CN115163803A

CN115163803A - Electric drive assembly lubrication cooling system and vehicle

Info

Publication number: CN115163803A
Application number: CN202210779787.0A
Authority: CN
Inventors: 安广林; 张和平; 王清晨; 涂鹏辉; 杨林; 阮鸥
Original assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2022-10-11

Abstract

The invention discloses an electric drive assembly lubricating and cooling system and a vehicle, wherein the electric drive assembly lubricating and cooling system comprises a motor assembly and a speed reducer assembly, the speed reducer assembly is connected with the motor assembly, a coarse filter and a differential mechanism are arranged in a speed reducer cavity, and a cooler is arranged on the outer wall of a speed reducer shell; the inlet of the cooler is communicated with the coarse filter through the liquid inlet channel, the outlet of the cooler is communicated with the rotor assembly through the rotor circulation channel, the outlet of the cooler is communicated with the stator assembly through the stator circulation channel, and the rotor assembly and the stator assembly are both communicated with the cavity of the speed reducer through the liquid return channel, so that cooling liquid in the cavity of the speed reducer flows through the stator assembly and the rotor assembly through the liquid inlet channel, the stator circulation channel and the rotor circulation channel and then flows back to the cavity of the speed reducer through the liquid return channel. The technical scheme of the invention improves the heat dissipation efficiency of the electric drive assembly.

Description

Electric drive assembly lubrication cooling system and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to an electric drive assembly lubricating and cooling system and a vehicle.

Background

With the continuous development of new energy vehicles, the energy consumption economy of electric vehicles is more and more targeted, which requires that electric drive systems need to continuously improve efficiency and reduce loss, and the design of electric drive systems with high power density, high performance and high efficiency becomes the focus of current research.

At present, the electric drive assembly with high power density, high performance and high efficiency is obtained by adopting a mode of improving the heat dissipation efficiency of the electric drive assembly. Therefore, it is becoming increasingly important how cooling of electric drive assemblies can be achieved.

Disclosure of Invention

The invention mainly aims to provide a lubricating and cooling system of an electric drive assembly, and aims to improve the heat dissipation efficiency of the electric drive assembly.

To achieve the above object, the present invention provides an electric drive assembly lubrication cooling system, comprising:

the motor assembly comprises a motor shell, a rotor assembly and a stator assembly, wherein the rotor assembly and the stator assembly are arranged in the motor shell; and

the speed reducer assembly is connected with the motor assembly and comprises a speed reducer shell, a speed reducer cavity is formed in the speed reducer shell, a coarse filter and a differential mechanism are arranged in the speed reducer cavity, the coarse filter is used for filtering cooling liquid in the speed reducer cavity, the differential mechanism is used for stirring and splashing the cooling liquid in the speed reducer cavity for lubrication, and a cooler is arranged on the outer wall of one end, far away from the motor assembly, of the speed reducer shell;

the entry of cooler through go into the liquid passageway with the strainer intercommunication, the export of cooler pass through rotor circulation passageway with the rotor assembly intercommunication, the export of cooler pass through stator circulation passageway with the stator assembly intercommunication, the rotor assembly with the stator assembly all through return the liquid passageway with the reduction gear cavity is linked together, so that coolant liquid in the reduction gear cavity passes through go into the liquid passageway the stator circulation passageway the rotor circulation passageway flows through the stator assembly with behind the rotor assembly, the rethread return the liquid passageway and flow back to the reduction gear cavity.

Optionally, a liquid receiving plate is arranged in the speed reducer cavity, the stator circulation channel is provided with a reserved hole, and the reserved hole is communicated to the liquid receiving plate, so that cooling liquid in the stator circulation channel flows to the liquid receiving plate through the reserved hole to flow into the speed reducer cavity.

Optionally, an input shaft and an intermediate shaft are arranged in the speed reducer cavity, a liquid dividing hole is formed in the liquid receiving plate, and cooling liquid flows into the speed reducer cavity through the liquid dividing hole and is supplied to a bearing of the input shaft and a bearing of the intermediate shaft.

Optionally, the liquid distribution hole is located at one end of the liquid receiving plate facing the motor assembly.

Optionally, the liquid receiving plate and the speed reducer shell are of an integrally formed structure.

Optionally, the rotor assembly includes a hollow rotor shaft, the reducer casing is provided with a rotor pipeline, and an outlet of the cooler is communicated with the rotor shaft through the rotor pipeline, so that the cooling liquid in the cooler flows into the rotor shaft through the rotor pipeline.

Optionally, a liquid guide pipe is arranged between the rotor pipeline and the rotor shaft.

