Electric drive system and vehicle

Abstract

The utility model provides an electric drive system and a vehicle, and relates to the technical field of electric drive. The electric drive system comprises a shell, a motor assembly and a speed reducer assembly. The shell is provided with a containing cavity, and the motor assembly and the speed reducer assembly are both arranged in the containing cavity. The speed reducer assembly comprises a center wheel and a planet wheel; the output end of the motor assembly is in butt joint with the planet wheel, the planet wheel is meshed with the center wheel, and the planet wheel comprises a gear shaft, a gear part and a first bearing; the gear shaft is sleeved with the gear part, and the first bearing is arranged in a gap between the gear shaft and the gear part; the gear shaft is provided with an oil guide groove, and the oil guide groove communicates with the containing cavity and the gap, so that lubricating oil in the containing cavity can be guided into the gap between the gear shaft and the gear part through the oil guide groove, then the lubricating oil can enter the first bearing, the lubricating effect of the first bearing is improved, and abrasion of the first bearing is reduced; the service life of the speed reducer assembly and the reliability of the electric drive system are improved.

Description

Technical Field

[0001] The present application relates to the field of electric drive technology, and in particular to an electric drive system and a vehicle. Background Art

[0002] With the rapid popularization of new energy vehicles, electric drive systems are rapidly developing towards high power density, low cost, high integration, and high efficiency. Under this trend, high power density requires high power and compact size of the motor.

[0003] In related technologies, the electric drive system of new energy vehicles generally integrates a motor and a reducer. The motor's output shaft cooperates with the reducer, reducing the speed of the motor's output shaft and outputting power. The reducer includes multiple gears that mesh sequentially to transmit power. The gears are supported by a gear shaft, with needle bearings interposed between the shaft and the gears.

[0004] However, the lubrication effect of the needle roller bearings on the gear shaft of the reducer in the current electric drive system is poor and they are prone to wear. Utility Model Content

[0005] The present application provides an electric drive system and a vehicle to solve the technical problem that the needle roller bearings on the gear shaft of the reducer in the current electric drive system have poor lubrication effect and are prone to wear.

[0006] In a first aspect, the present application provides an electric drive system, which includes a housing, a motor assembly and a reducer assembly; the housing has a accommodating cavity, and the motor assembly and the reducer assembly are both arranged in the accommodating cavity; the reducer assembly includes a center wheel and a planetary wheel; the output end of the motor assembly is connected to the planetary wheel, and the planetary wheel is engaged with the center wheel.

[0007] Among them, the planetary gear includes a gear shaft, a gear part and a first bearing; the gear part is sleeved on the gear shaft, and the first bearing is arranged in the gap between the gear shaft and the gear part; the gear shaft is provided with an oil guide groove, which connects the accommodating cavity and the gap.

[0008] The electric drive system provided in the embodiment of the present application provides an oil guide groove on the gear shaft of the reducer assembly, so that the lubricating oil in the accommodating cavity can be guided to the gap between the gear shaft and the gear part through the oil guide groove, thereby allowing the lubricating oil to enter the first bearing, thereby improving the lubrication effect of the first bearing, reducing the wear of the first bearing, and increasing the service life of the reducer assembly and the reliability of the electric drive system.

[0009] As an optional implementation, the opening of the oil guide groove is located at the axial end of the gear shaft; and the oil guide groove extends along the axial direction of the gear shaft.

[0010] Such an arrangement can guide the lubricating oil to flow along the axial direction of the gear shaft, thereby improving the smoothness of the flow of the lubricating oil.

[0011] As an optional implementation, the length of the oil guide groove is smaller than the axial length of the gear shaft.

[0012] With this arrangement, the lubricating oil can be introduced into the middle position of the gear, thereby improving the lubrication effect of the first bearing near the middle position of the gear shaft.

[0013] As an optional embodiment, the oil guide groove is provided with a first opening and a second opening; the first opening is located at one end of the oil guide groove close to the end of the gear shaft and is connected to the accommodating cavity; the second opening is located at one end of the oil guide groove away from the end of the gear shaft and is opposite to the first bearing; the second opening is connected to the gap.

