CN111697743A

CN111697743A - Dual cooling assembly

Info

Publication number: CN111697743A
Application number: CN202010541282.1A
Authority: CN
Inventors: 韩永杰; 刘钧; 冯颖盈
Original assignee: Shanghai Weimeisi New Energy Co ltd
Current assignee: Shanghai Weimeisi New Energy Co ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2020-09-22

Abstract

The invention discloses a double-cooling assembly, which comprises a motor shell, a filter, a motor rotating shaft, a speed reducer, an oil pump and a water cooling channel, and also comprises: the oil pump conveys cooling oil in the speed reducer to the first oil cooling channel; a second oil cooling channel; an oil return passage. The oil pump is a mechanical oil pump, and the mechanical oil pump is arranged in the speed reducer and is in transmission connection with a motor rotating shaft; one end of the motor shell is provided with an end cover, and the end cover comprises a connecting channel for communicating the first oil cooling channel and the second oil cooling channel; the first oil cooling channel comprises an oil injection structure which is an oil injection hole or an oil injection pipe, and the second oil cooling channel comprises an oil injection hole; the surface of the motor shell is also provided with fins. Compared with the prior art, the heat dissipation performance of the driving assembly is greatly improved; and the assembly has lower cost and smaller volume.

Description

Dual cooling assembly

Technical Field

The invention relates to the field of power assembly heat dissipation, in particular to a double-cooling assembly.

Background

With the technological progress, the market demands higher and higher performance and integration of electric drive assemblies, wherein cooling is always a difficult point limiting the relevant performance and volume indexes of the assemblies. In the existing electric drive assembly, a drive motor is taken as a key component for mutually converting electric energy and mechanical energy, the conversion efficiency and the working reliability and stability of the drive motor are key points of technical attack in the industry, when the motor works, the resistance is increased along with the rise of the temperature, the loss of the motor is increased, the efficiency is reduced, meanwhile, the requirements of overhigh temperature on an insulating material, the temperature-resistant grade of a winding and a bearing are improved, the integral cost is higher, and the product popularization is not facilitated; when the temperature of the speed reducer is raised to a certain degree, the performance of lubricating oil is reduced, the contact abrasion is increased, the rigidity of the shaft is reduced, and the concentricity of the shaft is also reduced; more seriously, the bearing burns the gear, so that the driving motor can stably work under various severe working conditions, and the heat dissipation is a serious problem.

The cooling method of the motor is usually that a water channel and a water inlet and a water outlet communicated with the cooling water channel are arranged on a shell, water flow takes away heat through the cooling water channel in the shell, but the cooling effect of the motor is poor, and heat generated by a coil winding and magnetic steel is not easy to transfer to the shell due to the problems of distance and insulating medium, so that the heat dissipation performance is poor; the oil cooling common mode is to pour into the inside cavity of motor with the cooling oil through heat dissipation channel, has to spray at stator tip or bearing department through the pipeline, throws to stator tip or bearing position through the high-speed rotation of rotor, generally still must join in marriage the heat exchanger of certain power in the cold scheme of current oil to the cooling oil needs extra power drive, can't borrow the water pump of whole car, leads to increase cost and system complexity. Therefore, it is necessary to design a driving assembly with high heat dissipation efficiency without increasing the volume and reducing the cost of the driving assembly.

Disclosure of Invention

To solve the above problems, the present invention provides a dual cooling assembly.

The technical scheme provided by the invention is as follows: the utility model provides a two cooling assemblies, includes motor housing, motor shaft, reduction gear, oil pump and locates water-cooling channel on the motor housing still includes: the oil pump is connected with the speed reducer and the first oil cooling channel so as to convey cooling oil in the speed reducer to the first oil cooling channel; the second oil cooling channel is communicated with the first oil cooling channel and is arranged on the motor rotating shaft and faces the interior of the motor shell to spray oil; and the oil return channel is communicated with the inside of the motor shell and the speed reducer.

Further, the oil pump is a mechanical oil pump, and the mechanical oil pump is arranged in the speed reducer and is in transmission connection with the motor rotating shaft.

Furthermore, one end of the first oil cooling channel is communicated with the oil pump through a first pipeline, and the other end of the first oil cooling channel is communicated with the second oil cooling channel.

Further, the second oil cooling channel is coaxially arranged with the motor rotating shaft, an end cover is arranged at one end of the motor shell and comprises a connecting channel communicated with the other end of the first oil cooling channel and the second oil cooling channel.

Further, the double-cooling assembly further comprises a winding arranged inside the motor shell, and the first oil cooling channel comprises at least two groups of oil injection structures respectively arranged at two ends of the winding.

