Rotor oil way structure

Abstract

The utility model discloses a rotor oil way structure which comprises a speed reducer input shaft, an inner cavity and a cavity wall, the inner cavity penetrates through the speed reducer input shaft, and the cavity wall comprises a first end and a second end. The motor rotor shaft comprises a first part and a second part, the first part is arranged in the inner cavity, one end, close to the first end, of the first part comprises a first chamfer, a first flush part and a second chamfer which are connected in sequence, and the first chamfer, the first flush part and the second chamfer are separately arranged with the cavity wall at intervals; the second part is close to the second end and used for being connected with a motor rotor, and the second part and the first part are integrally formed; the hollow inner cavity penetrates through the first part and the second part; and the oil inlet hole is communicated with the hollow inner cavity. According to the utility model, the motor rotor shaft and the rotor oil delivery pipe can be integrated, the first part of the motor rotor shaft has a mounting and positioning characteristic, additional mounting and positioning characteristics are not needed, the number of parts and related manufacturing cost are reduced to the greatest extent, the same oil way function is achieved, and the cost advantage is very high.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-cooled electric drive, in particular to a rotor oil circuit structure. Background Art

[0002] In the reducer of the prior art, since the motor rotor shaft and the rotor oil pipe are located inside the reducer, the assembly process of the motor rotor shaft and the rotor oil pipe cannot be directly observed by naked eyes, and a guide rod is needed to help install the rotor oil pipe and the motor rotor shaft. First, the assembler inserts the guide rod into the oil inlet hole, and then inserts the rotor oil pipe and the motor rotor shaft in turn, and then pulls out the guide rod after the assembly is completed. This assembly process requires relevant installation positioning features, and the assembly process is relatively complicated, so there is no advantage in cost and assembly process. Utility Model Content

[0003] The purpose of the utility model is to solve the problem that the assembly process of the motor rotor shaft and the rotor oil pipe is relatively complicated. The utility model provides a rotor oil circuit structure, which can integrate the motor rotor shaft and the rotor oil pipe, and the first part of the motor rotor shaft has an installation positioning feature, without the need for additional related installation positioning features, which reduces the number of parts and related manufacturing costs to the greatest extent, achieving the same oil circuit function and having a very high cost advantage.

[0004] In order to solve the above technical problems, the embodiment of the utility model discloses a rotor oil circuit structure, including:

[0005] A reducer input shaft, comprising an inner cavity, the inner cavity comprising a cavity wall, the inner cavity passes through the reducer input shaft, and the cavity wall of the inner cavity comprises a first end and a second end;

[0006] The motor rotor shaft comprises:

[0007] A first part, wherein the first part is disposed in the inner cavity, and an end of the first part close to the first end comprises a first chamfer, a first flush portion, and a second chamfer connected in sequence, and the first chamfer, the first flush portion, and the second chamfer are respectively spaced apart from the cavity wall;

[0008] a second part, the second part being close to the second end, the second part being used to be connected to the motor rotor, and the second part being integrally formed with the first part;

[0009] a hollow inner cavity, wherein the hollow inner cavity passes through the first part and the second part;

[0010] An oil inlet hole is located near the first end and is communicated with the hollow inner cavity.

[0011] By adopting the above technical solution, the motor rotor shaft and the rotor oil pipeline in the prior art are integrated into the motor rotor shaft in this technical solution, and the original rotor oil pipeline becomes the first part of the motor rotor shaft in this technical solution.

[0012] One end of the first part of the motor rotor shaft includes a first chamfer, a first flush portion, and a second chamfer connected in sequence. When assembling the motor rotor shaft, since the inner diameter of the first end of the inner cavity of the reducer input shaft near the oil inlet hole is smaller, the assembly space of the end of the first part of the motor rotor shaft near the oil inlet hole is smaller. The end of the first part of the motor rotor shaft near the oil inlet hole includes a first chamfer, a first flush portion, and a second chamfer connected in sequence, that is, the first chamfer is located at the front end. The first chamfer has the characteristics of being narrow in front and wide in the back, and the first chamfer is spaced apart from the cavity wall of the inner cavity of the reducer input shaft by a certain gap, so that the first part can be better introduced.

[0013] Since the first chamfer, the first flush portion and the second chamfer are connected in sequence and are spaced apart from the cavity wall of the inner cavity of the reducer input shaft by a certain gap, that is, the gap between the first flush portion and the cavity wall is smaller than the gap between the first chamfer and the cavity wall, that is, the first flush portion has a smaller space to move in the inner cavity of the reducer input shaft, which limits the shaking and deviation of the first part in the radial direction, so the first flush portion has a corresponding guiding effect. After the first flush portion completes the guiding process, the second chamfer makes the first part easier to assemble and push forward, and can be better introduced.

