Electric drive assembly

Abstract

The application provides an electric drive assembly, comprising a cooling lubricating oil circuit and a drive assembly; the drive assembly comprises a main shell and a drive motor installed in the main shell, and an inner wall of the main shell is provided with a spiral oil circuit which spirally distributes around a central axis of the main shell and extends along an axial direction of the main shell; the cooling lubricating oil circuit comprises a main oil circuit which is used for outputting oil to the drive assembly and is communicated with the spiral oil circuit. Through the arrangement, each part of the drive motor in the axial direction is covered, and the drive motor is uniformly and sufficiently cooled; and the oil spirally advances in the spiral oil circuit, the flow resistance of the oil is reduced, and the heat dissipation and cooling efficiency of the surface of the drive motor is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling lubrication, in particular to an electric drive assembly. BACKGROUND

[0002] With the promotion of electric vehicles, the electric drive assembly as the power driving part is increasingly developing towards high pressure, high power and high speed. With the increase of the power of the motor, the heat loss generated by the motor is greater, and the demand for cooling of the motor stator and rotor is higher. If the motor cannot be cooled efficiently, heat will accumulate in the rotor core, and the rotor will have the risk of demagnetization of the magnetic steel, which will cause the power of the drive assembly to decrease permanently. With the accumulation of heat, the temperature of the stator rises, and the insulation material of the stator winding will also face accelerated aging. At the same time, the resistance of the winding increases with the increase of temperature, which further leads to the decrease of the efficiency of the electric drive assembly. A poor thermal management system will affect the power output of the motor, reduce the power performance of the vehicle, and increase the energy consumption of the vehicle. Therefore, the cooling and heat dissipation effect of the motor is essential for the reliability, stability and high efficiency of the motor.

[0003] At present, the commonly used driving motor cooling structure in new energy passenger vehicles has three cooling and heat dissipation modes: water cooling, oil cooling and oil-water mixed cooling. The oil cooling method has some advantages over the water cooling method, such as reliable electrical insulation performance, direct cooling of the motor stator and rotor, and improved cooling efficiency. At the same time, due to the advantages of structural design, the oil cooling method can also effectively improve the power density of the motor and facilitate the lightweight design of the motor.

[0004] At present, the commonly used oil-cooled motor stator cooling methods include splashing oil inside the shell to take away heat or using an oil ring structure to spray the stator winding. The heat dissipation parts inside and outside the motor are in contact with the cooling medium, and the motor is cooled by circulating the cooling medium.

[0005] However, using the above method to cool the stator can only cool the two ends of the stator, and the heat inside the stator cannot be removed, so the cooling efficiency is not high. SUMMARY

[0006] In view of this, the present application provides an electric drive assembly which can improve the cooling efficiency of the driving motor.

[0007] Specifically, the technical scheme comprises the following:

[0008] The electric drive assembly provided by the present application embodiment comprises a cooling lubricating oil circuit and a driving assembly;

[0009] The driving assembly comprises a main shell and a driving motor installed in the main shell, and the inner wall of the main shell is provided with a spiral oil circuit which spirally distributes around the central axis of the main shell and extends along the axial direction of the main shell.

[0010] The cooling lubricating oil circuit comprises a main oil circuit for outputting oil to the driving assembly, and the main oil circuit is communicated with the spiral oil circuit.

[0011] In an optional embodiment, the driving motor comprises a stator, a rotor and a rotor shaft, the rotor is annularly arranged at the outer periphery of the rotor shaft, the stator is annularly arranged at the outer periphery of the rotor, the rotor shaft is provided with a hollow oil cavity extending along the axial direction of the rotor shaft, and the rotor is provided with a rotor oil circuit extending along the axial direction of the rotor, and the rotor oil circuit is communicated with the hollow oil cavity.

[0012] The cooling lubricating oil circuit further comprises a first branch circuit communicated with the main oil circuit and the hollow oil cavity respectively.

[0013] In an optional embodiment, the driving motor further comprises a rotor front cover plate and a rotor rear cover plate, the rotor front cover plate and the rotor rear cover plate are both sleeved at the outer periphery of the rotor shaft, and the rotor front cover plate and the rotor rear cover plate are respectively arranged at the axial two ends of the rotor.

