Motor compressor

Abstract

To provide a motor compressor which is excellent in quietness and vibration control performance during operation while achieving reduction of the price.SOLUTION: A motor compressor of the invention includes a housing 1, a drive shaft 3, a motor device 5, and a compressor mechanism 7. The motor device 5 includes a stator 5a, a rotor 5b, and a collar 5c. The drive shaft 3 has a seating surface 301. The rotor 5b has a rotor body 51, a first end plate 53, and a second end plate 54. The rotor body 51 comprises a plurality of magnetic steel sheets 510 laminated in a drive axis O direction. The collar 5c is provided with a balance weight 5d. An adjustment part 59 is disposed between the collar 5c and the rotor body 51. The adjustment part 59 can adjust a position of the collar 5c in a drive axis O direction relative to the drive shaft 3 while deforming in the drive axis O direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an electric compressor.

Background Art

[0002] Patent Document 1 discloses a conventional electric compressor. This electric compressor includes a housing, a drive shaft, a motor device, and a compression mechanism. The drive shaft, the motor device, and the compression mechanism are provided inside the housing. The drive shaft is rotatable around the drive shaft center inside the housing. The motor device rotates the drive shaft. The compression mechanism compresses a fluid when driven by the drive shaft.

[0003] The motor device has a stator fixed inside the housing and a rotor fixed to the drive shaft. The rotor has a rotor body, a first end plate, a second end plate, and a caulking pin.

[0004] The rotor body is composed of a plurality of electromagnetic steel sheets, and these electromagnetic steel sheets are laminated in the drive shaft center direction of the drive shaft. The first end plate is disposed on one side of the rotor body in the drive shaft center direction. The second end plate is disposed on the other side of the rotor body in the drive shaft center direction. The caulking pin extends in the drive shaft center direction and is inserted through the rotor body, the first end plate, and the second end plate.

[0005] In this electric compressor, while the rotor body is clamped in the drive shaft center direction by the first end plate and the second end plate, the first end plate, the rotor body, and the second end plate are fixed by the caulking pin. Further, at this time, in this electric compressor, balance weights are fixed to the first end plate and the second end plate respectively by the caulking pin.

[0006] Generally, as shown in Patent Document 2, the rotor is fixed to the drive shaft. In Patent Document 2, the drive shaft has a seating surface. Then, by inserting the rotor through the drive shaft from one side in the drive shaft axis direction, the seating surface abuts against the rotor in a state where it is located on the other side in the drive shaft axis direction with respect to the rotor. Further, in this state, a collar is attached to the drive shaft from one side in the drive shaft axis direction. Thereby, the rotor is fixed to the drive shaft while being clamped in the drive shaft axis direction by the seating surface and the collar.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] In this type of electric compressor, reduction of manufacturing costs is required. Therefore, in the above - mentioned conventional electric compressor, it is conceivable to provide a collar integrated with a balance weight on the drive shaft. Thereby, compared with the case of separately attaching the collar to the drive shaft and attaching the balance weight to the drive shaft, the manufacturing efficiency can be improved, and thus the cost reduction of the electric compressor can be achieved.

[0009] By the way, the rotor body is formed by laminating a plurality of electromagnetic steel sheets in the drive shaft axis direction, and there are tolerances in the plate thickness of each electromagnetic steel sheet. For this reason, there are inevitable variations in the length of the rotor body in the drive shaft axis direction, and thus in the attachment position of the collar on the drive shaft in a state where the rotor body is clamped in the drive shaft axis direction by the seating surface and the collar.

[0010] As a result, when the balance weight is provided for the color as described above, variations also occur in the attachment position of the balance weight to the drive shaft, making it impossible to attach the balance weight to the drive shaft at the originally designed position. For this reason, in such an electric compressor, the balance weight cannot properly balance the drive shaft that rotates around the drive shaft axis, resulting in increased noise and vibration during operation.

[0011] The present invention has been made in view of the above-described conventional circumstances, and an object to be solved is to provide an electric compressor that is excellent in quietness and vibration damping during operation while achieving cost reduction.

Means for Solving the Problem

[0012] The electric compressor of the present invention includes a housing and, a drive shaft provided in the housing and rotatable around a drive shaft axis, a motor device provided in the housing for rotating the drive shaft, and a compression mechanism provided in the housing and driven by the drive shaft to compress a fluid, and is an electric compressor comprising: the motor device having a stator fixed in the housing, a rotor attached to the drive shaft, and a collar attached to the drive shaft and contacting the rotor on one side in the drive shaft axis direction, the drive shaft contacting the rotor on the other side in the drive shaft axis direction and having a seating surface that defines the position of the rotor in the drive shaft axis direction with respect to the drive shaft, the rotor having a rotor body composed of a plurality of electromagnetic steel sheets laminated in the drive shaft axis direction, a first end plate disposed on one side of the rotor body in the drive shaft axis direction, and a second end plate disposed on the other side of the rotor body in the drive shaft axis direction and sandwiching the rotor body in the drive shaft axis direction between the first end plate and the second end plate, the collar being provided with a balance weight, Between the collar and the rotor body, an adjustment unit is arranged that can adjust the position of the collar in the driving axis direction with respect to the driving shaft while deforming in the driving axis direction. This is the gist of the invention.

[0013] In the electric compressor of the present invention, since a balance weight is provided on the collar, when the collar is attached to the drive shaft, the balance weight can be attached to the drive shaft at the same time. Thereby, in this electric compressor, the manufacturing efficiency can be improved as compared with the case where the attachment of the collar to the drive shaft and the attachment of the balance weight to the drive shaft are performed separately. Here, "a balance weight is provided on the collar" means, for example, integrally molding the balance weight with respect to the collar, or integrating the collar and the balance weight while forming the collar and the balance weight separately.

[0014] Also, in this electric compressor, an adjustment unit is arranged between the collar and the rotor body. This adjustment unit can adjust the position of the collar in the driving axis direction with respect to the driving shaft while deforming in the driving axis direction between the collar and the rotor body. Thereby, in this compressor, even if there is a variation in the length of the rotor body in the driving axis direction due to the tolerance of the plate thickness of each electromagnetic steel sheet, the adjustment unit deforms in the driving axis direction, so that the variation in the mounting position of the collar with respect to the driving shaft can be absorbed. For this reason, in this electric compressor, the variation in the mounting position of the collar with respect to the driving shaft, and thus the variation in the mounting position of the balance weight with respect to the driving shaft, can be made as small as possible. As a result, in this electric compressor, the balance weight can preferably balance the drive shaft that rotates around the driving axis.

[0015] Therefore, the electric compressor of the present invention is excellent in quietness and vibration damping during operation while achieving cost reduction.

[0016] The balance weight is preferably integrally formed with the collar. In this case, the number of components can be reduced compared to the case where the balance weight and the collar are separate components, so that the manufacturing efficiency can be further improved. Therefore, in this electric compressor, further cost reduction can be achieved.

[0017] The adjustment portion may be provided on the collar and have a plurality of protrusions that project in the driving axis direction from the collar toward the rotor body. And each protrusion is arranged in the circumferential direction of the driving shaft with respect to the collar. In this case, the adjustment portion can be easily formed with respect to the collar.

[0018] Further, it is preferable that each protrusion is formed with a through hole that penetrates the protrusion in a direction intersecting the driving axis direction. In this case, since the rigidity of the protrusion can be adjusted by the through hole, each protrusion can be suitably deformed in the driving axis direction.

