 42 , dynamic pressure is generated between the plate portion 48 d and both thrust bearings 51 . As a result, the plate portion 48 d is floated with respect to the thrust bearings 51 by the thrust bearings 51 , and the rotor 42 is rotatably supported without contact with the thrust bearings 51 .
　＜作動体Ａ１の構成＞
　流体機械１０は、作動体Ａ１を備えている。作動体Ａ１は、作動体ハウジング１３に収容されている。作動体Ａ１は、作動体ハウジング１３内に挿通された軸部材４８に連結されている。 <Structure of Actuator A1>
The fluid machine 10 includes an operating body A1. The actuator A<b>1 is housed in the actuator housing 13 . The actuator A<b>1 is connected to a shaft member 48 inserted through the actuator housing 13 .
　流体機械１０において、流体は吸入孔１２ｈからモータ室１８に吸入される。モータ室１８に吸入された流体は、各貫通孔２３、スラスト軸受収容室２５、各貫通孔１６ｂ、及び第２室形成凹部１６ｃの内側を通過して、作動体ハウジング１３内に吸入される。作動体Ａ１の回転により流体は、作動体ハウジング１３から吐出孔１３ｈを介して吐出される。したがって、作動体Ａ１は、ハウジング１１内にて流体を吸入して吐出する。 In the fluid machine 10, the fluid is sucked into the motor chamber 18 through the suction hole 12h. The fluid sucked into the motor chamber 18 passes through the through holes 23 , the thrust bearing housing chamber 25 , the through holes 16 b , and the second chamber forming recess 16 c and is sucked into the actuator housing 13 . Fluid is discharged from the actuator housing 13 through the discharge hole 13h by the rotation of the actuator A1. Accordingly, the working body A1 draws and discharges fluid within the housing 11 .
　＜作用＞
　次に、本実施形態の作用について説明する。
　ロータ４２は、底壁部５０を有しているため、ロータ４２が底壁部５０を有していない場合に比べて、筒部４９の他端部４９ｂの強度が向上している。したがって、例えば、筒部４９の他端部４９ｂがラジアル荷重を受けたとしても、筒部４９の他端部４９ｂが変形し難い。 <Action>
Next, the operation of this embodiment will be described.
Since the rotor 42 has the bottom wall portion 50 , the strength of the other end portion 49 b of the cylindrical portion 49 is improved as compared with the case where the rotor 42 does not have the bottom wall portion 50 . Therefore, for example, even if the other end portion 49b of the tubular portion 49 receives a radial load, the other end portion 49b of the tubular portion 49 is less likely to deform.
　また、作業者がこのようなロータ４２を備えた流体機械１０を組み付ける際には、作業者は、筒部４９の一端部４９ａに軸部材４８を固定した後に、ロータ４２を第１ラジアル軸受２０、ステータコア４３の内側、及び第２ラジアル軸受２２に対して挿入する場合がある。このとき、筒部４９の一端部４９ａに固定された軸部材４８は、プレート部４８ｄを有している。このため、作業者がロータ４２を第１ラジアル軸受２０、ステータコア４３の内側、及び第２ラジアル軸受２２に対して挿入する際には、作業者は、筒部４９の他端部４９ｂからロータ４２を第１ラジアル軸受２０、ステータコア４３の内側、及び第２ラジアル軸受２２に対して挿入する必要がある。 Further, when an operator assembles the fluid machine 10 having such a rotor 42 , the operator fixes the shaft member 48 to the one end portion 49 a of the cylindrical portion 49 and then attaches the rotor 42 to the first radial bearing 20 . , the inside of the stator core 43 and the second radial bearing 22 . At this time, the shaft member 48 fixed to the one end portion 49a of the cylindrical portion 49 has a plate portion 48d. Therefore, when an operator inserts the rotor 42 into the first radial bearing 20 , the inside of the stator core 43 , and the second radial bearing 22 , the operator inserts the rotor 42 from the other end 49 b of the cylindrical portion 49 . should be inserted into the first radial bearing 20 , the inside of the stator core 43 and the second radial bearing 22 .
