Planet row speed reducer lubricating structure for coaxial distributed driving

Abstract

The invention relates to the technical field of automobile part structures, in particular to a planet row speed reducer lubricating structure for coaxial distributed driving. Comprising a shell, an input shaft, a gear ring, a plurality of planetary gears, a plurality of planetary shafts, a planetary carrier and an oil receiving disc. The gear ring is of an annular structure fixed to the shell. The planetary gears are arranged at intervals in the circumferential direction of the input shaft with the axis of the input shaft as the center, and the planetary gears are meshed with the input shaft and the gear ring; one end of the planetary shaft penetrates through the planetary gear; the planet carrier is sleeved on the input shaft in a manner of rotating around the axis of the input shaft, the planet carrier is fixedly connected with the other end of the planet shaft in the direction of rotating around the axis of the input shaft, and the oil receiving disc is fixed on one axial side of the planet carrier; and the oil liquid sprayed out of the oil liquid channel of the shell is uniformly distributed to the planet carrier, the planet gear, the planet shaft and the first bearing structure in the axial direction. The speed reducer is simple in structure, a special electronic pump does not need to be configured, the energy effect is greatly reduced, and the problem that the NVH effect is poor is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile component structures, and in particular to a lubrication structure of a planetary gear reducer for coaxial distributed drive. Background Art

[0002] With the development of the new energy industry, passenger car customers have strong demands for acceleration performance, body control, off-road climbing and other functions. Correspondingly, this will drive the development of new energy electric drive assemblies towards high speed, high torque and high power density.

[0003] The traditional single motor + reducer + differential electric drive solution can ensure that the vehicle is driven when the left and right wheels have different speeds, but it cannot actively control the speed and torque of the left and right wheels. In extreme road conditions such as ice and desert, the wheels will inevitably slip, affecting driving safety and performance.

[0004] The distributed drive solution is a dual-motor electric drive solution, which uses one motor on each side to match two reducers on the left and right sides. The function of the differential is realized through motor control, and the speed and torque of the left and right wheel ends can be independently adjusted in real time to meet the customer's driving needs.

[0005] For the distributed drive solution, there are coaxial solutions and parallel shaft solutions. The coaxial solution is relatively more compact and has a higher power density. The coaxial distributed reducer needs to design a lubrication and cooling structure during use. At present, the lubrication and cooling of the reducer with a coaxial distributed drive structure is mainly forced lubrication cooling, that is, the oil is pumped from a low position into the center hole of the input shaft by an electronic pump, and then radially thrown out through the holes on the input shaft to the bearing for cooling; the disadvantage of this solution is that the electronic pump needs to run all the time, which consumes a lot of energy, and because the oil has a higher viscosity at low temperatures, it will cause NVH problems if the oil is not sucked in time. Summary of the invention

[0006] The purpose of this application is to solve the deficiencies of the above-mentioned background technology and to provide a lubrication structure for a planetary gear reducer for coaxial distributed drive.

[0007] The technical solution of the present application is: a lubrication structure of a planetary gear reducer for coaxial distributed drive, comprising:

[0008] case;

[0009] An input shaft, one end of which is connected to a power output device;

[0010] A gear ring, which is an annular structure fixed on the housing;

[0011] A plurality of planetary gears, the plurality of planetary gears being arranged at intervals along the circumference of the input shaft with the axis of the input shaft as the center, the planetary gears being meshed and drivingly connected with the input shaft and being driven by the input shaft to revolve around the axis of the input shaft, the planetary gears being meshed with the ring gear and rotating around their own axes while revolving;

[0012] A plurality of planetary shafts, one end of each of which is arranged along an axis parallel to the input shaft and passes through the planetary gear, and is connected to the planetary gear rotatably around its own axis through a first bearing structure, and the planetary shaft and the planetary gear are arranged coaxially;

[0013] A planet carrier, the planet carrier is sleeved on the input shaft and can rotate around the axis of the input shaft through a second bearing structure, and the planet carrier is fixedly connected to the other end of the planet shaft in the rotation direction around the axis of the input shaft;

[0014] The oil receiving pan is fixed on one axial side of the planet carrier and is used to evenly distribute the oil sprayed from the oil channel of the housing to the planet carrier, the planetary gears, the planetary shaft and the first bearing structure along the axial direction.

[0015] According to a planetary reducer lubrication structure for coaxial distributed drive provided in the present application, the planet carrier is a hollow cavity structure, including a first side close to the input shaft and a second side away from the input shaft; the first side and the second side are arranged axially at intervals, and mounting holes corresponding to the planetary shafts are opened on the first side and the second side; both ends of the planetary shaft are passed through the mounting holes to arrange the planetary gears between the first side and the second side.

[0016] According to a lubrication structure of a planetary reducer for coaxial distributed drive provided in the present application, the oil receiving pan is a hollow cavity structure fixed to the first side by a bolt structure, and an oil distribution structure is arranged in the oil receiving pan; one end of the oil distribution structure is connected to the oil channel on the shell, and the other end axially passes through the first side and penetrates into the interior of the planetary carrier.

[0017] According to a lubrication structure of a planetary reducer for coaxial distributed drive provided in the present application, the oil distribution structure includes an axial distribution pipe arranged on the side of the oil receiving pan facing the planetary carrier; the axial distribution pipe is a hollow tubular structure with openings at both ends, one end of the axial distribution pipe is connected to the inner cavity of the oil receiving pan, and the other end axially passes through the first side and extends into the interior of the planetary carrier.

[0018] According to a lubrication structure of a planetary reducer for coaxial distributed drive provided in the present application, a plurality of axial distribution pipes are arranged on the oil receiving pan, and the plurality of axial distribution pipes are arranged at equal intervals along the circumferential direction of the oil receiving pan with the axis of the oil receiving pan as the center.

[0019] According to a planetary reducer lubrication structure for coaxial distributed drive provided in the present application, a plurality of oil-blocking ribs are arranged in the oil receiving pan; the oil-blocking ribs correspond one-to-one to the axial distribution pipes, and the oil-blocking ribs are raised ribs arranged in the inner cavity of the oil receiving pan for blocking the circumferential flow of oil and allowing the oil to enter the axial distribution pipe.

[0020] According to a lubrication structure of a planetary gear reducer for coaxial distributed drive provided by the present application, the oil retaining rib is located on one side of the corresponding axial distribution pipe along the rotation direction of the oil receiving pan.

[0021] According to a lubrication structure of a planetary reducer for coaxial distributed drive provided in the present application, the oil baffle rib is arranged obliquely along the radial direction of the oil receiving pan, and the end of the oil baffle rib close to the center of the oil receiving pan is in front of the end of the oil baffle rib away from the center of the oil receiving pan along the rotation direction of the oil receiving pan.

