EP2873859B1 - Electric compressor and method for assembling electric compressor - Google Patents
Electric compressor and method for assembling electric compressor Download PDFInfo
- Publication number
- EP2873859B1 EP2873859B1 EP13816417.3A EP13816417A EP2873859B1 EP 2873859 B1 EP2873859 B1 EP 2873859B1 EP 13816417 A EP13816417 A EP 13816417A EP 2873859 B1 EP2873859 B1 EP 2873859B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- housing
- press
- curved surface
- guide member
- Prior art date
- Legal status (The legal status 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 status listed.)
- Not-in-force
Links
- 238000000034 method Methods 0.000 title claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 78
- 238000006073 displacement reaction Methods 0.000 claims description 40
- 230000006835 compression Effects 0.000 claims description 27
- 238000007906 compression Methods 0.000 claims description 27
- 239000002826 coolant Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 description 9
- 229910000576 Laminated steel Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
-
- 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
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
-
- 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
- F04B39/14—Provisions for readily assembling or disassembling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/0085—Prime movers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/60—Assembly methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49236—Fluid pump or compressor making
- Y10T29/49245—Vane type or other rotary, e.g., fan
Definitions
- the present invention relates to an electric compressor in which a compression unit compresses coolant by being driven by an electric motor unit.
- a general electric compressor includes an electric motor unit and a compression unit in a cylindrical housing.
- the electric motor unit controls the compression unit and the compression unit is driven by the electric motor to operate to compress coolant.
- the housing is made of aluminum for sake of weight reduction.
- the electric motor unit includes a stator in which coils are wound around a stator core and a rotor which is arranged inside the stator and which is rotated by magnetic force generated by electric current flowing through the stator.
- the stator is fixed to the inner peripheral wall of the housing and is fixed to the cylindrical housing by shrink-fitting as described in Patent Literature 1. This is because the stator and the housing have different coefficients of linear expansion and accordingly need to have a large amount of interference therebetween in view of a temperature increase in usage of the electric compressor.
- shrink-fitting is performed as follows. The housing is heated in advance and the stator core is inserted and positioned inside the heated housing. Then, the heated housing is cooled to shrink and the stator is thereby fixed to the housing.
- Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2009-228546
- the housing needs to be heated when the stator is to be fixed to the housing by shrink fitting as in Patent Literature 1, the number of steps and the cost increase. Moreover, in the shrink-fitting, the temperature of resin parts such as an insulating plate included in the stator and an O-ring included in a rotating body needs to be adjusted to be kept at or below a heat-resistant temperature, and work is cumbersome. Furthermore, securing a sufficient amount of interference is difficult.
- An object of the present invention is to provide an electric compressor and a method for assembling an electric compressor wherein a stator can be fixed to a housing without using a shrink-fitting step, the stator can be surely press-fitted into the housing with the formation of burrs (chips) being suppressed, and a sufficient amount of interference can be secured.
- An electric compressor in accordance with the invention includes: a cylindrical housing; an electric motor unit fixed inside the housing and including a stator and a rotor, the stator being fixed to the housing by a press-fitting of the stator to an inner peripheral wall of the housing and configured to generate a magnetic force upon energization of the stator, the rotor being rotatably arranged inside the stator and configured to be rotated by the magnetic force generated by the stator; a compression unit arranged in the housing and configured to be driven by a rotational drive force of the electric motor unit and compress a coolant; and a guide member attached to an outer periphery of the stator and made of a thin plate material having a guiding curved surface portion configured to guide the press-fitting of the stator to the inner peripheral wall of the housing.
- the guided curved surface portion may be a curved surface extending in a direction toward a center of the stator from an end portion of the stator from which the stator is inserted into the housing.
- the guide member provided with the guiding curved surface portion is attached to the outer periphery of the stator, and the stator is press-fitted into the housing in this attachment state.
- a corner portion of the stator thus does not come into contact with the inner peripheral wall of the housing and formation of burrs (chips) which causes failures can be prevented.
- fixation by press-fitting is possible, a complex shrink-fitting step can be eliminated.
- the guide member is made of thin plate material, it is possible to reduce an increase in weight due to attachment of the guide member and suppress an increase in cost.
- the guiding curved surface portion is a curved surface extending toward the center side of the stator. Hence, the stator can be surely guided in the press-fitting of the stator into the housing.
- the guide member may include a displacement preventing portion extending from the guiding curved surface portion and configured to prevent a displacement of the guide member in an axial direction of the guide member in the press-fitting of the stator to the inner peripheral wall of the housing.
- the displacement preventing portion of the guide member is provided.
- the stator can be surely press-fitted without the guide member being displaced in the press-fitting of the stator into the housing.
- the guide member may include: an interference portion formed in a shape elongated in an axial direction of the stator and press-fitted to the inner peripheral wall of the housing, the interference portion being connected to the guiding curved surface portion at an insertion-side end portion of the interference portion from which the interference portion is inserted into the inner peripheral wall of the housing; and a locking-holding portion provided in an end portion of the interference portion on an opposite side to the insertion-side end portion and configured to hold the stator.
- the guide member is formed of the interference portion, the guiding curved surface portion, and the locking-holding portion, and the interference portion secures a sufficient amount of interference in the press-fitting of the stator while the locking-holding portion secures the attachment state to the stator.
- the interference portion secures a sufficient amount of interference in the press-fitting of the stator while the locking-holding portion secures the attachment state to the stator.
- a plurality of the guide members may be provided, and the guide members may be attached at equal intervals along a circumferential direction of the stator.
- the guide members are attached at equal intervals in the circumferential direction of the stator. Hence, the stator can be prevented from being press-fitted in a manner inclined with respect to the housing.
- a section of the inner peripheral wall of the housing facing a non-attachment section of the outer periphery of the stator where no guide member is attached may be offset toward an outer peripheral side of the housing with a gap from the non-attachment section of the stator.
- a gap is formed between the housing and the section of the stator where no guide member is attached.
- the section where no guide member is attached does not come into contact with the housing, and chips (burrs) of housing due to contact are not formed also in the section where no guide member is attached.
- the guide member may include: a plurality of guide pieces each having the guiding curved surface portion, and a connection piece connecting the guide pieces to each other in the guiding curved surface portions.
- the guide member is formed of the plurality of guide pieces each having the guiding curved surface portion and of a connection piece connecting the guide pieces to each other, and the connecting piece connects the guide pieces in the guiding curved surface portions.
- the guide member may have a curved surface shape along a circumferential direction of the stator and include a slit formed in an axial direction of the guide member.
- the guide member has the curved surface shape along the circumferential direction of the stator, and a slit-shaped cut is formed in the axial direction of the guide member. Hence, the stator can be surely guided when the stator is press-fitted into the housing.
- a method for assembling an electric compressor in accordance with some embodiments is a method for the electric compressor including: a cylindrical housing; an electric motor unit fixed inside the housing and including a stator and a rotor, the stator being fixed to the housing by a press-fitting of the stator to an inner peripheral wall of the housing and configured to generate a magnetic force upon energization of the stator, the rotor being rotatably arranged inside the stator and configured to be rotated by the magnetic force generated by the stator; and a compression unit arranged in the housing and configured to be driven by a rotational drive force of the electric motor unit and compress a coolant.
- the method includes: attaching guide members made of a thin plate material to at least three positions of an outer periphery of the stator; and guiding a press-fitting of the stator to the inner peripheral wall of the housing by using guiding curved surface portions of the guide members as attached.
- the guide member is attached to the outer periphery of the stator and the guiding curved surface portion of the guide member guides the press-fitting of the stator into the housing. Hence, it is possible to smoothly press-fit the stator into the housing and eliminate a cumbersome shrink-fitting step.
- FIG. 1 A first embodiment of the present invention is described below in detail by using Figs. 1 to 10 .
- Figs. 1 to 7 are views for explaining an electric compressor 1 in a first embodiment of the present invention.
- Fig. 1 is a partially cutaway perspective view of the entire electric compressor 1.
- the electric compressor 1 includes a housing 2, an electric motor unit 3, a compression unit 4, and a drive circuit unit 5.
- the housing 2 includes a front housing 2a, a middle housing 2b, and a rear housing 2c and is formed entirely of aluminum in a substantially-cylindrical shape.
- the housings 2a, 2b, and 2c are connected to each other by bolts and the housing 2 is thereby formed to be hollow as a whole.
- the electric motor unit 3, the compression unit 4, and the drive circuit unit 5 are housed inside the housing 2.
- the drive circuit unit 5 controls the number of revolutions of the electric motor unit 3 depending on change of a thermal load of the compression unit 4 and is housed in the front housing 2a.
- the electric motor unit 3 drives the compression unit 4 and is housed in the middle housing 2b and the rear housing 2c.
- the compression unit 4 compresses coolant by being driven by rotational drive force of the electric motor unit 3 and is housed in the rear housing 2c.
- the compression unit 4 includes a cylinder block 42, a front side block 43, a rear side block 44, and a rotor 45.
- a cylinder chamber 41 having an elliptical inner wall surface is formed in the cylinder block 42.
- the front side block 43 and the rear side block 44 holds the cylinder block 42 in a sandwiched state.
- the rotor 45 is attached to a rotary drive shaft 31 extending from the electric motor unit 3 and is rotatably housed in a center portion of the cylinder chamber 41.
- the rotary drive shaft 31 extends in a left-right direction in the housing 2 and is rotatable in the housing 2 by being supported at both end portions by the middle housing 2b and the rear side block 44.
- Multiple vane grooves 47 are formed in an outer periphery of the rotor 45 at equal intervals in a circumferential direction, and a vane 46 is housed in each of the vane grooves 47 to be capable of advancing and retreating.
- Each of the vanes 46 advances and retreats from and to the corresponding vane groove 47 by receiving a centrifugal force and an oil back pressure supplied to a bottom portion of the vane groove 47 which are generated by the rotation of the rotor 45.
- Advancing of the vanes 46 causes top portions of the vanes 46 to slide along the inner wall surface of the cylinder chamber 41.
- the vanes 46 divide the cylinder chamber 41 into multiple compression chambers.
- each of the compression chambers increases and decreases with the rotation of the rotor 45 and the advancing and retreating of the vanes 46.
- An intake stroke, a compression stroke, and a discharge stroke of the coolant are repeated by the increase and decrease of the volume.
- the coolant is sucked in from an intake port.
- the discharge stroke the coolant compressed in the compression stroke is discharged from a discharge port.
- the electric motor unit 3 includes a stator 32 fixed to the rear housing 2c (hereafter referred to as housing 2) by being press-fitted into the housing 2 and a rotor 33 rotatably arranged inside the stator 32.
- stator 32 multiple coils 35 are wound around a stator core 34 having a cylindrical exterior.
- the coils 35 are wound around the stator core 34 via a thin insulator 36 made of insulating material. Magnetic force is generated upon energization of the coils 35 by supplying electricity from the drive circuit unit 5 to the coils 35.
- a rotor 33 is attached to the rotary drive shaft 31.