Optionally, electricity drive assembly lubricating cooling system still includes the electron oil pump, reduction gear housing keeps away from the outer wall of the one end of motor assembly still is equipped with the secondary filter, the coarse filter through first income liquid branch road with the entry of electron oil pump is linked together, the export of electron oil pump through the second enter liquid branch road with the entry of secondary filter is linked together, the export of secondary filter through the third enter liquid branch road with the entry of cooler is linked together, first income liquid branch road the second enter liquid branch road and the third is entered liquid branch road and is linked together in proper order in order to form it is said to enter the liquid passageway.

Optionally, be equipped with the fender liquid board in the reduction gear cavity, the fender liquid board will the reduction gear cavity separates for stock solution chamber and stirring liquid chamber, the stock solution intracavity is equipped with the strainer, it is equipped with in the liquid chamber to stir differential mechanism, the fender liquid board is equipped with the gap, and the coolant liquid passes through the gap stock solution chamber with flow between the stirring liquid chamber.

The invention further provides a vehicle comprising the electric drive assembly lubricating and cooling system.

According to the technical scheme, the motor assembly and the speed reducer assembly which are connected are arranged in the lubricating and cooling system of the electric drive assembly, so that part of cooling liquid in the cavity of the speed reducer is supplied to the speed reducer assembly, and the differential mechanism in the cavity of the speed reducer is stirred to splash so as to lubricate and cool the speed reducer assembly; the other part of the water flows into a cooler for cooling after being filtered by a coarse filter. And one part of the cooled cooling liquid enters the rotor assembly through the rotor circulating channel, and the other part of the cooled cooling liquid enters the stator assembly through the stator circulating channel, so that the rotor assembly and the stator assembly are cooled and lubricated respectively. And the cooling liquid after cooling and lubricating the rotor assembly and the stator assembly is collected to the liquid return channel and flows back to the cavity of the speed reducer through the liquid return channel, so that the cooling and lubricating circulation of the next time is participated. So for the coolant liquid can lubricate the cooling to reduction gear assembly, can cool off lubricated to rotor assembly, stator assembly, thereby realized the coolant liquid to the cooling lubrication of reduction gear assembly and motor assembly, realized the cooling lubrication to the assembly overall structure that drives electrically, improved the radiating efficiency that drives the assembly electrically, improved the power density and the efficiency that drive the assembly electrically. Meanwhile, a liquid return channel is further arranged in the electric drive assembly lubricating and cooling system, so that cooling liquid participating in cooling and lubricating of the motor assembly can flow back to the cavity of the speed reducer through the liquid return channel to participate in the next cooling and lubricating circulation, the cooling liquid can be reused, and the use efficiency of the cooling liquid is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of an exemplary embodiment of an electric drive assembly lubrication cooling system according to the present invention;

FIG. 2 is a schematic illustration of an embodiment of the lubrication cooling system of the electric drive assembly of FIG. 1 with the second reducer housing removed;

FIG. 3 is an enlarged view of the structure at A in FIG. 2;

FIG. 4 is a left side view of the embodiment of FIG. 2 with a portion of the gears removed;

FIG. 5 is a cross-sectional view of an embodiment of a lubrication cooling system of the electric drive assembly of FIG. 1;

FIG. 6 is a coolant flow path diagram of an embodiment of an electric drive assembly lubrication cooling system;

figure 7 is a schematic view of an embodiment of the catheter of figure 5.

The reference numbers indicate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

At present, the electric drive assembly with high power density, high performance and high efficiency is obtained by adopting a mode of improving the heat dissipation efficiency of the electric drive assembly. Therefore, it is becoming increasingly important how cooling of electric drive assemblies is achieved.

The new energy electric drive can be divided into an oil cooler, a water cooler and an air cooler according to a motor cooling mode. The water cooling machine is characterized in that a motor is isolated from a cooling and lubricating system of a speed reducer or other transmission mechanisms, a motor shell needs to be independently provided with a water jacket, and the water jacket of the motor shell is connected with a cooling system of a whole vehicle to form a loop. However, in the method, because the thermal resistance between the casing water jacket and the heat source of the motor system is large, the cooling liquid cannot efficiently and directly cool the heat source, so that the cooling effect of the electric drive assembly is poor, and the high power of the electric drive assembly is not facilitated. The air cooling machine adopts a fan to cool the motor, and the method has high noise and low heat dissipation efficiency.

In view of this, the present invention provides an electric drive assembly lubrication cooling system.

Referring to fig. 1-7, in an embodiment of the present invention, the lubrication cooling system of the electric drive assembly includes an electric motor assembly 100 and a reducer assembly 200.