[0014] In the prior art, the rotor oil pipe and the motor rotor shaft are two independent components and need to be installed separately. Therefore, when installing the rotor oil pipe and the motor rotor shaft, it is first necessary to align the reducer input shaft with the rotor oil pipe to install the rotor oil pipe, and after the installation of the rotor oil pipe is completed, the motor rotor shaft is installed. When installing the motor rotor shaft, the motor rotor shaft needs to be aligned with the rotor oil pipe and the reducer input shaft respectively. In addition, since the rotor oil pipe and the motor rotor shaft are two independent components, in order to realize the oil guide function, relevant seals need to be added between the rotor oil pipe and the motor rotor shaft to achieve sealing.

[0015] In the present technical solution, the motor rotor shaft has a hollow inner cavity, the hollow inner cavity passes through the first part and the second part of the motor rotor shaft, and the hollow inner cavity is connected to the oil inlet hole, therefore, the hollow inner cavity can be used as an oil-conducting cavity as a part of the oil circuit, and the first part of the motor rotor shaft also has corresponding oil circuit characteristics. Therefore, the first part of the motor rotor shaft serves as a rotor oil pipeline. Moreover, since the first part and the second part of the motor rotor shaft are integrally formed, no additional seal is required, and the relevant seal is cancelled. The first part of the motor rotor shaft is located in the inner cavity of the reducer input shaft, and there is no need for the alignment and installation process of the reducer input shaft and the rotor oil pipeline, nor is there a need for the alignment and installation process of the rotor oil pipeline and the motor rotor shaft. It is only necessary to align the reducer input shaft with the first part of the motor rotor shaft, thereby minimizing the radial eccentricity of the reducer end oil circuit and the motor rotor end oil circuit, and further improving the stability of the rotor cooling oil circuit.

[0016] According to another specific embodiment of the utility model, the first chamfer includes a third end and a fourth end, the second chamfer includes a fifth end and a sixth end, along the radial direction, the distance from the third end to the cavity wall is greater than the distance from the fourth end to the cavity wall, the distance from the sixth end to the cavity wall is greater than the distance from the fifth end to the cavity wall, and the fourth end and the fifth end are respectively connected to the first flush portion.

[0017] According to another specific embodiment of the present invention, the projection length of the first chamfer in the radial direction is greater than or equal to 5 mm.

[0018] By adopting the above technical solution, in order to better guide the first part, the projection length of the first chamfer in the radial direction needs to be long enough to meet the guide function, and the projection length needs to be greater than or equal to 5 mm.

[0019] According to another specific embodiment of the present utility model, the projection length of the first flush portion in the radial direction is 10-20 mm.

[0020] With the above technical solution, since the gap between the first flush portion and the wall of the inner cavity of the reducer input shaft is small, if the length of the first flush portion is too short, the condition of limiting the shaking and deviation of the first part in the radial direction in the inner cavity of the reducer input shaft by the first flush portion cannot be met, and the corresponding guiding effect is lost; if the length of the first flush portion is too long, the machining accuracy of the inner cavity diameter of the reducer input shaft, that is, the concentricity requirement will be too high.

[0021] According to another specific embodiment of the present utility model, the motor rotor shaft includes a second flush portion, the first chamfer, the first flush portion, the second chamfer and the second flush portion are connected in sequence, the second flush portion is spaced apart from the cavity wall, and along the radial direction, the distance from the second flush portion to the cavity wall is greater than the distance from the first flush portion to the cavity wall.

[0022] By adopting the above technical solution, after the assembly process of the first chamfer, the first flush portion and the second chamfer is completed, the second flush portion no longer needs to have a guide feature. Therefore, in order to reduce the machining accuracy of the inner cavity diameter of the reducer input shaft, the distance from the second flush portion to the cavity wall needs to be greater than the distance from the first flush portion to the cavity wall, thereby reserving space for the machining deviation of the inner cavity diameter of the reducer input shaft.

[0023] According to another specific embodiment of the utility model, the rotor oil circuit structure includes a shell, the shell includes an oil inlet, the oil inlet includes the oil inlet hole, the oil inlet is inserted into the hollow inner cavity of the first part, and there is a first axial gap between the oil inlet and the hollow inner cavity in the axial direction, and there is a first radial gap between the oil inlet and the hollow inner cavity in the radial direction; along the axial direction, a first bearing is provided at one end of the reducer input shaft, the first bearing is interference fit with the reducer input shaft, the first bearing is small clearance fit with the shell, and there is a second axial gap between the first bearing and the shell; the oil inlet hole, the first axial gap, the first radial gap and the second axial gap define a first oil circuit, and the first oil circuit is used to transport lubricating oil to the first bearing.

