Lubricating structure of electric drive system, electric drive system and vehicle

Abstract

The invention provides a lubricating structure of an electric drive system, the electric drive system and a vehicle. The lubricating structure comprises an oil pumping pipeline, a lubricating oil pump, a lubricating oil pump and a lubricating oil pump, wherein an oil inlet of the oil pumping pipeline is communicated with an oil pan in a speed reducer shell; the first oil duct is arranged on the speed reducer shell, an inlet of the first oil duct is communicated with an oil outlet of the oil pumping pipeline, a first outlet of the first oil duct is opposite to the differential shell, and the differential shell is provided with a lubricating window; the second oil duct is arranged on a second gear shaft of the second planet row, the second planet row is arranged in the differential mechanism shell, an inlet of the second oil duct is arranged close to the lubricating window, and an outlet of the second oil duct is communicated with a first gap between the second gear shaft and the second planet gear; the width of the second gear ring of the second planet row is larger than that of the second planet gear. According to the scheme, the technical problem of how to improve the cooling and lubricating effects of the coaxial speed reducer is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reducer lubrication, in particular to a lubricating structure of an electric drive system, the electric drive system and a vehicle. BACKGROUND

[0002] The electric drive system comprises a reducer and a motor, and the reducer in the industry mainly adopts splash lubrication, that is, the lubricating oil is splashed to other parts needing lubrication through the rotating parts inside the reducer. For the coaxial reducer, this lubrication method makes almost all rotating parts immersed in the lubricating oil, which increases the oil stirring loss and reduces the system efficiency.

[0003] In particular, the internal structure of the planetary gear system is complex, and the centrifugal force generated by revolution makes it difficult for the lubricating oil to be uniformly distributed, especially to reach the center of the planetary gear system, resulting in insufficient lubrication. During vehicle operation, the planetary gear transmission system is prone to rapid temperature rise due to poor lubrication, which not only affects the service life of the reducer, but also may cause safety problems of the vehicle.

[0004] At present, there is no effective solution to the technical problem of how to improve the cooling and lubrication effect of the coaxial reducer. SUMMARY

[0005] The main purpose of the present application is to provide a lubricating structure of an electric drive system, the electric drive system and a vehicle, to solve the technical problem of how to improve the cooling and lubrication effect of the coaxial reducer.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a lubricating structure of an electric drive system is provided, the electric drive system comprising a reducer housing, a motor housing, a first planetary gear, a second planetary gear, a differential housing, an intermediate shaft, a rotor shaft and a thrust bearing, the lubricating structure comprising: a pump oil line, an oil inlet of the pump oil line being in communication with an oil pan in the reducer housing; a first oil passage, the first oil passage being provided on the reducer housing, an inlet of the first oil passage being in communication with an oil outlet of the pump oil line, a first outlet of the first oil passage being oppositely arranged with the differential housing, the differential housing being provided with a lubrication window; a second oil passage, the second oil passage being provided on a second gear shaft of the second planetary gear, the second planetary gear being arranged in the differential housing, an inlet of the second oil passage being arranged close to the lubrication window, an outlet of the second oil passage being in communication with a first gap between the second gear shaft and the second planetary gear; wherein the width of the second ring gear of the second planetary gear is greater than the width of the second planetary gear.

[0007] Further, the differential housing is provided with a guide plate, the guide plate being arranged along the circumference of the differential housing, a guide oil passage being formed between the guide plate and the differential housing, one end of the guide oil passage being in communication with the second oil passage, the other end of the guide oil passage being arranged close to the lubrication window, so as to collect the oil splashed from the differential housing.

[0008] Further, the first oil passage is provided with a second outlet, and the second outlet is arranged close to the differential tail end bearing, the differential tail end oil seal and the differential tail end spiral oil groove.

[0009] Further, the motor housing is connected with the reducer housing, the motor housing is provided with a first support plate, the first planet carrier of the first planetary gear set is rotatably connected with the first support plate through a first bearing, and the lubricating structure further comprises: a third oil passage, the third oil passage is arranged on the reducer housing and the motor housing, an inlet of the third oil passage is in communication with the oil outlet of the pump oil pipeline, and a third outlet of the third oil passage is in communication with a second gap between the inner ring of the first bearing and the outer ring of the first bearing; and a fourth oil passage, the fourth oil passage is arranged on the first planet carrier and a first gear shaft of the first planetary gear set, an inlet of the fourth oil passage is in communication with the second gap, and an outlet of the fourth oil passage is in communication with a third gap between the first gear shaft and the first planet wheel.