[0019] Also, it is also preferable that each protrusion has a base end portion that protrudes toward the rotor body while being connected to the collar, and a tip end portion that is connected to the base end portion and protrudes toward the outside in the radial direction of the collar from the base end portion. In this case as well, each protrusion can be suitably deformed in the driving axis direction.

[0020] Also, it is preferable that a plurality of adjustment portions are provided on the first end plate. In this case as well, the adjustment portion can be easily formed.

[0021] The balance weight preferably has a first balance weight provided on the collar, and a second balance weight provided on the second end plate or the drive shaft and arranged on the opposite side in the driving axis direction with the rotor body interposed between the first balance weight and the second balance weight. In this case, the drive shaft that rotates around the driving axis can be more suitably balanced by the first balance weight and the second balance weight.

Advantages of the Invention

[0022] The electric compressor of the present invention realizes cost reduction and is excellent in quietness and vibration damping during operation.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Modes for Carrying Out the Invention

[0024] Hereinafter, Examples 1 to 6 embodying the present invention will be described with reference to the drawings. The electric compressors of Examples 1 to 6 are specifically scroll type electric compressors. This electric compressor is mounted on a vehicle (not shown) and constitutes a refrigeration circuit of the vehicle.

[0025] (Example 1) As shown in FIG. 1, the electric compressor of Example 1 includes a housing 1, a drive shaft 3, a motor device 5, and a compression mechanism 7. The housing 1 has a housing main body 11, a first cover 13, and a second cover 15.

[0026] In the present embodiment, the front-rear direction of the electric compressor is defined by the solid arrows shown in FIG. 1. And in FIG. 2 and later, corresponding to FIG. 1, the front-rear direction of the electric compressor is defined. The front-rear direction is an example of the "drive shaft center direction" in the present invention. Here, in Examples 1 to 4, the rear of the electric compressor corresponds to "one side of the drive shaft center direction" in the present invention, and the front of the electric compressor corresponds to "the other side of the drive shaft center direction" in the present invention. Note that these directions are examples for convenience of explanation, and the posture of the electric compressor is appropriately changed according to the vehicle or the like on which it is mounted.

[0027] As shown in FIG. 1, the housing main body 11 has a front wall 11a and a peripheral wall 11b. The front wall 11a is located at the rear 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 shaft center O of the drive shaft 3. By these front wall 11a and peripheral wall 11b, the housing main body 11 forms a bottomed cylindrical shape extending in the drive shaft center O direction, that is, the front-rear direction of the electric compressor.

[0028] As shown in FIG. 2, a motor chamber 111 is formed inside the housing body 11. Although not shown, a suction port is formed in the housing body 11. The suction port is connected to the condenser by a pipe. Thereby, the refrigerant gas is inhaled into the motor chamber 111 from the outside of the housing body 11 through the suction port. That is, in this electric compressor, the motor chamber 111 also functions as a suction chamber for the refrigerant gas. The refrigerant gas is an example of the "fluid" in the present invention.

[0029] Furthermore, as shown in FIG. 1, a plurality of bolt holes 11c are formed in the housing body 11. Each bolt hole 11c opens at the rear end of the housing body 11 and extends forward inside the housing body 11. In FIG. 1, one of the plurality of bolt holes 11c is shown.

[0030] The first cover 13 is located on the front side of the housing body 11. The first cover 13 is fixed to the front wall 11a of the housing body 11 by a plurality of bolts (not shown). The first cover 13 is formed in a bottomed cylindrical shape and houses an inverter circuit (not shown) inside.

[0031] The second cover 15 is located on the rear side of the housing body 11. The second cover 15 is fixed to the rear end of the housing body 11 by bolts 15a respectively inserted into the bolt holes 11c. In FIG. 1, one of the plurality of bolts 15a is shown. The second cover 15 is formed in a bottomed cylindrical shape, and a discharge chamber (not shown) is formed inside. The discharge chamber is connected to the condenser (not shown) by a pipe (not shown).

[0032] As shown in FIGS. 1 and 2, the drive shaft 3 is provided inside the housing body 11 including inside the motor chamber 111. As shown in FIG. 2, the drive shaft 3 is composed of a drive shaft body 3a and a flange portion 3b. The drive shaft body 3a is formed in a columnar shape extending in the direction of the drive shaft center O.

[0033] The flange portion 3b is integrally formed with the drive shaft main body 3a and is disposed at a location closer to the front in the drive shaft main body 3a. The flange portion 3b is formed with a larger diameter than the drive shaft main body 3a and protrudes in a disk shape toward the outside in the radial direction of the drive shaft 3 from the drive shaft main body 3a.

[0034] The flange portion 3b has a seating surface 301. The seating surface 301 faces the rear of the drive shaft 3. The seating surface 301 constitutes the rear surface of the flange portion 3b. Further, the flange portion 3b has a front surface 302 located on the opposite side of the seating surface 301.

[0035] The drive shaft 3 is rotatably supported by the front wall 11a of the housing main body 11 via a bearing (not shown) with the drive shaft main body 3a. Thereby, the drive shaft 3 is rotatable around the drive shaft center O within the motor chamber 111.

[0036] The motor device 5 is provided within the motor chamber 111. The motor device 5 has a stator 5a, a rotor 5b, and a collar 5c. The stator 5a is fixed to the inner peripheral surface of the peripheral wall 11b within the motor chamber 111. The stator 5a is connected to an inverter circuit.

[0037] 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 forms an annular shape protruding forward and backward in the direction of the drive shaft center O from the stator core 501.

[0038] The rotor 5b is disposed within the stator 5a. The rotor 5b has a rotor main body 51, a plurality of magnet cores 52, a first end plate 53, a second end plate 54, a second balance weight 55, and a plurality of fastening pins 56.

[0039] The rotor body 51 is formed by a plurality of electromagnetic steel sheets 510 formed in a disk shape. More specifically, the rotor body 51 is formed by laminating each electromagnetic steel sheet 510 in the direction of the drive axis O. At the center of each electromagnetic steel sheet 510, that is, at the center of the rotor body 51, a mounting hole 51a is formed. Further, in each electromagnetic steel sheet 510, a plurality of ventilation holes 51b are formed on the outer peripheral side of the mounting hole 51a.

[0040] Furthermore, in each electromagnetic steel sheet 510, a plurality of first pin holes 51c and a plurality of accommodation holes 51d are formed on the outer peripheral side of each ventilation hole 51b. The mounting hole 51a, each ventilation hole 51b, each first pin hole 51c, and each accommodation hole 51d penetrate the electromagnetic steel sheet 510 in the direction of the drive axis O, respectively. Also, the mounting hole 51a, each ventilation hole 51b, each first pin hole 51c, and each accommodation hole 51d are spaced apart from each other and are not in communication with each other.

[0041] The electromagnetic steel sheets 510 are aligned with each other in the direction of the drive axis O with respect to the mounting holes 51a, and are also aligned with each other in the direction of the drive axis O with respect to the ventilation holes 51b, the first pin holes 51c, and the accommodation holes 51d. As a result, in the rotor body 51, the mounting hole 51a, each ventilation hole 51b, each first pin hole 51c, and each accommodation hole 51d are in a state of penetrating in the direction of the drive axis O, respectively. In FIG. 2, for ease of explanation, in addition to the plate thickness of each electromagnetic steel sheet 510, the number of each electromagnetic steel sheet 510, etc. are simplified and illustrated. The same applies to FIGS. 5, 7, 10, and 12 described later.

