CN115053434B - Cooling liquid passage structure of motor and manufacturing method of motor - Google Patents
Cooling liquid passage structure of motor and manufacturing method of motor Download PDFInfo
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- CN115053434B CN115053434B CN202080095726.1A CN202080095726A CN115053434B CN 115053434 B CN115053434 B CN 115053434B CN 202080095726 A CN202080095726 A CN 202080095726A CN 115053434 B CN115053434 B CN 115053434B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Motor Or Generator Frames (AREA)
- Motor Or Generator Cooling System (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
In a cooling liquid passage structure of a motor or the like, a housing (1) is cast using a cylindrical core (8) having a through hole (80 c) penetrating in the radial direction in the region on the upper side in the vertical direction, and a volume reduction portion (70) for reducing the volume of a cooling liquid passage (7) is provided in the region on the upper side in the vertical direction of the cooling liquid passage (7). By providing the volume reducing portion (70), a narrow coolant passage (71 a) is formed in a region on the upper side in the vertical direction of the coolant passage (7) where air is likely to stay, and the flow velocity of the coolant flowing through the narrow coolant passage (71 a) is increased. Thus, when the coolant is filled in the coolant passage (7), the air staying in the region on the upper side in the vertical direction of the coolant passage (7) can be easily pushed out to the discharge port (14) by the coolant having the increased flow velocity, and the air contained in the coolant can be efficiently discharged through the discharge port (14).
Description
Technical Field
The present invention relates to a cooling liquid passage structure of a motor and a method of manufacturing the motor.
Background
As a conventional cooling liquid passage structure of a motor, for example, a structure described in the following patent documents is known.
That is, in the conventional cooling liquid passage structure of the motor, a cooling liquid passage through which a cooling liquid flows is provided inside a housing that houses motor components. The cooling liquid passage is provided in a substantially annular shape, and the inlet port and the outlet port are arranged in parallel adjacent to each other at a horizontal position which is a rotation center position of the motor.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 6106873
Disclosure of Invention
Problems to be solved by the invention
However, in the conventional cooling liquid passage structure of the motor, the inlet and the outlet are disposed at the horizontal positions. Therefore, when the coolant contains air (bubbles), there is a problem that: the air stays and remains at a position higher than the horizontal position, that is, at a position vertically higher than the horizontal position, for example, along a wall surface vertically higher than the coolant passage.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a cooling liquid passage structure of a motor capable of efficiently discharging air contained in cooling liquid, and a method of manufacturing the motor.
Means for solving the problems
As an aspect of the present invention, a cooling liquid passage structure of a motor includes: a motor member that rotationally drives the rotational shaft; a cylindrical housing provided on an outer peripheral side of the motor member and accommodating the motor member; a coolant passage provided in the housing in a substantially annular shape in a circumferential direction of the rotary shaft, defined by an outer circumferential wall of the housing and an inner circumferential wall of the housing, and through which coolant flows; an inlet port that is connected to the coolant passage at a position on one end side in the axial direction of the rotating shaft and introduces the coolant into the coolant passage; a discharge port that is connected to the coolant passage at a position on the other end side in the axial direction, and discharges the coolant in the coolant passage; and a volume reducing portion that is provided integrally with the outer peripheral wall or the inner peripheral wall of the housing in the circumferential region on the upper side in the vertical direction than the rotation center of the rotation shaft except for the end portion on the upper side in the vertical direction, and reduces the volume of the coolant passage.
In this way, in the cooling liquid passage structure of the motor of the present invention, the volume of the cooling liquid passage is reduced by the volume reducing portion, and therefore the flow velocity of the cooling liquid in the region on the upper side in the vertical direction of the cooling liquid passage can be increased. This makes it easy to push out the air contained in the coolant as the coolant is discharged, and therefore, the air contained in the coolant can be efficiently discharged.
Further, since the volume reducing portion is provided in the circumferential region of the coolant passage except for the vertically upper end portion, a passage that penetrates in the axial direction is secured at the vertically upper end portion of the coolant passage, and the coolant can flow in the axial direction. This makes it possible to effectively discharge the air staying at the upper end portion in the vertical direction of the coolant passage.
