Electric drive assembly lubrication cooling system and vehicle

Abstract

The present invention discloses an electric drive assembly lubrication and cooling system and a vehicle, wherein the electric drive assembly lubrication and cooling system includes a motor assembly and a reducer assembly, the reducer assembly is connected to the motor assembly, a coarse filter and a differential are arranged in the reducer cavity, and a cooler is arranged on the outer wall of the reducer housing; the inlet of the cooler is connected to the coarse filter through a liquid inlet channel, the outlet of the cooler is connected to the rotor assembly through a rotor circulation channel, the outlet of the cooler is connected to the stator assembly through a stator circulation channel, and the rotor assembly and the stator assembly are both connected to the reducer cavity through a liquid return channel, so that the coolant in the reducer cavity flows through the liquid inlet channel, the stator circulation channel, and the rotor circulation channel through the stator assembly and the rotor assembly, and then flows back to the reducer cavity through the liquid return channel. The technical solution of the present invention improves the heat dissipation efficiency of the electric drive assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to an electric drive assembly lubrication and cooling system and a vehicle. Background Art

[0002] With the continuous development of new energy vehicles, the energy consumption economy targets of electric vehicles are getting higher and higher, which requires the electric drive system to continuously improve efficiency and reduce losses. Designing high power density, high performance and high efficiency electric drive systems has become the current research focus.

[0003] At present, the heat dissipation efficiency of the electric drive assembly is often improved to obtain an electric drive assembly with high power density, high performance and high efficiency. Therefore, how to achieve cooling of the electric drive assembly is becoming more and more important. Summary of the invention

[0004] The main purpose of the present invention is to provide a lubrication and cooling system for an electric drive assembly, aiming to improve the heat dissipation efficiency of the electric drive assembly.

[0005] To achieve the above-mentioned purpose, the electric drive assembly lubrication and cooling system proposed in the present invention comprises:

[0006] A motor assembly, comprising a motor housing, a rotor assembly and a stator assembly, wherein the rotor assembly and the stator assembly are arranged in the motor housing; and

[0007] A reducer assembly is connected to the motor assembly, the reducer assembly includes a reducer housing, a reducer cavity is formed in the reducer housing, a coarse filter and a differential are arranged in the reducer cavity, the coarse filter is used to filter the coolant in the reducer cavity, the differential is used to stir and splash lubricate the coolant in the reducer cavity, and a cooler is arranged on the outer wall of the reducer housing at one end away from the motor assembly;

[0008] The inlet of the cooler is communicated with the coarse filter through a liquid inlet channel, the outlet of the cooler is communicated with the rotor assembly through a rotor circulation channel, the outlet of the cooler is communicated with the stator assembly through a stator circulation channel, and both the rotor assembly and the stator assembly are communicated with the reducer cavity through a liquid return channel, so that the coolant in the reducer cavity flows through the liquid inlet channel, the stator circulation channel, and the rotor circulation channel, passes through the stator assembly and the rotor assembly, and then flows back to the reducer cavity through the liquid return channel.

[0009] Optionally, a liquid receiving plate is provided in the reducer cavity, and a reserved hole is provided in the stator circulation channel, and the reserved hole is connected to the liquid receiving plate, so that the coolant in the stator circulation channel flows through the reserved hole to the liquid receiving plate to flow into the reducer cavity.

[0010] Optionally, an input shaft and an intermediate shaft are provided in the reducer cavity, and a liquid separation hole is provided on the liquid receiving plate, through which the coolant flows into the reducer cavity and is supplied to the bearings of the input shaft and the intermediate shaft.

[0011] Optionally, the liquid separation hole is located at one end of the liquid receiving plate facing the motor assembly.

[0012] Optionally, the liquid receiving plate and the reducer housing are an integrally formed structure.

[0013] Optionally, the rotor assembly includes a hollow rotor shaft, the reducer housing is provided with a rotor pipeline, and the outlet of the cooler is connected to the rotor shaft through the rotor pipeline, so that the coolant in the cooler flows into the rotor shaft through the rotor pipeline.

[0014] Optionally, a liquid guide tube is provided between the rotor pipeline and the rotor shaft.

[0015] Optionally, the electric drive assembly lubrication and cooling system also includes an electronic oil pump, and a fine filter is also provided on the outer wall of the reducer housing at one end away from the motor assembly, the coarse filter is connected to the inlet of the electronic oil pump through a first liquid inlet branch, the outlet of the electronic oil pump is connected to the inlet of the fine filter through a second liquid inlet branch, the outlet of the fine filter is connected to the inlet of the cooler through a third liquid inlet branch, and the first liquid inlet branch, the second liquid inlet branch and the third liquid inlet branch are sequentially connected to form the liquid inlet channel.