[0014] With this arrangement, lubricating oil can be introduced from the first opening and led out to the first bearing through the second opening, thereby ensuring a good lubrication effect.

[0015] As an optional implementation, the first opening is arranged along the radial direction of the gear shaft; and / or the second opening is arranged along the radial direction of the gear shaft.

[0016] With such an arrangement, after the lubricating oil enters the oil guide groove, it can be ensured that the lubricating oil flows along the oil guide groove, thereby preventing the lubricating oil from flowing back.

[0017] As an optional embodiment, limit baffles are respectively provided at both ends of the gear part; one end of the gear shaft has a protrusion, which extends to the side of the limit baffle away from the gear part, and the first opening is located at the protrusion.

[0018] Such an arrangement can ensure that the first opening and the accommodating cavity have a sufficiently large contact space, thereby improving the efficiency of the lubricating oil entering the oil guide groove.

[0019] As an optional embodiment, the protrusion is located at an end of the gear shaft facing away from the motor assembly.

[0020] Such an arrangement allows the protrusion to utilize the space on the side of the reducer assembly facing away from the motor assembly, thereby avoiding interference between the protrusion and the structure of the shell in the accommodating cavity.

[0021] As an optional embodiment, there may be multiple first bearings, and the multiple first bearings are arranged at intervals along the axial direction of the gear shaft; the second opening is located between two adjacent first bearings.

[0022] With such an arrangement, the lubricating oil flowing out through the second opening can simultaneously ensure that the plurality of first bearings have a good lubrication effect.

[0023] As an optional implementation, a sealing member is provided at the slot opening of the oil guide slot, and the sealing member is located on a side of the first opening away from the second opening.

[0024] This arrangement can prevent the lubricating oil entering the oil guide groove from leaking out of the groove opening.

[0025] As an optional embodiment, the reducer assembly may further include a planetary carrier and a differential, the gear shaft is connected to the planetary carrier, and the planetary carrier is connected to the differential; the gear part may include a first gear part and a second gear part, the first gear part is engaged with the output end of the motor assembly, and the second gear part is engaged with the center wheel.

[0026] Such an arrangement can improve the structural compactness of the reducer assembly, reduce space occupancy, and facilitate the miniaturization design of the electric drive system.

[0027] As an optional embodiment, the motor assembly may include an output shaft, which is coaxially arranged with the central wheel; the output shaft has a third gear portion, which is meshed with the first gear portion.

[0028] With this arrangement, power can be transmitted to the differential through the cooperation of the output shaft and the planetary gear, thereby improving the power transmission efficiency.

[0029] As an optional embodiment, the differential may include a first differential gear, a second differential gear and a differential housing, the planetary carrier is connected to the differential housing, the first differential gear is connected to the differential housing; the second differential gear is meshed with the first differential gear; the electric drive system may also include a drive shaft, the output shaft has a connecting hole, the drive shaft is passed through the connecting hole, and the drive shaft is connected to the second differential gear.

[0030] With this arrangement, the drive shaft fully utilizes the axial space in the middle of the motor assembly, thereby improving the space utilization within the electric drive system while being able to output power.

[0031] In a second aspect, the present application provides a vehicle comprising the electric drive system in the above technical solution.

[0032] The present application provides an electric drive system, which includes a housing, a motor assembly and a reducer assembly; the housing has a accommodating cavity, and the motor assembly and the reducer assembly are both arranged in the accommodating cavity; the reducer assembly includes a center wheel and a planetary wheel; the output end of the motor assembly is connected to the planetary wheel, and the planetary wheel is meshed with the center wheel, and the planetary wheel includes a gear shaft, a gear part and a first bearing; the gear part is sleeved on the gear shaft, and the first bearing is arranged in the gap between the gear shaft and the gear part; the gear shaft is provided with an oil guide groove, and the oil guide groove connects the accommodating cavity and the gap, so that the lubricating oil in the accommodating cavity can be guided to the gap between the gear shaft and the gear part through the oil guide groove, and then the lubricating oil can enter the first bearing, thereby improving the lubrication effect of the first bearing, reducing the wear of the first bearing, and improving the service life of the reducer assembly and the reliability of the electric drive system.