In another aspect of the above motor coolant passage structure, the volume reducing portion may be formed by a connecting portion connecting an outer peripheral wall of the housing and an inner peripheral wall of the housing.
In this way, the volume reducing portion is formed by connecting the outer peripheral side wall surface and the inner peripheral side wall surface of the coolant passage, and the casing can be cast using an annular core having a through hole penetrating in the radial direction, thereby easily forming the coolant passage and the volume reducing portion. Thereby, good productivity of the motor can be ensured.
In addition, as another aspect of the above-described structure of the cooling liquid passage of the motor, it is preferable that a plurality of the volume reducing portions are provided in an axial direction of the rotating shaft.
By providing a plurality of volume reducing portions in the axial direction in this way, the flow velocity of the coolant can be increased over a wider range in the axial direction in the region above the coolant passage in the vertical direction. This enables air contained in the coolant to be discharged more efficiently.
In another aspect of the above structure of the cooling liquid passage for the motor, it is preferable that the cooling liquid passage includes an upper passage and a lower passage, the upper passage is formed above a rotation center of the rotation shaft in a vertical direction, the lower passage is formed below the rotation center of the rotation shaft in the vertical direction, and the volume reducing portion reduces a volume of the upper passage by 1 to 10% with respect to a volume of the lower passage.
In this way, by reducing the volume of the upper passage where the air stays by 1 to 10% from the volume of the lower passage, it is possible to achieve both the improvement of the flow velocity of the coolant in the upper passage and the cooling of the motor component by the coolant. In particular, by setting the volume reduction rate of the upper passage obtained by the volume reduction unit to 1 to 10%, the flow rate of the cooling liquid required for cooling the motor component in the upper passage can be ensured, and good cooling performance for the motor component can be obtained.
In addition, as another aspect of the cooling liquid passage structure of the motor, it is preferable that a distance from a rotation center of the rotating shaft to an outer peripheral wall surface of the cooling liquid passage gradually increases from the inlet port side to the outlet port side in an axial direction of the rotating shaft.
In this way, by forming the distance from the rotation center of the rotation shaft to the wall surface on the upper side in the vertical direction of the coolant passage so as to gradually increase from the inlet side to the outlet side, the air contained in the coolant can be moved along the wall surface on the upper side in the vertical direction of the coolant passage to the outlet side. This enables air contained in the coolant to be discharged from the discharge port more efficiently.
In another aspect of the present invention, a method for manufacturing a motor, the motor including: a motor member that rotationally drives the rotational shaft; a casing which is formed by casting, has a cylindrical shape, and accommodates the motor component on an inner circumferential side; a coolant passage provided in the housing in a substantially annular shape in a circumferential direction of the rotary shaft, defined by an outer circumferential wall of the housing and an inner circumferential wall of the housing, and through which coolant flows; an inlet port that is connected to the coolant passage at a position on one end side in the axial direction of the rotating shaft and introduces the coolant into the coolant passage; and an outlet port that is connected to the coolant passage at a position on the other end side in the axial direction and discharges the coolant in the coolant passage, wherein the coolant passage is formed by using a core at the time of casting, the core is formed in a substantially cylindrical shape, and a through hole that penetrates in a radial direction of the rotating shaft is provided in a region in the circumferential direction other than an end portion on the upper side in the vertical direction with respect to a rotation center of the rotating shaft.
In this way, by casting the case using the cylindrical core having the through hole along the radial direction in the vertically upper region, the volume reducing portion that reduces the volume of the coolant passage can be provided in the vertically upper region of the coolant passage. This can increase the flow velocity of the coolant in the region above the coolant passage in the vertical direction, and can efficiently discharge the air contained in the coolant.
In another aspect of the above structure of the cooling liquid passage for the motor, it is preferable that a plurality of the through holes are provided.
By providing a plurality of through holes in this manner, a plurality of volume reducing portions can be formed in the region on the upper side in the vertical direction of the coolant passage. This makes it possible to increase the flow velocity of the coolant over a wider range in the axial direction in the region above the coolant passage in the vertical direction, and to more efficiently discharge the air contained in the coolant.