Referring to fig. 1 and 5, the motor assembly 100 includes a motor housing 110, a rotor assembly 120, and a stator assembly 130, wherein the rotor assembly 120 and the stator assembly 130 are disposed in the motor housing 110. Specifically, the motor assembly 100 includes a motor housing 110, and a rotor assembly 120 and a stator assembly 130 disposed in the motor housing 110, and the motor assembly 100 is divided into an inner rotor motor and an outer rotor motor. The inner rotor motor means that the rotor assembly 120 is located at a central axis position of the motor assembly 100, and the stator assembly 130 is sleeved outside the rotor assembly 120. The external rotor motor means that the stator assembly 130 is located at the central axis position of the motor assembly 100, and the rotor assembly 120 is sleeved outside the stator assembly 130. In the present invention, motor assembly 100 is an inner rotor motor. The motor assembly 100 may be a driving motor or a generator, and the driving motor mainly functions to generate a driving torque as a power source for electrical appliances or various machines. The main function of the generator is to convert mechanical energy into electrical energy, and the motor assembly 100 of the present invention can be used as a driving motor or a generator. During the normal operation of the motor assembly 100, the motor assembly 100 may generate heat due to the friction of the bearing, the resistance of the coil, the reluctance of the iron core, and the power loss, and the efficiency of the motor assembly 100 may be reduced due to the excessive heat.

Referring to fig. 1, 2 and 5, the reducer assembly 200 is connected to the motor assembly 100, the reducer assembly 200 includes a reducer housing 210, a reducer cavity 220 is formed in the reducer housing 210, a strainer 310 and a differential (not shown) are disposed in the reducer cavity 220, the strainer 310 is configured to filter the coolant in the reducer cavity 220, the differential is configured to stir the coolant in the reducer cavity 220 for splash lubrication, and a cooler 320 is disposed on an outer wall of an end of the reducer housing 210 away from the motor assembly 100.

Specifically, the reducer assembly 200 is mainly composed of gears, shafts, bearings, and a housing, and is mainly used to reduce the rotation speed and increase the torque, so that the vehicle can obtain a larger driving force to better adapt to the road conditions. The reducer assembly 200 includes a reducer case 210 disposed at the outermost layer, a reducer cavity 220 is formed in the reducer case 210, and a coolant flows in the reducer cavity 220. In the invention, the cooling liquid is oil liquid, the cooling oil has the advantages of sensitive heat balance capability, super heat conduction capability and the like, and meanwhile, the cooling oil can also be used as a lubricant. A coarse filter 310 is arranged in the reducer cavity 220, and the coarse filter 310 is a suction filter. The suction filter may direct coolant external to the electric drive assembly into the retarder cavity 220 such that the coolant cools and lubricates the electric drive assembly. The inside of suction filter also is provided with the filter screen, and it filters the coolant liquid when introducing the coolant liquid to get rid of the large granule impurity in the coolant liquid, in order to avoid large granule impurity to get into the damage that the electricity driven assembly caused to electricity drive the assembly. Be equipped with differential mechanism in the reduction gear cavity 220, differential mechanism rotates and to stir the coolant liquid in the reduction gear cavity 220 and splash to lubricate cooling to spare parts such as gear, axle, bearing in the reduction gear cavity 220, thereby reduce the frictional force in the reduction gear assembly 200 working process, reduce the heat production of reduction gear assembly 200 in the working process, also can cool down the heat that reduction gear assembly 200 during operation produced simultaneously, thereby reach the purpose to reduction gear assembly 200 cooling. The outer wall of the reducer case 210 at the end far away from the motor assembly 100 is further provided with a cooler 320, and in an embodiment, the cooler 320 is an oil cooler. The oil cooler can absorb heat from the cooling oil and exchange heat with ambient air or radiator coolant to cool the cooling oil.

Referring to fig. 1, the retarder housing 210 includes a first retarder housing 211 and a second retarder housing 212, the first retarder housing 211 and the second retarder housing 212 are connected in a surrounding manner, and a retarder cavity 220 is formed inside the first retarder housing 211 and the second retarder housing 212. In one embodiment, the first reducer case 211 and the second reducer case 212 are fixed by bolting. The first retarder housing 211 is located on a side of the second retarder housing 212 facing the motor housing 110, i.e., the first retarder housing 211 is located close to the motor housing 110. In the solution shown in the drawings, the first reducer housing 211 and the motor housing 110 are integrally formed, so that the first reducer housing 211 and the motor housing 110 do not need to be connected by an external connecting member, the overall structural strength and stability of the first reducer housing and the motor housing 110 are improved, and the first reducer housing 211 and the motor housing 110 are conveniently formed.

Referring to fig. 5 and 6, an inlet of the cooler 320 is communicated with the strainer 310 through a liquid inlet channel 410, an outlet of the cooler 320 is communicated with the rotor assembly 120 through a rotor circulation channel (not shown), an outlet of the cooler 320 is communicated with the stator assembly 130 through a stator circulation channel (not shown), and both the rotor assembly 120 and the stator assembly 130 are communicated with the reducer cavity 220 through a liquid return channel 420, so that the cooling liquid in the reducer cavity 220 flows through the stator assembly 130 and the rotor assembly 120 through the liquid inlet channel 410, the stator circulation channel and the rotor circulation channel, and then flows back to the reducer cavity 220 through the liquid return channel 420.

