Planetary reducer and electric drive assembly

Abstract

The planetary reducer comprises a planet carrier, a planet wheel, a planet wheel shaft and an output flange, the planet carrier comprises a left side plate and a right side plate which are oppositely arranged, a plurality of fixing tables are connected between the left side plate and the right side plate, and the fixing tables are arranged at intervals in the circumferential direction; the planet wheel is arranged between the left side plate and the right side plate and is located in a space between every two adjacent fixing tables; one end of the planet wheel shaft sequentially penetrates through the left side plate and the planet wheel until the end of the planet wheel shaft abuts against the right side plate; and the output flange is fixed on the left side plate and tightly presses the other end of the planet wheel shaft. The planet wheel shaft is pressed and fixed through the output flange on one side of the planet carrier, axial constraint on the planet wheel shaft can be achieved, the technology of riveting the planet wheel shaft is not needed, power of the planet carrier can be transmitted out, assembling is easy, and efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a planetary reducer and an electric drive assembly. Background Technique

[0002] In the traditional assembly process of a planetary reducer, when assembling the planetary gears, it is necessary to first install the needle roller bearings inside the planetary gears in place to ensure that the planetary gears can rotate smoothly around their axes, and then the planetary gears are successively installed into the planet carrier and connected to the planetary gear shafts. To ensure the stability of the operation of the planetary gears, it is usually necessary to rivet and fix the planetary gear shafts to prevent the planetary gear shafts from loosening as the planetary gears move together. However, this riveting method is complex in operation, low in efficiency, and prone to missed riveting or the riveting dimensions not meeting the requirements, resulting in the detachment of the planetary gear shafts during use. Content of the Utility Model

[0003] Based on this, the purpose of the utility model is to provide a planetary reducer and an electric drive assembly to solve the technical problems mentioned in the above background technique.

[0004] The utility model on the one hand proposes a planetary reducer, comprising:

[0005] A planet carrier, the planet carrier includes a left side plate and a right side plate arranged oppositely, and a plurality of fixing platforms are connected between the left side plate and the right side plate, and the plurality of fixing platforms are arranged at intervals in the circumferential direction;

[0006] Planetary gears, the planetary gears are arranged between the left side plate and the right side plate and are located in the space between two adjacent fixing platforms;

[0007] A planetary gear shaft, one end of the planetary gear shaft sequentially penetrates the left side plate and the planetary gear until it abuts against the right side plate;

[0008] An output flange, the output flange is fixed on the left side plate and presses the other end of the planetary gear shaft.

[0009] Further, in the planetary reducer, through first shaft holes are provided at the center points of the left side plate and the right side plate, a plurality of second shaft holes surrounding the first shaft hole are provided on the left side plate, a counterbore corresponding to the second shaft hole is provided on the right side plate, and one end of the planetary gear shaft is inserted from the second shaft hole until it is fitted into the counterbore.

[0010] Further, for the planetary speed reducer, the output flange includes a flange plate and a spline transmission shaft provided on one side of the flange plate. A plurality of mounting holes surrounding the spline transmission shaft are formed on the flange plate. Threaded holes penetrating the fixed platform are provided on the left side plate, and the threaded holes are arranged in one-to-one correspondence with the mounting holes. The mounting holes are used to penetrate first bolts to connect the threaded holes, thereby realizing the assembly of the output flange on the planet carrier.

[0011] Further, for the planetary speed reducer, a ring groove surrounding the first shaft hole is provided on the left side plate, and the ring groove extends along a plurality of the second shaft holes. A plurality of bayonet openings are provided on the periphery of one end of the planet wheel shaft located on the flange plate. A ring rib aligned with the ring groove is provided on the surface of the flange plate facing the left side plate. When the output flange is connected to the left side plate, the ring rib cooperates with the ring groove and at least two of the bayonet openings of each planet wheel shaft, thereby restricting the rotation of the planet wheel shaft.

