CN111697737A - New energy automobile motor - Google Patents
New energy automobile motor Download PDFInfo
- Publication number
- CN111697737A CN111697737A CN202010621306.4A CN202010621306A CN111697737A CN 111697737 A CN111697737 A CN 111697737A CN 202010621306 A CN202010621306 A CN 202010621306A CN 111697737 A CN111697737 A CN 111697737A
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- Prior art keywords
- water
- end cover
- new energy
- energy automobile
- shell
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000001816 cooling Methods 0.000 claims abstract description 54
- 230000017525 heat dissipation Effects 0.000 claims abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 claims description 26
- 230000000694 effects Effects 0.000 abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 239000000498 cooling water Substances 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- 238000005266 casting Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
Abstract
The invention relates to the technical field of automobile motors, in particular to a new energy automobile motor which comprises a cylindrical water-cooling shell, wherein two ends of the water-cooling shell are connected with end covers, the end covers are provided with end cover radiating grooves, a plurality of annular water channels are arranged in the water-cooling shell, the water channels are communicated with a water inlet pipe and a water outlet pipe, and the water passing area of the water channels can be adjusted by adjusting the width of the water channels; and a shell radiating groove is formed in the outer part of the water cooling shell. The invention can solve the problems of poor cooling effect of the motor and inconvenience in heat dissipation and transportation in the prior art.
Description
Technical Field
The invention relates to the technical field of automobile motors, in particular to a new energy automobile motor.
Background
The motor of the electric/hybrid electric vehicle generates a large amount of heat in the working process, the temperature of an engine or a gearbox connected around the motor is also high, and the heat on the motor is transferred to the motor, so that the temperature of the motor is further increased, the performance and the efficiency of the motor are seriously affected, and the motor needs to be radiated.
In the prior art, a water cooling system is mostly adopted to cool the motor, a copper pipe is additionally arranged in a water cooling shell of the motor, cooling water is injected into the copper pipe, and the cooling water circulates in the water cooling shell along the copper pipe, so that the cooling of the motor is realized. This kind of cooling system, the pre-buried copper pipe of needs during the preparation, and the copper pipe still need install the shell additional after accomplishing additional, and not only processing is troublesome, and leads to motor casing thickness owing to installed the shell additional, and the radiating effect is not good, and the transportation of also being inconvenient for. In addition, due to the limitation of the motor size (the size is too large, heat dissipation and transportation are not easy, and the influence on work is caused), the diameter of the copper pipe is very small, the water inflow of cooling water is small, and the cooling effect is poor.
Disclosure of Invention
The invention aims to provide a new energy automobile motor to solve the problems that the motor in the prior art is poor in cooling effect and inconvenient to dissipate heat and transport.
In order to achieve the purpose, the invention provides the following technical scheme:
a new energy automobile motor comprises a cylindrical water-cooling shell, wherein end covers are connected to two ends of the water-cooling shell, end cover radiating grooves are formed in the end covers, a plurality of annular water channels are formed in the water-cooling shell, the water channels are communicated with a water inlet pipe and a water outlet pipe, and the water passing area of the water channels can be adjusted by adjusting the width of the water channels; and a shell radiating groove is formed in the outer part of the water cooling shell.
The principle and the beneficial effect of the scheme are as follows:
the water course is used for supplying the cooling water to flow, and the inlet tube is used for pouring into the cooling water into the water course, and the outlet pipe is used for discharging the cooling water in the water course, makes the cooling water at this internal loop of casing from this, takes away the heat of motor through the cooling water, realizes the cooling heat dissipation of motor. Under the condition that sets up annular water course, the thickness that adopts the water-cooling casing of tube-shape can the at utmost reduce the water-cooling casing to reduce the weight and the volume of water-cooling casing, be convenient for dispel the heat and transport.
In order to increase water flow, a plurality of copper pipes are usually additionally arranged in the prior art, so that a plurality of pipe orifices are reserved in the water-cooling shell, the conversion seat is additionally arranged to be connected when the water-cooling shell is externally connected with cooling water pipes (only two pipe orifices are usually arranged), water leakage is easy to occur at the conversion seat after long-term use, and the cooling effect of the motor is influenced.