[0016] Optionally, a liquid baffle is provided in the reducer cavity, the liquid baffle divides the reducer cavity into a liquid storage cavity and a liquid stirring cavity, the coarse filter is provided in the liquid storage cavity, the differential is provided in the liquid stirring cavity, and the liquid baffle is provided with a gap, through which the coolant flows between the liquid storage cavity and the liquid stirring cavity.

[0017] The present invention also provides a vehicle, comprising the electric drive assembly lubrication and cooling system.

[0018] A technical solution of the present invention is to set a connected motor assembly and reducer assembly in the lubrication and cooling system of the electric drive assembly, so that part of the coolant in the reducer cavity is supplied to the reducer assembly, causing the differential in the reducer cavity to splash and lubricate and cool the reducer assembly; the other part is filtered by a coarse filter and flows into the cooler through the liquid inlet channel for cooling. Part of the cooled coolant enters the rotor assembly through the rotor circulation channel, and the other part enters the stator assembly through the stator circulation channel, thereby cooling and lubricating the rotor assembly and the stator assembly respectively. The coolant after cooling and lubricating the rotor assembly and the stator assembly is collected in the return liquid channel, flows back to the reducer cavity through the return liquid channel, and then participates in the next cooling and lubrication cycle. In this way, the coolant can lubricate and cool the reducer assembly, and can cool and lubricate the rotor assembly and the stator assembly, thereby realizing the cooling and lubrication of the reducer assembly and the motor assembly by the coolant, realizing the cooling and lubrication of the overall structure of the electric drive assembly, improving the heat dissipation efficiency of the electric drive assembly, and improving the power density and efficiency of the electric drive assembly. At the same time, a return liquid channel is also provided in the lubrication and cooling system of the electric drive assembly, so that the coolant after participating in the cooling and lubrication of the motor assembly can flow back to the reducer cavity through the return liquid channel to participate in the next cooling and lubrication cycle, so that the coolant can be reused, and the use efficiency of the coolant is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the lubrication and cooling system of the electric drive assembly of the present invention;

[0021] Figure 2 for Figure 1 A schematic structural diagram of an embodiment of the electric drive assembly lubrication and cooling system after removing the second reducer housing;

[0022] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0023] Figure 4 for Figure 2 A left side view of an embodiment after some gears are removed;

[0024] Figure 5 for Figure 1 A cross-sectional view of an embodiment of a lubrication and cooling system for an electric drive assembly;

[0025] Figure 6 A coolant flow path diagram of an embodiment of a lubrication and cooling system for an electric drive assembly;

[0026] Figure 7 for Figure 5 A schematic structural diagram of an embodiment of a central catheter.

[0027] Description of Figure Numbers:

[0028]

[0029]

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] With the continuous development of new energy vehicles, the energy consumption economy targets of electric vehicles are getting higher and higher, which requires the electric drive system to continuously improve efficiency and reduce losses. Designing high power density, high performance and high efficiency electric drive systems has become the current research focus.

[0035] At present, the heat dissipation efficiency of the electric drive assembly is often improved to obtain an electric drive assembly with high power density, high performance and high efficiency. Therefore, how to achieve cooling of the electric drive assembly is becoming more and more important.

[0036] New energy electric drives can be divided into oil coolers, water coolers and air coolers according to the motor cooling method. A water cooler is a cooling and lubrication system that isolates the motor from the reducer or other transmission mechanism. The motor housing needs to be designed with an independent water jacket, and the housing water jacket is then connected to the vehicle cooling system to form a loop. However, due to the large thermal resistance between the housing water jacket and the heat source of the motor system, the coolant cannot efficiently and directly cool the heat source, resulting in poor cooling effect of the electric drive assembly, which is not conducive to the high power of the electric drive assembly. An air cooler uses a fan to dissipate heat and cool the motor. This method is noisy and has low heat dissipation efficiency.

[0037] In view of this, the present invention proposes an electric drive assembly lubrication and cooling system.

[0038] Please refer to Figures 1 to 7 In an embodiment of the present invention, the electric drive assembly lubrication and cooling system includes a motor assembly 100 and a reducer assembly 200 .