[0012] Further, for the planetary speed reducer, the planet wheel is rotationally and fittingly connected to the planet wheel shaft through a first bearing. An oil collecting groove is formed by recessing one end of the planet wheel shaft located on the output flange. A plurality of first oil holes corresponding to the first bearing are formed on the inner wall of the oil collecting groove. A second oil hole aligned with the oil collecting groove is formed on the flange plate.

[0013] Further, for the planetary speed reducer, an oil collecting ring corresponding to the second oil hole is provided on the surface of the flange plate facing away from the left side plate.

[0014] Further, for the planetary speed reducer, the oil collecting ring includes a vertical portion connected to the flange plate. One end of the vertical portion away from the flange plate extends horizontally inward with a horizontal portion, and the orthographic projection of the horizontal portion on the flange plate coincides with the second oil hole.

[0015] Further, for the planetary speed reducer, an oil guiding groove is provided on the left side plate. One end of the oil guiding groove communicates with the first shaft hole, and the other end communicates with the second shaft hole. At least one of the bayonet openings on the planet wheel shaft corresponds to the oil guiding groove.

[0016] Further, for the planetary speed reducer, the bottom of the oil collecting groove is conical.

[0017] On the other hand, the present utility model further provides an electric drive assembly, including the planetary speed reducer described in the above technical solution.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] By pressing and fixing the planet gear shaft through the output flange on one side of the planet carrier, axial constraint of the planet gear shaft can be achieved. There is no need for the riveting process of the planet gear shaft, and the power of the planet carrier can also be transmitted. The assembly is simple and efficient. Brief Description of the Drawings

[0020] Figure 1 It is a cross-sectional view of the planetary reducer in the present utility model;

[0021] Figure 2 It is an exploded view of the planetary reducer in the present utility model;

[0022] Figure 3 It is a schematic diagram of the internal structure of the planetary reducer in the present utility model;

[0023] Figure 4 is Figure 2 a partially enlarged schematic view of position A in;

[0024] Figure 5 is Figure 1 a partially enlarged schematic view of position B in;

[0025] Figure 6 It is an exploded view of the planet carrier and the input shaft in the present utility model;

[0026] Figure 7 It is a specific structural schematic diagram of the output flange in the present utility model;

[0027] Main Component Symbol Explanation:

[0028] 10. Reducer Rear Shell; 11. Base Plate; 12. Reducer Side Plate;

[0029] 20. Planetary Reduction Gear Set; 21. Planet Carrier; 211. Left Side Plate; 212. Right Side Plate; 213. Fixed Table; 214. Planet Gear; 22. Counting Tooth; 23. Rotation Speed Sensor;

[0030] 24. Output Flange; 241. Flange Disk; 242. Spline Transmission Shaft; 243. Mounting Hole; 244. Threaded Hole; 245. First Bolt;

[0031] 251. First Shaft Hole; 252. Second Shaft Hole; 253. Sunk Groove; 254. Planet Gear Shaft; 255. First Bearing; 256. Hollow Hole;

[0032] 261. Oil Sump; 262. First Oil Hole; 263. Second Oil Hole; 264. Oil Collection Ring; 2641. Vertical Portion; 2642. Horizontal Portion;

[0033] 271. Ring Groove; 272. Bayonet; 273. Ring Rib; 274. Oil Guide Groove;

[0034] 281. Step; 282. Ring gear; 283. Input shaft; 284. Sun gear; 285. Locking tooth; 286. Tooth groove;

[0035] 291. Bush; 292. Second bearing; 293. Third bearing; 294. First bearing chamber; 295. Second bearing chamber;

[0036] 30. Front housing of the reducer; 31. Top plate; 32. Mounting flat plate; 33. Second bolt;

[0037] 41. Fourth bearing; 42. Fifth bearing; 43. First shaft shoulder; 44. Second shaft shoulder; 45. Limit stop; 451. Screw part; 452. Flap part; 46. Third shaft shoulder; 47. First retaining ring; 48. Second retaining ring; 49. Fourth shaft shoulder;

[0038] 51. Inner side plate of the motor; 52. Outer side plate of the motor; 53. Sub-housing of the motor; 54. Output shaft; 55. Motor rotor; 56. Motor stator.

