JP2020018064A - Motor - Google Patents

Abstract

To provide a motor that can be manufactured by diverting a case and a flange from a different motor.SOLUTION: A motor 1 includes: a rotor 2 having a rotary shaft 11 and a rotor core 12 fixed to the rotary shaft 11; a stator 3 opposed to the rotor core 12 with a gap therebetween; a case 4 that has a first opening 32 in an axial direction of the rotary shaft 11 and houses the rotor core 12 and the stator 3; a first flange 5 disposed while opposing to the first opening 32 in the axial direction of the rotary shaft 11; and an adapter 7 disposed between the case 4 and the first flange 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric motor.

  Patent Literature 1 discloses an electric motor (rotary electric motor) having a stator and a rotor. The electric motor includes a cylindrical case (frame) that houses the rotor and the stator, and a flange (bracket) that closes an opening of the case. In the motor of Patent Literature 1, the output of the motor can be changed by changing the number of motor units including the stator, the rotor, and the case arranged in the axial direction of the rotating shaft (shaft), and the motor is designed according to specifications. be able to. This eliminates the need to design and manufacture the motor unit according to the specifications, so that the design cost and the manufacturing cost can be reduced.

International Publication No. WO 2017/187574

In the electric motor disclosed in Patent Literature 1, since the motor unit and the flange are fixed by bolts (fixing members), it is necessary to prepare a specific flange for a specific motor unit.
By the way, electric motors used in work vehicles typified by hydraulic excavators have a smaller number of productions than home electric appliances or automobiles, and therefore, there are cases where high-mix low-volume production is required. Therefore, it is desirable to reduce the manufacturing cost by diverting parts (for example, a case or a flange) constituting the motor from a plurality of types of existing motors. However, the case and the flange are diverted from existing motors different from each other. In such a case, the structure for attaching the case and the flange usually differs between the case and the flange. For this reason, it is difficult to divert the case and the flange from different motors.

  The present invention has been made in view of such a problem, and has as its object to provide an electric motor that can be manufactured by diverting a case and a flange from electric motors different from each other.

  An electric motor according to one aspect of the present invention includes a rotating shaft, a rotor having a rotor core fixed to the rotating shaft, a stator opposed to the rotor core with a gap therebetween, and an axial direction of the rotating shaft. A case having an opening in the rotor core and the stator, a flange disposed opposite to the opening in the axial direction, and an adapter disposed between the case and the flange. .

  According to the present invention, the case and the flange having different mounting structures can be connected by the adapter. Thus, it is possible to manufacture an electric motor in which the case and the flange are diverted from existing electric motors different from each other.

It is a sectional view showing the electric motor concerning one embodiment of the present invention. FIG. 2 is a front view of the electric motor of FIG. 1 as viewed from a first flange side in an axial direction of a rotating shaft. FIG. 2 is an exploded cross-sectional view showing a state where a first flange is removed from an adapter in the electric motor of FIG. 1. FIG. 4 is a front view of the electric motor of FIG. 3 as viewed from an adapter side in an axial direction of a rotation shaft. It is the front view which looked at the electric motor concerning other embodiments of the present invention from the adapter side in the direction of an axis of a rotating shaft.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
<Electric motor>
As shown in FIG. 1, the electric motor 1 includes a rotor 2, a stator 3, a case 4, flanges 5 and 6, an adapter 7, a first fixing member 8, and a second fixing member 9. Further, the electric motor 1 of the present embodiment is configured to supply cooling oil to the coils 22 constituting the stator 3 to cool the coils 22. That is, the supply passage 10 for supplying the cooling oil to the coil 22 is formed in the electric motor 1 of the present embodiment.

<Rotor>
The rotor 2 includes a rotating shaft 11 and a rotor core 12. Further, the rotor 2 includes a pair of end plates 13 and 14.
The rotating shaft 11 is a rod-shaped member centered on the axis O. The rotation shaft 11 is provided rotatably around the axis O. A rotation sensor 15 (resolver) that measures the rotation speed of the rotation shaft 11 is attached to the first end 111 of the rotation shaft 11 in the direction of the axis O.