[0024] By adopting the above technical solution, in the first oil circuit, the lubricating oil enters the first axial gap between the oil inlet piece and the hollow inner cavity from the oil inlet piece of the outer casing through the oil inlet hole, and then the oil flows into the first radial gap between the oil inlet piece and the hollow inner cavity, and then enters the second axial gap between the first bearing and the outer casing, thereby delivering the lubricating oil to the first bearing to lubricate the first bearing.

[0025] According to another specific embodiment of the present invention, the second axial gap distance is 40 μm to 60 μm.

[0026] With the above technical solution, if the second axial gap between the first bearing and the housing is too small, the lubricating oil cannot lubricate the first bearing through the second axial gap; if the second axial gap between the first bearing and the housing is too large, the first bearing will loosen.

[0027] According to another specific embodiment of the utility model, the first part includes a spline, the first part and the cavity wall of the reducer input shaft are connected through the spline, the first part includes a plurality of first oil holes, the plurality of first oil holes are located between the spline and the second end, the plurality of first oil holes are connected to the hollow inner cavity, and a third radial gap exists between the plurality of first oil holes and the first part; the hollow inner cavity, the plurality of first oil holes and the third radial gap define a second oil circuit, and the second oil circuit is used to transport lubricating oil to the spline.

[0028] By adopting the above technical solution, in the second oil circuit, the lubricating oil enters the third radial gap between the first oil hole and the first part from the hollow inner cavity through the first oil hole, and then the oil flows into the spline connection between the cavity wall of the reducer input shaft and the first part, thereby transporting the lubricating oil to the spline to lubricate the spline connection.

[0029] According to another specific embodiment of the utility model, the first part includes a mating surface, the mating surface is located between the first oil hole and the second end, the mating surface is provided with a plurality of oil guide grooves, and the mating surface is clearance-matched with the reducer input shaft; the hollow inner cavity, the plurality of first oil holes and the plurality of oil guide grooves define a third oil circuit, and the third oil circuit is used to transport lubricating oil to the mating surface.

[0030] By adopting the above technical solution, in the third oil circuit, the lubricating oil enters the oil guide groove of the mating surface of the first part from the hollow inner cavity through the first oil hole, thereby transporting the lubricating oil to the mating surface to lubricate the mating surface.

[0031] According to another specific embodiment of the utility model, a second bearing is provided at the other end of the reducer input shaft, and the second bearing is connected to the reducer input shaft. Along the radial direction, the second bearing, the reducer input shaft and the first part are arranged in sequence, and there is a fourth axial gap between the second bearing and the motor rotor shaft; the hollow inner cavity, the multiple first oil holes, the multiple oil guide grooves and the fourth axial gap define a fourth oil circuit, and the fourth oil circuit is used to transport lubricating oil to the second bearing.

[0032] By adopting the above technical solution, in the fourth oil circuit, the lubricating oil enters the oil guide groove of the mating surface of the first part from the hollow inner cavity through the first oil hole, and then the oil flows into the fourth axial gap between the second bearing and the motor rotor shaft, thereby delivering the lubricating oil to the second bearing to lubricate the second bearing.

[0033] According to another specific implementation of the utility model, the second oil circuit, the third oil circuit and the fourth oil circuit of the rotor oil circuit structure are interconnected.

[0034] According to another specific embodiment of the utility model, the second part includes a plurality of second oil holes, which are connected to the hollow inner cavity; the hollow inner cavity and the plurality of second oil holes define a fifth oil circuit, and the fifth oil circuit is used to transport lubricating oil to the motor rotor and windings.

[0035] By adopting the above technical solution, in the fifth oil circuit, the lubricating oil flows from the hollow inner cavity into the motor rotor and windings via the second oil hole, thereby delivering the lubricating oil to the motor rotor and windings to lubricate and cool the motor rotor and windings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A cross-sectional view showing the rotor oil circuit structure of an embodiment of the utility model.

[0037] Figure 2a Show the utility model embodiment Figure 1 A partial enlarged view of area A.

[0038] Figure 2b Show the utility model embodiment Figure 2a A partial enlarged view of the D area in the middle.

[0039] Figure 2c Show the utility model embodiment Figure 2a Schematic diagram of region D in center.

[0040] Figure 2d Show the utility model embodiment Figure 2a Schematic diagram of region E in the middle.

[0041] Figure 3 A cross-sectional view of the input shaft of the reducer according to an embodiment of the present utility model is shown.

[0042] Figure 4 A cross-sectional view of a housing and a motor rotor shaft according to an embodiment of the utility model is shown.