Specifically, the coolant in the retarder cavity 220 has two flow directions, wherein a portion of the coolant is agitated by the differential for splash lubrication of the retarder assembly 200 for lubrication cooling of the retarder assembly 200. The other part of the cooling liquid is filtered by the strainer 310 and flows into the cooler 320 through the liquid inlet channel 410, and the cooler 320 cools the cooling liquid and then flows in two paths. A part of the cooling fluid cools and lubricates the rotor assembly 120 through the rotor circulation channel; wherein another portion of the cooling fluid is used to cool and lubricate the stator assembly 130 through the stator circulation passage. The cooling liquid after cooling the rotor assembly 120 and the stator assembly 130 is collected to the liquid return channel 420 and returns to the speed reducer cavity 220 through the liquid return channel 420, so that the cooling liquid participates in the next cooling and lubricating circulation, a flowing loop of the cooling liquid is realized, cooling and heat dissipation of the cooling liquid on the speed reducer assembly 200, the rotor assembly 120 and the stator assembly 130 are realized, cooling and heat dissipation of the whole of the speed reducer assembly 200 and the motor assembly 100 are realized, the heat dissipation efficiency of the electric drive assembly is improved, and further the power density, the performance and the efficiency of the electric drive assembly are improved.

More specifically, after the cooling fluid flows into the inlet of the cooler 320 through the fluid inlet channel 410, the cooling fluid dissipates heat in the cooler 320 and then flows out of the outlet of the cooler 320. The rotor assembly 120 includes a rotor shaft 121 and two rotor bearings, wherein the two rotor bearings are respectively sleeved on the outer walls of the two ends of the rotor shaft 121 along the length direction thereof. Rotor shaft 121 is the hollow shaft, and through-hole 122 has all been seted up in being close to rotor bearing department at its length direction's both ends to the hollow shaft. The reducer casing 210 is provided with a rotor pipe 230 therein, and both ends of the rotor pipe 230 are respectively communicated with the outlet of the cooler 320 and the rotor shaft 121. In this manner, the cooling fluid in the cold zone device flows into the rotor assembly 120 through the outlet of the cooler 320, the rotor pipe 230, the hollow rotor shaft 121. The coolant flowing into the rotor assembly 120 flows in two directions, wherein a part of the coolant flows out to the rotor bearing at one end of the speed reducer assembly 200 along the through hole 122 on the rotor shaft 121 at the end close to the speed reducer assembly 200 to lubricate the rotor bearing at one end close to the speed reducer assembly 200; another part of the cooling fluid flows along the hollow rotor shaft 121 to the end away from the reducer assembly 200, and the cooling fluid flowing to the end of the rotor shaft 121 away from the reducer assembly 200 flows to the rotor bearing at the end through the through hole 122 at the end. In this way, cooling and lubrication of the rotor shaft 121 and the rotor bearing of the rotor assembly 120 are achieved, thereby improving the overall cooling and heat dissipation efficiency of the rotor assembly 120.

Referring to fig. 5 and 6, a liquid flow pipeline 111 is disposed on the motor housing 110, a stator pipeline 240 is disposed in the reducer housing 210, and two ends of the stator pipeline 240 are respectively communicated with the outlet of the cooler 320 and the liquid flow pipeline 111. The fluid flow pipe 111 has a fluid flow port 112 formed therein, and the fluid flow port 112 opens toward the inside of the motor housing 110. In this way, the cooling fluid in the cooler 320 flows into the stator assembly 130 inside the motor housing 110 through the opening of the cooler 320, the stator pipeline 240, the fluid pipeline 111 and the fluid port 112 to cool and lubricate the stator assembly 130.

Both ends of the motor assembly 100 along the length direction thereof are provided with liquid collecting rings 140, and cooling liquid after cooling and lubricating the rotor assembly 120 and the stator assembly 130 flows into the two liquid collecting rings 140 respectively. The motor housing 110 further has a fluid return passage 420 communicating with the reducer cavity 220, and in one embodiment, the fluid return passage 420 and the fluid flow pipe 111 are respectively disposed on two opposite sides of the motor housing 110. Both liquid collecting rings 140 are also communicated with the liquid return channel 420. In this way, the coolant in the liquid collecting ring 140 flows back into the reducer cavity 220 through the liquid returning channel 420 to participate in the next cooling cycle.

It should be noted that the assembly relationship among the rotor assembly 120, the stator assembly 130 and the liquid collecting ring 140 in the motor assembly 100 is the prior art and will not be described herein.

