motor

Abstract

We propose a technology to further improve heat dissipation from the case. [Solution] The motor has a case with ribs on its outer surface. The ribs have a first portion and a second portion that protrudes less from the outer surface than the first portion. The first portion extends in a polygonal grid pattern, and the second portion is adjacent to the first portion and extends along the first portion. Since the ribs provided on the motor case have a first portion with a large protrusion and a second portion with a small protrusion, heat can be efficiently dissipated from the case.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a motor.

Background Art

[0002] In the motor disclosed in Patent Document 1, ribs are provided on the wall surface of the case. The ribs extend in a hexagonal lattice pattern.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the motor operates, the entire motor generates heat. The heat generated in the motor is released to the outside through the case. In this specification, a technique for further improving the heat dissipation amount from the case is proposed.

Means for Solving the Problems

[0005] The motor disclosed in this specification has a case provided with ribs on its outer peripheral surface. The rib has a first portion and a second portion whose protrusion amount from the outer peripheral surface is smaller than that of the first portion. The first portion extends in a polygonal lattice pattern, the second portion is adjacent to the first portion, and extends along the first portion.

[0006] Since the rib provided on the case of the above - mentioned motor has a first portion with a large protrusion amount and a second portion with a small protrusion amount, heat can be efficiently dissipated from the case.

Brief Description of the Drawings

[0007] [Figure 1] It is a plan view of the motor. [Figure 2]This is a side view of the motor. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 2. [Figure 4] This is a cross-sectional view of a modified motor. [Modes for carrying out the invention]

[0008] The motor described above is housed in the case and may further include a cooling pipe that discharges coolant into the case. The ribs may be positioned to overlap with the cooling passage when viewed along the radial direction of the motor.

[0009] "Radial direction" refers to the direction along the radius of the circle centered on the motor's axis of rotation.

[0010] In this motor, ribs are present near the cooling pipes. As a result, the temperature of the refrigerant flowing through the cooling pipes tends to drop.

[0011] The motor described above may have the first portion extending in a hexagonal grid pattern.

[0012] The motor 100 shown in Figure 1 has a rotor 10, a stator 20, and a case 50. The stator 20 has a cylindrical shape. The rotor 10 is positioned within the central hole of the stator 20 such that the central axis of the rotor 10 coincides with the central axis of the stator 20. The rotor 10 and the stator 20 are housed in the case 50. Hereinafter, the direction parallel to the rotation axis X of the motor 100 (i.e., the central axis of the rotor 10) will be referred to as the axial direction, the direction along the radius of the circle centered on the rotation axis X of the motor 100 will be referred to as the radial direction, and the direction along the circle centered on the rotation axis X of the motor 100 will be referred to as the circumferential direction.

[0013] The case 50 has an outer circumferential surface 52. The outer circumferential surface 52 has a polygonal cylindrical shape that extends along the axial direction. Ribs 60 are provided on the outer circumferential surface 52. The ribs 60 are provided on the upper part of the case 50. The ribs 60 protrude from the outer circumferential surface 52 toward the outside of the case 50.

[0014] As shown in Figures 2 and 3, the rib 60 has a first portion 62 and a second portion 64. As shown in Figure 3, the first portion 62 and the second portion 64 protrude outward from the outer peripheral surface 52 of the case 50. The second portion 64 protrudes less from the outer peripheral surface 52 than the first portion 62. That is, the height H2 from the outer peripheral surface 52 to the tip surface 64a of the second portion 64 is lower than the height H1 from the outer peripheral surface 52 to the tip surface 62a of the first portion 62. The tip surface 64a of the second portion 64 is located closer to the outer peripheral surface 52 than the tip surface 62a of the first portion 62. Therefore, a step is formed in the rib 60 by the first portion 62 and the second portion 64.

