CN113054771A

CN113054771A - Electric compressor

Info

Publication number: CN113054771A
Application number: CN202011547266.XA
Authority: CN
Inventors: 浜名祥三; 大坪正辉; 高山裕基; 安谷屋拓
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2019-12-26
Filing date: 2020-12-24
Publication date: 2021-06-29
Anticipated expiration: 2040-12-24
Also published as: JP7294124B2; KR102392493B1; JP2021106455A; KR20210083194A; CN113054771B

Abstract

The invention provides an electric compressor capable of fixing a driving shaft to a rotor properly. In the electric compressor, a rotor (5b) has a rotor body (51), 1 st and 2 nd plates (53, 54) and fastening pins (56). The rotor body is composed of a plurality of electromagnetic steel plates (510) laminated in the direction of the driving axis (O). The 1 st and 2 nd plates sandwich the rotor body in the direction of the driving axis (O). The fastening pin fastens and connects the rotor body (51) and the 1 st and 2 nd plates in the direction of the driving axis (O). Each of the electromagnetic steel sheets (510) is formed with a fixing hole (51a) and a through hole (51 b). The 1 st and 2 nd plates are formed with 1 st and 2 nd insertion holes (53a, 54a) and 1 st and 2 nd communication holes (53b, 54b), respectively. In addition, the 1 st and 2 nd plates are respectively provided with a 1 st notch (53g) for communicating the 1 st insertion hole (53a) with the 1 st communication hole (53b), and a 2 nd notch (54g) for communicating the 2 nd insertion hole (54a) with the 2 nd communication hole (54 b).

Description

Electric compressor

Technical Field

The present invention relates to an electric compressor.

Background

Patent document 1 discloses a conventional electric compressor. The electric compressor includes a housing, a drive shaft, a motor mechanism, and a compression mechanism. The driving shaft, the motor mechanism and the compression mechanism are all arranged in the shell. The drive shaft is rotatable about a drive axis within the housing. The motor mechanism rotates the drive shaft about the drive axis. The compression mechanism is driven by a drive shaft and compresses a refrigerant as a fluid.

More specifically, the motor mechanism has a stator and a rotor. The stator is fixed in the shell. A drive shaft is fixed to the rotor. The rotor is disposed in the stator and is rotatable around a drive axis together with the drive shaft. The rotor has a rotor main body, a plurality of permanent magnets, and a pair of plates. The rotor body is formed of a plurality of steel plates stacked in the drive shaft center direction. Each permanent magnet is arranged on the rotor main body. Each plate is formed to have a thickness greater than that of each steel plate. The plates sandwich the rotor body in the drive shaft center direction.

Further, each steel plate and each plate are formed with an insertion hole and a plurality of communication holes. A drive shaft is inserted into the insertion hole. The communication holes are located on the outer peripheral side of the insertion hole and arranged in the circumferential direction of the insertion hole.

In this electric compressor, the drive shaft is fixed to the rotor body and further to the rotor by fitting the drive shaft into the insertion holes formed in the steel plates. Although there is no specific description in this document, the rotor body and the plates are generally fastened and coupled by a fastening member.

In this electric compressor, the rotor, and thus the motor mechanism, rotates the drive shaft about the drive axis in the housing. Thereby, the compression mechanism operates to compress the refrigerant.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-90479

Disclosure of Invention

Problems to be solved by the invention

In the conventional electric compressor described above, the rotor body is sandwiched between the plates in the drive shaft center direction, and the rotor body, that is, the steel plates are pressed in the drive shaft center direction while being constrained in the drive shaft center direction by the plates. Here, the thickness of each steel plate is thinner than that of each plate. Thus, the insertion holes formed in the steel plates can be deformed so as to expand in the radial direction by the load when the steel plates are pressed in the drive shaft center direction. In particular, in the structure in which the plates and the rotor body are fastened and coupled by the fastening coupling, the periphery of the fastening coupling is locally strongly pressed, and therefore, the inner circumferential surface of the insertion hole can be locally projected inward in each steel plate. In this case, in the electric compressor, the portion of the inner peripheral surface of the insertion hole that protrudes inward interferes with the drive shaft, and the drive shaft cannot be fitted properly into the insertion hole formed in each steel plate, which causes a problem that the drive shaft cannot be fixed properly to the rotor.

The present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to provide an electric compressor capable of appropriately fixing a drive shaft to a rotor.

Means for solving the problems

The electric compressor of the present invention comprises:

a housing;

a drive shaft disposed within the housing and rotatable about a drive axis;

a motor mechanism disposed within the housing and rotating the drive shaft; and

a compression mechanism disposed in the housing and driven by the drive shaft to compress a fluid,

the electric compressor is characterized in that it is provided with,

the motor mechanism includes an annular stator fixed in the housing and a rotor disposed in the stator,

the rotor includes a rotor body formed of a plurality of steel plates stacked in the driving axial direction, a plurality of permanent magnets provided in the rotor body, a pair of plates formed to be thicker than the respective steel plates and sandwiching the rotor body in the driving axial direction, and a fastening member fastening the rotor body and the respective plates in the driving axial direction,

an insertion hole through which the drive shaft is inserted, a plurality of communication holes arranged in a circumferential direction of the insertion hole and located on an outer circumferential side of the insertion hole, and a fastening hole through which the fastening coupling is inserted and located between the communication holes adjacent in the circumferential direction of the insertion hole are formed in each of the steel plates and each of the plates,

the drive shaft is fitted into the insertion hole formed in each of the steel plates,

in each of the plates, a notch is formed that communicates the insertion hole and the communication hole formed in each of the plates and that faces the rotor main body.

In the electric compressor of the present invention, the rotor body is formed of a plurality of steel plates stacked in the drive shaft center direction, and the thickness of each steel plate is thinner than the thickness of each plate. In this electric compressor, the rotor body is sandwiched between a pair of plates in the drive shaft center direction, and the rotor body and the plates are fastened and coupled together by a fastening member in the drive shaft center direction. Here, in the motor-driven compressor, a notch is formed in each plate, the notch communicating the insertion hole and the communication hole formed in each plate and opposing the rotor main body.