[0010] Further, the first planet carrier is provided with an oil blocking protrusion, the oil blocking protrusion is arranged close to the inlet of the fourth oil passage, and the oil blocking protrusion is arranged opposite to the end face of the first bearing.

[0011] Further, the third oil passage is provided with a fourth outlet, the fourth outlet is arranged close to the inner ring of the first bearing, and the fourth outlet is arranged opposite to the meshing position of the first sun gear and the first planet wheel of the first planetary gear set.

[0012] Further, part of the first sun gear extends into the second sun gear of the second planetary gear set.

[0013] Further, the second sun gear has a through cavity, the through cavity extends along the axial direction of the second sun gear, at least part of the through cavity is in a tapered structure, and the cavity diameter of the through cavity is arranged to increase away from the first sun gear.

[0014] Further, the rotor shaft sleeve is arranged outside the intermediate shaft, a first annular channel is formed between the rotor shaft and the intermediate shaft, a second annular channel is formed between the first sun gear of the first planetary gear set and the intermediate shaft, and a third annular channel is formed between the second sun gear of the second planetary gear set and the intermediate shaft, and the lubricating structure further comprises: a fifth oil passage, the fifth oil passage is arranged on the reducer housing and the motor housing, an inlet of the fifth oil passage is in communication with the oil outlet of the pump oil pipeline, and an outlet of the fifth oil passage is in communication with the first annular channel, the second annular channel and the third annular channel in sequence.

[0015] Further, the inner wall of the first sun gear is provided with a first spiral oil groove, and the first spiral oil groove extends along the axial direction of the first sun gear.

[0016] According to another aspect of the present application, an electric drive system is provided, and the electric drive system comprises the above lubricating structure.

[0017] According to another aspect of the present application, a vehicle is provided, which comprises the electric drive system described above.

[0018] According to the technical scheme of the present application, the lubricating oil in the oil sump enters the first oil passage through the oil pump pipeline, part of the lubricating oil in the first oil passage enters the differential housing through the lubricating window, and lubricates the inside of the differential; part of the lubricating oil in the first oil passage splashes due to impact with the differential housing, the splashed lubricating oil enters the second oil passage, and the lubricating oil in the second oil passage centrifugally moves to the first gap between the second gear shaft and the second planetary gear through the revolution and revolution of the second planetary gear, lubricates the needle bearing between the second gear shaft and the second planetary gear and the end face of the second planetary gear; the lubricating oil flows to the second ring gear through the end face of the second planetary gear under the action of centrifugal force, lubricates the meshing pair composed of the second planetary gear and the second ring gear, and since the width of the second ring gear of the second planetary gear set is greater than the width of the second planetary gear, the second ring gear can further collect lubricating oil, increase the lubricating amount in the second ring gear, and further fully lubricate the meshing pair composed of the second planetary gear and the second ring gear. The lubricating structure in the above scheme utilizes the centrifugal force generated by the rotation of the second planetary gear set to lubricate each rotating component of the second planetary gear set from the inside to the outside, thereby improving the cooling and lubricating effect of the coaxial reducer. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, make an explanation of the application complete, and are not intended to limit the application unduly. In the drawings:

[0020] Figure 1 A flow path schematic diagram of each oil passage of the lubricating structure in the present application is shown;

[0021] Figure 2 A schematic diagram of the lubricating structure in the present application is shown;

[0022] Figure 3 A schematic diagram of the positional relationship between the first sun gear and the second sun gear in the present application is shown;

[0023] Figure 4 A schematic diagram of the positional relationship between the third oil passage and the first bearing in the present application is shown;

[0024] Figure 5 A schematic diagram of the positional relationship between the differential and the second planetary gear set in the present application is shown.