[0015] As shown in Figure 2, the first part 62 extends in a hexagonal grid pattern on the outer surface 52. In other words, the first part 62 has a honeycomb structure. That is, the first part 62 spreads out in a mesh-like manner to form multiple regular hexagons. Each side of each regular hexagon formed by the first part 62 is shared with the sides of other adjacent hexagons. Therefore, the first part 62 has a structure in which multiple ribs of regular hexagons are arranged without gaps. A recess 70 is provided in the center of each regular hexagon formed by the first part 62.

[0016] The second portion 64 is provided within the recess 70. The second portion 64 is positioned adjacent to the first portion 62 and extends along the side surface 62b of the first portion 62. The second portion 64 has a regular hexagonal shape that extends along the first portion 62.

[0017] The motor 100 has a cooling pipe 40. The cooling pipe 40 is housed in the case 50. The cooling pipe 40 is provided at a position overlapping with the rib 60 when viewed along the radial direction. The cooling pipe 40 is located above the stator 20 and at a position separated from the stator 20. The cooling pipe 40 extends along the axial direction. Refrigerant (e.g., oil) supplied from the outside flows through the cooling pipe 40. The refrigerant discharge port 42 provided in the cooling pipe 40 discharges the refrigerant from the cooling pipe 40 toward the stator 20. Thereby, the stator 20 is cooled.

[0018] During the operation of the motor 100, the motor 100 generates heat. The heat generated by the motor 100 is released to the outside through the case 50. Ribs 60 are provided on the outer peripheral surface 52 of the case 50. Therefore, the ribs 60 release the heat generated by the motor 100 to the outside. As described above, since the ribs 60 have the first part 62 and the second part 64, the amount of heat radiation from the case 50 increases, and the motor 100 can be cooled efficiently.

[0019] During the operation of the motor 100, the refrigerant flowing through the cooling pipe 40 is discharged from the refrigerant discharge port 42 toward the stator 20. The stator 20 is cooled by the discharged refrigerant. When viewed along the radial direction, the rib 60 is provided at a position overlapping with the cooling pipe 40. Therefore, the heat of the refrigerant flowing through the cooling pipe 40 is easily released to the outside through the rib 60. As a result, the temperature of the refrigerant flowing through the cooling pipe 40 decreases, and the motor 100 can be cooled more efficiently.

[0020] In the above-described embodiment, as shown in FIG. 4, a chamfered portion 66 may be provided at the corner between the front end surface 62a of the first part 62 and the side surface 62b of the first part 62. Also, a chamfered portion 68 may be provided at the corner between the front end surface 64a of the second part 64 and the side surface 64b of the second part 64. By providing the chamfered portions 66 and 68 in this way, the motor 100 can be cooled more efficiently.

[0021] In the above-described embodiment, the first portion 62 of the rib 60 extended so as to form a plurality of regular hexagons. However, the first portion 62 of the rib 60 may extend so as to form a plurality of polygons other than regular hexagons. That is, the first portion 62 of the rib 60 may extend in a polygonal lattice pattern.

[0022] As described above, the embodiments have been described in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in this specification or the drawings achieves a plurality of purposes simultaneously, and has technical utility by achieving one of those purposes itself.

Explanation of Reference Numerals

[0023] 10: Rotor, 20: Stator, 40: Cooling pipe, 50: Case, 52: Outer peripheral surface, 60: Rib, 62: First portion, 64: Second portion, 100: Motor

Claims

1. It is a motor, It has a case with ribs provided on its outer surface, The rib has a first portion and a second portion that protrudes less from the outer surface than the first portion. The aforementioned first part extends in a polygonal grid pattern, The second part is adjacent to the first part and extends along the first part. Motor.

2. The case is housed within the aforementioned case and further comprises a cooling pipe that discharges a cooling liquid into the aforementioned case, The motor according to claim 1, wherein the rib is provided in a position that overlaps with the cooling pipe when viewed along the radial direction of the motor.

3. The motor according to claim 1 or 2, wherein the first portion extends in a hexagonal grid pattern.

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