　ここで、底壁部５０は、テーパ状の外周面５００を有し、外周面５００は、筒部４９の他端部４９ｂから筒部４９の軸方向に離間するにつれて外径が小さくなっている。つまり、ロータ４２における筒部４９の他端部４９ｂに対応する端部が先細りしている。このため、作業者は、筒部４９の他端部４９ｂに対応する端部からロータ４２を第１ラジアル軸受２０、ステータコア４３の内側、及び第２ラジアル軸受２２に対して挿入し易い。その結果、流体機械１０の組付け作業性が向上する。 Here, the bottom wall portion 50 has a tapered outer peripheral surface 500, and the outer diameter of the outer peripheral surface 500 becomes smaller as the distance from the other end portion 49b of the tubular portion 49 in the axial direction of the tubular portion 49 increases. . That is, the end portion of the rotor 42 corresponding to the other end portion 49b of the tubular portion 49 is tapered. Therefore, the operator can easily insert the rotor 42 into the first radial bearing 20 , the inside of the stator core 43 , and the second radial bearing 22 from the end corresponding to the other end 49 b of the cylindrical portion 49 . As a result, the assembling workability of the fluid machine 10 is improved.
　＜効果＞
　本実施形態では、以下の効果を得ることができる。
　（１）ロータ４２は、底壁部５０を有している。これによれば、ロータ４２が底壁部５０を有していない場合に比べて、筒部４９の他端部４９ｂの強度を向上させることができる。したがって、例えば、筒部４９の他端部４９ｂにラジアル荷重を受けたとしても、筒部４９の他端部４９ｂが変形し難くなるため、ロータ４２の耐久性を向上させることができる。また、底壁部５０は、テーパ状の外周面５００を有し、外周面５００は、筒部４９の他端部４９ｂから筒部４９の軸方向に離間するにつれて外径が小さくなっている。つまり、ロータ４２における筒部４９の他端部４９ｂに対応する端部が先細りしている。したがって、作業者は、筒部４９の他端部４９ｂに対応する端部からロータ４２を第２ラジアル軸受２２に対して挿入し易くなる。その結果、流体機械１０の組み付け作業性を向上させることができる。以上により、ロータ４２の耐久性を向上させつつも、組み付け作業性を向上させることができる。 <effect>
The following effects can be obtained in this embodiment.
(1) The rotor 42 has a bottom wall portion 50 . According to this, the strength of the other end portion 49b of the tubular portion 49 can be improved as compared with the case where the rotor 42 does not have the bottom wall portion 50 . Therefore, for example, even if the other end portion 49b of the tubular portion 49 receives a radial load, the other end portion 49b of the tubular portion 49 is less likely to deform, so the durability of the rotor 42 can be improved. Further, the bottom wall portion 50 has a tapered outer peripheral surface 500 , and the outer diameter of the outer peripheral surface 500 decreases as the distance from the other end portion 49 b of the tubular portion 49 in the axial direction of the tubular portion 49 increases. That is, the end portion of the rotor 42 corresponding to the other end portion 49b of the tubular portion 49 is tapered. Therefore, the operator can easily insert the rotor 42 into the second radial bearing 22 from the end corresponding to the other end 49 b of the cylindrical portion 49 . As a result, workability of assembling the fluid machine 10 can be improved. As described above, it is possible to improve the assembling workability while improving the durability of the rotor 42 .
　（２）底壁部５０は、筒部４９の周方向の全周に亘って延びている。これによれば、底壁部５０が筒部４９の周方向の一部においてのみ延びている場合に比べて、筒部４９の他端部４９ｂの強度をさらに向上させることができる。したがって、筒部４９の他端部４９ｂがさらに変形し難くなるため、ロータ４２の耐久性をさらに向上させることができる。 (2) The bottom wall portion 50 extends over the entire circumference of the cylinder portion 49 in the circumferential direction. According to this, the strength of the other end portion 49b of the tubular portion 49 can be further improved compared to the case where the bottom wall portion 50 extends only in a part of the tubular portion 49 in the circumferential direction. Therefore, since the other end portion 49b of the cylindrical portion 49 is more difficult to deform, the durability of the rotor 42 can be further improved.