[0039] Please refer to Figure 1 and Figure 5 , the motor assembly 100 includes a motor housing 110, a rotor assembly 120 and a stator assembly 130, and the rotor assembly 120 and the stator assembly 130 are arranged 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 arranged 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 refers to a motor in which the rotor assembly 120 is located at the central axis position of the motor assembly 100, and the stator assembly 130 is sleeved outside the rotor assembly 120. The outer rotor motor refers to a motor in which 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, the motor assembly 100 is an inner rotor motor. The motor assembly 100 can be a drive motor or a generator. The main function of the drive motor is to generate a drive torque as a power source for electrical appliances or various machines. The main function of a generator is to convert mechanical energy into electrical energy. The motor assembly 100 of the present invention can be used as a drive motor or a generator. During normal operation, the motor assembly 100 generates heat due to bearing friction, coil resistance, core magnetic resistance, power loss, etc. Excessive heat will reduce the efficiency of the motor assembly 100.

[0040] Please refer to Figure 1 , Figure 2 and Figure 5The reducer assembly 200 is connected to the motor assembly 100, and the reducer assembly 200 includes a reducer housing 210, a reducer cavity 220 is formed in the reducer housing 210, a coarse filter 310 and a differential (not shown) are provided in the reducer cavity 220, the coarse filter 310 is used to filter the coolant in the reducer cavity 220, and the differential is used to stir and splash lubricate the coolant in the reducer cavity 220, and a cooler 320 is provided on the outer wall of the reducer housing 210 at one end away from the motor assembly 100.

[0041] Specifically, the reducer assembly 200 is mainly composed of gears, shafts, bearings, housings and other components, which are mainly used to reduce the speed and increase the torque, so that the vehicle can obtain greater driving force to better adapt to road conditions. The reducer assembly 200 includes a reducer housing 210 arranged at the outermost layer, and a reducer cavity 220 is formed in the reducer housing 210, and a coolant flows in the reducer cavity 220. In the present invention, the coolant is selected from oil, and the cooling oil has the advantages of sensitive thermal balance ability, super strong thermal conductivity, etc., and 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 can introduce the coolant outside the electric drive assembly into the reducer cavity 220, so that the coolant cools and lubricates the electric drive assembly. A filter screen is also arranged inside the suction filter, which filters the coolant while introducing the coolant to remove large particles of impurities in the coolant to avoid large particles of impurities entering the electric drive assembly and causing damage to the electric drive assembly. A differential is provided in the reducer cavity 220. The rotation of the differential can stir and splash the coolant in the reducer cavity 220, thereby lubricating and cooling the gears, shafts, bearings and other parts in the reducer cavity 220, thereby reducing the friction during the operation of the reducer assembly 200, reducing the heat generated by the reducer assembly 200 during the operation, and also cooling the heat generated when the reducer assembly 200 is working, thereby achieving the purpose of cooling the reducer assembly 200. A cooler 320 is also provided on the outer wall of the reducer housing 210 at one end away from the motor assembly 100. In one embodiment, the cooler 320 is an oil cooler. The oil cooler can absorb the heat of the cooling oil and exchange heat with the ambient air or the radiator coolant to cool the cooling oil.

[0042] Please refer to Figure 1The reducer housing 210 includes a first reducer housing 211 and a second reducer housing 212, which are connected to each other and form a reducer cavity 220 inside the first reducer housing 211 and the second reducer housing 212. In one embodiment, the first reducer housing 211 and the second reducer housing 212 are fixed by bolt connection. The first reducer housing 211 is located on the side of the second reducer housing 212 facing the motor housing 110, that is, the first reducer housing 211 is arranged close to the motor housing 110. In the scheme shown in the figure of the present invention, the first reducer housing 211 and the motor housing 110 are an integrally formed structure, so that the first reducer housing 211 and the motor housing 110 do not need to be connected by an external connector, which improves the overall structural strength and stability of the first reducer and the motor housing 110, and also facilitates the processing and forming of the first reducer housing 211 and the motor housing 110.

[0043] Please refer to Figure 5 and Figure 6 The inlet of the cooler 320 is connected to the coarse filter 310 through the liquid inlet channel 410, the outlet of the cooler 320 is connected to the rotor assembly 120 through the rotor circulation channel (not shown), the outlet of the cooler 320 is connected to the stator assembly 130 through the stator circulation channel (not shown), and the rotor assembly 120 and the stator assembly 130 are both connected to the reducer cavity 220 through the return liquid channel 420, so that the coolant in the reducer cavity 220 flows through the liquid inlet channel 410, the stator circulation channel, and the rotor circulation channel through the stator assembly 130 and the rotor assembly 120, and then flows back to the reducer cavity 220 through the return liquid channel 420.