[0022] According to a planetary reducer lubrication structure for coaxial distributed drive provided in the present application, the planetary shaft is a hollow shaft-like structure with an opening on one side, and an oil outlet hole is provided on the planetary shaft that radially connects the inner cavity of the planetary shaft and the outer first bearing; the end of the axial distribution pipe away from the oil receiving pan extends axially into the planetary shaft.

[0023] According to a lubrication structure of a planetary gear reducer for coaxial distributed drive provided by the present application, the axial distribution pipe and the oil outlet hole do not overlap in the axial direction of the planetary shaft.

[0024] According to a planetary reducer lubrication structure for coaxial distributed drive provided in the present application, the first bearing structure includes a retaining ring fixed to the inner side of the planetary gear and first bearings arranged on both axial sides of the retaining ring; the oil outlet hole is located between the two groups of first bearings in the axial direction of the planetary shaft.

[0025] According to a planetary reducer lubrication structure for coaxial distributed drive provided by the present application, a plurality of first inner oil passages are arranged on the side of the first side facing the second side; the first inner oil passage is a groove structure that facilitates the flow of oil, and the first inner oil passage is located between two adjacent groups of mounting holes, and the first inner oil passage includes a plurality of first inner flow passages and second inner flow passages; one end of the first inner flow passage is located outside the circumference of the first side, and the other end extends in a direction parallel to a line connecting the center of the mounting hole and the center of the input shaft through hole on the first side; one end of the second inner oil passage is connected to the other end of the first inner oil passage, and the other end extends along a radial direction of the first side to the input shaft through hole.

[0026] According to a planetary reducer lubrication structure for coaxial distributed drive provided by the present application, a plurality of second inner oil circuits are arranged on the side of the second side facing the first side; the second inner oil circuit is a groove structure that facilitates the flow of oil, and the second inner oil circuit is located between two adjacent groups of mounting holes, and the second inner oil circuit includes a plurality of third inner flow channels and a fourth inner flow channel; one end of the third inner flow channel is located outside the circumference of the second side, and the other end extends in a direction parallel to a line connecting the center of the mounting hole and the center of the input shaft through hole on the first side; one end of the fourth inner oil circuit is connected to the other end of the third inner oil circuit, and the other end extends along the radial direction of the second side to the input shaft through hole.

[0027] According to a lubrication structure of a planetary gear reducer for coaxial distributed drive provided by the present application, a through hole for discharging oil in the planetary carrier is provided on the second side.

[0028] According to a lubrication structure of a planetary reducer for coaxial distributed drive provided in the present application, a plurality of through holes are provided on the second side, and the plurality of through holes and the mounting holes of the corresponding planetary shafts are evenly staggered with the axis of the input shaft as the center.

[0029] According to a lubrication structure of a planetary reducer for coaxial distributed drive provided in the present application, the housing includes a first part on the side of the planetary carrier where an oil receiving pan is provided and a second part on the side of the planetary carrier opposite to the oil receiving pan; the oil channel in the housing includes a first oil channel provided in the first part; the first oil channel includes an inlet connected to an oil pump and a first outlet for spraying oil to the oil receiving pan and a second outlet for spraying oil to a second bearing in a second bearing structure.

[0030] According to a planetary reducer lubrication structure for coaxial distributed drive provided in the present application, the oil channel in the housing includes a second oil channel arranged in the second part; the second oil channel includes an inlet connected to the oil pump and a third outlet for spraying oil to the planetary carrier, and a fourth outlet for spraying oil to the fourth bearing in the second bearing structure.

[0031] According to a planetary reducer lubrication structure for coaxial distributed drive provided in the present application, a connecting channel arranged along the axial direction is provided in the input shaft; the inlet end of the connecting channel is connected to the side of the third bearing in the second bearing structure away from the oil receiving pan, and the outlet end is located on the side of the first part away from the oil receiving pan.

[0032] The advantages of the present application are as follows: 1. The present application sets an oil receiving pan on the axial side of the planetary carrier, and uses the oil receiving pan to receive the oil sprayed from the oil channel of the housing, and then transports it to the planetary carrier along the axial direction, so that it can be evenly dispersed in the planetary carrier along the axial direction. Moreover, the oil receiving pan of the present application is directly fixed on the planetary carrier, and the internal oil can be well thrown into the planetary carrier through the rotation without any power drive. The oil in the planetary carrier can also be diffused in the radial direction toward the planetary shaft, the first bearing structure and the planetary gear under the rotation of the planetary carrier, so that the oil can be evenly and fully distributed in the planetary row, achieving good lubrication and cooling effects. The overall structure is simple, and the energy consumption problem of the traditional forced oil injection method is solved. Because there is no need to open a radial hole on the input shaft, there is no problem of poor oil injection due to the limited radial hole structure of the input shaft; the reducer structure of the present application is used for a coaxial distributed drive structure, which can obtain good lubrication and cooling effects and is suitable for large-scale promotion and application;

[0033] 2. The planet carrier of the present application is a hollow cavity structure. On the one hand, the planet carrier of the hollow cavity can facilitate the arrangement of the planetary gears and the planetary shafts, so that the entire planetary gear structure occupies less space. On the other hand, a gap can be formed inside the planet carrier for the passage of oil, which facilitates the flow of lubricating oil, etc. The oil distribution is more uniform and sufficient, so that the operation of the entire planetary gear is smoother;

[0034] 3. The oil receiving pan of the present application is directly fixed to the planetary frame by a bolt structure, and can rotate with the planetary frame, and can evenly disperse the oil into the planetary frame under the centrifugal effect. The installation and arrangement of the oil receiving pan is convenient, and the oil distribution structure in the oil receiving pan can automatically disperse the oil sprayed from the housing into the planetary frame along the axial direction, and the lubrication and cooling effect is excellent;

[0035] 4. The present application arranges an axial distribution pipe on the oil receiving pan, and the axial distribution pipe is directly inserted into the planet carrier along the axial direction, so that the oil can be more fully distributed into the planet carrier along the axial direction, and a good lubrication and cooling effect is produced on the structural components in the planet carrier. The oil will not be blocked by the planet carrier when entering the interior of the planet carrier, and the oil circulation is smoother;

[0036] 5. In the present application, multiple axial distribution pipes are evenly arranged on the oil receiving pan. The evenly arranged multiple axial distribution pipes can further fully disperse the oil into the planetary carrier, so that each position of the planetary gears, the first bearing structure and the planetary shaft in the planetary carrier can be fully infiltrated by the oil, and the cooling and lubrication effect of the oil is greatly improved;