In addition, at the portion where the notch is present in each plate, the binding force in the driving axial direction of the rotor main body is reduced. Thus, in the electric compressor, when the rotor body and the plates are fastened and coupled in the drive shaft center direction by the fastening and coupling member, the steel plates are easily deformed in the drive shaft center direction toward the notch side. As a result, in each steel plate, that is, in the rotor body, the inner peripheral surface of the insertion hole is less likely to partially protrude inward, and therefore, in this electric compressor, the drive shaft can be appropriately fitted into the insertion hole formed in each steel plate.

Therefore, according to the electric compressor of the present invention, the drive shaft can be appropriately fixed to the rotor.

In the present invention, the position of the notch provided in each plate is a position between the insertion hole and the communication hole which have been formed through the plate. Since this portion has lower rigidity than other portions in each plate, the provision of the notch has little influence on the rigidity of the entire plate. Therefore, in the electric compressor, the drive shaft can be appropriately fitted into the insertion holes formed in the respective steel plates so that the rigidity of the entire rotor is not substantially reduced.

The recess preferably extends through the plates in the direction of the drive axis. In this case, since the notch can be formed simultaneously when the through hole and the communication hole are formed in each plate, the plate can be easily processed. Therefore, the productivity of the electric compressor is improved, and the manufacturing cost can be reduced. Further, since the notch penetrates the plates in the drive shaft center direction, when the rotor body and the plates are fastened and coupled in the drive shaft center direction in the electric compressor, the steel plates are easily deformed in the drive shaft center direction toward the notch, and therefore, the insertion holes formed in the steel plates are not easily deformed further in the radial direction.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the electric compressor of the present invention, the drive shaft can be suitably fixed to the rotor.

Drawings

Fig. 1 is a schematic view showing an electric compressor of the embodiment.

Fig. 2 is a main portion enlarged sectional view showing an X portion of fig. 1, relating to the electric compressor of the embodiment.

Fig. 3 is a front view of the electric compressor according to the embodiment, as viewed from the front side of the rotor body and the permanent magnets.

Fig. 4 is a front view of the electric compressor according to the embodiment, as seen from the front side of the 1 st plate.

Fig. 5 is a rear view of the electric compressor according to the embodiment, as viewed from the rear side of the 2 nd plate.

Fig. 6 is a front view of the electric compressor according to the embodiment, as viewed from the front side of the rotor.

Fig. 7 is a front view of the electric compressor according to the embodiment, viewed from the front side, showing a state in which the drive shaft is fixed to the rotor.

Fig. 8 is a front view of the electric compressor according to the comparative example, as viewed from the front side of the rotor.

Fig. 9 is a front view of the electric compressor according to the comparative example, showing deformation of the specific region caused by heating, the rotor body and the permanent magnet being viewed from the front side.

Description of the reference numerals

1 … casing

3 … drive shaft

5 … motor mechanism

5a … stator

5b … rotor

7 … compression mechanism

51 … rotor body

51a … fixed hole (inserting hole)

51b … through hole (communication hole)

52 … magnetic core (permanent magnet)

53 … board 1

53a … the 1 st insertion hole (insertion hole)

53b … communication hole 1 (communication hole)

53g … notch 1 (notch)

54 … second plate (plate)

54a … 2 nd through-hole (through-hole)

54b … second communication hole (communication hole)

54g … notch 2 (notch)

56 fastening pin 56 … (fastening connector)

510 … electromagnetic steel plate (Steel plate)

535. 536 … No. 2 Pin hole (fastening connection hole)

545. 546 … No. 3 pinhole (fastening connection hole)

555. 556 … 1 st pinhole (fastening connection hole)

O … drive axle center

Detailed Description

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. The electric compressor of the embodiment is specifically a scroll-type electric compressor. The electric compressor is mounted on a vehicle, not shown, and constitutes a refrigeration circuit of the vehicle.

As shown in fig. 1, the electric compressor of the embodiment includes a housing 1, a drive shaft 3, a motor mechanism 5, and a compression mechanism 7. The housing 1 includes a housing main body 11, a 1 st cover 13, and a 2 nd cover 15.

In the present embodiment, the front-rear direction and the up-down direction of the electric compressor are defined by solid arrows shown in fig. 1. In addition, in fig. 2 and later, the front-back direction and the vertical direction of the electric compressor are defined in correspondence with fig. 1. The above directions are examples for convenience of explanation, and the electric compressor may be appropriately changed in posture according to a vehicle or the like on which the electric compressor is mounted.

As shown in fig. 2, the housing main body 11 has a front wall 11a and a peripheral wall 11 b. The front wall 11a is located at the front end of the housing main body 11, and extends in the radial direction of the housing main body 11. The peripheral wall 11b is connected to the front wall 11a and extends rearward from the front wall 11a in the direction of the drive axis O of the drive shaft 3. The housing body 11 is formed into a substantially cylindrical shape extending in the direction of the drive axis O by the front wall 11a and the peripheral wall 11 b. Here, the driving axis O direction is parallel to the front-rear direction of the electric compressor. Thus, the casing body 11 has a bottomed tubular shape extending in the driving axis O direction, i.e., the front-rear direction of the electric compressor.

The casing body 11 is formed with a suction port 11c and a plurality of bolt holes 11 d. A motor chamber 111 is formed inside the housing main body 11.

The suction port 11c extends in the radial direction of the housing body 11, and communicates the outside of the housing body 11 with the motor chamber 111. The suction port 11c is connected to an evaporator (not shown) by a pipe (not shown). Thereby, the low-temperature and low-pressure refrigerant gas having passed through the evaporator is sucked into the motor chamber 111. The refrigerant gas is an example of the "fluid" in the present invention. That is, the motor chamber 111 also functions as a suction chamber. As shown in fig. 1, each bolt hole 11d extends in the driving axis O direction and opens at the rear end of the housing body 11.