[0042] As shown in FIG. 2, each magnet core 52 is formed in a columnar shape extending in the direction of the drive axis O. The length of each magnet 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. Each magnet core 52 is respectively accommodated in each accommodation hole 51d.

[0043] The first end plate 53 is located on the rear side with respect to the rotor main body 51. The first end plate 53 is formed of a disk-shaped metal plate material. More specifically, the first end plate 53 is formed of a plate material that is thicker in the direction of the drive axis O than each electromagnetic steel plate 510. That is, the first end plate 53 is thicker than each electromagnetic steel plate 510.

[0044] A first communication hole 53a is formed at the center of the first end plate 53. The first communication hole 53a penetrates the first end plate 53 in the direction of the drive axis O. Here, the first communication hole 53a is formed to have a larger diameter than the mounting hole 51a, and each adjustment part 59 can enter therein. Each adjustment part 59 will be described later.

[0045] Also, in the first end plate 53, on the outer peripheral side of the first communication hole 53a, a second communication hole 53b having the same number as each ventilation hole 51b and a second pin hole 53c having the same number as each first pin hole 51c are formed. Each second communication hole 53b and each second pin hole 53c are arranged at positions corresponding to each ventilation hole 51b and each first pin hole 51c, respectively, and penetrate the first end plate 53 in the direction of the drive axis O.

[0046] The second end plate 54 is located on the front side with respect to the rotor main body 51. Similar to the first end plate 53, the second end plate 54 is also formed of a plate material that is thicker in the direction of the drive axis O than each electromagnetic steel plate 510.

[0047] A third communication hole 54a is formed at the center of the second end plate 54. The third communication hole 54a penetrates the second end plate 54 in the direction of the drive axis O. Here, the third communication hole 54a is formed to have the same diameter as the first communication hole 53a and has a larger diameter than the mounting hole 51a. The third communication hole 54a allows the flange portion 3b of the drive shaft 3 to enter therein.

[0048] Further, in the second end plate 54, on the outer peripheral side of the third communication hole 54a, a fourth communication hole 54b having the same number as each ventilation hole 51b and a third pin hole 54c having the same number as each first pin hole 51c are formed. Each fourth communication hole 54b and each third pin hole 54c are disposed at positions corresponding to each ventilation hole 51b and each first pin hole 51c, respectively, and penetrate the second end plate 54 in the direction of the drive axis O.

[0049] The second balance weight 55 is formed of a metal plate material and has a substantially arc shape along the shape of the second end plate 54. The second balance weight 55 is set to have a greater plate thickness than the first and second plates 53 and 54. Note that the shape and plate thickness of the second balance weight 55 can be designed as appropriate.

[0050] As shown in FIG. 2, in the rotor 5b, the second balance weight 55, the second end plate 54, the rotor body 51, and the first end plate 53 are arranged in this order from the front side to the rear side.

[0051] Further, in the rotor 5b, the mounting hole 51a of the rotor body 51, the first communication hole 53a of the first end plate 53, and the third communication hole 54a of the second end plate 54 are aligned in the direction of the drive axis O. Further, in the rotor 5b, each ventilation hole 51b of the rotor body 51, each second communication hole 53b of the first end plate 53, and each fourth communication hole 54b of the second end plate 54 are aligned in the direction of the drive axis O. Also, in the rotor 5b, each first pin hole 51c of the rotor body 51, each second pin hole 53c of the first end plate 53, and each third pin hole 54c of the second end plate 54 are aligned in the direction of the drive axis O.

[0052] In this state, in the rotor 5b, fastening pins 56 are inserted into each of the first pin holes 51c, each of the second pin holes 53c, and each of the third pin holes 54c in the direction of the drive axis O. Then, by caulking the front and rear ends of each of the connecting pins 56, in the rotor 5b, the rotor body 51, the first end plate 53, and the second end plate 54 are fastened and integrated in the direction of the drive axis O. Thus, in the rotor 5b, the rotor body 51, the first and second plates 53 and 54, and the second balance weight 55 are fastened and integrated in the direction of the drive axis O.

[0053] Also, among a plurality of fastening pins 56, the front ends of some of them are caulked in a state of being inserted through the second balance weight 55 as well. Thereby, in the rotor 5b, the second balance weight 55 is fastened to the second end plate 54 by the fastening pins 56.

[0054] In this way, in the rotor 5b, since the rotor body 51, the first and second plates 53 and 54 are fastened in the direction of the drive axis O, the rotor body 51 is clamped from both sides in the direction of the drive axis O by the first and second plates 53 and 54. For this reason, in the rotor 5b, separation between the electromagnetic steel sheets 510 constituting the rotor body 51 is prevented. Also, in the rotor 5b, the housing holes 51d of the rotor body 51 are blocked from both sides in the direction of the drive axis O by the first and second plates 53 and 54. Thereby, in the rotor 5b, the magnets 52 are also prevented from falling out of the housing holes 51d.

[0055] Also, since the rotor body 51 is clamped from both sides in the direction of the drive axis O by the first and second plates 53 and 54, the mounting holes 51a, the first and third communication holes 53a and 54a are in a state of being in communication in the direction of the drive axis O. Further, the ventilation holes 51b and the second and fourth communication holes 53b and 54b are also in a state of being in communication in the direction of the drive axis O.

[0056] The collar 5c is made of metal. As shown in FIGS. 3 and 4, the collar 5c has a front end face 511 facing forward and a rear end face 512 located on the opposite side of the front end face 511 and facing rearward. Further, a fixing hole 513 is formed in the collar 5c. The fixing hole 513 penetrates the collar 5c in the direction of the drive axis O. Thereby, the collar 5c has a substantially annular shape. The fixing hole 513 is formed to have a slightly smaller diameter than the drive shaft main body 3a. Thereby, the fixing hole 513 can be fixed to the drive shaft main body 3a by press-fitting the drive shaft main body 3a of the drive shaft 3.

[0057] A first balance weight 5d is integrally formed on the collar 5c. More specifically, the first balance weight 5d is also made of metal like the collar 5c, and is integrally formed at a location on the outer periphery of the collar 5c rather than the fixing hole 513. The first balance weight 5d is thicker than the collar 5c and is formed in a substantially arc shape. Thereby, the first balance weight 5d has a shape that protrudes substantially arcuately rearward from the rear end face 512 of the collar 5c in a state of being integrally formed with the collar 5c. Note that the shape and thickness of the first balance weight 5d can be designed as appropriate.

[0058] Further, an adjustment portion 59 is provided on the collar 5c. The adjustment portion 59 consists of four protrusions 590. Each protrusion 590 is made of metal like the collar 5c and is integrally formed on the front end face 511 of the collar 5c. Each protrusion 590 has the same shape and is arranged at equal intervals in the circumferential direction of the drive shaft 3 on the outer peripheral side of the fixing hole 513. And each protrusion 590 extends in a plate shape forward from the front end face 511 while curving arcuately along the outer edge of the fixing hole 513. Here, the thickness of each protrusion 590, that is, the plate thickness of each protrusion 59, is formed thinner than the thickness of the collar 5c. Note that the number of the protrusions 590 can be designed as appropriate.