According to the technical scheme, the motor assembly 100 and the speed reducer assembly 200 which are connected are arranged in the lubrication cooling system of the electric drive assembly, so that part of cooling liquid in the cavity 220 of the speed reducer is supplied to the speed reducer assembly 200, and differential stirring liquid in the cavity 220 of the speed reducer splashes to lubricate and cool the speed reducer assembly 200; the other part is filtered by the strainer 310 and then flows into the cooler 320 through the liquid inlet channel 410 to be cooled. One part of the cooled cooling liquid enters the rotor assembly 120 through the rotor circulation channel, and the other part of the cooled cooling liquid enters the stator assembly 130 through the stator circulation channel, so that the rotor assembly 120 and the stator assembly 130 are cooled and lubricated respectively. The cooling liquid after cooling and lubricating the rotor assembly 120 and the stator assembly 130 is collected in the liquid return channel 420, and flows back to the reducer cavity 220 through the liquid return channel 420, so as to participate in the next cooling and lubricating cycle. So, make the coolant liquid can lubricate cooling to reduction gear assembly 200, can carry out cooling-lubrication to rotor assembly 120, stator assembly 130, thereby realized the coolant liquid to reduction gear assembly 200 and motor assembly 100's cooling-lubrication, realized the cooling-lubrication to the assembly overall structure that drives of electricity, improved the radiating efficiency that drives the assembly of electricity, improved the power density and the efficiency that drive the assembly of electricity. Meanwhile, the electric drive assembly lubricating and cooling system is also provided with a liquid return channel 420, so that the cooling liquid participating in cooling and lubricating of the motor assembly 100 can flow back to the reducer cavity 220 through the liquid return channel 420 to participate in the next cooling and lubricating circulation, the cooling liquid can be reused, and the use efficiency of the cooling liquid is improved.

Referring to fig. 2 and fig. 3, a liquid receiving plate 270 is disposed in the speed reducer cavity 220, the stator circulation channel is provided with a reserved hole 113, and the reserved hole 113 is communicated to the liquid receiving plate 270, so that the cooling liquid in the stator circulation channel flows to the liquid receiving plate 270 through the reserved hole 113 to flow into the speed reducer cavity 220.

Specifically, the stator circulation channel is provided with a reserved hole 113, and in one embodiment, the reserved hole 113 is provided on the liquid flow pipeline 111 of the motor housing 110. Generally, the prepared hole 113 is not opened. When the lubricating demand of the speed reducer assembly 200 cannot be met by splashing of the stirring liquid of the speed reducer, the preformed hole 113 can be opened, so that the speed reducer assembly 200 is subjected to forced lubrication and cooling. The preformed hole 113 may be configured to have other shapes such as a circle, an ellipse, and the like, and the shape and the size of the preformed hole 113 are not limited herein. Be equipped with in the reduction gear cavity 220 and connect liquid board 270, the back is got through to preformed hole 113, and the coolant liquid in the liquid stream pipeline 111 can flow on connecing liquid board 270 through preformed hole 113, and then flows into in the reduction gear cavity 220 from connecing liquid board 270 to carry out lubricated cooling to spare parts such as axle, gear, bearing in the reduction gear cavity 220. The preformed hole 113 is formed in the liquid flow pipeline 111, and the preformed hole 113 can be communicated with the liquid receiving plate 270 in the speed reducer cavity 220 after being opened. That is, as long as the coolant in the liquid flow pipeline 111 can flow into the retarder cavity 220 through the preformed hole 113 and the liquid receiving plate 270, the specific position of the preformed hole 113 on the liquid flow pipeline 111 is not limited herein. In one embodiment, the liquid receiving plate 270 is V-shaped, and the cooling liquid from the liquid flow pipeline 111 can be temporarily stored at the included angle of the V-shape to stabilize the flow of the cooling liquid. Meanwhile, the cooling liquid on the liquid receiving plate 270 can be drained into the speed reducer cavity 220 through the included angle to lubricate and cool the speed reducer assembly 200, and the position of the cooling liquid flowing into the speed reducer cavity 220 can be determined by setting the included angle position and size of the liquid receiving plate 270. Of course, the liquid receiving plate 270 may be W-shaped. Here, the specific shape of the liquid-receiving plate 270 is not limited. The electric drive assembly lubricating and cooling system is used for ensuring the motor assembly 100 to be fully cooled, and meanwhile, a forced lubricating structure for the speed reducer assembly 200 is reserved by arranging the reserved hole 113, when the requirement cannot be met by splashing lubrication of the speed reducer assembly 200, the reserved hole 113 is communicated to realize forced lubricating and cooling of the speed reducer assembly 200, and the heat dissipation efficiency of the electric drive assembly lubricating and cooling system is further improved.