Further, the oil injection structure is an oil injection hole or an oil injection pipe.

Further, the cooling assembly further comprises a rotor arranged inside the motor shell, a bearing is further sleeved on the motor rotating shaft, and the second oil cooling channel comprises at least one group of oil injection holes facing the rotor and/or the bearing.

Further, the oil return passage is arranged at the bottom of the motor shell, and at least one oil return opening communicated with the oil return passage is further formed in the bottom of the motor shell.

Further, the cooling assembly further comprises a filter arranged in the speed reducer, and the filter is arranged at the communication position of the speed reducer and the oil return channel.

Furthermore, the surface of the motor shell is also provided with fins.

Compared with the prior art, the oil pump in the invention conveys cooling oil in the speed reducer to the first oil cooling channel and the water cooling channel to exchange heat in the motor shell so as to cool, the second oil cooling channel is communicated with the first oil cooling channel, the cooling oil in the first oil cooling channel is sprayed inwards from the motor shell, and the cooling oil in the second oil cooling channel is sprayed outwards from the rotating shaft of the motor, so that all parts in the motor can be contacted with the cooling oil, and then the cooling oil flows away from the oil return channel and takes away heat in the motor, thereby greatly improving the heat dissipation performance of the driving assembly; and the assembly has lower cost and smaller volume.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a perspective view of a dual cooling assembly in accordance with an embodiment of the present invention;

FIG. 2 is a schematic block diagram of the structure of the oil pump and the motor of the dual cooling assembly in one embodiment of the present invention;

FIG. 3 is a schematic, partially cross-sectional, schematic illustration of a dual cooling assembly in accordance with an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a motor housing of a dual cooling assembly in accordance with an embodiment of the present invention;

FIG. 5 is a schematic diagram of the structure of the oil spray pipe of the dual cooling assembly according to one embodiment of the present invention;

FIG. 6 is a cross-sectional view of a motor shaft of a dual cooling assembly in accordance with an embodiment of the present invention;

FIG. 7 is a schematic cooling flow diagram of a first embodiment of a dual cooling assembly of the present invention;

FIG. 8 is a schematic cooling flow diagram of a second embodiment of a dual cooling assembly of the present invention;

FIG. 9 is a schematic cooling flow diagram of a third embodiment of a dual cooling assembly of the present invention;

FIG. 10 is a cooling flow diagram of a fourth embodiment of a dual cooling assembly of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.

The invention provides a double-cooling assembly, which mainly comprises a motor 1 and a speed reducer 2 in transmission connection with an output shaft of the motor 1, as shown in figure 1.

Specifically, as shown in fig. 2 and 3, the motor 1 includes a cylindrical motor housing 11, a winding 12 installed in the motor housing 11, a rotor 13 with a gap fitted in the winding 12, and a motor shaft 14 installed in the rotor 13, which are sequentially arranged from an outer layer to an inner layer, and the motor shaft 14 is assembled with the motor housing 11 through a bearing; the motor is cooled by the two cooling flow paths, so that the heat dissipation performance of the assembly is greatly enhanced.

Further, two cooling flow paths include a water cooling channel 3 and an oil cooling channel 4.

As shown in fig. 4, the water-cooling channel 3 is disposed in the outer wall of the motor housing 11, specifically, a hollow flow channel is disposed in the wall, and two openings communicated with the cooling water pipe are further disposed on the outer wall, wherein one of the openings is a water inlet of the water-cooling channel 3, and the other opening is a water outlet of the water-cooling channel, and the water-cooling channel 3 flows through the motor housing 11 to take away heat in the motor 1; meanwhile, the water cooling channel 3 may be disposed on the surface of the housing of the decelerator 2 to dissipate heat of the decelerator 2.

The water cooling channel 3 is connected with a cooling water circulation system through a cooling water pipe, and cold water is cooled in the cooling water circulation system and then flows into the motor shell 11 for heat exchange and temperature rise, so that the heat of the motor is taken away in a circulating mode in sequence; the cooling water circulation system comprises a heat exchanger, cooling water is cooled in the heat exchanger, the heat exchanger can be integrated in a motor controller A (shown in detail in figures 7 to 10), cooling water can be cooled, the whole assembly system can be refined, and the size is reduced

As shown in fig. 3, the oil-cooling passage 4 mainly includes a first oil-cooling passage 41 and a second oil-cooling passage 42.