[0025] Among them, the above drawings include the following reference signs:

[0026] 1, reducer housing;

[0027] 2, motor housing; 21, first support plate; 22, second support plate;

[0028] 3, first planetary gear train; 31, first gear shaft; 32, first planetary gear; 33, first planetary carrier; 331, oil retaining bump; 34, first sun gear; 341, first spiral oil groove; 35, first ring gear;

[0029] 4, second planetary gear train; 41, second gear shaft; 42, second planetary gear; 43, second sun gear; 44, second ring gear;

[0030] 5, differential housing; 51, lubrication window; 52, oil guide plate; 53, oil guide channel; 54, differential tail end bearing; 55, differential tail end oil seal; 56, differential tail end spiral oil groove;

[0031] 6, intermediate shaft;

[0032] 7, rotor shaft;

[0033] 9, thrust bearing;

[0034] 10, first bearing;

[0035] 100, pump oil line; 101, oil pump; 102, cooler;

[0036] 200, first oil channel; 201, first outlet; 202, second outlet;

[0037] 300, second oil channel;

[0038] 400, third oil channel; 401, third outlet; 402, fourth outlet;

[0039] 500, fourth oil channel;

[0040] 600, fifth oil channel;

[0041] 700, first annular passage;

[0042] 800, second annular passage;

[0043] 900, third annular passage. DETAILED DESCRIPTION

[0044] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0046] It is to be understood that the terms "first", "second", and the like, used herein do not necessarily connote any order, quantity, composition or importance, but are used to distinguish one element from another, and do not necessarily indicate a requirement or order. It is further understood that any terms used herein - including technical terms - are understood to have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains unless otherwise specifically defined herein. It is further to be understood that any terms used herein should be interpreted as having a frequency-dependent meaning. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein is intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0047] In accordance with example embodiments of the present application, there is provided a lubrication structure of an electric drive system.

[0048] In accordance with example embodiments of the present application, there is provided a lubrication structure of an electric drive system. Figures 1 to 5 In accordance with example embodiments of the present application, there is provided a lubrication structure of an electric drive system.

[0049] Specifically, the electric drive system comprises a reducer housing 1, a motor housing 2, a first planetary gear set 3, a second planetary gear set 4, a differential housing 5, an intermediate shaft 6, a rotor shaft 7 and a thrust bearing 9. The lubricating structure of the electric drive system comprises a pump oil pipeline 100, a first oil channel 200 and a second oil channel 300. The oil inlet of the pump oil pipeline 100 is in communication with an oil pan in the reducer housing 1. The first oil channel 200 is arranged on the reducer housing 1, the inlet of the first oil channel 200 is in communication with the oil outlet of the pump oil pipeline 100, the first outlet 201 of the first oil channel 200 is arranged opposite to the differential housing 5, and the differential housing 5 is provided with a lubricating window 51. The second oil channel 300 is arranged on a second gear shaft 41 of the second planetary gear set 4, the second planetary gear set 4 is arranged in the differential housing 5, the inlet of the second oil channel 300 is arranged close to the lubricating window 51, and the outlet of the second oil channel 300 is in communication with a first gap between the second gear shaft 41 and a second planetary gear 42. The width of a second ring gear 44 of the second planetary gear set 4 is greater than the width of the second planetary gear 42.

[0050] In the embodiment of the present application, the lubricating oil in the oil pan enters the first oil channel 200 through the pump oil pipeline 100, part of the lubricating oil in the first oil channel 200 enters the differential housing 5 through the lubricating window 51 to lubricate the inside of the differential; part of the lubricating oil in the first oil channel 200 splashes due to the impact of the differential housing 5, the splashed lubricating oil enters the second oil channel 300, the lubricating oil in the second oil channel 300 moves centrifugally through the rotation and revolution of the second planetary gear 42, and flows to the first gap between the second gear shaft 41 and the second planetary gear 42 to lubricate the needle bearing between the second gear shaft 41 and the second planetary gear 42 and the end face of the second planetary gear 42; under the action of centrifugal force, the lubricating oil flows to the second ring gear 44 through the end face of the second planetary gear 42 to lubricate the meshing pair composed of the second planetary gear 42 and the second ring gear 44, and since the width of the second ring gear 44 of the second planetary gear set 4 is greater than the width of the second planetary gear 42, the second ring gear 44 can further collect the lubricating oil and increase the amount of lubricating oil in the second ring gear 44, thereby fully lubricating the meshing pair composed of the second planetary gear 42 and the second ring gear 44. The lubricating structure in the above scheme utilizes the centrifugal force generated by the rotation of the second planetary gear set 4 to perform a certain point lubrication on each rotating component of the second planetary gear set 4 from the inside to the outside, thereby improving the cooling and lubricating effect of the coaxial reducer.