Referring to fig. 2 and 3, an input shaft 510 and an intermediate shaft 520 are disposed in the reducer cavity 220, a liquid distribution hole 271 is disposed on the liquid receiving plate 270, and the cooling liquid flows into the reducer cavity 220 through the liquid distribution hole 271 and is supplied to the bearing of the input shaft 510 and the bearing of the intermediate shaft 520. Specifically, an input shaft 510, an intermediate shaft 520 and an output shaft 530 which are in transmission connection are arranged in the reducer cavity 220, the input shaft 510 transmits the power of the motor assembly 100 to the intermediate shaft 520, the intermediate shaft 520 is transmitted to the output shaft 530, and the output shaft 530 transmits the power to the wheels of the vehicle, so that the driving of the vehicle is realized. For convenience of description, the longitudinal direction of the input shaft 510 is defined as the longitudinal direction of the liquid receiving plate 270. The liquid receiving plate 270 is provided above the input shaft 510 and the intermediate shaft 520, the liquid separating hole 271 is provided in the liquid receiving plate 270, and the coolant flowing from the reserve hole 113 to the liquid receiving plate 270 flows in two directions. Part of the cooling liquid flows to the edge of one end of the liquid receiving plate 270 away from the motor assembly 100 along the length direction of the liquid receiving plate 270, flows into the speed reducer cavity 220, is used for stirring and splashing the differential, supplements the splashing lubricating cooling liquid for the differential, and further improves the effect of stirring and splashing the lubricating liquid for the differential. Another portion of the cooling fluid flows to the bearings of the input shaft 510 and the bearings of the intermediate shaft 520 through the fluid distribution holes 271 of the fluid receiving plate 270 to lubricate the bearings of the input shaft 510 and the bearings of the intermediate shaft 520, so as to improve the lubricating effect of the reducer assembly 200.

In the invention, the electric drive assembly is vertically arranged in the engine room, namely the height direction of the electric drive assembly is consistent with the height direction of the vehicle. The vertical arrangement of the electric drive assembly reduces the installation space required by the electric drive assembly, saves the installation and arrangement space in the cabin and is beneficial to the arrangement of the space of the whole vehicle. The electric drive assembly has a length and a height, the input shaft 510, the intermediate shaft 520 and the output shaft 530 extend in the length direction of the electric drive assembly, and the height direction of the electric drive assembly is perpendicular to the length direction of the electric drive assembly. In the height direction of the electric drive assembly, the liquid-contact plate 270 is located above the input shaft 510 and the intermediate shaft 520, the input shaft 510 and the intermediate shaft 520 are located above the output shaft 530, and the output shaft 530 is located above the differential. Thus, when the differential is splash-lubricated, the output shaft 530 has a better lubrication effect than the input shaft 510 and the intermediate shaft 520. The liquid distribution holes 271 are formed, so that the cooling liquid on the liquid receiving plate 270 can directly lubricate the input shaft 510 and the intermediate shaft 520, and the lubricating effect of the input shaft 510 and the intermediate shaft 520 is improved.

Referring to fig. 3, further, the liquid-separating hole 271 is located at an end of the liquid-receiving plate 270 facing the motor assembly 100. Specifically, in one embodiment, the bearing of the input shaft 510 and the bearing of the intermediate shaft 520 are disposed at one end of the reducer cavity 220 close to the motor housing 110, and the liquid distribution hole 271 is disposed at one end of the liquid receiving plate 270 close to the motor assembly 100 along the length direction thereof, so that the cooling liquid flowing out from the liquid distribution hole 271 can directly lubricate the bearing of the input shaft 510 and the bearing of the intermediate shaft 520, thereby improving the lubricating effect of the input shaft 510 and the intermediate shaft 520, and improving the lubricating and cooling efficiency of the reducer assembly 200.

Referring to fig. 3, the liquid receiving plate 270 and the reducer case 210 are further formed as an integral structure. Specifically, the reducer housing 210 includes a first reducer housing 211 adjacent to the motor housing 110 and a second reducer housing 212 remote from the motor housing 110. In one embodiment, the first reducer housing 211 is integrally formed with the motor housing 110. The liquid receiving plate 270 is disposed adjacent to the first decelerator housing 211 to facilitate communication with the prepared hole 113. In one embodiment, the liquid receiving plate 270 and the first reducer case 211 are integrally formed, that is, one end of the liquid receiving plate 270 facing the motor case 110 along the length direction thereof is fixed to the first reducer case 211. Connect the integrated into one piece structure of liquid board 270 and first reduction gear housing 211, made things convenient for the processing that connects liquid board 270 and first reduction gear housing 211, be favorable to connecing the stability of being connected and the leakproofness between liquid board 270 and the first reduction gear housing 211, avoided the coolant liquid from connecing overflowing of the joint gap 251 department between liquid board 270 and the first reduction gear housing 211, guaranteed the leakproofness of the flow path of coolant liquid.