[0043] Figure 5 Show the utility model embodiment Figure 1 A partial enlarged view of area B.

[0044] Figure 6 A three-dimensional view of the rotor shaft of the motor according to an embodiment of the utility model is shown.

[0045] Figure 7 Show the utility model embodiment Figure 1 A partial enlarged view of the middle C area.

[0046] Description of Reference Numerals

[0047] Rotor oil circuit structure 1;

[0048] Housing 2; oil inlet 21; oil inlet hole 211;

[0049] reducer input shaft 3; inner cavity 31; cavity wall 311; first end 3111; second end 3112; first bearing 32; second axial gap 321; second bearing 33; fourth axial gap 331;

[0050] Motor rotor shaft 4;

[0051] first portion 41; first chamfer 411; third end 4111; fourth end 4112; first flush portion 412; second chamfer 413; fifth end 4131; sixth end 4132; second flush portion 414; spline 415; first oil hole 416; third radial gap 4161; mating surface 417; oil guide groove 4171;

[0052] Second portion 42; second oil hole 421;

[0053] Hollow inner cavity 43; first axial gap 431; first radial gap 432;

[0054] First oil circuit 5;

[0055] Second oil circuit 6;

[0056] The third oil circuit 7;

[0057] Fourth oil line 8;

[0058] Fifth oil circuit 9. DETAILED DESCRIPTION

[0059] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0060] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0061] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model 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 cannot be understood as a limitation on the utility model.

[0062] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0063] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" 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 indirectly connected 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 this embodiment can be understood according to specific circumstances.

[0064] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0065] refer to Figure 1 The present application provides a rotor oil circuit structure 1, comprising a housing 2, a reducer input shaft 3 and a motor rotor shaft 4. Exemplarily, the motor rotor shaft 4 is inserted into the reducer input shaft 3, along the axial direction ( Figure 1 The housing 2 is arranged on the left side of the reducer input shaft 3.

[0066] Among them, reference Figures 2a to 3 The housing 2 includes an oil inlet 21, and the oil inlet 21 includes an oil inlet hole 211. The reducer input shaft 3 includes an inner cavity 31, and the inner cavity 31 includes a cavity wall 311. The inner cavity 31 is along the axial direction ( Figure 3 The inner cavity 31 has a cavity wall 311 including a first end 3111 and a second end 3112 , and the oil inlet hole 211 is close to the first end 3111 .

[0067] refer to Figure 1 , Figure 3 and Figure 4The motor rotor shaft 4 includes a first portion 41, a second portion 42 and a hollow inner cavity 43. The first portion 41 is arranged in the inner cavity 31. The end of the first portion 41 close to the first end 3111 includes a first chamfer 411, a first flush portion 412 and a second chamfer 413 connected in sequence. The first chamfer 411, the first flush portion 412 and the second chamfer 413 are respectively spaced apart from the cavity wall 311; the second portion 42 is close to the second end 3112, and the second portion 42 is used to connect with the motor rotor (not shown in the figure). The second portion 42 is integrally formed with the first portion 41; the hollow inner cavity 43 runs through the first portion 41 and the second portion 42, and the oil inlet member 21 is inserted into the hollow inner cavity 43 of the first portion 41. The oil inlet member 21 is close to the first end 3111, and the oil inlet hole 211 is connected to the hollow inner cavity 43.

[0068] By adopting the above technical solution, the motor rotor shaft and the rotor oil pipe in the prior art are integrated into the motor rotor shaft 4 in this technical solution, and the original rotor oil pipe becomes the first part 41 of the motor rotor shaft 4 in this technical solution.

[0069] One end of the first part 41 of the motor rotor shaft 4 includes a first chamfer 411, a first flush portion 412, and a second chamfer 413 connected in sequence. When assembling the motor rotor shaft 4, since the inner diameter of the first end 3111 of the inner cavity 31 of the reducer input shaft 3 close to the oil inlet hole 211 is smaller, the assembly space of the end of the first part 41 of the motor rotor shaft 4 close to the oil inlet hole 211 is smaller. The end of the first part 41 of the motor rotor shaft 4 close to the oil inlet hole 211 includes a first chamfer 411, a first flush portion 412, and a second chamfer 413 connected in sequence, that is, the first chamfer 411 is located at the front end. The first chamfer 411 has the characteristics of being narrow in front and wide in the back, and the first chamfer 411 is spaced apart from the cavity wall 311 of the inner cavity 31 of the reducer input shaft 3 by a certain gap, so that the first part 41 is better introduced.

