Electrically driven lubrication system and vehicle

Abstract

The application provides an electrically-driven lubricating system and a vehicle, and relates to the technical field of vehicles.The electrically-driven lubricating system comprises a motor shaft, a blocking piece arranged at one end of the motor shaft, and a first bearing sleeved on the motor shaft.The motor shaft is hollow inside and forms a first cavity.The outer ring and the inner ring of the first bearing form a second cavity.The blocking piece is hollow inside and forms a third cavity.The first cavity and the third cavity are communicated.The blocking piece is provided with a first oil groove.The oil inlet end of the first oil groove is communicated with the first cavity.The oil outlet end of the first oil groove penetrates the circumferential outer wall of the blocking piece and is located at one end of the motor shaft and the first bearing in the axial direction, so that the lubricating oil in the third cavity can flow to one end of the first bearing in the axial direction through the first cavity and the first oil groove in sequence and flow into the second cavity.Thus, the cooling and lubricating effect of the support bearing of the motor shaft can be improved, and the heat balance lubrication demand of the vehicle under different complex working conditions can be met.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to an electric drive lubrication system and a vehicle. Background Technology

[0002] The electric drive system is the core power unit of an electric vehicle, and its main function is to convert electrical energy into mechanical energy to drive the vehicle. As a key component of the electric drive system, the normal, efficient and long-term operation of the transmission system depends heavily on the reliable operation of the lubrication system, especially high-speed shaft components such as the motor shaft and input shaft, as well as the bearings supporting the shaft system.

[0003] However, in current electric drive assemblies, the lubrication circuit of the transmission system is relatively complex and has design flaws, resulting in insufficient lubrication oil distributed to shafts and bearings with high speeds, which cannot meet the oil requirements of vehicles under complex operating conditions such as high speed, high temperature, and low temperature. Summary of the Invention

[0004] The problem this invention addresses is: how to improve the cooling and lubrication effect of the transmission system in an electric drive assembly.

[0005] To address the above problems, the present invention provides an electric drive lubrication system and a vehicle.

[0006] In a first aspect, the present invention provides an electrically driven lubrication system, including a motor shaft, a first bearing, and a sealing member. The sealing member is disposed at one end of the motor shaft, the first bearing is sleeved on the end of the motor shaft where the sealing member is disposed, the motor shaft is hollow inside and forms a first cavity, a second cavity is formed between the outer ring and the inner ring of the first bearing, the sealing member is hollow inside and forms a third cavity, and the first cavity communicates with the third cavity. The sealing component is provided with a first oil groove, the oil inlet end of the first oil groove is connected to the first cavity, and the oil outlet end of the first oil groove penetrates the circumferential outer wall of the sealing component and is located at one end of the motor shaft and the first bearing along the axial direction, so that the lubricating oil of the third cavity can flow sequentially through the first cavity and the first oil groove to one end of the axial direction of the first bearing, and flow from one end of the axial direction of the first bearing into the second cavity of the first bearing.

[0007] Optionally, the motor shaft is provided with a first oil hole at one end where the sealing member is located. One end of the first oil hole is connected to the first cavity, and the other end penetrates the circumferential outer wall of the motor shaft and is located at the other end of the first bearing along the axial direction, so that the lubricating oil of the first cavity can flow from the first oil hole to the other end of the first bearing along the axial direction, and flow into the second cavity from the other end of the first bearing along the axial direction.

[0008] Optionally, the circumferential outer wall of the motor shaft is provided with a second oil groove for collecting lubricating oil dripping from the motor stator. The second oil groove is located on the side of the first bearing away from the sealing member and communicates with the second cavity, so that after the lubricating oil dripping from the motor stator falls into the second oil groove, it can flow through the second oil groove to the other axial end of the first bearing and flow into the second cavity from the other axial end of the first bearing.

[0009] Optionally, the other end of the first oil hole is located inside the second oil groove.

[0010] Optionally, the second oil groove includes a straight groove section and a gradient groove section that are interconnected. The gradient groove section is located at the end of the straight groove section near the first bearing, and the cross-sectional area of ​​the gradient groove section increases along the direction from the end of the gradient groove section connected to the straight groove section to the end of the gradient groove section away from the straight groove section.

[0011] Optionally, the electric drive lubrication system further includes an input shaft, wherein the input shaft and the motor shaft are respectively provided with internal splines and external splines, and the input shaft and the motor shaft are connected by the internal splines and external splines; The circumferential outer wall of the portion of the motor shaft inserted into the input shaft is provided with a second oil hole and a spiral oil groove. The second oil hole and the spiral oil groove are located on the side of the external spline near the first bearing. The two ends of the second oil hole are respectively connected to the spiral oil groove and the first cavity, and the spiral oil groove extends to the external spline, so that the lubricating oil in the first cavity can flow from the second oil hole into the spiral oil groove, and flow through the spiral oil groove to the spline connection between the motor shaft and the input shaft.