In fig. 1, one of the plurality of bolt holes 11d is illustrated.

The 1 st cover 13 is positioned on the front side of the housing main body 11 in the drive axis O direction. The 1 st cover 13 is fixed to the front wall 11a of the housing main body 11 by a plurality of bolts not shown. The 1 st cover 13 is formed in a bottomed tubular shape, and houses an inverter circuit (not shown) therein.

The 2 nd cover 15 is located on the rear side of the housing main body 11 in the drive axis O direction. The 2 nd cover 15 is fixed to the rear end of the case main body 11 by a plurality of bolts 15 a. Further, in fig. 1, one of a plurality of bolts 15a is illustrated. The 2 nd cover 15 is formed in a bottomed cylindrical shape and has a discharge chamber (not shown) formed therein. The discharge chamber is connected to a condenser (not shown) by a pipe (not shown).

As shown in fig. 1 and 2, the drive shaft 3 is provided inside the casing main body 11 including the motor chamber 111. As shown in fig. 2, the drive shaft 3 has a cylindrical shape extending in the direction of the drive axis O, and includes a small diameter portion 3a, a large diameter portion 3b, and a tapered portion 3 c. The small diameter portion 3a is located on the front end side of the drive shaft 3. The large diameter portion 3b is located rearward of the small diameter portion 3 a. The large diameter portion 3b is formed to have a diameter larger than that of the small diameter portion 3 a. The tapered portion 3c is located between the small diameter portion 3a and the large diameter portion 3 b. The tapered portion 3c is connected to the small diameter portion 3a at the tip end. The tapered portion 3c expands in diameter as it goes rearward and is connected to the large diameter portion 3b at the rear end.

The small diameter portion 3a of the drive shaft 3 is rotatably supported by the front wall 11a of the housing main body 11 via a radial bearing 19. Thereby, the drive shaft 3 can rotate around the drive axis O in the motor chamber 111.

The motor mechanism 5 is disposed in the motor chamber 111. The motor mechanism 5 includes an annular stator 5a and a rotor 5 b. The stator 5a is fixed to the inner peripheral surface of the peripheral wall 11b in the motor chamber 111. The stator 5a is connected to the inverter circuit.

The stator 5a has a stator core 501 and a coil end 503. The stator core 501 is formed in a cylindrical shape. A coil 505 is wound around the stator core 501. The coil end 503 is annular and protrudes forward and backward in the direction of the drive axis O from the stator core 501.

The rotor 5b is disposed in the stator 5 a. The rotor 5b includes a rotor body 51, a plurality of magnetic cores 52, a 1 st plate 53, a 2 nd plate 54, a rotor weight 55, and a plurality of fastening pins 56 (fastening members). Each core 52 is an example of a "permanent magnet" in the present invention. The 1 st plate 53 and the 2 nd plate 54 are examples of the "plate" in the present invention.

The rotor body 51 is formed of a plurality of electromagnetic steel plates 510 having the same shape. Each electromagnetic steel sheet 510 is an example of a "steel sheet" in the present invention. As shown in fig. 3, each electromagnetic steel sheet 510 is formed in a disk shape. A fixing hole 51a is formed in the center of each electromagnetic steel plate 510, that is, in the center of the rotor body 51. Further, each of the magnetic steel sheets 510 has 5 through holes 51b formed on the outer peripheral side of the fixing hole 51 a. Further, in each of the magnetic steel sheets 510, 1 st pin holes 555 to 558 and 10 housing holes 51c are formed on the outer peripheral side of the magnetic steel sheet 510 with respect to each through hole 51 b. The fixing hole 51a, the through holes 51b, the 1 st pin holes 555 to 558, and the housing holes 51c penetrate the electromagnetic steel sheet 510 in the direction of the driving axis O. The fixing holes 51a, the through holes 51b, the 1 st pin holes 555 to 558, and the receiving holes 51c are separated from each other and do not communicate with each other.

The fixing hole 51a is formed as a circular hole matching the large diameter portion 3b of the drive shaft 3. More precisely, the fixing hole 51a is formed as a circular hole having a diameter slightly smaller than that of the large diameter portion 3 b. The through holes 51b are formed in a substantially fan shape and arranged at equal intervals in the circumferential direction of the fixing hole 51 a. The 1 st pin holes 555 to 558 are formed as circular holes, and are arranged on the outer peripheral side of the electromagnetic steel sheet 510 with respect to the through holes 51b in the circumferential direction of the fixing hole 51 a. Here, of the 1 st pin holes 555 to 558, the 1 st pin hole 555 and the 1 st pin hole 556 are disposed between the through holes 51b adjacent to each other in the circumferential direction of the fixed hole 51a on the outer circumferential side of the electromagnetic steel sheet 510 with respect to the through holes 51 b. On the other hand, although the 1 st pin hole 557 and the 1 st pin hole 558 are located on the outer peripheral side of the magnetic steel sheet 510 with respect to the through holes 51b, they are not disposed between the through holes 51b adjacent to each other in the circumferential direction of the fixed hole 51 a. Thus, the fixing hole 51a, the through holes 51b, and the 1 st pin holes 555 and 556 are examples of the "insertion hole", "through hole", and "fastening hole" in the present invention. More specifically, the fixing hole 51a, the through holes 51b, and the 1 st pin holes 555 and 556 are examples of "insertion holes formed in the steel plates", "through holes formed in the steel plates", and "fastening holes formed in the steel plates". Each of the housing holes 51c is formed in a rectangular shape, and is arranged on the outer peripheral side of the electromagnetic steel sheet 510 with respect to each of the through holes 51b in the circumferential direction of the fixing hole 51 a. The shapes and the number of the through holes 51b, the 1 st pin holes 555 to 558, and the receiving holes 51c can be appropriately designed. Further, the 1 st pin hole 557 and the 1 st pin hole 558 may be disposed between the through holes 51b on the outer peripheral side of the electromagnetic steel sheet 510 with respect to the through holes 51 b.