Effects of the invention
According to the present invention, the volume reducing portion reduces the volume of the vertically upper side of the coolant passage, thereby increasing the flow velocity of the coolant in the vertically upper region of the coolant passage. This makes it easy to push out the air contained in the coolant as the coolant is discharged, and the air contained in the coolant can be efficiently discharged.
Drawings
Fig. 1 is a perspective view of a motor for explaining a coolant passage structure of the motor according to the present invention.
Fig. 2 is a plan view of the motor viewed from the direction a of fig. 1.
Fig. 3 shows embodiment 1 of the present invention, and is a longitudinal sectional view of a motor corresponding to a section taken along line B-B in fig. 2.
Fig. 4 shows a core for forming the coolant passage shown in fig. 3, wherein (a) is a perspective view and (b) is a cross-sectional view taken along line C-C of fig. 3.
Fig. 5 is a side view of the motor for explaining the operation of the cooling liquid passage structure of the motor of the present invention, (a) is a perspective view, and (b) is a front view.
Fig. 6 is a side view of a conventional motor for explaining a coolant passage structure of the motor, where (a) is a perspective view and (b) is a front view.
Detailed Description
Embodiments of a cooling liquid passage structure of a motor and a method for manufacturing the motor according to the present invention will be described below in detail with reference to the accompanying drawings. In the following embodiments, the cooling liquid passage structure of the motor and the method for manufacturing the motor according to the present invention are applied to the cooling structure of the water-cooled motor in the same manner as the conventional one.
Fig. 1 is a perspective view of the motor M as viewed from obliquely above. Fig. 2 shows a view of the motor M viewed from the direction a shown in fig. 1. Fig. 3 shows embodiment 1 of the present invention, and is a longitudinal sectional view of motor M taken along line B-B shown in fig. 2. Fig. 4 shows a core 8 for forming the coolant passage 7 shown in fig. 3, wherein (a) is a perspective view and (b) is a cross-sectional view taken along the line C-C of fig. 4 (a). In the description of the drawings, a direction parallel to the central axis Z of the rotary shaft 4 of the motor M is referred to as an "axial direction", a direction orthogonal to the central axis Z is referred to as a "radial direction", and a direction around the central axis Z is referred to as a "circumferential direction".
Structure of motor
As shown in fig. 1 to 3, the motor M of the present embodiment includes a housing 1, a stator 2, a rotor 3, and a rotating shaft 4, wherein the housing 1 is made of metal and formed in a cylindrical shape, the stator 2 is housed and held inside the housing 1, the rotor 3 is rotatably disposed inside the stator 2 with a slight gap G therebetween, and the rotating shaft 4 is press-fitted and fixed inside the rotor 3 and rotates integrally with the rotor 3. In addition, the stator 2 and the rotor 3 constitute a motor component of the present invention.
The case 1 is formed by casting a metal material, for example, an aluminum alloy, and the case 1 is formed in a bottomed cylindrical shape having an opening at the other end side in the axial direction and a closed end side, and a cylindrical peripheral wall 11 and a disc-shaped bottom wall 12 are integrally formed. The opening at the other end side of the housing 1 is closed by a disk-shaped cover 5. That is, the housing 1 and the cover 5 define a motor housing portion 10, and the motor housing portion 10 houses the stator 2 and the rotor 3 therein.
A 1 st shaft through hole 12a is formed through a central portion of the bottom wall 12 of the housing 1, the 1 st shaft through hole 12a is through which the distal end portion 4a of the rotating shaft 4 facing the outside is inserted, and a 1 st bearing 61 for rotatably supporting the distal end portion 4a side of the rotating shaft 4 is provided on an inner circumferential side of the 1 st shaft through hole 12 a. Similarly, a 2 nd shaft through hole 5a through which the base end portion 4b of the rotary shaft 4 is inserted is formed in the center portion of the cover plate 5, and a 2 nd bearing 62 for rotatably supporting the base end portion 4b of the rotary shaft 4 is provided on the inner peripheral side of the 2 nd shaft through hole 5 a.