[0012] Optionally, the circumferential outer wall of the portion of the motor shaft inserted into the input shaft is further provided with an annular oil groove. The annular oil groove is located between the spiral oil groove and the external spline and communicates with the spiral oil groove, so that the lubricating oil in the spiral oil groove can flow through the annular oil groove to the spline connection between the motor shaft and the input shaft.

[0013] Optionally, the electric drive lubrication system further includes a second bearing sleeved outside the input shaft. A fourth cavity is formed between the outer ring and the inner ring of the second bearing. A mating surface is provided at the end of the motor shaft away from the first bearing. The end face of the second bearing near the first bearing forms an axial abutment with the mating surface. A third oil groove is provided on the mating surface. The end face of the input shaft near the first bearing is spaced apart from the mating surface to form a fourth oil groove. The second oil hole, the fourth oil groove, the third oil groove, and the fourth cavity are sequentially connected, so that the lubricating oil in the first cavity can flow sequentially through the second oil hole, the fourth oil groove, and the third oil groove to the axial end of the second bearing, and flow from the axial end of the second bearing into the fourth cavity of the second bearing.

[0014] Optionally, the portion of the motor shaft inserted into the input shaft is divided into a first shaft segment and a second shaft segment. The external spline is provided in the second shaft segment, and the spiral oil groove is provided in the first shaft segment. The circumferential outer wall of the first shaft segment is a convex arc surface, and the first shaft segment abuts against the circumferential inner wall of the input shaft through the convex arc surface.

[0015] In a second aspect, the present invention provides a vehicle including the electric drive lubrication system described above.

[0016] The beneficial effects of the electric drive lubrication system of the present invention are: by setting a sealing member at, for example, the open end of the motor shaft (which is also the end of the motor shaft away from the input shaft), and setting a third cavity on the sealing member that communicates with the first cavity of the motor shaft, the lubricating oil flowing into the sealing member can flow into the first cavity of the motor shaft through the third cavity, so as to provide sufficient lubricating oil for cooling the high-speed motor shaft and ensure that the motor shaft can operate normally for a long time. Furthermore, by providing a first oil groove on the sealing component and connecting the first cavity of the motor shaft and the second cavity of the first bearing through the first oil groove, the lubricating oil flowing into the first cavity can flow to the first bearing through the first oil groove. Specifically, by having the oil outlet end of the first oil groove penetrate the circumferential outer wall of the sealing component and located at one end of the motor shaft and the first bearing along the axial direction, the lubricating oil can flow to one end of the first bearing along the axial direction and flow into the second cavity of the first bearing from one end of the first bearing along the axial direction. This allows the lubricating oil flowing into the motor shaft to be directly introduced from the first oil groove located on the side of the first bearing away from, for example, the motor rotor, between the outer and inner rings of the first bearing. On the one hand, this can efficiently cool and lubricate, for example, the rolling elements of the first bearing. On the other hand, it can prevent the lubricating oil from being directly thrown out to the motor rotor under high-speed operating conditions, resulting in a small amount of lubricating oil at the first bearing. Moreover, compared with the related technology that leads the lubricating oil between the inner ring of the bearing and the motor shaft to cool and lubricate the bearing, the present invention can not only improve the cooling and lubrication effect of the support bearing of the motor shaft (i.e., the first bearing), but also use the second cavity of the first bearing to accommodate more lubricating oil, so as to ensure that there is a sufficient amount of lubricating oil at the first bearing to meet the thermal balance lubrication requirements of the vehicle under different complex working conditions. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the electrically driven lubrication system in an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of a section at point A in the middle; Figure 3 for Figure 1 Enlarged view of a section at point B in the middle; Figure 4 This is a schematic diagram of the structure of the electrically driven lubrication system in an embodiment of the present invention; Figure 5 This is a schematic diagram of the sealing component in an embodiment of the present invention; Figure 6 This is a schematic diagram of the motor shaft structure in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure in which the outer circumferential wall of the first shaft segment of the motor shaft and the inner circumferential wall of the input shaft cooperate in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Motor shaft; 11. First cavity; 12. First oil hole; 13. Second oil groove; 131. Straight groove section; 132. Gradient groove section; 14. Second oil hole; 15. Spiral oil groove; 16. Annular oil groove; 17. Mating surface; 171. Third oil groove; 18. First shaft section; 19. Second shaft section; 2. First bearing; 21. Second cavity; 3. Sealing component; 31. Third cavity; 32. First oil groove; 321. First groove section; 322. Second groove section; 33. Third oil hole; 34. Insertion part; 35. Boss part; 4. Input shaft; 5. Second bearing; 51. Fourth cavity; 6. Fourth oil groove; 7. Outer convex arc surface; 8. Waveform gasket; 91. Motor stator; 92. Motor rotor. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention 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 the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] 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 invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] In related technologies, the lubrication circuit of the transmission system in the electric drive assembly is relatively complex and has design flaws, resulting in insufficient lubrication oil distributed to shafts and bearings with high speeds, which cannot meet the oil demand of the vehicle under complex operating conditions such as high speed, high temperature, and low temperature.