[0070] Since the first chamfer 411, the first flush portion 412 and the second chamfer 413 are connected in sequence and are spaced apart from the cavity wall 311 of the inner cavity 31 of the reducer input shaft 3 by a certain gap, that is, the gap between the first flush portion 412 and the cavity wall 311 is smaller than the gap between the first chamfer 411 and the cavity wall 311, that is, the space for the first flush portion 412 to move in the inner cavity 31 of the reducer input shaft 3 is small, which limits the first portion 41 in the radial direction ( Figure 1 The first flush portion 412 has a corresponding guiding function. When the first flush portion 412 completes the guiding process, the second chamfer 413 makes the first portion 41 easy to assemble and advance, and can be better introduced.

[0071] In the prior art, the rotor oil pipe and the motor rotor shaft are two independent components and need to be installed separately. When installing the rotor oil pipe and the motor rotor shaft, it is first necessary to align the reducer input shaft with the rotor oil pipe to install the rotor oil pipe. After the installation of the rotor oil pipe is completed, the motor rotor shaft is installed. When installing the motor rotor shaft, the motor rotor shaft needs to be aligned with the rotor oil pipe and the reducer input shaft respectively. In addition, since the rotor oil pipe and the motor rotor shaft are two independent components, in order to realize the oil guide function, relevant seals need to be added between the rotor oil pipe and the motor rotor shaft to achieve sealing.

[0072] In the present technical solution, the motor rotor shaft 4 has a hollow inner cavity 43, the hollow inner cavity 43 passes through the first part 41 and the second part 42 of the motor rotor shaft 4, and the hollow inner cavity 43 is connected to the oil inlet hole 211. Therefore, the hollow inner cavity 43 can be used as a cavity for guiding oil as part of the oil circuit, and the first part 41 of the motor rotor shaft 4 also has the corresponding oil circuit characteristics, so the first part 41 of the motor rotor shaft 4 is used as a rotor oil pipe. In addition, the first part 41 and the second part 42 of the motor rotor shaft 4 are integrally formed, and no additional seal is required, thus eliminating the relevant seal. The first part 41 of the motor rotor shaft 4 is located in the inner cavity 31 of the reducer input shaft 3, and there is no need for the alignment and installation process of the reducer input shaft and the rotor oil pipe, nor is there a need for the alignment and installation process of the rotor oil pipe and the motor rotor shaft. It is only necessary to align the reducer input shaft 3 with the first part 41 of the motor rotor shaft 4, thereby minimizing the radial eccentricity of the reducer end oil circuit and the motor rotor end oil circuit, and further improving the stability of the rotor cooling oil circuit.

[0073] In some possible implementations, reference Figure 2a to Figure 2c The first chamfer 411 includes a third end 4111 and a fourth end 4112, and the second chamfer 413 includes a fifth end 4131 and a sixth end 4132. Figure 2c In the X direction), the distance d1 from the third end 4111 to the cavity wall 311 is greater than the distance d2 from the fourth end 4112 to the cavity wall 311, the distance d3 from the sixth end 4132 to the cavity wall 311 is greater than the distance d4 from the fifth end 4131 to the cavity wall 311, and the fourth end 4112 and the fifth end 4131 are respectively connected to the first flush portion 412. The distance d2 from the fourth end 4112 to the cavity wall 311 and the distance d4 from the fifth end 4131 to the cavity wall 311 are as small as possible and close to zero.

[0074] By adopting the above technical solution, the distance d2 from the fourth end 4112 to the cavity wall 311 and the distance d4 from the fifth end 4131 to the cavity wall 311 are as small as possible, close to zero, so that the lubricating oil rarely enters the gap between the first flush portion 412 and the cavity wall 311, or even does not enter the gap.

[0075] It should be noted that the embodiment of the present application does not specifically limit the distance d1 from the third end 4111 to the cavity wall 311. For example, in other possible embodiments, the distance d1 from the third end 4111 to the cavity wall 311 may be 1 mm, 2 mm, etc. The embodiment of the present application does not specifically limit the distance d2 from the fourth end 4112 to the cavity wall 311. For example, in other possible embodiments, the distance d2 from the fourth end 4112 to the cavity wall 311 may be 0.5 mm, 1 mm, etc. The embodiment of the present application does not specifically limit the distance d3 from the sixth end 4132 to the cavity wall 311. For example, in other possible embodiments, the distance d3 from the sixth end 4132 to the cavity wall 311 may be 1 mm, 2 mm, etc. The embodiment of the present application does not specifically limit the distance d4 from the fifth end 4131 to the cavity wall 311. For example, in other possible embodiments, the distance d4 from the fifth end 4131 to the cavity wall 311 may be 0.5 mm, 1 mm, etc.

[0076] In some possible implementations, reference Figure 2b and Figure 2c , the first chamfer 411 is in the radial direction ( Figure 2c The projection length l1 in the X direction) is greater than or equal to 5 mm.