- Multiple permanent magnets corresponding to the coils 35 of the stator 32 are provided on an outer peripheral side of the rotor 33, and the rotor 33 rotates by receiving magnetic force from the stator 32. This rotation causes the rotary drive shaft 31 to rotate and the rotor 45 of the compression unit 4 is rotated by the rotation of the rotary drive shaft 31.
- the stator core 34 of the stator 32 is formed of laminated steel plates formed by laminating thin annular steel plates. Press-fitting the stator core 34 to an inner peripheral wall 2d of the housing 2 made of aluminum fixes the stator 32 to the housing 2. Guide members 11 are attached to the stator 32 for the press-fitting of the stator 32 to the inner peripheral wall 2d of the housing 2.
- the guide members 11 are attached to multiple positions (three positions in the embodiment) of the outer periphery of the stator 32 (stator core 34) at equal intervals in the circumferential direction.
- the guide members 11 guide the press-fitting of the stator 32 into the housing 2.
- each of the guide members 11 is formed of multiple (four) guide pieces 12 extending along a press-fitting direction (up-down direction in Fig. 4 ) and connection pieces 13 provided integrally with the guide pieces 12.
- the connection pieces 13 are provided at multiple positions (two positions) along a longitudinal direction of the guide pieces 12 and connect the adjacent guide pieces 12 to each other at multiple positions in the longitudinal direction.
- the guide member 11 as a whole is formed to have a raft shape by connecting the multiple guide pieces 12 with the connection pieces 13 as described above. Since such a guide member 11 can have an arc shape along an arc-shaped outer peripheral wall of the stator 32, attachment along an outer surface of the stator 32 is made possible.
- the guide members 11 are formed by pressing thin steel plates. This can reduce an increase in weight due to provision of the guide members 11 and also suppress an increase in cost.
- the guide pieces 12 of the guide members 11 are formed to have substantially the same length as the length, in the axial direction, of the stator 32 (stator core 34) made of laminated steel plates.
- Each of the guide pieces 12 is formed of an interference portion 14 formed to have a shape elongated in the axial direction of the stator 32, a guiding curved surface portion 15 extending from an insertion-side end portion (lower end portion located on the lower side in Figs. 4 to 7 ) of the interference portion 14, and a locking-holding portion 16 provided in an end portion (upper end portion located on the upper side in Figs. 4 to 7 ) of the interference portion 14 on the opposite side to the guiding curved surface portion 15.
- the interference portion 14 has a flat plate shape and is press-fitted to the inner peripheral wall 2d of the housing 2 when the stator 32 is press-fitted into the housing 2. Hence, the stator 32 can be press-fitted to the inner peripheral wall 2d of the housing 2 without the outer peripheral wall of the stator 32 coming into contact with the inner peripheral wall 2d of the housing 2.
- the guiding curved surface portion 15 is formed of a curved surface extending to curve from the lower end portion of the interference portion 14 toward a center side of the stator 32.
- a taper portion 17 is formed in the curved surface portion of the guiding curved surface portion 15.
- the taper portion 17 is inclined to extend linearly from the inner peripheral wall 2d of the housing 2 along the axial direction of the stator 32, and acts as a guide when the stator 32 is press-fitted into the housing 2.
- Providing such a guiding curved surface portion 15 prevents a corner portion of the stator 32 from coming into direct contact with the inner peripheral wall 2d of the housing 2 when the stator 32 is press-fitted to the inner peripheral wall 2d of the housing 2. Accordingly, no chips are formed from the housing 2. Failure due to formation of chips can be thereby prevented.
- This guiding curved surface portion 15 serves as a displacement preventing portion 18 which comes into contact with and is locked to an insertion-side end portion (lower end portion) of the stator 32.
- the displacement preventing portion 18 prevents the guide member 11 from being displaced in the axial direction in the press-fitting to the inner peripheral wall 2d of the housing 2 by coming into contact with the insertion-side end portion of the stator 32.
- the locking-holding portion 16 is formed integrally with the interference portion 14 in the end portion on the opposite side to the guiding curved surface portion 15 to extend toward the center side of the stator 32.
- the locking-holding portion 16 is curved in a U-shape from the end portion of the interference portion 14.
- the locking-holding portion 16 thus has a spring characteristic and is locked to an end portion (upper end portion) of the stator 32 on the opposite side to the insertion-side end portion by spring force. This can achieve a state where the guide member 11 is attached to the stator 32 with detachment of the guide member 11 from the stator 32 being prevented.
- sections of the inner peripheral wall 2d of the housing 2 facing the outer peripheral portion (non-attachment section) of the stator 32 where no guide members 11 are attached are formed to be offset toward the outer peripheral side (outward) of the housing 2.
- Forming offset portions 2f which are offset outward in the inner peripheral wall 2d of the housing 2 and which correspond to the sections where no guide members 11 are attached can form gaps between the stator 32 and the inner peripheral wall 2d of the housing 2 in the offset portions 2f. Accordingly, the sections of the stator 32 where no guide members 11 are attached do not come into contact with the inner peripheral wall 2d of the housing 2, and no chips of housing 2 are formed in the sections where no guide members 11 are attached.
- Figs. 5 and 6 show operations of press-fitting the stator 32 to the inner peripheral wall 2d of the housing 2.
- the guide members 11 are attached to the three positions of the outer periphery of the stator 32 at equal intervals. Attaching the guide members 11 to at least three positions allows the stator 32 to be press-fitted without being inclined.
- the attachment of each of the guide members 11 is performed by locking the locking-holding portion 16 to the upper end portion of the stator 32. As shown in Fig. 5 , in this attachment state, the guiding curved surface portion 15 of the guide member 11 extends toward the center side in the insertion-side end portion of the stator 32 and thereby covers the insertion-side end portion.
- the stator 32 is press-fitted to the inner peripheral wall 2d of the housing 2 with the guide members 11 attached as described above.
- the press-fitting since the taper portions 17 formed in the guiding curved surface portion 15 guide the press-fitting to the inner peripheral wall 2d of the housing 2, the press-fitting can be performed smoothly.
- the guiding curved surface portions 15 prevent the corner portion of the stator 32 from coming into direct contact with the inner peripheral wall 2d of the housing 2, formation of chips from the housing 2 can be prevented.
- the displacement preventing portions 18 prevent displacement of the guide members 11 in the axial direction, the guide members 11 are not displaced from the stator 32.
- a boss portion for increasing the strength of the guiding curved surface portion 15 is formed on the outer peripheral surface side of the guiding curved surface portion 15, and a portion protruding toward the inner peripheral surface side of the guiding curved surface portion 15 is formed.
- This protrusion serves as a displacement preventing portion 18a which engages with the lower end portion of the stator 32 and prevents the guide member 11 from being displaced from the stator 32.
- Fig. 7 shows a state where the press-fitting of the stator 32 is completed.
- a tapered step portion 2e is formed in the inner peripheral wall 2d of the housing 2, and the guiding curved surface portion 15 of each guide member 11 comes into contact with the step portion 2e.
- the press-fitting of the stator 32 is stopped by this contact, and the stator 32 is fixed to a predetermined position in the inner peripheral wall 2d of the housing 2.
- the elongated interference portion 14 of the guide member 11 is press-fitted to the inner peripheral wall 2d of the housing 2, a sufficient amount of interference can be secured and the stator 32 can be stably fixed to the housing 2.
- stator 32 since the stator 32 is press-fitted to the inner peripheral wall 2d of the housing 2 with the guide members 11 being attached to the three positions of the outer periphery of the stator 32, the corner portion of the stator 32 does not come into contact with the inner peripheral wall 2d of the housing 2 and formation of chips causing failures can be prevented. Moreover, since fixation by press-fitting is possible, a complex shrink-fitting step can be eliminated.
- the guide members 11 have the raft shape in which the multiple guide pieces are connected to each other by the connection pieces 13 in the embodiment, the guide members 11 are not limited to this configuration.
- the guide pieces 12 alone may be used as the guide members 11, and the guide members 11 may have a curved plate shape curved along the outer periphery of the stator 32.
- Fig. 8 shows a modified example in which raft-shaped guide members 11 shown in Fig. 4 are attached to six positions of the outer peripheral surface of the stator 32.
- the six guide members 11 are attached to the outer periphery of the stator 32 at equal intervals.
- the stator 32 can be press-fitted with the inclination of the stator 32 with respect to the housing 2 being more surely prevented.
- Figs. 9 and 10 each show a modified example of the guide member 11 in the first embodiment.
- the guiding curved surface portion 15 is folded back in an arch shape, and the displacement preventing portion 18 is formed integrally with this folded-back end portion.
- the displacement preventing portion 18 extends in a flat surface shape from the folded back end portion of the guiding curved surface portion 15 toward the center of the stator 32. Since the displacement preventing portion 18 having such a flat surface shape has a large contact area with the insertion-side end portion of the stator 32, displacement of the guide member 11 in the axial direction in the press-fitting can be more surely prevented.
- the guide member 11 of Fig. 9 no locking-holding portion 16 is formed in the end portion of the interference portion 14 on the opposite side to the guiding curved surface portion 15. Even in this case, the guide member 11 can surely guide the stator 32 when the stator 32 is press-fitted to the inner peripheral wall 2d of the housing 2.
- the displacement preventing portion 18 is provided continuously with an end portion of the guiding curved surface portion 15 in an inclined manner.
- a corner portion of the displacement preventing portion 18 comes into contact with the insertion-side end portion (lower end portion) of the stator 32 and prevents displacement of the guide member 11 in the axial direction in the press-fitting of the stator 32.
- application of press-fitting force allows the displacement preventing portion 18 to deform in such a way as to be pressed and expanded toward the center side of the stator 32. Displacement of the guide member 11 can be thereby surely prevented.
- a boss portion for increasing the strength of the guiding curved surface portion 15 is formed on the outer peripheral surface side of the guiding curved surface portion 15, and a portion protruding toward the inner peripheral surface side of the guiding curved surface portion 15 is formed.
- This protrusion serves as the displacement preventing portion 18a which engages with the lower end portion of the stator 32 and prevents the guide member 11 from being displaced from the stator 32.
- the guide members 11 may be formed to be provided over the entire periphery of the stator 32.
- an electric compressor 101 in the second embodiment includes a substantially-cylindrical housing 102, a compression unit 103 housed in the housing 102 and configured to compress coolant, an electric motor unit 104 housed in the housing 102 to be adjacent to the compression unit 103, and a drive circuit unit 105 configured to control drive of the electric motor unit 104.
- the housing 102 includes a front housing 102a, a middle housing 102b, and a rear housing 102c. As shown in Fig. 11 , the front housing 102a is connected to the middle housing 102b, and the middle housing 102b is connected to the rear housing 102c, thereby forming the substantially-cylindrical housing 102.
- the compression unit 103, the electric motor unit 104, and the drive circuit unit 105 are housed in the housing 102.
- the drive circuit unit 105 configured to control the drive of the compression unit 103 is housed in the front housing 102a.
- the electric motor unit 104 and the compression unit 103 are housed in the middle housing 102b and the rear housing 102c.
