Wheel driving mechanism and vehicle having same

Abstract

A wheel driving mechanism (1) and a vehicle having same. The wheel driving mechanism (1) comprises: a rotating support (10), the rotating support (10) being internally provided with a matching cavity (11); a speed reduction assembly, the speed reduction assembly cooperating with the rotating support (10) and driving the rotating support (10) to rotate; a first fixing shaft (31), which passes through the rotating support (10) and is fixed to the rotating support (10) by means of a first fixing member (33); and a plurality of differential gears (32), the differential gears (32) being rotatably mounted on the first fixing shaft (31) and located in the matching cavity (11).

Description

Wheel drive mechanism and vehicle having the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410006444.X and application date of January 2, 2024, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to, but is not limited to, the field of vehicle technology, and in particular to a wheel drive mechanism and a vehicle having the wheel drive mechanism. Background Art

[0004] In an optional manner, two differential gears arranged opposite to each other in a traditional bevel gear differential cooperate with each other, so most traditional bevel gear differentials have two differential gears or four differential gears, and the number of differential gears is limited. Summary of the Invention

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] One purpose of the present application is to propose a wheel drive mechanism, in which a first fixed shaft is fixed to a rotating bracket through a first fixing member, and a differential gear is set on the first fixed shaft. There is no need to set a mutually matching connection structure between the differential gears, and there is no limit on the number of differential gears, which facilitates the design of multiple differential gears according to design requirements.

[0007] Another object of the present application is to provide a vehicle.

[0008] According to the first aspect of the present application, the wheel drive mechanism includes: a rotating bracket having a mating cavity therein; a reduction assembly that cooperates with the rotating bracket and drives the rotating bracket to rotate; a first fixed shaft that passes through the rotating bracket and is fixed to the rotating bracket by a first fixing member; and a plurality of differential gears that are rotatably mounted on the first fixed shaft and are located in the mating cavity.

[0009] According to the wheel drive mechanism of the embodiment of the present application, the first fixed shaft is fixed to the rotating bracket through the first fixing member, and the differential gear is set on the first fixed shaft. There is no need to set a structure for mutual matching connection between the differential gears, which will not limit the number of differential gears and is convenient for designing multiple differential gears according to design requirements.

[0010] According to a second aspect of the present application, a vehicle is provided. The vehicle includes a wheel drive mechanism according to the first aspect of the present application.

[0011] According to the vehicle of the embodiment of the present application, by utilizing the wheel drive mechanism of the embodiment of the first aspect of the present application, the first fixed shaft is fixed to the rotating bracket through the first fixing member, and the differential gear is set on the first fixed shaft. There is no need to set a structure for mutual matching connection between the differential gears, which will not limit the number of differential gears, and it is convenient to design multiple differential gears according to design requirements.

[0012] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application.

[0013] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a cross-sectional view of a wheel drive mechanism according to an embodiment of the present application.

[0015] FIG2 is a cross-sectional view of a partial structure of a wheel drive mechanism according to an embodiment of the present application.

[0016] FIG3 is a schematic diagram of a partial structure of a wheel drive mechanism according to an embodiment of the present application.

[0017] FIG4 is a cross-sectional view of the structure of the reduction gear assembly, the differential gear, and the first fixed shaft according to an embodiment of the present application.

[0018] FIG5 is a schematic structural diagram of a cover plate according to an embodiment of the present application.

[0019] FIG6 is a cross-sectional view of the structure of the cover according to an embodiment of the present application.

[0020] FIG7 is a schematic structural diagram of a rotating bracket according to an embodiment of the present application.

[0021] FIG8 is a schematic structural diagram of an oil distribution sleeve according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0023] The wheel drive mechanism 1 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0024] As shown in FIG. 1 to FIG. 8 , the wheel drive mechanism 1 according to an embodiment of the present application includes a rotating bracket 10 , a reduction assembly, a first fixed shaft 31 and a plurality of differential gears 32 .

