Planetary reducer

Abstract

The invention provides a planetary reducer which comprises a reducer rear shell, a reducer front shell and a planetary reduction gear set, the reducer rear shell and the reducer front shell are spliced into a whole, so that a reducer cavity is formed between the reducer rear shell and the reducer front shell, and the planetary reduction gear set is installed in the reducer cavity; the planetary reduction gear set comprises a planet carrier rotationally arranged in the reducer cavity, one side of the planet carrier is connected with an output flange, the other side of the planet carrier is provided with a shaft sleeve collinear with the axis of the output flange, the reducer rear shell is provided with a second bearing matched with the shaft sleeve, and the reducer front shell is provided with a third bearing matched with the output flange. The two ends of the planet carrier are supported on the speed reducer rear shell and the speed reducer front shell through the second bearing and the third bearing respectively, double-end supporting of the planet carrier is achieved, the rigidity of the planet carrier is remarkably enhanced, deflection deformation of the planet carrier in the working process is reduced, and therefore the transmission precision and stability of the planetary gear set are improved.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a planetary gear reducer. Background Technology

[0002] In traditional reducer design, planetary gear structures are gradually becoming the preferred transmission solution for hybrid electric vehicles and high-performance electric vehicles due to their significant advantages such as compact structure, light weight, wide transmission ratio range, high transmission efficiency, and smooth operation.

[0003] In a reducer, the planetary carrier, as one of the core components, is not only a key structure that supports the planetary gears and realizes power distribution, but also directly affects the weight and performance of the entire reducer. However, most planetary carriers are currently cantilevered single-support structures, meaning that the planetary carrier is only supported at the rear end by a bearing, and the front end of the planetary carrier is unsupported. This support method can lead to problems such as large deflection of the planetary carrier, bending and torsional deformation of the planetary gear shaft, and uneven load on the planetary gear meshing. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a planetary reducer to solve the technical problems mentioned in the background section.

[0005] This invention proposes a planetary reducer, including a reducer rear housing, a reducer front housing, and a planetary reduction gear set. The reducer rear housing and the reducer front housing are spliced ​​together, thereby forming a reducer chamber between the reducer rear housing and the reducer front housing. The planetary reduction gear set is installed in the reducer chamber.

[0006] The planetary reduction gear set includes a planetary carrier rotatably disposed in the reducer chamber. An output flange is connected to one side of the planetary carrier, and a bushing collinear with the axis of the output flange is provided on the other side of the planetary carrier. A second bearing that mates with the bushing is provided on the rear housing of the reducer, and a third bearing that mates with the output flange is provided on the front housing of the reducer.

[0007] Furthermore, in the planetary reducer, the reducer rear housing includes a base plate and a reducer side plate disposed around the periphery of the base plate, the inner side of the reducer side plate forming part of the reducer chamber, and the surface of the base plate facing the reducer chamber is recessed to form a first bearing chamber for loading the second bearing.

[0008] The reducer front housing includes a top plate and a mounting plate disposed around the periphery of the top plate. The mounting plate connects to the reducer side plate, thereby enabling the splicing between the reducer front housing and the reducer rear housing. The top plate arches relative to the mounting plate, thereby forming another part of the reducer chamber. A second bearing chamber for loading the third bearing is provided on the surface of the top plate facing the reducer chamber.

[0009] Furthermore, in the planetary reducer, the planetary reduction gear set further includes planetary gears, planetary gear shafts, a gear ring, and an input shaft. The planetary carrier includes a left side plate and a right side plate arranged opposite to each other. A plurality of fixed platforms are connected between the left side plate and the right side plate. The planetary gears are disposed between the left side plate and the right side plate and are located in the space between two adjacent fixed platforms.

[0010] One end of the planetary gear shaft passes sequentially through the left side plate and the planetary gear until it abuts against the right side plate. The output flange is fixed to the left side plate and presses against the other end of the planetary gear shaft.

[0011] The gear ring is disposed on the inner wall of the reducer side plate and meshes with the planetary gear;

[0012] The input shaft is coaxially connected to the output shaft of the motor, and a sun gear that meshes with the planetary gears is integrally formed on the input shaft.

[0013] Furthermore, in the planetary reducer, the output flange includes a flange and a spline drive shaft located on one side of the flange. The spline drive shaft mates with the third bearing. The flange has multiple mounting holes surrounding the spline drive shaft. The left side plate has threaded holes for inserting into the fixed platform. The threaded holes correspond one-to-one with the mounting holes. The mounting holes are used to insert first bolts to connect to the threaded holes, thereby enabling the assembly of the output flange on the planetary carrier.

[0014] Furthermore, in the planetary reducer, a first shaft hole is provided at the center point of both the left side plate and the right side plate, the first shaft hole being used for the input shaft to pass through. The left side plate is provided with a plurality of second shaft holes surrounding the first shaft hole, and the right side plate is provided with a groove corresponding to the second shaft hole, the second shaft hole being used for the planetary gear shaft to pass through until it is inserted into the groove.