[0023] To address the problems existing in the aforementioned related technologies, embodiments of the present invention provide an electric drive lubrication system and a vehicle.

[0024] Combination Figure 1 , Figure 2 and Figure 5 As shown, an electric drive lubrication system according to an embodiment of the present invention includes a motor shaft 1, a first bearing 2, and a sealing member 3. The sealing member 3 is disposed at one end of the motor shaft 1, and the first bearing 2 is sleeved on the end of the motor shaft 1 where the sealing member 3 is disposed. The motor shaft 1 is hollow and forms a first cavity 11. A second cavity 21 is formed between the outer ring and the inner ring of the first bearing 2. The sealing member 3 is hollow and forms a third cavity 31. The first cavity 11 and the third cavity 31 are connected. The sealing component 3 is provided with a first oil groove 32. The oil inlet end of the first oil groove 32 is connected to the first cavity 11, and the oil outlet end of the first oil groove 32 penetrates the circumferential outer wall of the sealing component 3 and is located at one end of the motor shaft 1 and the first bearing 2 along the axial direction, so that the lubricating oil of the third cavity 31 can flow sequentially through the first cavity 11 and the first oil groove 32 to one end of the axial direction of the first bearing 2, and flow from one end of the axial direction of the first bearing 2 into the second cavity 21 of the first bearing 2.

[0025] It should be noted that, Figure 2 The red arrows indicate the flow path of the lubricating oil to the first bearing 2. Due to the complex operating conditions of the electric drive system, the flow path of the lubricating oil may differ under different operating conditions. For example, under high-speed operating conditions, the lubricating oil flow path to the first bearing 2 may be: third cavity 31 → first cavity 11 → first oil groove 32 → second cavity 21; that is, the lubricating oil flowing into the sealing member 3 flows through the third cavity 31 into the first cavity 11 of the motor shaft 1, and then flows through the first oil groove 32 to the side of the first bearing 2 closest to the sealing member 3, and then flows into the second cavity 21 of the first bearing 2 for cooling and lubrication. Under low-speed operating conditions, the lubricating oil flow path to the first bearing 2 may be: motor stator 91 → second oil groove 13 → second cavity 21 of the first bearing 2; that is, the lubricating oil dripping from the motor stator 91 flows through the second oil groove 13 to the side of the first bearing 2 away from the sealing member 3, and then enters the second cavity 21 of the first bearing 2 for cooling and lubrication. Under medium-to-high speed operating conditions, the lubricating oil flowing to the first bearing 2 can be divided into two paths: one is: third cavity 31 → first cavity 11 → first oil groove 32 → second cavity 21; the other is: motor stator 91 → second oil groove 13 → second cavity 21 of the first bearing 2. Under ultra-high speed operating conditions, the lubricating oil flowing to the first bearing 2 can be: third cavity 31 → first cavity 11 → first oil hole 12 → second cavity 21; that is, the lubricating oil flowing into the sealing component 3 flows into the first cavity 11 of the motor shaft 1 through the third cavity 31, and flows to the side of the first bearing 2 near the sealing component 3 through the first oil hole 12, and then flows into the second cavity 21 of the first bearing 2 for cooling and lubrication.

[0026] Specifically, the motor shaft 1 is a hollow shaft structure, and its end away from the input shaft 4 is usually open. The internal space of the motor shaft 1 forms a first cavity 11. The sealing member 3 is installed at the open end of the motor shaft 1 by means of, for example, plug-in connection, and seals the open end to prevent the lubricating oil inside the motor shaft 1 from leaking from the open end. The first bearing 2 is a support bearing for the motor shaft 1 and is sleeved on the open end of the motor shaft 1. The bearing mainly includes an outer ring, an inner ring, rolling elements, and a cage. A cavity is formed between the outer ring and the inner ring due to the gap. The cage confines the rolling elements in the cavity between the outer ring and the inner ring. The sealing member 3 is also a hollow structure, and its internal space forms a third cavity 31, which communicates with the first cavity 11. Alternatively, lubricating oil can flow into the sealing member 3 from one axial end. In this case, the end of the sealing member 3 away from the motor shaft 1 has an opening communicating with the third cavity 31, and the lubricating oil flows into the third cavity 31 of the sealing member 3 from this opening, and then into the first cavity 11 of the motor shaft 1. Lubricating oil can also flow into the sealing member 3 from its circumferential outer wall. In this case, the circumferential outer wall of the sealing member 3 has a third oil hole 33 communicating with the third cavity 31. Figure 5 As shown, lubricating oil flows from the third oil hole 33 into the third cavity 31 of the sealing member 3, and then into the first cavity 11 of the motor shaft 1. Furthermore, the sealing member 3 is provided with a first oil groove 32, which can be located at the point where the sealing member 3 connects to the motor shaft 1. The oil inlet end of the first oil groove 32 communicates with the first cavity 11, and the oil outlet end of the first oil groove 32 penetrates the circumferential outer wall of the sealing member 3 and is located at one end of the motor shaft 1 and the first bearing 2 along the axial direction. For example... Figure 2 As shown, the oil outlet of the first oil groove 32 is located at the left end of the motor shaft 1 and the first bearing 2, which is also the end of the first bearing 2 away from the motor stator 91 and the motor rotor 92. The oil outlet of the first oil groove 32 is connected to the second cavity 21 of the first bearing 2 through the left side space of the first bearing 2.

