Integrated motor shaft, electric driving structure and vehicle

Abstract

The utility model provides an integrated motor shaft, an electric driving structure and a vehicle, and relates to the technical field of vehicle parts. The integrated motor shaft is integrally formed by a motor rotating shaft and a speed reducer input shaft and comprises a shaft body, the shaft body comprises a first bearing assembling section, a second bearing assembling section and a third bearing assembling section which are sequentially arranged in the axial direction, and the third bearing assembling section is located at the end of the shaft body; the shaft body is provided with an oil channel which is through in the axial direction, two oil holes are formed in the inner wall of the oil channel, and the two oil holes both penetrate through the side wall of the shaft body and correspond to the first bearing assembly section and the second bearing assembly section in position respectively. The two oil holes guide oil out of the oil channel so as to provide lubricating oil for bearings of the first bearing assembly section and the second bearing assembly section correspondingly. An oil inlet pipe is inserted into a port, close to the third bearing assembly section, of the oil duct, the outer wall of the oil inlet pipe and the inner wall of the oil duct form an annular gap channel, and the gap channel guides oil out of the oil duct to provide lubricating oil for a bearing of the third bearing assembly section.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts technology, specifically to an integrated motor shaft, electric drive structure, and vehicle. Background Technology

[0002] In electric drive assemblies, the integrated motor shaft optimizes the transmission system structure by combining the motor shaft and the reducer input shaft into a single design. This structure reduces manufacturing costs by minimizing connecting components such as splines and assembly processes, while significantly improving the compactness and energy transfer efficiency of the transmission system, making it particularly suitable for electric drive scenarios with stringent space utilization requirements.

[0003] For the bearing configuration of an integrated motor shaft, the existing technology generally adopts a three-bearing support scheme. However, the lubrication structure of the three bearings is not integrated. The two bearings on both sides of the iron core mounting section use the corresponding lubrication scheme before integration. One of the bearings on the reducer side maintains splash lubrication. Splash lubrication has poor lubrication effect under low-speed conditions, which causes the bearing on the reducer side to fail to maintain a good lubrication effect. Utility Model Content

[0004] The problem solved by this invention is to optimize the bearing lubrication structure of an integrated motor shaft and maintain good lubrication of the three bearings.

[0005] To solve the above problems, this utility model provides an integrated motor shaft, electric drive structure and vehicle.

[0006] In a first aspect, the present invention provides an integrated motor shaft, which is integrally formed from a motor shaft and a reducer input shaft. The integrated motor shaft includes a shaft body, which includes a first bearing assembly section, a second bearing assembly section and a third bearing assembly section arranged sequentially along the axial direction. The third bearing assembly section is located at the end of the shaft body.

[0007] The shaft body is provided with an axially penetrating oil passage. The inner wall of the oil passage is provided with two oil holes. Both oil holes penetrate the side wall of the shaft body and correspond to the positions of the first bearing assembly section and the second bearing assembly section, respectively. The two oil holes are used to discharge oil through the oil passage to provide lubricating oil to the bearings of the first bearing assembly section and the second bearing assembly section, respectively.

[0008] An oil inlet pipe is inserted into the port of the oil passage near the third bearing assembly section. The outer wall of the oil inlet pipe and the inner wall of the oil passage form an annular gap channel. The gap channel is used to discharge oil from the oil passage to provide lubricating oil to the bearing of the third bearing assembly section.

[0009] Optionally, the oil passage includes a first channel and a second channel arranged axially and connected to each other; the first channel extends from the end where the third bearing assembly section is located to the side of the first bearing assembly section away from the second bearing assembly section; the diameter of the second channel is smaller than the diameter of the first channel; the oil inlet pipe is inserted into the first channel from the port of the first channel away from the second channel.

[0010] Optionally, the dimensions of the oil inlet pipe satisfy: d1-d2 < d1-d3;

[0011] Wherein, d1 is the inner diameter of the first channel; d2 is the outer diameter of the end of the oil inlet pipe that extends into the first channel; and d3 is the inner diameter of the second channel.

[0012] Optionally, the shaft body further includes a core mounting section and a gear shaft section, wherein the core mounting section is located between the first bearing assembly section and the second bearing assembly section, and the gear shaft section is located between the second bearing assembly section and the third bearing assembly section.