[0037] 6. The present application sets oil retaining ribs inside the oil receiving pan, and a cavity is formed between two adjacent oil retaining ribs. Each cavity corresponds to an axial distribution pipe. Each axial distribution pipe can well guide the oil in the cavity, so that the oil originally flowing in the rotation direction can better enter the axial distribution pipe, and the oil flow is smoother;

[0038] 7. The setting of the oil retaining rib in this application fully considers the structural position of the axial distribution pipe. The axial distribution pipe is located at the tail of the cavity oil flow, so that the axial distribution pipe is just at the position where the oil finally gathers, and the oil can enter the axial distribution pipe more easily;

[0039] 8. The oil retaining ribs of the present application are arranged radially and tilted, which is more convenient for gathering the oil, so that the gathered oil can enter the axial distribution pipe more easily, further improving the effect of the oil entering the axial distribution pipe;

[0040] 9. The planetary shaft of the present application is a hollow structure, and the hollow planetary shaft is convenient for the arrangement of the axial distribution pipe, and the combined structure of the axial distribution pipe and the planetary shaft can conveniently discharge the oil into the planetary shaft, and then the oil is thrown to the first bearing structure and the planetary gear through the oil outlet through the centrifugal action of the planetary shaft itself, which greatly improves the cooling and lubrication effect of the oil;

[0041] 10. The axial distribution pipe of the present application does not overlap with the oil outlet hole, that is, there is a gap between the outlet end of the axial distribution pipe and the oil outlet hole in the axial direction, so that the oil sprayed from the axial distribution pipe can enter the oil outlet hole more conveniently, and the flow of the oil will not be delayed due to the obstruction of the axial distribution pipe;

[0042] 11. The present application designs the position of the oil outlet hole so that the oil sprayed from the oil outlet hole can more easily enter between the two sets of first bearings, making it more convenient to infiltrate the two sets of first bearings, thereby improving the cooling and lubrication effect of the first bearings;

[0043] 12. The present application sets a first inner oil circuit structure on the inner side of the first side, and can use the first inner oil circuit structure to guide the oil entering the planetary carrier from the outer side of the circumference of the first side to the center position of the first side, so that the flowing oil can lubricate and cool the input shaft and other structures in the middle position, thereby improving the smoothness and stability of the operation of the entire planetary gear;

[0044] 13. The present application sets a second inner oil circuit structure on the inner side of the second side, and can use the second inner oil circuit structure to guide the oil entering the planetary carrier from the outer side of the circumference of the second side to the center position of the second side, so that the flowing oil can lubricate and cool the input shaft and other structures in the middle position, thereby improving the smoothness and stability of the operation of the entire planetary gear;

[0045] 14. The present application sets a through hole on the second side of the planet carrier, which can discharge the oil in the planet carrier, facilitating the circulation of the oil in the planet carrier, and also facilitates the oil to enter the planet carrier from the other side. The construction of the through hole reduces the obstruction to the flow of the oil, making the flow of the oil in the planet carrier smoother;

[0046] 15. The through holes of the present application and the mounting holes on the second side are arranged in a staggered manner, which can, on the one hand, allow the oil to fully contact the planetary shaft passing through the mounting holes, and on the other hand, allow the oil to flow in and out evenly on the second side, thereby achieving a better lubrication effect on the internal structure of the oil;

[0047] 16. The present application divides the housing into two parts, and sprays oil on both sides of the planetary gear respectively, so that the oil flows more fully, the infiltration effect on the components in the planetary gear is better, the oil flows smoothly, and the cooling and lubrication effect on the planetary gear is greatly improved;

[0048] 17. The second oil channel is provided on the second part of the present application, which can not only spray oil to lubricate and cool the planetary carrier, but also lubricate and cool the fourth bearing, and the cooling and lubrication effect is excellent;

[0049] 18. The present application provides a connecting channel on the input shaft to facilitate the flow of oil in the entire reducer. The oil circulates and improves the lubrication and cooling effect of the entire reducer.

[0050] The reducer of the present application has a simple structure. By configuring an oil receiving pan, it can automatically distribute the oil into the planetary carrier in the axial direction to fully lubricate and cool the internal structure. There is no need to configure a dedicated electronic pump, which greatly reduces the energy effect and avoids the problem of poor NVH effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 : Schematic diagram of the coaxial distributed drive structure of the present application;

[0052] Figure 2 : Schematic diagram of the cross section of the reducer of the present application;

[0053] Figure 3 : A side view of the reducer of the present application;

[0054] Figure 4 : Schematic diagram of oil flow in the reducer of the present application;

[0055] Figure 5 : Planet carrier shaft view of the present application (first side one side);

[0056] Figure 6 : Planet carrier shaft view of the present application (second side one side);

[0057] Figure 7: Schematic diagram of the inner side of the first side of the planet carrier of the present application;

[0058] Figure 8 : Schematic diagram of the inner side of the second side of the planet carrier of the present application;

[0059] Fig. 9 : Schematic diagram of the oil receiving pan structure of the present application;

[0060] Fig.10 : Schematic diagram of the arrangement of the oil retaining ribs inside the oil receiving pan of the present application;

[0061] Wherein: 1—input shaft; 2—planetary gear; 3—gear ring; 4—planetary shaft; 5—planet carrier; 51—first side; 511—first inner flow channel; 512—second inner flow channel:

[0062] 52—second side; 521—third inner flow channel; 522—fourth inner flow channel;

[0063] 53—mounting hole; 54—through hole;

[0064] 6—housing; 61—first part; 62—second part; 63—first oil channel; 64—second oil channel;

[0065] 7—oil receiving pan; 71—axial distribution pipe; 72—oil retaining rib;

[0066] 8—retaining ring; 9—first bearing; 10—second bearing; 11—third bearing; 12—fourth bearing. DETAILED DESCRIPTION

[0067] The embodiments of the present application are described in detail below, 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 intended to be used to explain the present application, and should not be construed as limiting the present application.