[0033] In addition to the technical problems solved by the embodiments of the present application, the technical features constituting the technical solutions, and the beneficial effects brought by the technical features, other technical problems solved by the electric drive system and the vehicle provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought by the technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0035] Figure 1 A structural schematic diagram of the electric drive system provided by the embodiments of the present application is shown in the figure.

[0036] Figure 2 A structural schematic diagram of the reducer assembly in the electric drive system provided by the embodiments of the present application is shown in the figure.

[0037] Figure 3 A structural schematic diagram of the reducer assembly in the electric drive system provided by the embodiments of the present application is shown in the figure. Figure 2 A partial view of position A in the figure.

[0038] Figure 4 A sectional view of the electric drive system provided by the embodiments of the present application is shown in the figure.

[0039] Figure 5 A sectional view of the electric drive system provided by the embodiments of the present application is shown in the figure. Figure 4 A partial view of position B in the figure.

[0040] Figure 6 A structural schematic diagram of the gear shaft in the electric drive system provided by the embodiments of the present application is shown in the figure.

[0041] Figure 7 A sectional view of the gear shaft in the electric drive system provided by the embodiments of the present application is shown in the figure.

[0042] Figure 8 A front view of the reducer assembly in the electric drive system provided by the embodiments of the present application is shown in the figure.

[0043] Figure 9 An exploded view of the reducer assembly and the transmission shaft in the electric drive system provided by the embodiments of the present application is shown in the figure.

[0044] Explanation of reference signs:

[0045] 10 - electric drive system;

[0046] 100 - housing; 101 - accommodating cavity;

[0047] 200 - motor assembly; 210 - output shaft; 211 - third gear unit;

[0048] 300 - reducer assembly; 310 - center gear; 320 - planetary gear; 321 - gear shaft; 3211 - oil guide groove; 3211a - notch; 3212 - first opening; 3213 - second opening; 3214 - protrusion; 322 - gear unit; 322a - first gear unit; 322b - second gear unit; 323 - first bearing; 324 - limit baffle; 325 - seal; 330 - planetary carrier; 340 - differential; 341 - first differential gear; 342 - second differential gear; 343 - differential housing;

[0049] 400-Drive shaft. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art may adjust them as needed to suit specific applications.

[0052] Secondly, it should be noted that in the description of this application, terms such as "front", "back", "left", "right", "up", "down", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application.

[0053] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0054] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0055] Currently, the electric drive systems of new energy vehicles are rapidly developing toward high power density, low cost, high integration, and high efficiency. This trend requires high power density and compact motors. Electric drive systems in new energy vehicles typically integrate a motor and a reducer. The motor's output shaft works with the reducer, reducing the rotation of the motor's output shaft and outputting power. The reducer consists of multiple gears that mesh sequentially to transmit power. The gears are supported by a gear shaft, with needle roller bearings positioned between the shaft and the gears.

[0056] However, in the current electric drive system, the gears on the gear shaft of the reducer need to be limited and fixed in the axial direction, so that the gears need to be limited and blocked in the axial direction. The lubricating oil in the reducer is not easy to enter the needle bearing, and the gear shaft is located at the center of the gear. When the gear rotates, the centrifugal force can easily throw the lubricating oil away, resulting in poor lubrication effect of the needle bearing and easy wear, which in turn leads to poor working reliability of the electric drive system.

[0057] In response to the above problems, an embodiment of the present application provides an electric drive system and a vehicle. By arranging an oil guide structure on the gear shaft of the reducer in the electric drive system, the lubricating oil in the space where the reducer is located is guided to the bearings on the gear shaft, thereby fully lubricating the bearings, reducing the wear of the bearings of the reducer during operation, and improving the working reliability of the electric drive system.

[0058] The technical solution of this application will be described in detail below through specific embodiments.