The first oil cooling channel 41 is also arranged in the outer wall of the motor shell 11, an opening communicated with the first oil cooling channel 41 is formed in the left end of the motor shell 11, the left end opening is communicated with the oil pump 5 through the first pipeline 411, lubricating oil in the speed reducer 2 is sent into the first oil cooling channel 41 through the left end opening by the oil pump 5, at least one group of oil injection structures are further arranged on the inner side of the motor shell 11 and communicated with the first oil cooling channel 41, and the oil injection structures spray cooling oil towards the winding 12 under the action of the oil pump so as to cool each structure of the motor mainly comprising the winding 12.

Preferably, as shown in fig. 5, the oil injection structure may be an oil injection hole 412 or an oil injection pipe 413, and when the oil injection structure is provided with multiple groups, the oil injection hole 412 and the oil injection pipe 413 may be used together; wherein spout oil pipe 413 and be curved pipeline, at the middle part of spouting oil pipe 413 and the switch-on of first oil cooling passageway 41, spout the both ends of oil pipe 413 and have the opening for the cooling oil can be sprayed under the drainage effect of spouting oil pipe 413 and dispel the heat to the position such as winding.

As shown in fig. 6, the second oil cooling passage 42 is disposed in the middle of the motor shaft 14, the second oil cooling passage 42 penetrates through two ends of the motor shaft 14 and is disposed coaxially with the motor shaft 14, at least one set of oil spray holes 412 is disposed on the circumferential surface of the motor shaft 14, each set of oil spray holes 412 includes at least one oil spray hole 412 distributed along the circumference of the motor shaft 14, so that when the motor shaft 14 rotates, the cooling oil can be thrown out of the oil spray holes 412 by its own centrifugal action, and the cooling oil is sputtered to the rotor 13, the bearing, and other parts to cool the motor structure including the rotor 13 and the bearing.

In addition, the first oil cooling channel 41 and the second oil cooling channel 42 in this embodiment are communicated with each other, and the specific communication structure thereof is as follows: an opening communicated with the first oil cooling channel 41 is also formed in the right end of the motor shell 11, the motor 1 with the opening in the right end further comprises end covers 16 arranged at two ends of the motor shell 11, a connecting channel 161 communicated with the opening in the right end is arranged inside the end cover 16 at the right end of the motor shell 11, the middle of each end cover 16 comprises an extension part 162 extending into the motor rotating shaft 14, the size of each extension part 162 is matched with the second oil cooling channel 42 so as to block a right end outlet of the second oil cooling channel 42, the connecting channel 161 further comprises an end opening extending into the second oil cooling channel 42 in the extension part 162, and therefore the first oil cooling channel 41 is communicated with the second oil cooling channel 42.

Further, an oil return passage 17 is further provided inside the motor housing 11, the oil return passage 17 is disposed inside the motor housing 11 like the first oil cooling passage 41 and the water cooling passage, the oil return passage 17 is particularly disposed at the bottom of the motor housing 11, and at least one oil return port 171 communicating with the oil return passage 17 is further provided at the bottom of the inside of the motor housing 11, so that the cooling oil sprayed from the first oil cooling passage 41 and the second oil cooling passage 42 can flow back to the oil return passage 17 under the action of gravity, and the left end of the oil return passage 17 is communicated to the inside of the speed reducer 2 through a second pipeline 172 (the cooling oil returns to the inside of the speed reducer 2 and has the function of lubricating oil at the same time).

Therefore, the cooling oil of the whole assembly forms a circulation loop, the cooling oil flows into the first oil cooling channel 41 from the speed reducer through the oil pump 5, the first oil cooling channel 41 and the water cooling channel 3 exchange heat in the motor shell 11, the temperature of the cooling oil is reduced, the cooled cooling oil flows into the second oil cooling channel 42, then the cooling oil is sprayed onto the winding 12 from the first oil cooling channel 41 and sprayed onto the bearing and/or the rotor from the second oil cooling channel 42, so that the cooling oil can cover all parts in the motor in time, and each part exchanges heat with the cooling oil when the temperature of the cooling oil is the lowest as far as possible, compared with the arrangement of spraying oil from only one position, the heat dissipation performance of the assembly is extremely remarkable, and the working performance of the assembly can be fully ensured; meanwhile, the water cooling channel 3 cools the motor shell 11 and is matched with the oil cooling channel to simultaneously dissipate heat of all parts of the motor and quickly cool the assembly.

Preferably, the first oil cooling channel 41 in the present application has two sets of oil injection structures, which are respectively located at the left and right ends of the winding, so that the contact range of the winding 12 and the cooling oil is larger, and simultaneously, the whole winding 12 is covered more quickly, and the effect of quickly cooling the winding can be achieved.

Preferably, second oil-cooling channel 42 in this application also has two sets ofly, and it sets up corresponding to bearing and rotor 13 respectively for the cooling oil can cool off both simultaneously, and the cooling effect is showing, has promoted heat dispersion.