[0027] In this embodiment, a sealing member 3 can be provided at, for example, the open end of the motor shaft 1 (which is also the end of the motor shaft 1 away from the input shaft 4), and a third cavity 31 communicating with the first cavity 11 of the motor shaft 1 can be provided on the sealing member 3. This allows the lubricating oil flowing into the sealing member 3 to flow into the first cavity 11 of the motor shaft 1 through the third cavity 31, so as to provide sufficient lubricating oil for cooling the high-speed motor shaft 1 and ensure that the motor shaft 1 can operate normally for a long time. Furthermore, by providing a first oil groove 32 on the sealing member 3 and connecting the first cavity 11 of the motor shaft 1 and the second cavity 21 of the first bearing 2 through the first oil groove 32, the lubricating oil flowing into the first cavity 11 can flow to the first bearing 2 through the first oil groove 32. Specifically, by having the oil outlet end of the first oil groove 32 penetrate the circumferential outer wall of the sealing member 3 and be located at one end of the motor shaft 1 and the first bearing 2 along the axial direction, the lubricating oil can flow to one end of the first bearing 2 along the axial direction through the first oil groove 32 and flow into the second cavity 21 of the first bearing 2 from one end of the first bearing 2 along the axial direction. This allows the lubricating oil flowing into the motor shaft 1 to be directly introduced from the first oil groove 32, located on the side of the first bearing 2 away from, for example, the motor rotor 92, between the outer and inner rings of the first bearing 2. On the one hand, this can efficiently cool and lubricate, for example, the rolling elements of the first bearing 2. On the other hand, it can prevent the lubricating oil from being directly thrown out to the motor rotor 92 under high-speed operating conditions, which would result in a small amount of lubricating oil at the first bearing 2. Moreover, compared with the related technology of leading the lubricating oil between the inner ring of the bearing and the motor shaft to cool and lubricate the bearing, this embodiment can not only improve the cooling and lubrication effect of the support bearing (i.e. the first bearing 2) of the motor shaft 1, but also use the second cavity 21 of the first bearing 2 to accommodate more lubricating oil, so as to ensure that there is a sufficient amount of lubricating oil at the first bearing 2 to meet the thermal balance lubrication requirements of the vehicle under different complex working conditions.

[0028] Furthermore, since the first bearing 2 is usually provided with a corrugated gasket 8 for axial positioning of the first bearing 2 near the sealing member 3, and the oil outlet of the first oil groove 32 corresponds to the position of the corrugated gasket 8, the lubricating oil can also cool the corrugated gasket 8 when flowing from the first oil groove 32 to the first bearing 2. Moreover, the cooling and lubrication effect of the first bearing 2 can be further improved by providing multiple first oil grooves 32 along the circumference on the sealing member 3.

[0029] Furthermore, combining 2 and Figure 5As shown, the sealing member 3 includes an insertion part 34 and a boss part 35. The insertion part 34 is inserted into the first cavity 11 of the motor shaft 1, and the boss part 35 forms an axial abutment with the first bearing 2. The insertion part 34 is generally a hollow cylindrical structure, and the boss part 35 is generally a ring-shaped structure fitted onto the insertion part 34. During assembly, the sealing member 3 is fixed to the motor shaft 1 by inserting the insertion part 34 of the sealing member 3 into the first cavity 11 of the motor shaft 1 from the open end, and the axial end face of the boss part 35 abuts against the axial end face of the first bearing 2, thus achieving the connection between the sealing member 3, the motor shaft 1, and the first bearing 2.

[0030] Furthermore, combined Figure 5 As shown, the first oil groove 32 includes a first groove segment 321 and a second groove segment 322 that are interconnected. The first groove segment 321 is disposed on the circumferential outer wall of the insertion part 34, and the second groove segment 322 is disposed on the side of the boss part 35 near the first bearing 2. This facilitates the machining of the first oil groove 32 by grooving the outer surfaces of the insertion part 34 and the boss part 35 of the sealing member 3, thereby improving the convenience of machining the first oil groove 32.

[0031] Optionally, combined Figure 1 , Figure 2 and Figure 6 As shown, the motor shaft 1 is provided with a first oil hole 12 at one end of the sealing member 3. One end of the first oil hole 12 is connected to the first cavity 11, and the other end passes through the circumferential outer wall of the motor shaft 1 and is located at the other end of the first bearing 2 along the axial direction. The first oil hole 12 is connected to the second cavity 21, so that the lubricating oil of the first cavity 11 can flow from the first oil hole 12 to the other end of the first bearing 2 along the axial direction, and flow into the second cavity 21 from the other end of the first bearing 2 along the axial direction.