[0077] With the above technical solution, in order to better enable the first portion 41 to be introduced, the projection length of the first chamfer 411 in the radial direction needs to be long enough to meet the introduction function, and the projection length needs to be greater than or equal to 5 mm.

[0078] It should be noted that the embodiment of the present application does not impose any specific limitation on the projection length l1 of the first chamfer 411 in the radial direction. For example, in other possible implementations, the projection length l1 of the first chamfer 411 in the radial direction may be 5 mm, 6 mm, 7 mm, etc.

[0079] In some possible implementations, reference Figure 2b and Figure 2c , the first flush portion 412 is in the radial direction ( Figure 2c The projection length l2 in the X direction is 10 to 20 mm.

[0080] With the above technical solution, since the gap between the first flush portion 412 and the cavity wall 311 of the inner cavity 31 of the reducer input shaft 3 is small, if the length l2 of the first flush portion 412 is too short, the first flush portion 412 cannot limit the first portion 41 in the inner cavity 31 of the reducer input shaft 3 in the radial direction ( Figure 2cIf the condition of shaking and deviation occurs in the X direction, the corresponding guiding effect will be lost; if the length l2 of the first flush portion 412 is too long, the machining accuracy of the diameter of the inner cavity 31 of the reducer input shaft 3, that is, the concentricity requirement will be too high.

[0081] It should be noted that the embodiment of the present application does not impose any specific limitation on the projection length l2 of the first flush portion 412 in the radial direction. For example, in other possible implementations, the projection length l2 of the first flush portion 412 in the radial direction may be 10 mm, 12.5 mm, 20 mm, etc.

[0082] In some possible implementations, reference Figure 2c and Figure 4 The motor rotor shaft 4 includes a second flush portion 414, a first chamfer 411, a first flush portion 412, a second chamfer 413 and a second flush portion 414 are sequentially connected, the second flush portion 414 is spaced apart from the cavity wall 311, and along the radial direction, a distance d6 from the second flush portion 414 to the cavity wall 311 is greater than a distance d5 from the first flush portion 412 to the cavity wall 311.

[0083] By adopting the above technical solution, after the first chamfer 411, the first flush portion 412 and the second chamfer 413 are assembled, the second flush portion 414 no longer needs to have a guide feature. Therefore, in order to reduce the machining accuracy of the diameter of the inner cavity 31 of the reducer input shaft 3, the distance d6 from the second flush portion 414 to the cavity wall 311 needs to be greater than the distance d5 from the first flush portion 412 to the cavity wall 311, thereby reserving space for the machining deviation of the diameter of the inner cavity 31 of the reducer input shaft 3.

[0084] In some possible implementations, reference Figures 2a to 4 , the oil inlet 21 is in the axial direction ( Figure 2b There is a first axial gap 431 between the hollow inner cavity 43 and the hollow inner cavity 43 in the Y direction. Figure 2b There is a first radial gap 432 between the hollow inner cavity 43 and the hollow inner cavity 43 in the X direction; along the axial direction ( Figure 3 In the middle Y direction), one end of the reducer input shaft 3 is provided with two first bearings 32, the first bearing 32 is interference fit with the reducer input shaft 3, the first bearing 32 is fitted with a small clearance with the housing 2, and there is a second axial clearance 321 between the first bearing 32 and the housing 2, and the distance of the second axial clearance 321 is 40μm to 60μm; the oil inlet hole 211, the first axial clearance 431, the first radial clearance 432 and the second axial clearance 321 define a first oil circuit 5, and the first oil circuit 5 is used to transport lubricating oil to the first bearing 32.

[0085] By adopting the above technical solution, in the first oil circuit 5, the lubricating oil enters the first axial gap 431 between the oil inlet member 21 and the hollow inner cavity 43 from the oil inlet member 21 of the outer casing 2 through the oil inlet hole 211, and then the oil flows into the first radial gap 432 between the oil inlet member 21 and the hollow inner cavity 43, and then enters the second axial gap 321 between the first bearing 32 and the outer casing 2, so as to transport the lubricating oil to the first bearing 32 to lubricate the first bearing 32.

[0086] The second axial gap 321 between the first bearing 32 and the housing 2 is 40 μm to 60 μm. If the second axial gap 321 is too small, the lubricating oil cannot lubricate the first bearing 32 through the second axial gap 321 . If the second axial gap 321 is too large, the first bearing 32 may loosen.