[0015] Furthermore, in the planetary reducer, the left side plate is provided with an annular groove surrounding the first shaft hole, the annular groove passes through multiple second shaft holes, the planetary gear shaft is provided with multiple bayonets at one end of the flange, and the side of the flange facing the left side plate is provided with annular ribs aligned with the annular groove. When the output flange is connected to the left side plate, the annular ribs cooperate with the annular groove and at least two of the bayonets of each planetary gear shaft to restrict the rotation of the planetary gear shaft.

[0016] Furthermore, in the planetary reducer, the inner side of the reducer side plate is provided with a step to support the gear ring, the outer edge of the gear ring is arranged in a ring with multiple retaining teeth, the inner side of the reducer side plate is provided with a tooth groove that mates with the retaining teeth, the retaining teeth are clearance-fitted into the tooth groove in the radial direction, and the gear ring is clearance-fitted between the mounting plate and the step in the axial direction.

[0017] Furthermore, in the planetary reducer, a fourth bearing and a fifth bearing are sleeved on the input shaft, the fourth bearing and the fifth bearing are respectively located on both sides of the sun gear, wherein the fourth bearing is engaged between the output flange and the left side plate, and the fifth bearing is engaged in the bushing.

[0018] Furthermore, in the planetary reducer, the inner wall of the first shaft hole of the left side plate is provided with a first shoulder, the inner wall of the spline drive shaft is provided with a second shoulder corresponding to the first shoulder, a limiting stop is provided at one end of the input shaft outward, the outer ring of the fourth bearing is pressed between the first shoulder and the second shoulder, and the inner ring of the fourth bearing is pressed between the limiting stop and the sun gear.

[0019] Furthermore, in the planetary reducer, the limiting stop includes a baffle portion and a screw portion integrally formed on one side of the baffle portion, and the outer end of the input axis is provided with a screw hole that mates with the screw.

[0020] Furthermore, in the planetary reducer, the inner wall of the first shaft hole of the right side plate is provided with a third shoulder, the bushing is provided with a first retaining ring corresponding to the third shoulder, the input shaft is provided with a second retaining ring flush with the first retaining ring, the sun gear is provided with a fourth shoulder on the side facing the second retaining ring, the outer ring of the fifth bearing is pressed between the third shoulder and the first retaining ring, and the inner ring of the fifth bearing is pressed between the fourth shoulder and the second retaining ring.

[0021] Furthermore, in the planetary reducer, the bottom plate has an inner motor ring side plate and an outer motor ring side plate on the side facing away from the reducer side plate, and the inner motor ring side plate and the outer motor ring side plate together form part of the motor chamber.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The planetary carrier is supported at both ends by the second and third bearings on the rear and front housings of the reducer, respectively, achieving double-end support for the planetary carrier. This significantly enhances the rigidity of the planetary carrier, reduces its deflection during operation, and thus improves the transmission accuracy and stability of the planetary gear set. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the planetary reducer in this invention;

[0025] Figure 2 This is an exploded view of the planetary reducer in this invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the planetary reducer in this invention;

[0027] Figure 4 for Figure 2 A magnified view of a portion of position A in the diagram;

[0028] Figure 5 for Figure 1 A magnified view of a portion of position B in the diagram;

[0029] Figure 6 This is an exploded view of the planetary carrier and input shaft in this invention;

[0030] Figure 7 This is a schematic diagram of the specific structure of the output flange in this invention;

[0031] Explanation of key component symbols:

[0032] 10. Reducer rear housing; 11. Base plate; 12. Reducer side plate;

[0033] 20. Planetary reduction gear set; 21. Planetary carrier; 211. Left side plate; 212. Right side plate; 213. Fixed platform; 214. Planetary gear; 22. Counting teeth; 23. Speed ​​sensor;

[0034] 24. Output flange; 241. Flange; 242. Splined drive shaft; 243. Mounting hole; 244. Threaded hole; 245. First bolt;

[0035] 251. First shaft hole; 252. Second shaft hole; 253. Countersunk groove; 254. Planetary gear shaft; 255. First bearing; 256. Hollow hole;

[0036] 261. Oil collecting groove; 262. First oil hole; 263. Second oil hole; 264. Oil collecting ring; 2641. Vertical part; 2642. Horizontal part;

[0037] 271. Annular groove; 272. Bayonet; 273. Annular rib; 274. Oil guide groove;

[0038] 281. Step; 282. Gear ring; 283. Input shaft; 284. Sun gear; 285. Gear clip; 286. Gear groove;

[0039] 291. Bushing; 292. Second bearing; 293. Third bearing; 294. First bearing housing; 295. Second bearing housing;

[0040] 30. Reducer front housing; 31. Top plate; 32. Mounting plate; 33. Second bolt;

[0041] 41. Fourth bearing; 42. Fifth bearing; 43. First shoulder; 44. Second shoulder; 45. Limiting stop; 451. Screw section; 452. Baffle section; 46. Third shoulder; 47. First retaining ring; 48. Second retaining ring; 49. Fourth shoulder;

[0042] 51. Inner ring side plate of motor; 52. Outer ring side plate of motor; 53. Secondary housing of motor; 54. Output shaft; 55. Motor rotor; 56. Motor stator;

[0043] 61. Drainage channel; 62. Third oil hole.