[0044] Specifically, the coolant in the reducer cavity 220 flows in two directions, one part of which is stirred by the differential and used for splash lubrication of the reducer assembly 200 to lubricate and cool the reducer assembly 200. The other part of the coolant is filtered by the coarse filter 310 and flows into the cooler 320 through the liquid inlet channel 410. After the cooler 320 cools the coolant, it flows in two ways. One part of the coolant cools and lubricates the rotor assembly 120 through the rotor circulation channel; the other part of the coolant cools and lubricates the stator assembly 130 through the stator circulation channel. The coolant after cooling the rotor assembly 120 and the stator assembly 130 is collected in the liquid return channel 420, and returned to the reducer cavity 220 through the liquid return channel 420, so that the coolant participates in the next cooling and lubrication cycle, thereby realizing the flow loop of the coolant, realizing the cooling and heat dissipation of the reducer assembly 200, the rotor assembly 120, and the stator assembly 130 by the coolant, realizing the overall cooling and heat dissipation of the reducer assembly 200 and the motor assembly 100, improving the heat dissipation efficiency of the electric drive assembly, and thereby improving the power density, performance and efficiency of the electric drive assembly.

[0045] More specifically, after the coolant flows into the inlet of the cooler 320 through the liquid inlet channel 410, the coolant dissipates heat in the cooler 320 and then flows out from the outlet of the cooler 320. The rotor assembly 120 includes a rotor shaft 121 and two rotor bearings, and the two rotor bearings are respectively sleeved on the outer walls of the rotor shaft 121 at both ends along the length direction thereof. The rotor shaft 121 is a hollow shaft, and through holes 122 are provided at both ends of the hollow shaft along the length direction thereof near the rotor bearings. A rotor pipeline 230 is provided in the reducer housing 210, and the two ends of the rotor pipeline 230 are respectively connected to the outlet of the cooler 320 and the rotor shaft 121. In this way, the coolant in the cold zone flows into the rotor assembly 120 through the outlet of the cooler 320, the rotor pipeline 230, and the hollow rotor shaft 121. The coolant flowing into the rotor assembly 120 flows in two directions, one part of which flows out along the through hole 122 on the rotor shaft 121 at one end close to the reducer assembly 200 to the rotor bearing at that end, and lubricates the rotor bearing at that end close to the reducer assembly 200; the other part of the coolant flows along the hollow rotor shaft 121 to the end away from the reducer assembly 200, and the coolant flowing to the end of the rotor shaft 121 away from the reducer assembly 200 flows to the rotor bearing at that end through the through hole 122 at that end. In this way, the cooling and lubrication of the rotor shaft 121 and the rotor bearing of the rotor assembly 120 is achieved, thereby improving the overall cooling and heat dissipation efficiency of the rotor assembly 120.

[0046] Please refer to Figure 5 and Figure 6 The motor housing 110 is provided with a liquid flow pipeline 111, and the reducer housing 210 is provided with a stator pipeline 240. The two ends of the stator pipeline 240 are respectively connected with the outlet of the cooler 320 and the liquid flow pipeline 111. The liquid flow pipeline 111 is provided with a liquid flow port 112, and the liquid flow port 112 opens toward the inside of the motor housing 110. In this way, the coolant 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 liquid flow pipeline 111, and the liquid flow port 112, so as to cool and lubricate the stator assembly 130.

[0047] The motor assembly 100 is provided with a liquid collecting ring 140 at both ends along its length direction, and the coolant after cooling and lubricating the rotor assembly 120 and the stator assembly 130 flows into the two liquid collecting rings 140 respectively. A liquid return channel 420 connected to the reducer cavity 220 is also provided in the motor housing 110. In one embodiment, the liquid return channel 420 and the liquid flow pipeline 111 are respectively located on opposite sides of the motor housing 110. The two liquid collecting rings 140 are also connected to the liquid return channel 420. In this way, the coolant in the liquid collecting ring 140 flows back to the reducer cavity 220 through the liquid return channel 420 to participate in the next cooling cycle.

[0048] It is worth noting that the assembly relationship between the rotor assembly 120 , the stator assembly 130 and the liquid collecting ring 140 in the motor assembly 100 is prior art and will not be described in detail herein.