[0059] In addition, each protrusion 590 is formed with a through hole 590a. The through hole 590a has an elliptical shape and penetrates the protrusion 590 in a direction perpendicular to the driving axis O direction. That is, the through hole 590a penetrates the protrusion 590 in the radial direction of the driving shaft 3. Thus, each protrusion 590 has a thickness thinner than the thickness of the collar 5c and is formed with a through hole 590a. Although it is made of metal like the collar 5c, its rigidity is lower than that of the collar 5c. Note that the shape of the through hole 590a and the number formed on the protrusion 590 can be appropriately designed according to the rigidity required for each protrusion 590, that is, the adjustment unit 59.

[0060] As shown in FIG. 2, in this electric compressor, the rotor 5b and the collar 5c are attached to the drive shaft 3 as follows. First, as described above, with the rotor body 51, the first and second plates 53 and 54, and the second balance weight 55 integrated in the driving axis O direction by each connecting pin 56, the rotor 5b is inserted into the drive shaft body 3a from the rear end of the drive shaft 3 as shown in FIG. 5. Then, by moving the rotor 5b forward toward the drive shaft body 3a, the flange portion 3b of the drive shaft 3 enters the third communication hole 54a of the second end plate 54. As a result, the seating surface 301 of the flange portion 3b abuts against the rotor body 51 from the front within the third communication hole 54a. As a result, the position of the rotor 5b in the driving axis O direction with respect to the drive shaft 3 is defined. Further, by fitting a key (not shown) into the mounting hole 51a, the rotor 5b is fixed to the drive shaft body 3a. Note that the rotor 5b may be fixed to the drive shaft body 3a by press-fitting the drive shaft body 3a into the mounting hole 51a.

[0061] Next, with the rotor 5b fixed to the drive shaft body 3a, the collar 5c is moved forward along the drive shaft body 3a while being press-fitted into the drive shaft body 3a from the rear end of the drive shaft 3. As a result, each protrusion 590 of the collar 5c enters the first communication hole 53a of the first end plate 53 and abuts against the rotor body 51 from the rear. Thus, the collar 5c is attached to the drive shaft body 3a while sandwiching the rotor 5b in the driving axis O direction between the seating surface 301 of the flange portion 3b and thus the flange portion 3b.

[0062] Also, since the color 5c is attached to the drive shaft main body 3a in this way, in this electric compressor, the first balance weight 5d is attached to the drive shaft main body 3a integrally with the color 5c. Thus, in this electric compressor, the first balance weight 5d is arranged on the opposite side of the drive shaft center O with the rotor main body 51 interposed therebetween with respect to the second balance weight 55. Here, in this electric compressor, the first balance weight 5d and the second balance weight 55 are arranged such that when the motor device 5 is viewed from the direction of the drive shaft center O, the first balance weight 5d and the second balance weight 55 are in a state of being displaced in the circumferential direction of the drive shaft 3. The details of the attachment of the color 5c and the first balance weight 5d to the drive shaft main body 3a will be described later.

[0063] As the compression mechanism 7 shown in FIG. 1, a known scroll type compression mechanism is adopted. The compression mechanism 7 has, inside the housing main body 11, a fixed scroll fixed to the inner peripheral surface of the peripheral wall 11b on the rear side of the motor chamber 111 and a movable scroll arranged to face the fixed scroll and rotatable by the drive shaft 3. The fixed scroll and the movable scroll mesh with each other to form a compression chamber therebetween. Note that the illustration of the fixed scroll, the movable scroll, and the compression chamber is omitted.

[0064] In this electric compressor configured as described above, when power is supplied to the stator 5a by the inverter circuit, the rotor 5b rotates around the drive shaft center O together with the drive shaft 3. As a result, the compression mechanism 7 operates. Further, the refrigerant gas sucked into the motor chamber 111 flows from the second end plate 54 side through each of the fourth communication holes 54b, each of the ventilation holes 51b, and each of the second communication holes 53b and is introduced into the compression mechanism 7. That is, in this electric compressor, each of the ventilation holes 51b and each of the second and fourth communication holes 53b and 54b function as introduction passages for introducing the refrigerant gas into the compression mechanism 7. Thus, the refrigerant gas introduced into the compression mechanism 7 is compressed in the compression chamber and discharged from the discharge port through the discharge chamber to the condenser.

[0065] Here, in this electric compressor, since the first balance weight 5d is integrally formed with the collar 5c, if the collar 5c is attached while being press-fitted onto the drive shaft main body 3a, the first balance weight 5d can be simultaneously attached to the drive shaft main body 3a. As a result, in this electric compressor, the manufacturing efficiency is higher compared to the case where the attachment of the collar 5c to the drive shaft main body 3a and the attachment of the first balance weight 5d to the drive shaft main body 3a are performed separately. Therefore, in this electric compressor, the manufacturing cost can be reduced.

[0066] By the way, in this electric compressor, the rotor main body 51 is formed by laminating a plurality of electromagnetic steel sheets 510 in the direction of the drive shaft center O. Here, there are inevitable tolerances in the length of each electromagnetic steel sheet 510 in the direction of the drive shaft center O, that is, the plate thickness of each electromagnetic steel sheet 510. For this reason, as shown in FIG. 5, in the electric compressor, although the length of the rotor main body 51 in the direction of the drive shaft center O is designed to be the first length L1, actually, the length of the rotor main body 51 in the direction of the drive shaft center O is not uniform at the first length L1, and inevitable variations occur. As a result, there are also inevitable variations in the length of the rotor 5b including the rotor main body 51 in the direction of the drive shaft center O.

[0067] Due to this, there is a concern that variations may also occur in the mounting position of the collar 5c with respect to the drive shaft main body 3a, and consequently, in the mounting position of the first balance weight 5d with respect to the drive shaft main body 3a, due to the variation in the length of the rotor main body 51 in the direction of the drive shaft center O. That is, in this electric compressor, since the collar 5c is attached to the drive shaft main body 3a while bringing each protrusion 590, that is, the adjustment part 59, into contact with the rotor main body 51, if the collar 5c is simply attached to the drive shaft main body 3a at the position where each protrusion 590 contacts the rotor main body 51, due to the variation in the length of the rotor main body 51 in the direction of the drive shaft center O, variations will also occur in the mounting position of the collar 5c with respect to the drive shaft main body 3a, and further, in the mounting position of the first balance weight 5d with respect to the drive shaft main body 3a.

[0068] More specifically, even if it is originally designed to attach the collar 5c and the first balance weight 5d to the drive shaft body 3a so that the rear end of the first balance weight 5d aligns with the reference point P1 of the drive shaft body 3a, when the driving axis O direction of the rotor body 51 is shorter than the first length L1, the collar 5c and the first balance weight 5d are attached to the drive shaft body 3a with the rear end of the first balance weight 5d positioned forward of the reference point P1. Conversely, when the driving axis O direction of the rotor body 51 is longer than the first length L1, the collar 5c and the first balance weight 5d are attached to the drive shaft body 3a with the rear end of the first balance weight 5d positioned rearward of the reference point P1.

[0069] In this regard, in this electric compressor, the rigidity of each protrusion 590 is lower than the rigidity of the collar 5c. Therefore, in this electric compressor, with each protrusion 590 in contact with the rotor body 51, the collar 5c is brought closer to the rotor 5b as shown by the white arrow in FIG. 5. That is, with each protrusion 590 in contact with the rotor body 51, the collar 5c is press-fitted more forward. As a result, as shown in FIG. 2, each protrusion 590 deforms so as to buckle in the driving axis O direction between the collar 5c and the rotor body 51. Thus, in this electric compressor, the position of the collar 5c in the driving axis O direction can be adjusted by the deformation of each protrusion 590, that is, the adjustment unit 59.