- Bulging portions 102f are formed in an inner peripheral wall 102d of the rear housing 102c to protrude from the inner peripheral wall 102d.
- the compression unit 103 includes a cylinder block 107 having a cylinder chamber 121 inside an inner periphery, a pair of side blocks 109 arranged respectively on both end portions of the cylinder block 107, and a rotor 111 rotatably arranged in the cylinder chamber 121.
- the cylinder block 107 is formed in an O-shape.
- the both end portions of the cylinder block 107 are held by and between a front side block 109a and a rear side block 109b which are the pair of side blocks 109, and this forms the cylinder chamber 121 inside the inner periphery of the cylinder block 107.
- a columnar rotor 111 is rotatably arranged in the cylinder chamber 121. Vanes 123 protrude from vane grooves 125 formed in the rotor 111, and the coolant is compressed by an inner wall of the cylinder chamber 121 and front ends of the vanes 123. Note that multiple vane grooves 125 are formed on an outer periphery of the rotor 111 at equal intervals in a circumferential direction.
- the plate-shaped vanes 123 are housed in the vane grooves 125 to be capable of advancing and retreating.
- the rotor 111 is press-fitted and fixed to a later-described drive shaft 117 of the electric motor unit 104 and can rotate with rotation of the drive shaft 117.
- the electric motor unit 104 includes a stator 113, a rotor 115, the drive shaft 117, and guide members 119.
- the stator 113 is press-fitted to the inner peripheral wall 102d of the rear housing 102c.
- the rotor 115 is rotatably arranged inside the inner periphery of the stator 113.
- the drive shaft 117 is press-fitted and fixed to the rotor 115.
- the guide member 119 guides the press-fitting of the stator 113 into the rear housing 102c.
- the stator 113 includes a stator core 127 made of laminated steel plates, an insulator 131 made of insulating material and arranged in the stator core 127, and coils 129 wound around the stator core 127 via the insulator 131.
- the rotor 115 is formed in a columnar shape.
- the rotor 115 is rotated by magnetic force generated by flow of electric current through the stator 113.
- the drive shaft 117 is press-fitted and fixed at the center of the rotor 115, and the rotor 115 transmits rotational drive force to the drive shaft 117.
- One end portion of the drive shaft 117 is rotatably supported by the middle housing 102b while the other end portion is supported by the pair of side blocks 109 of the compression unit 103.
- the rotor 111 is press-fitted and fixed to the drive shaft 117 near the other end portion of the drive shaft 117, and the rotational drive force transmitted from the electric motor unit 104 is transmitted to the rotor 111 via the drive shaft 117.
- three guide members 119 are arranged on an outer periphery of the stator 113 at equal intervals in the circumferential direction.
- the guide members 119 are formed of thin plate material. As shown in Fig. 14 , each of the guide members 119 includes multiple guide pieces 133 extending in a press-fitting direction and connection pieces 135 configured to connect the multiple guide pieces 133 to each other, and is formed in a raft shape. Since the guide member 119 is formed in a raft shape, the guide member 119 can be formed in a curved surface shape along the outer periphery of the stator 113 and be attached along the outer periphery of the stator 113.
- Each of the guide pieces 133 having the curved shape along the outer periphery of the stator 113 includes an interference portion 137, a guiding curved surface portion 139, and a locking-holding portion 141.
- the interference portion 137 comes into contact with a corresponding one of the bulging portions 102f formed on the inner peripheral wall 102d of the rear housing 102c.
- the guiding curved surface portion 139 is formed in an end portion (lower end portion) of the guide piece 133 on one end side and guides the press-fitting of the stator 113 into the housing 102.
- the locking-holding portion 141 is formed on an end portion (upper end portion) of the guide piece 133 on the other end side which is opposite to the guiding curved surface portion 139.
- the interference portion 137 is press-fitted to the inner peripheral wall 102d of the rear housing 102 when the stator 113 is press-fitted to the bulging portions 102f of the rear housing 102c.
- the stator 113 can be press-fitted to the bulging portions 102f of the rear housing 102c without the outer periphery of the stator 113 coming into contact with the inner peripheral wall 102d of the rear housing 102c.
- Slit portions 140 are formed adjacent to the interference portions 137. Providing the slit portions 140 can reduce resistance due to friction in the press-fitting of the stator 113 to the rear housing 102c and facilitates the press-fitting. In addition, it is possible to reduce the weight of the guide member 119 and achieve weight reduction.
- the guiding curved surface portion 139 includes a taper portion 142 configured to guide the press-fitting of the stator 113 into the rear housing 102c and a displacement preventing portion 143 coming into contact with and locked to the end portion (lower end portion) of the stator 113 on a side from which the stator 113 is press-fitted into the rear housing 102c.
- the taper portion 142 is formed continuously with the interference portion 137 and is inclined to extend linearly from the inner peripheral wall 102d of the housing 102 along the axial direction of the stator 113.
- the taper portion 142 acts as a guide when the stator 113 is press-fitted into the rear housing 102c.
- the adjacent guide pieces 133 are connected to each other together with one of the connection pieces 135 to be described later.
- the displacement preventing portion 143 formed continuously with the taper portion 142 is formed by being folded from an end of the taper portion 142 on the opposite side to the interference portion 137 to come into contact with the stator 113.
- the displacement preventing portion 143 prevents the guide member 119 from being displaced in the axial direction when the stator 113 is press-fitted to the inner peripheral wall 102d of the rear housing 102c, by coming into contact with a front end portion of the stator 113 in the press-fitting direction.
- a protrusion 143a protruding from the inner peripheral surface.
- the front end portion of the stator 113 in the press-fitting direction comes into contact with the protrusion 143a and displacement between the guide member 119 and the stator 113 is thereby prevented.
- a boss portion for securing the strength of the guiding curved surface portion 139 is formed on an outer peripheral surface side of the guiding curved surface portion 139.
- the locking-holding portion 141 is formed continuously with the interference portion 137 and is formed to extend toward the center of the stator 113 in an end portion of the interference portion 137 on the opposite side to the guiding curved surface portion 139.
- the locking-holding portion 141 is curved in a U-shape from the end portion of the interference portion 137.
- the locking-holding portion 141 thus has a spring characteristic and holds the stator 113 on a rear end side of the stator 113 in the press-fitting direction by spring force.
- each of the guide members 119 supports the front end side and the rear end side of the stator 113 in the press-fitting direction by using the locking-holding portions 141 and the displacement preventing portions 143 of the guiding curved surface portions 139.
- connection pieces 135 connecting the guide pieces 133 to each other connect the adjacent guide pieces 133 in a raft shape.
- the positions where the connection pieces 135 are provided can be set near the end portions of the guide pieces 133.
- connection piece 135 provided near the front ends of the guide pieces 133 in the press-fitting direction connects the guide pieces 133 to each other in the taper portions 142 of the guiding curved surface portions 139 and in the interference portions 137 with which the inner peripheral wall 102d of the housing 102 comes into contact.
- the connection piece 135 provided near the rear ends of the guide pieces 133 in the press-fitting direction connects the guide pieces 133 to each other in the interference portions 137.
- connection piece 135 on the front end side in the press-fitting direction is also inclined to extend linearly from the inner peripheral wall 102d of the housing 102 along the axial direction of the stator 113 like the taper portion 142.
- connection pieces 135 are connected to the guide pieces 133 as shown in Fig. 14 in the embodiment, two or more connection pieces 135 may be provided. Even in this case, at least one of the connection pieces 135 connects the guide pieces 133 to each other in the guiding curved surface portions 139.
- the drive circuit unit 105 is housed in the front housing 102a.
- the drive circuit unit 105 controls the number of revolutions of the electric motor unit 104 depending on a thermal load of the compression unit 103.
- the three guide members 119 are attached to the outer periphery of the stator 113 at equal intervals in the circumferential direction.
- the displacement preventing portions 143 and the protrusions 143a formed in the guiding curved surface portions 139 are brought into contact with the front end portion of the stator 113 in the press-fitting direction, and the locking-holding portions 141 are then attached to the rear end portion of the stator 113 in the press-fitting direction by using the spring characteristic of the locking-holding portions 141.
- the guiding curved surface portions 139 of the guide members 119 are press-fitted from an opening portion of the housing 102.
- the press-fitting is performed such that the guiding curved surface portions 139 of the guide members 119 first come into sliding contact with the bulging portions 102f formed on the inner peripheral wall 102d of the rear housing 102c.
- the taper portions 142 of the guiding curved surface portions 139 thus guide the press-fitting. Accordingly, the press-fitting of the stator 113 into the housing 102 can be facilitated.
- the guiding curved surface portions 139 are press-fitted to the bulging portions 102f formed on the inner peripheral wall 102d of the housing 102, it is possible to prevent the front end portion of the stator 113 in the press-fitting direction from coming into contact with the opening portion of the housing 102. Accordingly, formation of chips (burrs) from the inner peripheral wall 102d of the housing 102 can be prevented.
- the interference portions 137 are press-fitted to the bulging portions 102f.
- the press-fitting is completed as shown in Figs. 16 and 17 by further performing the press-fitting.
- the guide members 119 having the guiding curved surface portions 139 configured to guide the press-fitting of the stator 131 into the housing 102 are arranged on the outer peripheral surface of the stator 113. Accordingly, the stator 113 can be fixed to the housing 102 without using a shrink-fitting step.
- Each of the guide members 119 are formed of the multiple guide pieces 133 having the guiding curved surface portions 139 and of the connection pieces 135 connecting the guide pieces 133 to each other, and one of the connection pieces 135 is connecting the guide pieces 133 to each other in the guiding curved surface portions 139.
- This enables the stator 113 to be surely fitted into the housing 102 with the formation of burrs (chips) suppressed and can secure a sufficient amount of interference.
- one of the connection pieces 135 is connected to the guide pieces 133 in the guiding curved surface portions 139. Accordingly, each of the guiding curved surface portions 139 can have a large cross-sectional area, and the strength of the guide member 119 can be improved.
- Each of the guide members 119 has the curved surface shape along the outer periphery of the stator 113, and the slit-shaped cuts (slit portions 140) are formed in the axial direction of the guide member 119. Guiding in the press-fitting of the stator 113 into the housing 102 can be thereby surely performed.
- the guide members 119 are made of thin plate material. Accordingly, it is possible to prevent an increase in weight due to the attachment of the guide members 119 and also suppress an increase in cost.
- the guide members 119 are attached at equal intervals in the circumferential direction of the stator 113. Accordingly, it is possible to prevent the stator 113 from being press-fitted in a manner inclined with respect to the housing 102.
- a gap is formed between the housing 102 and sections of the stator 113 where no guide members 119 are attached. Since the sections where no guide members 119 are attached do not come into contact with the housing 102, it is possible to prevent formation of chips (burrs) due to contact of the stator 113 with the housing 102, in the sections where no guide members 119 are attached.
- Fig. 18 shows a modified example in which the raft-shaped guide members 119 shown in Fig. 14 are attached to six positions of the outer periphery of the stator 113.
- the six guide members 119 attached to the outer periphery of the stator 113 are attached at equal intervals in the circumferential direction also in this modified example.