Further, a coolant passage 7 through which a coolant (e.g., cooling water) for cooling the motor M (stator 2) flows is formed inside the casing 1. The coolant passage 7 is formed in a substantially annular shape continuous in the circumferential direction and over substantially the entire axial region, and is formed such that a distance R from the rotation center (center axis Z) of the rotary shaft 4 to the outer peripheral side wall surface 7a gradually increases toward the other axial end side (the cover plate 5 side). More specifically, the coolant passage 7 is formed in a conical shape in which the outer peripheral side wall surface 7a is inclined upward toward the other end side (the cover plate 5 side) in the axial direction, and the inner peripheral side wall surface 7b is formed in a horizontal shape in the axial direction.
Further, the coolant passage 7 is provided with a plurality of volume reducing portions 70 (3 in the present embodiment), which are provided integrally with the housing 1 and occupy a part of the coolant passage 7, thereby reducing the internal volume of the coolant passage 7. Each of the volume reducing portions 70 has a columnar shape, is a connecting portion connecting the outer peripheral side wall surface 7a and the inner peripheral side wall surface 7b of the coolant passage 7, and is formed integrally with the casing 1 in the radial direction. The volume reducing portions 70 are formed integrally with the casing 1 so as to connect the outer peripheral side wall surface 7a and the inner peripheral side wall surface 7b of the coolant passage 7, and also function as ribs that improve the rigidity of the casing 1 in which the coolant passage 7 is formed. By providing the volume reducing portions 70, narrow coolant passages 71a having a smaller flow path cross-sectional area than other portions are formed between the volume reducing portions 70.
The volume reducing portions 70 are not limited to the circumferential positions shown in fig. 2 and 3, and may be disposed at any position in the upper region of the coolant passage 7 in the vertical direction, depending on, for example, the specification of the motor M. In addition, the arrangement of the respective volume reducing portions 70 described above may be such that, in addition to the configuration in which the volume reducing portions 70 are arranged in parallel in the axial direction at the same circumferential position as in the present embodiment, a part of each volume reducing portion 70 may be arranged at a different circumferential position.
The coolant passage 7 includes an upper passage 71 and a lower passage 72, the upper passage 71 is formed vertically above the rotation center (center axis Z) of the rotation shaft 4, the lower passage 72 is formed vertically below the rotation center (center axis Z) of the rotation shaft 4, and the volume of the upper passage 71 is 1 to 10% smaller than the volume of the lower passage 72. That is, the volume of each of the volume reducing portions 70 corresponds to 1 to 10% of the volume of the upper passage 71, and the volume of the upper passage 71 is reduced by 1 to 10% from the volume of the lower passage 72 by the volume reducing portions 70.
In addition, when the case 1 is cast, the coolant passage 7 and the volume reducing portion 70 are formed by the so-called collapsible core 8 formed in a substantially cylindrical shape as shown in fig. 4. The core 8 has a core body 80, an inlet forming portion 81, and an outlet forming portion 82, the core body 80 being cylindrical, the inlet forming portion 81 being provided to project in a substantially tangential direction on an outer peripheral side of an axial end portion on a small diameter side of the core body 80, and the outlet forming portion 82 being provided to project in an axial direction on an axial end surface on a large diameter side of the core body 80. The core body 80 has a conical tapered surface 80a on the outer peripheral side, a horizontal surface 80b on the inner peripheral side along the axial direction, and a plurality of (3 in the present embodiment) through holes 80c penetrating in the radial direction are provided in parallel in the axial direction in a region on the upper side in the vertical direction. With this core 8, when the housing 1 is cast, the coolant passage 7 is formed by the core main body 80, and the volume reducing portions 70 are formed by the through holes 80c. The inlet 13 described later is formed by the inlet forming portion 81, and the outlet 14 described later is formed by the outlet forming portion 82.