[0051] In an exemplary embodiment of the present application, as shown in Figure 1 、 Figure 2 、 Figure 5As shown, the oil inlet of the pump oil line 100 is communicated with the oil pan in the reducer housing 1, and the pump oil line 100 is provided with an oil pump 101 and a cooler 102, and the lubricating oil in the pump oil line 100 is cooled through the cooler 102. The first oil passage 200 is arranged on the reducer housing 1, the inlet of the first oil passage 200 is communicated with the oil outlet of the pump oil line 100, so that the pump oil line 100 supplies oil for the first oil passage 200, and the first outlet 201 of the first oil passage 200 is arranged opposite to the differential housing 5; the differential housing 5 is provided with two lubricating windows 51, and the two lubricating windows 51 are arranged along the circumference of the differential housing 5, and the lubricating window 51 has a first position opposite to the first outlet 201 in the differential rotation process, and the lubricating window 51 has a second position non-opposite to the first outlet 201; when the lubricating window 51 is opposite to the first outlet 201, the lubricating oil in the first oil passage 200 can enter the differential housing 5 through the lubricating window 51; when the lubricating window 51 is non-opposite to the first outlet 201, the lubricating oil in the first oil passage 200 collides with the differential housing 5, and then the lubricating oil splashes.

[0052] As shown in Figure 1 , Figure 2 , the second planetary gear set 4 is integrated with the differential, that is, the second planetary gear set 4 is arranged in the differential housing 5. The second oil passage 300 is arranged on the second gear shaft 41 of the second planetary gear set 4, and the second oil passage 300 includes a first component segment and a second component segment. The first component segment is a blind hole arranged along the axis of the second gear shaft 41, and one end of the first component segment close to the lubricating window 51 is communicated with the outside. The second component segment is a through hole extending along the radial direction of the second gear shaft 41, one end of the second component segment is communicated with the first component segment, and the other end of the second component segment is communicated with the outside. The second component segment is multiple, and the multiple second component segments are arranged along the circumference and the axial direction of the second gear shaft 41. The lubricating oil splashed by the differential housing 5 first enters the first component segment of the second oil passage 300, and under the action of centrifugal force, the lubricating oil flows into the first gap between the second gear shaft 41 and the second planetary gear 42 through the second component segment, lubricating the needle bearing located between the second gear shaft 41 and the second planetary gear 42 and the end face of the second planetary gear 42. Under the action of centrifugal force, the lubricating oil flows into the second ring gear 44 through the end face of the second planetary gear 42, lubricating the meshing pair composed of the second planetary gear 42 and the second ring gear 44. The width of the second ring gear 44 of the second planetary gear set 4 is greater than the width of the second planetary gear 42, and the second ring gear 44 can further collect the lubricating oil, increase the amount of lubricating oil in the second ring gear 44, and then fully lubricate the meshing pair composed of the second planetary gear 42 and the second ring gear 44.

[0053] It should be noted that Figure 1 the arrow direction in the figure is the flow direction of the lubricating oil.

[0054] Further, the differential housing 5 is provided with an oil guide plate 52, the oil guide plate 52 is arranged along the circumference of the differential housing 5, and an oil guide oil channel 53 is formed between the oil guide plate 52 and the differential housing 5, one end of the oil guide oil channel 53 is communicated with the second oil channel 300, and the other end of the oil guide oil channel 53 is arranged close to the lubricating window 51 to collect the oil splashed from the surface of the differential housing 5.

[0055] In the embodiment of the present application, the arrangement of the oil guide plate 52 can effectively collect the oil splashed from the surface of the differential housing 5, compared with directly splashing the oil, the oil guide plate 52 can more accurately control the flow path of the lubricating oil, so that the splashed oil flows into the interior of the second planetary gear set 4 through the second oil channel 300 to lubricate the second planetary gear set 4, thereby avoiding the waste of lubricating oil and improving the utilization rate of lubricating oil.

[0056] As shown in Figure 1 , Figure 2 , Figure 5 , along the direction from the differential to the second planetary gear set 4, the oil guide plate 52 is arranged obliquely from inside to outside, and the oil guide plate 52 is arranged along the circumference of the differential housing 5 to form a tapered oil guide oil channel 53 around the oil guide plate 52. The oil guide plate 52 is arranged obliquely to enable the lubricating oil splashed on the oil guide plate 52 to smoothly enter the second oil channel 300.

