Coaxial oil-cooled motor structure of integrated speed reducer

Abstract

The utility model relates to a coaxial oil-cooled motor structure of an integrated speed reducer, which comprises a motor and a speed reducer arranged at the side part of the front end of the motor, a driving gear is arranged at one end, close to the speed reducer, of a motor shaft in a pressing manner, and the driving gear is meshed with a speed reducing intermediate shaft; a stator lubricating oil way and a rotor lubricating oil way which are communicated with the motor cavity are formed in the motor, an oil outlet window is formed in the side wall, connected with the speed reducer, of a motor shell, and the oil outlet window is communicated with the motor cavity and the speed reducer cavity. A shell oil channel is axially constructed on the side wall of the motor shell, and the shell oil channel is communicated with the stator lubricating oil way and the speed reducer cavity. According to the scheme, the stator lubricating oil circuit / rotor lubricating oil circuit, the motor cavity, the oil outlet window, the speed reducer cavity, the shell oil duct and the stator lubricating oil circuit form a circulating common oil cooling system, speed reducer lubricating oil can cool the stator system through the shell oil duct, the interior of the motor is fully lubricated, the overall heat dissipation capacity of the motor is improved, and therefore the efficiency of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a coaxial oil-cooled motor structure with an integrated reducer. Background Art

[0002] The existing reducers, motors and controllers are independent of each other, with low integration, and generally the reducers are oil-cooled, while the motors and controllers are water-cooled or air-cooled. The cooling of air-cooled motors can only rely on the heat exchange between the shell and the air, and the heat dissipation capacity is poor. The stator can also be cooled by heat transfer through the shell, but the rotor has no cooling method; the water channel design of the water-cooled motor requires a double shell, and an external water pipe is required when sharing the water channel with the controller, and the EDS assembly space requirements are large.

[0003] When the reducer and motor are not designed to be coaxial, there are a total of 4 bearings for the reducer and motor on the input axis, which is more expensive.

[0004] The existing motors that are cooled by oil have hollow shafts. The lubricating oil is introduced through the spline end or the rotary end. The centrifugal force when the motor rotates is used to form a lubrication cycle through the oil outlet holes on the shaft body. The problem with this structure is that the hollow shaft structure with an internal oil guide pipe requires many processes such as rotary forging, laser welding of the shaft body, and deep drilling, which is complex and costly.

[0005] There is another structure in which the motor shaft is a solid shaft (or coaxial), the reducer and the motor share a common shell, and the reducer lubricating oil flows directly into the motor cavity for oil cooling. The problem with this structure is that the rotor cannot be cooled well due to centrifugal force without using a hollow shaft. Summary of the invention

[0006] In order to solve the above problems, the purpose of the utility model is to provide a coaxial oil-cooled motor structure with an integrated reducer.

[0007] The reducer and the motor share a housing (end face), and the structure of the intermediate shaft connecting the differential removes the reducer input shaft, saving bearings and reducer input shaft oil seals, reducing costs, and reducing the installation space of the three-in-one in the axle direction. In addition, the motor and the reducer use the same lubricating oil and are oil-cooled together. The combined structure can guide the reducer lubricating oil to cool the stator system. The two sets of lubricating oil circuits of the stator and the rotor are connected in parallel, and the motor is fully lubricated, which improves the overall heat dissipation capacity of the motor, thereby improving the motor efficiency.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0009] A coaxial oil-cooled motor structure with integrated reducer comprises a motor, the motor comprises a motor housing, a stator and a rotor, a motor cavity is formed in the motor housing, the rotor comprises a motor shaft, both sides of the motor shaft are respectively mounted on the motor housing through two first bearings, and the structure is characterized in that: it also comprises a reducer mounted on the front end side of the motor, the reducer comprises a reducer housing and a reduction intermediate shaft arranged in the reducer housing, a reducer cavity is formed in the reducer housing, the reducer housing is connected to the motor housing, a driving gear is press-fitted on one end of the motor shaft close to the reducer, and the driving gear is meshed with the reduction intermediate shaft;

[0010] A stator lubricating oil circuit and a rotor lubricating oil circuit which are connected to the motor cavity are formed inside the motor; an oil outlet window is provided on the side wall of the motor casing connected to the reducer, and the oil outlet window is connected to the motor cavity and the reducer cavity; a shell oil channel is axially constructed on the side wall of the motor casing, and the shell oil channel connects the stator lubricating oil circuit and the reducer cavity.