As shown in fig. 2, the magnetic steel sheets 510 are stacked on each other in the direction of the driving axis O. At this time, the electromagnetic steel sheets 510 are aligned with the fixing holes 51a in the driving axis O direction, and the through holes 51b, the 1 st pin holes 555 to 558, and the housing holes 51c are aligned with each other in the driving axis O direction. Thus, the rotor body 51 is formed. That is, in the rotor body 51, the fixing hole 51a, the through holes 51b, the 1 st pin holes 555 to 558, and the housing holes 51c penetrate in the driving axis O direction. Thus, the rotor body 51 is formed into a substantially cylindrical body extending in the direction of the drive shaft center O. In fig. 2, for ease of explanation, the number of the magnetic steel sheets 510 is simplified in addition to the thickness of the magnetic steel sheets 510.

By forming the fixing holes 51a and the through holes 51b, as shown in fig. 3, in each of the magnetic steel sheets 510, that is, in the rotor body 51, a region between the fixing hole 51a and each of the through holes 51b is defined as a specific region 511. On the other hand, in the rotor body 51, a portion on the outer peripheral side of each through hole 51b is defined as an outer peripheral region 512. That is, the 1 st pin holes 555 to 558 and the receiving holes 51c are disposed in the outer peripheral region 512. In the rotor body 51, the connection portions 513 are formed at the positions between the through holes 51 b. Each connection portion 513 is connected to the specific region 511 and the outer peripheral region 512. That is, in the rotor main body 51, the specific region 511 and the outer peripheral region 512 are formed into a substantially cylindrical body by the through holes 51b and the connecting portions 513 existing therebetween. Here, the thickness of the specific region 511 in the radial direction of the rotor main body 51 is thinner than the thickness of the outer peripheral region 512 in the radial direction of the rotor main body 51.

As shown in fig. 2 and 3, each core 52 is formed in a rectangular column shape extending in the direction of the drive axis O. The length of each core 52 in the direction of the drive axis O is formed to be substantially the same as the length of the rotor body 51 in the direction of the drive axis O. The cores 52 are accommodated in the accommodating holes 51c, respectively. Thus, as shown in fig. 3, each core 52 is arranged in the circumferential direction of the fixing hole 51a in the outer peripheral region 512 of the rotor body 51.

As shown in fig. 2, the 1 st plate 53 is positioned on the front side in the driving axis O direction with respect to the rotor body 51. The 1 st plate 53 is formed of a metal plate material having a disk shape. More specifically, the 1 st plate 53 is formed of a plate material having a thickness greater than the thickness of each of the electromagnetic steel plates 510 in the driving axis O direction. That is, the thickness of the 1 st plate 53 is thicker than the thickness of each electromagnetic steel sheet 510. As shown in fig. 6 and 7, the 1 st plate 53 has a disk shape with a diameter smaller than the diameter of each of the magnetic steel plates 510, that is, the rotor body 51.

As shown in fig. 4, a 1 st insertion hole 53a is formed in the center of the 1 st plate 53. In addition, in the 1

st plate

53, 51 st communication holes 53b are formed on the outer peripheral side of the 1 st insertion hole 53 a. In addition, in the 1

st plate

53, 2 nd pin holes 535 to 538 are formed on the outer peripheral side of each 1 st communication hole 53 b. The 1 st insertion hole 53a, the 1 st communication hole 53b, and the 2 nd pin holes 535 to 538 penetrate the 1 st plate 53 in the driving axis O direction. The 1 st communication hole 53b and the 2 nd pin holes 535 to 538 are separated from each other and are not communicated with each other.

The 1 st insertion hole 53a is formed as a circular hole. More precisely, as shown in fig. 2 and 7, the 1 st insertion hole 53a is formed in a circular shape having a diameter larger than the diameter of the fixing hole 51a of the rotor body 51 and the diameter of the large diameter portion 3b of the drive shaft 3. The 1 st communication hole 53b is formed in a substantially fan shape corresponding to each through hole 51b of the rotor body 51, and is arranged at equal intervals in the circumferential direction of the 1 st insertion hole 53 a. The 2 nd pin holes 535 to 538 are formed as circular holes matching the 1 st pin holes 555 to 558 of the rotor body 51, and are arranged in the circumferential direction of the 1 st insertion hole 53 a. Here, among the 2 nd pin holes 535 to 538, the 2 nd pin hole 535 and the 2 nd pin hole 536 are disposed on the outer peripheral side of the 1 st communication hole 53b and between the 1 st communication holes 53b adjacent to each other in the circumferential direction of the 1 st insertion hole 53 a. On the other hand, the 2 nd pin hole 537 and the 2 nd pin hole 538 are located on the outer peripheral side of the 1 st communication holes 53b, but are not disposed between the 1 st communication holes 53b adjacent to each other in the circumferential direction of the 1 st insertion hole 53 a. Thus, the 1 st insertion hole 53a, the 1 st communication hole 53b, and the 2 nd pin holes 535 and 536 are examples of the "insertion hole", "through hole", and "fastening hole" in the present invention. More specifically, the 1 st insertion hole 53a, the 1 st communication hole 53b, and the 2 nd pin holes 535 and 536 are examples of "insertion holes formed in the plates", "through holes formed in the plates", and "fastening holes formed in the plates". The 2 nd pin hole 537 and the 2 nd pin hole 538 may be disposed between the 1 st communication holes 53b on the outer peripheral side of the 1 st communication holes 53 b.

Further, as shown in fig. 4, the 1 st restricting portion 53d, the 1 st outer peripheral portion 53e, and the 51 st bridge portions 53f are formed in the 1 st plate 53 by the 1 st insertion hole 53a and the 1 st communication holes 53 b. The 1 st constraining portion 53d is located between the 1 st insertion hole 53a and each 1 st communication hole 53 b. The 1 st outer peripheral portion 53e is located on the outer peripheral side of each 1 st communication hole 53 b. The 1 st bridge portions 53f are respectively positioned between the 1 st communication holes 53 b. Each 1 st bridge portion 53f is connected to the 1 st constraining portion 53d and the 1 st outer peripheral portion 53 e.