[0068] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships 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 operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0071] The present application is directed to a lubrication structure of a planetary gear reducer for coaxial distributed drive. The reducer of the present application has a planetary gear structure. Each distributed drive electric drive assembly contains two planetary gear reducers on the left and right and two motors, such as Figure 1 As shown. The planetary gears of the reducer of the present application are evenly distributed along the circumference of the input shaft between the ring gear and the planet carrier, and the planetary gears are meshed with the ring gear and the input shaft respectively. In addition, the planetary gears and planetary shafts of the present application are integrated in the planet carrier, and the structure is compact and compact. The axis of revolution of the planetary gear coincides with the axis of the input shaft, and the overall space occupied is extremely small, and the structure is more convenient. In addition, the present application arranges an oil receiving pan on one side of the planet carrier, and the oil receiving pan can disperse the oil into the planet carrier along the axial direction parallel to the input shaft, and lubricate and cool the planetary gears, planetary shafts and bearing structures in the planet carrier. Compared with the method of directly opening holes on the input shaft for radial dispersion, the oil dispersion method of the present application is more sufficient and uniform, and the oil receiving pan is directly fixed on the planet carrier, and can rotate with the planet carrier. During the rotation of the oil receiving pan, the internal oil can be dispersed into the planet carrier by itself under the action of centrifugal force, and there is no need to configure a dedicated forced drive structure. The overall energy consumption is smaller and more suitable for promotion and application.

[0072] Specifically, Fig.10 As shown, a lubrication structure of a planetary reducer for coaxial distributed drive of the present application includes a housing 6, an input shaft 1, a plurality of planetary gears 2, a plurality of planetary shafts 4, a ring gear 3, a planetary carrier 5 and an oil receiving pan 7. One end of the input shaft 1 is connected to a power output device, and the power output device transmits power to the reducer through the input shaft. A spline structure is provided on the input shaft 1 to connect with the power output device, and the power output device is a structure such as a motor. The ring gear 3 is an annular structure fixed in the housing 6, and a rack structure is provided on the inner side of the circumference of the ring gear 3. A plurality of planetary gears 2 are evenly spaced along the circumference of the input shaft 1 with the axis of the input shaft 1 as the center. The plurality of planetary gears 2 of the present application are evenly spaced around the input shaft 1, as shown in FIG. Figure 3As shown, three planetary gears 2 are arranged on the input shaft 1 of the present application, and the three planetary gears 2 are spaced 120° apart. The planetary gears 2 are meshed and connected with the input shaft 1 and driven by the input shaft 1 to revolve around the axis of the input shaft 1. The planetary gears 2 are meshed with the rack structure inside the ring gear 3. Because the planetary gears 2 are evenly distributed between the ring gear 3 and the input shaft 1, the forces between them can offset each other in the radial direction, and the smoothness of the planetary gears 2 during operation is excellent. Driven by the input shaft 1, the planetary gears 2 rotate around the axis of the input shaft 1, that is, they revolve around the input shaft 1 as the center, and the planetary gears 2 themselves rotate between the input shaft 1 and the ring gear 3, and rotate around their own axis, that is, they rotate on their own axis.

[0073] One end of the planetary shaft 4 is arranged in the planetary gear 2 along the axis direction parallel to the input shaft 1. The planetary gear 2 and the planetary shaft 4 are in one-to-one correspondence. Each planetary gear 2 is provided with a planetary shaft 4. The planetary shaft 4 is connected to the planetary gear 2 in a rotatable manner around its own axis through a first bearing structure, that is, the planetary shaft 4 and the planetary gear 2 are relatively rotatably connected in the direction around the axis of the planetary gear 2. The planetary shaft 4 is coaxially arranged with the planetary gear 2 and is fixedly connected in the rotation direction around the axis of the input shaft 1. The planetary shaft 4 is used to output the power of the planetary gear 2.

[0074] The planet carrier 5 is sleeved on the input shaft 1 and can rotate around the axis of the input shaft 1 through the second bearing structure. The planet carrier 5 is fixedly connected to the other end of the planet shaft 4 in the direction of rotation around the axis of the input shaft 1. In other words, the planet carrier 5 is driven by the planet shaft 4 to rotate around the axis of the input shaft 1, and the planet carrier 5 and the input shaft 1 can rotate relative to each other in the direction of the axis around the input shaft 1. The revolution axis of the planetary gear 2, the rotation axis of the planet carrier 5 and the axis of the input shaft 1 coincide. A spline structure is provided on the planet carrier 5, which is connected to the half shaft of the whole vehicle through the spline structure to transmit power to the half shaft of the whole vehicle.

[0075] The oil receiving pan 7 is fixed to one axial side of the planet carrier 5, and is used to evenly distribute the oil sprayed from the oil channel of the housing to the planet carrier 5, the planetary gear 2, the planetary shaft 4 and the first bearing structure along the axial direction. That is, the oil receiving pan 7 is connected to the oil channel in the housing 6, and the oil sprayed from the housing 6 enters the oil receiving pan 7, and then is dispersed axially into the planet carrier 5 by the oil receiving pan 7, so as to lubricate and cool the planetary gear 2, the planetary shaft 4 and the first bearing structure in the planet carrier 5. Because the oil receiving pan 7 is directly fixed to the planet carrier 5, it can rotate around the axis of the input shaft 1 with the planet carrier 5. The oil receiving pan 7 does not need external power, and can rotate around the axis of the input shaft 1 by relying on the drive of the planet carrier 5, so as to evenly disperse the internal oil into the planet carrier 1, so as to achieve a good lubrication and cooling effect.

[0076] The power transmission route of the present application is that the power output device transmits power to the input shaft 1, the input shaft 1 transmits power to the planetary gear 2, the planetary gear 2 transmits power to the planetary shaft 4, the planetary shaft 4 transmits power to the planetary carrier 5, and the planetary carrier 5 transmits power to the half shaft of the whole vehicle.

[0077] The oil flow route of the present application is that the oil pump transports the oil in the oil pan to the housing 6, the housing 6 discharges the oil into the oil receiving pan 7, and the oil receiving pan 7 rotates with the planetary carrier 5 around the axis of the input shaft 1. Under the action of centrifugal force, the oil entering the oil receiving pan 7 will first enter the planetary carrier 5 axially, and the oil entering the planetary carrier 5 will diffuse radially under the action of its own centrifugal force, fully infiltrating the internal planetary gears 2, planetary shafts 4 and the first bearing structure. After completing the cooling and lubrication in the planetary carrier 5, the oil flows out of the planetary carrier 5 and finally flows back to the oil pan to complete the cycle.

[0078] When the reducer of the present application is actually installed: the corresponding retaining ring 8 is selected based on the axial width of the first bearing structure and the installation width of the planetary carrier 5; the selected retaining ring 8 is assembled to the planetary gear 2 (the planetary gear 2 is an annular structure, the outer ring of the planetary gear 2 is provided with a rack structure meshing with the input shaft 1 and the ring gear 3, and the inner ring is provided with a circle of grooves along the circumferential direction for installing the retaining ring 8), and then the first bearing structure is assembled to the planetary gear 2; the planetary gear 2 is assembled to the planetary carrier 5 along the axial direction through the planetary shaft 4 to complete the installation of the planetary gear 2, the planetary shaft 4 and the planetary carrier 5, and this is carried out in sequence until all the planetary gears 2 and the planetary shaft 4 are assembled to the planetary carrier 5; then the planetary carrier 5 is assembled to the input shaft 1, and the oil pan 7 is fixedly installed on the axial side of the planetary carrier 5 to complete the assembly of the reducer.