Referring to fig. 5, further, the rotor assembly 120 includes a hollow rotor shaft 121, the reducer case 210 is provided with a rotor pipe 230, and an outlet of the cooler 320 is communicated with the rotor shaft 121 through the rotor pipe 230, so that the cooling liquid in the cooler 320 flows into the rotor shaft 121 through the rotor pipe 230. Specifically, the rotor shaft 121 is a hollow shaft having a cavity formed therein for flowing a cooling fluid. The reducer casing 210 is provided with a rotor pipe 230, and two ends of the rotor pipe 230 are respectively communicated with the outlet of the cooling liquid and one end of the rotor shaft 121 facing the reducer assembly 200. In this way, the cooling liquid cooled by the cooler 320 flows out from the outlet of the cooler 320 through the rotor pipe 230 and flows into the cavity of the rotor shaft 121, so that cooling is introduced into the rotor assembly 120 to cool and lubricate the rotor assembly 120.

Referring to fig. 5 and 7, a liquid guiding tube 260 is further disposed between the rotor pipe 230 and the rotor shaft 121. Specifically, in order to improve the sealing performance of the connection between the rotor pipe 230 and the rotor shaft 121, a liquid guide tube 260 is provided therebetween. In one embodiment, both ends of the catheter 260 along the length direction thereof respectively extend into the cavities of the rotor pipe 230 and the rotor shaft 121, and the outer wall of the catheter 260 is further provided with a sealing rib 261. In one aspect, the sealing rib 261 may abut against the edges of the rotor tubing 230 and the rotor shaft 121 to achieve the connection between the catheter 260 and the rotor tubing 230, the rotor shaft 121; on the other hand, the sealing rib 261 can also prevent the cooling liquid from flowing to the outer wall of the liquid guide pipe 260, so that the cooling liquid can only flow through the inside of the liquid guide pipe 260, the flowing of the cooling liquid to the outside of the rotor pipeline 230 and the outside of the rotor shaft 121 is avoided, and the flowing sealing performance of the cooling liquid is ensured; on the other hand, the arrangement of the sealing rib 261 also improves the structural strength of the liquid guide tube 260, avoids the deformation of the liquid guide tube 260 under the stress condition, and further avoids the failure of the connection sealing property between the rotor pipeline 230 and the rotor shaft 121 after the deformation of the liquid guide tube 260. The sealing rib 261 is provided on the outer wall of the catheter 260, and in one embodiment, the sealing rib 261 includes an axial sealing rib 261 and a circumferential sealing rib 261, and the circumferential sealing rib 261 is annularly sealed along the entire circumference of the catheter 260 to abut against the rotor pipe 230. The axial seal ribs 261 extend in the axial direction of the catheter 260, and are provided in plurality at intervals in the circumferential direction of the catheter 260 so as to abut against the rotor shaft 121. Of course, the sealing rib 261 may also be two circumferential sealing ribs 261, and the two sealing ribs 261 abut against the rotor pipe 230 and the rotor shaft 121, respectively.

Referring to fig. 5 and fig. 6, further, the electric drive assembly lubrication cooling system further includes an electronic oil pump 330, a fine filter 340 is further disposed on an outer wall of one end of the reducer housing 210 away from the motor assembly 100, the coarse filter 310 is communicated with an inlet of the electronic oil pump 330 through a first liquid inlet branch 411, an outlet of the electronic oil pump 330 is communicated with an inlet of the fine filter 340 through a second liquid inlet branch 412, an outlet of the fine filter 340 is communicated with an inlet of the cooler 320 through a third liquid inlet branch 413, and the first liquid inlet branch 411, the second liquid inlet branch 412, and the third liquid inlet branch 413 are sequentially communicated to form a liquid inlet channel 410.

Specifically, the electric drive assembly lubrication cooling system further includes an electronic oil pump 330 and a fine filter 340, an inlet of the electronic oil pump 330 is communicated with the coarse filter 310 through a first liquid inlet branch 411, so that the electronic oil pump 330 can pump and pressurize the cooling liquid filtered by the coarse filter 310 in the speed reducer cavity 220 and then convey the cooling liquid to the fine filter 340. The fine filter 340 is communicated with the outlet of the electronic oil pump 330 through the second liquid inlet branch 412 to perform a second filtering on the coolant, so as to improve the cleanliness of the coolant, provide clean coolant for the electric drive assembly, and avoid the damage of impurities in the coolant to the electric drive assembly. The coolant filtered by the fine filter 340 is communicated with the inlet of the cooler 320 through the third liquid inlet branch 413, and the cooler 320 cools the coolant to ensure the cooling and lubricating effects of the coolant on the electric drive assembly. The first inlet branch 411, the second inlet branch 412 and the third inlet branch 413 are disposed on the motor housing 110 or the reducer housing 210, and are sequentially connected to form the inlet channel 410.