　（３）底壁部５０の厚さＴ１は、筒部４９の厚さＴ２よりも厚い。これによれば、底壁部５０の厚さＴ１が筒部４９の厚さＴ２以下である場合に比べて、底壁部５０の強度を向上させることができる。その結果、筒部４９の他端部４９ｂがさらに変形し難くなるため、ロータ４２の耐久性をさらに向上させることができる。また、筒部４９の厚さＴ２が薄いほど、筒部４９で発生する渦電流損を低減することができるため、モータ効率を向上させることができる。 (3) The thickness T1 of the bottom wall portion 50 is thicker than the thickness T2 of the tubular portion 49 . According to this, the strength of the bottom wall portion 50 can be improved compared to the case where the thickness T1 of the bottom wall portion 50 is equal to or less than the thickness T2 of the tubular portion 49 . As a result, the other end portion 49b of the cylindrical portion 49 is more difficult to deform, so the durability of the rotor 42 can be further improved. In addition, the thinner the thickness T2 of the cylindrical portion 49, the more the eddy current loss generated in the cylindrical portion 49 can be reduced, so the motor efficiency can be improved.
　（４）底壁部５０は、空間部Ｓ１を閉塞している。これによれば、底壁部５０が空間部Ｓ１を閉塞していない場合に比べて、底壁部５０の強度を向上させることができる。その結果、筒部４９の他端部４９ｂがさらに変形し難くなるため、ロータ４２の耐久性をさらに向上させることができる。 (4) The bottom wall portion 50 closes the space portion S1. According to this, the strength of the bottom wall portion 50 can be improved compared to the case where the bottom wall portion 50 does not block the space portion S1. As a result, the other end portion 49b of the cylindrical portion 49 is more difficult to deform, so the durability of the rotor 42 can be further improved.
　（５）筒部材４６が深絞り加工によって形成されることにより、筒部材４６に底壁部５０が形成されている。これによれば、例えば、筒部４９の他端部４９ｂに、筒部４９とは別体である底壁部５０を溶接する場合に比べて、製造工程を簡素化することができる。また、筒部材４６を深絞り加工によって形成するため、材料の加工硬化によって筒部４９の他端部４９ｂの強度を向上させることができる。 (5) The bottom wall portion 50 is formed in the cylindrical member 46 by forming the cylindrical member 46 by deep drawing. According to this, for example, the manufacturing process can be simplified as compared with the case where the bottom wall portion 50 which is separate from the tubular portion 49 is welded to the other end portion 49b of the tubular portion 49 . Further, since the cylindrical member 46 is formed by deep drawing, the strength of the other end portion 49b of the cylindrical portion 49 can be improved by work hardening of the material.
　＜変更例＞
　なお、上記実施形態は、以下のように変更して実施することができる。上記実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。 <Change example>
It should be noted that the above embodiment can be implemented with the following modifications. The above embodiments and the following modifications can be combined with each other within a technically consistent range.
　○　図４及び図５に示すように、筒部材４６の他端部４９ｂが筒部４９の径方向内側に折り曲げられることにより、底壁部６０が形成されてもよい。このとき、底壁部６０は、空間部Ｓ１を閉塞していない。なお、図４では、折り曲げられる前の筒部４９の他端部４９ｂを二点鎖線で図示している。底壁部６０は、筒部４９の周方向の全周に亘って延びている。底壁部６０は、外周面６００を有している。外周面６００は、テーパ状である。外周面６００は、筒部４９の他端部４９ｂよりも小さい外径を有するとともに、筒部４９の他端部４９ｂから筒部４９の軸方向に離間するにつれて外径が小さくなっている。したがって、ロータ４２における筒部４９の他端部４９ｂに対応する端部が先細りしている。 ○ As shown in FIGS. 4 and 5 , the bottom wall portion 60 may be formed by bending the other end portion 49 b of the tubular member 46 radially inwardly of the tubular portion 49 . At this time, the bottom wall portion 60 does not block the space portion S1. In addition, in FIG. 4, the other end portion 49b of the tubular portion 49 before being bent is illustrated by a chain double-dashed line. The bottom wall portion 60 extends over the entire circumference of the cylinder portion 49 in the circumferential direction. The bottom wall portion 60 has an outer peripheral surface 600 . The outer peripheral surface 600 is tapered. The outer peripheral surface 600 has an outer diameter smaller than that of the other end portion 49 b of the tubular portion 49 , and the outer diameter decreases with distance from the other end portion 49 b of the tubular portion 49 in the axial direction of the tubular portion 49 . Therefore, the end portion of the rotor 42 corresponding to the other end portion 49b of the tubular portion 49 is tapered.