This scheme changes original mode of installing the copper pipe additional into the mode of direct casting water course, and not only processing is convenient, and the width that this scheme accessible enlarges the water course increases logical water area, then need not to reserve a plurality of mouths of pipe, makes things convenient for external condenser tube, the condition of leaking can not appear yet. Compared with a water channel with a circular cross section, the water-cooling shell has the advantages that the thickness of the water-cooling shell is not increased while the water passing area of the water channel is enlarged (the water channel with the circular cross section needs to be integrally enlarged on the periphery when the water passing area is enlarged), so that the thickness of the water-cooling shell is effectively reduced, and heat dissipation and transportation are facilitated. And meanwhile, the shell radiating grooves are formed in the outer part of the water-cooling shell, so that the radiating effect can be improved, the weight reduction effect can be achieved, and the transportation is more convenient.
Furthermore, the end cover comprises an AS end cover and a BS end cover, the AS end cover is concave, the BS end cover is convex, one end of the rotor of the motor, which is connected with the output shaft, is connected with the concave part of the AS end cover, and the other end of the rotor is connected with the convex part of the BS end cover.
Has the advantages that: so set up, the structure of motor is compacter, and the volume is littleer, the transportation of being convenient for more.
Furthermore, the end cover radiating grooves comprise an outer radiating groove and an inner radiating groove, the outer radiating groove and the inner radiating groove are arranged on two sides of the AS end cover concave part, and the inner radiating groove is arranged on two sides of the BS end cover convex part.
Has the advantages that: the AS end cover is provided with the outer heat dissipation groove and the inner heat dissipation groove, so that the heat dissipation effect is good; the BS end cover is in a convex shape, after the protruding part of the BS end cover is connected with the end part of the rotor, the protruding part can be used as a heat dissipation groove to dissipate heat, and then the inner heat dissipation groove is arranged on the protruding part, so that the heat dissipation effect is better; the heat dissipation grooves are formed in the AS end cover and the BS end cover, so that the heat dissipation effect of the motor can be improved, the weight of the motor can be reduced to a certain degree, and the transportation is more convenient.
Furthermore, the radiating grooves of the shell are rectangular and are uniformly distributed on the water-cooled shell.
Has the advantages that: the radiating grooves of the shell are uniformly distributed on the water-cooled shell, so that the radiating effect is better.
Further, the AS end cover and the BS end cover can be detachably connected to the water-cooling shell.
Has the advantages that: so convenient dismantlement to overhaul.
Furthermore, a junction box is connected to the BS end cover, and a feedback element interface and a plurality of power line interfaces are arranged on the junction box.
Has the advantages that: the junction box is used for wiring, the feedback element interface is used for connecting a feedback element, and the power line interface is used for connecting a power line; the terminal box is installed at the end of motor, compares and sets up in the side, can reduce the abrupt sense that the terminal box brought, and whole more harmonious.
Further, the junction box comprises a top plate, a bottom plate and a side plate connected between the top plate and the bottom plate, the side plate comprises an arc section and a flat section, the power line interface is arranged on the flat section, and the feedback element interface is arranged on the arc section.
Has the advantages that: in this scheme, the curb plate of terminal box sets up the circular arc section, with the water-cooled casing cooperation of tube-shape, whole harmony is better, further improves the pleasing to the eye degree of motor.
Furthermore, a plurality of additional mounting holes are formed in the AS end cover, a plurality of connecting columns are fixed on the outer wall of the water-cooling shell, a plurality of connecting holes are formed in the connecting columns, and the connecting holes are used for being connected with a support of the vehicle speed reducer.
Has the advantages that: in the prior art, the motor is connected with the speed reducer after being fixed on the frame, and the speed reducer is also installed on the frame, and when jolting in the vehicle operation, the motor can receive the effort of speed reducer on the one hand, and on the other hand still can receive the pulling force of frame, and the motor jolts asynchronously with the speed reducer, leads to the output shaft fragile of motor or even takes place disconnected axle. In this scheme, install the hole additional and be used for the flange plate, then be connected through the speed reducer of ring flange and car, the connecting hole is used for connecting screw to fix the motor on the support of speed reducer. The motor is connected with the support of the speed reducer but not directly connected with the frame, so that the bumping of the motor and the speed reducer is synchronous, and the conditions that the output shaft of the motor is damaged and the shaft is broken are effectively avoided.
Further, the cross section of each water channel is rectangular, the water channels are arranged in parallel, two adjacent water channels are communicated, the communicated positions are staggered, and the distance between every two adjacent water channels is 3-7 mm.