[0014] The rotor front cover plate and the rotor rear cover plate are both provided with a first sub-oil circuit and a second sub-oil circuit extending along the radial direction of the rotor front cover plate and the rotor rear cover plate respectively, the first sub-oil circuit is communicated with the hollow oil cavity and the rotor oil circuit respectively, one end of the second sub-oil circuit is communicated with the rotor oil circuit, and the other end is communicated with the outside of the rotor front cover plate or the rotor rear cover plate.

[0015] One end of each of the rotor oil circuits is communicated with the first sub-oil circuit, and the other end is communicated with the second sub-oil circuit.

[0016] In an optional embodiment, the rotor oil circuit is a plurality of rotor oil circuits, and the plurality of rotor oil circuits are distributed at intervals around the central axis of the rotor.

[0017] In an optional embodiment, one end of at least one of the rotor oil circuits is communicated with the first sub-oil circuit of the rotor front cover plate, and the other end is communicated with the second sub-oil circuit of the rotor rear cover plate.

[0018] One end of at least one of the rotor oil circuits is communicated with the first sub-oil circuit of the rotor rear cover plate, and the other end is communicated with the second sub-oil circuit of the rotor front cover plate.

[0019] In an optional embodiment, the driving motor further comprises a stator front oil ring and a stator rear oil ring, the stator front oil ring and the stator rear oil ring are respectively arranged at the axial two ends of the stator, the outer wall of the stator front oil ring and the inner wall of the main shell form a stator front oil path, the outer wall of the stator rear oil ring and the inner wall of the main shell form a stator rear oil path, and the spiral oil path is in communication with the stator front oil path and the stator rear oil path respectively.

[0020] The stator is provided with a plurality of connecting oil paths, and the two ends of the connecting oil path are in communication with the stator front oil path and the stator rear oil path respectively.

[0021] The cooling and lubricating oil path further comprises a second branch, and the second branch is in communication with the main oil path and the stator front oil path respectively.

[0022] In an optional embodiment, the driving assembly further comprises a reducer shell and a reducer input shaft assembly, the reducer input shaft assembly is arranged in the reducer shell, and the reducer shell is connected with one end of the main shell.

[0023] The reducer input shaft assembly comprises a plurality of bearings and a plurality of gears, at least one of the main oil path, the first branch and the second branch is provided with a lubricating sub-oil path, and the lubricating sub-oil path is used for outputting oil to the plurality of bearings and / or the plurality of gears.

[0024] In an optional embodiment, the end face of the reducer shell is provided with a bearing seat hole for mounting the bearing, the end face of the reducer shell is further recessed with an oil guide groove, the oil guide groove is in communication with the bearing seat hole, and the oil inlet of the bearing is at least partially located in the oil guide groove.

[0025] In an optional embodiment, the opening size of the oil guide groove gradually increases from one end close to the bearing seat hole to one end away from the bearing seat hole.

[0026] In an optional embodiment, the end face of the reducer shell is provided with a reinforcing rib, the reinforcing rib is located at the edge of the oil guide groove and connected with the side wall of the oil guide groove.

[0027] The technical scheme provided by the embodiments has at least the following beneficial effects: by arranging the spiral oil path in communication with the main oil path on the inner wall of the main shell, the oil flowing out of the main oil path flows into the spiral oil path, covering each part in the axial direction of the driving motor, and the driving motor is uniformly and sufficiently cooled; and the oil spirally advances in the spiral oil path, reducing the flow resistance of the oil, and further improving the heat dissipation and cooling efficiency of the surface of the driving motor. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A structural schematic diagram of an electric drive assembly provided by an embodiment of the present application;

[0030] Figure 2 A structural schematic diagram of a cooling lubricating oil circuit provided by an embodiment of the present application;

[0031] Figure 3 A cooperation schematic diagram of a reducer input shaft assembly and a cooling lubricating oil circuit provided by an embodiment of the present application;

[0032] Figure 4 A front view of a reducer housing provided by an embodiment of the present application;

[0033] Figure 5 A cooperation schematic diagram of a main housing and a rotor provided by an embodiment of the present application;

[0034] Figure 6 A structural schematic diagram of a stator provided by an embodiment of the present application;

[0035] Figure 7 A sectional view of a driving motor provided by an embodiment of the present application.