[0079] In some embodiments of the present application, the first bearing structure is optimized. Specifically, Figures 2 to 4 As shown, the first bearing structure includes a retaining ring 8 fixed to the inner side of the planetary gear 2 and first bearings 9 disposed on both axial sides of the retaining ring 8 .

[0080] That is to say, in this embodiment, a planetary shaft 4, a snap ring 8 and two first bearings 9 are installed inside each planetary gear 2. The two first bearings 9 are placed on both sides of the axial direction of the snap ring 8. The snap ring 8 limits the contact between the two first bearings 9 to avoid interference between them. The first bearing 9 of this embodiment is preferably a tapered bearing, and of course other forms of bearing structures can also be used as long as they meet the requirements.

[0081] When assembling the planetary shaft 4, the first bearing 9, the snap ring 8 and the planetary gear 2, it is necessary to select the snap ring 8. The snap ring 8 has various specifications, that is, snap rings 8 of various thicknesses (referring to the thickness of the snap ring 8 in the axial direction). Select the snap ring 8 of appropriate thickness. The specific selection method is: record the installation width C1 corresponding to the planetary gear 2 on the planetary carrier 5, measure the axial widths of the two first bearings on both sides of the snap ring 8 in the axial direction of the first bearing as A1 and A2, and the optional thickness of the snap ring 8 is C1-A1-A2-a, where a is a set value, generally 0.01 mm, which is actually the allowable assembly tolerance.

[0082] In a further embodiment of the present application, the structure of the planet carrier 5 is optimized. Specifically, Figures 5 to 8 As shown, the planet carrier 5 is a hollow cavity structure, including a first side 51 close to the input shaft 1 and a second side 52 away from the input shaft 1, the first side 51 and the second side 52 are arranged axially at intervals, and mounting holes 53 corresponding to the planetary shaft 4 are opened on the first side 51 and the second side 52, and both ends of the planetary shaft 4 are passed through the mounting holes 53 to arrange the planetary gear 2 between the first side 51 and the second side 52.

[0083] The second side 52 is the power output end of the planet carrier 5, which is connected to the vehicle half shaft through a spline structure. The planet carrier 5 is a hollow structure, which is convenient for arranging structures such as the planetary gear 2 and the planetary shaft 4 in the planet carrier 5, making the arrangement of the components of the entire planetary gear more compact and occupying less space. At the same time, the hollow planet carrier 5 is also convenient for the flow of lubricating oil, and the lubricating oil can flow conveniently in the planet carrier 5, achieving the effect of wetting the bearing structure and making the rotation smoother.

[0084] A through hole for the input shaft 1 to pass through is provided in the axial middle position of the planet carrier 5 , and a through hole for the planet gear 2 to pass through is provided on the circumferential outer side of the planet carrier 5 , so that the rack structure of the planet gear 2 can pass through the planet carrier 5 and mesh with the rack structure on the ring gear 3 .

[0085] In some embodiments of the present application, the present embodiment further optimizes the structure of the planet carrier 5. In order to facilitate the flow of oil in the planet carrier 5, the present embodiment optimizes the inner structure of the first side 51 and the second side 52 of the planet carrier 5. Figure 7As shown, a plurality of first inner oil passages are provided on the side of the first side 51 facing the second side 52. The first inner oil passages are groove-shaped structures that facilitate the flow of oil. The first inner oil passages are located between two adjacent groups of mounting holes. The first inner oil passages include a plurality of first inner flow passages 511 and second inner flow passages 512. One end of the first inner flow passage 511 is located outside the circumference of the first side 51, and the other end extends in a direction parallel to the center of the mounting hole and the center of the first side input shaft through hole. One end of the second inner oil passage 512 is connected to the other end of the first inner oil passage, and the other end extends in a radial direction of the first side 51 to the input shaft through hole. A plurality of second inner oil passages are provided on the side of the second side 52 facing the first side 52, as shown. Figure 8 As shown, the second inner oil circuit is a groove-shaped structure that facilitates the flow of oil. The second inner oil circuit is located between two adjacent groups of mounting holes. The second inner oil circuit includes multiple third inner flow channels 521 and fourth inner flow channels 522; one end of the third inner flow channel 521 is located outside the circumference of the second side 52, and the other end extends in a direction parallel to the line connecting the center of the mounting hole and the center of the input shaft through the hole on the first side; one end of the fourth inner oil circuit 522 is connected to the other end of the third inner oil circuit 521, and the other end extends along the radial direction of the second side 52 to the input shaft through the hole.

[0086] The first inner oil circuit on the first side 51 and the second inner oil circuit on the second side 52 are designed to facilitate the oil entering the planetary carrier 5 to gather at the center of the planetary carrier 5 and finally enter the position where the planetary carrier 5 is connected to the input shaft 1, that is, the position of the second bearing structure, so as to facilitate cooling and lubrication of the second bearing structure.

[0087] In addition, a through hole 54 for discharging the oil in the planet carrier 5 is provided on the second side 52 of the planet carrier 5. A plurality of through holes 54 are provided on the second side 52, and the plurality of through holes 54 and the mounting holes 53 of the corresponding planet shafts 4 are evenly staggered around the axis of the input shaft 1. The through holes 54 facilitate the discharge of the oil in the planet carrier 5, so that the oil circulates in the entire reducer, reduces the resistance of the oil flowing in the planet carrier 5, and makes the oil flow smoother.

[0088] In other embodiments of the present application, the second bearing structure is optimized. Figure 2 and 4 As shown, the second bearing structure of this embodiment includes a second bearing 10 and a third bearing 11 which are disposed on both axial sides of the planetary carrier 5 and correspond to the first side 51 and the second side 52 respectively. The second bearing 10 is fixed in the axial direction between the first side 51 and the input shaft 1 by a retaining ring, and the third bearing 11 is fixed in the axial direction between the second side 52 and the input shaft 1 by a retaining ring.

[0089] The second bearing 10 and the third bearing 11 are structures for supporting the planetary carrier 5, so that the connection between the planetary carrier 5 and the input shaft 1 is more stable, and the supporting stability and running smoothness are greatly improved.