[0039] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0040] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] The first embodiment

[0044] Please refer to Figures 1 to 7, the planetary reducer in the first embodiment of the present utility model includes a bottom plate 11 and a reducer side plate 12 provided on one side of the bottom plate 11. The inner side of the reducer side plate 12 forms a part of the reducer chamber, and a planetary reduction gear set 20 is installed in the reducer chamber;

[0045] Among them, the planetary reduction gear set 20 includes a planet carrier 21, planet gears 214, planet gear shafts 254 and an output flange 24. The planet carrier 21 includes a left side plate 211 and a right side plate 212 arranged oppositely. A plurality of fixed platforms 213 are connected between the left side plate 211 and the right side plate 212, and the plurality of fixed platforms 213 are arranged at intervals in the circumferential direction; the planet gears 214 are arranged between the left side plate 211 and the right side plate 212 and are located in the space between two adjacent fixed platforms 213; one end of the planet gear shaft 254 sequentially penetrates the left side plate 211 and the planet gear 214 until it abuts against the right side plate 212; the output flange 24 is fixed on the left side plate 211 and presses the other end of the planet gear shaft 254.

[0046] By pressing and fixing the planet gear shaft 254 through the output flange 24 on one side of the planet carrier 21, the axial constraint of the planet gear shaft 254 can be realized. There is no need for the process of riveting the planet gear shaft 254, and the power of the planet carrier 21 can also be transmitted. The assembly is simple and the efficiency is high.

[0047] Refer to Figure 3 , a plurality of counting teeth 22 are distributed at intervals on the outer peripheral edge of the planet carrier 21. A speed sensor 23 is provided on the reducer side plate 12, and the measuring end of the speed sensor 23 extends into the reducer chamber and corresponds to the counting teeth 22.

[0048] In this embodiment, the counting teeth 22 are integrally formed with the planet carrier 21 by casting, that is, the speed measuring gear and the planet carrier 21 are combined into one, eliminating the assembly steps of the speed measuring gear, and at the same time reducing the space occupied by the measuring gear in the reducer chamber, which is beneficial to the overall small-size structural design of the reducer.

[0049] The working principle of the speed sensor 23 is as follows: The counting teeth 22 are integrally formed with the planet carrier 21. When the planet carrier 21 rotates, the speed sensor 23 can measure the rotation frequency of the counting teeth 22 on the planet carrier 21. The rotation speed of the planet carrier 21 can be calculated through the frequency of the counting teeth 22 passing through the speed sensor 23 and the number of teeth of the counting teeth 22 on the planet carrier 21, so as to obtain the rotation speed of the reducer.

[0050] In this embodiment, the bottom plate 11 and the reducer side plate 12 together form the rear housing 10 of the reducer. The planetary reducer further includes a front housing 30 of the reducer that is integrally spliced with the rear housing 10 of the reducer. The planetary reduction gear set 20 is disposed between the front housing 30 and the rear housing 10 of the reducer. Specifically, the front housing 30 of the reducer is composed of a top plate 31 and an installation flat plate 32 provided at the periphery of the top plate 31. The top plate 31 arches relative to the installation flat plate 32, thereby forming another part of the reducer chamber. The installation flat plate 32 can be connected to the reducer side plate 12 through the second bolt 33 to realize the assembly of the front housing 30 and the rear housing 10 of the reducer.

[0051] Referring to Figure 3 and Figure 6 , the counting teeth 22 are integrally formed on the periphery of the left side plate 211 or the right side plate 212. In this embodiment, the counting teeth 22 are integrally formed on the periphery of the right side plate 212, and the number of the fixed platforms 213 is 3. Therefore, 3 planetary gears 214 are rotatably provided on the planet carrier 21. Of course, in practical applications, the numbers of the fixed platforms 213 and the planetary gears 214 can be adjusted as required. This embodiment is only an example rather than a limitation.