[0032] In this optional embodiment, the first oil hole 12 is disposed on the circumferential outer wall of the motor shaft 1 and communicates with the internal space of the motor shaft 1 (i.e., the first cavity 11). The first oil hole 12 can be disposed radially along the motor shaft 1 or inclined relative to the radial direction of the motor shaft 1; no specific limitation is made here. Furthermore, the oil outlet end of the first oil hole 12 is located on the side of the first bearing 2 away from the sealing member 3. That is, the oil outlet ends of the first oil groove 32 and the first oil hole 12 are respectively located at the axial ends of the first bearing 2. This allows the lubricating oil flowing into the motor shaft 1 to be divided into two paths: one path flows through the first oil groove 32 to one axial end of the first bearing 2 and into the second cavity 21 of the first bearing 2; the other path flows through the first oil hole 12 to the other axial end of the first bearing 2 and into the second cavity 21 of the first bearing 2. This allows lubricating oil to flow from both axial ends of the first bearing 2 into the second cavity 21 of the first bearing 2, further increasing the amount of lubricating oil supplied to the first bearing 2 and improving the cooling and lubrication effect at the support bearing of the motor shaft 1.

[0033] Optionally, combined Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, a second oil groove 13 is provided on the circumferential outer wall of the motor shaft 1. The second oil groove 13 is used to collect the lubricating oil dripping from the motor stator 91. The second oil groove 13 is located on the side of the first bearing 2 away from the sealing member 3 and is connected to the second cavity 21. This allows the lubricating oil dripping from the motor stator 91 to flow through the second oil groove 13 to the other axial end of the first bearing 2 and then into the second cavity 21 from the other axial end of the first bearing 2.

[0034] In this optional embodiment, the second oil groove 13 can extend along the axial direction of the motor shaft 1 or be inclined relative to the axial direction of the motor shaft 1. Furthermore, the motor stator 91 is located between the two ends of the second oil groove 13 along the axial direction of the motor shaft 1, allowing the second oil groove 13 to collect lubricating oil dripping from either end of the motor stator 91. Thus, by providing the second oil groove 13 on the circumferential outer wall of the motor shaft 1 to collect lubricating oil dripping from the motor stator 91 during low-speed motor operation, the lubricating oil dripping from the motor stator 91 can flow through the second oil groove 13 to the end of the first bearing 2 away from the sealing member 3 and into the second cavity 21 for further cooling and lubrication of the first bearing 2. This not only increases the lubricating oil path to the first bearing 2 but also facilitates the recycling of the lubricating oil.

[0035] Furthermore, combined Figure 6As shown, the second oil groove 13 extends along the axial direction of the motor shaft 1. Compared with setting the second oil groove 13 at an angle relative to the axial direction of the motor shaft 1, this not only makes it easier to process the second oil groove 13, but also shortens the oil passage path of the second oil groove 13, so that the lubricating oil can flow into the second cavity 21 of the first bearing 2 more quickly, thereby further improving the lubrication effect.

[0036] Optionally, combined Figure 6 As shown, the other end of the first oil hole 12 is located within the second oil groove 13. The other end of the first oil hole 12 refers to the end located on the circumferential outer wall of the motor shaft 1, which is also the oil outlet end of the first oil hole 12. Correspondingly, the other end of the first oil hole 12 refers to the end located inside the motor shaft 1, which is not only the end communicating with the first cavity 11, but also the oil inlet end of the first oil hole 12. In this optional embodiment, by placing the other end of the first oil hole 12 within the second oil groove 13, the lubricating oil flowing through the first oil hole 12 to the first bearing 2 can flow into the second cavity 21 of the first bearing 2 under the guidance of the second oil groove 13, ensuring that the lubricating oil can accurately flow into the second cavity 21 of the first bearing 2 for cooling and lubrication.

[0037] Optionally, combined Figure 6 As shown, the second oil groove 13 includes a straight groove section 131 and a gradient groove section 132 that are interconnected. The straight groove section 131 is used to correspond to the motor stator 91. The gradient groove section 132 is located at the end of the straight groove section 131 near the first bearing 2, and the cross-sectional area of ​​the gradient groove section 132 increases along the direction from the end of the gradient groove section 132 connected to the straight groove section 131 to the end of the gradient groove section 132 away from the straight groove section 131.

[0038] It should be noted that the cross-section of the second oil groove 13 refers to the cross-section of the second oil groove 13 on the plane perpendicular to the axial direction of the motor shaft 1, and correspondingly, the cross-section of the gradient groove segment 132 refers to the cross-section of the gradient groove segment 132 on the plane perpendicular to the axial direction of the motor shaft 1.