[0025] The rotating bracket 10 has a mating cavity 11 therein, the reduction assembly cooperates with the rotating bracket 10 and drives the rotating bracket 10 to rotate, the first fixed shaft 31 passes through the rotating bracket 10 and is fixed to the rotating bracket 10 by a first fixing member 33, the differential gear 32 is rotatably mounted on the first fixed shaft 31 and is located in the mating cavity 11, when the reduction assembly drives the rotating bracket 10 to rotate, the rotating bracket 10 can drive the differential gear 32 to rotate through the first fixed shaft 31, and the multiple differential gears 32 can drive the wheels to rotate when they rotate around the rotation center of the rotating bracket 10.

[0026] Among them, when the vehicle turns, the wheels exert a force on the differential gear 32 to cause the differential gear 32 to rotate relative to the first fixed shaft 31, thereby adjusting the rotation speed of the two wheels so that the two wheels rotate at different speeds, which is convenient for adjusting the rotation speed of the wheels when the vehicle turns.

[0027] Specifically, the reduction assembly is used to reduce the rotation speed and increase the torque to drive the rotating bracket 10 to rotate, so that the rotating bracket 10 can drive multiple differential gears 32 to rotate through the first fixed shaft 31, and then use the differential gears 32 to drive the wheels to rotate to drive the vehicle.

[0028] The first fixed shaft 31 is fixed to the rotating bracket 10 through the first fixing member 33, and the differential gear 32 is rotatably set on the first fixed shaft 31. This setting method of the differential gear 32 is relatively simple and easy to implement. There is no need to set a mutually matching connection structure between the differential gears 32, which will not limit the number of differential gears 32, making it easy to design multiple differential gears 32 according to design requirements.

[0029] According to the wheel drive mechanism 1 of the embodiment of the present application, the first fixed shaft 31 is fixed to the rotating bracket 10 through the first fixing member 33, and the differential gear 32 is set on the first fixed shaft 31. There is no need to set a mutually fitting connection structure between the differential gears 32, which will not limit the number of differential gears 32, and it is convenient to design multiple differential gears 32 according to design requirements.

[0030] The wheel drive mechanism 1 according to a specific embodiment of the present application will be described below with reference to the accompanying drawings.

[0031] In some specific embodiments of the present application, as shown in FIG. 1 to FIG. 8 , the wheel drive mechanism 1 includes a rotating bracket 10 , a reduction assembly, a first fixed shaft 31 and a plurality of differential gears 32 .

[0032] In some embodiments of the present application, as shown in Figure 1, the first fixing member 33 is a pin, which is passed through the rotating bracket 10 and the first fixed shaft 31 to fix the rotating bracket 10 and the first fixed shaft 31 together, so that when the rotating bracket 10 rotates, the differential gear 32 can be driven to rotate through the first fixed shaft 31.

[0033] As shown in Figure 1, in this embodiment, the length of the first fixed shaft 31 extends radially along the rotating bracket 10, and the pin extends axially along the rotating bracket 10. The pin passes through the rotating bracket 10 and the first end of the first fixed shaft 31 to securely connect the rotating bracket 10 and the first fixed shaft 31. A differential gear 32 is rotatably secured to the second end of the first fixed shaft 31. The differential gear 32 is located on the side of the first fixed shaft 31 away from the pin, so that the differential gear 32 is positioned within the mating cavity 11.

[0034] Specifically, the first end of the first fixed shaft 31 is a fixed end and is fixed on the rotating bracket 10, and the second end of the first fixed shaft 31 is a free end and is located in the matching cavity 11. This method of fixing the first fixed shaft 31 is relatively simple, and the differential gear 32 can be set in the matching cavity 11 through a simple structure.

[0035] In some embodiments of the present application, as shown in Figure 1, the circumferential area of ​​the first fixed shaft 31 in the mating cavity 11 is smaller than the mating area between the first fixed shaft 31 and the rotating bracket 10. This makes it easier to fix the first fixed shaft 31 on the rotating bracket 10 more firmly, thereby enabling the rotating bracket 10 to smoothly drive the differential gear 32 to rotate through the first fixed shaft 31.

[0036] As shown in Figure 1, in this embodiment, the length direction of the first fixed shaft 31 extends along the radial direction of the rotating bracket 10. The first fixed shaft 31 includes a first part and a second part. The first part cooperates with the rotating bracket 10, and the second part is located in the matching cavity 11. The differential gear 32 is rotatably fixed on the second part.