[0052] Furthermore, the output flange 24 is made of steel, and the planet carrier 21 is made of cast iron. It can be understood that the planet carrier 21 with a complex structure is made of cast iron, which can accurately form the structure of the counting teeth 22 to ensure the accuracy of the rotational speed sensor 23 in measuring the rotational speed of the planet carrier 21. The output flange 24 that bears a large load is made of steel. The two are made of different materials, realizing a reasonable division of labor, giving full play to the advantages of their respective materials, and also reducing the overall manufacturing difficulty and cost.

[0053] In this embodiment, the output flange 24 and the planet carrier 21 are fixedly connected through the first bolt 245. Specifically, referring to Figure 6 , the output flange 24 includes a flange plate 241 and a spline transmission shaft 242 provided on one side of the flange plate 241. A plurality of mounting holes 243 surrounding the spline transmission shaft 242 are formed on the flange plate 241. Threaded holes 244 penetrating the fixed platforms 213 are provided on the left side plate 211. The threaded holes 244 and the mounting holes 243 are arranged in one-to-one correspondence. Therefore, by passing the first bolt 245 through the mounting holes 243 to connect the threaded holes 244, the assembly of the output flange 24 on the planet carrier 21 can be realized.

[0054] Referring to Figures 2 to 4, through holes of the first shaft holes 251 are provided at the center points of the left side plate 211 and the right side plate 212. The first shaft holes 251 are used for the input shaft 283 of the speed reducer to pass through. A plurality of second shaft holes 252 surrounding the first shaft holes 251 are provided on the left side plate 211. The second shaft holes 252 are located in the area between two adjacent fixing platforms 213. A counterbore 253 corresponding to the second shaft holes 252 is provided on the right side plate 212. One end of the planet gear shaft 254 is inserted from the second shaft holes 252 until it is fitted into the counterbore 253. The planet gear 214 is rotationally and fittingly connected to the planet gear shaft 254 through a first bearing 255.

[0055] The assembly steps of the planet gear 214 are as follows. First, insert the planet gear 214 and the first bearing 255 from the side of the planet carrier 21 and adjust the position to ensure that the inner ring of the first bearing 255 is aligned with the second shaft holes 252. Then, insert the planet gear shaft 254 from the second shaft holes 252 and pass through the inner ring of the first bearing 255 until it abuts against the counterbore 253 on the right side plate 212. Repeat the above steps until all the planet gears 214 are assembled. Then, install the output flange 24. The flange 241 of the output flange 24 presses the planet gear shaft 254 against the counterbore 253 to achieve axial restraint. It can be seen that in this embodiment, the fixing of the planet gear shaft 254 no longer requires a riveting process. It can be achieved by pressing with the flange 241 of the output flange 24, which not only simplifies the assembly process but also reduces the assembly cost.

[0056] It should be noted that in this embodiment, the first bearing 255 includes but is not limited to a needle bearing, and can be adjusted as required specifically.

[0057] Furthermore, a hollow hole 256 is provided at the position corresponding to the counterbore 253 on the right side plate 212. The design of the hollow hole 256 aims to achieve a lightweight structural design, reduce the overall weight of the speed reducer. At the same time, through the hollow design, the amount of material used can be reduced on the premise of ensuring the structural strength and rigidity, thereby saving material costs.

[0058] Refer to Figure 4 , an oil collecting groove 261 is formed by recessing at one end of the planet gear shaft 254 located at the output flange 24. A plurality of first oil holes 262 corresponding to the first bearing 255 are provided on the inner wall of the oil collecting groove 261. A second oil hole 263 aligned with the oil collecting groove 261 is provided on the flange 241. An oil collecting ring 264 corresponding to the second oil hole 263 is provided on the side of the flange 241 facing away from the left side plate 211.