[0049] A technical solution of the present invention is to provide a motor assembly 100 and a reducer assembly 200 connected to each other in the electric drive assembly lubrication and cooling system, so that a part of the coolant in the reducer cavity 220 is supplied to the reducer assembly 200, so that the differential in the reducer cavity 220 splashes the liquid, so as to lubricate and cool the reducer assembly 200; the other part is filtered by the coarse filter 310 and flows into the cooler 320 through the liquid inlet channel 410 for cooling. A part of the cooled coolant enters the rotor assembly 120 through the rotor circulation channel, and the other part enters the stator assembly 130 through the stator circulation channel, so as to cool and lubricate the rotor assembly 120 and the stator assembly 130 respectively. The coolant after cooling and lubricating the rotor assembly 120 and the stator assembly 130 is collected in the liquid return channel 420, flows back to the reducer cavity 220 through the liquid return channel 420, and then participates in the next cooling and lubrication cycle. In this way, the coolant can lubricate and cool the reducer assembly 200, and can cool and lubricate the rotor assembly 120 and the stator assembly 130, thereby realizing the cooling and lubrication of the reducer assembly 200 and the motor assembly 100 by the coolant, realizing the cooling and lubrication of the overall structure of the electric drive assembly, improving the heat dissipation efficiency of the electric drive assembly, and improving the power density and efficiency of the electric drive assembly. At the same time, a return liquid channel 420 is also provided in the lubrication and cooling system of the electric drive assembly, so that the coolant after participating in the cooling and lubrication of the motor assembly 100 can flow back to the reducer cavity 220 through the return liquid channel 420 to participate in the next cooling and lubrication cycle, so that the coolant can be reused, and the use efficiency of the coolant is improved.

[0050] Please refer to Figure 2 and Figure 3 Furthermore, a liquid receiving plate 270 is provided in the reducer cavity 220, and a reserved hole 113 is provided in the stator circulation channel, and the reserved hole 113 is connected to the liquid receiving plate 270, so that the coolant in the stator circulation channel flows to the liquid receiving plate 270 through the reserved hole 113, and then flows into the reducer cavity 220.

[0051] Specifically, a reserved hole 113 is provided on the stator circulation channel. In one embodiment, the reserved hole 113 is provided on the liquid flow pipeline 111 of the motor housing 110. Generally, the reserved hole 113 is in a non-opened state. When the splashing of the differential stirring liquid cannot meet the lubrication demand of the reducer assembly 200, the reserved hole 113 can be opened to force lubrication and cooling of the reducer assembly 200. The reserved hole 113 can be set to other shapes such as a circle and an ellipse, and the shape and size of the reserved hole 113 are not limited here. A liquid receiving plate 270 is provided in the reducer cavity 220. After the reserved hole 113 is opened, the coolant in the liquid flow pipeline 111 can flow to the liquid receiving plate 270 through the reserved hole 113, and then flow from the liquid receiving plate 270 into the reducer cavity 220 to lubricate and cool the shaft, gear, bearing and other parts in the reducer cavity 220. The reserved hole 113 is provided on the liquid flow pipeline 111, and the reserved hole 113 can be connected to the liquid receiving plate 270 in the reducer cavity 220 after being opened. That is, as long as the coolant in the liquid flow pipeline 111 can flow into the reducer cavity 220 through the reserved hole 113 and the liquid receiving plate 270, the specific position of the reserved hole 113 on the liquid flow pipeline 111 is not limited. In one embodiment, the liquid receiving plate 270 is in a "V" shape, and the coolant from the liquid flow pipeline 111 can be temporarily stored at the angle of the "V" shape to stabilize the flow of the coolant. At the same time, the coolant on the liquid receiving plate 270 can be drained into the reducer cavity 220 through the angle to lubricate and cool the reducer assembly 200, and the position where the coolant flows into the reducer cavity 220 can be determined by setting the angle position and size of the liquid receiving plate 270. Of course, the liquid receiving plate 270 can also be in a "W" shape. Here, there is no restriction on the specific shape of the liquid receiving plate 270. The electric drive assembly lubrication and cooling system ensures that the motor assembly 100 is fully cooled, and at the same time, by setting the reserved hole 113, a forced lubrication structure for the reducer assembly 200 is reserved. When the splash lubrication of the differential in the reducer assembly 200 cannot meet the demand, the reserved hole 113 can be opened to realize the forced lubrication and cooling of the reducer assembly 200, further improving the heat dissipation efficiency of the electric drive assembly lubrication and cooling system.

[0052] Please refer to Figure 2 and Figure 3, further, an input shaft 510 and an intermediate shaft 520 are provided in the reducer cavity 220, and a liquid separation hole 271 is provided on the liquid receiving plate 270, and the coolant flows into the reducer cavity 220 through the liquid separation hole 271, and is supplied to the bearings of the input shaft 510 and the intermediate shaft 520. Specifically, the reducer cavity 220 is provided with a transmission-connected input shaft 510, an intermediate shaft 520 and an output shaft 530, and the input shaft 510 transmits the power of the motor assembly 100 to the intermediate shaft 520, and the intermediate shaft 520 transmits the power to the output shaft 530, and the output shaft 530 transmits the power to the wheels of the vehicle, thereby realizing the driving of the vehicle. For the convenience of explanation, the length direction of the input shaft 510 is defined as the length direction of the liquid receiving plate 270. The liquid receiving plate 270 is arranged above the input shaft 510 and the intermediate shaft 520. The liquid receiving plate 270 is provided with a liquid separation hole 271. The coolant flowing from the reserved hole 113 to the liquid receiving plate 270 is divided into two flow directions. A part of the coolant flows along the length direction of the liquid receiving plate 270 to the edge of the end of the liquid receiving plate 270 away from the motor assembly 100, and flows into the reducer cavity 220, which is used for differential stirring liquid splashing, replenishing splash lubrication coolant for the differential, and thus improving the effect of differential stirring liquid splash lubrication. The other part of the coolant flows to the bearings of the input shaft 510 and the bearings of the intermediate shaft 520 through the liquid separation hole 271 on the liquid receiving plate 270, so as to lubricate the bearings of the input shaft 510 and the bearings of the intermediate shaft 520, thereby improving the lubrication effect of the reducer assembly 200.