- the press-fitting of the stator 113 can be performed in a state where the inclination of the stator 113 with respect to the housing 102 is more surely prevented than in the aforementioned case where the three guide members 119 are attached to the outer periphery of the stator 113.
- Figs. 19 and 20 each show a modified example of the guide member 119 of the second embodiment.
- the guiding curved surface portion 139 is folded in a U-shape. Furthermore, the flat-surface-shaped displacement preventing portion 143 extends in such a way that the inner peripheral surface side of the guiding curved surface portion 139 extends toward the center of the stator 113 along the front end portion of the stator 113 in the press-fitting direction to form.
- the guiding curved surface portions 139 formed in the guide pieces 133 are connected to each other near the end portions thereof by the connection piece 135 also in this guide member 119.
- the displacement preventing portion 143 having such a flat surface shape has a large contact area with the front end portion of the stator 113 in the press-fitting direction, it is possible to more surely prevent the displacement of the guide member 119 in the press-fitting direction in the press-fitting.
- the protrusion 143a is formed on the inner peripheral surface of the guide member 119, and the protrusion 143a is formed along an outer peripheral end of the front end of the stator 113 in the press-fitting direction.
- the boss portion is formed on the outer peripheral surface of the guide member 119 also in the guide member 119 shown in Fig. 20 .
- the guiding curved surface portions 139 formed in the guide pieces 133 are connected to each other near the end portions thereof by the connection piece 135 also in this guide member 119.
- the protrusion 143a is provided along the outer peripheral end of the stator 113, in addition to the displacement preventing portion 143, the protrusion 143a also comes into contact with the front end portion of the stator 113 in the press-fitting direction. Accordingly, it is possible to more surely prevent the displacement of the guide member 119 in the press-fitting direction in the press-fitting.
- a protrusion forming hole 144 is provided in each of the guiding curved surface portions 139. Note that description of configurations same as those in the second embodiment and the modified examples described above is omitted.
- the protrusion forming hole 144 is formed by shearing the thin plate material forming the guide member 119. A portion sheared to form the protrusion forming hole 144 is pressed by a not-illustrated tool or the like in such a way that the protrusion 143a is inclined in a direction coming close to the displacement preventing portion 143.
- Fig. 22A is a cross-sectional view of the guide member 119 shows a state before the guide member 119 is attached to the stator 113.
- Fig. 22B is a cross-sectional view of the guide member 119 showing a state where the attachment of the guide member 119 to the outer periphery of the stator 113 is completed.
- the stator 113 is brought into contact with the displacement preventing portion 143 formed in the guiding curved surface portion 139 when the guide member 119 is attached to the stator 113. Then, by further pressing the stator 113 in the press-fitting direction from the state where the displacement preventing portion 143 and the stator 113 are in contact with each other, the displacement preventing portion 143 is displaced in a direction moving away from the protrusion 143a from the state of the guide member 119 shown in Fig. 22A , and the guide member 119 is set to an attachment completed state shown in Fig. 22B . At this time, the front ends of the protrusion 143a and the displacement preventing portion 143 come into contact with the stator 113 and support the front end portion of the stator 113 in the press-fitting direction.
- the protrusion 143a is formed by providing the protrusion forming hole 144 in each of the interference portions 137 of the guide member 119 and inclining the portion sheared to form the protrusion forming hole 144 in the direction coming close to the displacement preventing portion 143. Accordingly, the protrusion 143a can be formed by simply punching the thin plate material and pressing the protrusion forming hole 144. The protrusion 143a can be thus easily formed.
- the protrusion 143a and the displacement preventing portion 143 are in contact with the stator 113 as in the modified examples described above. Accordingly, the displacement of the stator 113 in the press-fitting direction can be prevented.
- the guide members 119 are arranged at three positions of the outer periphery of the stator 113 at equal intervals, or at six positions at equal intervals as shown in Fig. 18 .
- the number of positions where the guide members 119 are arranged may be a number other than three and six.
- any number of guide members 119 may be provided as long as the stator 113 can be inserted without being inclined in the press-fitting of the stator 113 into the housing 102.
- a single guide member 119 having a C-shape covering the outer periphery of the stator 113 may be provided.
- a configuration may be such that the protrusion forming hole 144 is provided in each of the taper portions 142 and the protrusion 143a is inclined in a direction coming close to the displacement preventing portion 143.
- the present invention includes various embodiments which are not described herein as a matter of course. Accordingly, the technical scope of the present invention is determined only by the matters to define the invention in the scope of claims regarded as appropriate from the aforementioned description.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Description
- The present invention relates to an electric compressor in which a compression unit compresses coolant by being driven by an electric motor unit.
- A general electric compressor includes an electric motor unit and a compression unit in a cylindrical housing. In the electric compressor, the electric motor unit controls the compression unit and the compression unit is driven by the electric motor to operate to compress coolant. The housing is made of aluminum for sake of weight reduction. The electric motor unit includes a stator in which coils are wound around a stator core and a rotor which is arranged inside the stator and which is rotated by magnetic force generated by electric current flowing through the stator.
- The stator is fixed to the inner peripheral wall of the housing and is fixed to the cylindrical housing by shrink-fitting as described in Patent Literature 1. This is because the stator and the housing have different coefficients of linear expansion and accordingly need to have a large amount of interference therebetween in view of a temperature increase in usage of the electric compressor. Such shrink-fitting is performed as follows. The housing is heated in advance and the stator core is inserted and positioned inside the heated housing. Then, the heated housing is cooled to shrink and the stator is thereby fixed to the housing.
- Patent Literature 1: Japanese Unexamined Patent Application Publication No.
2009-228546 - Since the housing needs to be heated when the stator is to be fixed to the housing by shrink fitting as in Patent Literature 1, the number of steps and the cost increase. Moreover, in the shrink-fitting, the temperature of resin parts such as an insulating plate included in the stator and an O-ring included in a rotating body needs to be adjusted to be kept at or below a heat-resistant temperature, and work is cumbersome. Furthermore, securing a sufficient amount of interference is difficult.
- An object of the present invention is to provide an electric compressor and a method for assembling an electric compressor wherein a stator can be fixed to a housing without using a shrink-fitting step, the stator can be surely press-fitted into the housing with the formation of burrs (chips) being suppressed, and a sufficient amount of interference can be secured.
- An electric compressor in accordance with the invention includes: a cylindrical housing; an electric motor unit fixed inside the housing and including a stator and a rotor, the stator being fixed to the housing by a press-fitting of the stator to an inner peripheral wall of the housing and configured to generate a magnetic force upon energization of the stator, the rotor being rotatably arranged inside the stator and configured to be rotated by the magnetic force generated by the stator; a compression unit arranged in the housing and configured to be driven by a rotational drive force of the electric motor unit and compress a coolant; and a guide member attached to an outer periphery of the stator and made of a thin plate material having a guiding curved surface portion configured to guide the press-fitting of the stator to the inner peripheral wall of the housing.
- The guided curved surface portion may be a curved surface extending in a direction toward a center of the stator from an end portion of the stator from which the stator is inserted into the housing.
- According to the configuration described above, the guide member provided with the guiding curved surface portion is attached to the outer periphery of the stator, and the stator is press-fitted into the housing in this attachment state. A corner portion of the stator thus does not come into contact with the inner peripheral wall of the housing and formation of burrs (chips) which causes failures can be prevented. Moreover, since fixation by press-fitting is possible, a complex shrink-fitting step can be eliminated. Furthermore, since the guide member is made of thin plate material, it is possible to reduce an increase in weight due to attachment of the guide member and suppress an increase in cost.
- Furthermore, the guiding curved surface portion is a curved surface extending toward the center side of the stator. Hence, the stator can be surely guided in the press-fitting of the stator into the housing.
- The guide member may include a displacement preventing portion extending from the guiding curved surface portion and configured to prevent a displacement of the guide member in an axial direction of the guide member in the press-fitting of the stator to the inner peripheral wall of the housing.
- According to the configuration described above, the displacement preventing portion of the guide member is provided. Hence, the stator can be surely press-fitted without the guide member being displaced in the press-fitting of the stator into the housing.
- The guide member may include: an interference portion formed in a shape elongated in an axial direction of the stator and press-fitted to the inner peripheral wall of the housing, the interference portion being connected to the guiding curved surface portion at an insertion-side end portion of the interference portion from which the interference portion is inserted into the inner peripheral wall of the housing; and a locking-holding portion provided in an end portion of the interference portion on an opposite side to the insertion-side end portion and configured to hold the stator.
- According to the configuration described above, the guide member is formed of the interference portion, the guiding curved surface portion, and the locking-holding portion, and the interference portion secures a sufficient amount of interference in the press-fitting of the stator while the locking-holding portion secures the attachment state to the stator. Hence, it is possible to stably press-fit the stator into the housing and to also stably attach the guide member to the stator.
- A plurality of the guide members may be provided, and the guide members may be attached at equal intervals along a circumferential direction of the stator.
- According to the configuration described above, the guide members are attached at equal intervals in the circumferential direction of the stator. Hence, the stator can be prevented from being press-fitted in a manner inclined with respect to the housing.
- A section of the inner peripheral wall of the housing facing a non-attachment section of the outer periphery of the stator where no guide member is attached may be offset toward an outer peripheral side of the housing with a gap from the non-attachment section of the stator.
- According configuration described above, a gap is formed between the housing and the section of the stator where no guide member is attached. Hence, the section where no guide member is attached does not come into contact with the housing, and chips (burrs) of housing due to contact are not formed also in the section where no guide member is attached.
- The guide member may include: a plurality of guide pieces each having the guiding curved surface portion, and a connection piece connecting the guide pieces to each other in the guiding curved surface portions.
- According to the configuration described above, the guide member is formed of the plurality of guide pieces each having the guiding curved surface portion and of a connection piece connecting the guide pieces to each other, and the connecting piece connects the guide pieces in the guiding curved surface portions. Hence, it is possible to surely press-fit the stator into the housing with formation of burrs (chips) being suppressed and secure a sufficient amount of interference.
- The guide member may have a curved surface shape along a circumferential direction of the stator and include a slit formed in an axial direction of the guide member.
- According to the configuration described above, the guide member has the curved surface shape along the circumferential direction of the stator, and a slit-shaped cut is formed in the axial direction of the guide member. Hence, the stator can be surely guided when the stator is press-fitted into the housing.
- A method for assembling an electric compressor in accordance with some embodiments is a method for the electric compressor including: a cylindrical housing; an electric motor unit fixed inside the housing and including a stator and a rotor, the stator being fixed to the housing by a press-fitting of the stator to an inner peripheral wall of the housing and configured to generate a magnetic force upon energization of the stator, the rotor being rotatably arranged inside the stator and configured to be rotated by the magnetic force generated by the stator; and a compression unit arranged in the housing and configured to be driven by a rotational drive force of the electric motor unit and compress a coolant. The method includes: attaching guide members made of a thin plate material to at least three positions of an outer periphery of the stator; and guiding a press-fitting of the stator to the inner peripheral wall of the housing by using guiding curved surface portions of the guide members as attached.