Has the advantages that: for the spiral water channel, during actual processing, parts such as a pipeline and the like need to be bent into a spiral shape, and then the spiral water channel is placed in a mould for casting, so that the processing is troublesome; in addition, because of the limitation of the included angle between each circle of the spiral, the distance between the circles of the spiral structure cannot be reduced well, and therefore the distance between the formed water channels is larger. And the water course in this scheme is parallel to each other, communicates between the adjacent water course, add man-hour direct casting can, need not to install the part additional, compare spiral water course, it is more convenient to process. In addition, because not being restricted by spiral contained angle, the distance between the adjacent water course can effectually reduce, can arrange more water courses, and the water yield of cooling water then can increase, and the cooling effect is better.
Further, the width of the water channel is 18-22 mm, and the thickness of the water channel is 3-5 mm.
Has the advantages that: when the width and the thickness of the water channel are in the range, the water passing area of the water channel is ideal, and the cooling effect of the motor is good.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a first embodiment of the present invention;
FIG. 2 is a right side view of a first embodiment of the present invention;
FIG. 3 is a schematic side view of the first embodiment of the present invention;
FIG. 4 is a left side view of the first embodiment of the present invention;
FIG. 5 is a cross-sectional view of a water-cooled enclosure according to an embodiment of the invention;
fig. 6 is a schematic side view of a fourth embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the water cooling device comprises a water outlet pipe seat 1, a power line interface 2, a straight section 3, a junction box 4, an arc section 5, a water cooling machine shell 6, a BS end cover 7, an output shaft 8, a water inlet pipe seat 9, a connecting column 10, an AS end cover 11, an additional mounting hole 14, a water channel 15, an inner heat dissipation groove 16, an outer heat dissipation groove 17, a dovetail groove 18 and a fixing frame 19.
Example one
AS shown in fig. 1 and 2, the motor shell structure of the new energy automobile comprises a shell body, wherein the shell body comprises a cylindrical water-cooling machine shell 6, the left end of the water-cooling machine shell 6 is connected with an AS end cover 11 through a screw, and the right end of the water-cooling machine shell 6 is connected with a BS end cover 7 through a screw. A plurality of rectangular casing heat dissipation grooves (not shown in the figure) are integrally formed on the outer wall of the water-cooling casing 6, and the casing heat dissipation grooves are annularly arrayed on the water-cooling casing 6.
AS shown in fig. 1, the AS end cap 11 is concave, the BS end cap 7 is convex, the left end of the rotor of the motor is rotatably connected with the concave of the AS end cap 11, and the right end of the rotor is connected with the convex of the BS end cap 7. Inner radiating grooves 16 are symmetrically formed in the inner walls of the two sides of the concave part of the AS end cover 11, outer radiating grooves 17 are symmetrically formed in the outer wall of the concave part of the AS end cover 11, and inner radiating grooves 16 are symmetrically formed in the two sides of the convex part of the BS end cover 7.
The BS end cover 7 is provided with a junction box 4, the junction box 4 comprises a top plate, a bottom plate and a side plate which is integrally formed or welded between the top plate and the bottom plate, and the bottom plate is fixed on the BS end cover 7 through screws. As can be seen from fig. 2, the side plate of the junction box 4 includes an arc section and a flat section 3, a feedback element interface is installed on the arc section of the side plate, a plurality of power line interfaces 2 are installed on the flat section 3, the number of the power line interfaces 2 in this embodiment is three, and the three power line interfaces 2 are uniformly distributed on the flat section 3.
AS can be seen from fig. 4, the AS end cover 11 is provided with a plurality of mounting holes 14 for connecting to a flange, and is connected to a speed reducer of a vehicle through the flange. As can be seen from fig. 3, the outer wall of the water-cooling housing 6 is welded with a plurality of connecting columns 10, in this embodiment, the number of the connecting columns 10 is three, and the three connecting columns 10 are distributed in a triangular shape. Each connecting column 10 is provided with a connecting hole, the connecting holes are screw holes in the embodiment, and the connecting holes are used for being connected with a support of the speed reducer.
As shown in fig. 1, a plurality of annular water channels 15 are formed inside the water-cooled casing 6, the water channels 15 are formed by casting, the number of the water channels 15 is four in the embodiment, and the four water channels 15 have the same diameter and are concentrically arranged. As can be seen from fig. 5, the four water channels 15 are arranged in parallel, and the distances between two adjacent water channels 15 are equal, specifically, the distance between two adjacent water channels 15 is 5 mm. Two adjacent water channels 15 are communicated with each other, and only one communication site is arranged in a staggered mode. The cross section of each water channel 15 is rectangular, and the width and the thickness of each water channel 15 are respectively 20 mm and 4 mm. As can be seen from fig. 3, the water-cooling housing 6 is integrally formed with two water pipe seats, the two water pipe seats are connected with two water pipes through internal threads, the left water pipe is a water inlet pipe seat 9, the right water pipe seat 1 is a water outlet pipe seat, the water inlet pipe seat 9 and the water outlet pipe seat 1 are both communicated with the water channel 15, and the water inlet pipe seat 9 and the water outlet pipe seat 1 are respectively used for installing a water inlet pipe and a water outlet pipe.