[0059] In practical applications, when the speed reducer is operating normally, the oil collecting ring 264 can collect part of the oil in the speed reducer chamber and guide the oil through the second oil hole 263 into the oil collecting groove 261 of the planetary gear shaft 254, and then discharge it through the first oil hole 262 to lubricate the first bearing 255. Among them, the oil collecting ring 264 can be set as required, and this embodiment is only an example rather than a limitation.

[0060] Specifically, in this embodiment, the oil collecting ring 264 is integrally formed on the flange 241, replacing the traditional oil baffle part and eliminating the assembly. The oil collecting ring 264 includes a vertical portion 2641 connected to the flange 241. One end of the vertical portion 2641 away from the flange 241 extends horizontally inward with a horizontal portion 2642. The orthographic projection of the horizontal portion 2642 on the flange 241 coincides with the second oil hole 263. It can be understood that when the speed reducer is working, the oil splashed in its chamber can be collected inside the oil collecting ring 264 and thus guided into the second oil hole 263.

[0061] Furthermore, the bottom of the oil collecting groove 261 is conical, which is conducive to the outward discharge of the oil in the oil collecting groove 261 and can reduce the accumulation of oil in the oil collecting groove 261 to a certain extent.

[0062] Refer to Figure 3 , a ring groove 271 is provided on the left side plate 211 around the first shaft hole 251. The ring groove 271 extends along multiple second shaft holes 252. A plurality of bayonets 272 are provided on the periphery of one end of the planetary gear shaft 254 located on the flange 241. A ring rib 273 aligned with the ring groove 271 is provided on the surface of the flange 241 facing the left side plate 211. When the output flange 24 is connected to the left side plate 211, the ring rib 273 cooperates with the ring groove 271 and at least two bayonets 272 of each planetary gear shaft 254 to limit the rotation of the planetary gear shaft 254.

[0063] Refer to Figure 3 , the mounting holes 243 are distributed inside and outside the ring rib 273. Thus, when the output flange 24 is connected to the left side plate 211, the first bolt 245 can provide a more stable fixing effect on the ring rib 273. Among them, the fixing platform 213 is adjusted adaptively according to the number of mounting holes 243.

[0064] Further, an oil guide groove 274 is provided on the left side plate 211. One end of the oil guide groove 274 communicates with the first shaft hole 251, and the other end communicates with the second shaft hole 252. At least one of the bayonets 272 on the planetary gear shaft 254 corresponds to the oil guide groove 274. It can be understood that by providing the oil guide groove 274, the oil in the oil sump 261 not only leads out the roller first bearing 255 through the first oil hole 262, but also enters the oil guide groove 274 through the bayonet 272, and then enters the first shaft hole 251 under the guidance of the oil guide groove 274, so as to lubricate the relevant bearings on the input shaft 283.

[0065] Specifically, referring to Figure 2 and Figure 3 , a step 281 is provided on the inner side of the reducer side plate 12. A ring gear 282 is supported on the step 281. The ring gear 282 meshes with the planetary gear 214. An input shaft 283 is provided at the central axis of the planet carrier 21. A sun gear 284 meshing with the planetary gear 214 is provided on the outer wall of the input shaft 283.

[0066] In practical applications, the input shaft 283 is driven to rotate by a motor, so that the sun gear 284 drives the planetary gear 214 to rotate. At the same time, the planetary gear 214 meshes with the ring gear 282. The planetary gear 214 rotates around its own axis while also revolving. Finally, the power is output by the planet carrier 21.

[0067] Further, a plurality of teeth 285 are annularly arranged on the outer edge of the ring gear 282. A tooth groove 286 cooperating with the teeth 285 is provided on the inner side of the reducer side plate 12. The teeth 285 are in clearance fit with the tooth groove 286 in the radial direction, and the ring gear 282 is in clearance fit between the mounting plate 32 and the step 281 in the axial direction. This design enables the ring gear 282 to have a small floating amount both in the radial direction and in the axial direction when assembled with the reducer side plate 12, which is beneficial to uniform load distribution and smooth meshing.