- According to the configuration described above, the guide member is attached to the outer periphery of the stator and the guiding curved surface portion of the guide member guides the press-fitting of the stator into the housing. Hence, it is possible to smoothly press-fit the stator into the housing and eliminate a cumbersome shrink-fitting step.
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Fig. 1 is a partially cutaway perspective view showing an electric compressor in a first embodiment of the present invention. -
Fig. 2 is a cross-sectional view showing a state where a stator is press-fitted into a housing. -
Fig. 3 is a perspective view showing a stator. -
Fig. 4 is a perspective view showing a guide member. -
Fig. 5 is a cross-sectional view and a partially-enlarged cross-sectional view showing an initial state of the press-fitting of the stator into the housing. -
Fig. 6 is a cross-sectional view showing a state where the press-fitting of the stator into the housing is completed. -
Fig. 7 is an enlarged cross-sectional view showing the state where the stator is press-fitted into the housing. -
Fig. 8 shows a modified example of the first embodiment and is a cross-sectional view showing a state where the stator is press-fitted into the housing with six guide members being attached to an outer periphery of the stator. -
Fig. 9 is a cross-sectional view showing a modified example of the guide member in the first embodiment. -
Fig. 10 is a cross-sectional view showing another modified example of the guide member of the first embodiment. -
Fig. 11 is a partially cutaway perspective view showing an electric compressor in a second embodiment of the present invention. -
Fig. 12 is a cross-sectional view showing a state where a stator is press-fitted into the housing. -
Fig. 13 is a perspective view showing the stator. -
Fig. 14 is a perspective view showing a guide member. -
Fig. 15 is a cross-sectional view and a partially-enlarged cross-sectional view showing a state where the press-fitting of the stator into the housing is started. -
Fig. 16 is a cross-sectional view showing a state where the press-fitting of the stator into the housing is completed. -
Fig. 17 is an enlarged cross-sectional view showing the state where the press-fitting of the stator into the housing is completed. -
Fig. 18 shows a modified example of the second embodiment and is a cross-sectional view showing a state where the stator is press-fitted into the housing with six guide members being attached to an outer periphery of the stator. -
Fig. 19 is a cross-sectional view showing a modified example of the guide member in the second embodiment. -
Fig. 20 is a cross-sectional view showing another modified example of guide member in the second embodiment. -
Fig. 21 is a side view of the guide member which shows another modified example of the second embodiment. -
Fig. 22A shows the other modified example of the second embodiment and is a cross-sectional view taken along the A-A line ofFig. 21 and showing a state before attachment of the guide member to the stator. -
Fig. 22B shows the other modified example of the second embodiment and is a cross-sectional view taken along the A-A line ofFig. 21 and showing a state where attachment of the guide member to the stator is completed. - A first embodiment of the present invention is described below in detail by using
Figs. 1 to 10 . -
Figs. 1 to 7 are views for explaining an electric compressor 1 in a first embodiment of the present invention.Fig. 1 is a partially cutaway perspective view of the entire electric compressor 1. As shown inFig. 1 , the electric compressor 1 includes ahousing 2, anelectric motor unit 3, acompression unit 4, and adrive circuit unit 5. - The
housing 2 includes afront housing 2a, amiddle housing 2b, and arear housing 2c and is formed entirely of aluminum in a substantially-cylindrical shape. Thehousings housing 2 is thereby formed to be hollow as a whole. Theelectric motor unit 3, thecompression unit 4, and thedrive circuit unit 5 are housed inside thehousing 2. - The
drive circuit unit 5 controls the number of revolutions of theelectric motor unit 3 depending on change of a thermal load of thecompression unit 4 and is housed in thefront housing 2a. Theelectric motor unit 3 drives thecompression unit 4 and is housed in themiddle housing 2b and therear housing 2c. Thecompression unit 4 compresses coolant by being driven by rotational drive force of theelectric motor unit 3 and is housed in therear housing 2c. - The
compression unit 4 includes acylinder block 42, afront side block 43, arear side block 44, and arotor 45. Acylinder chamber 41 having an elliptical inner wall surface is formed in thecylinder block 42. Thefront side block 43 and therear side block 44 holds thecylinder block 42 in a sandwiched state. Therotor 45 is attached to arotary drive shaft 31 extending from theelectric motor unit 3 and is rotatably housed in a center portion of thecylinder chamber 41. Therotary drive shaft 31 extends in a left-right direction in thehousing 2 and is rotatable in thehousing 2 by being supported at both end portions by themiddle housing 2b and therear side block 44. -
Multiple vane grooves 47 are formed in an outer periphery of therotor 45 at equal intervals in a circumferential direction, and avane 46 is housed in each of thevane grooves 47 to be capable of advancing and retreating. Each of thevanes 46 advances and retreats from and to the correspondingvane groove 47 by receiving a centrifugal force and an oil back pressure supplied to a bottom portion of thevane groove 47 which are generated by the rotation of therotor 45. Advancing of thevanes 46 causes top portions of thevanes 46 to slide along the inner wall surface of thecylinder chamber 41. Thevanes 46 divide thecylinder chamber 41 into multiple compression chambers. The volume of each of the compression chambers increases and decreases with the rotation of therotor 45 and the advancing and retreating of thevanes 46. An intake stroke, a compression stroke, and a discharge stroke of the coolant are repeated by the increase and decrease of the volume. In the intake stroke, the coolant is sucked in from an intake port. In the discharge stroke, the coolant compressed in the compression stroke is discharged from a discharge port. - The
electric motor unit 3 includes astator 32 fixed to therear housing 2c (hereafter referred to as housing 2) by being press-fitted into thehousing 2 and arotor 33 rotatably arranged inside thestator 32. - As shown in
Figs. 1 to 3 , in thestator 32,multiple coils 35 are wound around astator core 34 having a cylindrical exterior. Thecoils 35 are wound around thestator core 34 via athin insulator 36 made of insulating material. Magnetic force is generated upon energization of thecoils 35 by supplying electricity from thedrive circuit unit 5 to thecoils 35. - A
rotor 33 is attached to therotary drive shaft 31. Multiple permanent magnets corresponding to thecoils 35 of thestator 32 are provided on an outer peripheral side of therotor 33, and therotor 33 rotates by receiving magnetic force from thestator 32. This rotation causes therotary drive shaft 31 to rotate and therotor 45 of thecompression unit 4 is rotated by the rotation of therotary drive shaft 31. - The
stator core 34 of thestator 32 is formed of laminated steel plates formed by laminating thin annular steel plates. Press-fitting thestator core 34 to an innerperipheral wall 2d of thehousing 2 made of aluminum fixes thestator 32 to thehousing 2.Guide members 11 are attached to thestator 32 for the press-fitting of thestator 32 to the innerperipheral wall 2d of thehousing 2. - As shown in
Figs. 2 and3 , theguide members 11 are attached to multiple positions (three positions in the embodiment) of the outer periphery of the stator 32 (stator core 34) at equal intervals in the circumferential direction. Theguide members 11 guide the press-fitting of thestator 32 into thehousing 2. - As shown in
Fig. 4 , each of theguide members 11 is formed of multiple (four)guide pieces 12 extending along a press-fitting direction (up-down direction inFig. 4 ) andconnection pieces 13 provided integrally with theguide pieces 12. Theconnection pieces 13 are provided at multiple positions (two positions) along a longitudinal direction of theguide pieces 12 and connect theadjacent guide pieces 12 to each other at multiple positions in the longitudinal direction. Theguide member 11 as a whole is formed to have a raft shape by connecting themultiple guide pieces 12 with theconnection pieces 13 as described above. Since such aguide member 11 can have an arc shape along an arc-shaped outer peripheral wall of thestator 32, attachment along an outer surface of thestator 32 is made possible. - The
guide members 11 are formed by pressing thin steel plates. This can reduce an increase in weight due to provision of theguide members 11 and also suppress an increase in cost. - As shown in
Figs. 4 to 7 , theguide pieces 12 of theguide members 11 are formed to have substantially the same length as the length, in the axial direction, of the stator 32 (stator core 34) made of laminated steel plates. Each of theguide pieces 12 is formed of aninterference portion 14 formed to have a shape elongated in the axial direction of thestator 32, a guidingcurved surface portion 15 extending from an insertion-side end portion (lower end portion located on the lower side inFigs. 4 to 7 ) of theinterference portion 14, and a locking-holdingportion 16 provided in an end portion (upper end portion located on the upper side inFigs. 4 to 7 ) of theinterference portion 14 on the opposite side to the guidingcurved surface portion 15. - The
interference portion 14 has a flat plate shape and is press-fitted to the innerperipheral wall 2d of thehousing 2 when thestator 32 is press-fitted into thehousing 2. Hence, thestator 32 can be press-fitted to the innerperipheral wall 2d of thehousing 2 without the outer peripheral wall of thestator 32 coming into contact with the innerperipheral wall 2d of thehousing 2. - The guiding
curved surface portion 15 is formed of a curved surface extending to curve from the lower end portion of theinterference portion 14 toward a center side of thestator 32. Ataper portion 17 is formed in the curved surface portion of the guidingcurved surface portion 15. Thetaper portion 17 is inclined to extend linearly from the innerperipheral wall 2d of thehousing 2 along the axial direction of thestator 32, and acts as a guide when thestator 32 is press-fitted into thehousing 2. Providing such a guidingcurved surface portion 15 prevents a corner portion of thestator 32 from coming into direct contact with the innerperipheral wall 2d of thehousing 2 when thestator 32 is press-fitted to the innerperipheral wall 2d of thehousing 2. Accordingly, no chips are formed from thehousing 2. Failure due to formation of chips can be thereby prevented. - An extended end portion of this guiding
curved surface portion 15 serves as adisplacement preventing portion 18 which comes into contact with and is locked to an insertion-side end portion (lower end portion) of thestator 32. Thedisplacement preventing portion 18 prevents theguide member 11 from being displaced in the axial direction in the press-fitting to the innerperipheral wall 2d of thehousing 2 by coming into contact with the insertion-side end portion of thestator 32. - The locking-holding
portion 16 is formed integrally with theinterference portion 14 in the end portion on the opposite side to the guidingcurved surface portion 15 to extend toward the center side of thestator 32. The locking-holdingportion 16 is curved in a U-shape from the end portion of theinterference portion 14. The locking-holdingportion 16 thus has a spring characteristic and is locked to an end portion (upper end portion) of thestator 32 on the opposite side to the insertion-side end portion by spring force. This can achieve a state where theguide member 11 is attached to thestator 32 with detachment of theguide member 11 from thestator 32 being prevented. - As shown in
Fig. 2 , sections of the innerperipheral wall 2d of thehousing 2 facing the outer peripheral portion (non-attachment section) of thestator 32 where noguide members 11 are attached are formed to be offset toward the outer peripheral side (outward) of thehousing 2. Forming offsetportions 2f which are offset outward in the innerperipheral wall 2d of thehousing 2 and which correspond to the sections where noguide members 11 are attached can form gaps between thestator 32 and the innerperipheral wall 2d of thehousing 2 in the offsetportions 2f. Accordingly, the sections of thestator 32 where noguide members 11 are attached do not come into contact with the innerperipheral wall 2d of thehousing 2, and no chips ofhousing 2 are formed in the sections where noguide members 11 are attached. -
Figs. 5 and6 show operations of press-fitting thestator 32 to the innerperipheral wall 2d of thehousing 2. - Before the press-fitting, the
guide members 11 are attached to the three positions of the outer periphery of thestator 32 at equal intervals. Attaching theguide members 11 to at least three positions allows thestator 32 to be press-fitted without being inclined. The attachment of each of theguide members 11 is performed by locking the locking-holdingportion 16 to the upper end portion of thestator 32. As shown inFig. 5 , in this attachment state, the guidingcurved surface portion 15 of theguide member 11 extends toward the center side in the insertion-side end portion of thestator 32 and thereby covers the insertion-side end portion. - The