[0059] Figure 1 This is a schematic diagram of the structure of the electric drive system provided in an embodiment of the present application. Figure 2 This is a schematic diagram of the structure of the reducer assembly in the electric drive system provided by an embodiment of the present application. Figure 3 for Figure 2 Partial view of position A in the middle, Figure 4 A cross-sectional view of the electric drive system provided in an embodiment of the present application, Figure 5 for Figure 4 Partial view of position B in the middle.

[0060] like Figures 1 to 5As shown, an embodiment of the present application provides an electric drive system 10, which includes a housing 100, a motor assembly 200 and a reducer assembly 300. The housing 100 has a receiving chamber 101, and the motor assembly 200 and the reducer assembly 300 are both arranged in the receiving chamber 101, which can play a role in installing and fixing the motor assembly 200 and the reducer assembly 300. When the motor assembly 200 and the reducer assembly 300 are arranged in the receiving chamber 101, the inner wall of the housing 100 supports the motor assembly 200 and the reducer assembly 300. The motor assembly 200 can output a rotational speed after being energized, and the power of the motor assembly 200 can be transmitted to the reducer assembly 300. The reducer assembly 300 is used to reduce the rotational speed of the motor assembly 200 and output it.

[0061] Among them, the reducer assembly 300 includes a center wheel 310 and a planetary wheel 320, the output end of the motor assembly 200 is docked with the planetary wheel 320, and the planetary wheel 320 is meshed with the center wheel 310. The accommodating chamber 101 includes a reducer compartment and a motor compartment, the reducer assembly 300 is located in the reducer compartment, and the motor assembly 200 is located in the motor compartment. Lubricating oil is injected into the reducer compartment to lubricate the center wheel 310 and the planetary wheel 320 of the reducer. The reducer compartment and the motor compartment are relatively isolated to prevent the lubricating oil from entering the motor compartment and affecting the working environment of the motor assembly 200.

[0062] In some embodiments, the planetary gear 320 includes a gear shaft 321, a gear portion 322, and a first bearing 323. The gear portion 322 is sleeved on the gear shaft 321, and the first bearing 323 is disposed in the gap between the gear shaft 321 and the gear portion 322. The gear shaft 321 is provided with an oil guide groove 3211, which connects the accommodating cavity 101 and the gap.

[0063] It will be appreciated that when motor assembly 200 outputs power, the power is transmitted from the motor's output end to planetary gear 320. While planetary gear 320 revolves relative to center gear 310, it also rotates on its own axis. As planetary gear 320 rotates, gear portion 322 rotates relative to gear shaft 321. First bearing 323 ensures smooth rotation of gear portion 322 relative to gear shaft 321.

[0064] For example, the first bearing 323 may be a needle bearing. The first bearing 323 abuts between the outer wall of the gear shaft 321 and the inner wall of the gear portion 322. The oil guide groove 3211 can guide the lubricating oil in the reducer compartment where the reducer assembly 300 is located to the first bearing 323, thereby lubricating the first bearing 323.

[0065] It should be noted that in the electric drive system 10 provided by the embodiments of the present application, the gear shaft 321 of the planetary gear 320 of the speed reducer assembly 300 is provided with an oil guide groove 3211, and when the speed reducer assembly 300 is working, the planetary gear 320 can bring up lubricating oil in the process of revolution and rotation, the lubricating oil can be guided into the gap between the gear shaft 321 and the gear part 322 through the oil guide groove 3211, and then the lubricating oil can enter the first bearing 323, thereby improving the lubricating effect of the first bearing 323, reducing the wear of the first bearing 323, and improving the service life of the speed reducer assembly 300 and the reliability of the electric drive system 10.

[0066] Next, the specific structure of the oil guide groove 3211 will be described in detail.

[0067] Figure 6 A structural schematic diagram of a gear shaft in an electric drive system provided by the embodiments of the present application is shown in Figure 7 A sectional view of a gear shaft in an electric drive system provided by the embodiments of the present application is shown in

[0068] Please refer to Figures 2 to 7 In a possible implementation, the slot 3211a of the oil guide groove 3211 is located at the axial end of the gear shaft 321, and the oil guide groove 3211 extends along the axial direction of the gear shaft 321. The oil guide groove 3211 can guide the lubricating oil to flow along the axial direction of the gear shaft 321, thereby improving the flow smoothness of the lubricating oil.