[0036] The reference signs in the drawings respectively represent:

[0037] 1-main housing; 11-helical oil circuit; 2-driving motor; 21-stator; 211-connection oil circuit; 212-stator winding; 22-rotor; 221-rotor oil circuit; 23-rotor shaft; 231-hollow oil cavity; 232-oil throwing hole; 24-rotor front cover plate; 241-first sub-oil circuit; 242-second sub-oil circuit; 25-rotor rear cover plate; 26-stator front end oil ring; 261-stator front end oil circuit; 262-oil injection hole; 27-stator rear end oil ring; 271-stator rear end oil circuit; 3-reducer housing; 31-bearing seat hole; 32-oil guide groove; 33-stiffener; 4-reducer input shaft assembly; 41-gear; 42a-first bearing; 42b-second bearing; 42c-third bearing; 42d-fourth bearing; 42e-fifth bearing;

[0038] 5 - cooling lubricating oil circuit; 531 - main oil circuit; 52 - first branch; 53 - second branch; 531 - branch oil circuit; 54a - first lubricating sub-oil circuit; 54b - second lubricating sub-oil circuit; 54c - third lubricating sub-oil circuit; 54d - fourth lubricating sub-oil circuit; 54e - fifth lubricating sub-oil circuit; 54f - sixth lubricating sub-oil circuit; 54g - seventh lubricating sub-oil circuit; 6 - electric oil pump; 7 - oil cooler; 8 - filter mechanism.

[0039] The specific embodiments of the present application have been shown and described in the above drawings, which will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the present application in any way, but to illustrate the concept of the present application by reference to specific embodiments. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0041] The positional nouns such as "upper", "lower", "side" and the like involved in the embodiments of the present application are generally based on the relative relationship of the positions shown in the drawings, and these positional nouns are only used to more clearly describe the structures and the relationship between the structures, and are not intended to describe absolute positions. When the product is placed in different attitudes, the positions may change, for example, "upper" and "lower" may be interchanged. Figure 1

[0042] Unless otherwise defined, all the technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art. Some technical terms appearing in the embodiments of the present application will be explained below.

[0043] In order to make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the drawings.

[0044] As shown in FIG. Figures 1 to 7 The embodiments of the present application provide an electric drive assembly, which comprises a cooling lubricating oil circuit 5 and a drive assembly.

[0045] The drive assembly comprises a main housing 1 and a drive motor 2 installed in the main housing 1, and the inner wall of the main housing 1 is provided with a spiral oil circuit 11, which is spirally distributed around the central axis of the main housing 1 and extends along the axial direction of the main housing 1; the cooling lubricating oil circuit 5 comprises a main oil circuit 531, which is used to output oil to the drive assembly, and the main oil circuit 531 is in communication with the spiral oil circuit 11.​

[0046] The main oil path 531 can be formed by a pipe, or can be in the form of a hole, a groove, etc. provided on the main housing 1 or a component, as long as a certain oil flow path can be formed. The oil in the main oil path 531 can forcibly cool and lubricate the components in the main housing 1, and the oil directly exchanges heat with the components, thereby having a better cooling and lubricating effect.

[0047] As shown in the example, Figure 5 The main housing 1 has a cylindrical inner cavity, the drive motor 2 is accommodated in the inner cavity, the center axis of the inner cavity is collinear with the center axis of the drive motor 2, and the spiral oil path 11 is spirally arranged on the inner wall of the main housing 1.

[0048] By arranging the spiral oil path 11 on the inner wall of the main housing 1, the flow path length of the oil in the main housing 1 is increased, and each part in the axial direction of the drive motor 2 is covered, so that the oil can sufficiently cool the drive motor 2, and the cooling efficiency and effect of the drive motor 2 are improved.

[0049] As shown in the example, Figure 2 The electric drive assembly further includes an electric oil pump 6, an oil cooler 7, and a filter mechanism 8. The electric oil pump 6 is used to pump oil to the upstream end of the main oil path 531, the electric oil pump 6, the filter mechanism 8, and the oil cooler 7 are sequentially connected, and the oil cooler 7 is in communication with the main oil path 531.