[0013] Optionally, one of the oil holes is located at one end of the first bearing assembly section near the iron core mounting section, and the other oil hole is located at one end of the second bearing assembly section near the gear shaft section.

[0014] Secondly, this utility model provides an electric drive structure, including a motor and a reducer, wherein the motor includes the aforementioned integrated motor shaft.

[0015] Optionally, there are two motors, the central axes of the integrated motor shafts of the two motors are on a straight line, and the third bearing assembly sections of the two integrated motor shafts are close to each other.

[0016] Optionally, it also includes a first bearing disposed on the first bearing assembly section, a second bearing disposed on the second bearing assembly section, and a third bearing disposed on the third bearing assembly section;

[0017] The first bearings on the two integrated motor shafts are respectively connected to the left and right end covers of the electric drive structure housing.

[0018] The second bearings on the two integrated motor shafts are respectively connected to the left motor housing and the right motor housing of the electric drive structure housing;

[0019] The third bearings on the two integrated motor shafts are respectively connected to the intermediate shell of the electric drive structure housing;

[0020] And / or, the first and second bearings are deep groove ball bearings; the third bearing is a cylindrical roller bearing;

[0021] And / or, the first bearing assembly section is provided with a left retaining ring, which is used to restrict the axial movement of the inner ring of the first bearing; a left pressure plate is provided on the left end cover, which is used to restrict the axial movement of the outer ring of the first bearing; a wave-shaped gasket is provided between the outer ring of the second bearing and the left motor housing.

[0022] Optionally, the two integrated motor shafts share a single oil inlet pipe, and the oil inlet pipe and the intermediate shell are an integral structure.

[0023] Thirdly, this utility model provides a vehicle including the aforementioned electric drive structure.

[0024] The advantages of this integrated motor shaft are as follows: the shaft body is sequentially arranged with a first bearing assembly section, a second bearing assembly section, and a third bearing assembly section along the axial direction, allowing for the installation of three bearings to achieve a three-bearing support structure. The third bearing assembly section is located at one end of the shaft body, where the gearbox-side bearing is installed. An axially penetrating oil passage is formed inside the shaft body, with two oil holes extending from the oil passage to the shaft surface on the inner wall of the middle section, thus forming two lubrication branches. An oil inlet pipe is inserted into the oil passage near the port of the third bearing assembly section to inject lubricating oil into the oil passage. The outer wall of the oil inlet pipe and the inner wall of the oil passage form an annular gap channel, allowing lubricating oil to flow out from the port of the oil passage along this gap channel to lubricate the bearing in the third bearing assembly section, i.e., the gearbox-side bearing. Simultaneously, some oil is diverted through the oil holes to form two lubrication branches, respectively lubricating the bearings in the first and second bearing assembly sections, achieving integrated oil supply lubrication for all three bearings from a single oil source.

[0025] This structure breaks through the traditional three-bearing separate lubrication scheme. It distributes oil to the three bearings through a single oil source via the shaft oil circuit, solving the problem of insufficient splash lubrication in low-speed conditions. It also realizes the integrated design of the three-bearing lubrication structure on the motor shaft, so that all three bearings have better lubrication effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the integrated motor shaft according to an embodiment of the present invention.

[0027] Figure 2 This is a partial structural schematic diagram of the electric drive structure according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the outer shell structure of the electric drive structure according to an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the oil inlet pipe structure of the electric drive structure according to an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 11. First bearing assembly section; 12. Second bearing assembly section; 13. Third bearing assembly section; 14. Iron core installation section; 141. Shaft shoulder; 15. Gear shaft section; 16. Groove section; 2. Oil passage; 21. First channel section; 22. Second channel section; 3. Oil hole; 4. Oil inlet pipe; 51. First bearing; 52. Second bearing; 53. Third bearing; 61. Left end cover; 62. Left motor housing; 63. Intermediate housing; 64. Left retaining ring; 65. Left pressure plate; 66. Waveform gasket; 67. Right end cover; 68. Right motor housing. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0033] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0034] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". "Several" refers to one or more "one or more".