[0057] Further, the first oil channel 200 is provided with a second outlet 202, and the second outlet 202 is arranged close to the differential tail end bearing 54, the differential tail end oil seal 55 and the differential tail end spiral oil groove 56.

[0058] In the embodiment of the present application, during the driving of the vehicle, the differential tail end bearing 54, the differential tail end oil seal 55 and the differential tail end spiral oil groove 56 bear high mechanical stress and heat accumulation, and the lubricating oil in the first oil channel 200 is sprayed to the differential tail end through the second outlet 202 to rapidly reduce the temperature of these parts, reduce wear and tear, and improve the stability and service life of the parts. In addition, the first oil channel 200 is provided with two outlets to realize synchronous lubrication and cooling of two parts of the electric drive system, and the structure is simple and compact.

[0059] Further, the motor housing 2 is connected with the reducer housing 1, the motor housing 2 is provided with a first support plate 21, the first planetary carrier 33 of the first planetary gear set 3 is rotatably connected with the first support plate 21 through the first bearing 10, and the lubricating structure further comprises a third oil channel 400 and a fourth oil channel 500. The third oil channel 400 is arranged on the reducer housing 1 and the motor housing 2, an inlet of the third oil channel 400 is in communication with the oil outlet of the pump oil pipeline 100, and a third outlet 401 of the third oil channel 400 is in communication with a second gap between the inner ring of the first bearing 10 and the outer ring of the first bearing 10. The fourth oil channel 500 is arranged on the first planetary carrier 33 and the first gear shaft 31 of the first planetary gear set 3, an inlet of the fourth oil channel 500 is in communication with the second gap, and an outlet of the fourth oil channel 500 is in communication with a third gap between the first gear shaft 31 and the first planetary gear 32.

[0060] In the embodiment of the application, part of the lubricating oil in the pump oil pipeline 100 flows into the third oil channel 400, the third outlet 401 of the third oil channel 400 is arranged between the inner and outer rings of the first bearing 10, so that the lubricating oil in the third oil channel 400 flows into the first planetary gear set 3 through the second gap between the inner and outer rings of the first bearing 10; the fourth oil channel 500 is arranged on the first planetary carrier 33 and the first gear shaft 31, the lubricating oil flowing into the first planetary gear set 3 through the second gap flows to the third gap between the first gear shaft 31 and the first planetary gear 32 through the fourth oil channel 500; under the action of centrifugal force, the lubricating oil in the third gap continues to be thrown outward to the space between the first ring gear 35 and the first planetary gear 32, so as to lubricate the meshing pair composed of the first ring gear 35 and the first planetary gear 32. By using the centrifugal force generated by the rotation of the first planetary gear set 3, the lubricating oil is point-lubricated to the rotating components in the first planetary gear set 3 from inside to outside, thereby improving the cooling and lubricating effect of the coaxial reducer.

[0061] In one exemplary embodiment of the application, as Figure 1 、 Figure 2 、 Figure 4As shown, the motor housing 2 is axially butted with the reducer housing 1, the motor housing 2 is provided with a first support plate 21 and a second support plate 22, the first support plate 21 and the second support plate 22 are arranged axially spaced, the first support plate 21 is arranged close to the reducer housing 1, and the second support plate 22 is arranged away from the reducer housing 1; wherein the first support plate 21 is used to support the first planetary gear set 3 and the rotor shaft 7, and the second support plate 22 is used to support the intermediate shaft 6 and the rotor shaft 7, and the first carrier 33 of the first planetary gear set 3 is rotatably connected with the first support plate 21 through the first bearing 10. The third oil channel 400 is arranged on the reducer housing 1 and the motor housing 2, part of the third oil channel 400 is arranged on the first support plate 21, the third outlet 401 of the third oil channel 400 is communicated with the second gap between the inner ring of the first bearing 10 and the outer ring of the first bearing 10, part of the lubricating oil in the pump oil circuit 100 flows into the third oil channel 400, and the lubricating oil in the third oil channel 400 flows into the first planetary gear set 3 through the second gap between the inner and outer rings of the first bearing 10.