[0039] In this optional embodiment, the motor stator 91 is located between the two ends of the straight groove section 131 along the axial direction of the motor shaft 1, so as to use the straight groove section 131 to catch the lubricating oil dripping from the motor stator 91. A gradient groove section 132 is provided at the end of the straight groove section 131 near the first bearing 2, and the cross-sectional area of ​​the gradient groove section 132 increases from the end where it connects to the straight groove section 131 to the end away from the straight groove section 131. That is, the gradient groove section 132 is approximately a trapezoidal groove structure with a large opening and a small opening, and the large opening of the trapezoidal groove structure is close to the first bearing 2. This increases the communication area between the second oil groove 13 and the second cavity 21 while achieving a guiding function, facilitating the flow of more lubricating oil into the second cavity 21 of the first bearing 2 for cooling and lubrication.

[0040] In other embodiments, the straight groove section 131 of the second oil groove 13 can be used as a positioning groove for the motor rotor 92. In this case, lubricating oil dripping from the side of the motor stator 91 near the first bearing 2 can flow into the gradient groove section 132 and into the second cavity 21 of the first bearing 2, while lubricating oil dripping from the side of the motor stator 91 away from the first bearing 2 can flow into the straight groove section 131 to cool and lubricate the motor rotor. Alternatively, when the straight groove section 131 is used as an oil groove instead of a positioning groove for the motor rotor 92, an additional positioning groove needs to be provided on the circumferential outer wall of the motor shaft 1 to position and install the motor rotor 92.

[0041] Optionally, combined Figure 1 , Figure 3 and Figure 6 As shown, the electric drive lubrication system also includes an input shaft 4. The input shaft 4 and the motor shaft 1 are respectively provided with internal splines and external splines. The input shaft 4 and the motor shaft 1 are connected by internal splines and external splines. The circumferential outer wall of the part of the motor shaft 1 that is inserted into the input shaft 4 is provided with a second oil hole 14 and a spiral oil groove 15. The second oil hole 14 and the spiral oil groove 15 are located on the side of the external spline near the first bearing 2. The two ends of the second oil hole 14 are respectively connected to the spiral oil groove 15 and the first cavity 11, and the spiral oil groove 15 extends to the external spline, so that the lubricating oil of the first cavity 11 can flow from the second oil hole 14 into the spiral oil groove 15, and flow through the spiral oil groove 15 to the spline connection between the motor shaft 1 and the input shaft 4.

[0042] It should be noted that, Figure 3 The red arrows in the diagram indicate the flow path of the lubricating oil to the spline connection between the motor shaft 1 and the input shaft 4, as well as to the second bearing 5.

[0043] In this embodiment, the lubricating oil flowing into the motor shaft 1 can be guided through the second oil hole 14 and the spiral oil groove 15 to the spline connection between the motor shaft 1 and the input shaft 4 for cooling and lubrication. Moreover, using the spiral oil groove 15 to transport the lubricating oil can accelerate the flow of lubricating oil and enhance the lubrication effect, making it easier to meet the lubrication requirements under high-speed motor rotation. In addition, when the spiral oil groove 15 rotates in the opposite direction to the rotation direction of the motor shaft 1 when the vehicle moves forward, the lubricating oil can be quickly delivered to the spline connection between the motor shaft 1 and the input shaft 4 by utilizing the chip-removing effect generated by the rotation of the motor shaft 1, similar to that of a drill bit, to further enhance the lubrication effect.

[0044] Furthermore, combined Figure 6 As shown, the second oil hole 14 is connected to the end of the spiral oil groove 15 away from the external spline. Compared with connecting the second oil hole 14 to the middle position of the spiral oil groove 15, this not only shortens the machining length of the spiral oil groove 15, but also ensures that the lubricating oil flowing out of the second oil hole 14 can flow along the spiral oil groove 15 to the spline connection between the motor shaft 1 and the input shaft 4, avoiding the lubricating oil from remaining in the spiral oil groove 15 without participating in the cooling and lubrication function, thereby saving the amount of lubricating oil while ensuring the lubrication effect.

[0045] Optionally, combined Figure 3 and Figure 6 As shown, the circumferential outer wall of the portion of the motor shaft 1 that inserts into the input shaft 4 is also provided with an annular oil groove 16. The annular oil groove 16 is located between the spiral oil groove 15 and the external spline, and communicates with the spiral oil groove 15, so that the lubricating oil in the spiral oil groove 15 can flow through the annular oil groove 16 to the spline connection between the motor shaft 1 and the input shaft 4. In this way, the annular oil groove 16 can hold more lubricating oil, thereby increasing the amount of lubricating oil supplied to the spline connection between the motor shaft 1 and the input shaft 4, and improving the cooling and lubrication effect of the spline connection of the shaft system components.