[0035] like Figure 1As shown, this utility model embodiment provides an integrated motor shaft, which is integrally formed from a motor shaft and a reducer input shaft. The integrated motor shaft includes a shaft body, which includes a first bearing assembly section 11, a second bearing assembly section 12, and a third bearing assembly section 13 arranged sequentially along the axial direction. The third bearing assembly section 13 is located at the end of the shaft body. The shaft body is provided with an oil passage 2 that runs through the shaft along the axial direction. The inner wall of the oil passage 2 is provided with two oil holes 3, which both penetrate the side wall of the shaft body and correspond to the positions of the first bearing assembly section 11 and the second bearing assembly section 12, respectively. The two oil holes 3 are used to discharge oil through the oil passage 2 to provide lubricating oil to the bearings of the first bearing assembly section 11 and the second bearing assembly section 12, respectively. An oil inlet pipe 4 is inserted into the port of the oil passage 2 near the third bearing assembly section 13. The outer wall of the oil inlet pipe 4 and the inner wall of the oil passage 2 form an annular gap channel, which is used to discharge oil through the oil passage 2 to provide lubricating oil to the bearings of the third bearing assembly section 13.

[0036] In this embodiment, the shaft body is sequentially provided with a first bearing assembly section 11, a second bearing assembly section 12, and a third bearing assembly section 13 along the axial direction, which can install three bearings to realize a three-bearing support structure. The third bearing assembly section 13 is located at one end of the shaft body, that is, the gearbox-side bearing is installed on the third bearing assembly section 13. An axially penetrating oil passage 2 is opened inside the shaft body. Two oil holes 3 are arranged on the inner wall of the middle part of the oil passage 2, which leads from the oil passage 2 to the shaft surface, thus forming two lubrication branches. An oil inlet pipe 4 is inserted into the oil passage 2 near the port of the third bearing assembly section 13 to inject lubricating oil into the oil passage 2. The outer wall of the oil inlet pipe 4 and the inner wall of the oil passage 2 form an annular gap channel, so that the lubricating oil flows out from the port of the oil passage 2 along the gap channel to lubricate the bearing of the third bearing assembly section 13, that is, the gearbox-side bearing. At the same time, part of the oil is diverted through the oil holes 3 to form two lubrication branches, which respectively lubricate the bearings of the first bearing assembly section 11 and the second bearing assembly section 12, realizing integrated oil supply lubrication of three bearings from a single oil source.

[0037] This structure breaks through the traditional three-bearing separate lubrication scheme. It distributes oil to the three bearings through a single oil source via the shaft oil circuit, solving the problem of insufficient splash lubrication in low-speed conditions. It also realizes the integrated design of the three-bearing lubrication structure on the motor shaft, so that all three bearings have better lubrication effect.

[0038] It should be noted that the third bearing assembly section 13 is located at the end of the shaft body. That is, after the motor shaft and reducer input shaft are integrated, the third bearing assembly section 13 is positioned at the end of the shaft body adjacent to the gear shaft section 15, and the third bearing 53 mounted on it is relatively close to the shaft end. On one hand, lubricating oil overflowing through the annular gap channel flows directly into the inner ring of the third bearing 53 along the shaft end face and outer circumference to achieve lubrication; on the other hand, the end of the shaft body near the gear shaft section 15 is generally close to the housing, such as... Figure 2-4 As shown, the third bearing assembly section 13 is close to the intermediate housing 63, so that the lubricating oil flowing out from the annular gap channel can first flow to the inner wall of the intermediate housing 63 and then flow into the inner ring of the third bearing 53 to achieve lubrication. This design shortens the lubrication oil path by arranging it near the shaft end, and achieves secondary distribution of the lubricating medium by means of the integrated limiting structure of the intermediate housing 63, which significantly improves the lubrication reliability and system integration of the bearing under complex working conditions.

[0039] Optionally, the oil passage 2 includes a first passage 21 and a second passage 22 arranged axially and connected to each other; the first passage 21 extends from the end where the third bearing assembly section 13 is located to the side of the first bearing assembly section 11 away from the second bearing assembly section 12; the diameter of the second passage 22 is smaller than the diameter of the first passage 21; the oil inlet pipe 4 is inserted into the first passage 21 from the port of the first passage 21 away from the second passage 22.

[0040] In this optional embodiment, the shaft body has a composite oil circuit structure consisting of a first channel 21 and a second channel 22 at its core: the first channel 21 extends from the end where the third bearing assembly section 13 is located toward the first bearing assembly section 11, and its open end is connected to an oil inlet pipe 4; the diameter of the second channel 22 is smaller than that of the first channel 21, forming a variable diameter lubrication channel.