stator 32 is press-fitted to the innerperipheral wall 2d of thehousing 2 with theguide members 11 attached as described above. In the press-fitting, since thetaper portions 17 formed in the guidingcurved surface portion 15 guide the press-fitting to the innerperipheral wall 2d of thehousing 2, the press-fitting can be performed smoothly. Moreover, since the guidingcurved surface portions 15 prevent the corner portion of thestator 32 from coming into direct contact with the innerperipheral wall 2d of thehousing 2, formation of chips from thehousing 2 can be prevented. In the press-fitting, since thedisplacement preventing portions 18 prevent displacement of theguide members 11 in the axial direction, theguide members 11 are not displaced from thestator 32. - Moreover, as shown in
Fig. 5 , a boss portion for increasing the strength of the guidingcurved surface portion 15 is formed on the outer peripheral surface side of the guidingcurved surface portion 15, and a portion protruding toward the inner peripheral surface side of the guidingcurved surface portion 15 is formed. This protrusion serves as adisplacement preventing portion 18a which engages with the lower end portion of thestator 32 and prevents theguide member 11 from being displaced from thestator 32. -
Fig. 7 shows a state where the press-fitting of thestator 32 is completed. Atapered step portion 2e is formed in the innerperipheral wall 2d of thehousing 2, and the guidingcurved surface portion 15 of eachguide member 11 comes into contact with thestep portion 2e. The press-fitting of thestator 32 is stopped by this contact, and thestator 32 is fixed to a predetermined position in the innerperipheral wall 2d of thehousing 2. In this fixation state, theelongated interference portion 14 of theguide member 11 is press-fitted to the innerperipheral wall 2d of thehousing 2, a sufficient amount of interference can be secured and thestator 32 can be stably fixed to thehousing 2. - In the embodiment described above, since the
stator 32 is press-fitted to the innerperipheral wall 2d of thehousing 2 with theguide members 11 being attached to the three positions of the outer periphery of thestator 32, the corner portion of thestator 32 does not come into contact with the innerperipheral wall 2d of thehousing 2 and formation of chips causing failures can be prevented. Moreover, since fixation by press-fitting is possible, a complex shrink-fitting step can be eliminated. - Note that, although the
guide members 11 have the raft shape in which the multiple guide pieces are connected to each other by theconnection pieces 13 in the embodiment, theguide members 11 are not limited to this configuration. For example, theguide pieces 12 alone may be used as theguide members 11, and theguide members 11 may have a curved plate shape curved along the outer periphery of thestator 32. -
Fig. 8 shows a modified example in which raft-shapedguide members 11 shown inFig. 4 are attached to six positions of the outer peripheral surface of thestator 32. The sixguide members 11 are attached to the outer periphery of thestator 32 at equal intervals. In this case, thestator 32 can be press-fitted with the inclination of thestator 32 with respect to thehousing 2 being more surely prevented. -
Figs. 9 and 10 each show a modified example of theguide member 11 in the first embodiment. - In the
guide member 11 ofFig. 9 , the guidingcurved surface portion 15 is folded back in an arch shape, and thedisplacement preventing portion 18 is formed integrally with this folded-back end portion. Thedisplacement preventing portion 18 extends in a flat surface shape from the folded back end portion of the guidingcurved surface portion 15 toward the center of thestator 32. Since thedisplacement preventing portion 18 having such a flat surface shape has a large contact area with the insertion-side end portion of thestator 32, displacement of theguide member 11 in the axial direction in the press-fitting can be more surely prevented. - In the
guide member 11 ofFig. 9 , no locking-holdingportion 16 is formed in the end portion of theinterference portion 14 on the opposite side to the guidingcurved surface portion 15. Even in this case, theguide member 11 can surely guide thestator 32 when thestator 32 is press-fitted to the innerperipheral wall 2d of thehousing 2. - In the
guide member 11 ofFig. 10 , thedisplacement preventing portion 18 is provided continuously with an end portion of the guidingcurved surface portion 15 in an inclined manner. A corner portion of thedisplacement preventing portion 18 comes into contact with the insertion-side end portion (lower end portion) of thestator 32 and prevents displacement of theguide member 11 in the axial direction in the press-fitting of thestator 32. Moreover, application of press-fitting force allows thedisplacement preventing portion 18 to deform in such a way as to be pressed and expanded toward the center side of thestator 32. Displacement of theguide member 11 can be thereby surely prevented. - Moreover, as shown in
Fig. 10 , a boss portion for increasing the strength of the guidingcurved surface portion 15 is formed on the outer peripheral surface side of the guidingcurved surface portion 15, and a portion protruding toward the inner peripheral surface side of the guidingcurved surface portion 15 is formed. This protrusion serves as thedisplacement preventing portion 18a which engages with the lower end portion of thestator 32 and prevents theguide member 11 from being displaced from thestator 32. - Note that no locking-holding
portion 16 is formed in the end portion of theinterference portion 14 on the opposite side to the guidingcurved surface portion 15 also in theguide member 11 ofFig. 10 . Even in this case, theguide member 11 can surely guide thestator 32 when thestator 32 is press-fitted to the innerperipheral wall 2d of thehousing 2. - Moreover, although the embodiment described above shows examples in which the
guide members 11 are provided on the outer periphery of thestator 32 at three portions and six portions, theguide members 11 may be formed to be provided over the entire periphery of thestator 32. - Next, a second embodiment of the present invention is described in detail by using
Figs. 11 to 22B . - As shown in
Fig. 11 , anelectric compressor 101 in the second embodiment includes a substantially-cylindrical housing 102, acompression unit 103 housed in thehousing 102 and configured to compress coolant, anelectric motor unit 104 housed in thehousing 102 to be adjacent to thecompression unit 103, and adrive circuit unit 105 configured to control drive of theelectric motor unit 104. - The
housing 102 includes afront housing 102a, amiddle housing 102b, and arear housing 102c. As shown inFig. 11 , thefront housing 102a is connected to themiddle housing 102b, and themiddle housing 102b is connected to therear housing 102c, thereby forming the substantially-cylindrical housing 102. Thecompression unit 103, theelectric motor unit 104, and thedrive circuit unit 105 are housed in thehousing 102. - The
drive circuit unit 105 configured to control the drive of thecompression unit 103 is housed in thefront housing 102a. Theelectric motor unit 104 and thecompression unit 103 are housed in themiddle housing 102b and therear housing 102c. Bulgingportions 102f are formed in an innerperipheral wall 102d of therear housing 102c to protrude from the innerperipheral wall 102d. - The
compression unit 103 includes a cylinder block 107 having acylinder chamber 121 inside an inner periphery, a pair of side blocks 109 arranged respectively on both end portions of the cylinder block 107, and arotor 111 rotatably arranged in thecylinder chamber 121. - The cylinder block 107 is formed in an O-shape. The both end portions of the cylinder block 107 are held by and between a
front side block 109a and arear side block 109b which are the pair of side blocks 109, and this forms thecylinder chamber 121 inside the inner periphery of the cylinder block 107. - A
columnar rotor 111 is rotatably arranged in thecylinder chamber 121.Vanes 123 protrude from vane grooves 125 formed in therotor 111, and the coolant is compressed by an inner wall of thecylinder chamber 121 and front ends of thevanes 123. Note that multiple vane grooves 125 are formed on an outer periphery of therotor 111 at equal intervals in a circumferential direction. The plate-shapedvanes 123 are housed in the vane grooves 125 to be capable of advancing and retreating. - The
rotor 111 is press-fitted and fixed to a later-describeddrive shaft 117 of theelectric motor unit 104 and can rotate with rotation of thedrive shaft 117. - The
electric motor unit 104 includes astator 113, arotor 115, thedrive shaft 117, and guidemembers 119. Thestator 113 is press-fitted to the innerperipheral wall 102d of therear housing 102c. Therotor 115 is rotatably arranged inside the inner periphery of thestator 113. Thedrive shaft 117 is press-fitted and fixed to therotor 115. Theguide member 119 guides the press-fitting of thestator 113 into therear housing 102c. - The
stator 113 includes astator core 127 made of laminated steel plates, aninsulator 131 made of insulating material and arranged in thestator core 127, and coils 129 wound around thestator core 127 via theinsulator 131. - The
rotor 115 is formed in a columnar shape. Therotor 115 is rotated by magnetic force generated by flow of electric current through thestator 113. Moreover, thedrive shaft 117 is press-fitted and fixed at the center of therotor 115, and therotor 115 transmits rotational drive force to thedrive shaft 117. - One end portion of the
drive shaft 117 is rotatably supported by themiddle housing 102b while the other end portion is supported by the pair of side blocks 109 of thecompression unit 103. Therotor 111 is press-fitted and fixed to thedrive shaft 117 near the other end portion of thedrive shaft 117, and the rotational drive force transmitted from theelectric motor unit 104 is transmitted to therotor 111 via thedrive shaft 117. - As shown in
Figs. 12 and13 , regarding theguide members 119, threeguide members 119 are arranged on an outer periphery of thestator 113 at equal intervals in the circumferential direction. - The
guide members 119 are formed of thin plate material. As shown inFig. 14 , each of theguide members 119 includesmultiple guide pieces 133 extending in a press-fitting direction andconnection pieces 135 configured to connect themultiple guide pieces 133 to each other, and is formed in a raft shape. Since theguide member 119 is formed in a raft shape, theguide member 119 can be formed in a curved surface shape along the outer periphery of thestator 113 and be attached along the outer periphery of thestator 113. - Each of the
guide pieces 133 having the curved shape along the outer periphery of thestator 113 includes aninterference portion 137, a guidingcurved surface portion 139, and a locking-holdingportion 141. Theinterference portion 137 comes into contact with a corresponding one of the bulgingportions 102f formed on the innerperipheral wall 102d of therear housing 102c. The guidingcurved surface portion 139 is formed in an end portion (lower end portion) of theguide piece 133 on one end side and guides the press-fitting of thestator 113 into thehousing 102. The locking-holdingportion 141 is formed on an end portion (upper end portion) of theguide piece 133 on the other end side which is opposite to the guidingcurved surface portion 139. - The
interference portion 137 is press-fitted to the innerperipheral wall 102d of therear housing 102 when thestator 113 is press-fitted to the bulgingportions 102f of therear housing 102c. Specifically, thestator 113 can be press-fitted to the bulgingportions 102f of therear housing 102c without the outer periphery of thestator 113 coming into contact with the innerperipheral wall 102d of therear housing 102c. -
Slit portions 140 are formed adjacent to theinterference portions 137. Providing theslit portions 140 can reduce resistance due to friction in the press-fitting of thestator 113 to therear housing 102c and facilitates the press-fitting. In addition, it is possible to reduce the weight of theguide member 119 and achieve weight reduction. - The guiding
curved surface portion 139 includes ataper portion 142 configured to guide the press-fitting of thestator 113 into therear housing 102c and adisplacement preventing portion 143 coming into contact with and locked to the end portion (lower end portion) of thestator 113 on a side from which thestator 113 is press-fitted into therear housing 102c. - The
taper portion 142 is formed continuously with theinterference portion 137 and is inclined to extend linearly from the innerperipheral wall 102d of thehousing 102 along the axial direction of thestator 113. Thetaper portion 142 acts as a guide when thestator 113 is press-fitted into therear housing 102c. - In a portion of the
taper portion 142 on theinterference portion 137 side, theadjacent guide pieces 133 are connected to each other together with one of theconnection pieces 135 to be described later. - The
displacement preventing portion 143 formed continuously with thetaper portion 142 is formed by being folded from an end of thetaper portion 142 on the opposite side to theinterference portion 137 to come into contact with thestator 113. Thedisplacement preventing portion 143 prevents theguide member 119 from being displaced in the axial direction when thestator 113 is press-fitted to the innerperipheral wall 102d of therear housing 102c, by coming into contact with a front end portion of thestator 113 in the press-fitting direction. - On an inner peripheral surface side of the guiding
curved surface portion 139 where the guidingcurved surface portion 139 and thestator 113 come into contact with each other, there is formed aprotrusion 143a protruding from the inner peripheral surface. The front end portion of thestator 113 in the press-fitting direction comes into contact with theprotrusion 143a and displacement between theguide member 119 and thestator 113 is thereby prevented. A boss portion for securing the strength of the guidingcurved surface portion 139 is formed on an outer peripheral surface side of the guidingcurved surface portion 139. - The locking-holding