[0068] Referring to Figure 2 and Figure 6 , a bushing 291 coaxial with the spline transmission shaft 242 is provided on the right side plate 212. A second bearing 292 is sleeved on the bushing 291. A third bearing 293 is sleeved on the spline transmission shaft 242. A first bearing chamber 294 cooperating with the second bearing 292 is recessed on the bottom plate 11. A second bearing chamber 295 cooperating with the third bearing 293 is provided on the inner side of the top plate 31.

[0069] It should be noted that in this embodiment, the bushing 291 is a part of the planet carrier 21 and is integrally cast with the planet carrier 21. When the output flange 24 and the planet carrier 21 are assembled into a whole, by respectively arranging a second bearing 292 and a third bearing 293 at both ends of this whole, the two-way support of this whole is realized. Compared with the traditional single-bearing cantilever support method, the planet carrier 21 and the output flange 24 in this embodiment have better stability when rotating.

[0070] Furthermore, in this embodiment, both the second bearing 292 and the third bearing 293 are preferably single-row tapered roller bearings, so they can bear a certain axial force and increase the axial load of the output flange 24.

[0071] Refer to Figure 1 、 Figure 5 and Figure 6 As shown, a fourth bearing 41 and a fifth bearing 42 are sleeved on the input shaft 283. The fourth bearing 41 and the fifth bearing 42 are respectively located on both sides of the sun gear 284. Among them, the fourth bearing 41 is clamped between the output flange 24 and the left side plate 211, and the fifth bearing 42 is clamped inside the bushing 291. It can be seen that in this embodiment, the input shaft 283 is supported at both ends by the fourth bearing 41 and the fifth bearing 42. Compared with the traditional single-bearing cantilever support of the sun gear 284 of the planetary gear set, the stiffness and strength of the input shaft 283 are better. Secondly, the input shaft 283 and the output flange 24 are directly centered by the inner and outer diameters of the fourth bearing 41, without other auxiliary structures or parts such as pin holes and pin shafts, and have higher precision and better concentricity.

[0072] Specifically, a first shaft shoulder 43 is provided on the inner wall of the first shaft hole 251 of the left side plate 211, a second shaft shoulder 44 corresponding to the first shaft shoulder 43 is provided on the inner wall of the spline transmission shaft 242, a limiting stop member 45 is provided at the outer end of the input shaft 283. The outer ring of the fourth bearing 41 is pressed between the first shaft shoulder 43 and the second shaft shoulder 44, and the inner ring of the fourth bearing 41 is pressed between the limiting stop member 45 and the sun gear 284, without the need for additional parts such as snap rings or bearing retaining plates to restrict the axial movement of the fourth bearing 41, saving space and reducing the manufacturing cost at the same time.

[0073] On the inner wall of the first shaft hole 251 of the right side plate 212, there is a third shaft shoulder 46. Inside the shaft sleeve 291, there is a first retaining ring 47 corresponding to the third shaft shoulder 46. On the input shaft 283, there is a second retaining ring 48 flush with the first retaining ring 47. On the side of the sun gear 284 facing the second retaining ring 48, there is a fourth shaft shoulder 49. The outer ring of the fifth bearing 42 is pressed between the third shaft shoulder 46 and the first retaining ring 47, and the inner ring of the fifth bearing 42 is pressed between the fourth shaft shoulder 49 and the second retaining ring 48.

[0074] It should be noted that the first retaining ring 47 has a certain elasticity. There is a clamping groove in the shaft sleeve 291 that cooperates with the first retaining ring 47. After the first retaining ring 47 is compressed, it can be placed into the shaft sleeve 291 and snap into the clamping groove after elastic reset. The assembly of the second retaining ring 48 is the same, so it will not be elaborated here.