An inlet port 13 is formed to protrude from the peripheral wall 11 on one end side (bottom wall 12 side) in the axial direction of the housing 1, and the inlet port 13 is cylindrical, extends in a tangential manner in the vertical direction, and is connected to the coolant passage 7 at a position overlapping the rotation center (center axis Z) of the rotary shaft 4 in the vertical direction. That is, the coolant is introduced into the coolant passage 7 from the outside of the casing 1 through the inlet port 13. In the present embodiment, the introduction port 13 is opened in the tangential direction with respect to the peripheral wall of the housing 1, but the opening direction of the introduction port 13 may be, for example, in the axial direction or the radial direction in addition to the tangential direction described above, and may be freely changed depending on the layout of the coolant passage 7 and the like.
On the other hand, a discharge port 14 is formed in the cover plate 5 in a protruding manner, and the discharge port 14 is cylindrical, is connected to the coolant passage 7 at a position overlapping with the rotation center (center axis Z) of the rotation shaft 4 in the vertical direction, and extends in the axial direction. That is, the coolant flowing through the coolant passage 7 is discharged to the outside of the casing 1 through the discharge port 14. In the present embodiment, the form in which the discharge port 14 is opened in the axial direction at the cover plate 5 corresponding to the axial end portion of the housing 1 is exemplified, but in the cooling liquid passage structure of the motor of the present invention, the discharge port 14 may be opened in a direction other than the upper side in the vertical direction in particular, and the opening direction of the discharge port 14 may be the axial direction, the radial direction, or the like, and may be freely changed depending on the layout of the cooling liquid passage 7 or the like.
Operation and effects of the present embodiment
Fig. 5 is a diagram for explaining the operation of the cooling liquid passage structure of the motor M according to the present embodiment, and (a) shows a perspective view of the motor M, and (b) shows a front view of the motor M. Fig. 6 is a view for explaining a cooling liquid passage structure of the conventional motor, and (a) shows a perspective view of the motor, and (b) shows a front view of the motor. For convenience of explanation, in the drawings, the coolant passage 7, the inlet 13, and the outlet 14 are indicated by solid lines, and the housing 1, the rotary shaft 4, and the cover 5 are indicated by phantom lines of two-dot chain lines. In the description of the drawings, a direction parallel to the center axis Z of the rotary shaft 4 of the motor M will be referred to as an "axial direction", a direction orthogonal to the center axis Z will be referred to as a "radial direction", and a direction around the center axis Z will be referred to as a "circumferential direction".
As shown in fig. 6, in the conventional cooling liquid passage structure of the motor M, the inlet 13 and the outlet 14 are arranged in the vicinity of a horizontal position H corresponding to a plane passing through the rotation center (central axis Z) of the motor M in the vertical direction. Therefore, when the coolant contains air a, there are the following problems: the air a remains at a position higher than the horizontal position H, that is, at a position vertically above the horizontal position H, for example, along the outer peripheral side wall surface 7a on the upper side in the vertical direction of the coolant passage 7. In this case, the portion where the air a remains may not contribute to cooling of the motor M, and the cooling efficiency of the motor M may be lowered.
Here, in the above-described conventional motor coolant passage structure, as a method of pushing out the air a staying at the end portion on the upper side in the vertical direction of the coolant passage 7 toward the discharge port 14, it is conceivable to increase the flow velocity of the coolant in the region on the upper side in the vertical direction of the coolant passage 7. In this case, as a method of increasing the flow velocity of the cooling water in the region above the cooling liquid passage 7 in the vertical direction, for example, it is considered to increase the pressure of a pump for pressurizing and conveying the cooling liquid and pressurize the cooling liquid flowing through the cooling liquid passage 7 by external fittings, but the capabilities of the fittings are limited and limited, and there is a problem that the above-described measures cannot be fundamentally taken.
In contrast, in the present embodiment, the housing 1 is cast using the cylindrical core 8 having the through hole 80c penetrating in the radial direction in the upper region in the vertical direction (see fig. 4), and the volume reducing portion 70 for reducing the volume of the coolant passage 7 is provided in the upper region in the vertical direction of the coolant passage 7 as shown in fig. 5. That is, the narrow coolant passage 71a is formed in the region of the volume reducing portion 70 on the upper side in the vertical direction of the coolant passage 7 where the air a tends to stay, and the flow velocity of the coolant (see arrow F in fig. 5) flowing through the narrow coolant passage 71a can be increased. Thus, when the coolant is filled in the coolant passage 7, the air a staying at the upper end portion in the vertical direction of the coolant passage 7 can be easily pushed out toward the discharge port 14 by the coolant having the increased flow velocity, and the air a contained in the coolant can be efficiently discharged through the discharge port 14.