portion 141 is formed continuously with theinterference portion 137 and is formed to extend toward the center of thestator 113 in an end portion of theinterference portion 137 on the opposite side to the guidingcurved surface portion 139. The locking-holdingportion 141 is curved in a U-shape from the end portion of theinterference portion 137. The locking-holdingportion 141 thus has a spring characteristic and holds thestator 113 on a rear end side of thestator 113 in the press-fitting direction by spring force. - As described above, each of the
guide members 119 supports the front end side and the rear end side of thestator 113 in the press-fitting direction by using the locking-holdingportions 141 and thedisplacement preventing portions 143 of the guidingcurved surface portions 139. - The
connection pieces 135 connecting theguide pieces 133 to each other connect theadjacent guide pieces 133 in a raft shape. The positions where theconnection pieces 135 are provided can be set near the end portions of theguide pieces 133. - The
connection piece 135 provided near the front ends of theguide pieces 133 in the press-fitting direction connects theguide pieces 133 to each other in thetaper portions 142 of the guidingcurved surface portions 139 and in theinterference portions 137 with which the innerperipheral wall 102d of thehousing 102 comes into contact. Theconnection piece 135 provided near the rear ends of theguide pieces 133 in the press-fitting direction connects theguide pieces 133 to each other in theinterference portions 137. - An end portion of the
connection piece 135 on the front end side in the press-fitting direction is also inclined to extend linearly from the innerperipheral wall 102d of thehousing 102 along the axial direction of thestator 113 like thetaper portion 142. - Although the two
connection pieces 135 are connected to theguide pieces 133 as shown inFig. 14 in the embodiment, two ormore connection pieces 135 may be provided. Even in this case, at least one of theconnection pieces 135 connects theguide pieces 133 to each other in the guidingcurved surface portions 139. - The
drive circuit unit 105 is housed in thefront housing 102a. Thedrive circuit unit 105 controls the number of revolutions of theelectric motor unit 104 depending on a thermal load of thecompression unit 103. - Next, description is given of an operation of press-fitting the
stator 113 into thehousing 102. - First, as shown in
Figs. 12 and13 , the threeguide members 119 are attached to the outer periphery of thestator 113 at equal intervals in the circumferential direction. In the attachment of theguide members 119, thedisplacement preventing portions 143 and theprotrusions 143a formed in the guidingcurved surface portions 139 are brought into contact with the front end portion of thestator 113 in the press-fitting direction, and the locking-holdingportions 141 are then attached to the rear end portion of thestator 113 in the press-fitting direction by using the spring characteristic of the locking-holdingportions 141. - After the
guide members 119 are attached to thestator 113, as shown inFig. 15 , the guidingcurved surface portions 139 of theguide members 119 are press-fitted from an opening portion of thehousing 102. - When the
stator 113 is press-fitted into thehousing 102, the press-fitting is performed such that the guidingcurved surface portions 139 of theguide members 119 first come into sliding contact with the bulgingportions 102f formed on the innerperipheral wall 102d of therear housing 102c. Thetaper portions 142 of the guidingcurved surface portions 139 thus guide the press-fitting. Accordingly, the press-fitting of thestator 113 into thehousing 102 can be facilitated. - Moreover, since the guiding
curved surface portions 139 are press-fitted to the bulgingportions 102f formed on the innerperipheral wall 102d of thehousing 102, it is possible to prevent the front end portion of thestator 113 in the press-fitting direction from coming into contact with the opening portion of thehousing 102. Accordingly, formation of chips (burrs) from the innerperipheral wall 102d of thehousing 102 can be prevented. - As described above, by press-fitting the guiding
curved surface portions 139 in the press-fitting direction to the bulgingportions 102f formed on the innerperipheral wall 102d of thehousing 102, theinterference portions 137 are press-fitted to the bulgingportions 102f. The press-fitting is completed as shown inFigs. 16 and17 by further performing the press-fitting. - In the
electric compressor 101 of the embodiment, theguide members 119 having the guidingcurved surface portions 139 configured to guide the press-fitting of thestator 131 into thehousing 102 are arranged on the outer peripheral surface of thestator 113. Accordingly, thestator 113 can be fixed to thehousing 102 without using a shrink-fitting step. - Each of the
guide members 119 are formed of themultiple guide pieces 133 having the guidingcurved surface portions 139 and of theconnection pieces 135 connecting theguide pieces 133 to each other, and one of theconnection pieces 135 is connecting theguide pieces 133 to each other in the guidingcurved surface portions 139. This enables thestator 113 to be surely fitted into thehousing 102 with the formation of burrs (chips) suppressed and can secure a sufficient amount of interference. Moreover, one of theconnection pieces 135 is connected to theguide pieces 133 in the guidingcurved surface portions 139. Accordingly, each of the guidingcurved surface portions 139 can have a large cross-sectional area, and the strength of theguide member 119 can be improved. - Each of the
guide members 119 has the curved surface shape along the outer periphery of thestator 113, and the slit-shaped cuts (slit portions 140) are formed in the axial direction of theguide member 119. Guiding in the press-fitting of thestator 113 into thehousing 102 can be thereby surely performed. - The
guide members 119 are made of thin plate material. Accordingly, it is possible to prevent an increase in weight due to the attachment of theguide members 119 and also suppress an increase in cost. - The
guide members 119 are attached at equal intervals in the circumferential direction of thestator 113. Accordingly, it is possible to prevent thestator 113 from being press-fitted in a manner inclined with respect to thehousing 102. - A gap is formed between the
housing 102 and sections of thestator 113 where noguide members 119 are attached. Since the sections where noguide members 119 are attached do not come into contact with thehousing 102, it is possible to prevent formation of chips (burrs) due to contact of thestator 113 with thehousing 102, in the sections where noguide members 119 are attached. - Next, modified examples of the second embodiment are described by using
Figs. 18 to 22B . -
Fig. 18 shows a modified example in which the raft-shapedguide members 119 shown inFig. 14 are attached to six positions of the outer periphery of thestator 113. - The six
guide members 119 attached to the outer periphery of thestator 113 are attached at equal intervals in the circumferential direction also in this modified example. - In this modified example, the press-fitting of the
stator 113 can be performed in a state where the inclination of thestator 113 with respect to thehousing 102 is more surely prevented than in the aforementioned case where the threeguide members 119 are attached to the outer periphery of thestator 113. -
Figs. 19 and 20 each show a modified example of theguide member 119 of the second embodiment. - In the
guide member 119 shown inFig. 19 , the guidingcurved surface portion 139 is folded in a U-shape. Furthermore, the flat-surface-shapeddisplacement preventing portion 143 extends in such a way that the inner peripheral surface side of the guidingcurved surface portion 139 extends toward the center of thestator 113 along the front end portion of thestator 113 in the press-fitting direction to form. - As in the second embodiment described above, the guiding
curved surface portions 139 formed in theguide pieces 133 are connected to each other near the end portions thereof by theconnection piece 135 also in thisguide member 119. - Since the
displacement preventing portion 143 having such a flat surface shape has a large contact area with the front end portion of thestator 113 in the press-fitting direction, it is possible to more surely prevent the displacement of theguide member 119 in the press-fitting direction in the press-fitting. - Moreover, in the
guide member 119 shown inFig. 20 , theprotrusion 143a is formed on the inner peripheral surface of theguide member 119, and theprotrusion 143a is formed along an outer peripheral end of the front end of thestator 113 in the press-fitting direction. Note that the boss portion is formed on the outer peripheral surface of theguide member 119 also in theguide member 119 shown inFig. 20 . - As in the second embodiment and the modified example described above, the guiding
curved surface portions 139 formed in theguide pieces 133 are connected to each other near the end portions thereof by theconnection piece 135 also in thisguide member 119. - Since the
protrusion 143a is provided along the outer peripheral end of thestator 113, in addition to thedisplacement preventing portion 143, theprotrusion 143a also comes into contact with the front end portion of thestator 113 in the press-fitting direction. Accordingly, it is possible to more surely prevent the displacement of theguide member 119 in the press-fitting direction in the press-fitting. - Moreover, in each of the
guide members 119 shown inFigs. 19 and 20 , no locking-holdingportion 141 is formed in the end portion on the opposite side to the guidingcurved surface portion 139. Even in this case, the guiding by theguide member 119 can be surely performed when thestator 113 is press-fitted to the innerperipheral wall 102d of thehousing 102. - In the
guide member 119 shown inFigs. 21 ,22A, and 22B , aprotrusion forming hole 144 is provided in each of the guidingcurved surface portions 139. Note that description of configurations same as those in the second embodiment and the modified examples described above is omitted. - The
protrusion forming hole 144 is formed by shearing the thin plate material forming theguide member 119. A portion sheared to form theprotrusion forming hole 144 is pressed by a not-illustrated tool or the like in such a way that theprotrusion 143a is inclined in a direction coming close to thedisplacement preventing portion 143. -
Fig. 22A is a cross-sectional view of theguide member 119 shows a state before theguide member 119 is attached to thestator 113.Fig. 22B is a cross-sectional view of theguide member 119 showing a state where the attachment of theguide member 119 to the outer periphery of thestator 113 is completed. - In this modified example, the
stator 113 is brought into contact with thedisplacement preventing portion 143 formed in the guidingcurved surface portion 139 when theguide member 119 is attached to thestator 113. Then, by further pressing thestator 113 in the press-fitting direction from the state where thedisplacement preventing portion 143 and thestator 113 are in contact with each other, thedisplacement preventing portion 143 is displaced in a direction moving away from theprotrusion 143a from the state of theguide member 119 shown inFig. 22A , and theguide member 119 is set to an attachment completed state shown inFig. 22B . At this time, the front ends of theprotrusion 143a and thedisplacement preventing portion 143 come into contact with thestator 113 and support the front end portion of thestator 113 in the press-fitting direction. - As described above, the
protrusion 143a is formed by providing theprotrusion forming hole 144 in each of theinterference portions 137 of theguide member 119 and inclining the portion sheared to form theprotrusion forming hole 144 in the direction coming close to thedisplacement preventing portion 143. Accordingly, theprotrusion 143a can be formed by simply punching the thin plate material and pressing theprotrusion forming hole 144. Theprotrusion 143a can be thus easily formed. - Moreover, the
protrusion 143a and thedisplacement preventing portion 143 are in contact with thestator 113 as in the modified examples described above. Accordingly, the displacement of thestator 113 in the press-fitting direction can be prevented. - In each of the embodiment and the modified examples, the
guide members 119 are arranged at three positions of the outer periphery of thestator 113 at equal intervals, or at six positions at equal intervals as shown inFig. 18 . However, the number of positions where theguide members 119 are arranged may be a number other than three and six. Specifically, any number ofguide members 119 may be provided as long as thestator 113 can be inserted without being inclined in the press-fitting of thestator 113 into thehousing 102. - Furthermore, a
single guide member 119 having a C-shape covering the outer periphery of thestator 113 may be provided. - Moreover, although the
protrusion forming hole 144 is provided in each of theinterference portions 137 in the modified example shown inFigs. 21 ,22A, and 22B , a configuration may be such that theprotrusion forming hole 144 is provided in each of thetaper portions 142 and theprotrusion 143a is inclined in a direction coming close to thedisplacement preventing portion 143. - As described above, the present invention includes various embodiments which are not described herein as a matter of course. Accordingly, the technical scope of the present invention is determined only by the matters to define the invention in the scope of claims regarded as appropriate from the aforementioned description.