　○　図６及び図７に示すように、底壁部５０は、空間部Ｓ１に流体を導入する連通孔５０ｈを有していてもよい。連通孔５０ｈは、吸入孔１２ｈからモータ室１８に吸入された流体の一部を空間部Ｓ１に導入する。これによれば、連通孔５０ｈを介して空間部Ｓ１に導入された流体によって永久磁石４７が冷却される。したがって、ロータ４２の耐久性をさらに向上させることができる。 ○As shown in FIGS. 6 and 7, the bottom wall portion 50 may have a communication hole 50h for introducing fluid into the space portion S1. The communication hole 50h introduces part of the fluid sucked into the motor chamber 18 from the suction hole 12h into the space S1. According to this, the permanent magnet 47 is cooled by the fluid introduced into the space S1 through the communication hole 50h. Therefore, durability of the rotor 42 can be further improved.
　なお、連通孔５０ｈは、吸入孔１２ｈからモータ室１８に吸入された流体の一部を空間部Ｓ１に導入しなくてもよい。例えば、連通孔５０ｈに冷却流路が接続されていてもよい。 It should be noted that the communication hole 50h does not have to introduce part of the fluid sucked into the motor chamber 18 from the suction hole 12h into the space S1. For example, a cooling channel may be connected to the communication hole 50h.
　○　図８に示すように、底壁部５０は、第２ラジアル軸受２２の径方向内側に位置していてもよい。例えば、第１ラジアル軸受２０及び第２ラジアル軸受２２の位置が一義的に決められている場合を考える。このとき、底壁部５０が第２ラジアル軸受２２の径方向内側に位置している。このため、例えば、底壁部５０が第２ラジアル軸受２２から突出するように筒部４９が第２ラジアル軸受２２の内側を通過して延びている場合に比べて、筒部４９における軸方向の長さが短くなっている。その結果、ロータ４２の一次共振回転速度の低下を抑制することができる。また、例えば、ロータ４２が第２ラジアル軸受２２に対して傾いたとしても、底壁部５０の外周面５００がテーパ状であるため、底壁部５０が第２ラジアル軸受２２の内周面２２０に対して角当たりしない。 ○As shown in FIG. 8 , the bottom wall portion 50 may be positioned radially inside the second radial bearing 22 . For example, consider a case where the positions of the first radial bearing 20 and the second radial bearing 22 are uniquely determined. At this time, the bottom wall portion 50 is located radially inside the second radial bearing 22 . For this reason, for example, compared to the case where the cylindrical portion 49 extends through the inner side of the second radial bearing 22 so that the bottom wall portion 50 protrudes from the second radial bearing 22, the axial direction of the cylindrical portion 49 is reduced. shorter in length. As a result, a decrease in the primary resonance rotational speed of the rotor 42 can be suppressed. Further, for example, even if the rotor 42 is tilted with respect to the second radial bearing 22 , since the outer peripheral surface 500 of the bottom wall portion 50 has a tapered shape, the bottom wall portion 50 is inclined to the inner peripheral surface 220 of the second radial bearing 22 . Don't hit the corner.
　○　実施形態において、底壁部５０は、筒部４９の周方向の一部においてのみ延びていてもよい。
　○　実施形態において、底壁部５０の厚さＴ１は、筒部４９の厚さＴ２と等しくてもよい。 O In the embodiment, the bottom wall portion 50 may extend only in a part of the cylindrical portion 49 in the circumferential direction.