In the present embodiment, the narrow coolant passage 71a is provided in a circumferential region other than the end portion on the upper side in the vertical direction of the coolant passage 7 where the air a tends to stay more in the upper region in the vertical direction of the coolant passage 7. In other words, the volume reducing portion 70 is not provided at the end portion on the upper side in the vertical direction in the coolant passage 7, and is configured as a passage that penetrates in the axial direction. Therefore, the volume of the coolant passage 7 can be secured to be large at the end portion on the upper side in the vertical direction of the coolant passage 7 where the air a tends to stay more. Thus, the air a staying at the vertically upper end of the coolant passage 7 can be discharged more efficiently than in the case where the volume reducing portion 70 is provided at the vertically upper end of the coolant passage 7 and the narrow coolant passage 71a is provided at the vertically upper end of the coolant passage 7.
In the present embodiment, the volume reducing portion 70 is formed by a connecting portion connecting the outer peripheral wall of the casing 1 (the outer peripheral side wall surface 7a of the coolant passage 7) and the inner peripheral wall of the casing 1 (the inner peripheral side wall surface 7b of the coolant passage 7). Therefore, by casting the case 1 using the annular core 8 in which the through holes 80c are formed in the upper region in the vertical direction, the coolant passage 7 and the volume reduction portion 70 can be easily formed. Thereby, good productivity of the motor M can be ensured.
In the present embodiment, a plurality of the volume reducing portions 70 are provided in the axial direction of the rotary shaft 4. Therefore, the flow velocity of the coolant can be increased in a wider range in the axial direction at the upper end portion in the vertical direction of the coolant passage 7. This enables the air a contained in the coolant to be discharged more efficiently.
In the present embodiment, the coolant passage 7 includes an upper passage 71 and a lower passage 72, the upper passage 71 is formed vertically above the rotation center (center axis Z) of the rotation shaft 4, the lower passage 72 is formed vertically below the rotation center (center axis Z) of the rotation shaft 4, and the volume reducing portions 70 reduce the volume of the upper passage 71 by 1 to 10% with respect to the volume of the lower passage 72.
Here, if the reduction rate of the volume of the upper passage 71 is made too high, the flow rate of the coolant increases, but the flow rate of the coolant flowing through the upper passage 71 decreases, and there is a possibility that sufficient cooling of the motor components cannot be achieved. By limiting the reduction rate of the volume of the upper passage 71 to 1 to 10% as in the present embodiment, the flow velocity of the coolant in the upper passage 71 can be increased and the motor components can be cooled by the coolant. That is, by setting the volume reduction rate of the upper passage 71 to 1 to 10% by the volume reduction portions 70, the flow rate of the coolant required for cooling the motor components in the upper passage 71 can be secured, and good cooling performance for the motor components can be obtained.
In the present embodiment, the distance from the rotation center (center axis Z) of the rotating shaft 4 to the outer peripheral wall surface 7a of the coolant passage 7 gradually increases from the inlet port 13 side to the outlet port 14 side in the axial direction of the rotating shaft 4. Therefore, the air a contained in the coolant can be moved toward the discharge port 14 along the outer peripheral side wall surface 7a of the coolant passage 7 and collected at the axial end portion on the discharge port 14 side. As a result, the air a collected at the axial end portion on the discharge port 14 side on the upper side in the vertical direction of the coolant passage 7 can be pushed out toward the discharge port 14 by the coolant having the flow velocity increased by the narrow coolant passage 71a, and the air a can be more efficiently discharged from the discharge port 14.
In the present embodiment, the housing 1 is cast using the cylindrical core 8 having the through holes 80c penetrating in the radial direction in the upper region in the vertical direction. Therefore, at the time of casting the case 1, the volume reducing portion 70 for reducing the volume of the coolant passage 7 can be provided in the upper region in the vertical direction of the coolant passage 7. This increases the flow velocity of the coolant in the region above the coolant passage 7 in the vertical direction, and allows the air a contained in the coolant to be efficiently discharged.