[0037] Among them, the length of the first part is greater than the length of the second part, so as to increase the matching area between the first fixed shaft 31 and the rotating bracket 10, so that the matching area of ​​the rotating bracket 10 is larger than the circumferential area of ​​the first fixed shaft 31 located in the matching cavity 11, so that the first fixed shaft 31 can be firmly fixed on the rotating bracket 10.

[0038] In some embodiments of the present application, as shown in Figures 3 and 4, the wheel drive mechanism 1 includes three differential gears 32, and the reduction assembly includes three planetary gears. The three planetary gears are provided on the rotating bracket 10 and are evenly alternately arranged with the differential gears 32 along the circumference of the rotating bracket 10, so as to evenly distribute the three planetary gears and the three differential gears 32 on the rotating bracket 10, so as to evenly distribute the stiffness and mass of the rotating bracket 10, so that the force on the rotating bracket 10 is balanced during rotation, so that the rotating bracket 10 can rotate stably.

[0039] In some embodiments, as shown in Figures 1, 2, and 4, the wheel drive mechanism 1 also includes a housing 70, and the rotating bracket 10 and the reduction assembly are both arranged in the housing 70. The rotating bracket 10 is rotatably arranged in the housing 70 through a first bearing 75. The reduction assembly includes a sun gear 21, three first planetary gears 221, three second planetary gears 222 and a ring gear 23. The ring gear 23 is fixed to the inner wall of the housing 70. The sun gear 21 cooperates with the motor, and the motor is used to drive the sun gear 21 to rotate. The sun gear 21 is engaged with the three first planetary gears 221. The three first planetary gears 221 and the three second planetary gears 222 are connected one-to-one. The three second planetary gears 222 are engaged with the ring gear 23 and are rotatably fixed on the rotating bracket 10.

[0040] Since the sun gear 21 is meshed with the three first planetary gears 221, the three first planetary gears 221 are connected to the three second planetary gears 222 in a one-to-one correspondence, and the three second planetary gears 222 are meshed with the ring gear 23, the ring gear 23 is fixed on the housing 70, and the ring gear 23 does not rotate. Therefore, when the sun gear 21 rotates, the sun gear 21 will drive the three first planetary gears 221 to rotate around its own axis and around the axis of the ring gear 23, and the three first planetary gears 221 correspondingly drive the three second planetary gears 222 to rotate around its own axis and around the axis of the ring gear 23. When the three second planetary gears 222 rotate around the axis of the ring gear 23, they can drive the rotating bracket 10 to rotate around the axis of the ring gear 23. When the rotating bracket 10 rotates, it drives the differential gear 32 to rotate through the first fixed shaft 31.

[0041] Among them, the radial dimension of the second planetary gear 222 is smaller than the radial dimension of the first planetary gear 221, which facilitates reducing the radial dimension of the ring gear 23 and thus reducing the radial dimension of the reduction mechanism. In some embodiments, the reduction mechanism further includes a second fixed shaft 24, which connects the first planetary gear 221 and the second planetary gear 222 together. The first planetary gear 221 is used to drive the second planetary gear 222 to rotate. There is no need to set an additional sun gear 21 between the three second planetary gears 222, and the three differential gears 32 are cleverly set between the three second planetary gears 222, which facilitates the integration of the differential gear 32, the reduction mechanism and the rotating bracket 10. In this way, while shortening the radial dimension of the reduction mechanism, it is convenient to reserve a larger design space for the tooth width of the first planetary gear 221 and the second planetary gear 222, thereby facilitating improving the meshing overlap between the first planetary gear 221 and the sun gear 21, and improving the meshing overlap between the second planetary gear 222 and the ring gear 23, thereby facilitating reducing the noise generated during the meshing transmission process.

[0042] In some embodiments, the wheel drive mechanism 1 also includes two half-shaft gears 60, which are located on both sides of the axial direction of the rotating bracket 10 and mesh with the three differential gears 32. When the rotating bracket 10 drives the three differential gears 32 to rotate around the axis of the rotating bracket 10, the differential gears 32 can drive the two half-shaft gears 60 to rotate, thereby driving the two wheels to rotate.