O In the embodiment, the thickness T1 of the bottom wall portion 50 may be equal to the thickness T2 of the tubular portion 49 .
　○　実施形態において、底壁部５０の厚さＴ１は、筒部４９の厚さＴ２よりも薄くてもよい。
　○　実施形態において、底壁部５０は、しごき加工によって形成されてもよい。 O In the embodiment, the thickness T1 of the bottom wall portion 50 may be thinner than the thickness T2 of the tubular portion 49 .
O In an embodiment, bottom wall part 50 may be formed by ironing.
　○　実施形態において、筒部４９及び底壁部５０は、例えば、ＳＵＳ３０４のようなオーステナイト系のステンレス鋼により形成されていてもよい。
　○　実施形態において、筒部４９の底壁部５０は、ロータ４２のアンバランス量を低減するために一部切り欠かれてもよい。 (circle) in embodiment, the cylinder part 49 and the bottom wall part 50 may be formed with the austenitic stainless steel like SUS304, for example.
(circle) in embodiment, the bottom wall part 50 of the cylinder part 49 may be partially notched in order to reduce the unbalance amount of the rotor 42. FIG.
　○　実施形態において、底壁部５０の外周面５００は、例えば、湾曲面状であってもよい。要は、底壁部５０は、テーパ状の外周面を有し、外周面は、筒部４９の他端部４９ｂよりも小さい外径を有するとともに、筒部４９の他端部４９ｂから筒部４９の軸方向に離間するにつれて外径が小さくなっていればよい。 ○ In the embodiment, the outer peripheral surface 500 of the bottom wall portion 50 may be curved, for example. In short, the bottom wall portion 50 has a tapered outer peripheral surface, and the outer peripheral surface has an outer diameter smaller than that of the other end portion 49b of the tubular portion 49. It is only necessary that the outer diameter becomes smaller as it is spaced apart in the axial direction of 49 .
　○　実施形態において、作動体Ａ１は、底壁部５０に取り付けられていてもよい。
　○　実施形態において、流体機械１０は、自動車に搭載されていなくてもよく、その他の用途で用いられるものであってもよい。 O In the embodiment, the operating body A1 may be attached to the bottom wall portion 50 .
O In the embodiment, the fluid machine 10 may not be mounted on an automobile, and may be used for other purposes.
　○　実施形態において、永久磁石４７に代えて、例えば、積層コア、アモルファスコア、又は圧粉コア等の磁性体を用いてもよい。 ○　In the embodiment, instead of the permanent magnet 47, for example, a magnetic body such as a laminated core, an amorphous core, or a dust core may be used.

Claims (6)

  1. 　ハウジングと、
    　前記ハウジング内にて流体を吸入して吐出する作動体と、
    　前記ハウジングに収容されるとともに前記作動体を回転させるモータと、を備える流体機械であって、
    　前記モータは、
    　　前記ハウジングの内周面に固定される筒状のステータコアを有するステータと、
    　　前記ステータの径方向内側に配置されるロータと、
    　　前記ロータを回転可能に支持するラジアル軸受と、を有し、
    　前記ロータは、
    　　軸方向の一端部と他端部とを有する筒部と、
    　　前記筒部の内周面に固定された磁性体と、
    　　前記筒部の一端部に固定された軸部材と、を有し、
    　前記軸部材は、前記筒部よりも前記径方向外側に突出する環状のプレート部を有し、
    　前記流体機械は、前記プレート部を回転可能に支持するスラスト軸受をさらに備え、
    　前記筒部の他端部内には、空間部が形成され、
    　前記ラジアル軸受は、前記空間部の径方向外側に位置しており、
    　前記ロータは、前記筒部の他端部から連続して延在する底壁部を有しており、
    　該底壁部は、前記筒部よりも前記径方向内側に向かって延在しており、
    　前記底壁部は、前記筒部及び前記磁性体と共に前記空間部を区画し、
    　前記底壁部は、テーパ状の外周面を有し、
    　前記外周面は、前記筒部の他端部から前記軸方向に離間するにつれて外径が小さくなっている流体機械。     a housing;
    an operating body for sucking and discharging a fluid in the housing;
    a motor housed in the housing and rotating the operating body, the fluid machine comprising:
    The motor is
    a stator having a cylindrical stator core fixed to the inner peripheral surface of the housing;
    a rotor disposed radially inside the stator;
    a radial bearing that rotatably supports the rotor;
    The rotor is
    a tubular portion having one axial end and the other axial end;
    a magnetic body fixed to the inner peripheral surface of the cylindrical portion;
    and a shaft member fixed to one end of the tubular portion,
    The shaft member has an annular plate portion projecting radially outward from the tubular portion,
    The fluid machine further includes a thrust bearing that rotatably supports the plate portion,
    A space is formed in the other end of the cylindrical portion,
    The radial bearing is positioned radially outward of the space,
    The rotor has a bottom wall portion continuously extending from the other end of the tubular portion,
    The bottom wall portion extends toward the inner side in the radial direction from the cylinder portion,
    The bottom wall portion partitions the space portion together with the cylindrical portion and the magnetic body,
    The bottom wall portion has a tapered outer peripheral surface,
    A fluid machine in which the outer diameter of the outer peripheral surface decreases with increasing distance from the other end of the cylindrical portion in the axial direction.