[0050] As an example, the electric oil pump 6 draws oil at the bottom of the main housing 1 and pumps the oil to the filter mechanism 8 for fine filtration, the filtered oil flows into the oil cooler 7 for heat exchange and cooling, and the cooled oil flows into the main oil path 531. By arranging the electric oil pump 6, the oil cooler 7, and the filter mechanism 8, oil with low temperature, cleanliness, and meeting the pressure and flow requirements is provided for the main oil path 531, and the cooling and lubricating effect is improved.

[0051] The electric drive assembly provided by the embodiment of the present application has the spiral oil path 11 arranged on the inner wall of the main housing 1 and in communication with the main oil path 531, so that the oil flowing out of the main oil path 531 flows into the spiral oil path 11 and covers each part in the axial direction of the drive motor 2, thereby uniformly and sufficiently cooling the drive motor 2. Moreover, the oil spirally advances in the spiral oil path 11, thereby reducing the flow resistance of the oil and further improving the heat dissipation and cooling efficiency of the surface of the drive motor 2.

[0052] In a further embodiment, the driving motor 2 comprises a stator 21, a rotor 22 and a rotor shaft 23, the rotor 22 is annularly arranged at the outer periphery of the rotor shaft 23, the stator 21 is annularly arranged at the outer periphery of the rotor 22, the rotor shaft 23 is provided with a hollow oil cavity 231 extending along the axial direction of the rotor shaft 23, the rotor 22 is provided with a rotor oil passage 221 extending along the axial direction of the rotor 22, and the rotor oil passage 221 is in communication with the hollow oil cavity 231. The cooling and lubricating oil passage 5 further comprises a first branch 52, which is in communication with the main oil passage 531 and the hollow oil cavity 231, respectively.

[0053] Specifically, the stator 21, the rotor 22 and the rotor shaft 23 are coaxially arranged, the rotor 22 is sleeved on the rotor shaft 23 and is connected with the rotor shaft 23 in interference fit to realize synchronous movement. The stator 21 is arranged around the outer periphery of the rotor 22 and has a gap between the stator 21 and the rotor 22, the stator 21 is connected with the main housing 1 in interference fit, and the stator winding 212 extends from the two ends of the stator 21 in the axial direction.

[0054] By arranging the hollow oil cavity 231 in the rotor shaft 23, the space occupied by the additional oil pipeline is saved, which is beneficial to improve the space utilization of the internal space of the electric driving assembly and make the structure of the electric driving assembly more compact.

[0055] As shown in Figure 7 , the rotor oil passage 221 extends through the rotor 22 along the axial direction of the rotor, and the oil in the hollow oil cavity 231 enters the rotor oil passage 221 to exchange heat with the rotor, thereby improving the cooling effect and efficiency of the rotor 22.

[0056] Specifically, one end of the first branch 52 is in communication with the main oil passage 531, and the other end is in communication with the hollow oil cavity 231, and the oil in the main oil passage 531 flows through the first branch 52 and the hollow oil cavity 231 in turn and then enters the rotor oil passage 221.

[0057] For example, a sub-oil passage is arranged in the rotor 22 to communicate the hollow oil cavity 231 and the rotor oil passage 221; or a sub-oil passage is arranged in other components in the driving assembly to communicate the hollow oil cavity 231 and the rotor oil passage 221.

[0058] In a further embodiment, as shown in Figure 5 or Figure 7 , the driving motor 2 further comprises a rotor front cover plate 24 and a rotor rear cover plate 25, the rotor front cover plate 24 and the rotor rear cover plate 25 are both sleeved on the outer periphery of the rotor shaft 23, and the rotor front cover plate 24 and the rotor rear cover plate 25 are arranged at the two axial ends of the rotor 22, respectively. Figure 7As shown, the rotor front cover plate 24 and the rotor rear cover plate 25 are both provided with a first sub-oil passage 241 and a second sub-oil passage 242 extending along the radial direction of the rotor front cover plate 24 and the rotor rear cover plate 25, respectively. The first sub-oil passage 241 is in communication with the hollow oil cavity 231 and the rotor oil passage 221, respectively. The second sub-oil passage 242 is in communication with the rotor oil passage 221 at one end and with the outside of the rotor front cover plate 24 or the rotor rear cover plate 25 at the other end. Each rotor oil passage 221 is in communication with the first sub-oil passage 241 at one end and with the second sub-oil passage 242 at the other end.