[0043] When the vehicle turns, the wheels on both sides are subjected to different forces. At this time, the half-shaft gears 60 exert a force on the differential gear 32, causing the differential gear 32 to rotate around its own axis. When the differential gear 32 rotates around its own axis, the angular velocities of the two half-shaft gears 60 are no longer the same, allowing the vehicle to turn smoothly.

[0044] To ensure smooth meshing of the two side gears 60 with the three differential gears 32 , twice the number of teeth of the side gears 60 is a multiple of three. For example, the number of teeth of the side gears 60 is x, 2x / 3=n, where n is a positive integer.

[0045] Specifically, the two side gears 60 are the first side gear and the second side gear respectively. The first side gear is engaged with a part of the three differential gears 32 respectively, and the second side gear is engaged with another part of the three differential gears 32 respectively. In order to evenly arrange the three differential gears in the circumferential direction of the side gears 60 and achieve smooth engagement between the two side gears 60 and the three differential gears 32, it is necessary to make twice the number of teeth of the side gears 60 a multiple of three.

[0046] In some optional embodiments of the present application, the differential gear 32 is a bevel gear. Compared with a spur gear, the radial gear of a bevel gear is smaller, so that the three differential gears 32 are all bevel gears, which facilitates reducing the space occupied by the differential gear 32 in the mating cavity 11, thereby reserving more space for other components in the mating cavity 11.

[0047] In some embodiments of the present application, as shown in Figures 1 and 7, the rotating bracket 10 has a first fixed cavity 131, a first annular oil groove 12 and a first oil channel 132. The first oil channel 132 connects the first fixed cavity 131 and the first annular oil groove 12. The first fixed shaft 31 is arranged in the first fixed cavity 131. The first fixed shaft 31 is provided with a first oil guide channel 34. One end opening of the first oil guide channel 34 is connected to the first fixed cavity 131, and the other end opening faces the differential gear 32. The oil can enter the first fixed cavity 131 through the first annular oil groove 12. The oil in the first fixed cavity 131 can flow to the differential gear 32 through the first oil guide channel 34 to lubricate the differential gear 32.

[0048] In some embodiments, as shown in Figure 7, the first fixed cavity 131 is connected to the mating cavity 11, the first fixed shaft 31 includes a first part and a second part, the first part is located in the first fixed cavity 131, and the second part is located in the mating cavity 11. The differential gear 32 is rotatably fixed to the second part, and the outer peripheral wall of the first part is matched with the inner wall of the mating cavity 11. The first fixing member 33 passes through the first part and the rotating bracket 10 to fix the first fixed shaft 31 on the rotating bracket 10, so that when the rotating bracket 10 rotates, the rotating bracket 10 can drive the differential gear 32 to rotate through the first fixed shaft 31.

[0049] In some embodiments, the driving structure includes three differential gears 32, and three first fixed cavities 131 are provided on the rotating bracket 10. The differential gears 32 are installed one-to-one in the corresponding first fixed cavities 131 through the first fixed shafts 31. This method of setting the differential gears 32 on the rotating bracket 10 is relatively simple, and the installation accuracy is low, which facilitates reducing the difficulty of assembly.

[0050] In some embodiments, as shown in FIG. 4 , a gasket 81 is provided between the differential gear 32 and the rotating bracket 10 to reduce wear between the differential gear 32 and the rotating bracket 10 when the differential gear 32 rotates relative to the rotating bracket 10 .

[0051] In some optional embodiments of the present application, as shown in Figure 1, the first oil guide channel 34 includes a first oil guide groove 341 provided on the outer periphery of the first fixed shaft 31 and a second oil guide groove 342 radially extending through the first fixed shaft 31. The first oil guide groove 341 and the second oil guide groove 342 are connected. The oil flowing into the first fixed cavity 131 enters the first oil guide groove 341 into the first oil guide channel 34, flows along the first oil guide groove 341 into the second oil guide groove 342, and the oil flows along the second oil guide groove 342 to the differential gear 32 to lubricate the differential gear 32, so that the differential gear 32 can rotate smoothly relative to the first fixed shaft 31.

[0052] In some embodiments of the present application, as shown in Figures 1 and 7, the rotating bracket 10 has a second fixed cavity 141, a first annular oil groove 12, and a second oil channel 142 connecting the second fixed cavity 141 and the first annular oil groove 12. The reduction assembly includes a second fixed shaft 24 and a planetary gear. The planetary gear is fixed in the second fixed cavity 141 through the second fixed shaft 24. When the planetary gear rotates, the planetary gear drives the rotating bracket 10 to rotate through the second fixed shaft 24.