The rotor core 12 is formed in a cylindrical shape about the axis O. The rotor core 12 is fixed to an outer peripheral surface of the rotating shaft 11. Specifically, the inner peripheral surface of the rotor core 12 is fitted to the outer peripheral surface of the rotating shaft 11.
The pair of end plates 13 and 14 are each formed in an annular plate shape centered on the axis O. The pair of end plates 13 and 14 are overlapped and fixed to both ends of the rotor core 12 in the direction of the axis O.

<Supply channel in rotor>
A central hole 10a, a radial hole 10b, and an axial flow path 10c that constitute the supply flow path 10 are formed in the rotation shaft 11 of the rotor 2. Although not shown, a flow path constituting the supply flow path 10 is also formed in the rotor core 12 and the end plates 13 and 14 of the rotor 2.
The center hole 10a extends in the axis O direction from the first end 111 of the rotating shaft 11 in the axis O direction. The extension end of the center hole 10 a is located radially inside the rotor core 12. In FIG. 1, the tip of the center hole 10a is located in the middle of the rotor core 12 in the direction of the axis O, but is not limited to this.

The radial hole 10 b extends in the radial direction of the rotating shaft 11 from the tip of the center hole 10 a to the outer peripheral surface of the rotating shaft 11. A plurality of radial holes 10b are arranged at intervals in the circumferential direction of the rotating shaft 11.
The axial flow path 10 c is formed in a groove shape extending in the direction of the axis O in a region of the outer peripheral surface of the rotating shaft 11 covered by the rotor core 12. A plurality of axial flow paths 10c are arranged at intervals in the circumferential direction of the rotating shaft 11. Each axial flow path 10c is connected to each radial hole 10b.

<Stator>
The stator 3 faces the rotor core 12 with a gap therebetween. The stator 3 of the present embodiment is disposed to face the rotating shaft 11 in the radial direction with a gap between the stator 3 and the rotor core 12. That is, the electric motor 1 of the present embodiment constitutes a radial gap type electric motor. The stator 3 includes a stator core 21 and a coil 22.
The stator core 21 has a cylindrical yoke 23 centered on the axis O, and a plurality of teeth 24 protruding from the inner periphery of the yoke 23. The plurality of teeth 24 are arranged at intervals in the circumferential direction of the yoke 23. Stator core 21 is arranged such that teeth 24 face rotor core 12 with a gap therebetween. The stator core 21 may be configured by, for example, laminating a plurality of electromagnetic steel sheets in the direction of the axis O, or may be formed by powder molding.
A plurality of coils 22 are provided so as to correspond to the respective teeth 24 of the stator core 21, and are wound around the respective teeth 24. A temperature sensor 25 for measuring the temperature of the coil 22 is attached to the coil 22.

<Case>
The case 4 has openings 32 and 33 in the direction of the axis O (the axial direction of the rotating shaft 11). In the present embodiment, the case 4 is formed in a cylindrical shape extending in the direction of the axis O. That is, the case 4 has the first opening 32 and the second opening 33 at both ends in the direction of the axis O. The case 4 houses the rotor core 12 and the stator 3. That is, the case 4 has the inner space 31 that houses the rotor core 12 and the stator 3. A pair of end plates 13 and 14 are also housed in the inner space 31 of the case 4. The rotating shaft 11 is passed through the inner space 31 of the case 4. Both ends (first end 111, second end 112) of the rotating shaft 11 in the direction of the axis O project outward from the first opening 32 and the second opening 33 at both ends of the case 4.
Stator 3 is held on the inner periphery of case 4. The stator 3 may be fixed to the case 4 by fitting the stator core 21 to the inner periphery of the case 4 by, for example, press fitting. Further, the stator 3 may be fixed to the case 4 by using a fixing member such as a bolt.

  A first female screw hole 35 is formed in the first end face 34 of the case 4 located on the first opening 32 side of the case 4 in the direction of the axis O. The first end surface 34 of the case 4 is a surface formed in an annular shape when viewed from the axis O direction. As shown in FIGS. 2 and 4, a plurality of first female screw holes 35 are arranged at intervals in the circumferential direction of the case 4.

  As shown in FIG. 1, the case 4 is formed with a through hole 36 that penetrates from the inner peripheral surface to the outer peripheral surface and connects the inner space 31 of the case 4 to the space outside the case 4. The through hole 36 is formed in a part of the case 4 in the circumferential direction.