[0011] In the above technical scheme, the reducer is connected and installed on the side of the front end of the motor, the reducer housing is connected to the motor casing, and the connected part is provided with an oil outlet window and a housing oil channel, the housing oil channel is connected to the stator lubricating oil circuit, the stator lubricating oil circuit and the rotor lubricating oil circuit in the motor are arranged in parallel and are both connected to the motor cavity, and then the stator lubricating oil circuit / rotor lubricating oil circuit, the motor cavity, the oil outlet window, the reducer cavity, the housing oil channel and the stator lubricating oil circuit form a circulating common oil cooling system, and the reducer lubricating oil can cool the stator system through the housing oil channel, so that the internal lubrication of the motor is sufficient, improving the overall heat dissipation capacity of the motor, thereby improving the motor efficiency.

[0012] The front end of the motor shaft is press-fitted with a driving gear that meshes with the intermediate shaft of the reducer, and the power is transmitted to the reducer through a primary gear pair, which reduces the mechanical loss of the spline connection between the reducer and the motor, and directly transmits power through the two-pole gears. The input and output are coaxial and have high coaxiality.

[0013] Preferably, the stator includes a stator core, and the stator lubricating oil circuit includes an annular oil inlet groove formed circumferentially on the side wall of the stator core, and the side walls on both sides of the annular oil inlet groove are circumferentially constructed with multiple oil outlet holes, and the oil outlet holes extend axially to the end face of the stator core to form an oil injection channel that communicates with the motor cavity; a short oil channel is provided on the motor housing to connect the housing oil channel with the annular oil inlet groove. In this technical solution, the lubricating oil in the reducer can flow to the stator through the upper housing oil channel, and then flow to the two ends of the stator through the oil channel on the stator core, so as to cool the stator and improve heat dissipation; the front end of the motor shaft and the housing of the motor housing are sealed without oil seals, which reduces costs, and part of the lubricating oil can splash through the gear work, and then flow into the motor cavity along the shaft through the first bearing and the rotary transformer at the front end, and the falling lubricating oil flows to the reducer through the oil outlet window at the bottom of the housing of the motor housing to form a cycle, so as to avoid the accumulation of lubricating oil at the bottom of the motor housing and improve the utilization rate of lubricating oil.

[0014] Preferably, the motor shaft is a through-hole hollow shaft. In this technical solution, the motor shaft is a through-hole hollow shaft, which can be processed by various processes such as rotary forging or tube processing, with a small impact on the shaft diameter ratio, a large coverage range, and a wide matching (rotor core) surface.

[0015] Preferably, an intermediate shaft is passed through the motor shaft, and the motor housing includes a housing and an end cover axially fixed to the housing. The intermediate shaft is mounted on the end cover through a second bearing, and the two ends of the intermediate shaft extend out of the motor shaft and are assembled with the differential and the half shaft. In this technical solution, the intermediate shaft is assembled on the end cover, passes through the motor shaft to connect the reducer, and serves as the power output end. The front end (close to the reducer side) is connected to the differential through a spline, and the rear end is directly connected to the half shaft. This structure removes the reducer input shaft, saves bearings and reducer input shaft oil seals, and reduces costs.

[0016] Preferably, the end cover is provided with an oil inlet communicated with the oil pump, the rotor lubricating oil circuit includes an oil inlet passage communicated with the oil inlet and arranged on the end cover, an oil inlet gap is formed between the motor shaft and the intermediate shaft, and the oil inlet passage, the second bearing and the oil inlet gap are communicated. In this technical solution, the lubricating oil filtered in the oil pump enters the oil inlet passage of the end cover through the oil inlet, passes through the second bearing of the intermediate shaft, flows into the oil inlet gap inside the motor shaft along the shaft body of the intermediate shaft, fully lubricates the rotor part, and improves the heat dissipation capacity of the rotor.