Referring to fig. 4 and 5, further, a liquid baffle 250 is disposed in the reducer cavity 220, the liquid baffle 250 divides the reducer cavity 220 into a liquid storage cavity 221 and a liquid stirring cavity 222, a coarse filter 310 is disposed in the liquid storage cavity 221, a differential is disposed in the liquid stirring cavity 222, a gap 251 is disposed on the liquid baffle 250, and the coolant flows between the liquid storage cavity 221 and the liquid stirring cavity 222 through the gap 251.

Specifically, the electric drive assembly is vertically disposed within the nacelle to reduce the installation space thereof. But the vertical placement makes the coolant easily accumulate near the differential, so that the liquid stirring resistance of the differential is relatively large. A liquid baffle plate 250 is arranged in the reducer cavity 220, and the reducer cavity 220 is divided into a liquid storage cavity 221 and a liquid stirring cavity 222 by the liquid baffle plate 250. A strainer 310 is disposed in the liquid storage chamber 221 to filter the cooling liquid. A differential is arranged in the liquid stirring cavity 222 to stir the liquid for splash lubrication. The liquid baffle 250 is provided with a gap 251, and the cooling liquid can flow between the liquid storage cavity 221 and the liquid stirring cavity 222 through the gap 251. Thus, the liquid baffle 250 is arranged to enable most of the cooling liquid to be in the liquid storage cavity 221, so that sufficient cooling liquid is provided for the electronic oil pump 330, and the electronic oil pump 330 is prevented from being sucked by air; a small part of cooling liquid is in the liquid stirring cavity 222, so that the splashing lubrication of the differential mechanism liquid stirring is met, and the differential mechanism liquid stirring resistance caused by the fact that a large amount of cooling liquid is in the liquid stirring cavity 222 is avoided.

The invention further provides a vehicle, which comprises an electric drive assembly lubricating and cooling system, the specific structure of the electric drive assembly lubricating and cooling system refers to the above embodiments, and the vehicle adopts all technical schemes of all the above embodiments, so that the vehicle at least has all beneficial effects brought by the technical schemes of the above embodiments, and the details are not repeated herein.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An electric drive assembly lubrication cooling system, comprising:

2. The electric drive assembly lubrication cooling system of claim 1, wherein a liquid receiving plate is disposed in the speed reducer cavity, and the stator circulation channel is provided with a reserved hole which is communicated to the liquid receiving plate, so that the cooling liquid in the stator circulation channel flows to the liquid receiving plate through the reserved hole to flow into the speed reducer cavity.

3. The electric drive assembly lubrication cooling system of claim 2, wherein the speed reducer cavity has an input shaft and an intermediate shaft, and the liquid receiving plate has liquid dividing holes, and the liquid cooling liquid flows into the speed reducer cavity through the liquid dividing holes and is supplied to the bearings of the input shaft and the bearings of the intermediate shaft.

4. The electric drive assembly lubrication cooling system of claim 3, wherein the fluid distribution holes are located at an end of the fluid receiving plate facing the electric machine assembly.

5. The electric drive assembly lubrication cooling system of claim 2, wherein the pickup plate is integrally formed with the reducer case.

6. The electric drive assembly lubrication cooling system of claim 1, wherein the rotor assembly includes a hollow rotor shaft, and wherein the reducer housing includes a rotor passage, and wherein the outlet of the cooler is in communication with the rotor shaft through the rotor passage, such that the coolant in the cooler flows into the rotor shaft through the rotor passage.

7. The electric drive assembly lubrication cooling system of claim 6, wherein a fluid conduit is disposed between the rotor tube and the rotor shaft.

8. The lubrication and cooling system for an electric drive assembly as set forth in claim 1, wherein said lubrication and cooling system for an electric drive assembly further comprises an electronic oil pump, a fine filter is further disposed on an outer wall of an end of said reducer housing remote from said motor assembly, said coarse filter is communicated with an inlet of said electronic oil pump through a first liquid inlet branch, an outlet of said electronic oil pump is communicated with an inlet of said fine filter through a second liquid inlet branch, an outlet of said fine filter is communicated with an inlet of said cooler through a third liquid inlet branch, and said first liquid inlet branch, said second liquid inlet branch and said third liquid inlet branch are sequentially communicated to form said liquid inlet passage.

9. The electric drive assembly lubrication cooling system of any one of claims 1 to 8, wherein a liquid baffle is disposed within the reducer cavity and separates the reducer cavity into a reservoir chamber and an agitator chamber, the reservoir chamber having the strainer disposed therein, the agitator chamber having the differential disposed therein, the liquid baffle having a gap through which coolant flows between the reservoir chamber and the agitator chamber.

10. A vehicle comprising an electric drive assembly lubrication cooling system as defined in any one of claims 1 to 9.