[0041] This stepped channel design has a dual function: under low-flow oil inlet conditions, the smaller inner diameter of the second channel 22 can prevent oil from flowing out, while maintaining a basic oil level in the first channel 21 to ensure continuous lubrication of the three bearings; under high-flow oil inlet conditions, after the oil storage space of the first channel 21 is filled, the oil can flow out through the second channel 22, which can not only remove more heat from the motor rotor, but also avoid excessive oil accumulation and churning losses.

[0042] Optionally, the dimensions of the oil inlet pipe 4 satisfy: d1-d2 < d1-d3; where d1 is the inner diameter of the first channel 21; d2 is the outer diameter of the end of the oil inlet pipe 4 that extends into the first channel 21; and d3 is the inner diameter of the second channel 22.

[0043] In this optional embodiment, the dimensions of the oil inlet pipe 4 are designed to satisfy the relationship: d1-d2 < d1-d3. This design, by controlling the diameter variation of the stepped bore, enables the first section of channel 21 to serve as the main oil reservoir and to form a three-stage lubrication circuit inside the shaft body. It should be noted that the insertion end of the oil inlet pipe 4 is coaxially arranged with the oil passage 2.

[0044] Optionally, the dimensions of the oil inlet pipe 4 satisfy: a < d1 - d2, where d1 is the inner diameter of the first channel 21 and d2 is the outer diameter of the end of the oil inlet pipe 4 that extends into the first channel 21.

[0045] In this optional embodiment, the dimensions of the oil inlet pipe 4 are designed to satisfy: a < d1 - d2. The minimum clearance is designed to allow impurity particles of a certain size to pass through the channel, ensuring that the oil can flow stably within the annular channel gap. It should be noted that the value of a is determined based on the difference in the inner diameter of the stepped orifice, the size of the particles in the oil, etc., and is generally 3-8 mm.

[0046] Optionally, the shaft body also includes a core mounting section 14 and a gear shaft section 15, with the core mounting section 14 located between the first bearing assembly section 11 and the second bearing assembly section 12, and the gear shaft section 15 located between the second bearing assembly section 12 and the third bearing assembly section 13.

[0047] In this optional embodiment, the shaft body mainly consists of five functionally integrated design sections, namely, the third bearing assembly section 13, the gear shaft section 15, the second bearing assembly section 12, the iron core mounting section 14, and the first bearing assembly section 11. The gear shaft section 15 forms a meshing transmission pair with the gear inside the reducer. The iron core mounting section 14 is used for pressing the motor rotor iron core to realize the integration of the motor shaft and the reducer input shaft.

[0048] Optionally, one oil hole 3 is located at one end of the first bearing assembly section 11 near the iron core mounting section 14, and the other oil hole 3 is located at one end of the second bearing assembly section 12 near the gear shaft section 15.

[0049] In addition, the two oil holes 3 can be arranged radially along the shaft body or at an angle, depending on actual needs. A shoulder 141 is provided at the end of the iron core mounting section 14 near the second bearing assembly section 12, and a groove section 16 is provided between the second bearing assembly section 12 and the gear shaft section 15.

[0050] This utility model embodiment also provides an electric drive structure, including a motor and a reducer, wherein the motor includes the aforementioned integrated motor shaft. The technical improvements and technical effects of the motor are the same as those of the integrated motor shaft.

[0051] Optionally, such as Figure 2 and Figure 3As shown, there are two motors, and the central axes of the two integrated motor shafts are on a straight line, with the third bearing assembly section 13 of the two integrated motor shafts close to each other. The electric drive structure adopts a dual-motor symmetrical layout, and there are also two corresponding reducers. The two sets of shaft systems are suitable for high-performance electric drive scenarios.

[0052] Optionally, such as Figure 2 and Figure 3 As shown, the electric drive structure also includes a first bearing 51 disposed on the first bearing assembly section 11, a second bearing 52 disposed on the second bearing assembly section 12, and a third bearing 53 disposed on the third bearing assembly section 13; the first bearings 51 on the two integrated motor shafts are respectively connected to the left end cover 61 and the right end cover 67 of the electric drive structure housing; the second bearings 52 on the two integrated motor shafts are respectively connected to the left motor housing 62 and the right motor housing 68 of the electric drive structure housing; and the third bearings 53 on the two integrated motor shafts are respectively connected to the middle housing 63 of the electric drive structure housing.