<Flange>
The flanges 5 and 6 are arranged to face the first opening 32 and the second opening 33 of the case 4 in the direction of the axis O. The flanges 5 and 6 are attached to the case 4 so as to cover the first opening 32 and the second opening 33 of the case 4. The flanges 5 and 6 of the present embodiment include a first flange 5 for covering the first opening 32 of the case 4 and a second flange 6 for covering the second opening 33 of the case 4.
Bearings 40 and 60 that rotatably support the rotating shaft 11 are provided between the rotating shaft 11 and the flanges 5 and 6. Specifically, a shaft insertion for inserting each end (first end 111, second end 112) of the rotating shaft 11 protruding outward from each opening 32, 33 of the case 4 into each flange 5, 6. Holes 41 and 61 are formed. The bearings 40 and 60 are provided between the outer circumference of the rotating shaft 11 and the inner circumferences of the shaft insertion holes 41 and 61 of the flanges 5 and 6.

<Bearing>
The bearings 40 and 60 of the present embodiment are grease-enclosed bearings. Note that the bearings 40 and 60 may be oil-lubricated bearings or the like that lubricate with lubricating oil as a fluid.
In the following description, the bearing 40 provided between the rotating shaft 11 and the first flange 5 is referred to as a first bearing 40, and the bearing 60 provided between the rotating shaft 11 and the second flange 6 is referred to as a second bearing 60. Call.

<First flange>
As shown in FIGS. 1 to 3, a first screw insertion hole 42 is formed in the first flange 5. The first screw insertion hole 42 passes through the first flange 5 in the direction of the axis O. The plurality of first screw insertion holes 42 are arranged in a circumferential direction about the axis O. The first screw insertion hole 42 is arranged at a position different from the first female screw hole 35 of the case 4 when viewed from the axis O direction. The difference between the positions of the first screw insertion hole 42 and the first female screw hole 35 is due to the case 4 and the first flange 5 being diverted from different types of existing electric motors.
The first screw insertion hole 42 may be displaced from the first female screw hole 35, for example, only in the radial direction or only in the circumferential direction. In the present embodiment, the first screw insertion hole 42 is shifted from the first female screw hole 35 in the radial direction and the circumferential direction. In addition, the first screw insertion hole 42 is shifted radially outward with respect to the first female screw hole 35 of the case 4. The number of the first screw insertion holes 42 may be the same as the number of the first female screw holes 35, for example, but is different from the number of the first female screw holes 35 in the present embodiment.

As shown in FIGS. 1 and 3, the first flange 5 of the present embodiment is formed in a box shape having an accommodation space 43. Note that the first flange 5 may be formed in a simple plate shape. The housing space 43 is provided with a wiring portion 44 that is electrically connected to electric components such as the coil 22, the temperature sensor 25, and the rotation sensor 15. Wirings (not shown) extending from the above-described various electrical components are connected to the wiring portion 44.
Further, the first flange 5 of the present embodiment is formed with a flange-side flow path 10 d constituting the supply flow path 10.

Specifically, the first flange 5 of the present embodiment includes a flange main body 45, a lid 46, and a tubular portion 47.
The flange body 45 is formed so as to cover the first opening 32 of the case 4. The shaft insertion hole 41 and the first screw insertion hole 42 of the first flange 5 are formed in the flange main body 45. In addition, a recess 48 is formed in the flange body 45. The concave portion 48 is formed so as to be depressed from the surface of the flange body 45 facing the opposite side to the case 4 in the direction of the axis O. The shaft insertion hole 41 described above is opened on the bottom surface of the concave portion 48. That is, the shaft insertion hole 41 passes through the flange main body 45 in the direction of the axis O.

The lid 46 is attached to the flange body 45 so as to close the opening of the recess 48. That is, the lid part 46 constitutes the accommodation space 43 of the first flange 5 together with the concave part 48 of the flange main body 45. The lid 46 is formed with a flow path forming part 10d1 that forms the flange side flow path 10d. One end of the flow path forming portion 10d1 in the longitudinal direction is open to face the shaft insertion hole 41 of the flange body 45.
The cylindrical portion 47 is disposed in the concave portion 48 of the flange main body 45 so as to connect the flow path forming portion 10d1 of the lid portion 46 and the center hole 10a of the rotating shaft 11. The cylindrical portion 47 forms a flange side flow passage 10d together with the flow passage forming portion 10d1 of the lid portion 46.