[0075] In addition, in this embodiment, the fourth bearing 41 is a double-row cylindrical tapered bearing, and the fifth bearing 42 is a cylindrical roller bearing, which can bear the axial force generated during the operation of the input shaft 283 and will not transmit the axial force to the output shaft 54 of the motor, increasing the axial load of the output shaft 54 and cutting off the transmission of the axial load between the reduction gearbox and the motor. Of course, in other embodiments, the installation positions of the fourth bearing 41 and the fifth bearing 42 can be swapped according to the spatial structure distribution of the reduction gearbox chamber, and are not limited to the arrangement in this embodiment.

[0076] Refer to Figure 5 , the limit stop 45 includes a flap portion 452 and a screw portion 451 integrally formed on one side of the flap portion 452. On the outer end of the input shaft 283, there is a screw hole that mates with the screw. It can be understood that by tightening the screw portion 451, the flap portion 452 can be moved toward the fourth bearing 41 until the inner ring of the fourth bearing 41 is pressed.

[0077] Furthermore, to facilitate the assembler to rotate the limit stop 45, a hexagonal slot can be opened at the center point position of the flap portion 452.

[0078] Refer to Figure 1 and Figure 2 , on the side of the bottom plate 11 facing away from the reduction gearbox side plate 12, there are a motor inner ring side plate 51 and a motor outer ring side plate 52. The space between the motor inner ring side plate 51 and the motor outer ring side plate 52 forms a part of the motor chamber. It can be seen that in this embodiment, the reduction gearbox and the motor share the bottom plate 11 structure, which is beneficial to further saving space, reducing the overall axial dimension, and reducing costs.

[0079] In summary, for the planetary reducer in the above embodiments of the present utility model, by providing a plurality of counting teeth 22 on the outer peripheral edge of the planet carrier 21, the speed measurement gear and the planet carrier 21 are combined into one, eliminating the assembly steps of the speed measurement gear. At the same time, the space occupied by the measurement gear in the reducer chamber is also reduced, which is beneficial to the overall small-size structural design of the reducer.

[0080] Second Embodiment

[0081] Please refer to Figure 1 and Figure 2 , the second embodiment of the present utility model further proposes an electric drive assembly, including the planetary reducer described in the above technical solution.

[0082] Specifically, the electric drive assembly in this embodiment is mainly applied to the transportation field, and can be used for both passenger transportation and cargo transportation. The electric drive assembly of this solution can be distributed and directly arranged inside each wheel rim and beside the wheel, with flexible arrangement. It can be configured with front-wheel two-wheel drive, rear-wheel two-wheel drive, or even four-wheel drive at the same time. This solution has a small axial space and a compact structure, a large speed ratio and a large output torque, and a regular external shape, which is conducive to arrangement, making the interior space of the whole vehicle have a large flat surface.

[0083] Refer to Figure 2 , the electric drive assembly includes a motor secondary housing 53. The structure of the motor secondary housing 53 is similar to the structure on the motor side of the bottom plate 11. The motor secondary housing 53 can be spliced with the motor outer ring side plate 52 to form a complete motor housing. An output shaft 54 connected to the input shaft 283 is rotatably provided in the motor housing. The output shaft 54 is coaxially arranged with the input shaft 283, and a motor rotor 55 is provided on the output shaft 54. Motor stators 56 for maintaining an air gap are provided on both sides of the motor rotor 55.

[0084] In this embodiment, the motor on one side of the planetary reducer is an axial flux motor, and there is only a single planetary gear set structure in the planetary reducer, fully inheriting and carrying forward the advantages of the short axial space of the axial flux motor. The single planetary gear set structure is coordinated with the axial flux motor to make full use of the radial envelope space of the motor, increase the speed ratio, and achieve large torque output.