[0090] Similarly, this embodiment optimizes the design for lubrication of the second bearing 10 and the third bearing 11 , and an oil outlet for spraying oil to the second bearing 10 is provided on the housing 6 , that is, there are two oil outlets on the housing 6 , one corresponding to the oil receiving pan 7 , and the other corresponding to the second bearing 10 .

[0091] The oil corresponding to the third bearing 11 is actually part of the oil flowing out from the hole corresponding to the input shaft 1 on the second side 52. This part of the oil flows through the third bearing 11 to lubricate the third bearing 11. The outflowing oil flows back to the oil pan in the reducer, and then is transferred to the housing 6 through the oil pump to complete the circulation flow.

[0092] It also includes a fourth bearing 12 located on the side of the planet carrier 5 away from the input shaft 1. The fourth bearing 12 is a structure that facilitates the connection between the planet carrier 5 and the housing 6. The fourth bearing 12 makes the connection between the planet carrier 5 and the housing 6 more stable.

[0093] In the preferred embodiment of the present application, the structure of the oil receiving pan 7 is optimized. Specifically, Figure 2 , 4 As shown in Figures 9 and 10, the oil receiving pan 7 of the present embodiment is a hollow cavity structure fixed on the first side 51, and an oil distribution structure is arranged in the oil receiving pan 7. One end of the oil distribution structure is connected to the oil channel on the shell 6, and the other end axially passes through the first side 51 and penetrates into the interior of the planetary carrier 5.

[0094] That is to say, the oil pan 7 receives the oil sprayed from the housing 6, and then distributes it to the planet carrier 5 through the oil distribution structure. In order to more conveniently distribute the oil evenly to the structure in the planet carrier 5, it is actually mainly used to lubricate the first bearing 9. The planet shaft 4 of this embodiment is a hollow shaft-shaped structure with one side open, and the planet shaft 4 is provided with an oil outlet hole that radially connects the inner cavity of the planet shaft 4 and the outer first bearing 9.

[0095] The oil distribution structure on the oil receiving pan 7 includes a plurality of axial distribution pipes 71 arranged on the side of the oil receiving pan 7 facing the planet carrier 5. The axial distribution pipe 71 is a hollow pipe parallel to the axis of the input shaft 1. One end of the axial distribution pipe 71 is connected to the inner cavity of the oil receiving pan 7, and the other end is inserted into the planet shaft 4 from the opening side of the planet shaft 4 along the axial direction parallel to the input shaft 1. The oil entering the oil receiving pan 7 will be axially distributed into the planet shaft 4 through the axial distribution pipe 71. The oil entering the planet shaft 4 will be discharged to the outside of the planet shaft 4 along the oil outlet hole on the planet shaft 4 under the action of centrifugation, and enter the first bearing 9 on the outside to provide lubricating oil for the operation of the first bearing 9. The outlet end of the axial distribution pipe 71 is spaced apart from the oil outlet hole in the axial direction, which can be set to 3 mm to 5 mm, that is, the axial distribution pipe 71 does not overlap with the oil outlet hole in the axial direction. This arrangement facilitates the oil to enter the planetary shaft 4 from the axial distribution pipe 71, and the oil flows more smoothly in the planetary shaft 4, and is more convenient to discharge from the oil outlet hole, which has a better distribution effect on the oil.

[0096] In this embodiment, a plurality of axial distribution pipes 71 are arranged on the oil receiving pan 7. In fact, the axial distribution pipes 71 correspond to the planetary shafts 4 one by one. In this embodiment, there are three planetary gears 2 and three planetary shafts 4, so naturally there are three axial distribution pipes 71. The three axial distribution pipes 71 are arranged at equal intervals along the circumferential direction with the axis of the oil receiving pan 7 as the center. The evenly distributed axial distribution pipes 71 are not only for matching the arrangement of the planetary shafts 4, but also for evenly discharging the oil in the oil receiving pan 7 into the planetary carrier 5.

[0097] In order to further facilitate the oil in the inner cavity of the oil receiving pan 7 to enter the axial distribution pipe 71, in this embodiment, a plurality of oil retaining ribs 72 are arranged in the oil receiving pan 7, and the oil retaining ribs 72 correspond to the axial distribution pipe 71 one by one. The oil retaining ribs 72 are raised ribs arranged in the inner cavity of the oil receiving pan 7 to prevent the circumferential flow of the oil so that the oil enters the axial distribution pipe 71. The oil retaining ribs 72 actually isolate the inner cavity of the oil receiving pan 7, so that the original annular inner cavity in the oil receiving pan forms a plurality of independent chambers, each of which corresponds to an axial distribution pipe 71, and the oil entering the independent chamber can enter the axial distribution pipe 71 more conveniently.

[0098] In addition, the oil retaining rib 72 of this embodiment is located on the side of the corresponding axial distribution pipe 71 along the rotation direction of the oil receiving pan 7, and the oil retaining rib 72 is arranged obliquely along the radial direction of the oil receiving pan 7. The end of the oil retaining rib 72 close to the center of the oil receiving pan 7 is in front of the end of the oil retaining rib 72 away from the center of the oil receiving pan 7 along the rotation direction of the oil receiving pan 7. The oil retaining rib 72 arranged obliquely along the radial direction can form an inclined surface structure at the axial distribution pipe 71. During the rotation of the oil receiving pan 7, the oil will gather at the oil retaining rib 72 under the action of centrifugal force. It happens that the oil retaining rib 72 of this embodiment is located on the side of the corresponding axial distribution pipe 71 along the rotation direction of the oil receiving pan 7, so that the oil can enter the axial distribution pipe 71 more conveniently, and the oil entering the axial distribution pipe 71 can be more fully discharged into the planetary shaft 4.

[0099] Therefore, the flow mode of the oil in the oil receiving pan 7 of the present embodiment is as follows: after the oil enters the internal cavity of the oil receiving pan 7, the oil receiving pan 7 rotates with the planetary carrier 5, and under the action of centrifugal force, the oil will gather at the position of the oil retaining rib 72, and the gathered oil will enter the axial distribution pipe 71 corresponding to the oil retaining rib 72, and finally be discharged from the outlet of the axial distribution pipe 71 into the planetary shaft 4. Under the action of the centrifugal force of the planetary shaft 4, the oil entering the planetary shaft 4 will be discharged between the two first bearings 9 through the oil outlet holes on the planetary shaft 4, and then dispersed to both sides along the axial direction to fully soak the first bearing 9, thereby achieving a good cooling and lubrication effect.