<Cooling oil distribution>
The cooling oil flows from the outside of the electric motor 1 through the flange side flow path 10d formed in the first flange 5, the center hole 10a formed in the rotating shaft 11, the radial hole 10b, and the axial flow path 10c in this order. After flowing through a flow path (not shown) formed in the rotor core 12 and the end plates 13 and 14, it is supplied to the coil 22 arranged in the inner space 31. Thereafter, the cooling oil is discharged to the outside of the case 4 through the through holes 36 of the case 4. The cooling oil discharged to the outside of the case 4 may be supplied again to the flange-side flow path 10d of the first flange 5 by, for example, the cooling oil circulation unit 90. The cooling oil circulating section 90 includes a cooling oil pump 91 for pumping the cooling oil from the through hole 36 of the case 4 toward the flange side flow path 10d, a cooling section 92 for cooling the cooling oil, and dust and dirt from the cooling oil. A strainer 93 or the like for removal may be provided.

  The first end 111 of the rotating shaft 11 is inserted into the cylindrical portion 47 of the first flange 5 described above. An oil seal 49 is provided between the cylindrical portion 47 and the first end 111 of the rotating shaft 11 to prevent the cooling oil from reaching the rotation sensor 15.

<Second flange>
As shown in FIG. 1, the second flange 6 of the present embodiment is formed in a simple plate shape. Note that the second flange 6 may be formed in any shape such as a box shape similar to the first flange 5. The shaft insertion hole 61 of the second flange 6 penetrates the second flange 6. The second end 112 of the rotating shaft 11 is inserted into the shaft insertion hole 61 of the second flange 6. An oil seal 62 is provided between the second flange 6 and the rotating shaft 11 in addition to the second bearing 60. The oil seal 62 is provided between the outer periphery of the rotating shaft 11 and the inner periphery of the shaft insertion hole 61 of the second flange 6. The oil seal 62 is located closer to the inner space 31 of the case 4 than the second bearing 60 in the direction of the axis O. Thereby, the cooling oil supplied to the inner space 31 can be prevented from reaching the second bearing 60.
The second flange 6 is fixed to the case 4 so as to close the second opening 33 of the case 4. The second flange 6 may be detachably fixed to the case 4 by a fixing member (not shown) such as a bolt.

<Adapter>
As shown in FIGS. 1 and 3, the adapter 7 is disposed between the case 4 and the first flange 5. The adapter 7 is detachably fixed to the case 4 and the first flange 5, respectively. The adapter 7 includes a main body 71 and a partition 72. The adapter 7 of the present embodiment is configured by integrally forming a main body 71 and a partition 72. In addition, the adapter 7 may be configured by separately forming the main body 71 and the partition 72 and combining the main body 71 and the partition 72.

  The main body 71 is formed in an annular shape about the axis O, and is sandwiched between the case 4 (the first end face 34) and the first flange 5. As shown in FIGS. 1, 3, and 4, the main body 71 has a second screw insertion hole 73 and a second female screw hole 74 formed therein. The second screw insertion hole 73 and the second female screw hole 74 each extend in the direction of the axis O. The second female screw hole 74 of the present embodiment does not penetrate the main body 71 and opens only on the surface (first end surface 75) of the adapter 7 facing the first flange 5 side in the axis O direction. The second screw insertion hole 73 and the second female screw hole 74 are arranged at different positions when viewed from the axis O direction. The second screw insertion hole 73 may penetrate the main body 71 in the axis O direction.

The plurality of second screw insertion holes 73 are arranged at intervals in the circumferential direction of the main body 71. The second screw insertion hole 73 is disposed at the same position as the first female screw hole 35 formed in the case 4 when viewed from the axis O direction. In a region where the second screw insertion hole 73 is opened in the first end surface 75 of the main body 71 facing the first flange 5 side, a concave portion 76 that is depressed from the first end surface 75 is formed. The recess 76 may be formed in a so-called counterbore shape.
Similarly to the second screw insertion hole 73, a plurality of second female screw holes 74 are arranged at intervals in the circumferential direction of the main body 71. 2 and 4, the second female screw hole 74 is disposed at the same position as the first screw insertion hole 42 formed in the first flange 5 when viewed from the axis O direction.