In the present embodiment, a plurality of through holes 80c are provided. Therefore, a plurality of volume reducing portions 70 can be formed in the region on the upper side in the vertical direction of the coolant passage 7. This increases the flow velocity of the coolant over a wider range in the axial direction in the region above the coolant passage 7 in the vertical direction, and allows the air a contained in the coolant to be discharged more efficiently.
The present invention is not limited to the configuration exemplified in the above embodiment, and can be freely modified in accordance with the specification of the application object and the like within the scope not departing from the gist of the present invention.
In particular, the form of the coolant passage 7 disclosed in the above embodiment is merely one example of the coolant passage structure of the motor of the present invention. In other words, the coolant passage 7 in the coolant passage structure of the motor of the present invention can take various forms depending on the specification of the motor M, the layout of the coolant passage 7, and the like, in addition to the above-described annular form, for example, a form in which one of the boundaries between the upper passage 71 and the lower passage 72 is discontinuous in the circumferential direction and has an arc-shaped cross section (C-shape), a spiral shape that rotates around the rotation center (central axis Z) of the rotation shaft 4, and the like.
Description of the reference numerals
1. A housing; 2. a stator (motor component); 3. a rotor (motor component); 4. a rotating shaft; 5. a cover plate (housing); 7. a coolant passage; 8. a core; 13. an inlet port; 14. an outlet port; 70. a volume reducing portion; 71. an upper side passage; 72. a lower passage; 81c, a through hole; m, a motor; z, central axis (center of rotation).
Claims (6)
1. A cooling liquid passage structure of an electric machine, characterized by comprising:
a motor member that rotationally drives the rotational shaft;
a cylindrical housing provided on an outer peripheral side of the motor member and accommodating the motor member;
a coolant passage provided in the housing in a substantially annular shape in a circumferential direction of the rotary shaft, defined by an outer circumferential wall of the housing and an inner circumferential wall of the housing, and through which a coolant flows;
an inlet port that is connected to the coolant passage at a position on one end side in the axial direction of the rotating shaft and introduces the coolant into the coolant passage;
a discharge port connected to the coolant passage at a position on the other end side in the axial direction, the discharge port discharging the coolant in the coolant passage; and
a volume reducing portion that is provided integrally with the outer peripheral wall or the inner peripheral wall of the housing in the circumferential region that is located on the upper side in the vertical direction with respect to the rotation center of the rotation shaft and that is other than the end portion on the upper side in the vertical direction, and that reduces the volume of the coolant passage,
the distance from the rotation center of the rotating shaft to the outer peripheral side wall surface of the coolant passage is gradually increased from the inlet port side to the outlet port side in the axial direction of the rotating shaft.
2. The cooling liquid passage configuration of an electric machine according to claim 1,
the volume reducing portion is constituted by a connecting portion connecting an outer peripheral wall of the housing and an inner peripheral wall of the housing.
3. The cooling liquid passage configuration of an electric machine according to claim 1,
the volume reducing portion is provided in plurality in the axial direction of the rotary shaft.
4. The cooling liquid passage configuration of an electric machine according to claim 1,
the coolant passage has an upper passage formed vertically above a rotation center of the rotating shaft and a lower passage formed vertically below the rotation center of the rotating shaft,
the volume reducing portion reduces the volume of the upper passage by 1% to 10% with respect to the volume of the lower passage.