[0069] It can be understood that the oil guide groove 3211 can extend from the end of the gear shaft 321 to the middle of the gear shaft 321 along the axial direction of the gear shaft 321. Since the first bearing 323 is between the gear shaft 321 and the gear part 322, the side of the first bearing 323 facing the end of the gear shaft 321 is more likely to contact the lubricating oil on the gear part 322, while the side of the first bearing 323 facing the middle of the gear shaft 321 cannot directly contact the lubricating oil on the gear part 322. The oil guide groove 3211 guides the lubricating oil from the end of the gear shaft 321 to the middle of the gear shaft 321, so that the side of the first bearing 323 facing the middle of the gear shaft 321 can contact the lubricating oil. In this way, the first bearing 323 as a whole has better lubricating effect.

[0070] For example, the cross section of the oil guide groove 3211 is circular, and the oil guide groove 3211 is coaxially arranged with the gear shaft 321, thereby improving the processing convenience of the oil guide groove 3211 on the gear shaft 321. Alternatively, the cross section of the oil guide groove 3211 can be square, oval or other shapes, which are not limited in the embodiments of the present application.

[0071] In some embodiments, the length of the oil guide groove 3211 is less than the axial length of the gear shaft 321, so that the lubricating oil can be guided to the middle position of the gear, thereby improving the lubricating effect of the first bearing 323 near the middle position of the gear shaft 321.

[0072] For example, the length of the oil guide groove 3211 may be equal to or approximately half the length of the gear shaft 321. The embodiment of the present application does not limit the specific length values ​​of the gear shaft 321 and the oil guide groove 3211.

[0073] In some embodiments, the oil guide groove 3211 is provided with a first opening 3212 and a second opening 3213. The first opening 3212 is located at an end of the oil guide groove 3211 near the end of the gear shaft 321 and communicates with the accommodating cavity 101. The second opening 3213 is located at an end of the oil guide groove 3211 away from the end of the gear shaft 321 and opposite the first bearing 323. The second opening 3213 communicates with the gap between the gear shaft 321 and the gear portion 322.

[0074] Among them, the first opening 3212 is in an exposed state relative to the gear shaft 321. The first opening 3212 can directly contact the lubricating oil in the space where the reducer assembly 300 is located, and the second opening 3213 connects the oil guide groove 3211 with the gap between the gear shaft 321 and the gear part 322.

[0075] It can be understood that the first opening 3212 can serve as the oil inlet of the oil guide groove 3211, and the second opening 3213 can serve as the oil outlet of the oil guide groove 3211. Lubricating oil can be introduced from the first opening 3212 and discharged to the first bearing 323 through the second opening 3213 to ensure a good lubrication effect.

[0076] Exemplarily, the first opening 3212 is arranged along the radial direction of the gear shaft 321, and the lubricating oil can enter the oil guide groove 3211 along the radial direction of the gear shaft 321. After the lubricating oil enters the oil guide groove 3211, it can be ensured that the lubricating oil flows along the oil guide groove 3211 to avoid backflow of the lubricating oil.

[0077] Exemplarily, the second opening 3213 is arranged along the radial direction of the gear shaft 321. When the lubricating oil flows along the length direction of the oil guide groove 3211 to one end of the principle groove 3211a of the oil guide groove 3211, the lubricating oil can flow out of the oil guide groove 3211 along the radial direction of the gear shaft 321 and enter the gap where the first bearing 323 is located.

[0078] For example, the second opening 3213 may penetrate both sides of the gear shaft 321 along the radial direction of the gear shaft 321 to improve the efficiency of lubricating fluid entering the gap between the gear portion 322 and the gear shaft 321 .

[0079] In some embodiments, a limit baffle 324 is respectively provided at both ends of the gear portion 322, and a protrusion 3214 is provided at one end of the gear shaft 321. The protrusion 3214 extends to the side of the limit baffle 324 away from the gear portion 322, and the first opening 3212 is located on the protrusion 3214, thereby ensuring that the first opening 3212 and the accommodating cavity 101 have a sufficiently large contact space, thereby improving the efficiency of the lubricating oil entering the oil guide groove 3211.