In addition, 51 st notches 53g are formed in the 1 st plate 53. Each 1 st notch 53g is an example of a "notch" in the present invention. The 1 st notches 53g are respectively located between the 1 st insertion hole 53a and the 1 st communication holes 53 b. The 1 st notches 53g extend in the radial direction of the 1 st plate 53, and are connected to the 1 st insertion hole 53a and the 1 st communication holes 53 b. In addition, each 1 st notch 53g penetrates the 1 st plate 53 in the driving axis O direction. Thus, in the 1 st plate 53, the 1 st constraining portions 53d are notched in the radial direction of the 1 st plate 53 by the 1 st notches 53 g. That is, the 1 st constraining section 53d is divided into 5 by each 1 st notch 53 g.

As shown in fig. 2, the 2 nd plate 54 is located on the rear side in the drive axis O direction with respect to the rotor body 51. Similarly to the 1 st plate 53, the 2 nd plate 54 is also formed of a plate material thicker than the magnetic steel plates 510 in the driving axis O direction. The 2 nd plate 54 also has a disk shape having a diameter smaller than the diameter of each of the magnetic steel plates 510, that is, the rotor body 51.

As shown in fig. 5, the 2 nd plate 54 is formed with 2

nd insertion holes

54a, 5

nd communication holes

54b, and 3 rd pin holes 545 to 548. Of the 3 rd pin holes 545 to 548, the 3 rd pin hole 545 and the 3 rd pin hole 546 are disposed between the 2 nd communication holes 54b adjacent to each other in the circumferential direction of the 2 nd communication holes 54a on the outer circumferential side of the 2 nd communication holes 54 b. On the other hand, the 3 rd pin hole 547 and the 3 rd pin hole 548 are located on the outer peripheral side of each 2 nd communication hole 54b, but are not disposed between the adjacent 2 nd communication holes 54b in the circumferential direction of the 2 nd insertion hole 54 a. In addition, the 2 nd plate 54 is formed with a 2 nd constraining portion 54d, a 2 nd outer

peripheral portion

54e, and 52 nd bridge portions 54 f. In the 2

nd plate

54, 2 nd notches 54g are formed between the 2 nd insertion hole 54a and the 2 nd communication holes 54b, respectively. The 2 nd insertion hole 54a, the 2 nd communication holes 54b, and the 3 rd pin holes 545 and 546 are examples of the "insertion hole formed in each plate", the "through hole formed in each plate", and the "fastening hole formed in each plate" in the present invention. Each 2 nd notch 54g is also an example of the "notch" in the present invention. Note that the structure of the 2 nd plate 54 including the structure of the 2 nd insertion hole 54a and the like is the same as that of the 1 st plate 53, and therefore, detailed description thereof is omitted. That is, in the 2 nd plate 54, the 2 nd constraining portions 54d are also notched in the radial direction of the 2 nd plate 54 by the 2 nd notches 54 g. Therefore, the 2 nd constraining section 54d is also divided into 5 by each 2 nd notch 54 g. The 3 rd pin hole 547 and the 3 rd pin hole 548 may be disposed between the 2 nd communication holes 54b on the outer peripheral side of the 2 nd communication holes 54b, respectively.

As shown in fig. 4, rotor weight 55 is formed of a metal plate having a substantially circular arc shape. As shown in fig. 2, the rotor weight 55 is set to have a plate thickness larger than the plate thicknesses of the 1 st and 2

nd plates

53 and 54. As shown in fig. 4, the rotor weight 55 is formed with 4 th pin holes 55a and 55 b. The 4 th pin holes 55a and 55b are formed as circular holes matching the 2 nd pin holes 537 and 538 of the 1 st plate 53, respectively, and penetrate the rotor weight 55 in the driving axis O direction. The shape and plate thickness of the rotor weight 55 can be appropriately designed.

As shown in fig. 2, in the rotor 5b, the rotor weight 55, the 1 st plate 53, the rotor body 51, and the 2 nd plate 54 are arranged in this order from the front side in the direction of the driving axis O. Each magnetic core 52 is already provided in the rotor main body 51. In the rotor 5b, the fixing hole 51a of the rotor body 51 is aligned with the 1 st and 2

nd insertion holes

53a and 54a of the 1 st and 2

nd plates

53 and 54 in the driving axis O direction, and the through holes 51b of the rotor body 51 are aligned with the 1 st and 2 nd communication holes 53b and 54b of the 1 st and 2

nd plates

53 and 54 in the driving axis O direction. In the rotor 5b, the 1 st pin holes 555 to 558 of the rotor body 51 and the 2 nd and 3 rd pin holes 535 to 538, 545 to 548 of the 1 st and 2

nd plates

53, 54 are aligned in the driving axis O direction. Further, the 4 th pin holes 55a and 55b of the rotor weight 55 and the 2 nd and 3 rd pin holes 537, 538, 547, and 548 are aligned in the driving axis O direction. In this state, as shown in fig. 6, the fastening pins 56 are inserted into the 1 st to 4 th pin holes 555 to 558, 535 to 538, 545 to 548, 55a and 55b in the driving axis O direction, and the front ends and the rear ends of the fastening pins 56 are upset (caulked).

In this way, the rotor body 51, the 1 st and 2

nd plates

53 and 54, and the rotor weight 55 are fastened and integrated in the direction of the drive axis O in the rotor 5 b. That is, in the rotor 5b, the rotor body 51 is sandwiched by the 1 st and 2

nd plates

53 and 54 from both sides in the direction of the driving axis O. Thereby, in the rotor 5b, the electromagnetic steel sheets 510 constituting the rotor body 51 are prevented from being separated from each other.