[0062] The fourth oil channel 500 is arranged on the first carrier 33 and the first gear shaft 31 of the first planetary gear set 3, the fourth oil channel 500 includes a third component segment, a fourth component segment and a fifth component segment, part of the third component segment is formed on the first carrier 33, and part of the third component segment is formed on the first gear shaft 31, the third component segment is arranged in the radial direction, the fourth component segment is a blind hole formed on the first gear shaft 31, the fourth component segment is arranged in the axial direction of the first gear shaft 31, one end of the fourth component segment is communicated with the third component segment, the fifth component segment is arranged in the radial direction of the first gear shaft 31, one end of the fifth component segment is communicated with the fourth component segment, and the other end of the fifth component segment is communicated with the third gap between the first gear shaft 31 and the first planetary gear 32, the fifth component segment is multiple, and the multiple fifth component segments are arranged spaced apart in the circumferential direction and the axial direction of the first gear shaft 31.

[0063] It should be noted that, Figure 1 The arrow direction in the figure is the flow direction of the lubricating oil.

[0064] Further, the first carrier 33 is provided with an oil blocking protrusion 331, the oil blocking protrusion 331 is arranged close to the inlet of the fourth oil channel 500, and the oil blocking protrusion 331 is arranged opposite to the end face of the first bearing 10.

[0065] In the embodiment of the present application, the oil blocking protrusion 331 is arranged opposite to the end face of the first bearing 10 to block the lubricating oil splashed from the first bearing 10, to guide the lubricating oil to flow into the fourth oil channel 500, thereby increasing the lubricating amount in the fourth oil channel 500, and the internal part of the first planetary gear set 3 can be fully lubricated.

[0066] As Figure 4As shown, the oil blocking protrusion 331 is integrally formed on the first carrier 33, and the oil blocking protrusion 331 is arranged opposite to the end face of the first bearing 10, so that an oil blocking space is formed between the oil blocking protrusion 331 and the first bearing 10, that is, the lubricating oil splashed from the first bearing 10 is blocked in the oil blocking space, and under the action of centrifugal force, flows into the fourth oil channel 500.

[0067] Further, the third oil channel 400 is provided with a fourth outlet 402, which is arranged close to the inner ring of the first bearing 10, and the fourth outlet 402 is arranged opposite to the meshing position of the first sun gear 34 and the first planetary gear 32 of the first planetary gear set 3.

[0068] In the embodiment of the present application, part of the lubricating oil in the third oil channel 400 flows to the first sun gear 34 and the first planetary gear 32 through the fourth outlet 402, and then lubricates the gear pair composed of the first sun gear 34 and the first planetary gear 32. At the same time, the third oil channel 400 realizes synchronous lubrication and cooling of two parts of the electric drive system by arranging two outlets, and the structure is simple and compact.

[0069] Further, as shown, Figure 3 Part of the first sun gear 34 extends into the second sun gear 43 of the second planetary gear set 4. In the embodiment of the present application, part of the first sun gear 34 extends into the second sun gear 43, and the lubricating oil splashed from between the first sun gear 34 and the first planetary gear 32 can enter the second sun gear 43, and under the action of centrifugal force, the lubricating oil in the second sun gear 43 is thrown out at the end face of the second sun gear 43, and then lubricates the thrust bearing 9 at the end of the second sun gear 43.

[0070] Further, the second sun gear 43 has a through cavity, which is arranged in the axial direction of the second sun gear 43, and at least part of the through cavity is in a tapered structure, and the cavity diameter of the through cavity is arranged to increase away from the first sun gear 34.

[0071] In the embodiment of the present application, the through cavity of the second sun gear 43 is arranged in a tapered structure, and the cavity diameter of the through cavity is arranged to increase away from the first sun gear 34, that is, under the action of centrifugal force, the lubricating oil of the second sun gear 43 flows away from the first sun gear 34, that is, the lubricating oil of the second sun gear 43 flows out of the through cavity to lubricate the thrust bearing 9 at the end of the second sun gear 43.

[0072] As can be understood, Figure 1 , Figure 2 As shown, the inner diameter of the side of the second sun gear 43 away from the first sun gear 34 is less than or equal to the inner diameter of the thrust bearing 9, so that the lubricating oil flowing out of the through cavity of the second sun gear 43 can smoothly lubricate the thrust bearing 9.