[0053] Among them, the second fixed shaft 24 is arranged in the second fixed cavity 141, and the second fixed shaft 24 is provided with a second oil guide channel 241. One end opening of the second oil guide channel 241 is connected to the second fixed cavity 141, and the other end opening faces the planetary gear. The oil in the first annular oil groove 12 can enter the second fixed cavity 141 through the second oil channel 142. The oil in the second fixed cavity 141 flows to the planetary gear through the second oil guide channel 241 to lubricate the planetary gear and the second fixed shaft 24, thereby reducing the friction between the planetary gear and the second fixed shaft 24, so that the planetary gear can rotate smoothly relative to the second fixed shaft 24.

[0054] In some embodiments, as shown in Figures 1 and 4, the planetary gear is rotatably connected to the second fixed shaft 24 through the second bearing 76. The planetary gear is fixed to the outer ring of the second bearing 76, and the second fixed shaft 24 is fixed to the inner ring of the second bearing 76. The oil in the second oil guide channel 241 flows to the second bearing 76 to lubricate the second bearing 76, thereby enabling the planetary gear to rotate smoothly relative to the second fixed shaft 24.

[0055] In some embodiments, as shown in FIG2 , the reduction assembly further includes a second fixing member 25, through which the second fixing shaft 24 is fixed to the rotating bracket 10, thereby fixing the planetary gears in the second fixing cavity 141. In some examples, the second fixing member 25 is a pin, and the second fixing shaft 24 extends axially along the rotating bracket 10. The pin extends radially along the rotating bracket 10, and the pin passes through the rotating bracket 10 and the second fixing shaft 24 to fix the second fixing shaft 24 to the rotating bracket 10. Since the planetary gears are rotatably disposed on the second fixing shaft 24, by fixing the second fixing shaft 24 to the rotating bracket 10, the planetary gears can be rotatably disposed in the second fixing cavity 141. As the plurality of planetary gears rotate about the rotation center of the ring gear 23, the plurality of planetary gears can drive the rotating bracket 10 to rotate. When the rotating bracket 10 rotates, the plurality of differential gears 32 can be driven to rotate, thereby utilizing the differential gears to drive the wheels to rotate.

[0056] In some optional embodiments of the present application, as shown in Figure 1, the second oil guide channel 241 includes a third oil guide groove 2411 and a fourth oil guide groove 2412. The third oil guide groove 2411 extends along the axial direction of the second fixed shaft 24, and the fourth oil guide groove 2412 penetrates the second fixed shaft 24 in the radial direction. The third oil guide groove 2411 and the fourth oil guide groove 2412 are connected. The oil in the first annular oil groove 12 will enter the second fixed cavity 141 through the second oil channel 142. The oil in the second fixed cavity 141 flows along the third oil guide groove 2411 to the fourth oil guide groove 2412, and flows along the fourth oil guide groove 2412 to the gap between the second fixed shaft 24 and the planetary gear to lubricate the second fixed shaft 24 and the planetary gear, so that the planetary gear can rotate smoothly relative to the second fixed shaft 24.

[0057] In some embodiments, the planetary gear is rotatably connected to the second fixed shaft 24 through the second bearing 76, the planetary gear is fixed to the outer ring of the second bearing 76, the second fixed shaft 24 is fixed to the inner ring of the second bearing 76, the second oil channel 142 is located outside the first annular oil groove 12, and the second fixed cavity 141 is located at the outer end of the first annular oil channel. When the rotating bracket 10 rotates, the oil will flow outward along the second oil channel 142 and into the second fixed cavity 141 under the action of centrifugal force. The oil in the second fixed cavity 141 flows along the third oil guide groove 2411 to the fourth oil guide groove 2412, and flows along the fourth oil guide groove 2412 to the second bearing 76 between the second fixed shaft 24 and the planetary gear to lubricate the second bearing 76, so as to enable the planetary gear to rotate smoothly relative to the second fixed shaft 24.