[0080] It is understood that the stopper 324 can ensure the accuracy of the axial assembly position of the gear portion 322 and the gear shaft 321, thereby ensuring that the planetary gears 320 and the central gear 310 can accurately engage during assembly of the reducer assembly 300. The stopper 324 can be positioned at both ends of the gap formed between the gear portion 322 and the gear shaft 321. The protrusion 3214 extends a certain distance beyond the end of the gear portion 322, allowing the lubricating oil in the reducer housing where the reducer assembly 300 is located to more easily enter the oil guide groove 3211 through the first opening 3212.

[0081] Please continue to refer to Figures 2 to 7 In some embodiments, the protrusion 3214 is located at the end of the gear shaft 321 away from the motor assembly 200, so that the protrusion 3214 can utilize the space on the side of the reducer assembly 300 away from the motor assembly 200, avoiding interference between the protrusion 3214 and the structure of the shell 100 in the accommodating cavity 101.

[0082] For example, the protrusion 3214 has an oil-guiding surface, and the first opening 3212 can be disposed on the oil-guiding surface. The oil-guiding surface facilitates the lubricating oil to adhere to the protrusion 3214 and enter the oil-guiding groove 3211 through the first opening 3212. Furthermore, when manufacturing the gear shaft 321, the oil-guiding surface is formed first, making it easier to form the first opening 3212 on the gear shaft 321.

[0083] In some embodiments, there may be a plurality of first bearings 323 , and the plurality of first bearings 323 are arranged at intervals along the axial direction of the gear shaft 321 , and the second opening 3213 is located between two adjacent first bearings 323 .

[0084] It is understood that the gear shaft 321 has a certain length, and multiple first bearings 323 can be supported at different positions along the length of the gear shaft 321 to ensure smooth rotation of the gear portion 322 relative to the gear shaft 321. The lubricating oil flowing out of the oil guide groove 3211 is guided between adjacent first bearings 323 through the second opening 3213, thereby ensuring good lubrication of multiple first bearings 323 at the same time.

[0085] For example, there are two first bearings 323, both of which are needle bearings. The number of first bearings 323 provided between the gear shaft 321 and the gear portion 322 may also be three or more, which is not specifically limited in this embodiment of the present application.

[0086] In some embodiments, a seal 325 is provided at the slot 3211a of the oil guide slot 3211. The seal 325 is located on a side of the first opening 3212 away from the second opening 3213, thereby preventing the lubricating oil entering the oil guide slot 3211 from leaking from the slot 3211a.

[0087] It is understandable that the sealing member 325 may be interference fit with the inner wall of the notch 3211a of the oil guide groove 3211. For example, the sealing member 325 may be a steel ball.

[0088] The transmission method of the speed reducer assembly 300 is described in detail below.

[0089] Figure 8 This is a front view of the reducer assembly in the electric drive system provided by an embodiment of the present application. Figure 9 This is an exploded diagram of the reducer assembly and drive shaft in the electric drive system provided in an embodiment of the present application.

[0090] Please refer to Figure 8 and Figure 9 , and combined with Figures 2 to 5 In one possible implementation, the reducer assembly 300 may further include a planetary carrier 330 and a differential 340. The gear shaft 321 is connected to the planetary carrier 330, and the planetary carrier 330 is connected to the differential 340. The gear portion 322 may include a first gear portion 322a and a second gear portion 322b. The first gear portion 322a is engaged with the output end of the motor assembly 200, and the second gear portion 322b is engaged with the center gear 310.

[0091] It is understood that the first gear portion 322a and the second gear portion 322b are coaxially arranged, with the first gear portion 322a externally meshing with the output end of the motor assembly 200. The center gear 310 is an internal gear, and the second gear portion 322b internally meshes with the center gear 310, thereby forming a double-linked planetary gear structure. This improves the structural compactness of the speed reducer assembly 300, reduces space usage, and facilitates the miniaturization of the electric drive system 10.