[0070] Therefore, in this electric compressor, even if there is a variation in the length of the rotor body 51 in the driving axis O direction, the adjustment unit 59 deforms in the driving axis O direction to absorb the variation in the mounting position of the collar 5c with respect to the drive shaft body 3a. As a result, in this electric compressor, the variation in the mounting position of the first balance weight 5d with respect to the drive shaft body 3a can be made as small as possible.

[0071] Thus, in this electric compressor, even if there are variations in the length in the direction of the drive axis O in the rotor body 51, the collar 5c and the first balance weight 5d can be attached to the drive shaft body 3a such that the rear ends of the first balance weights 5d are substantially aligned with the reference point P1 of the drive shaft body 3a. As a result, in this electric compressor, the dynamic balance of the drive shaft 3 rotating around the drive axis O can be suitably adjusted by the first balance weight 5d.

[0072] Therefore, the electric compressor of Example 1 is excellent in quietness and vibration damping during operation while achieving cost reduction.

[0073] In particular, in this electric compressor, since the first balance weight 5d is integrally formed with the collar 5c, the attachment work of the first balance weight 5d to the collar 5c, including the positioning work of the first balance weight 5d with respect to the collar 5c, is not required while reducing the number of parts. For this reason, in this electric compressor, while improving the manufacturing efficiency, the collar 5c and the first balance weight 5d can be easily attached to the drive shaft body 3a integrally. Further, since each adjustment portion 59 is also integrally formed with the collar 5c, the number of parts can be suitably reduced in this respect as well in this electric compressor.

[0074] Further, the adjustment portion 59 is composed of four protrusions 590. Each protrusion 590 is formed in a plate shape, and a through hole 590a is formed in each protrusion 590. For this reason, in this electric compressor, since the rigidity of each protrusion 590 can be suitably adjusted, each protrusion 590, that is, the adjustment portion 59 can be suitably deformed in the direction of the drive axis O between the collar 5c and the rotor body 51 by the press-fitting load when the collar 5c is press-fitted into the drive shaft body 3a. Here, each protrusion 590 is adjusted in rigidity so as not to be deformed by the vibration load generated during the operation of the electric compressor although it is deformed by the press-fitting load of the collar 5c.

[0075] In addition, in the rotor 5b of this electric compressor, since each vent hole 51b and each second and fourth communication holes 53b, 54b function as an introduction passage for introducing the refrigerant gas into the compression mechanism 7, there is no need to form a dedicated introduction passage for the refrigerant gas within the housing main body 11. Further, in this electric compressor, the rotor 5b can be suitably cooled by the refrigerant gas flowing through each vent hole 51b and each second and fourth communication holes 53b, 54b. Furthermore, in this electric compressor, the static balance of the drive shaft 3 can be suitably adjusted by the second balance weight 55 provided on the second end plate 54.

[0076] (Example 2) In the electric compressor of Example 2, the motor device 5 has a collar 61 shown in FIGS. 6 and 7 instead of the collar 5c.

[0077] The collar 61 is made of metal. As shown in FIG. 6, the collar 61 has a main body portion 61a and a protruding portion 61b. Further, a fixing hole 61c is formed in the collar 61, and the fixing hole 61c penetrates the collar 61 in the direction of the drive shaft center O. Thereby, the collar 61 has an annular shape.

[0078] The main body portion 61a has a front end face 611 facing forward and a rear end face 612 facing rearward, and has the same shape as the collar 5c in the electric compressor of Example 1. A first balance weight 63 is integrally formed on the main body portion 61a. The first balance weight 63 is also made of metal like the collar 61, and is integrally formed at a location on the outer circumference of the main body portion 61a rather than the fixing hole 61c. The first balance weight 63 is thicker than the main body portion 61a and is formed in a substantially arc shape protruding rearward. Note that the shape and thickness of the first balance weight 63 can be designed as appropriate.

[0079] The protruding portion 61b is integral with the main body portion 61a and protrudes annularly forward from the front end face 611. An adjustment portion 65 is provided on the protruding portion 61b. The adjustment portion 65 consists of four protrusions 650. Each protrusion 650 is made of metal like the collar 61 and is integrally formed on the protruding portion 61b. Each protrusion 650 has the same shape and is arranged at equal intervals in the circumferential direction of the drive shaft 3 on the outer peripheral side of the fixing hole 61c. Note that the number of protrusions 650 can be designed as appropriate.

[0080] Each protrusion 650 is formed in a rectangular plate shape and has a base end portion 650a and a tip end portion 650b. The base end portion 650a is connected to the protruding portion 61b. And the base end portion 650a protrudes forward from the protruding portion 61b and curves toward the outside of the fixing hole 61c. The tip end portion 650b is connected to the front end of the base end portion 650a and is integral with the base end portion 650a. The tip end portion 650b protrudes forward and curves more toward the outside of the fixing hole 61c than the base end portion 650a. Thus, since the base end portion 650a and the tip end portion 650b are plate-shaped, the rigidity of each protrusion 650, that is, the adjustment portion 65, is lower than the rigidity of the collar 61. Other configurations in the electric compressor of Example 2 are the same as those in the electric compressor of Example 1, and the same reference numerals are given to the same configurations and detailed descriptions of the configurations are omitted.

[0081] As shown in FIG. 7, in this electric compressor, with the rotor 5b fixed to the drive shaft main body 3a, the collar 61 is moved forward to the drive shaft main body 3a while being press-fitted into the drive shaft main body 3a from the rear end of the drive shaft 3. Thereby, the tip end portion 650b of each protrusion 650 abuts on the first end plate 53 outside the first communication hole 53a. In this way, the collar 61 is attached to the drive shaft main body 3a while clamping the rotor 5b in the direction of the drive shaft center O between the seating surface 301 of the flange portion 3b. At this time, the first balance weight 63 is also attached to the drive shaft main body 3a integrally with the collar 61. Also, each protrusion 650, that is, the adjustment portion 65, is disposed between the protruding portion 61b of the collar 61 and the rotor main body 51.

[0082] Then, by press-fitting the collar 61 further forward in this state, in this electric compressor, each projection 650 deforms in the direction of the drive shaft center O between the protruding portion 61b and the first end plate 53. Thus, also in this electric compressor, the position of the collar 61 in the direction of the drive shaft center O with respect to the drive shaft main body 3a can be adjusted by the deformation of each projection 650, that is, the adjustment portion 65. As a result, also in this electric compressor, it is possible to attach the collar 61 and the first balance weight 63 to the drive shaft main body 3a in a state where the rear ends of the first balance weights 63 are substantially aligned with the reference point P1 of the drive shaft main body 3a. Other operations in this electric compressor are the same as those in the electric compressor of the first embodiment.

[0083] (Embodiment 3) As shown in FIG. 8, in the electric compressor of Embodiment 3, an adjustment portion 67 is provided for the protruding portion 61b of the collar 61. The adjustment portion 67 is composed of four projections 670. Each projection 670 is also made of metal and is integrally formed with the protruding portion 61b. Each projection 670 has the same shape and is arranged at equal intervals in the circumferential direction of the drive shaft 3 on the outer peripheral side of the fixing hole 61c. Note that the number of the projections 670 can be designed as appropriate.