[0087] It should be noted that the embodiment of the present application does not impose any specific restrictions on the number of first bearings 32. For example, in other possible implementations, the number of first bearings 32 may be one, three, etc. The embodiment of the present application does not impose any specific restrictions on the distance of the second axial gap 321 between the first bearing 32 and the housing 2. For example, in other possible implementations, the distance of the second axial gap 321 may be 40 μm, 45.5 μm, 48 μm, 50 μm, 54.5 μm, 57 μm, 60 μm, etc.

[0088] In some possible implementations, reference Figure 3 , Figure 5 and Figure 6 The first part 41 includes a spline 415 and two first oil holes 416. The first part 41 and the cavity wall 311 of the reducer input shaft 3 are connected through the spline 415. The two first oil holes 416 are located between the spline 415 and the second end 3112. The two first oil holes 416 are connected to the hollow inner cavity 43. There is a third radial gap 4161 between the two first oil holes 416 and the first part 41; the hollow inner cavity 43, the first oil holes 416 and the third radial gap 4161 define a second oil circuit 6, and the second oil circuit 6 is used to transport lubricating oil to the spline 415.

[0089] By adopting the above technical solution, in the second oil circuit, the lubricating oil enters the third radial gap 4161 between the first oil hole 416 and the first part 41 from the hollow inner cavity 43 through the first oil hole 416, and then the oil flows into the connection between the cavity wall 311 of the reducer input shaft 3 and the spline 415 of the first part 41, thereby delivering the lubricating oil to the spline 415 to lubricate the spline 415 connection.

[0090] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of the first oil holes 416 . For example, in other possible implementations, the number of the first oil holes 416 may be three, four, etc.

[0091] In some possible implementations, reference Figure 3 , Figure 5 and Figure 6 The first part 41 includes a mating surface 417, which is located between the first oil hole 416 and the second end 3112. The mating surface 417 is provided with a plurality of oil guide grooves 4171, and the mating surface 417 is clearance-matched with the reducer input shaft 3; the hollow inner cavity 43, the first oil hole 416 and the plurality of oil guide grooves 4171 define a third oil circuit 7, and the third oil circuit 7 is used to transport lubricating oil to the mating surface 417.

[0092] By adopting the above technical solution, in the third oil circuit 7 , the lubricating oil enters the oil guide groove 4171 of the mating surface 417 of the first part 41 from the hollow inner cavity 43 through the first oil hole 416 , so as to transport the lubricating oil to the mating surface 417 for lubricating the mating surface 417 .

[0093] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of the oil guiding grooves 4171 . For example, in other possible implementations, the number of the oil guiding grooves 4171 may be three, four, etc.

[0094] In some possible implementations, reference Figure 1 , Figure 3 , Figure 5 and Figure 6 The other end of the reducer input shaft 3 is provided with two second bearings 33, and the second bearings 33 are connected to the reducer input shaft 3, along the radial direction ( Figure 5 The second bearing 33, the reducer input shaft 3 and the first part 41 are arranged in sequence, and there is a fourth axial gap 331 between the second bearing 33 and the motor rotor shaft 4; the hollow inner cavity 43, the first oil hole 416, the plurality of oil guide grooves 4171 and the fourth axial gap 331 define a fourth oil circuit 8, and the fourth oil circuit 8 is used to transport lubricating oil to the second bearing 33. The second oil circuit 6, the third oil circuit 7 and the fourth oil circuit 8 of the rotor oil circuit structure 1 are connected to each other.

[0095] By adopting the above technical solution, in the fourth oil circuit 8, the lubricating oil enters the oil guide groove 4171 of the mating surface 417 of the first part 41 from the hollow inner cavity 43 through the first oil hole 416, and then the oil flows into the fourth axial gap 331 between the second bearing 33 and the motor rotor shaft 4, thereby delivering the lubricating oil to the second bearing 33 to lubricate the second bearing 33.

[0096] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of the second bearings 33 . For example, in other possible implementations, the number of the second bearings 33 may be one, three, etc.

[0097] In some possible implementations, reference Figure 6 and Figure 7 The second part 42 includes four second oil holes 421, which are connected to the hollow inner cavity 43; the hollow inner cavity 43 and the four second oil holes 421 define a fifth oil circuit 9, which is used to transport lubricating oil to the motor rotor and windings (not shown in the figure).

[0098] By adopting the above technical solution, in the fifth oil circuit 9, the lubricating oil flows from the hollow inner cavity 43 into the motor rotor and windings via the second oil hole 421, thereby delivering the lubricating oil to the motor rotor and windings to lubricate and cool the motor rotor and windings.

[0099] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of the second oil holes 421 . For example, in other possible implementations, the number of the second oil holes 421 may be five, six, etc.