[0053] In the present invention, the electric drive assembly is placed vertically in the cabin, that is, the height direction of the electric drive assembly is consistent with the height direction of the vehicle. The vertical placement of the electric drive assembly reduces the installation space required for the electric drive assembly, saves the installation layout space in the cabin, and is conducive to the layout of the vehicle space. The electric drive assembly has a certain length and height, and the extension direction of the input shaft 510, the intermediate shaft 520 and the output shaft 530 is the length direction of the electric drive assembly, and the height direction of the electric drive assembly is perpendicular to its length direction. In the height direction of the electric drive assembly, the liquid receiving 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. In this way, when the differential is stirred and splashed, the lubrication effect of the output shaft 530 is better than that of the input shaft 510 and the intermediate shaft 520. The arrangement of the liquid separation hole 271 enables the coolant on the liquid receiving plate 270 to directly lubricate the input shaft 510 and the intermediate shaft 520 , thereby improving the lubrication effect of the input shaft 510 and the intermediate shaft 520 .

[0054] Please refer to Figure 3, further, the liquid separation hole 271 is located at one 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 arranged at one end of the reducer cavity 220 close to the motor housing 110, and the liquid separation hole 271 is arranged at one end of the liquid receiving plate 270 close to the motor assembly 100 along its length direction, so that the coolant flowing out of the liquid separation hole 271 can directly lubricate the bearing of the input shaft 510 and the bearing of the intermediate shaft 520, thereby improving the lubrication effect of the input shaft 510 and the intermediate shaft 520, and improving the lubrication and cooling efficiency of the reducer assembly 200.

[0055] Please refer to Figure 3 , further, the liquid receiving plate 270 and the reducer housing 210 are an integrally formed structure. Specifically, the reducer housing 210 includes a first reducer housing 211 close to the motor housing 110 and a second reducer housing 212 away from the motor housing 110. In one embodiment, the first reducer housing 211 and the motor housing 110 are an integrally formed structure. The liquid receiving plate 270 is arranged close to the first reducer housing 211 to facilitate communication with the reserved hole 113. In one embodiment, the liquid receiving plate 270 and the first reducer housing 211 are an integrally formed structure, that is, the liquid receiving plate 270 is fixed to the first reducer housing 211 along one end of its length direction toward the motor housing 110. The integrally formed structure of the liquid receiving plate 270 and the first reducer housing 211 facilitates the processing of the liquid receiving plate 270 and the first reducer housing 211, is beneficial to the connection stability and sealing between the liquid receiving plate 270 and the first reducer housing 211, avoids the overflow of the coolant from the connecting gap 251 between the liquid receiving plate 270 and the first reducer housing 211, and ensures the sealing of the flow path of the coolant.

[0056] Please refer to Figure 5 , further, the rotor assembly 120 includes a hollow rotor shaft 121, the reducer housing 210 is provided with a rotor pipeline 230, and the outlet of the cooler 320 is connected to the rotor shaft 121 through the rotor pipeline 230, so that the coolant in the cooler 320 flows into the rotor shaft 121 through the rotor pipeline 230. Specifically, the rotor shaft 121 is a hollow shaft, and a cavity is formed therein for the coolant to flow. The reducer housing 210 is provided with a rotor pipeline 230, and the two ends of the rotor pipeline 230 are respectively connected to the outlet of the coolant and one end of the rotor shaft 121 facing the reducer assembly 200. In this way, the coolant cooled by the cooler 320, the coolant flowing out of the outlet of the cooler 320 flows into the cavity of the rotor shaft 121 through the rotor pipeline 230, thereby realizing the introduction of cooling into the rotor assembly 120 to cool and lubricate the rotor assembly 120.