[0046] Optionally, combined Figure 3 and Figure 6 As shown, the electric drive lubrication system also includes a second bearing 5 sleeved outside the input shaft 4. A fourth cavity 51 is formed between the outer ring and the inner ring of the second bearing 5. A mating surface 17 is provided at the end of the motor shaft 1 away from the first bearing 2. The end face of the second bearing 5 near the first bearing 2 forms an axial abutment with the mating surface 17. A third oil groove 171 is provided on the mating surface 17. The end face of the input shaft 4 near the second bearing 5 is spaced apart from the mating surface 17 to form a fourth oil groove 6. The second oil hole 14, the fourth oil groove 6, the third oil groove 171 and the fourth cavity 51 are connected in sequence, so that the lubricating oil in the first cavity 11 can flow sequentially through the second oil hole 14, the fourth oil groove 6 and the third oil groove 171 to the axial end of the second bearing 5, and flow from the axial end of the second bearing 5 into the fourth cavity 51 of the second bearing 5.

[0047] In this optional embodiment, the second bearing 5 serves as a support bearing at the spline connection between the motor shaft 1 and the input shaft 4, and is sleeved on the outside of the input shaft 4. Furthermore, the end face of the second bearing 5 near the first bearing 2 axially abuts against the mating surface 17 of the motor shaft 1. A third oil groove 171 is provided on the mating surface 17, and the third oil groove 171 communicates with the fourth cavity 51 of the second bearing 5 through the space on the side of the second bearing 5 near the first bearing 2. There is a gap between the end face of the input shaft 4 near the second bearing 5 and the mating surface 17, which forms the fourth oil groove 6. The second oil hole 14, the fourth oil groove 6, the third oil groove 171, and the fourth cavity 51 are sequentially connected.

[0048] In this way, the lubricating oil in the motor shaft 1 can be divided into two branches at the second oil hole 14. One branch flows through the spiral oil groove 15 and the annular oil groove 16 to the spline connection between the motor shaft 1 and the input shaft 4 for cooling and lubrication. The other branch flows through the fourth oil groove 6 and the third oil groove 171 to the end of the second bearing 5 near the first bearing 2, and flows into the fourth cavity 51 of the second bearing 5. Thus, the lubricating oil flowing into the motor shaft 1 is directly introduced from the third oil groove 171 located on the side of the second bearing 5 near the first bearing 2 into the space between the outer and inner rings of the second bearing 5, so as to efficiently cool and lubricate, for example, the rolling elements of the second bearing 5. This not only improves the cooling and lubrication effect at the second bearing 5, but also allows the fourth cavity 51 of the second bearing 5 to hold more lubricating oil, so as to ensure that there is a sufficient amount of lubricating oil at the second bearing 5 to meet the thermal balance lubrication requirements of the vehicle under different complex working conditions.

[0049] Optionally, combined Figure 3 , Figure 6 and Figure 7 As shown, the part of the motor shaft 1 inserted into the input shaft 4 is divided into a first shaft section 18 and a second shaft section 19. An external spline is provided on the second shaft section 19, and a spiral oil groove 15 is provided on the first shaft section 18. The circumferential outer wall of the first shaft section 18 is an outwardly convex arc surface 7. The first shaft section 18 abuts against the circumferential inner wall of the input shaft 4 through the outwardly convex arc surface 7.

[0050] In this optional embodiment, a first shaft segment 18 is provided to provide a portion for machining the spiral oil groove 15, and a second shaft segment 19 is provided to provide a portion for machining the external spline. Furthermore, using the plane passing through the central axis of the first shaft segment 18 as a reference plane (i.e., the central axis of the first shaft segment 18 lies on the reference plane), the circumferential outer wall of the first shaft segment 18 being a convex arc surface 7 can be understood as the intersection line formed by the circumferential outer wall of the first shaft segment 18 and the reference plane being a convex arc line, rather than a straight line. Thus, by setting the circumferential outer wall of the first shaft segment 18 as a convex arc surface 7, the surface-to-surface contact between the motor shaft 1 and the input shaft 4 at the first shaft segment 18 is changed to a line-to-surface contact. This reduces the contact area between the motor shaft 1 and the input shaft 4, reduces performance degradation at the connection point due to heat, and improves the service life of the motor shaft 1 and the input shaft 4.

[0051] An embodiment of the present invention provides a vehicle including the electric drive lubrication system described above.

[0052] The beneficial effects of the vehicle in this embodiment are the same as those of the electric drive lubrication system described above, and will not be repeated here.

[0053] While the present invention has been disclosed above, its scope of protection 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 scope of protection of the present invention.