Further, in other embodiments, a fin-shaped reinforcing rib may be additionally disposed on the outer side of the motor housing 11 to increase the strength of the motor housing 11, so that the outer wall of the motor housing 11 may be made thinner, and the contact area between the motor housing 11 and the environment is increased, thereby further increasing the heat exchange performance of the assembly.

Preferably, the oil pump 5 in the present invention is a mechanical oil pump, and the mechanical oil pump is integrally arranged inside the speed reducer 2; mechanical oil pump mainly includes casing and drive mechanism, the casing adopts the metal material to form the cavity, drive mechanism sets up inside the cavity, drive mechanism mainly includes the meshing gear, 2 inside a plurality of transmission shafts and the meshing gear of having of reduction gear, drive mechanism in the mechanical oil pump in this application with through transmission shaft or meshing gear and motor shaft 14 transmission in reduction gear 2 be connected, provide power for mechanical oil pump when by motor shaft 14 pivoted, thereby make the structure of whole assembly more retrench, cost and space have been practiced thrift.

Furthermore, in order to ensure the purity of the cooling oil returning to the retarder 2, a filter 21 is provided inside the retarder 2, in particular inside the retarder 2 in communication with the second line 172.

As shown in fig. 7, in the first embodiment, the speed reducer 2 includes a housing B1, an input shaft B2 coaxially connected with the motor rotating shaft 14 through a coupling, a middle shaft B3 parallel to the input shaft B2, and an output shaft B4 parallel to the middle shaft B3, wherein the input shaft B2, the middle shaft B3 and the output shaft B4 are all in transmission through gear engagement; in this embodiment, the transmission mechanism of the oil pump 5 is engaged with the gear on the intermediate shaft B3 to obtain power.

As shown in fig. 8, in the second embodiment, gears in the oil pump 5 may also be directly mounted on the intermediate shaft B3 to obtain power.

As shown in fig. 9, in the third embodiment, the transmission mechanism of the oil pump 5 may be engaged with the gear on the output shaft B4 to obtain power.

As shown in fig. 10, in the fourth embodiment, a gear in the oil pump 5 may also be directly mounted on the output shaft B4 to obtain power.

It should be noted that the above-mentioned embodiments are only part of countless possible embodiments, and those skilled in the art can design various specific implementation structures according to the internal structure of the speed reducer 2, but it is covered by the present application no matter which shaft of the speed reducer the transmission mechanism of the oil pump 5 is in transmission connection with, or how the housing is arranged according to the connection manner of the transmission mechanism.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a two cooling assemblies, includes motor housing, motor shaft, reduction gear, oil pump and locates water-cooling channel on the motor housing, its characterized in that still includes:

the oil pump is connected with the speed reducer and the first oil cooling channel so as to convey cooling oil in the speed reducer to the first oil cooling channel;

the second oil cooling channel is communicated with the first oil cooling channel and is arranged on the motor rotating shaft and faces the interior of the motor shell to spray oil;

and the oil return channel is communicated with the inside of the motor shell and the speed reducer.

2. A dual cooling assembly as set forth in claim 1 wherein said oil pump is a mechanical oil pump disposed within said speed reducer and drivingly connected to said motor shaft.

3. The dual cooling assembly of claim 1 or 2, wherein one end of the first oil cooling passage communicates with the oil pump through a first pipe, and the other end communicates with the second oil cooling passage.

4. The dual cooling assembly of claim 3, wherein the second oil cooling channel is coaxially disposed with the rotating shaft of the motor, and an end cover is disposed at one end of the motor casing, and the end cover includes a connecting channel for connecting the other end of the first oil cooling channel and the second oil cooling channel.

5. The dual cooling assembly of claim 1, further comprising a winding disposed inside the motor housing, wherein the first oil cooling channel comprises at least two sets of oil injection structures disposed at two ends of the winding, respectively.

6. The dual cooling assembly of claim 5, wherein the oil injection feature is an oil injection hole or an oil injection tube.

7. The dual cooling assembly of claim 1, further comprising a rotor disposed inside the motor housing, wherein a bearing is further sleeved on the motor shaft, and the second oil cooling passage comprises at least one set of oil injection holes disposed toward the rotor and/or the bearing.

8. The dual cooling assembly of claim 1, wherein the oil return passage is disposed at a bottom of the motor housing, the bottom of the motor housing further having at least one oil return port in communication with the oil return passage.

9. The dual cooling assembly of claim 1, further comprising a filter disposed within the retarder, the filter being disposed at a communication of the retarder with an oil return passage.

10. The dual cooling assembly of claim 1, wherein the motor housing surface is further provided with fins.