As shown in FIGS. 1 and 4, the partition wall portion 72 is integrally formed radially inward with respect to the main body portion 71. As shown in FIG. 1, the partition wall portion 72 includes an inner space 31 of the case 4 and a first bearing 40 provided between the rotating shaft 11 and the first flange 5, which is located outside the case 4. Outside space 77 is defined. The outer space 77 is located between the partition wall portion 72 and the first flange 5 (flange main body 45) in the direction of the axis O, and is a space where the first bearing 40 is exposed. The outer space 77 may be connected to, for example, a space outside the electric motor 1, but in the present embodiment, the outer space 77 is sealed with respect to the space outside the electric motor 1. In the outer space 77 of the present embodiment, the surface of the partition wall portion 72 facing the first flange 5 side is located farther from the first flange 5 than the first end surface 75 of the main body portion 71 contacting the first flange 5. It is formed with.
Thereby, the partition wall portion 72 is disposed between the inner space 31 of the case 4 and the first bearing 40 in the direction of the axis O. That is, the partition wall portion 72 covers the first bearing 40.

As shown in FIGS. 1, 3, and 4, the partition wall 72 has a shaft insertion hole 78 through which the rotating shaft 11 passes. The inner diameter of the shaft insertion hole 78 may be set so that the gap between the inner periphery of the shaft insertion hole 78 and the outer periphery of the rotary shaft 11 in the radial direction is reduced.
An oil seal 79 is provided between the inner periphery of the shaft insertion hole 78 and the outer periphery of the rotating shaft 11. That is, the gap between the inner periphery of the shaft insertion hole 78 and the outer periphery of the rotating shaft 11 is filled with the oil seal 79.

  As shown in FIG. 4, wiring holes 81 and 82 for passing wiring between the inner space 31 and the outer space 77 of the case 4 are formed in the partition wall portion 72. The wiring holes 81 and 82 penetrate the partition wall 72 in the axis O direction. The wiring holes 81 and 82 are located outside the shaft insertion hole 78 in the radial direction. It is more preferable that the wiring holes 81 and 82 be located outside the first bearing 40 in the radial direction. Further, it is more preferable that rubber holes 83 and 84 are provided in the wiring holes 81 and 82 so as to fill gaps between the wiring holes 81 and 82 and the wiring passing therethrough.

In the partition wall portion 72 of the present embodiment, two wiring holes 81 and 82 are formed. The wiring extending from the coil 22 (electric component) disposed in the inner space 31 of the case 4 passes through the first wiring hole 81. The wiring extending from the temperature sensor 25 (electric component) disposed in the inner space 31 of the case 4 passes through the second wiring hole 82. The wires of the coil 22 and the temperature sensor 25 pass through the wiring holes 81 and 82 and are connected to the wiring portion 44 of the first flange 5.
For example, the wiring holes 81 and 82 may not be formed in the partition wall portion 72. In this case, the wiring of the coil 22 and the temperature sensor 25 may pass through the side of the case 4, for example.

  As shown in FIGS. 1, 3, and 4, a communication hole 85 that connects the inner space 31 and the outer space 77 of the case 4 is formed in the partition wall portion 72. The communication hole 85 penetrates the partition wall portion 72 in the direction of the axis O, similarly to the wiring holes 81 and 82. The communication hole 85 is located outside the first bearing 40 in the radial direction of the partition wall portion 72.

<Fixing member>
As shown in FIGS. 1 to 4, the first fixing member 8 fixes the adapter 7 and the case 4. The second fixing member 9 fixes the adapter 7 and the first flange 5. When viewed from the axis O direction, the first fixing member 8 and the second fixing member 9 are arranged at positions different from each other. The first fixing member 8 and the second fixing member 9 of the present embodiment are bolts.

  The position of the first fixing member 8 corresponds to the positions of the first female screw hole 35 of the case 4 and the second screw insertion hole 73 of the adapter 7 when viewed from the axis O direction. The first fixing member 8 meshes with the first female screw hole 35 of the case 4 after passing the shaft portion through the second screw insertion hole 73 of the adapter 7. Thereby, the adapter 7 is detachably fixed to the first end face 34 of the case 4. In this state, the head of the first fixing member 8 is accommodated in the recess 76 formed in the first end face 75 of the adapter 7, and does not project from the first end face 75 of the adapter 7.