Further, by sandwiching the rotor body 51 between the 1 st and 2

nd plates

53 and 54 from both sides in the driving axis O direction, the fixing hole 51a and the 1 st and 2

nd insertion holes

53a and 54a are in a state of communicating in the driving axis O direction. Further, the through holes 51b and the 1 st and 2 nd communication holes 53b and 54b are also in a state of communicating with each other in the direction of the driving axis O. Here, the through holes 51b and the 1 st and 2 nd communication holes 53b and 54b are partially closed by the rotor weight 55 on the 1 st plate 53 side, i.e., on the front side in the direction of the driving axis O.

As shown in fig. 6, in the rotor 5b, the 1 st constraining section 53d of the 1 st plate 53 is in surface contact with the specific region 511 of the rotor main body 51 from the front side in the driving axis O direction. Similarly, the 2 nd constraining portion 54d of the 2 nd plate 54 is in surface contact with the specific region 511 from the rear side in the driving axis O direction (see fig. 2). Thereby, the specific region 511 and further the rotor main body 51 are restrained in the driving axis O direction by the 1 st restraining portion 53d and the 2 nd restraining portion 54 d. On the other hand, as shown in fig. 6, each 1 st notch 53g of the 1 st plate 53 is not in contact with the specific region 511. Although not shown in detail, each 2 nd notch 54g of the 2 nd plate 54 is also similarly not in contact with the specific region 511. That is, in the portions where the 1 st and 2

nd notches

53g and 54g exist, the specific region 511 is not in contact with the 1 st plate 53 and the 2 nd plate 54, and is not restricted in the driving axis O direction.

Further, the 1 st outer peripheral portion 53e of the 1 st plate 53 and the 2 nd outer peripheral portion 54e of the 2 nd plate 54 are in surface contact with the outer peripheral region 512 of the rotor main body 51 from both sides in the driving axis O direction, respectively. Thus, the respective cores 52 provided in the rotor body 51 face the 1 st and 2

nd plates

53 and 54, more specifically, the 1 st and 2 nd outer

peripheral portions

53e and 54e in the driving axis O direction. Thus, the 1 st and 2 nd outer

peripheral portions

53e and 54e prevent the cores 52 from coming off from the housing holes 51c in the direction of the driving axis O. Each of the 1 st bridge parts 53f of the 1 st plate 53 and each of the 2 nd bridge parts 54f of the 2 nd plate 54 are in surface contact with each of the connection parts 513 of the rotor body 51 from the front-rear direction.

As shown in fig. 2 and 7, the drive shaft 3 is fixed to the rotor 5b in a fitting manner, more specifically, a shrink fit manner. In the case where the rotor 5b is shrink-fitted to the drive shaft 3, the rotor 5b is induction-heated. Specifically, the 1 st and 2

nd constraining sections

53d and 54d including the periphery of the fixing hole 51a, that is, the specific region 511 are heated by induction heating, and the fixing hole 51a is expanded in diameter by thermal expansion. In this state, the large diameter portion 3b is inserted into the fixing hole 51a and the 1 st and 2

nd insertion holes

53a and 54a in the driving axis O direction. In this way, the drive shaft 3 is fixed to the rotor 5b by fitting the large diameter portion 3b into the fixing hole 51 a. Thereby, the rotor 5b is integrated with the drive shaft 3 and can rotate integrally around the drive shaft center O. Since the 1 st and 2

nd insertion holes

53a and 54a are formed to have a diameter larger than that of the large diameter portion 3b, only the large diameter portion 3b is inserted into the 1 st and 2

nd insertion holes

53a and 54a, and the large diameter portion 3b is not fixed.

As the compression mechanism 7 shown in fig. 1, a known scroll-type compression mechanism is used. The compression mechanism 7 includes a fixed scroll fixed to the inner peripheral surface of the peripheral wall 11b at the rear side of the motor chamber 111 in the housing body 11, and a movable scroll disposed to face the fixed scroll and rotatable by the drive shaft 3. The fixed scroll is engaged with the movable scroll to form a compression chamber therebetween. The fixed scroll, the movable scroll, and the compression chamber are not shown.

In the electric compressor configured as described above, as indicated by the broken line arrows in fig. 2, the low-temperature and low-pressure refrigerant gas having passed through the evaporator is sucked into the motor chamber 111 from the suction port 11 c. Further, the motor mechanism 5 is supplied with power by an inverter circuit. Thereby, the rotor 5b rotates around the drive axis O together with the drive shaft 3, and the compression mechanism 7 operates. The refrigerant gas sucked into the motor chamber 111 flows from the 1 st plate 53 side through the 1 st communication holes 53b, the through holes 51b, and the 2 nd communication holes 54b, and is introduced into the compression mechanism 7. That is, in the electric compressor, each through hole 51b and each of the 1 st and 2 nd communication holes 53b and 54b function as an introduction passage for introducing the refrigerant gas into the compression mechanism 7. In this way, the refrigerant gas introduced into the compression mechanism 7 is compressed in the compression chamber, and is discharged from the discharge chamber to the condenser through the discharge port.

In the electric compressor, the stator 5a and the rotor 5b can be cooled by the refrigerant gas in the motor chamber 111. In the electric compressor, the rotor 5b can be appropriately cooled by the refrigerant gas flowing through the through holes 51b and the 1 st and 2 nd communication holes 53b and 54 b. Further, since each through hole 51b and each of the 1 st and 2 nd communication holes 53b and 54b function as an introduction passage, it is not necessary to provide a separate introduction passage in the housing main body 11.