5. A method for manufacturing a motor, the motor comprising:
a motor member that rotationally drives the rotational shaft;
a casing which is formed by casting, has a cylindrical shape, and accommodates the motor component on an inner circumferential side;
a coolant passage provided in the housing in a substantially annular shape in a circumferential direction of the rotary shaft, defined by an outer circumferential wall of the housing and an inner circumferential wall of the housing, and through which coolant flows;
an inlet port that is connected to the coolant passage at a position on one end side in the axial direction of the rotating shaft and introduces the coolant into the coolant passage; and
a discharge port connected to the coolant passage at a position on the other end side in the axial direction, the discharge port discharging the coolant in the coolant passage,
it is characterized in that the preparation method is characterized in that,
the cooling liquid passage is formed so that a distance from a rotation center of the rotating shaft to an outer peripheral wall surface of the cooling liquid passage gradually increases from the inlet port side to the outlet port side in an axial direction of the rotating shaft,
in the casting, the coolant passage is formed by using a core that is formed in a substantially cylindrical shape and has a through hole that penetrates in a radial direction of the rotating shaft in the circumferential region except for an end portion on the upper side in the vertical direction with respect to a rotation center of the rotating shaft.
6. The method of manufacturing an electric machine according to claim 5,
the through-hole is provided with a plurality of.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020019303A JP6885482B1 (en) | 2020-02-07 | 2020-02-07 | Motor coolant passage structure and motor manufacturing method |
| JP2020-019303 | 2020-02-07 | ||
| PCT/JP2020/035032 WO2021157118A1 (en) | 2020-02-07 | 2020-09-16 | Motor cooling liquid passage structure and motor manufacturing method |
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| Publication Number | Publication Date |
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| CN115053434A CN115053434A (en) | 2022-09-13 |
| CN115053434B true CN115053434B (en) | 2023-01-31 |
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| CN202080095726.1A Active CN115053434B (en) | 2020-02-07 | 2020-09-16 | Cooling liquid passage structure of motor and manufacturing method of motor |
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|---|---|
| JP (1) | JP6885482B1 (en) |
| CN (1) | CN115053434B (en) |
| WO (1) | WO2021157118A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008109817A (en) * | 2006-10-27 | 2008-05-08 | Nissan Motor Co Ltd | Motor having concentrated windings |
| CN203871969U (en) * | 2014-04-18 | 2014-10-08 | 比亚迪股份有限公司 | Motor cooling assembly and electric automobile with the same |
| WO2015098328A1 (en) * | 2013-12-27 | 2015-07-02 | 日立オートモティブシステムズ株式会社 | Rotating electric machine |
| JP2016144270A (en) * | 2015-01-30 | 2016-08-08 | 株式会社クボタ | Cooling structure of rotary electric machine |
| JP2018133898A (en) * | 2017-02-15 | 2018-08-23 | 三菱自動車工業株式会社 | Refrigerant passage structure of motor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3115698C1 (en) * | 1981-04-18 | 1982-12-16 | Alfred Kärcher GmbH & Co, 7057 Winnenden | Motor pump unit for a high pressure cleaning device |
| JP5075874B2 (en) * | 2009-06-02 | 2012-11-21 | 本田技研工業株式会社 | Electric motor |
| JP6302736B2 (en) * | 2014-04-28 | 2018-03-28 | 日立オートモティブシステムズ株式会社 | Rotating electric machine |
-
2020
- 2020-02-07 JP JP2020019303A patent/JP6885482B1/en active Active
- 2020-09-16 WO PCT/JP2020/035032 patent/WO2021157118A1/en active Application Filing
- 2020-09-16 CN CN202080095726.1A patent/CN115053434B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008109817A (en) * | 2006-10-27 | 2008-05-08 | Nissan Motor Co Ltd | Motor having concentrated windings |
| WO2015098328A1 (en) * | 2013-12-27 | 2015-07-02 | 日立オートモティブシステムズ株式会社 | Rotating electric machine |
| CN203871969U (en) * | 2014-04-18 | 2014-10-08 | 比亚迪股份有限公司 | Motor cooling assembly and electric automobile with the same |
| JP2016144270A (en) * | 2015-01-30 | 2016-08-08 | 株式会社クボタ | Cooling structure of rotary electric machine |
| JP2018133898A (en) * | 2017-02-15 | 2018-08-23 | 三菱自動車工業株式会社 | Refrigerant passage structure of motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021126000A (en) | 2021-08-30 |
| CN115053434A (en) | 2022-09-13 |
| JP6885482B1 (en) | 2021-06-16 |
| WO2021157118A1 (en) | 2021-08-12 |
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