  As shown in FIGS. 1 and 2, the position of the second fixing member 9 corresponds to the positions of the second female screw hole 74 of the adapter 7 and the first screw insertion hole 42 of the first flange 5 when viewed from the axis O direction. . The second fixing member 9 engages with the second female screw hole 74 of the adapter 7 after passing the shaft portion through the first screw insertion hole 42 of the first flange 5. Thereby, the first flange 5 is detachably fixed to the first end face 75 of the adapter 7.

<Effects>
When the electric motor 1 of the present embodiment is driven, the temperature of the coil 22 becomes high. For this reason, in the electric motor 1 of the present embodiment, the cooling oil is supplied to the inner space 31 of the case 4.
Cooling oil is supplied to the center hole 10a of the rotating shaft 11 from outside through the flange-side flow path 10d of the first flange 5. The cooling oil supplied to the center hole 10a of the rotating shaft 11 flows through the radial hole 10b and the axial flow path 10c, and the flow paths (not shown) formed in the rotor core 12 and the end plates 13 and 14. Thus, the rotor core 12 can be cooled. The cooling oil discharged from the flow path of the rotor core 12 and the end plates 13 and 14 into the inner space 31 of the case 4 is supplied to the coil 22 to cool it. The cooling oil discharged into the inner space 31 of the case 4 is discharged to the outside of the electric motor 1 through the through hole 36 of the case 4.

According to the electric motor 1 according to the present embodiment, the first fixing member 8 for fixing the adapter 7 and the case 4 and the second fixing member 9 for fixing the adapter 7 and the first flange 5 are arranged from the axis O direction. Seen at different positions from each other. Therefore, the case 4 and the first flange 5 having different mounting structures can be connected by the adapter 7. Accordingly, a new motor 1 can be manufactured by using the case 4 and the first flange 5 from existing motors 1 different from each other. That is, the manufacturing cost of the new electric motor 1 can be reduced.
In particular, in the electric motor 1 of the present embodiment, the first flange 5 has a complicated configuration including the wiring portion 44 and the flow path forming portion 10d1. For this reason, the fact that the first flange 5 can be used can effectively reduce the manufacturing cost of the electric motor 1 as compared with the case where the first flange 5 is newly designed.

  Further, according to the electric motor 1 according to the present embodiment, the adapter 7 separates the inner space 31 of the case 4 containing the rotor core 12 and the stator 3 from the outer space 77 in which the first bearing 40 is disposed. 72. Therefore, even if the first flange 5 is detached from the adapter 7 or the rotating shaft 11 as illustrated in FIG. 3 in order to perform maintenance or replacement of the first bearing 40, the first opening 32 of the case 4 is It can be held in a state covered by the partition wall portion 72. Thereby, even if the first flange 5 is removed, it is possible to suppress dust from entering the inner space 31 of the case 4. As a result, it is possible to prevent dust from adhering to the coil 22 of the stator 3 and causing insulation failure in the coil 22.

  Further, since the adapter 7 includes the partition wall portion 72, it is possible to suppress the cooling oil discharged into the inner space 31 of the case 4 from entering the outer space 77. For this reason, it is possible to suppress the cooling oil from reaching the first bearing 40, and it is possible to suppress the deterioration of the function of the first bearing 40 due to the cooling oil. The function deterioration of the first bearing 40 due to the cooling oil is caused by the fact that the grease sealed in the first bearing 40 flows out of the first bearing 40 as the cooling oil flows so as to contact the first bearing 40. I do.

Further, according to the electric motor 1 according to the present embodiment, the gap between the inner periphery of the shaft insertion hole 78 of the partition wall portion 72 through which the rotating shaft 11 passes and the outer periphery of the rotating shaft 11 is filled with the oil seal 79. For this reason, even if the first flange 5 is removed from the adapter 7 and the rotating shaft 11 as illustrated in FIG. 3, the dust passes through the gap between the inner periphery of the shaft insertion hole 78 and the outer periphery of the rotating shaft 11 and the inner space of the case 4. 31 can be prevented. Therefore, occurrence of poor insulation of the coil 22 due to the adhesion of dust to the coil 22 can be further suppressed.
Further, it is possible to prevent the cooling oil discharged into the inner space 31 of the case 4 from entering the inner space 31 of the case 4 through a gap between the inner circumference of the shaft insertion hole 78 and the outer circumference of the rotating shaft 11. Therefore, it is possible to further suppress the cooling oil from reaching the first bearing 40.