[0057] Please refer to Figure 5 and Figure 7Furthermore, a liquid guide tube 260 is provided between the rotor pipeline 230 and the rotor shaft 121. Specifically, in order to improve the connection sealing between the rotor pipeline 230 and the rotor shaft 121, a liquid guide tube 260 is provided between the two. In one embodiment, both ends of the liquid guide tube 260 along the length direction thereof extend into the cavities of the rotor pipeline 230 and the rotor shaft 121, respectively, and a sealing rib 261 is provided on the outer wall of the liquid guide tube 260. On the one hand, the sealing rib 261 can abut the edges of the rotor pipeline 230 and the rotor shaft 121 to achieve the connection between the liquid guide tube 260 and the rotor pipeline 230 and the rotor shaft 121; on the other hand, the sealing rib 261 can also prevent the coolant from flowing to the outer wall of the liquid guide tube 260, so that the coolant can only flow through the inside of the liquid guide tube 260, avoiding the flow of the coolant to the outside of the rotor pipeline 230 and the rotor shaft 121, thereby ensuring the flow sealing of the coolant; on the other hand, the setting 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 stress, and further avoids the failure of the connection sealing between the rotor pipeline 230 and the rotor shaft 121 after the liquid guide tube 260 is deformed. The sealing rib 261 is provided on the outer wall of the liquid guiding tube 260. In one embodiment, the sealing rib 261 includes an axial sealing rib 261 and a circumferential sealing rib 261. The circumferential sealing rib 261 is annularly sealed along the entire circumference of the liquid guiding tube 260 to abut against the rotor pipeline 230. The axial sealing rib 261 extends along the axial direction of the liquid guiding tube 260, and a plurality of axial sealing ribs 261 are arranged at intervals along the circumference of the liquid guiding tube 260 to abut against the rotor shaft 121. Of course, the sealing rib 261 can also be two circumferential sealing ribs 261, and the two sealing ribs 261 abut against the rotor pipeline 230 and the rotor shaft 121 respectively.

[0058] Please refer to Figure 5 and Figure 6 Furthermore, the electric drive assembly lubrication and cooling system also includes an electronic oil pump 330. A fine filter 340 is also provided on the outer wall of the reducer housing 210 at one end away from the motor assembly 100. The coarse filter 310 is connected to the inlet of the electronic oil pump 330 through the first liquid inlet branch 411. The outlet of the electronic oil pump 330 is connected to the inlet of the fine filter 340 through the second liquid inlet branch 412. The outlet of the fine filter 340 is connected to the inlet of the cooler 320 through the third liquid inlet branch 413. The first liquid inlet branch 411, the second liquid inlet branch 412 and the third liquid inlet branch 413 are connected in sequence to form a liquid inlet channel 410.

[0059] Specifically, the electric drive assembly lubrication and cooling system also includes an electronic oil pump 330 and a fine filter 340. The inlet of the electronic oil pump 330 is connected to the coarse filter 310 through the first liquid inlet branch 411. In this way, the coolant in the reducer cavity 220 filtered by the coarse filter 310 can be extracted and pressurized and then delivered to the fine filter 340 through the electronic oil pump 330. The fine filter 340 is connected to the outlet of the electronic oil pump 330 through the second liquid inlet branch 412 to filter the coolant for the second time, thereby improving the cleanliness of the coolant, providing clean coolant for the electric drive assembly, and avoiding damage to the electric drive assembly by impurities in the coolant. The coolant filtered by the fine filter 340 is connected to 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 lubrication effect of the coolant on the electric drive assembly. The first liquid inlet branch 411 , the second liquid inlet branch 412 and the third liquid inlet branch 413 are disposed in the motor housing 110 or the reducer housing 210 , and the three are sequentially connected to form a liquid inlet channel 410 .

[0060] Please refer to Figure 4 and Figure 5 Furthermore, a liquid baffle 250 is provided in the reducer cavity 220, and 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 provided in the liquid storage cavity 221, and a differential is provided in the liquid stirring cavity 222. The liquid baffle 250 is provided with a gap 251, and the coolant flows between the liquid storage cavity 221 and the liquid stirring cavity 222 through the gap 251.

[0061] Specifically, the electric drive assembly is placed vertically in the cabin to reduce its installation and layout space. However, the vertical placement makes it easy for the coolant to accumulate near the differential, making the differential's liquid stirring resistance relatively large. A liquid baffle 250 is provided in the reducer cavity 220, and the liquid baffle 250 divides the reducer cavity 220 into a liquid storage chamber 221 and a liquid stirring chamber 222. A coarse filter 310 is provided in the liquid storage chamber 221 to filter the coolant. A differential is provided in the liquid stirring chamber 222 to stir the liquid for splashing and lubrication. A gap 251 is provided on the liquid baffle 250, and the coolant can flow between the liquid storage chamber 221 and the liquid stirring chamber 222 through the gap 251. In this way, the setting of the liquid baffle 250 can make most of the coolant in the liquid storage chamber 221, thereby providing sufficient coolant for the electronic oil pump 330 to avoid empty suction of the electronic oil pump 330; a small part of the coolant is in the stirring chamber 222, so as to meet the splash lubrication of the differential stirring liquid while avoiding a large amount of coolant in the stirring chamber 222, which will cause greater resistance to the differential stirring liquid.