  2. 　前記底壁部は、前記筒部の周方向の全周に亘って延びている、請求項１に記載の流体機械。 The fluid machine according to claim 1, wherein the bottom wall portion extends along the entire circumferential direction of the cylindrical portion.
  3. 　前記底壁部の厚さは、前記筒部の厚さよりも厚い、請求項１又は請求項２に記載の流体機械。 The fluid machine according to claim 1 or 2, wherein the thickness of the bottom wall portion is thicker than the thickness of the cylindrical portion.
  4. 　前記底壁部は、前記ラジアル軸受の径方向内側に位置している、請求項１～請求項３のいずれか一項に記載の流体機械。 The fluid machine according to any one of claims 1 to 3, wherein the bottom wall portion is positioned radially inside the radial bearing.
  5. 　前記底壁部は、前記空間部を閉塞している、請求項１～請求項４のいずれか一項に記載の流体機械。 The fluid machine according to any one of claims 1 to 4, wherein the bottom wall closes the space.
  6. 　前記作動体は、前記軸部材に取り付けられており、
    　前記底壁部は、前記空間部に流体を導入する連通孔を有する、請求項１～請求項４のいずれか一項に記載の流体機械。     The actuating body is attached to the shaft member,
    The fluid machine according to any one of claims 1 to 4, wherein said bottom wall portion has a communication hole for introducing fluid into said space portion.
PCT/JP2022/018902 2021-07-21 2022-04-26 Fluid machine WO2023002734A1 (en)

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JP2009243515A (en) * 2008-03-28 2009-10-22 Sony Corp Bearing unit, motor using the unit, electronic device , and manufacturing method of bearing unit
JP2014047795A (en) * 2012-08-29 2014-03-17 Ihi Corp Rotary machine
JP2016032422A (en) * 2014-07-30 2016-03-07 ミネベア株式会社 Inner rotor motor
WO2020002509A1 (en) * 2018-06-29 2020-01-02 Celeroton Ag Electrical machine
JP2021027602A (en) * 2019-07-31 2021-02-22 アイシン・エィ・ダブリュ株式会社 Rotor for rotary electric machine, rotary electric machine, and manufacturing method of rotor for rotary electric machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009243515A (en) * 2008-03-28 2009-10-22 Sony Corp Bearing unit, motor using the unit, electronic device , and manufacturing method of bearing unit
JP2014047795A (en) * 2012-08-29 2014-03-17 Ihi Corp Rotary machine
JP2016032422A (en) * 2014-07-30 2016-03-07 ミネベア株式会社 Inner rotor motor
WO2020002509A1 (en) * 2018-06-29 2020-01-02 Celeroton Ag Electrical machine
JP2021027602A (en) * 2019-07-31 2021-02-22 アイシン・エィ・ダブリュ株式会社 Rotor for rotary electric machine, rotary electric machine, and manufacturing method of rotor for rotary electric machine

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