[0058] In some other optional embodiments of the present application, the second oil guide groove 342 is located on the outer circumference of the second fixed shaft 24 , and the oil in the second fixed cavity 141 can flow along the second oil guide groove 342 to the second bearing 76 to lubricate the second bearing 76 .

[0059] In some optional embodiments of the present application, the wheel drive mechanism 1 also includes a cover plate 40, which is fixed to the rotating bracket 10. An oil inlet channel 41 is provided on the cover plate 40. The outlet of the oil inlet channel 41 is connected to the first annular oil groove 12, and the external oil flows to the first annular oil groove 12 through the oil inlet channel 41.

[0060] In some embodiments, as shown in FIG. 2 , the cover plate 40 is fixed to the rotating bracket 10 by screws 78 .

[0061] In some embodiments, as shown in Figure 6, in order to facilitate the processing of the oil inlet channel 41, the oil inlet channel 41 is connected to the outside world, and an oil plug 82 is provided at the end of the oil inlet channel 41 away from the mating cavity 11 to seal the oil inlet channel 41 and prevent the oil in the oil inlet channel 41 from leaking.

[0062] In some specific embodiments of the present application, as shown in Figures 6 and 8, the wheel drive mechanism 1 also includes an oil distribution sleeve 50, which is located at one end of the cover plate 40. The peripheral wall of the cover plate 40 has a second annular oil groove 42 connected to the oil inlet channel 41. The oil distribution sleeve 50 is provided with a plurality of oil inlet holes 51, which are connected to the second annular oil groove 42. The oil pipeline is connected to the oil inlet holes 51. The external oil enters the second annular oil groove 42 through the oil inlet holes 51, flows into the oil inlet channel 41 along the second annular oil groove 42, and flows to the first annular oil groove 12 along the oil inlet channel 41 to replenish the first annular oil groove 12 with liquid oil.

[0063] As shown in FIG6 , in this embodiment, sealing grooves 44 are provided on both sides of the second annular oil groove 42 . A sealing member is provided in the sealing groove 44 to seal the gap between the cover plate 40 and the oil sleeve 50 , thereby preventing the oil entering the second annular oil groove 42 from the oil inlet hole 51 from leaking.

[0064] In some specific embodiments of the present application, as shown in Figures 4 and 6, the wheel drive mechanism 1 also includes a half-shaft gear 60, which is engaged with the differential gear 32 and is located in the matching cavity 11. When the rotating bracket 10 rotates and drives the multiple differential gears 32 to rotate, the multiple differential gears 32 can drive the half-shaft gear 60 to rotate, and then drive the wheel to rotate through the half-shaft gear 60. An oil guide hole 43 connected to the oil inlet channel 41 is provided on the cover plate 40, and the oil guide hole 43 faces the matching cavity 11 to lubricate the half-shaft gear 60.

[0065] In some embodiments, the differential gear 32 is a bevel gear, which can rotate relative to the first fixed shaft 31. The rotation center of the bevel gear extends along the length direction of the first fixed shaft 31. When the rotating bracket 10 drives the differential gear 32 to rotate, the centrifugal force applied to the differential gear 32 extends outward along the length direction of the first fixed shaft 31. Since the bevel gear is an open gear and the direction of the centrifugal force is parallel to the axial direction of the bevel gear, when the rotating bracket 10 rotates, the oil can easily enter the meshing area between the bevel gear and the side gear 60, that is, the meshing area between the differential gear 32 and the side gear 60, to facilitate lubrication of the meshing area between the differential gear 32 and the side gear 60.

[0066] It should be noted here that the inside and outside mentioned here are directions relative to the center of the matching cavity 11. The direction closer to the center of the matching cavity 11 is the inward direction, and the direction away from the center of the matching cavity 11 is the outward direction.

[0067] In some specific embodiments of the present application, as shown in Figures 1 and 6, an oil drain hole 45 is also provided on the cover plate 40. The cover plate 40 is rotatably provided on the housing 70 through the third bearing 77. One end of the oil drain hole 45 opens toward the mating cavity 11, and the other end opens toward the third bearing 77. The oil drain hole 45 is used to discharge excess oil in the mating cavity 11 to avoid oil trapping. At the same time, the discharged oil will flow to the third bearing 77, which can lubricate the third bearing 77.