In the electric compressor, it is desirable that the rotor 5b is not separated from the rotor body 51 due to the displacement of the rotor body 51 and the 1 st and 2

nd plates

53 and 54, and the magnetic steel plates 510 constituting the rotor body 51 are not separated from each other in the direction of the drive axis O. Therefore, in the electric compressor, the rotor body 51 and the 1 st and 2

nd plates

53 and 54 need to be firmly fastened and connected in the driving axis O direction by the fastening and connecting pins 56. Therefore, the peripheries of the fastening pins 56 are locally strongly pressed against the rotor body 51, that is, the magnetic steel sheets 510 and the 1 st and 2

nd plates

53 and 54. In this regard, in the electric compressor, even if the thickness of each electromagnetic steel plate 510 is thinner than the thickness of the 1 st and 2

nd plates

53 and 54, when the rotor body 51 and the 1 st and 2

nd plates

53 and 54 are fastened and connected in the driving axis O direction by the fastening and connecting pins 56, the inner peripheral surface of the fixing hole 51a is less likely to partially protrude inward. The operation and effect will be specifically described based on comparison with comparative examples.

As shown in fig. 8, in the electric compressor of the comparative example, the 1 st plate 53 of the rotor 5b has no 1 st cutout 53g formed between the 1 st insertion hole 53a and each 1 st communication hole 53 b. Although not shown, the 2 nd plate 54 does not have the 2 nd notch 54g between the 2 nd insertion hole 54a and each 2 nd communication hole 54 b.

Thus, in the electric compressor of the comparative example, the 1 st and 2

nd constraining sections

53d and 54d are not divided, and the 1 st and 2

nd constraining sections

53d and 54d are substantially annular. These 1 st and 2

nd constraining portions

53d and 54d are in surface contact with the specific region 511. In this way, in the electric compressor of the comparative example, substantially the entire specific region 511 is restricted by the 1 st and 2

nd restricting portions

53d and 54d from both sides in the driving axis O direction. The other configurations of the electric compressor of the comparative example are the same as those of the electric compressor of the embodiment, including the other configurations of the rotor 5b, and the same components are denoted by the same reference numerals and detailed descriptions of the components are omitted.

In the electric compressor of the comparative example, the rotor body 51, that is, the electromagnetic steel plates 510 are pressed in the driving axis O direction by fastening and connecting the rotor body 51 and the 1 st and 2

nd plates

53 and 54 in the driving axis O direction by the fastening and connecting pins 56. Here, the thickness of each electromagnetic steel sheet 510 is smaller than the thickness of the 1 st and 2

nd sheets

53 and 54. The substantially entire specific region 511 is restrained from both sides in the driving axis O direction by the 1 st and 2

nd restraining portions

53d and 54 d. Thus, in the electric compressor of the comparative example, each electromagnetic steel plate 510 including the specific region 511 cannot be deformed in the drive shaft center direction. That is, in each of the magnetic steel sheets 510, deformation due to a load when pressed in the driving axis O direction cannot be avoided in the driving axis O direction. Therefore, as shown in fig. 9, the fixing hole 51a is deformed to expand in the radial direction by a load when each of the magnetic steel sheets 510 is pressed in the driving axial center O direction. Specifically, a part of the magnetic steel sheet 510, that is, the connection portion 513 is present in a spoke shape to the fixing hole 51a in the radial direction of the magnetic steel sheet 510 toward the driving axis O without interposing the through hole 51b therebetween. Thus, the buckling (japanese: ひずみ) deformation caused by the pressing force locally acting around the 1 st pin hole 555 and the 1 st pin hole 556 propagates through the connection portion 513, that is, the spoke-shaped region in the electromagnetic steel sheet 510, and appears as a local protrusion around the fixing hole 51 a.

As a result, in the electric compressor of the comparative example, the inner peripheral surface of the fixing hole 51a is likely to partially protrude inward. Here, in the electric compressor of the comparative example, since the 1 st and 2

nd constraining sections

53d and 54d are heated by induction heating, the above-described deformation in the fixing hole 51a is more remarkable. Therefore, in the electric compressor of the comparative example, the large diameter portion 3b of the drive shaft 3 cannot be fitted into the fixing hole 51a properly, and the drive shaft 3 cannot be fixed to the rotor 5b properly.

In contrast, in the electric compressor of the embodiment, as shown in fig. 3 and 4, 1 st and 2

nd notches

53g and 54g are formed in the 1 st and 2

nd plates

53 and 54, respectively, in addition to the 1 st and 2

nd constraining portions

53d and 54 d. In the electric compressor according to the embodiment, as shown in fig. 2, 6, and 7, the 1 st and 2

nd constraining portions

53d and 54d are in contact with the specific region 511 to constrain the specific region 511 from both sides in the driving axis O direction, whereas the 1 st and 2

nd notches

53g and 54g are not in contact with the specific region 511. Thus, the 1 st and 2

nd notches

53g and 54g do not restrict the specific region 511 in the driving axis O direction. Therefore, in the electric compressor of the embodiment, the contact area between the 1 st and 2

nd constraining sections

53d and 54d and the specific region 511 is reduced by the presence of the 1 st and 2

nd notches

53g and 54 g. In particular, in the electric compressor of the embodiment, 5

notches

53g and 54g are formed in the 1 st and 2

nd plates

53 and 54, respectively. Therefore, the contact area of the 1 st constraining portion 53d with the specific region 511 as a whole is sufficiently small, and the contact area of the 2 nd constraining portion 54d with the specific region 511 as a whole is sufficiently small. As a result, in the electric compressor of the embodiment, when the rotor main body 51 and the 1 st and 2

nd plates

53 and 54 are fastened and connected in the driving axis O direction by the fastening and connecting pins 56, the restriction of the 1 st and 2

nd restricting portions

53d and 54d in the driving axis O direction of the specific region 511 is reduced.

Thus, in the electric compressor of the embodiment, when the rotor body 51 and the 1 st and 2

nd plates

53 and 54 are fastened and connected in the driving axis O direction by the fastening and connecting pins 56, the electromagnetic steel plates 510 are easily deformed in the driving axis O direction toward the 1 st notch 53g side and the 2 nd notch 54g side. That is, each of the magnetic steel sheets 510 can avoid deformation in the driving axis O direction due to a load when pressed in the driving axis O direction. Here, in the electric compressor of the embodiment, although the 1 st and 2

nd constraining sections

53d and 54d are heated by induction heating, the specific region 511 is also easily deformed in the driving axis O direction toward the 1 st notch 53g side and the 2 nd notch 54g side in this case. Therefore, as shown in fig. 6, in the electric compressor according to the embodiment, the inner peripheral surface of the fixing hole 51a is suppressed from locally protruding inward. As a result, as shown in fig. 7, in the electric compressor of the embodiment, the large diameter portion 3b can be appropriately fitted into the fixing hole 51 a.