[0053] Specifically, the first bearing assembly section 11 is provided with a first bearing 51. The inner ring of the first bearing 51 can be fitted with the first bearing assembly section 11 with a transition fit, and the outer ring can be fitted with the left end cover 61 or the right end cover 67 with a clearance fit. The second bearing assembly section 12 is provided with a second bearing 52. The inner ring of the second bearing 52 can be fitted with the second bearing assembly section 12 with an interference fit, and the outer ring can be fitted with the left motor housing 62 or the right motor housing 68 with a clearance fit. The third bearing assembly section 13 is provided with a third bearing 53. The inner ring of the third bearing 53 can be fitted with the third bearing assembly section 13 with an interference fit, and the outer ring can be fitted with the intermediate housing 63 with an interference fit.

[0054] Additionally, the first bearing assembly section 11 is equipped with a left retaining ring 64, which restricts the axial movement of the inner ring of the first bearing 51. A left pressure plate 65 is provided on the left end cover 61, which restricts the axial movement of the outer ring of the first bearing 51. A corrugated shim 66 is provided between the outer ring of the second bearing 52 and the left motor housing 62. Furthermore, a bearing end cover is also installed on the outside of the left end cover 61 or the right end cover 67 to position the outer ring of the first bearing 51.

[0055] By employing the aforementioned bearing constraint method, both the axial force of the motor shaft is offset, and the initial bearing clearance is eliminated. Axial force offset: The first bearing 51 is a fully constrained bearing. The inner ring restricts axial movement through the left retaining ring 64, and the outer ring restricts axial movement through the left pressure plate 65. Therefore, when the shaft body is subjected to axial force, it is completely offset by the first bearing 51. Clearance elimination: After the corrugated shim 66 is compressed, it comes into contact with the outer ring of the second bearing 52, giving the second bearing 52 an axial force. This ensures that the outer ring of the second bearing 52 is always in contact with the internal rolling balls, thereby eliminating the clearance caused by clearance. In addition, the axial force generated by the corrugated shim 66 can be transmitted to the inner ring of the first bearing 51 through the shaft body, ensuring that the inner ring of the first bearing 51 is always in contact with the internal rolling balls, thereby eliminating the clearance of the first bearing 51.

[0056] It should be noted that this electric drive structure consists of two motors and corresponding reduction gear structures integrated together. For example... Figure 3 As shown, two motors are located on both sides, namely the left motor housing 62 and the right motor housing 68. The outer shell corresponding to the reduction structure in the middle is the middle shell 63, which can also be called the reducer housing. The left end cover 61, the right end cover 67, the left motor housing 62, the right motor housing 68 and the middle shell 63 are connected together to form the outer shell of the electric drive structure.

[0057] In addition, the first bearing 51 and the second bearing 52 can both be deep groove ball bearings; the third bearing 53 is a cylindrical roller bearing, which can be separated for easy installation.

[0058] During installation, due to the symmetrical structure on both sides, the installation process is the same. Taking the left side as an example, the process is described as follows: First, the inner rings of the first bearing 51, the second bearing 52, and the third bearing 53 are pre-pressed onto the shaft body, and the outer ring of the third bearing 53 is press-fitted onto the intermediate housing 63. Then, the first bearing 51 and the shaft body are installed together into the left end cover 61, and the left pressure plate 65 and the left end cover 61 are fixed with bolts. Finally, the pre-assembled shaft assembly and the left end cover 61 are inserted into the left motor housing 62, achieving the fit between the outer ring of the second bearing 52 and the left motor housing 62, as well as the fit between the inner and outer rings of the third bearing 53. The outer ring end face of the second bearing 52 is in contact with the corrugated washer 66, and the other end of the corrugated washer 66 is in contact with the left motor housing 62, eliminating bearing clearance. Additionally, a bearing end cover is installed on the outside of the left end cover 61 to complete the final assembly and positioning.

[0059] Optionally, such as Figure 2 and Figure 4 As shown, the two integrated motor shafts share a single oil inlet pipe 4, and the oil inlet pipe 4 and the intermediate shell 63 are an integrated structure.

[0060] The two integrated motor shafts share the same oil inlet pipe 4, which is formed by the extension of the intermediate shell 63. An oil circuit is set inside the shell for oil supply, which is a clever structural design.

[0061] This invention provides a vehicle including the aforementioned electric drive structure. The technical improvements and effects of the vehicle are the same as those of the electric motor.