[0017] Preferably, a plurality of first oil guide holes are opened circumferentially on the side wall of the motor shaft, and the first oil guide holes extend vertically inward to form a first oil guide channel communicating with the oil inlet gap, and the first oil guide holes have two circles corresponding to the stator coils on both sides respectively. In this technical solution, when the motor is working, as the motor shaft rotates, the lubricating oil entering the hollow shaft is thrown out from the first oil guide hole along the first oil guide channel on the inner wall of the motor shaft through centrifugal force to lubricate the stator coil package, thereby improving the heat dissipation capacity of the stator.

[0018] Preferably, a plurality of second oil guide holes are opened circumferentially on the side wall of the motor shaft, and the second oil guide holes extend obliquely inward to form a second oil guide channel communicating with the oil inlet gap, and the second oil guide holes have two circles and correspond to the inner ends of the first bearings on both sides respectively. In this technical solution, when the motor is working, as the motor shaft rotates, the lubricating oil entering the hollow shaft is thrown out from the second oil guide holes along the second oil guide channel on the inner wall of the motor shaft by centrifugal force to lubricate the first bearings on the front and rear sides, thereby improving the heat dissipation capacity of the first bearings on the front and rear sides.

[0019] Preferably, one of the first bearings is connected to the end cover, and a one-way seal is set at one end of the first bearing facing the second bearing. In this technical solution, the outer side of the first bearing at the rear side of the motor shaft is sealed by a seal to prevent the lubricating oil from flowing into the motor cavity through the first bearing, forming a range pressure difference to guide the lubricating oil in the motor cavity into the inside of the motor shaft.

[0020] Preferably, the end cover is also provided with an oil return channel, which connects the motor cavity and the oil inlet channel. In this technical solution, part of the lubricating oil splashed from the stator softening oil circuit can enter the rotor lubricating oil circuit through the oil return channel on the end cover, and the falling lubricating oil flows to the reducer and the oil pump through the oil outlet window at the bottom of the housing. It should be noted here that the oil pump is connected to the oil outlet window.

[0021] Preferably, the motor housing further comprises a connecting end plate formed on the housing axially relative to the end cover, the connecting end plate extending and connected to the reducer housing and constructed as a front end plate of the reducer. In this technical solution, the reducer and the motor share a connecting end plate, which serves as the front end plate of the reducer and the common housing, thereby reducing the installation space of the integrated structure in the axle direction and improving space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial three-dimensional structural schematic diagram of a coaxial oil-cooled motor structure with an integrated reducer.

[0023] Figure 2 This is a flow chart of the stator lubrication oil circuit.

[0024] Figure 3 This is a flow chart of the rotor lubrication oil circuit.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the shell of the motor housing.

[0026] Figure 5 It is a schematic diagram of the layout of the connecting end plate and the casing oil channel.

[0027] Figure 6 Schematic diagram of the layout of the oil channels on the stator core.

[0028] Figure 7 This is a schematic diagram of the assembly of the intermediate shaft and the motor shaft.

[0029] Figure 8 The present invention is a simplified diagram showing the flow of the oil circuit of a coaxial oil-cooled motor structure with an integrated reducer. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying 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 one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] like Figures 1 to 8 A coaxial oil-cooled motor structure with an integrated reducer is shown, comprising a motor, the motor comprising a motor housing 1, a stator and a rotor, a motor cavity 2 is formed in the motor housing 1, the rotor comprises a motor shaft 3, both sides of the motor shaft 3 are respectively mounted on the motor housing 1 through two first bearings 4, the structure also comprises a reducer mounted on the front end side of the motor, the reducer comprises a reducer housing and a reduction intermediate shaft arranged in the reducer housing, a reducer cavity is formed in the reducer housing, the reducer housing is connected to the motor housing 1, a driving gear 5 is press-fitted on one end of the motor shaft 3 close to the reducer, and the driving gear 5 is meshed with the reduction intermediate shaft;

[0036] A stator lubricating oil circuit and a rotor lubricating oil circuit which are connected to the motor cavity 2 are formed inside the motor; an oil outlet window 6 is provided on the side wall of the motor casing 1 which is connected to the reducer, and the oil outlet window 6 is connected to the motor cavity 2 and the reducer cavity; a shell oil passage 7 is axially constructed on the side wall of the motor casing 1, and the shell oil passage 7 connects the stator lubricating oil circuit and the reducer cavity.