[0084] Each projection 670 is formed in a rectangular plate shape and has a base end portion 670a and a tip end portion 670b. The base end portion 670a is connected to the protruding portion 61b. And the base end portion 670a protrudes forward from the protruding portion 61b and curves toward the outside of the fixing hole 61c. The tip end portion 670b is connected to the base end portion 670a and is integral with the base end portion 670a. The tip end portion 670b extends substantially linearly from the base end portion 670a toward the outside of the fixing hole 61c. Thus, since the base end portion 670a and the tip end portion 670b are plate-shaped, the rigidity of each projection 670 is also lower than the rigidity of the collar 61. Other configurations in the electric compressor of Embodiment 3 are the same as those in the electric compressor of Embodiment 2.

[0085] Although detailed illustrations are omitted, in this electric compressor, by press-fitting the collar 61 from the rear end of the drive shaft 3 into the drive shaft main body 3a and moving it forward to the front of the drive shaft main body 3a, the tip portions 670b of the respective protrusions 670 abut against the first end plate 53 outside the first communication hole 53a. By press-fitting the collar 61 further forward in this state, each protrusion 670, that is, the adjustment portion 67, deforms in the direction of the drive shaft center O between the protruding portion 61b and the first end plate 53. Thus, also in this electric compressor, it is possible to achieve the same operation as the electric compressor of the first embodiment.

[0086] (Embodiment 4) The electric compressor of Embodiment 4 has a collar 71 and a first balance weight 73 shown in FIG. 9 in the motor device 5. The collar 71 and the first balance weight 73 are made of metal. Here, the collar 71 and the first balance weight 73 are formed separately.

[0087] The collar 71 is formed in a plate shape with a larger diameter than the drive shaft main body 3a. Also, at the center of the collar 71, a first fixing hole 71a penetrating the collar 71 in the direction of the drive shaft center O is formed. Thereby, the collar 71 has an annular shape with a larger diameter than the drive shaft main body 3a.

[0088] The first balance weight 73 is composed of a base portion 73a and an extension portion 73b. The base portion 73a is formed with a larger diameter and greater thickness than the collar 71. A second fixing hole 73c is formed in the base portion 73a. The second fixing hole 73c has the same diameter as the first fixing hole 71a and penetrates the base portion 73a in the direction of the drive shaft center O.

[0089] The extension portion 73b is integrally formed with the base portion 73a. The extension portion 73b is disposed at a location on the outer circumference of the base portion 73a rather than the second fixing hole 73c, and is formed in a shape protruding substantially in an arc shape rearward from the base portion 73a. Thereby, in the first balance weight 73, the location where the extension portion 73b is formed is thicker than the location of only the base portion 73a. Note that the shapes and thicknesses of the base portion 73a and the extension portion 73b can be designed as appropriate.

[0090] The first balance weight 73 is disposed behind the collar 71. The first balance weight 73 fixes the base 73a to the rear portion of the collar 71 while aligning the second fixing hole 73c with respect to the first fixing hole 71a in the direction of the drive axis O. In this way, the collar 71 and the first balance weight 73 are integrated while being positioned in a state where the first fixing hole 71a and the second fixing hole 73c communicate with each other in the direction of the drive axis O.

[0091] Also, an adjustment portion 75 is integrally provided on the front surface of the collar 71. The adjustment portion 75 is composed of four protrusions 750. Each protrusion 750 is made of metal like the collar 71. Each protrusion 750 has the same shape and is arranged at equal intervals in the circumferential direction of the drive shaft 3 on the outer peripheral side of the first fixing hole 71a. Each protrusion 750 is formed in a plate shape and has a base end portion 750a and a tip end portion 750b. The base end portion 750a and the tip end portion 750b have the same configuration as the base end portion 650a and the tip end portion 650b in the electric compressor of Embodiment 3. Other configurations in this electric compressor are the same as those in the electric compressor of Embodiment 1.

[0092] Although detailed illustrations are omitted, in this electric compressor, by press-fitting the drive shaft body 3a from the rear end of the drive shaft 3 into the first fixing hole 71a and the second fixing hole 73c, the collar 71 and the first balance weight 73 are integrally attached to the drive shaft body 3a. Also, in this electric compressor, the tip end portion 750b of each protrusion 750 abuts on the first end plate 53 outside the first communication hole 53a. And by moving the collar 71 and the first balance weight 73 forward of the drive shaft body 3a in this state, each protrusion 750, that is, the adjustment portion 75, deforms in the direction of the drive axis O between the collar 71 and the first end plate 53. In this way, this electric compressor can also exhibit the same operation as the electric compressor of Embodiment 1.

[0093] In addition, in this electric compressor, since the collar 71 and the first balance weight 73 are formed separately, the degree of freedom in the design of the collar 71 and the first balance weight 73 is high. Further, in this electric compressor, since the first balance weight 73 has its base 73a fixed to the rear portion of the collar 71 and the collar 71 is attached to the drive shaft main body 3a, the first balance weight 73 can also be attached to the drive shaft main body 3a integrally with the collar 71.

[0094] (Example 5) As shown in FIG. 10, in the electric compressor of Example 5, the drive shaft 3 is composed of a drive shaft main body 3a and a flange portion 3c. Further, in this electric compressor, the motor device 5 has a collar 81 and a second balance weight 85. Also, in Example 5, the front of the electric compressor corresponds to "one side in the drive shaft axis direction" in the present invention, and the rear of the electric compressor corresponds to "the other side in the drive shaft axis direction" in the present invention.

[0095] The flange portion 3c is integrally formed with the drive shaft main body 3a and is disposed at a location closer to the rear in the drive shaft main body 3a. Similar to the above-described flange portion 3b, the flange portion 3c is formed to have a larger diameter than the drive shaft main body 3a and protrudes in a disc shape toward the outside in the radial direction of the drive shaft 3 from the drive shaft main body 3a.

[0096] The flange portion 3c has a seating surface 303. The seating surface 303 faces the front of the drive shaft 3 and constitutes the front surface of the flange portion 3c. Further, the flange portion 3c has a rear surface 304 located on the opposite side of the seating surface 303.

[0097] The collar 81 is made of metal. As shown in FIG. 11, the collar 81 is formed in a cylindrical shape extending in the direction of the drive axis O, and a fixing hole 81a is formed at the center. Further, an adjustment portion 87 is integrally provided at the rear end of the collar 81. The adjustment portion 87 is composed of four protrusions 870. Each protrusion 870 is made of metal like the collar 81. Each protrusion 870 has the same shape and is arranged at equal intervals in the circumferential direction of the drive shaft 3 on the outer peripheral side of the fixing hole 81a. Each protrusion 870 is composed of a base end portion 870a and a tip end portion 870b, respectively. The base end portion 870a and the tip end portion 870b have the same configuration as the base end portion 65a and the tip end portion 65b in the electric compressor of Embodiment 3, respectively. Note that the number of the protrusions 870 can be designed appropriately.

[0098] In addition, a first balance weight 83 is integrally formed on the collar 81. The first balance weight 83 is made of metal and is arranged at a position in front of the adjustment portion 87 in the collar 81. The first balance weight 83 is formed in a fan-shaped plate shape and has a larger diameter than the collar 81. Thereby, the first balance weight 83 protrudes outward in the radial direction from the collar 81. Further, as shown in FIG. 10, the front end of the first balance weight 83 is flush with the front end of the collar 81. Note that the shape and the plate thickness of the first balance weight 83 can be designed appropriately.