[0059] Exemplarily, the rotor front cover plate 24 is installed at one end of the rotor 22 close to the main oil passage 531, and the rotor rear cover plate 25 is installed at the other end of the rotor 22 away from the main oil passage 531.

[0060] The first sub-oil passage 241 and the second sub-oil passage 242 are both blind holes provided on the rotor front cover plate 24 or the rotor rear cover plate 25, i.e., the first sub-oil passage 241 and the second sub-oil passage 242 do not extend through the rotor front cover plate 24 or the rotor rear cover plate 25 along the radial direction of the rotor front cover plate 24 and the rotor rear cover plate 25.

[0061] Specifically, the rotor front cover plate 24 and the rotor rear cover plate 25 are provided with a through hole at the center position, and the rotor front cover plate 24 and the rotor rear cover plate 25 are sleeved on the outer periphery of the rotor shaft 23 through the through hole. One end of the first sub-oil passage 241 is in communication with the through hole, and the other end is in communication with the rotor oil passage 221. One end of the second sub-oil passage 242 is in communication with the rotor oil passage 221, and the other end is open to the outside of the rotor front cover plate 24 or the rotor rear cover plate 25.

[0062] As shown, Figure 7 The rotor shaft 23 is provided with a plurality of oil throwing holes 232. The extension direction of the oil throwing hole 232 is perpendicular to the axial direction of the rotor shaft 23 or is obliquely arranged with respect to the axial direction of the rotor shaft 23. The oil throwing hole 232 is in communication with the hollow oil cavity 231 and the first sub-oil passage 241, respectively, so as to transport the oil in the hollow oil cavity 231 to the first sub-oil passage 241.

[0063] One end of each rotor oil passage 221 is communicated with at least one first sub-oil passage 241, and the other end is communicated with at least one second sub-oil passage 242. Exemplarily, one end of each rotor oil passage 221 is communicated with one first sub-oil passage 241, and the other end is communicated with one second sub-oil passage 242. It can be understood that one end of the rotor oil passage 221 is communicated with the first sub-oil passage 241 of one of the rotor front cover plate 24 and the rotor rear cover plate 25, and the other end of the rotor oil passage 221 is communicated with the second sub-oil passage 242 of the other one of the rotor front cover plate 24 and the rotor rear cover plate 25. Through this arrangement, the oil flowing into the rotor front cover plate 24 flows to the rotor rear cover plate 25 through the rotor oil passage 221 and is thrown out from the second sub-oil passage 242 of the rotor rear cover plate 25, not only heat-exchanged with the rotor 22, but also cooled the inner ring of the stator winding 212 at the rear end; and / or the oil flowing into the rotor rear cover plate 25 flows to the rotor front cover plate 24 through the rotor oil passage 221 and is thrown out from the second sub-oil passage 242 of the rotor front cover plate 24, not only heat-exchanged with the rotor 22, but also cooled the inner ring of the stator winding 212 at the front end.

[0064] In a further embodiment, the rotor oil passage 221 is a plurality of rotor oil passages 221, and the plurality of rotor oil passages 221 are spaced around the central axis of the rotor 22.

[0065] By arranging the plurality of rotor oil passages 221 spaced around the central axis of the rotor 22, the uniform and sufficient cooling of each part in the circumferential direction of the rotor 22 is facilitated, thereby further improving the cooling effect and efficiency of the rotor 22.

[0066] Optionally, the plurality of rotor oil passages 221 are uniformly spaced around the central axis of the rotor 22, and the spacing between any two adjacent rotor oil passages 221 is equal, further achieving uniform heat dissipation at each position in the circumferential direction of the rotor 22.

[0067] Further, one end of at least one rotor oil passage 221 is communicated with the first sub-oil passage 241 of the rotor front cover plate 24, and the other end is communicated with the second sub-oil passage 242 of the rotor rear cover plate 25; one end of at least one rotor oil passage 221 is communicated with the first sub-oil passage 241 of the rotor rear cover plate 25, and the other end is communicated with the second sub-oil passage 242 of the rotor front cover plate 24.