[0037] In the above technical scheme, the reducer is connected and installed on the side of the front end of the motor, the reducer housing is connected to the motor casing, and the connected part is provided with an oil outlet window and a housing oil channel, the housing oil channel is connected to the stator lubricating oil circuit, the stator lubricating oil circuit and the rotor lubricating oil circuit in the motor are arranged in parallel and are both connected to the motor cavity, and then the stator lubricating oil circuit / rotor lubricating oil circuit, the motor cavity, the oil outlet window, the reducer cavity, the housing oil channel and the stator lubricating oil circuit form a circulating common oil cooling system, and the reducer lubricating oil can cool the stator system through the housing oil channel, so that the internal lubrication of the motor is sufficient, improving the overall heat dissipation capacity of the motor, thereby improving the motor efficiency.

[0038] The front end of the motor shaft is press-fitted with a driving gear that meshes with the intermediate shaft of the reducer, and the power is transmitted to the reducer through a primary gear pair, which reduces the mechanical loss of the spline connection between the reducer and the motor, and directly transmits power through the two-pole gears. The input and output are coaxial and have high coaxiality.

[0039] Furthermore, the stator includes a stator core, and the stator lubricating oil path includes an annular oil inlet groove 8 formed circumferentially on the side wall of the stator core, and the side walls on both sides of the annular oil inlet groove 8 are circumferentially constructed with multiple oil outlet holes 9, and the oil outlet holes 9 extend axially to the end surface of the stator core to form an oil injection channel that communicates with the motor cavity 2; the motor housing 1 is provided with a short oil passage 10 to connect the housing oil passage 7 with the annular oil inlet groove 8. In this technical solution, the lubricating oil in the reducer can flow to the stator through the upper housing oil passage, and then flow to the two ends of the stator through the oil passage on the stator core, so as to cool the stator and improve the heat dissipation; the front end of the motor shaft and the housing of the motor housing are sealed without oil seals, which reduces the cost, and part of the lubricating oil can splash through the gear work, and then flow into the motor cavity along the shaft through the first bearing and the rotary transformer at the front end, and the falling lubricating oil flows to the reducer through the oil outlet window at the bottom of the housing of the motor housing to form a cycle, so as to avoid the accumulation of lubricating oil at the bottom of the motor housing and improve the utilization rate of lubricating oil.

[0040] Furthermore, the motor shaft 3 is a through-hole hollow shaft. In this technical solution, the motor shaft is a through-hole hollow shaft, which can be processed by various processes such as rotary forging or tube processing, with a small impact on the shaft diameter ratio, a large coverage range, and a wide matching (rotor core) surface.

[0041] Furthermore, an intermediate shaft 11 is passed through the motor shaft 3, and the motor housing 1 includes a housing and an end cover 12 axially fixed to the housing. The intermediate shaft 11 is mounted on the end cover 12 through a second bearing 13, and both ends of the intermediate shaft 11 extend out of the motor shaft 3 and are assembled with the differential and the half shaft. In this technical solution, the intermediate shaft is assembled on the end cover, passes through the motor shaft to connect the reducer, and serves as the power output end. The front end (close to the reducer side) is connected to the differential through a spline, and the rear end is directly connected to the half shaft. This structure removes the reducer input shaft, saves bearings and reducer input shaft oil seals, and reduces costs.

[0042] Furthermore, the end cover 12 is provided with an oil inlet 14 communicating with the oil pump, the rotor lubricating oil circuit includes an oil inlet passage 15 communicating with the oil inlet 14 and arranged on the end cover 12, an oil inlet gap 16 is formed between the motor shaft 3 and the intermediate shaft 11, and the oil inlet passage 15, the second bearing 13 and the oil inlet gap 16 are in communication. In this technical solution, the lubricating oil filtered in the oil pump enters the oil inlet passage of the end cover through the oil inlet, passes through the second bearing of the intermediate shaft, flows into the oil inlet gap inside the motor shaft along the shaft body of the intermediate shaft, fully lubricates the rotor part, and improves the heat dissipation capacity of the rotor.