[0085] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0086] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A planetary speed reducer, characterized in that, Comprising: A planet carrier (21), the planet carrier (21) includes a left side plate (211) and a right side plate (212) arranged oppositely, and a plurality of fixing platforms (213) are connected between the left side plate (211) and the right side plate (212), and the plurality of fixing platforms (213) are arranged at intervals in the circumferential direction; Planet gears (214), the planet gears (214) are arranged between the left side plate (211) and the right side plate (212), and are located in the space between two adjacent fixing platforms (213); A planet gear shaft (254), one end of the planet gear shaft (254) sequentially penetrates through the left side plate (211) and the planet gear (214) until it abuts against the right side plate (212); An output flange (24), the output flange (24) is fixed on the left side plate (211) and presses against the other end of the planet gear shaft (254).

2. The planetary speed reducer according to claim 1, wherein At the center points of the left side plate (211) and the right side plate (212), there are both through first shaft holes (251), the left side plate (211) is provided with a plurality of second shaft holes (252) surrounding the first shaft hole (251), the right side plate (212) is provided with a counterbore (253) corresponding to the second shaft hole (252), and one end of the planet gear shaft (254) is inserted from the second shaft hole (252) until it is fitted into the counterbore (253).

3. The planetary speed reducer according to claim 2, characterized in that, The output flange (24) includes a flange plate (241) and a spline transmission shaft (242) provided on one side of the flange plate (241), the flange plate (241) is provided with a plurality of mounting holes (243) surrounding the spline transmission shaft (242), the left side plate (211) is provided with threaded holes (244) penetrating into the fixing platforms (213), the threaded holes (244) and the mounting holes (243) are arranged in one-to-one correspondence, and the mounting holes (243) are used to penetrate first bolts (245) to connect the threaded holes (244), so as to realize the assembly of the output flange (24) on the planet carrier (21).

4. The planetary speed reducer according to claim 3, characterized in that, The left side plate (211) is provided with an annular groove (271) surrounding the first shaft hole (251), the annular groove (271) passes through a plurality of the second shaft holes (252), a plurality of bayonets (272) are provided on the periphery of one end of the planet gear shaft (254) located at the flange plate (241), and an annular rib (273) aligned with the annular groove (271) is provided on the surface of the flange plate (241) facing the left side plate (211). When the output flange (24) is connected to the left side plate (211), the annular rib (273) cooperates with the annular groove (271) and at least two of the bayonets (272) of each planet gear shaft (254) to limit the self-rotation of the planet gear shaft (254).

5. The planetary speed reducer according to claim 4, characterized in that The planetary gear (214) is rotationally and matingly connected to the planetary gear shaft (254) through a first bearing (255). An oil sump (261) is formed by a depression at one end of the output flange (24). A plurality of first oil holes (262) corresponding to the first bearing (255) are provided in the inner wall of the oil sump (261). A second oil hole (263) aligned with the oil sump (261) is provided in the flange plate (241).

6. The planetary speed reducer according to claim 5, wherein, An oil collecting ring (264) corresponding to the second oil hole (263) is provided on the side of the flange plate (241) facing away from the left side plate (211).

7. The planetary speed reducer according to claim 6, characterized in that The oil collecting ring (264) includes a vertical portion (2641) connected to the flange plate (241). A horizontal portion (2642) extends horizontally inward from one end of the vertical portion (2641) away from the flange plate (241). The orthographic projection of the horizontal portion (2642) on the flange plate (241) coincides with the second oil hole (263).

8. The planetary speed reducer according to claim 5, characterized in that, An oil guiding groove (274) is provided on the left side plate (211). One end of the oil guiding groove (274) communicates with the first shaft hole (251), and the other end communicates with the second shaft hole (252). At least one of the bayonets (272) on the planetary gear shaft (254) corresponds to the oil guiding groove (274).

9. The planetary speed reducer according to claim 5, wherein, The bottom of the oil sump (261) is conical.

10. An electric drive assembly, characterized in that, Including the planetary speed reducer according to any one of claims 1 to 9.

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