[0099] The second balance weight 85 is made of metal and is formed to have a larger diameter than the drive shaft 3. A fixing hole 85a is formed in the second balance weight 85. Further, an extension portion 85b is formed in the second balance weight 85. The extension portion 85b is arranged at a position outside the fixing hole 85a and protrudes rearward. Note that the shape of the second balance weight 85 can also be designed appropriately. Other configurations in this electric compressor are the same as those in the electric compressor of Embodiment 1.

[0100] In this electric compressor, the rotor 5b is inserted into the drive shaft main body 3a from the front end of the drive shaft 3. At this time, in this electric compressor, unlike the electric compressor of the first embodiment, the rotor 5b is inserted into the drive shaft main body 3a with the front - rear direction of the rotor 5b reversed. That is, in this electric compressor, the first end plate 53 is located in front of the rotor main body 51, and the second end plate 54 is located behind the rotor main body 51.

[0101] Then, while inserting the rotor 5b into the drive shaft main body 3a and moving it toward the rear of the drive shaft main body 3a, the flange portion 3c of the drive shaft 3 enters the third communication hole 54a of the second end plate 54. As a result, the seating surface 303 of the flange portion 3c abuts against the rotor main body 51 from the rear within the third communication hole 54a. As a result, in this electric compressor, the position of the rotor 5b in the direction of the drive shaft center O with respect to the drive shaft 3 is defined. Also, in this electric compressor, the rotor 5b is fixed to the drive shaft main body 3a by fitting a key (not shown) into the mounting hole 51a.

[0102] Also, in this electric compressor, the second balance weight 85 is press - fitted into the drive shaft main body 3a from the rear end of the drive shaft 3. As a result, the second balance weight 85 is attached to the drive shaft main body 3a at a location behind the flange portion 3c.

[0103] Furthermore, in this electric compressor, with the rotor 5b fixed to the drive shaft main body 3a, the collar 81 is inserted into the drive shaft main body 3a from the front end of the drive shaft 3 and moved toward the rear of the drive shaft main body 3a while being press - fitted. As a result, the tip portion 870b of each projection 870 abuts against the first end plate 53 outside the first communication hole 53a. In this way, the collar 81 is attached to the drive shaft main body 3a while clamping the rotor 5b in the direction of the drive shaft center O between the seating surface 303 of the flange portion 3c.

[0104] Here, since the first balance weight 83 is integrally formed with the color 81, in this electric compressor, the first balance weight 83 is also attached to the drive shaft main body 3a integrally with the color 81. At this time, the attachment of the color 81 to the drive shaft main body 3a is adjusted so that the first balance weight 83 is displaced in the circumferential direction of the drive shaft 3 with respect to the extending portion 85b of the second balance weight 85.

[0105] And in this electric compressor, with each projection 870 in contact with the first end plate 53, the color 81 is brought closer to the rotor 5b, so that each projection 870, that is, the adjustment portion 87, is deformed in the direction of the drive shaft center O between the color 81 and the first end plate 53. Thus, also in this electric compressor, due to the deformation of the adjustment portion 87, the attachment position of the color 81 with respect to the drive shaft main body 3a, and thus the attachment position of the first balance weight 83 with respect to the drive shaft main body 3a, can be adjusted.

[0106] Therefore, in this electric compressor, for example, if it was previously designed to attach the color 81 and the first balance weight 83 to the drive shaft main body 3a so that the front ends of the first balance weights 83 align with the reference point P2 of the drive shaft main body 3a, it is possible to attach the color 81 and the first balance weight 83 to the drive shaft main body 3a with the front ends of the first balance weights 83 substantially aligned with the reference point P2. Other operations in this electric compressor are the same as those in the electric compressor of the first embodiment.

[0107] (Embodiment 6) In the electric compressor of Embodiment 6, instead of the first end plate 53, the rotor 5b has the first end plate 91 shown in FIGS. 12 and 13. Also, similar to Embodiment 5, in Embodiment 6 as well, the front of the electric compressor corresponds to "one side in the drive shaft center direction" in the present invention, and the rear of the electric compressor corresponds to "the other side in the drive shaft center direction" in the present invention.

[0108] The first end plate 91 is made of metal. As shown in Fig. 13, the first end plate 91 is composed of a plate body 93 and eight adjusting parts 95. The plate body 93 is formed in a disc shape. Also, the plate body 93 is formed with a greater thickness in the direction of the drive axis O than each electromagnetic steel plate 510. In the plate body 93, a first through hole 93a, a plurality of second through holes 93b, and a plurality of second pin holes 93c are formed. These first through hole 93a, each second through hole 93b, and each second pin hole 93c have the same configuration as the first through hole 53a, each second through hole 53b, and each second pin hole 53c in the electric compressor of the first embodiment respectively.

[0109] Each adjusting part 95 is integrally formed on the plate body 93 and extends in a plate shape within the first through hole 93a. Each adjusting part 95 is arranged at equal intervals in the circumferential direction of the first through hole 93a. As shown in Fig. 12, the plate thickness of each adjusting part 95 is formed thinner than the plate thickness of the plate body 93. Note that the shape and number of the adjusting parts 95 can be designed as appropriate.

[0110] In this electric compressor, with the first end plate 91 positioned in front of the rotor body 51 and the second end plate 54 positioned behind the rotor body 51, the rotor body 51, the first end plate 91, and the second end plate 54 are fastened and integrated in the direction of the drive axis O. Thus, in this electric compressor, the rotor body 51 is clamped in the direction of the drive axis O by the first end plate 91 and the second end plate 54.

[0111] Also, as shown in Figs. 12 and 14, in this electric compressor, no adjusting part 87 is formed on the collar 81. Other configurations in this electric compressor are the same as those in the electric compressor of the fifth embodiment.

[0112] Similar to the electric compressor of Example 5, in this electric compressor as well, the rotor 5b is inserted into the drive shaft main body 3a from the front end of the drive shaft 3. Then, with the seating surface 303 of the flange portion 3c abutted against the rotor main body 51 from the rear within the third communication hole 54a of the second end plate 54, the rotor 5b is fixed to the drive shaft main body 3a. Further, the second balance weight 85 is press-fitted into the drive shaft main body 3a from the rear end of the drive shaft 3, and the second balance weight 85 is attached to the drive shaft main body 3a at a location behind the flange portion 3c.

[0113] Furthermore, in this electric compressor, with the rotor 5b fixed to the drive shaft main body 3a, the collar 81 is press-fitted into the drive shaft main body 3a from the front end of the drive shaft 3 and moved rearward of the drive shaft main body 3a. As a result, each adjustment portion 95 of the first end plate 91 abuts against the rear end of the collar 81. And in this state, by bringing the collar 81 closer to the rotor 5b, each adjustment portion 95 is pressed by the collar 81. Thereby, each adjustment portion 95 deforms in the direction of the drive shaft center O between the collar 81 and the rotor main body 51. For this reason, a part of the collar 81 can enter into the first communication hole 93a. Thus, also in this electric compressor, by the deformation of each adjustment portion 95, the position of the collar 81, and thus the position of the first balance weight 83 in the direction of the drive shaft center O, can be adjusted. Other operations in this electric compressor are the same as those in the electric compressor of Example 1.