[0043] Furthermore, a plurality of first oil guide holes 17 are circumferentially opened on the side wall of the motor shaft 3. The first oil guide holes 17 extend vertically inward to form a first oil guide channel 18 communicating with the oil inlet gap 16. The first oil guide hole 17 has two circles corresponding to the stator coils on both sides. In this technical solution, when the motor is working, as the motor shaft rotates, the lubricating oil entering the hollow shaft is thrown out from the first oil guide hole along the first oil guide channel on the inner wall of the motor shaft through centrifugal force to lubricate the stator coil package, thereby improving the heat dissipation capacity of the stator.

[0044] Furthermore, a plurality of second oil guide holes 19 are circumferentially opened on the side wall of the motor shaft 3, and the second oil guide holes 19 extend obliquely inward to form a second oil guide channel 20 communicating with the oil inlet gap 16, and the second oil guide holes 19 have two circles and correspond to the inner ends of the first bearings 4 on both sides. In this technical solution, when the motor is working, as the motor shaft rotates, the lubricating oil entering the hollow shaft is thrown out from the second oil guide holes along the second oil guide channel on the inner wall of the motor shaft by centrifugal force to lubricate the first bearings on the front and rear sides, thereby improving the heat dissipation capacity of the first bearings on the front and rear sides.

[0045] Furthermore, one of the first bearings 4 is connected to the end cover 12, and the first bearing 4 is provided with a one-way seal at one end facing the second bearing 13. In this technical solution, the outer side of the first bearing at the rear side of the motor shaft is sealed by a seal 100 to prevent the lubricating oil from flowing into the motor cavity through the first bearing, thereby forming a range pressure difference to guide the lubricating oil in the motor cavity into the inside of the motor shaft.

[0046] Furthermore, the end cover 12 is also provided with an oil return channel 21, which connects the motor cavity 2 with the oil inlet channel. In this technical solution, part of the lubricating oil splashed from the stator softening oil circuit can enter the rotor lubricating oil circuit through the oil return channel on the end cover, and the falling lubricating oil flows to the reducer and the oil pump through the oil outlet window at the bottom of the housing. It should be noted here that the oil pump is connected to the oil outlet window.

[0047] Furthermore, the motor housing 1 further includes a connecting end plate 22 axially formed on the housing relative to the end cover 12, and the connecting end plate 22 extends and connects to the reducer housing and is constructed as a front end plate of the reducer. In this technical solution, the reducer and the motor share a connecting end plate, which serves as the front end plate of the reducer and the common housing, thereby reducing the installation space of the integrated structure in the axle direction and improving space utilization.

[0048] It should be noted here that if Figure 8 As shown, the housing oil circuit includes a housing oil passage and an oil outlet window.

[0049] In this specific embodiment, in view of the high cost of the existing motor and reducer oil cooling scheme, the complex process of the hollow shaft or the inability to cool the rotor well, the above scheme integrates the reducer and the motor, connects the two sets of lubricating oil circuits of the stator and the rotor in parallel, forms an oil circuit circulation between the reducer and the motor, and the stator and the rotor inside the motor are fully lubricated, thereby improving the overall heat dissipation capacity of the motor and improving the efficiency of the motor. In addition, the reducer and the motor share a connecting end plate, and the structure of the intermediate shaft connecting the differential removes the reducer input shaft, saves the bearing and the reducer input shaft oil seal, and reduces the installation space of the integrated structure in the axle direction in terms of space. In addition, the driving gear on the motor shaft directly drives the reducer intermediate shaft, reducing the mechanical loss of the spline connection between the reducer and the motor, directly transmitting power through the two-pole gear, and the input and output are coaxial and have high coaxiality. In addition, the motor shaft is a through-hole hollow shaft, which can be processed by various processes such as rotary forging or pipe material processing, and the shaft body diameter ratio is less affected, the coverage is large, and the matching (rotor core) surface is wide.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A coaxial oil-cooled motor structure with an integrated reducer, comprising a motor, the motor comprising a motor housing (1), a stator and a rotor, a motor cavity (2) being formed in the motor housing (1), the rotor comprising a motor shaft (3), and both sides of the motor shaft (3) being mounted on the motor housing (1) via two first bearings (4), characterized in that: It also includes a reducer installed on the front end side of the motor, the reducer including a reducer housing and a reduction intermediate shaft arranged in the reducer housing, a reducer cavity is formed in the reducer housing, the reducer housing is connected to the motor housing (1), a driving gear (5) is press-fitted on one end of the motor shaft (3) close to the reducer, and the driving gear (5) is meshed with the reduction intermediate shaft; A stator lubricating oil circuit and a rotor lubricating oil circuit which are in communication with the motor cavity (2) are formed inside the motor; an oil outlet window (6) is provided on a side wall of the motor housing (1) connected to the reducer; the oil outlet window (6) is in communication with the motor cavity (2) and the reducer cavity; and a housing oil passage (7) is axially constructed on the side wall of the motor housing (1); the housing oil passage (7) is in communication with the stator lubricating oil circuit and the reducer cavity.