Claims

1. An electrically driven lubrication system, characterized in that, The device includes a motor shaft (1), a first bearing (2), and a sealing member (3). The sealing member (3) is located at one end of the motor shaft (1). The first bearing (2) is sleeved on the end of the motor shaft (1) where the sealing member (3) is located. The motor shaft (1) is hollow inside and forms a first cavity (11). A second cavity (21) is formed between the outer ring and the inner ring of the first bearing (2). The sealing member (3) is hollow inside and forms a third cavity (31). The first cavity (11) and the third cavity (31) are connected. The sealing member (3) is provided with a first oil groove (32), the oil inlet end of the first oil groove (32) is connected to the first cavity (11), and the oil outlet end of the first oil groove (32) penetrates the circumferential outer wall of the sealing member (3) and is located at one end of the motor shaft (1) and the first bearing (2) along the axial direction, so that the lubricating oil of the third cavity (31) can flow sequentially through the first cavity (11) and the first oil groove (32) to one end of the axial direction of the first bearing (2), and flow from one end of the axial direction of the first bearing (2) into the second cavity (21) of the first bearing (2); The motor shaft (1) is provided with a first oil hole (12) at one end of the sealing member (3). One end of the first oil hole (12) is connected to the first cavity (11), and the other end passes through the circumferential outer wall of the motor shaft (1) and is located at the other end of the first bearing (2) along the axial direction, so that the lubricating oil of the first cavity (11) can flow from the first oil hole (12) to the other end of the first bearing (2) along the axial direction, and flow into the second cavity (21) from the other end of the first bearing (2) along the axial direction. The circumferential outer wall of the motor shaft (1) is provided with a second oil groove (13). The second oil groove (13) is used to collect the lubricating oil dripping from the motor stator (91). The second oil groove (13) is located on the side of the first bearing (2) away from the sealing member (3) and communicates with the second cavity (21). This allows the lubricating oil dripping from the motor stator (91) to flow through the second oil groove (13) to the other axial end of the first bearing (2) and then flow into the second cavity (21) from the other axial end of the first bearing (2).

2. The electric drive lubrication system according to claim 1, characterized in that, The other end of the first oil hole (12) is located in the second oil groove (13).

3. The electrically driven lubrication system according to claim 1, characterized in that, The second oil groove (13) includes a straight groove section (131) and a gradient groove section (132) that are interconnected. The gradient groove section (132) is located at one end of the straight groove section (131) near the first bearing (2), and the cross-sectional area of ​​the gradient groove section (132) increases along the direction from one end of the gradient groove section (132) connected to the straight groove section (131) to one end of the gradient groove section (132) away from the straight groove section (131).

4. The electrically driven lubrication system according to claim 1, characterized in that, It also includes an input shaft (4), the input shaft (4) and the motor shaft (1) are respectively provided with an internal spline and an external spline, and the input shaft (4) and the motor shaft (1) are connected by the internal spline and the external spline; The circumferential outer wall of the part of the motor shaft (1) that is inserted into the input shaft (4) is provided with a second oil hole (14) and a spiral oil groove (15). The second oil hole (14) and the spiral oil groove (15) are located on the side of the external spline close to the first bearing (2). The two ends of the second oil hole (14) are respectively connected to the spiral oil groove (15) and the first cavity (11), and the spiral oil groove (15) extends to the external spline, so that the lubricating oil in the first cavity (11) can flow from the second oil hole (14) into the spiral oil groove (15) and flow through the spiral oil groove (15) to the spline connection between the motor shaft (1) and the input shaft (4).

5. The electrically driven lubrication system according to claim 4, characterized in that, The circumferential outer wall of the part of the motor shaft (1) that is inserted into the input shaft (4) is also provided with an annular oil groove (16). The annular oil groove (16) is located between the spiral oil groove (15) and the external spline and is connected to the spiral oil groove (15), so that the lubricating oil in the spiral oil groove (15) can flow through the annular oil groove (16) to the spline connection between the motor shaft (1) and the input shaft (4).

6. The electrically driven lubrication system according to claim 4, characterized in that, It also includes a second bearing (5) sleeved outside the input shaft (4), with a fourth cavity (51) formed between the outer and inner rings of the second bearing (5). The end of the motor shaft (1) away from the first bearing (2) is provided with a mating surface (17). The end face of the second bearing (5) near the first bearing (2) forms an axial contact with the mating surface (17). The mating surface (17) is provided with a third oil groove (171). The end face of the input shaft (4) near the first bearing (2) is axially contacted with the mating surface (17). The mating surface (17) is spaced apart and forms a fourth oil groove (6), and the second oil hole (14), the fourth oil groove (6), the third oil groove (171) and the fourth cavity (51) are connected in sequence, so that the lubricating oil in the first cavity (11) can flow to one axial end of the second bearing (5) in sequence through the second oil hole (14), the fourth oil groove (6) and the third oil groove (171), and flow into the fourth cavity (51) of the second bearing (5) from one axial end of the second bearing (5).

7. The electrically driven lubrication system according to claim 4, characterized in that, The portion of the motor shaft (1) inserted into the input shaft (4) is divided into a first shaft segment (18) and a second shaft segment (19). The external spline is provided in the second shaft segment (19), and the spiral oil groove (15) is provided in the first shaft segment (18). The circumferential outer wall of the first shaft segment (18) is an outwardly convex arc surface (7). The first shaft segment (18) abuts against the circumferential inner wall of the input shaft (4) through the outwardly convex arc surface (7).

8. A vehicle, characterized in that, Includes the electrically driven lubrication system as described in any one of claims 1 to 7.

Images