  Further, according to the electric motor 1 according to the present embodiment, the communication hole 85 connecting the inner space 31 and the outer space 77 of the case 4 is provided in a portion of the partition wall portion 72 that is located outside the first bearing 40 in the radial direction. Are formed. For this reason, by arranging the electric motor 1 so that the communication hole 85 is located below the first bearing 40 in the vertical direction, the cooling oil leaked from the inner space 31 to the outer space 77 temporarily accumulates in the outer space 77. However, the accumulated cooling oil returns to the inner space 31 through the communication hole 85. Thereby, the liquid level of the cooling oil accumulated in the outer space 77 can be prevented from reaching the first bearing 40.

  In addition, according to the electric motor 1 according to the present embodiment, the partition walls 72 of the adapter 7 are formed with the wiring holes 81 and 82 for passing the wiring between the inner space 31 and the outer space 77. For this reason, even if the inner space 31 and the outer space 77 are partitioned by the partition wall 72, the wiring extending from the electric components such as the coil 22 and the temperature sensor 25 disposed in the inner space 31 of the case 4 can be replaced by the partition wall 72. Can be drawn out to the outer space 77 through the wiring holes 81 and 82.

<Other embodiments>
The embodiments of the present invention have been described above, but the present invention is not limited thereto, and can be appropriately changed without departing from the technical idea of the present invention.

The electric motor of the present invention may include an adapter 207 illustrated in FIG. 5 instead of the adapter 7 of the above embodiment. The adapter 207 illustrated in FIG. 5 includes a main body 271, a shield 272, and a connection 273.
The main body 271 is configured similarly to the main body 71 of the adapter 7 of the above embodiment.

  The shielding portion 272 is located radially inward with respect to the main body portion 271 with an interval. The shielding portion 272 is arranged so as to cover the first bearing 40 from the case 4 side in the direction of the axis O (the direction orthogonal to the plane of FIG. 5). The shielding portion 272 has a shaft insertion hole 278 through which the rotating shaft 11 passes. For this reason, the shielding part 272 is formed in an annular shape when viewed from the axis O direction. In FIG. 5, the outer edge of the shielding portion 272 is formed in a circular shape, but may be formed in a polygonal shape, for example. An oil seal 279 may be provided between the rotation shaft 11 and the inner periphery of the shaft insertion hole 278 of the shielding part 272.

  The connection part 273 extends from the main body part 271 to the shielding part 272 and connects the main body part 271 and the shielding part 272. The specific configuration of the connection unit 273 may be arbitrary. In the adapter 207 shown in FIG. 5, the connection portion 273 is formed in a rod shape or a strip shape extending in the radial direction of the main body portion 271. A plurality of (four in the illustrated example) connection portions 273 are arranged at intervals in the circumferential direction of the main body portion 271.

  In the motor including the adapter 207 illustrated in FIG. 5, the first bearing 40 is covered by the shield 272. For this reason, even if the cooling oil flows in the inner space 31 of the case 4, it is possible to suppress the cooling oil from reaching the first bearing 40. That is, similarly to the above embodiment, deterioration of the function of the first bearing 40 due to the cooling oil can be suppressed.

In the electric motor of the present invention, for example, the first fixing member 8 for fixing the adapters 7 and 207 and the case 4 and the second fixing member 9 for fixing the adapter 7 and the first flange 5 are viewed from the axis O direction. And may be arranged at the same position as each other.
Further, in the electric motor of the present invention, the case 4, the adapters 7, 207, and the first flange 5 may be fixed together by the same fixing member (for example, bolt). That is, the shaft portion of the bolt is inserted through the first flange 5 and the adapters 7 and 207 in order, and then meshed with the first female screw hole 35 of the case 4, so that the case 4, the adapters 7 and 207 and the first flange 5 may be fixed.