[0068] Through this arrangement, the rotor front cover plate 24 and the rotor rear cover plate 25 can both throw out oil through the second sub-oil passage 242, cool the inner ring of the stator winding 212 at the front and rear ends, and improve the cooling effect of the stator 21.

[0069] As Figure 7As shown, the driving motor 2 further comprises a stator front end oil ring 26 and a stator rear end oil ring 27, which are respectively arranged at the axial two ends of the stator 21, the outer wall of the stator front end oil ring 26 and the inner wall of the main shell 1 surround to form a stator front end oil path 261, the outer wall of the stator rear end oil ring 27 and the inner wall of the main shell 1 surround to form a stator rear end oil path 271, and the spiral oil path 11 is in communication with the stator front end oil path 261 and the stator rear end oil path 271 respectively; the stator 21 is provided with a plurality of connecting oil paths 211, the two ends of each connecting oil path 211 are in communication with the stator front end oil path 261 and the stator rear end oil path 271 respectively; and the cooling and lubricating oil path 5 further comprises a second branch 53, which is in communication with the main oil path 531 and the stator front end oil path 261 respectively.

[0070] Specifically, one end of the second branch 53 is in communication with the main oil path 531, and the other end is in communication with the stator front end oil path 261, and the oil in the main oil path 531 flows through the second branch 53, the stator front end oil path 261, the spiral oil path 11 and the stator rear end oil path 271 in sequence to cool and cool the surface of the stator 21.

[0071] As shown in the figure, Figure 2 The connecting oil path 211 is a plurality of connecting oil paths 211, which are arranged at intervals around the central axis of the stator 21, and each connecting oil path 211 extends along the axial direction of the stator 21.

[0072] Optionally, as shown in the figure, Figure 6 The stator front end oil ring 26 and the stator rear end oil ring 27 are both provided with oil injection holes 262 extending in the radial direction, the oil injection holes 262 on the stator front end oil ring 26 are in communication with the stator front end oil path 261, and the oil injection holes 262 on the stator rear end oil ring 27 are in communication with the stator rear end oil path 271, and the oil injection holes 262 are used to spray oil onto the stator winding 212 to cool and cool the outer ring of the stator winding 212.

[0073] Further, the driving assembly further comprises a reducer shell 3 and a reducer input shaft assembly 4, the reducer input shaft assembly 4 is arranged in the reducer shell 3, and the reducer shell 3 is connected with one end of the main shell 1; the reducer input shaft assembly 4 comprises a plurality of bearings and a plurality of gears 41, and at least one of the main oil path 531, the first branch 52 and the second branch 53 is provided with a lubricating sub-oil path, which is used to output oil to the plurality of bearings and / or the plurality of gears 41.

[0074] Exemplarily, as shown in the figure, Figure 3 The reducer input shaft assembly 4 comprises a first bearing 42a, a second bearing 42b and a third bearing 42c, a fourth bearing 42d and a fifth bearing 42e, wherein the third bearing 42c, the fourth bearing 42d and the fifth bearing 42e are coaxially arranged. As shown in the figure, Figure 2As shown, the main oil passage 531 is provided with a plurality of lubricating sub-oil passages, which are a first lubricating sub-oil passage 54a, a second lubricating sub-oil passage 54b, a third lubricating sub-oil passage 54c, and a fourth lubricating sub-oil passage 54d. The first lubricating sub-oil passage 54a corresponds to the position of the first bearing 42a and is used to output oil to the first bearing 42a; the second lubricating sub-oil passage 54b and the third lubricating sub-oil passage 54c correspond to the position of the second bearing 42b and are used to output oil to the second bearing 42b; and the fourth lubricating sub-oil passage 54d corresponds to the position of the third bearing 42c and is used to output oil to the third bearing 42c.