[0100] In other embodiments of the present application, the above-mentioned housing structure is optimized. Specifically, Figure 4 As shown, the housing 6 includes a first portion 61 on the side of the planet carrier 5 provided with the oil receiving pan 7 and a second portion 62 on the side of the planet carrier 5 opposite to the oil receiving pan 7. The oil channel in the housing 6 includes a first oil channel 63 provided in the first portion 61. The first oil channel 63 includes an inlet connected to the oil pump, a first outlet for spraying oil to the oil receiving pan 7, and a second outlet for spraying oil to the second bearing 10 in the second bearing structure. The oil channel in the housing 6 includes a second oil channel 64 provided in the second portion 62. The second oil channel 64 includes an inlet connected to the oil pump, a third outlet for spraying oil to the planet carrier 5, and a fourth outlet for spraying oil to the fourth bearing 12 in the second bearing structure.

[0101] The housing 6 of this embodiment sprays oil to the planet carrier 5 from both sides of the planet carrier 5. The first oil channel 63 and the second oil channel 64 both have two outlets, corresponding to the oil receiving pan 7, the second bearing 10, the planet carrier 5 and the fourth bearing 12 respectively. The first bearing 9 of this embodiment is sprayed with oil for lubrication and cooling through the oil outlet hole on the planet shaft 4. The third bearing 11 of this embodiment is located between the second side 52 and the input shaft 1. Part of the oil of the planet carrier 5 is discharged to the outside of the planet carrier 5 through this position, so the third bearing 11 is always in the oil. The oil discharged from the third bearing 11 will flow back through the input shaft 1, such as Figure 4 As shown, an axially arranged connecting channel is provided in the input shaft 1 , the inlet end of the connecting channel is communicated with one side of the third bearing 11 , and the outlet end is located at a side of the first part away from the oil receiving pan 7 .

[0102] The oil flow process of this embodiment is as follows Figure 4 As shown, the oil pump pumps the oil in the oil pan into the housing 6, and the oil pumped into the housing 6 is divided into two directions, one is to enter the first part 61, and the other is to enter the second part 62; the oil entering the first part 61 flows in the first part 61 through the first oil channel 63, a part of it is discharged into the oil receiving pan 7 through the first outlet, and the other part is directly sprayed onto the second bearing 10 through the second outlet; after the oil enters the internal cavity of the oil receiving pan 7, the oil receiving pan 7 rotates with the planetary carrier 5, and under the action of centrifugal force, the oil will gather at the position of the oil retaining rib 72, and the gathered oil will enter the axial distribution pipe 71 corresponding to the oil retaining rib 72, and finally be discharged from the outlet of the axial distribution pipe 71 into the planetary shaft 4, and the oil entering the planetary shaft 4 is discharged from the planetary shaft 4 Under the action of centrifugal force, the oil will be discharged between the two first bearings 9 through the oil outlet hole on the planetary shaft 4, and then dispersed to both sides along the axial direction to fully infiltrate the first bearing 9; another part of the oil directly sprayed to the second bearing 10 through the second outlet will finally enter the planetary carrier 5, and the oil sprayed into the planetary carrier 5 through the oil receiving pan 7 will finally flow to the first side 51 and the second side 52, and the oil flowing to the first side 51 and the second side 52 will be gathered in the first inner oil passage and the second inner oil passage to the center position of the planetary carrier 5, and the gathered oil will be discharged to the outside of the planetary carrier 5 through the third bearing 11; the oil discharged from the planetary carrier 5 will finally enter the connecting channel of the input shaft 1, and the oil will move axially in the connecting channel to the side of the first side 51 away from the second side 52, and finally flow back to the oil pan;

[0103] The oil entering the second portion 62 will flow in the second oil channel 64, part of the oil will enter the planet carrier 5 through the third outlet and the through hole 54, and the other part will be directly sprayed to the fourth bearing 12 to lubricate and cool the fourth bearing 12, and finally flow back to the oil pan;

[0104] Complete the entire oil circuit cycle.

[0105] When the reducer of the present application is actually assembled: based on the axial width of the first bearing structure and the installation width of the planet carrier 5, the corresponding snap ring 8 is selected, the installation width C1 of the corresponding planetary gear 2 on the planet carrier 5 is recorded, the axial widths of the two first bearings on both sides of the axial direction of the snap ring 8 in the first bearing are measured as A1 and A2, and the thickness of the snap ring 8 can be selected as C1-A1-A2-a; the selected snap ring 8 is assembled to the planetary gear 2, and then the two first bearings 9 are assembled into the planetary gear 2 from both sides of the snap ring 8; the planetary gear 2 equipped with the first bearing 9 is assembled. The planetary gear 2 is placed in the planetary carrier 5, so that the inner ring of the first bearing 9, the planetary gear 2 and the corresponding mounting hole 53 on the planetary carrier 5 are coaxial, and the guide pin is inserted into the mounting hole 53 and the inner ring of the first bearing 9, and then the planetary shaft 4 to be assembled is pressed into the mounting hole 53 of the planetary carrier 5 along the axial direction through interference until the guide pin is completely expelled, and the installation of the planetary shaft 4, planetary gear 2 and planetary carrier 5 is completed; this is carried out in sequence until all the planetary gears 2 and planetary shafts 4 are assembled on the planetary carrier 5; then the planetary carrier 5 is assembled on the input shaft 1 to complete the assembly of the reducer.

[0106] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application to be protected. The scope of protection claimed in the present application is defined by the attached claims and their equivalents.

Claims

1. A lubrication structure for a planetary gear reducer for coaxial distributed drive, characterized in that: include, Housing (6); An input shaft (1), one end of the input shaft (1) being connected to a power output device; A gear ring (3), wherein the gear ring (3) is an annular structure fixed on the housing (6); A plurality of planetary gears (2), the plurality of planetary gears (2) being arranged at intervals along the circumference of the input shaft (1) with the axis of the input shaft (1) as the center, the planetary gears (2) being meshed with the input shaft (1) for transmission connection and driven by the input shaft (1) to revolve around the axis of the input shaft (1), the planetary gears (2) being meshed with the ring gear (3) and rotating around their own axes while revolving; A plurality of planetary shafts (4), one end of each planetary shaft (4) is arranged along an axis parallel to the input shaft (1) and penetrates the planetary gear (2), and is connected to the planetary gear (2) via a first bearing structure so as to be rotatable around its own axis, and the planetary shaft (4) and the planetary gear (2) are arranged coaxially; A planet carrier (5), wherein the planet carrier (5) is sleeved on the input shaft (1) and can rotate around the axis of the input shaft (1) via a second bearing structure, and the planet carrier (5) and the other end of the planet shaft (4) are fixedly connected in a direction of rotation around the axis of the input shaft (1); An oil receiving pan (7) is fixed on one axial side of the planet carrier (5) and is used to evenly distribute the oil sprayed from the oil channel of the housing to the planet carrier (5), the planetary gear (2), the planetary shaft (4) and the first bearing structure along the axial direction.

2. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 1, characterized in that: The planet carrier (5) is a hollow cavity structure, comprising a first side (51) close to the input shaft (1) and a second side (52) away from the input shaft (1); the first side (51) and the second side (52) are arranged at intervals along the axial direction, and mounting holes (53) corresponding to the planet shafts (4) are opened on the first side (51) and the second side (52); both ends of the planet shaft (4) are passed through the mounting holes (53) to arrange the planet gears (2) between the first side (51) and the second side (52).

3. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 2, characterized in that: The oil receiving pan (7) is a hollow cavity structure fixed to the first side (51) by a bolt structure, and an oil distribution structure is arranged in the oil receiving pan (7); one end of the oil distribution structure is connected to the oil channel on the shell (6), and the other end axially passes through the first side (51) and penetrates into the interior of the planet carrier (5).

4. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 3, characterized in that: The oil distribution structure comprises an axial distribution pipe (71) arranged on the side of the oil receiving pan (7) facing the planet carrier (5); the axial distribution pipe (71) is a hollow tubular structure with two ends open, one end of the axial distribution pipe (71) is connected to the inner cavity of the oil receiving pan (7), and the other end axially passes through the first side (51) and extends into the interior of the planet carrier (5).

5. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 4, characterized in that: The oil receiving pan (7) is provided with a plurality of axial distribution pipes (71), and the plurality of axial distribution pipes (71) are arranged at equal intervals along the circumferential direction of the oil receiving pan (7) with the axis of the oil receiving pan (7) as the center.

6. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 5, characterized in that: A plurality of oil-blocking ribs (72) are arranged in the oil receiving pan (7); the oil-blocking ribs (72) correspond one to one with the axial distribution pipes (71); the oil-blocking ribs (72) are raised ribs arranged in the inner cavity of the oil receiving pan (7) and used to block the circumferential flow of oil and allow the oil to enter the axial distribution pipe (71).

7. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 6, characterized in that: The oil retaining rib (72) is located on one side of the corresponding axial distribution pipe (71) along the rotation direction of the oil receiving pan (7).

8. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 7, characterized in that: The oil baffle rib (72) is arranged obliquely along the radial direction of the oil receiving pan (7), and one end of the oil baffle rib (72) close to the center of the oil receiving pan (7) is located in front of one end of the oil baffle rib (72) away from the center of the oil receiving pan (7) along the rotation direction of the oil receiving pan (7).

9. The lubrication structure of a planetary gear reducer for coaxial distributed drive according to any one of claims 5 to 8, characterized in that: The planetary shaft (4) is a hollow shaft-shaped structure with one side open, and an oil outlet hole is provided on the planetary shaft (4) to radially connect the inner cavity of the planetary shaft (4) and the outer first bearing (9); the end of the axial distribution pipe (71) away from the oil receiving pan (7) extends axially into the planetary shaft (4).

10. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 9, characterized in that: The axial distribution pipe (71) and the oil outlet hole do not overlap in the axial direction of the planetary shaft (4).

11. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 10, characterized in that: The first bearing structure comprises a retaining ring (8) fixed to the inner side of the planetary gear and first bearings (9) disposed on both axial sides of the retaining ring (8); the oil outlet hole is located between the two groups of first bearings (9) in the axial direction of the planetary shaft (4).

12. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 2, characterized in that: A plurality of first inner oil passages are arranged on the side of the first side (51) facing the second side (52); the first inner oil passage is a groove-shaped structure for facilitating the flow of oil, the first inner oil passage is located between two adjacent groups of mounting holes, and the first inner oil passage comprises a plurality of first inner flow passages (511) and second inner flow passages (512); one end of the first inner flow passage (511) is located outside the circumference of the first side (51), and the other end extends in a direction parallel to a line connecting the center of the mounting hole and the center of the first side input shaft through hole; one end of the second inner oil passage (512) is connected to the other end of the first inner oil passage (511), and the other end extends in a radial direction of the first side (51) to the input shaft through hole.

13. The lubrication structure of a planetary gear reducer for coaxial distributed drive according to claim 2, characterized in that: A plurality of second inner oil passages are arranged on the side of the second side (52) facing the first side (52); the second inner oil passage is a groove-shaped structure for facilitating the flow of oil, the second inner oil passage is located between two adjacent groups of mounting holes, and the second inner oil passage comprises a plurality of third inner flow passages (521) and a fourth inner flow passage (522); one end of the third inner flow passage (521) is located outside the circumference of the second side (52), and the other end extends in a direction parallel to a line connecting the center of the mounting hole and the center of the input shaft through hole on the first side; one end of the fourth inner oil passage (522) is connected to the other end of the third inner oil passage (521), and the other end extends in a radial direction of the second side (52) to the input shaft through hole.

14. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 2, characterized in that: The second side (52) is provided with a through hole (54) for discharging oil in the planet carrier (5).

15. The lubrication structure of a planetary gear reducer for coaxial distributed drive according to claim 14, characterized in that: A plurality of through holes (54) are provided on the second side (52), and the plurality of through holes (54) and the mounting holes (53) of the corresponding planetary shafts (4) are evenly staggered and arranged with the axis of the input shaft (1) as the center.

16. The lubrication structure of a planetary gear reducer for coaxial distributed drive according to claim 1, characterized in that: The housing (6) comprises a first portion located on a side of the planetary carrier (5) provided with an oil receiving pan (7) and a second portion located on a side of the planetary carrier (5) opposite to the oil receiving pan (7); the oil channel in the housing (6) comprises a first oil channel provided in the first portion; the first oil channel comprises an inlet connected to an oil pump, a first outlet for spraying oil toward the oil receiving pan (7), and a second outlet for spraying oil toward a second bearing (10) in a second bearing structure.

17. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 16, characterized in that: The oil channel in the housing (6) includes a second oil channel arranged in the second part; the second oil channel includes an inlet connected to the oil pump, a third outlet for spraying oil to the planetary carrier (5), and a fourth outlet for spraying oil to the fourth bearing (12) in the second bearing structure.

18. A lubrication structure for a planetary gear reducer for coaxial distributed drive according to claim 16 or 17, characterized in that: The input shaft (1) is provided with an axially arranged connecting channel; the inlet end of the connecting channel is connected to a side of the third bearing (11) in the second bearing structure that is away from the oil receiving pan (7), and the outlet end is located on a side of the first part that is away from the oil receiving pan (7).

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