[0062] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. An integrated motor shaft, characterized in that, The integrated motor shaft is formed by integrally molding a motor shaft and a reducer input shaft. The integrated motor shaft includes a shaft body, which includes a first bearing assembly section (11), a second bearing assembly section (12), and a third bearing assembly section (13) arranged sequentially along the axial direction. The third bearing assembly section (13) is located at the end of the shaft body. The shaft body is provided with an axially penetrating oil passage (2). The inner wall of the oil passage (2) is provided with two oil holes (3). Both oil holes (3) penetrate the side wall of the shaft body and correspond to the positions of the first bearing assembly section (11) and the second bearing assembly section (12), respectively. The two oil holes (3) are used to discharge oil from the oil passage (2) to provide lubricating oil to the bearings of the first bearing assembly section (11) and the second bearing assembly section (12), respectively. An oil inlet pipe (4) is inserted into the port of the oil passage (2) near the third bearing assembly section (13). The outer wall of the oil inlet pipe (4) and the inner wall of the oil passage (2) form an annular gap channel. The gap channel is used to discharge oil from the oil passage (2) to provide lubricating oil to the bearing of the third bearing assembly section (13).

2. The integrated motor shaft according to claim 1, characterized in that, The oil passage (2) includes a first section (21) and a second section (22) arranged axially and connected to each other; the first section (21) extends from the end where the third bearing assembly section (13) is located to the side of the first bearing assembly section (11) away from the second bearing assembly section (12); the diameter of the second section (22) is smaller than the diameter of the first section (21); the oil inlet pipe (4) is inserted into the first section (21) from the port of the first section (21) away from the second section (22).

3. The integrated motor shaft according to claim 2, characterized in that, The dimensions of the oil inlet pipe (4) satisfy: d1-d2 < d1-d3; Wherein, d1 is the inner diameter of the first channel (21); d2 is the outer diameter of the end of the oil inlet pipe (4) that extends into the first channel (21); and d3 is the inner diameter of the second channel (22).

4. The integrated motor shaft according to claim 1, characterized in that, The shaft body also includes a core mounting section (14) and a gear shaft section (15). The core mounting section (14) is located between the first bearing assembly section (11) and the second bearing assembly section (12), and the gear shaft section (15) is located between the second bearing assembly section (12) and the third bearing assembly section (13).

5. The integrated motor shaft according to claim 4, characterized in that, One of the oil holes (3) is located at one end of the first bearing assembly section (11) near the iron core mounting section (14), and the other oil hole (3) is located at one end of the second bearing assembly section (12) near the gear shaft section (15).

6. An electrically driven structure, characterized in that, It includes a motor and a reducer, wherein the motor includes an integral motor shaft as described in any one of claims 1-5.

7. The electric drive structure according to claim 6, characterized in that, There are two motors in total, and the central axes of the integrated motor shafts of the two motors are on a straight line, and the third bearing assembly section (13) of the two integrated motor shafts are close to each other.

8. The electric drive structure according to claim 7, characterized in that, It also includes a first bearing (51) disposed on the first bearing assembly section (11), a second bearing (52) disposed on the second bearing assembly section (12), and a third bearing (53) disposed on the third bearing assembly section (13); The first bearings (51) on the two integrated motor shafts are respectively connected to the left end cover (61) and the right end cover (67) of the electric drive structure housing; The second bearings (52) on the two integrated motor shafts are respectively connected to the left motor housing (62) and the right motor housing (68) of the electric drive structure housing; The third bearings (53) on the two integrated motor shafts are respectively connected to the intermediate shell (63) of the electric drive structure housing; And / or, the first bearing (51) and the second bearing (52) are deep groove ball bearings; the third bearing (53) is a cylindrical roller bearing; And / or, the first bearing assembly section (11) is provided with a left retaining ring (64), which is used to restrict the axial movement of the inner ring of the first bearing (51); a left pressure plate (65) is provided on the left end cover (61), which is used to restrict the axial movement of the outer ring of the first bearing (51); a wave-shaped gasket (66) is provided between the outer ring of the second bearing (52) and the left motor housing (62).

9. The electric drive structure according to claim 8, characterized in that, The two integrated motor shafts share a single oil inlet pipe (4), and the oil inlet pipe (4) and the intermediate shell (63) are an integrated structure.

10. A vehicle, characterized in that, Includes the electric drive structure as described in any one of claims 6-9.

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