[0075] As shown in FIG. 4, the second branch 53 has two branch oil passages 531, one of which has two fifth lubricating sub-oil passages 54e, and the other of which has a sixth lubricating sub-oil passage 54f and a seventh lubricating sub-oil passage 54g. The two fifth lubricating sub-oil passages 54e correspond to the positions of the two meshing gears 41 of the reducer input shaft assembly 4 and are used to output oil to the gears 41; the sixth lubricating sub-oil passage 54f corresponds to the position of the fourth bearing 42d and is used to output oil to the fourth bearing 42d; and the seventh lubricating sub-oil passage 54g corresponds to the position of the fifth bearing 42e and is used to output oil to the fifth bearing 42e. Figure 2 In this embodiment, by providing lubricating sub-oil passages, forced cooling and lubrication can be performed on multiple bearings and / or multiple gears 41, and oil can be directly supplied to the bearings and gears 41 without thermal resistance, thereby achieving better cooling and lubrication effects; at the same time, the normal operation of the bearings and gears 41 is ensured, and dry friction of the gears 41 due to lack of lubrication is prevented, thereby preventing inter-tooth wear.

[0076] In a further embodiment, the end face of the reducer housing 3 is provided with bearing seat holes 31 for mounting bearings, and the end face of the reducer housing 3 is recessed with oil guide grooves 32, which communicate with the bearing seat holes 31, and the oil inlet of the bearing is at least partially located in the oil guide grooves 32.

[0077] As shown in FIG. 4, the bearing seat holes 31 are three, and the three bearing seat holes 31 are respectively used to mount the first bearing 42a, the second bearing 42b, and the third bearing 42c; and the oil guide grooves 32 are three, and the three oil guide grooves 32 are connected to the three bearing seat holes 31 one by one.

[0078] Figure 4 As shown in FIG. 4, the bearing seat holes 31 are three, and the three bearing seat holes 31 are respectively used to mount the first bearing 42a, the second bearing 42b, and the third bearing 42c; and the oil guide grooves 32 are three, and the three oil guide grooves 32 are connected to the three bearing seat holes 31 one by one.

[0079] ​In this embodiment, by setting an oil guide groove 32, the oil stirred up by the gear 41 and the suspended oil in the reducer housing 3 are collected by the oil guide groove 32, and the oil is introduced into the oil inlet of the bearing for cooling and lubrication, which improves the utilization rate of the oil and enhances the cooling and lubrication effect on the bearing.

[0080] Furthermore, the opening size of the oil guide groove 32 gradually increases from the end near the bearing housing hole 31 to the end away from the bearing housing hole 31.

[0081] like Figure 4 As shown, the two oil guide grooves 32 are V-shaped, with a larger opening at the top and a smaller opening at the bottom.

[0082] This design facilitates the guidance of oil, allowing it to flow from the large end to the small end along the wall of the oil guide groove 32. This enables more oil to flow into the bearing's oil inlet, enhancing the cooling and lubrication effect on the bearing.

[0083] In one specific embodiment, a reinforcing rib 33 is provided on the end face of the reducer housing 3. The reinforcing rib 33 is located at the edge of the oil guide groove 32 and is connected to the side wall of the oil guide groove 32.

[0084] like Figure 4 As shown, in the two "V"-shaped oil guide grooves 32, two reinforcing ribs 33 are provided on both sides of the oil guide groove 32, and the outer wall of the reinforcing rib 33 near the oil guide groove 32 is connected to the side wall of the oil guide groove 32.

[0085] By setting the reinforcing rib 33, not only is it beneficial to enhance the structural strength of the end face of the reducer housing 3, but it also improves the guiding effect of the oil guide groove 32 on the oil, allowing more oil to flow into the oil inlet of the bearing and enhancing the cooling and lubrication effect on the bearing.