In this embodiment, directly form water course 15 on water-cooling casing 6 through the casting, compare and install the copper pipe additional in the casing, the direct casting of water-cooling casing 6 of this scheme forms, has saved and has installed the copper pipe additional, at steps such as copper pipe additional installation shell, it is more convenient to process. And because the shell is not additionally arranged, the thickness of the shell of the motor is greatly reduced, and the heat dissipation and transportation of the motor are facilitated.
The water channel 15 with the rectangular cross section is adopted, and compared with the circular water channel 15, the water passing area of the water channel 15 can be increased by widening the width of the water channel 15, so that the water passing amount is increased, the thickness of the water cooling shell 6 does not need to be increased, the thinner thickness of the water cooling shell 6 is ensured, and heat dissipation is facilitated. Meanwhile, the size of the motor is reduced, and the transportation is convenient.
Adopt the water course 15 that is parallel to each other, it is more convenient to compare 15 processing of spiral water course, and can effectually reduce the interval between the water course 15 to set up more water courses 15, and then improve the water yield of cooling water, the cooling effect is better: the spiral water channel 15 needs to be additionally provided with a spiral mold during casting, and due to the limitation of the included angle between each circle of the spiral shape, the distance between every two adjacent circles cannot be reduced well, so that the number of the water channels 15 is limited, and the cooling effect is poor.
In practical application, the flange plate is connected through the additional mounting hole 14 on the AS end cover 11, the flange plate is connected with the speed reducer on a vehicle, and then the motor and the speed reducer are connected together through the connecting screw between the connecting hole on the water-cooling shell 6 and the bracket of the speed reducer. The bumping synchronization of the motor and the speed reducer can be realized during the running of the vehicle, so that the condition that the output shaft 8 of the motor is damaged or even broken due to the fact that the motor and the speed reducer are asynchronous is avoided.
The junction box 4 is used for wiring, the power line interface 2 is used for connecting a power line, and the feedback element interface is used for connecting a feedback element. The junction box 4 in the embodiment is designed into the shape shown in fig. 2, and is matched with the overall cylindrical motor, so that the overall harmony is better, and the attractiveness is higher.
Example two
The difference between the embodiment and the first embodiment is that the distance between the adjacent water channels 15 is 3 mm, the width of each water channel 15 is 18 mm, and the thickness of each water channel is 3 mm.
EXAMPLE III
The difference between the embodiment and the first embodiment is that the distance between the adjacent water channels 15 is 7 mm, the width of each water channel 15 is 22 mm, and the thickness of each water channel is 5 mm.
Example four
As shown in fig. 6, the difference between the first embodiment and the second embodiment is that a triangular fixing frame 19 is welded on the outer wall of the water-cooling enclosure 6, a dovetail groove 18 is formed on the fixing frame 19, the dovetail grooves 18 are connected end to form a triangle, and as shown in fig. 6, the three connecting columns 10 are slidably connected in the dovetail groove 18.
The top end of the connecting column 10 is hinged with a lifting hook (not shown in the figure), and the lifting hook can be hooked on a bracket of the speed reducer. The bottom end of the connecting column 10 is integrally formed with a circular limiting plate, the circle center of the connecting column 10 coincides with the circle center of the limiting plate, and the diameter of the limiting plate is larger than the width of the dovetail groove 18 but smaller than the height of the inner space of the dovetail groove 18. The connection column 10 can be prevented from falling off by utilizing the limit plate to tightly abut against the dovetail groove 18.
When the motor is installed, the motor can be connected with the speed reducer bracket by screwing the screw between the bracket of the speed reducer and the connecting hole of the connecting column 10. Three spliced pole 10 sliding connection can adjust the position of three spliced pole 10 according to the specific size of speed reducer support during the use in the dovetail 18 of mount 19 for the motor can be connected with the speed reducer support of difference, and application range is wider.
The articulated lifting hook in spliced pole 10 top, during the installation motor, can be earlier with the lifting hook on the support of speed reducer, be connected motor and speed reducer, then need not the manual work in the installation and lift the motor, it is more convenient to install.