[0073] Further, as shown,Figure 1 , Figure 2 As shown, the right end of the second planetary gear 42 protrudes to the right end face of the second sun gear 43. The lubricating oil thrown out from the thrust bearing 9 flows to the tooth surface of the second planetary gear 42 after passing through the right end face of the second sun gear 43, thereby lubricating the gear pair composed of the second planetary gear and the second sun gear 43.

[0074] Furthermore, the rotor shaft 7 is sleeved outside the intermediate shaft 6, forming a first annular channel 700 between the rotor shaft 7 and the intermediate shaft 6. A second annular channel 800 is formed between the first sun gear 34 of the first planetary gear set 3 and the intermediate shaft 6. A third annular channel 900 is formed between the second sun gear 43 of the second planetary gear set 4 and the intermediate shaft 6. The lubrication structure also includes a fifth oil passage 600, which is located on the reducer housing 1 and the motor housing 2. The inlet of the fifth oil passage 600 is connected to the outlet of the oil pump pipeline 100, and the outlet of the fifth oil passage 600 is connected to the first annular channel 700, the second annular channel 800, and the third annular channel 900 in sequence.

[0075] In the embodiments of this application, the fifth oil passage 600 is connected to the first annular channel 700, the second annular channel 800 and the third annular channel 900 to guide the lubricating oil in the fifth oil passage 600 to the space between the second sun gear 43 and the intermediate shaft 6. Under the action of centrifugal force, the lubricating oil in the second sun gear 43 is thrown out to the end face of the second sun gear 43, thereby lubricating the thrust bearing 9 at the end of the second sun gear 43.

[0076] like Figure 1 As shown, two oil channels converge within the through cavity of the second sun gear 43. One channel carries lubricating oil flowing in from the first annular channel 700, while the other channel carries lubricating oil splashed out between the first sun gear 34 and the first planetary gear 32. This ensures sufficient lubrication of the thrust bearing 9 at the right end of the second sun gear 43. Furthermore, a first spiral oil groove 341 is provided on the inner wall of the first sun gear 34, extending axially along the first sun gear 34.

[0077] In the embodiments of this application, the first spiral oil groove 341 is provided to facilitate the outward spiraling of lubricating oil between the first sun gear 34 and the intermediate shaft 6 into the second sun gear 43.

[0078] According to another specific embodiment of this application, an electric drive system is provided, which includes the lubrication structure in the above embodiments.

[0079] According to another specific embodiment of this application, a vehicle is provided, the vehicle including the electric drive system of the above embodiments.

[0080] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof (e.g., "vertical ly", "horizontal ly", etc.) can refer to the relative positions of an apparatus or feature as shown in the drawings, and shall not be construed as limiting the present application to any particular spatial orientation. Furthermore, the terms "first", "second", third", etc. merely identify one of a number of similar features or steps in an embodiment, and are not intended to denote a spatial or chronological priority of such features or steps to one another. The terms "comprise", "comprising", "include", "including", and the like, as used herein, are specifically intended to be construed as open-ended terms (i.e., the terms do not exclude the presence of other elements or steps). It is specifically intended that any total number or range of steps or components to be

[0081] In addition, it should be understood that any numerical range recited herein includes all values from the lower and upper limits of that range. For example, if a concentration range is stated as 1% to 50%, it is intended that values ranging from 1% to 50%, such as 20%, are expressly enumerated. It is also understood that the endpoints of the ranges are not significant and are intended to be merely approximate. It is also understood that the description is not limited in scope to the specific embodiments described herein, which are intended for illustrative purposes only. Any change of numerical limitations, such as concentration ranges, temperature ranges, etc., are intended to be included in the scope of the present application.

[0082] In the above embodiments, the description of each embodiment is focused on a certain aspect, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0083] The above description is only preferred embodiments of the present application, and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A lubrication structure for an electric drive system, the electric drive system comprising a reducer housing (1), a motor housing (2), a first planetary gear set (3), a second planetary gear set (4), a differential housing (5), an intermediate shaft (6), a rotor shaft (7), and a thrust bearing (9), characterized in that, The lubrication structure includes: Oil pump line (100), the oil inlet of the oil pump line (100) is connected to the oil pan inside the reducer housing (1); The first oil passage (200) is located on the reducer housing (1). The inlet of the first oil passage (200) is connected to the outlet of the oil pump pipeline (100). The first outlet (201) of the first oil passage (200) is opposite to the differential housing (5). The differential housing (5) is provided with a lubrication window (51). The second oil passage (300) is located on the second gear shaft (41) of the second planetary gear set (4). The second planetary gear set (4) is located inside the differential housing (5). The inlet of the second oil passage (300) is located near the lubrication window (51). The outlet of the second oil passage (300) is connected to the first gap between the second gear shaft (41) and the second planetary gear (42). The width of the second gear ring (44) of the second planetary gear (4) is greater than the width of the second planetary gear (42).