[0086] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0087] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0088] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An electric drive assembly, characterized by The electric drive assembly comprises a cooling lubricating oil circuit (5) and a drive assembly; The drive assembly comprises a main housing (1) and a drive motor (2) installed in the main housing (1), and an inner wall of the main housing (1) is provided with a spiral oil circuit (11) which is spirally distributed around a central axis of the main housing (1) and extends along an axial direction of the main housing (1); The cooling lubricating oil circuit (5) comprises a main oil circuit (531) for outputting oil to the drive assembly, and the main oil circuit (531) is in communication with the spiral oil circuit (11); the drive motor (2) comprises a stator (21), a rotor (22) and a rotor shaft (23), the rotor (22) is annularly arranged at an outer periphery of the rotor shaft (23), the stator (21) is annularly arranged at an outer periphery of the rotor (22), the rotor shaft (23) is provided with a hollow oil cavity (231) extending along an axial direction of the rotor shaft (23), and the rotor (22) is provided with a rotor oil circuit (221) extending along an axial direction of the rotor (22), and the rotor oil circuit (221) is in communication with the hollow oil cavity (231); The cooling lubricating oil circuit (5) further comprises a first branch (52) in communication with the main oil circuit (531) and the hollow oil cavity (231) respectively; The drive motor (2) further comprises a stator front-end oil ring (26) and a stator rear-end oil ring (27), the stator front-end oil ring (26) and the stator rear-end oil ring (27) are arranged at two axial ends of the stator (21) respectively, an outer wall of the stator front-end oil ring (26) and an inner wall of the main housing (1) surround to form a stator front-end oil circuit (261), an outer wall of the stator rear-end oil ring (27) and the inner wall of the main housing (1) surround to form a stator rear-end oil circuit (271), and the spiral oil circuit (11) is in communication with the stator front-end oil circuit (261) and the stator rear-end oil circuit (271) respectively; The stator (21) is provided with a plurality of connecting oil circuits (211), and two ends of each connecting oil circuit (211) are in communication with the stator front-end oil circuit (261) and the stator rear-end oil circuit (271) respectively; The cooling lubricating oil circuit (5) further comprises a second branch (53) in communication with the main oil circuit (531) and the stator front-end oil circuit (261) respectively; The drive assembly further comprises a reducer housing (3) and a reducer input shaft assembly (4), the reducer input shaft assembly (4) is arranged in the reducer housing (3), and the reducer housing (3) is connected with one end of the main housing (1); The reducer input shaft assembly (4) comprises a plurality of bearings and a plurality of gears (41), and at least one of the main oil circuit (531), the first branch (52) and the second branch (53) is provided with a lubricating sub-oil circuit for outputting oil to the plurality of bearings and / or the plurality of gears (41).

2. The electric drive assembly of claim 1, wherein, The driving motor (2) further comprises a rotor front cover plate (24) and a rotor rear cover plate (25), both of which are sleeved on the outer periphery of the rotor shaft (23), and both of which are arranged at the axial ends of the rotor (22); Both the rotor front cover plate (24) and the rotor rear cover plate (25) are provided with a first sub-oil passage (241) and a second sub-oil passage (242) extending along the radial direction thereof, the first sub-oil passage (241) is in communication with the hollow oil cavity (231) and the rotor oil passage (221) respectively, one end of the second sub-oil passage (242) is in communication with the rotor oil passage (221), and the other end is in communication with the outside of the rotor front cover plate (24) or the rotor rear cover plate (25); One end of each rotor oil passage (221) is in communication with the first sub-oil passage (241), and the other end is in communication with the second sub-oil passage (242).

3. The electric drive assembly of claim 2, wherein, The rotor oil passage (221) is a plurality of, and the plurality of rotor oil passages (221) are distributed at intervals around the central axis of the rotor (22).

4. The electric drive assembly of claim 3, wherein, One end of at least one rotor oil passage (221) is in communication with the first sub-oil passage (241) of the rotor front cover plate (24), and the other end is in communication with the second sub-oil passage (242) of the rotor rear cover plate (25). One end of at least one rotor oil passage (221) is in communication with the first sub-oil passage (241) of the rotor rear cover plate (25), and the other end is in communication with the second sub-oil passage (242) of the rotor front cover plate (24).

5. The electric drive assembly of claim 1, wherein, The end surface of the reducer housing (3) is provided with a bearing seat hole (31) for mounting the bearing, and the end surface of the reducer housing (3) is further recessed with an oil guide groove (32), the oil guide groove (32) is in communication with the bearing seat hole (31), and the oil inlet of the bearing is at least partially located in the oil guide groove (32).

6. The electric drive assembly of claim 5, wherein, The opening size of the oil guide groove (32) gradually increases from one end close to the bearing seat hole (31) to one end away from the bearing seat hole (31).

7. The electric drive assembly of claim 5, wherein, The end surface of the reducer housing (3) is provided with a reinforcing rib (33), which is located at the edge of the oil guide groove (32) and connected with the side wall of the oil guide groove (32).

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