[0092] In some embodiments, the motor assembly 200 may include an output shaft 210, which is coaxially arranged with the center wheel 310; the output shaft 210 has a third gear portion 211, which is engaged with the first gear portion 322a, so that power can be transmitted to the differential 340 through the cooperation of the output shaft 210 and the planetary gear 320, thereby improving the power transmission efficiency.

[0093] There are multiple planetary gears 320, which are spaced apart circumferentially around the center gear 310, and the third gear portion 211 is simultaneously engaged with the multiple planetary gears. For example, the number of planetary gears 320 can be two, three, four, or more, which is not specifically limited in this embodiment of the present application.

[0094] In some embodiments, the differential 340 may include a first differential gear 341, a second differential gear 342, and a differential housing 343. The planetary carrier 330 is connected to the differential housing 343. The first differential gear 341 is connected to the differential housing 343; the second differential gear 342 meshes with the first differential gear 341. The electric drive system 10 may further include a transmission shaft 400. The output shaft 210 has a connecting hole. The transmission shaft 400 extends through the connecting hole and is connected to the second differential gear 342. The transmission shaft 400 extends through the output shaft 210 of the motor assembly 200, fully utilizing the axial space in the middle of the motor assembly 200, thereby improving space utilization within the electric drive system 10 while still allowing power output.

[0095] It is understood that when the electric drive system 10 is operating, the output shaft 210 rotates, and the output shaft 210 drives the planetary gears 320 to rotate via the third gear portion 211, and the planetary gears 320 revolve around the center gear 310. Because the central axis of the planetary gears 320 is connected to the planetary carrier 330, the planetary carrier 330 drives the differential housing 343 to revolve around the center gear 310. In turn, the differential housing 343 drives the first differential gear 341 to revolve around the axial direction of the center gear 310, so that the first differential gear 341 drives the second differential gear 342 to rotate. The second differential gear 342 can then drive the transmission shaft 400 to rotate, and the transmission shaft 400 can output power to the outside of the electric drive system 10.

[0096] For example, the second differential gear 342 and the first differential gear 341 can both be bevel gears. The axial direction of the first differential gear 341 is perpendicular to the rotation axis of the output shaft 210. The second differential gear 342, the output shaft 210, and the transmission shaft 400 are coaxially arranged.

[0097] Exemplarily, there are two second differential gears 342 and two first differential gears 341, and the two second differential gears 342 are simultaneously meshed with the two first differential gears 341. When the electric drive system 10 is applied to a vehicle, the vehicle has two output half-shafts. One of the two second differential gears 342 is connected to the drive shaft 400 and transmits power to the output half-shaft at one end of the electric drive system 10 via the drive shaft 400. The other of the two second differential gears 342 can directly transmit power to the other output half-shaft. When the vehicle turns, there is a speed difference between the two sides of the vehicle. The rotation of the two first differential gears 341 can achieve a differential output of the two second differential gears 342.

[0098] It should be noted that the planetary carrier 330 is connected with the differential housing 100. For example, the planetary carrier 330 and the differential housing 100 can be an integral part, or the planetary carrier 330 and the differential housing 100 can be welded, and the embodiments of the present application do not make specific limitations.

[0099] The embodiments of the present application also provide an automobile, which can include the electric drive system 10 in the above technical solutions. The automobile provided by the embodiments of the present application can be a new energy automobile, including but not limited to a pure electric vehicle, a hybrid electric vehicle, a hydrogen energy vehicle, etc., and the embodiments of the present application do not make specific limitations.

[0100] The automobile provided by the embodiments of the present application has all the technical solutions and all the technical effects of the foregoing electric drive system 10, which will not be described here.