- The entire contents of Japanese Patent Application No.
2012-157415 (filed July 13, 2012 2013-025180 (filed February 13, 2013
Claims (8)
- An electric compressor comprising:a cylindrical housing (2;102);an electric motor unit (3;104) fixed inside the housing (2;102) and including a stator (32;113) and a rotor (33;115), the stator (32;113) being fixed to the housing (2;102) by a press-fitting of the stator (32;113) to an inner peripheral wall (2d;102d) of the housing (2;102) and configured to generate a magnetic force upon energization of the stator (32;113), the rotor (33;115) being rotatably arranged inside the stator (32;113) and configured to be rotated by the magnetic force generated by the stator (32;113);a compression unit (4;103) arranged in the housing (2;102) and configured to be driven by a rotational drive force of the electric motor unit (3;104) and compress a coolant; anda guide member (11;119) attached to an outer periphery of the stator (32;113) and made of a thin plate material having a guiding curved surface portion (15;139) configured to guide the press-fitting of the stator (32;113) to the inner peripheral wall (2d;102d) of the housing (2;102),wherein the guiding curved surface portion (15;139) has a curved surface extending in a direction toward a center of the stator (32;113) from an end portion of the stator (32;113) from which the stator (32;113) is inserted into the housing (2;102).
- The electric compressor according to claim 1, wherein the guide member (11;119) includes a displacement preventing portion (18;143) extending from the guiding curved surface portion (15;139) and configured to prevent a displacement of the guide member (11;119) in an axial direction of the guide member (11;119) in the press-fitting of the stator (32;113) to the inner peripheral wall (2d;102d) of the housing (2;102).
- The electric compressor according to any one of claims 1 or 2, wherein the guide member (11;119) includes:an interference portion (14;137) formed in a shape elongated in an axial direction of the stator (32;113) and press-fitted to the inner peripheral wall (2d;102d) of the housing (2;102), the interference portion (14;137) being connected to the guiding curved surface portion (15;139) at an insertion-side end portion of the interference portion (14;137) from which the interference portion (14;137) is inserted into the inner peripheral wall (2d;102d) of the housing (2;102); anda locking-holding portion (16;141) provided in an end portion of the interference portion (14;137) on an opposite side to the insertion-side end portion and configured to hold the stator (32;113).
- The electric compressor according to any one of claims 1 to 3, wherein
a plurality of the guide members (11;119) are provided, and the guide members (11;119) are attached at equal intervals along a circumferential direction of the stator (32;113). - The electric compressor according to any one of claims 1 to 4, wherein a section of the inner peripheral wall (2d;102d) of the housing (2;102) facing a non-attachment section of the outer periphery of the stator (32;113) where no guide member (11;119) is attached is offset toward an outer peripheral side of the housing (2;102) with a gap from the non-attachment section of the stator (32;113).
- The electric compressor according to claim 1, wherein the guide member (11;119) includes:a plurality of guide pieces (12;133) each having the guiding curved surface portion (15;139), anda connection piece (13;135) connecting the guide pieces (12;133) to each other in the guiding curved surface portions (15;139).
- The electric compressor according to claim 6, wherein the guide member (11;119) has a curved surface shape along a circumferential direction of the stator (32;113) and includes a slit (140) formed in an axial direction of the guide member (11;119).
- A method for assembling an electric compressor (1;101), the electric compressor (1;101) including: a cylindrical housing (2;102); an electric motor unit (3;104) fixed inside the housing (2;102) and including a stator (32;113) and a rotor (33;115), the stator (32;113) being fixed to the housing (2;102) by a press-fitting of the stator (32;113) to an inner peripheral wall (2d;102d) of the housing (2;102) and configured to generate a magnetic force upon energization of the stator (32;113), the rotor (33;115) being rotatably arranged inside the stator (32;113) and configured to be rotated by the magnetic force generated by the stator (32;113); and a compression unit (4;103) arranged in the housing (2;102) and configured to be driven by a rotational drive force of the electric motor unit (3;104) and compress a coolant, the method comprising:attaching guide members (11;119) made of a thin plate material to at least three positions of an outer periphery of the stator (32;113); andguiding a press-fitting of the stator (32;113) to the inner peripheral wall (2d;102d) of the housing (2;102) by using guiding curved surface portions (15;139) of the guide members (11;119) as attached.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012157415A JP5912950B2 (en) | 2012-07-13 | 2012-07-13 | Electric compressor |
JP2013025180A JP2014152746A (en) | 2013-02-13 | 2013-02-13 | Motor compressor |
PCT/JP2013/064462 WO2014010320A1 (en) | 2012-07-13 | 2013-05-24 | Electric compressor and method for assembling electric compressor |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2873859A1 EP2873859A1 (en) | 2015-05-20 |
EP2873859A4 EP2873859A4 (en) | 2015-12-02 |
EP2873859B1 true EP2873859B1 (en) | 2016-11-30 |
Family
ID=49915794
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13816417.3A Not-in-force EP2873859B1 (en) | 2012-07-13 | 2013-05-24 | Electric compressor and method for assembling electric compressor |
Country Status (4)
Country | Link |
---|---|
US (1) | US20150152870A1 (en) |
EP (1) | EP2873859B1 (en) |
CN (1) | CN104395607B (en) |
WO (1) | WO2014010320A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106100232B (en) * | 2016-06-28 | 2018-04-13 | 东风汽车泵业有限公司 | A kind of electric water pump motor stator one package structual |
DE102022003483A1 (en) | 2021-10-12 | 2023-04-13 | Sew-Eurodrive Gmbh & Co Kg | Stator pack and method of manufacturing a stator pack |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2849695A (en) * | 1954-11-12 | 1958-08-26 | Edward J Schaefer | Core construction |
US4603273A (en) * | 1985-08-14 | 1986-07-29 | Westinghouse Electric Corp. | Dynamoelectric machine with extended cleat assembly |
JPH01264547A (en) * | 1988-04-13 | 1989-10-20 | Yaskawa Electric Mfg Co Ltd | Securing method for stator core to frame in rotary electric machine and core used therefor |
DE60206517T2 (en) * | 2002-12-20 | 2006-06-22 | Delphi Technologies, Inc., Troy | Vibration-isolating fuel pump unit |
JP2006027355A (en) * | 2004-07-13 | 2006-02-02 | Nsk Ltd | Electric power steering device |
JP2006115581A (en) * | 2004-10-13 | 2006-04-27 | Matsushita Electric Ind Co Ltd | Closed electric compressor |
KR100747496B1 (en) * | 2006-11-27 | 2007-08-08 | 삼성전자주식회사 | Rotary compressor and control method thereof and air conditioner using the same |
CN101205912A (en) * | 2006-12-20 | 2008-06-25 | 乐金电子(天津)电器有限公司 | Rotation balance device of enclosed scroll compressor |
JP4447619B2 (en) * | 2007-03-20 | 2010-04-07 | 株式会社日本自動車部品総合研究所 | Laminated iron core |
DE102007058072A1 (en) * | 2007-12-03 | 2009-06-04 | Robert Bosch Gmbh | Electric machine |
JP2009228546A (en) * | 2008-03-21 | 2009-10-08 | Calsonic Kansei Corp | Motor-driven compressor |
US8227947B2 (en) * | 2009-08-10 | 2012-07-24 | Stainless Motors, Inc. | Electric motor for use in hazardous environments |
DE102009046112A1 (en) * | 2009-10-28 | 2011-05-12 | Robert Bosch Gmbh | Device for conveying fuel |
JP2012013030A (en) * | 2010-07-02 | 2012-01-19 | Panasonic Corp | Electric compressor |
US9181949B2 (en) * | 2012-03-23 | 2015-11-10 | Bitzer Kuehlmaschinenbau Gmbh | Compressor with oil return passage formed between motor and shell |
-
2013
- 2013-05-24 EP EP13816417.3A patent/EP2873859B1/en not_active Not-in-force
- 2013-05-24 CN CN201380031968.4A patent/CN104395607B/en not_active Expired - Fee Related
- 2013-05-24 WO PCT/JP2013/064462 patent/WO2014010320A1/en active Application Filing
- 2013-05-24 US US14/410,868 patent/US20150152870A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO2014010320A1 (en) | 2014-01-16 |
EP2873859A1 (en) | 2015-05-20 |
EP2873859A4 (en) | 2015-12-02 |
CN104395607B (en) | 2016-10-12 |
US20150152870A1 (en) | 2015-06-04 |
CN104395607A (en) | 2015-03-04 |
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