2. The coaxial oil-cooled motor structure with integrated reducer according to claim 1 is characterized in that: The stator comprises a stator core, the stator lubricating oil circuit comprises an annular oil inlet groove (8) formed circumferentially on the side wall of the stator core, a plurality of oil outlet holes (9) are circumferentially constructed on both side walls of the annular oil inlet groove (8), the oil outlet holes (9) axially extending to the end surface of the stator core to form an oil injection channel communicating with the motor cavity (2); the motor housing (1) is provided with a short oil channel (10) connecting the housing oil channel (7) with the annular oil inlet groove (8).

3. The coaxial oil-cooled motor structure with integrated reducer according to claim 1 is characterized in that: The motor shaft (3) is a through-hole hollow shaft.

4. The coaxial oil-cooled motor structure with integrated reducer according to claim 3 is characterized in that: An intermediate shaft (11) is passed through the motor shaft (3), the motor housing (1) comprises a housing and an end cover (12) axially fixed to the housing, the intermediate shaft (11) is mounted on the end cover (12) via a second bearing (13), and both ends of the intermediate shaft (11) extend out of the motor shaft (3) and are assembled with a differential and a half shaft.

5. The coaxial oil-cooled motor structure with integrated reducer according to claim 4 is characterized in that: The end cover (12) is provided with an oil inlet (14) in communication with the oil pump, the rotor lubricating oil circuit comprises an oil inlet passage (15) in communication with the oil inlet (14) and arranged on the end cover (12), an oil inlet gap (16) is formed between the motor shaft (3) and the intermediate shaft (11), and the oil inlet passage (15), the second bearing (13) and the oil inlet gap (16) are in communication.

6. The coaxial oil-cooled motor structure with integrated reducer according to claim 5 is characterized in that: A plurality of first oil guide holes (17) are circumferentially formed on the side wall of the motor shaft (3); the first oil guide holes (17) extend vertically inward to form a first oil guide channel (18) communicating with the oil inlet gap (16); the first oil guide holes (17) have two circles corresponding to the stator coils on both sides respectively.

7. The coaxial oil-cooled motor structure with integrated reducer according to claim 6 is characterized in that: A plurality of second oil guide holes (19) are circumferentially formed on the side wall of the motor shaft (3). The second oil guide holes (19) extend obliquely inward to form a second oil guide channel (20) communicating with the oil inlet gap (16). The second oil guide holes (19) have two circles and correspond to the inner ends of the first bearings (4) on both sides respectively.

8. The coaxial oil-cooled motor structure with integrated reducer according to claim 7 is characterized in that: One of the first bearings (4) is connected to the end cover (12), and one end of the first bearing (4) facing the second bearing (13) is provided with a one-way seal.

9. The coaxial oil-cooled motor structure with integrated reducer according to claim 7, characterized in that: The end cover (12) is also provided with an oil return channel (21), and the oil return channel (21) is connected to the motor cavity (2) and the oil inlet channel.

10. The coaxial oil-cooled motor structure with integrated reducer according to claim 4, characterized in that: The motor housing (1) further comprises a connecting end plate (22) which is axially formed on the housing relative to the end cover (12); the connecting end plate (22) extends to be connected to the reducer housing and is constructed as a front end plate of the reducer.

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