[0101] The present application provides an electric drive system 10, which includes a housing 100, a motor assembly 200 and a reducer assembly 300; the housing 100 has a receiving cavity 101, and the motor assembly 200 and the reducer assembly 300 are both arranged in the receiving cavity 101; the reducer assembly 300 includes a center wheel 310 and a planetary wheel 320; the output end of the motor assembly 200 is connected with the planetary wheel 320, the planetary wheel 320 is engaged with the center wheel 310, and the planetary wheel 320 includes a gear shaft 321, a gear part 322 and a first bearing 323; the gear part 322 is sleeved on the gear shaft 321, and the first bearing 323 is arranged in the gap between the gear shaft 321 and the gear part 322; the gear shaft 321 is provided with an oil guide groove 3211, and the oil guide groove 3211 is communicated with the receiving cavity 101 and the gap, so that the lubricating oil in the receiving cavity 101 can be guided into the gap between the gear shaft 321 and the gear part 322 through the oil guide groove 3211, and then the lubricating oil can enter the first bearing 323, thereby improving the lubrication effect of the first bearing 323, reducing the wear of the first bearing 323, and improving the service life of the reducer assembly 300 and the reliability of the electric drive system 10.

[0102] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric drive system, characterized in that: The invention comprises a housing, a motor assembly and a reducer assembly; the housing has a receiving cavity, and the motor assembly and the reducer assembly are both arranged in the receiving cavity; the reducer assembly comprises a central wheel and planetary wheels; the output end of the motor assembly is connected to the planetary wheels, and the planetary wheels are meshed with the central wheel; The planetary gear includes a gear shaft, a gear part and a first bearing; the gear part is sleeved on the gear shaft, and the first bearing is arranged in the gap between the gear shaft and the gear part; the gear shaft is provided with an oil guide groove, and the oil guide groove connects the accommodating cavity and the gap.

2. The electric drive system according to claim 1, characterized in that: The notch of the oil guide groove is located at the axial end of the gear shaft; and the oil guide groove extends along the axial direction of the gear shaft.

3. The electric drive system according to claim 2, characterized in that: The length of the oil guide groove is smaller than the axial length of the gear shaft.

4. The electric drive system according to any one of claims 1 to 3, characterized in that: The oil guide groove is provided with a first opening and a second opening; the first opening is located at one end of the oil guide groove close to the end of the gear shaft and is connected to the accommodating cavity; the second opening is located at one end of the oil guide groove away from the end of the gear shaft and is opposite to the first bearing; the second opening is connected to the gap.

5. The electric drive system according to claim 4, characterized in that: The first opening is arranged along the radial direction of the gear shaft; and / or the second opening is arranged along the radial direction of the gear shaft.

6. The electric drive system according to claim 4, characterized in that: Both ends of the gear part are respectively provided with a limit baffle; one end of the gear shaft has a protrusion, the protrusion extends to a side of the limit baffle away from the gear part, and the first opening is located at the protrusion.

7. The electric drive system according to claim 6, characterized in that: The protrusion is located at an end of the gear shaft facing away from the motor assembly.

8. The electric drive system according to claim 4, characterized in that: There are multiple first bearings, and the multiple first bearings are arranged at intervals along the axial direction of the gear shaft; the second opening is located between two adjacent first bearings.

9. The electric drive system according to claim 4, characterized in that: A sealing member is provided at the slot opening of the oil guide slot, and the sealing member is located at a side of the first opening away from the second opening.

10. The electric drive system according to any one of claims 1 to 3, characterized in that: The reducer assembly also includes a planetary carrier and a differential, the gear shaft is connected to the planetary carrier, and the planetary carrier is connected to the differential; the gear part includes a first gear part and a second gear part, the first gear part is engaged with the output end of the motor assembly, and the second gear part is engaged with the center wheel.

11. The electric drive system according to claim 10, characterized in that: The motor assembly includes an output shaft, which is coaxially arranged with the central wheel; the output shaft has a third gear portion, which is meshed with the first gear portion.

12. The electric drive system according to claim 11, characterized in that: The differential includes a first differential gear, a second differential gear and a differential housing, the planetary carrier is connected to the differential housing, the first differential gear is connected to the differential housing; the second differential gear is meshed with the first differential gear; the electric drive system also includes a transmission shaft, the output shaft has a connecting hole, the transmission shaft is passed through the connecting hole, and the transmission shaft is connected to the second differential gear.

13. A vehicle, characterized in that: The electric drive system comprises the electric drive system according to any one of claims 1 to 12.

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