In the electric motor of the present invention, the adapters 7 and 207 may be provided, for example, between the case 4 and the second flange 6.
In the electric motor of the present invention, the second flange 6 may be formed integrally with the case 4, for example. That is, the case 4 may be formed, for example, in a bottomed cylindrical shape that opens only in one direction in the axis O direction.

  The electric motor of the present invention is not limited to an oil-cooled electric motor that performs heat exchange between the cooling oil and the coil 22 of the stator 3. That is, the electric motor of the present invention does not need to include, for example, the supply flow path 10 and the cooling oil circulation unit 90. The electric motor of the present invention may be applied to, for example, a so-called air-cooled electric motor that performs heat exchange between the case 4 and the flanges 5 and 6 and the air in contact with the outer peripheral portions thereof.

  The electric motor of the present invention may be a motor that drives and rotates a rotor by passing an alternating current through a coil of a stator, or may be a generator that generates electric power by rotating the rotor with the power of an engine or the like.

  The electric motor according to the present invention may be a so-called axial gap electric motor in which the rotor core and the stator are arranged to face each other in the axial direction of the rotation shaft with a gap therebetween.

  INDUSTRIAL APPLICABILITY The electric motor of the present invention is suitable as an electric motor used for a machine (for example, a working vehicle such as a hydraulic shovel, a bulldozer, or a forklift) whose production quantity is smaller than that of a passenger car or a home appliance.

DESCRIPTION OF SYMBOLS 1 ... Electric motor, 2 ... Rotor, 3 ... Stator, 4 ... Case, 5 ... First flange, 6 ... Second flange, 7 ... Adapter, 8 ... First fixing member, 9 ... Second fixing member, 10 ... Supply flow Road, 11: rotating shaft, 12: rotor core, 21: stator core, 22: coil, 31: inner space, 32, 33: opening, 35: first female screw hole, 40: first bearing (grease-enclosed bearing), 42 ... first screw insertion hole, 71 ... main body part, 72 ... partition wall part, 73 ... second screw insertion hole, 74 ... second female screw hole, 78 ... shaft insertion hole, 79 ... oil seal, 81, 82 ... wiring hole , 85: communication hole, 90: cooling oil circulation part, 207: adapter, 271: main body part, 272 ... shielding part, 273 ... connection part, 278 ... shaft insertion hole, O: axis line

Claims (9)

A rotating shaft, and a rotor having a rotor core fixed to the rotating shaft;
A stator facing the rotor core with a gap therebetween,
A case that has an opening in the axial direction of the rotating shaft and houses the rotor core and the stator;
A flange disposed opposite to the opening in the axial direction;
An electric motor comprising: an adapter disposed between the case and the flange.   2. The adapter according to claim 1, wherein the adapter has a shaft insertion hole through which the rotating shaft passes, and includes a partition part that partitions an inner space of the case in which the rotor core and the stator are housed and an outer space of the case. 3. An electric motor as described.   The electric motor according to claim 2, wherein a wiring hole for passing wiring between the inner space and the outer space is formed in the partition.   Claims: A supply channel for supplying cooling oil to a coil constituting the stator, and a cooling oil circulation unit for supplying the cooling oil discharged from the inner space to the outside of the case again to the supply channel. The electric motor according to claim 2 or 3.   5. The communication hole according to claim 4, wherein the partition wall has a communication hole that connects the inner space and the outer space and returns the cooling oil leaked from the inner space to the outer space to the inner space. 6. Electric motor. The adapter is
An annular body portion sandwiched between the case and the flange,
A shielding portion having a shaft insertion hole, which is located at an interval radially inward of the main body portion and through which the rotating shaft passes,
2. The electric motor according to claim 1, further comprising: a connecting portion extending from the main body to the shielding portion and connecting the main body and the shielding portion. 3. A bearing that rotatably supports the rotating shaft is provided between the rotating shaft and the flange,
The electric motor according to any one of claims 1 to 6, wherein the bearing is a grease-enclosed bearing.   The electric motor according to any one of claims 1 to 7, wherein an oil seal is provided between the rotating shaft and the adapter. A first fixing member for fixing the adapter and the case,
A second fixing member for fixing the adapter and the flange,
The electric motor according to any one of claims 1 to 8, wherein the first fixing member and the second fixing member are arranged at different positions when viewed from the axial direction.

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