With the lifting hook on spliced pole 10 on the support of speed reducer, still be convenient for align the connecting hole on spliced pole 10 with the connecting hole on the speed reducer support, compare the manual work and lift the motor and aim at the connecting hole, it is more convenient to operate, installs more laborsavingly.
Because the diameter of the limiting plate is less than the internal height of the dovetail groove 18, the limiting plate can rotate in the dovetail groove 18, when the connecting column 10 is not used, the connecting column 10 can rotate along the length direction of the dovetail groove 18, the connecting column 10 is clamped into the dovetail groove 18, and therefore the connecting column 10 is stored.
After the connecting column 10 is accommodated in the dovetail groove 18, the surface of the fixing frame 19 is flat, so that the fixing frame 19 can be used as a support frame for the motor to place the motor, the motor is placed more stably, and the motor is convenient to store and transport.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides a new energy automobile motor, includes the water-cooling casing of tube-shape, and water-cooling casing both ends are connected with end cover, its characterized in that: the end cover is provided with an end cover heat dissipation groove, a plurality of annular water channels are arranged in the water cooling shell, the water channels are communicated with a water inlet pipe and a water outlet pipe, and the water passing area of the water channels can be adjusted by adjusting the width of the water channels; and a shell radiating groove is formed in the outer part of the water cooling shell.
2. The new energy automobile motor according to claim 1, characterized in that: the end cover comprises an AS end cover and a BS end cover, the AS end cover is concave, the BS end cover is convex, one end of the motor, which is connected with the output shaft, is connected with the concave part of the AS end cover, and the other end of the motor is connected with the convex part of the BS end cover.
3. The new energy automobile motor according to claim 2, characterized in that: the end cover radiating grooves comprise outer radiating grooves and inner radiating grooves, the outer radiating grooves and the inner radiating grooves are arranged on two sides of the AS end cover concave part, and the inner radiating grooves are arranged on two sides of the BS end cover convex part.
4. The new energy automobile motor according to claim 3, characterized in that: the radiating grooves of the shell are rectangular and are uniformly distributed on the water-cooled shell.
5. The new energy automobile motor according to claim 4, characterized in that: the AS end cover and the BS end cover can be detachably connected to the water-cooling shell.
6. The new energy automobile motor according to claim 2, characterized in that: the BS end cover is connected with a junction box, and the junction box is provided with a feedback element interface and a plurality of power line interfaces.
7. The new energy automobile motor according to claim 6, characterized in that: the junction box comprises a top plate, a bottom plate and a side plate connected between the top plate and the bottom plate, the side plate comprises an arc section and a straight section, the power line interface is arranged on the straight section, and the feedback element interface is arranged on the arc section.
8. The new energy automobile motor according to claim 2, characterized in that: a plurality of additional mounting holes are formed in the AS end cover, a plurality of connecting columns are fixed on the outer wall of the water-cooling shell, a plurality of connecting holes are formed in the connecting columns, and the connecting holes are used for being connected with a support of a vehicle speed reducer.
9. The new energy automobile motor according to any one of claims 1 to 8, characterized in that: the cross section of the water channels is rectangular, the water channels are arranged in parallel, two adjacent water channels are communicated, the communicated positions are staggered, and the distance between every two adjacent water channels is 3-7 mm.
10. The new energy automobile motor according to claim 9, characterized in that: the width of the water channel is 18-22 mm, and the thickness of the water channel is 3-5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621306.4A CN111697737A (en) | 2020-06-30 | 2020-06-30 | New energy automobile motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621306.4A CN111697737A (en) | 2020-06-30 | 2020-06-30 | New energy automobile motor |
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| CN209150873U (en) * | 2018-12-04 | 2019-07-23 | 宁波菲仕运动控制技术有限公司 | A kind of monoblock type reversible passage fluid-cooled electrical machine shell |
| CN209104940U (en) * | 2018-12-05 | 2019-07-12 | 北京超同步伺服股份有限公司 | Motor water jacket and water-cooled machine with the motor water jacket |
| CN210273697U (en) * | 2019-08-29 | 2020-04-07 | 东风汽车集团有限公司 | New forms of energy water-cooling motor casing and water-cooling motor of integrated front end housing |
| CN210469052U (en) * | 2019-11-13 | 2020-05-05 | 重庆虬龙科技有限公司 | Water-cooled motor structure |
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Application publication date: 20200922 |