[0068] The following describes a vehicle according to an embodiment of the present application. The vehicle according to the embodiment of the present application includes the wheel drive mechanism 1 according to the above-mentioned embodiment of the present application.

[0069] According to the vehicle of the embodiment of the present application, by utilizing the wheel drive mechanism 1 according to the above-mentioned embodiment of the present application, the first fixed shaft 31 is fixed to the rotating bracket 10 through the first fixing member 33, and the differential gear 32 is set on the first fixed shaft 31. There is no need to set a mutually fitting connection structure between the differential gears 32, and there is no restriction on the number of differential gears 32, which facilitates the design of multiple differential gears 32 according to design requirements.

[0070] Other structures and operations of the vehicle according to the embodiment of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0071] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more. In the description of the present application, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0072] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0073] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and 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.

[0074] 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 application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A wheel drive mechanism, comprising: A rotating bracket having a mating cavity therein; A speed reduction assembly that mates with the rotating bracket and drives the rotating bracket to rotate; A first fixed shaft that passes through the rotating bracket and is fixed to the rotating bracket by a first fixing member; A plurality of differential gears rotatably mounted on the first fixed shaft and located within the mating cavity.

2. The wheel drive mechanism according to claim 1, wherein, The first fixing member is a pin that passes through the rotating bracket and the first fixed shaft.

3. The wheel drive mechanism according to claim 1, wherein, The circumferential surface area of the first fixed shaft within the mating cavity is smaller than the mating area between the first fixed shaft and the rotating bracket.

4. The wheel drive mechanism according to any one of claims 1-3 further comprises: Three differential gears, the speed reduction assembly includes three planet gears, and the three planet gears are disposed on the rotating bracket and are evenly and alternately arranged circumferentially along the rotating bracket with the differential gears.

5. The wheel drive mechanism according to any one of claims 1-4, wherein, The rotating bracket has a first fixed cavity, a first annular oil groove, and a first oil passage connecting the first fixed cavity and the first annular oil groove. The first fixed shaft passes through the first fixed cavity, and the first fixed shaft is provided with a first oil guiding passage. One end opening of the first oil guiding passage communicates with the first fixed cavity, and the other end opening faces the differential gears.

6. The wheel drive mechanism according to claim 5, wherein, The first oil guiding passage includes a first oil guiding groove provided on the outer periphery of the first fixed shaft and a second oil guiding groove radially penetrating along the first fixed shaft. The first oil guiding groove and the second oil guiding groove communicate with each other.

7. The wheel drive mechanism according to any one of claims 1-6, wherein, The rotating bracket has a second fixed cavity, a first annular oil groove, and a second oil passage connecting the second fixed cavity and the first annular oil groove. The speed reduction assembly includes a second fixed shaft and planet gears. The planet gears are fixed in the second fixed cavity through the second fixed shaft. The second fixed shaft passes through the second fixed cavity, and the second fixed shaft is provided with a second oil guiding passage. One end opening of the second oil guiding passage communicates with the second fixed cavity, and the other end opening faces the planet gears.

8. The wheel drive mechanism according to claim 7, wherein, The second oil guiding passage includes a third oil guiding groove axially extending along the second fixed shaft and a fourth oil guiding groove radially penetrating along the second fixed shaft. The third oil guiding groove and the fourth oil guiding groove communicate with each other.

9. The wheel drive mechanism according to any one of claims 5-8 further comprises: A cover plate fixed to the rotating bracket, and an oil inlet passage is provided on the cover plate. The outlet of the oil inlet passage communicates with the first annular oil groove.

10. The wheel drive mechanism according to claim 9 further comprises: An oil distribution sleeve located at one end of the cover plate. The peripheral wall of the cover plate has a second annular oil groove communicating with the oil inlet passage. A plurality of oil inlet holes are provided on the oil distribution sleeve, and the oil inlet holes communicate with the second annular oil groove.

11. The wheel drive mechanism according to claim 9 or 10 further comprises: A side gear that meshes with the differential gears and is located within the mating cavity. An oil guiding hole communicating with the oil inlet passage is provided on the cover plate, and the oil guiding hole faces the mating cavity.

12. A vehicle, comprising: The wheel drive mechanism according to any one of claims 1-11.

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