[0062] The present invention also proposes a vehicle, which includes an electric drive assembly lubrication and cooling system. The specific structure of the electric drive assembly lubrication and cooling system refers to the above-mentioned embodiments. Since this vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0063] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An electric drive assembly lubrication and cooling system, characterized in that: include: A motor assembly, comprising a motor housing, a rotor assembly and a stator assembly, wherein the rotor assembly and the stator assembly are arranged in the motor housing; as well as A reducer assembly is connected to the motor assembly, the reducer assembly includes a reducer housing, a reducer cavity is formed in the reducer housing, a coarse filter and a differential are arranged in the reducer cavity, the coarse filter is used to filter the coolant in the reducer cavity, the differential is used to stir and splash lubricate the coolant in the reducer cavity, and a cooler is arranged on the outer wall of the reducer housing at one end away from the motor assembly; The inlet of the cooler is communicated with the coarse filter through a liquid inlet channel, the outlet of the cooler is communicated with the rotor assembly through a rotor circulation channel, the outlet of the cooler is communicated with the stator assembly through a stator circulation channel, and the rotor assembly and the stator assembly are both communicated with the reducer cavity through a liquid return channel, so that the coolant in the reducer cavity flows through the liquid inlet channel, the stator circulation channel, and the rotor circulation channel, passes through the stator assembly and the rotor assembly, and then flows back to the reducer cavity through the liquid return channel; The up-down direction of the electric drive assembly is perpendicular to the axial direction of the motor assembly, and the motor assembly is located above the reducer assembly; A liquid receiving plate is provided in the reducer cavity, and a reserved hole is provided in the stator circulation channel. The reserved hole is connected to the liquid receiving plate, so that the coolant in the stator circulation channel flows through the reserved hole to the liquid receiving plate to flow into the reducer cavity.

2. The electric drive assembly lubrication and cooling system according to claim 1, characterized in that: An input shaft and an intermediate shaft are arranged in the reducer cavity, and a liquid separation hole is arranged on the liquid receiving plate. Coolant flows into the reducer cavity through the liquid separation hole and is supplied to the bearings of the input shaft and the intermediate shaft.

3. The electric drive assembly lubrication and cooling system according to claim 2, characterized in that: The liquid separation hole is located at one end of the liquid receiving plate facing the motor assembly.

4. The electric drive assembly lubrication and cooling system according to claim 3, characterized in that: The liquid receiving plate and the reducer housing are integrally formed.

5. The electric drive assembly lubrication and cooling system according to claim 1, characterized in that: The rotor assembly includes a hollow rotor shaft, the reducer housing is provided with a rotor pipeline, and the outlet of the cooler is connected to the rotor shaft through the rotor pipeline, so that the coolant in the cooler flows into the rotor shaft through the rotor pipeline.

6. The electric drive assembly lubrication and cooling system according to claim 5, characterized in that: A liquid guide tube is provided between the rotor pipeline and the rotor shaft.

7. The electric drive assembly lubrication and cooling system according to claim 1, characterized in that: The electric drive assembly lubrication and cooling system also includes an electronic oil pump. A fine filter is also provided on the outer wall of the reducer housing at one end away from the motor assembly. The coarse filter is connected to the inlet of the electronic oil pump through a first liquid inlet branch, and the outlet of the electronic oil pump is connected to the inlet of the fine filter through a second liquid inlet branch. The outlet of the fine filter is connected to the inlet of the cooler through a third liquid inlet branch. The first liquid inlet branch, the second liquid inlet branch and the third liquid inlet branch are connected in sequence to form the liquid inlet channel.

8. The electric drive assembly lubrication and cooling system according to any one of claims 1 to 7, characterized in that: A liquid baffle is provided in the reducer cavity, and the liquid baffle divides the reducer cavity into a liquid storage cavity and a liquid stirring cavity. The coarse filter is provided in the liquid storage cavity, and the differential is provided in the liquid stirring cavity. The liquid baffle is provided with a gap, and the coolant flows between the liquid storage cavity and the liquid stirring cavity through the gap.

9. A vehicle, characterized in that: It comprises the electric drive assembly lubrication and cooling system as claimed in any one of claims 1 to 8.

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