Therefore, according to the electric compressor of the embodiment, the drive shaft 3 can be appropriately fixed to the rotor 5 b.

In particular, in the motor-driven compressor, the 1 st and 2

nd notches

53g and 54g penetrate the 1 st and 2

nd plates

53 and 54, respectively, in the driving axis O direction. Therefore, in the motor-driven compressor, the 1 st and 2

nd notches

53g and 54g can be formed simultaneously when the 1 st and 2 nd through

holes

53a and 54a, the 1 st and 2 nd communication holes 53b and 54b, and the 2 nd and 3 rd pin holes 535 to 538, 545 to 548 are formed in the 1 st and 2

nd plates

53 and 54. Further, for example, the 1 st and 2

nd plates

53 and 54 can be processed more easily than in the case where the 1 st and 2

nd insertion holes

53a and 54a and the 1 st and 2 nd communication holes 53b and 54b are formed in the 1 st and 2

nd plates

53 and 54, respectively, and the grooves are formed as the 1 st and 2

nd notches

53g and 54 g. Therefore, the productivity of the electric compressor is increased, and the manufacturing cost can be reduced accordingly.

In addition, the 1 st notch 53g cuts the 1 st constraining section 53d in the radial direction of the 1 st plate 53, and the 2 nd notch 54g cuts the 2 nd constraining section 54d in the radial direction of the 2 nd plate 54. Thus, in the electric compressor, while the rigidity, which is the restraining force required to prevent the separation of the magnetic steel plates 510 by the 1 st and 2

nd plates

53 and 54 and/or the falling off of the magnetic cores 52 from the housing holes 51c, can be ensured, the rigidity of the 1 st and 2

nd restraining portions

53d and 54d as a whole can be appropriately reduced by dividing the 1 st and 2

nd restraining portions

53d and 54d into 5 pieces. In this regard, in the electric compressor, the restriction of the 1 st and 2

nd restricting portions

53d and 54d in the driving axis O direction of the specific region 511 can be appropriately reduced.

In the electric compressor, 5 through holes 51b are formed in the rotor main body 51 on the outer periphery of the fixing hole 51 a. In the 1 st and 2

nd plates

53 and 54, 5

communication holes

53b and 54b are formed in the 1 st and 2 nd plates, respectively, corresponding to the through holes 51b, respectively. Thus, in the electric compressor, the refrigerant gas sucked into the motor chamber 111 can appropriately flow through the through holes 51b and the 1 st and 2 nd communication holes 53b and 54 b. Thus, in the electric compressor, the flow rate of the refrigerant gas flowing through the rotor 5b can be increased appropriately, and the refrigerant gas can be introduced into the compression mechanism 7 appropriately. In the electric compressor, the flow rate of the refrigerant gas flowing through the rotor 5b is increased, so that the rotor 5b can be sufficiently cooled by the refrigerant gas.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the embodiments, and can be applied by appropriately changing the embodiments without departing from the scope of the present invention.

For example, in the electric compressor of the embodiment, the 1 st and 2

nd notches

53g and 54g penetrate the 1 st and 2

nd plates

53 and 54 in the driving axis O direction. However, the present invention is not limited to this, and the 1 st and 2

nd notches

53g and 54g may be formed without penetrating the 1 st and 2

nd plates

53 and 54 in the driving axis O direction, like the concave groove.

In addition to the fixing hole 51a, the large diameter portion 3b of the drive shaft 3 may be fixed to the 1 st insertion hole 53a and the 2 nd insertion hole 54 a.

Further, when the large diameter portion 3b of the drive shaft 3 is shrink-fitted to the fixing hole 51a, the rotor 5b may be heated by using a heating furnace or the like instead of induction heating.

Instead of the shrink fit, the large diameter portion 3b of the drive shaft 3 may be fitted into the fixing hole 51a by press fitting or the like.

Further, as the compression mechanism 7, a vane type compression mechanism, a swash plate type compression mechanism, or the like may be employed.

The compression mechanism 7 may compress a fluid other than the refrigerant gas.

In the electric compressor according to the embodiment, the through holes 51b and the 1 st and 2 nd communication holes 53b and 54b function as refrigerant gas introduction passages, whereby the refrigerant gas sucked into the motor chamber 111 flows through the through holes 51b and the 1 st and 2 nd communication holes 53b and 54b, and the rotor 5b is cooled by the refrigerant gas. However, the present invention is not limited to this, and the through holes 51b and the 1 st and 2 nd communication holes 53b and 54b may be caused to function as weight reduction portions for reducing the weight of the rotor 5b by sucking the refrigerant gas into a place other than the motor chamber 111 in the casing 1.

The 1 st pin holes 555 to 558 may be arranged between the through holes 51b adjacent in the circumferential direction of the fixed hole 51a without being arranged on the outer circumferential side of the electromagnetic steel sheet 510 with respect to the through holes 51b, that is, the 1 st pin holes 555 to 558 may be arranged in the connection portions 513. Accordingly, the 2 nd pin holes 535 to 538 and the 3 rd pin holes 545 to 548 may be configured to be disposed in the 1 st bridge portion 53f and the 2 nd bridge portion 54f, respectively.

Industrial applicability

The present invention can be used for an air conditioning apparatus for a vehicle or the like.

Claims

1. An electric compressor is provided with:

a housing;

a drive shaft disposed within the housing and rotatable about a drive axis;

a motor mechanism disposed within the housing and rotating the drive shaft; and

the electric compressor is characterized in that it is provided with,

2. The motor-driven compressor according to claim 1,

the notch penetrates the plates in the direction of the driving axis.