2. The lubrication structure of the electric drive system according to claim 1, characterized in that, The differential housing (5) is provided with an oil guide plate, which extends circumferentially along the differential housing (5). An oil guide passage (53) is formed between the oil guide plate and the differential housing (5). One end of the oil guide passage (53) is connected to the second oil passage (300), and the other end of the oil guide passage (53) is located near the lubrication window (51) to collect the oil splashed from the differential housing (5).

3. The lubrication structure of the electric drive system according to claim 1 or 2, characterized in that, The first oil passage (200) is provided with a second outlet (202), which is located near the differential tail bearing (54), the differential tail oil seal (55) and the differential tail spiral oil groove (56).

4. The lubrication structure of the electric drive system according to claim 1, characterized in that, The motor housing (2) is connected to the reducer housing (1). The motor housing (2) is provided with a first support plate (21). The first planetary carrier (33) of the first planetary gear set (3) is rotatably connected to the first support plate (21) through a first bearing (10). The lubrication structure further includes: The third oil passage (400) is provided on the reducer housing (1) and the motor housing (2). The inlet of the third oil passage (400) is connected to the outlet of the pump oil pipeline (100). The third outlet (401) of the third oil passage (400) is connected to the second gap between the inner ring of the first bearing (10) and the outer ring of the first bearing (10). The fourth oil passage (500) is located on the first gear shaft (31) of the first planetary carrier (33) and the first planetary gear (3). The inlet of the fourth oil passage (500) is connected to the second gap, and the outlet of the fourth oil passage (500) is connected to the third gap between the first gear shaft (31) and the first planetary gear (32).

5. The lubrication structure of the electric drive system according to claim 4, characterized in that, The first planetary carrier (33) is provided with an oil-blocking protrusion (331), which is located near the inlet of the fourth oil passage (500) and is positioned opposite to the end face of the first bearing (10).

6. The lubrication structure of the electric drive system according to claim 4 or 5, characterized in that, The third oil passage (400) is provided with a fourth outlet (402), which is located near the inner ring of the first bearing (10) and is positioned opposite to the meshing position of the first sun gear (34) and the first planet gear (32) of the first planetary gear set (3).

7. The lubrication structure of the electric drive system according to claim 6, characterized in that, Part of the first sun wheel (34) extends into the second sun wheel (43) of the second planetary array (4).

8. The lubrication structure of the electric drive system according to claim 7, characterized in that, The second sun gear (43) has a through cavity that extends along the axial direction of the second sun gear (43). At least a portion of the through cavity has a conical structure, and the diameter of the through cavity increases progressively away from the first sun gear (34).

9. The lubrication structure of the electric drive system according to claim 4, characterized in that, The rotor shaft (7) is sleeved on the outside of the intermediate shaft (6), and a first annular channel (700) is formed between the rotor shaft (7) and the intermediate shaft (6). A second annular channel (800) is formed between the first sun gear (34) of the first planetary gear set (3) and the intermediate shaft (6). A third annular channel (900) is formed between the second sun gear (43) of the second planetary gear set (4) and the intermediate shaft (6). The lubrication structure further includes: The fifth oil passage (600) is located on the reducer housing (1) and the motor housing (2). The inlet of the fifth oil passage (600) is connected to the outlet of the pump oil pipeline (100). The outlet of the fifth oil passage (600) is connected to the first annular channel (700), the second annular channel (800) and the third annular channel (900) in sequence.

10. The lubrication structure of the electric drive system according to claim 9, characterized in that, The inner wall of the first sun gear (34) is provided with a first spiral oil groove (341), which extends along the axial direction of the first sun gear (34).

11. An electric drive system, characterized in that, The electric drive system includes the lubrication structure according to any one of claims 1-10.

12. A vehicle, characterized in that, The vehicle includes the electric drive system as described in claim 11.

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