[0100] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A rotor oil circuit structure, characterized in that: The rotor oil circuit structure comprises: A reducer input shaft, comprising an inner cavity, the inner cavity comprising a cavity wall, the inner cavity passes through the reducer input shaft, and the cavity wall of the inner cavity comprises a first end and a second end; The motor rotor shaft comprises: A first part, wherein the first part is disposed in the inner cavity, and an end of the first part close to the first end comprises a first chamfer, a first flush portion, and a second chamfer connected in sequence, and the first chamfer, the first flush portion, and the second chamfer are respectively spaced apart from the cavity wall; a second part, the second part being close to the second end, the second part being used to be connected to the motor rotor, and the second part being integrally formed with the first part; a hollow inner cavity, wherein the hollow inner cavity passes through the first part and the second part; An oil inlet hole is located near the first end and is communicated with the hollow inner cavity.

2. The rotor oil circuit structure according to claim 1, characterized in that: The first chamfer includes a third end and a fourth end, the second chamfer includes a fifth end and a sixth end, along the radial direction, the distance from the third end to the cavity wall is greater than the distance from the fourth end to the cavity wall, the distance from the sixth end to the cavity wall is greater than the distance from the fifth end to the cavity wall, and the fourth end and the fifth end are respectively connected to the first flush portion.

3. The rotor oil circuit structure according to claim 1, characterized in that: A projection length of the first chamfer in the radial direction is greater than or equal to 5 mm.

4. The rotor oil circuit structure according to claim 1, characterized in that: The projection length of the first flush portion in the radial direction is 10 to 20 mm.

5. The rotor oil circuit structure according to claim 1, characterized in that: The motor rotor shaft includes a second flush portion, the first chamfer, the first flush portion, the second chamfer and the second flush portion are connected in sequence, the second flush portion is spaced apart from the cavity wall, and along the radial direction, the distance from the second flush portion to the cavity wall is greater than the distance from the first flush portion to the cavity wall.

6. The rotor oil circuit structure according to claim 1, characterized in that: The rotor oil circuit structure includes a shell, the shell includes an oil inlet, the oil inlet includes the oil inlet hole, the oil inlet is inserted into the hollow inner cavity of the first part, and there is a first axial gap between the oil inlet and the hollow inner cavity in the axial direction, and there is a first radial gap between the oil inlet and the hollow inner cavity in the radial direction; along the axial direction, a first bearing is provided at one end of the reducer input shaft, the first bearing is interference fit with the reducer input shaft, the first bearing is small clearance fit with the shell, and there is a second axial gap between the first bearing and the shell; the oil inlet hole, the first axial gap, the first radial gap and the second axial gap define a first oil circuit, and the first oil circuit is used to transport lubricating oil to the first bearing.

7. The rotor oil circuit structure according to claim 6, characterized in that: The second axial gap distance is 40 μm to 60 μm.

8. The rotor oil circuit structure according to claim 1, characterized in that: The first part includes a spline, the first part and the cavity wall of the reducer input shaft are connected by the spline, the first part includes a plurality of first oil holes, the plurality of first oil holes are located between the spline and the second end, the plurality of first oil holes are communicated with the hollow inner cavity, and a third radial gap exists between the plurality of first oil holes and the first part; The hollow inner cavity, the plurality of first oil holes and the third radial gap define a second oil passage, and the second oil passage is used to deliver lubricating oil to the spline.

9. The rotor oil circuit structure according to claim 8, characterized in that: The first part includes a mating surface, which is located between the first oil hole and the second end. The mating surface is provided with a plurality of oil guide grooves, and the mating surface is clearance-matched with the reducer input shaft; the hollow inner cavity, the plurality of first oil holes and the plurality of oil guide grooves define a third oil circuit, and the third oil circuit is used to transport lubricating oil to the mating surface.

10. The rotor oil circuit structure according to claim 9, characterized in that: Along the radial direction, a second bearing is provided at the other end of the reducer input shaft, and the second bearing is connected to the reducer input shaft. Along the radial direction, the second bearing, the reducer input shaft and the first part are arranged in sequence, and there is a fourth axial gap between the second bearing and the motor rotor shaft; the hollow inner cavity, the multiple first oil holes, the multiple oil guide grooves and the fourth axial gap define a fourth oil circuit, and the fourth oil circuit is used to transport lubricating oil to the second bearing.

11. The rotor oil circuit structure according to any one of claims 8 to 10, characterized in that: The second oil circuit, the third oil circuit and the fourth oil circuit of the rotor oil circuit structure are interconnected.

12. The rotor oil circuit structure according to claim 1, characterized in that: The second part includes a plurality of second oil holes, which are connected to the hollow inner cavity; the hollow inner cavity and the plurality of second oil holes define a fifth oil circuit, and the fifth oil circuit is used to transport lubricating oil to the motor rotor and windings.

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