[0114] As described above, the present invention has been described with reference to Examples 1 to 6. However, it goes without saying that the present invention is not limited to the above Examples 1 to 6, and can be appropriately modified and applied without departing from the gist thereof.

[0115] For example, in the electric compressor of Example 1, the adjustment portion 59 is integrally formed with the collar 5c. However, it is not limited to this, and a configuration in which the adjustment portion 59 formed separately from the collar 5c is fixed to the collar 5c may be adopted. Also, in this case, the adjustment portion 59 may be formed of a material other than metal. The same applies to the electric compressors of Examples 2 to 5.

[0116] Also, in the electric compressor of Example 5, the collar 81 and the first balance weight 83 may be formed separately, and the first balance weight 83 may be fixed to the collar 81. The same applies to the electric compressor of Example 6.

[0117] Also, regarding the adjustment part 87 in the electric compressor of Example 5, it may have the same shape as the adjustment part 65 in the electric compressor of Example 2.

[0118] Also, in the electric compressor of Example 1, a seating surface 301 is provided for the flange part 3b. However, it is not limited to this, and a first diameter part and a second diameter part having a larger diameter than the first diameter part may be provided for the drive shaft main body 3a, and the step formed between the first diameter part and the second diameter part may be used as the seating surface. The same applies to the electric compressors of Examples 2 to 6.

[0119] Also, in the electric compressors of Examples 1 to 6, the refrigerant gas is used as the "fluid" in the present invention. However, it is not limited to this, and air, oxygen, etc. may be used as the "fluid" in the present invention.

[0120] Also, in the electric compressors of Examples 1 to 6, a scroll type compression mechanism is adopted as the compression mechanism 7. However, it is not limited to this, and by adopting a vane type compression mechanism, a centrifugal type compression mechanism, etc. as the compression mechanism 7, the electric compressors of Examples 1 to 6 may be used as vane type electric compressors or centrifugal type electric compressors.

[0121] Also, this specification includes the following inventions. (Appendix 1) A housing, A drive shaft provided in the housing and rotatable around the drive shaft center, A motor device provided in the housing for rotating the drive shaft, An electric compressor provided in the housing and including a compression mechanism that is driven by the drive shaft and compresses a fluid. The motor device includes a stator fixed within the housing, a rotor attached to the drive shaft, and a collar attached to the drive shaft and contacting the rotor on one side in the drive shaft axis direction. The drive shaft contacts the rotor on the other side in the drive shaft axis direction and has a seating surface that defines the position of the rotor in the drive shaft axis direction with respect to the drive shaft. The rotor includes a rotor body composed of a plurality of electromagnetic steel sheets laminated in the drive shaft axis direction, a first end plate disposed on one side of the rotor body in the drive shaft axis direction, and a second end plate disposed on the other side of the rotor body in the drive shaft axis direction and clamping the rotor body in the drive shaft axis direction between the second end plate and the first end plate. The collar is provided with a balance weight. An electric compressor, characterized in that an adjusting portion capable of adjusting the position of the collar in the drive shaft axis direction with respect to the drive shaft while deforming in the drive shaft axis direction is disposed between the collar and the rotor body. (Appendix 2) The balance weight is integrally formed with the collar, and the electric compressor according to Appendix 1 is provided. (Appendix 3) The adjusting portion has a plurality of protrusions provided on the collar and protruding in the drive shaft axis direction from the collar toward the rotor body. Each of the protrusions is disposed in the circumferential direction of the drive shaft with respect to the collar, and the electric compressor according to Appendix 1 or 2 is provided. (Appendix 4) (Appendix 5) Each of the protrusions penetrates the protrusion in a direction intersecting the drive shaft axis direction. Each of the protrusions has a base end portion that protrudes toward the rotor body while connecting to the collar, and a tip end portion that connects to the base end portion and protrudes toward the outside in the radial direction of the collar from the base end portion, and the electric compressor according to Appendix 3 is provided. (Appendix 6) A plurality of the adjusting portions are provided on the first end plate, and the electric compressor according to Appendix 1 or 2 is provided. (Appendix 7) The balance weight includes a first balance weight provided on the collar, and a second balance weight provided on the second end plate or the drive shaft and arranged on the opposite side in the direction of the drive shaft axis with the rotor main body interposed therebetween with respect to the first balance weight. The electric compressor according to any one of Appendices 1 to 6.

Industrial Applicability

[0122] The present invention can be used for vehicle air conditioners and the like.

Explanation of Symbols

[0123] 1... Housing 3... Drive shaft 5... Motor device 5a... Stator 5b... Rotor 5c, 61, 71, 81... Collar 5d, 63, 73, 83... First balance weight (balance weight) 7... Compression mechanism 51... Rotor main body 53, 91... First end plate 54... Second end plate 55, 85... Second balance weight (balance weight) 59, 65, 67, 75, 87, 95... Adjusting part 59a... Through hole 301, 303... Seating surface 510... Electromagnetic steel sheet 590, 650, 670, 750, 870... Protrusion 650a, 670a, 750a, 870a... Base end part 650b, 670b, 750b, 870b... Tip part O... Drive shaft axis

Claims

1. A housing, a drive shaft provided within the housing and rotatable about a drive axis, a motor device provided within the housing for rotating the drive shaft, an electric compressor provided within the housing and including a compression mechanism that is driven by the drive shaft to compress a fluid, wherein the motor device has a stator fixed within the housing, a rotor attached to the drive shaft, and a collar attached to the drive shaft and contacting the rotor on one side in the drive axis direction, the drive shaft contacts the rotor on the other side in the drive axis direction and has a seating surface that defines the position of the rotor in the drive axis direction with respect to the drive shaft, the rotor includes a rotor body formed of a plurality of electromagnetic steel sheets laminated in the drive axis direction, a first end plate disposed on one side of the rotor body in the drive axis direction, and a second end plate disposed on the other side of the rotor body in the drive axis direction and sandwiching the rotor body in the drive axis direction between the first end plate and the second end plate, the collar is provided with a balance weight, and an adjustment portion that is deformable in the drive axis direction and can adjust the position of the collar in the drive axis direction with respect to the drive shaft is disposed between the collar and the rotor body. The electric compressor is characterized by this.

2. The electric compressor according to claim 1, wherein the balance weight is integrally formed with the collar.

3. The adjustment portion has a plurality of protrusions provided on the collar and protruding in the drive axis direction from the collar toward the rotor body, and each of the protrusions is disposed in the circumferential direction of the drive shaft with respect to the collar. The electric compressor according to claim 1 or 2.

4. The electric compressor according to claim 3, wherein each of the protrusions is formed with a through hole penetrating the protrusion in a direction intersecting the drive axis direction.

5. Each of the protrusions has a base end portion that connects to the collar and protrudes toward the rotor body, and a tip end portion that connects to the base end portion and protrudes toward the outside in the radial direction of the collar from the base end portion. The electric compressor according to claim 3.

6. The electric compressor according to claim 1 or 2, wherein a plurality of the adjustment portions are provided on the first end plate.

7. The balance weight includes a first balance weight provided on the collar, and The electric compressor according to claim 1 or 2, further comprising a second balance weight provided on the second end plate or the drive shaft and arranged on the opposite side in the drive shaft center direction with the rotor body interposed therebetween with respect to the first balance weight.

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