[0044] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0045] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0046] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] First Embodiment

[0049] Please see Figures 1 to 7The planetary reducer in the first embodiment of the present invention includes a reducer rear housing 10, a reducer front housing 30 and a planetary reducer gear set 20. The reducer rear housing 10 and the reducer front housing 30 are spliced ​​together, thereby forming a reducer chamber between the reducer rear housing 10 and the reducer front housing 30. The planetary reducer gear set 20 is installed in the reducer chamber.

[0050] The planetary reduction gear set 20 includes a planet carrier 21 rotatably disposed in the reducer chamber. An output flange 24 is connected to one side of the planet carrier 21, and a bushing 291 collinear with the axis of the output flange 24 is provided on the other side of the planet carrier 21. A second bearing 292 that cooperates with the bushing 291 is provided on the rear housing 10 of the reducer, and a third bearing 293 that cooperates with the output flange 24 is provided on the front housing 30 of the reducer.

[0051] It should be noted that in this embodiment, the bushing 291 is 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, the second bearing 292 and the third bearing 293 are respectively set at both ends of the whole to achieve bidirectional support for the whole. 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.

[0052] Furthermore, in this embodiment, both the second bearing 292 and the third bearing 293 are preferably single-row tapered roller bearings, which can withstand a certain axial force and increase the axial load of the output flange 24.

[0053] See Figure 1 and Figure 2 The reducer rear housing 10 includes a base plate 11 and a reducer side plate 12 disposed around the base plate 11. The inner side of the reducer side plate 12 forms part of the reducer chamber. The surface of the base plate 11 facing the reducer chamber is recessed to form a first bearing chamber 294 for loading the second bearing 292.

[0054] The reducer front housing 30 includes a top plate 31 and a mounting plate 32 disposed around the top plate 31. The mounting plate 32 and the reducer side plate 12 can be connected by a second bolt 33, thereby realizing the splicing between the reducer front housing 30 and the reducer rear housing 10. The top plate 31 is arched relative to the mounting plate 32, thereby forming another part of the reducer chamber. The surface of the top plate 31 facing the reducer chamber is provided with a second bearing chamber 295 for loading the third bearing 293.

[0055] See Figure 3The planetary carrier 21 has multiple counting teeth 22 spaced apart on its outer periphery. The speed sensor 23 is provided on the reducer side plate 12. The measuring end of the speed sensor 23 extends into the reducer cavity and corresponds to the counting teeth 22.

[0056] In this embodiment, the counting gear 22 is integrally formed with the planetary carrier 21 by casting, that is, the speed measuring gear and the planetary carrier 21 are integrated into one, which eliminates the assembly step of the speed measuring gear, and also reduces the space occupied by the measuring gear in the reducer chamber, which is conducive to the overall small size structure design of the reducer.

[0057] The working principle of the speed sensor 23 is as follows: the counting tooth 22 is integrally formed with the planet carrier 21. When the planet carrier 21 rotates, the speed sensor 23 can measure the frequency of the rotation of the counting tooth 22 on the planet carrier 21. By measuring the frequency of the counting tooth 22 passing through the speed sensor 23 and the number of teeth of the counting tooth 22 on the planet carrier 21, the speed of the planet carrier 21 can be calculated, thereby obtaining the speed of the reducer.

[0058] See Figure 3 and Figure 6 The planetary reduction gear set 20 further includes planetary gears 214, planetary gear shafts 254, gear rings 282, and input shafts 283. The planetary carrier 21 includes a left side plate 211 and a right side plate 212 arranged opposite to each other. A plurality of fixed platforms 213 are connected between the left side plate 211 and the right side plate 212. The plurality of fixed platforms 213 are spaced apart along the circumferential direction. The planetary gears 214 are disposed between the left side plate 211 and the right side plate 212 and are located in the space between two adjacent fixed platforms 213.

[0059] One end of the planetary gear shaft 254 passes sequentially through the left side plate 211 and the planetary gear 214 until it abuts against the right side plate 212. The output flange 24 is fixed to the left side plate 211 and presses against the other end of the planetary gear shaft 254.

[0060] The gear ring 282 is disposed on the inner wall of the reducer side plate 12 and meshes with the planetary gear 214;

[0061] The input shaft 283 is coaxially connected to the output shaft 54 ​​of the motor, and a sun gear 284 that meshes with the planetary gear 214 is integrally formed on the input shaft 283.

[0062] In this embodiment, the counting teeth 22 are integrally formed on the periphery of the right side plate 212, and there are 3 fixed platforms 213, so that 3 planetary gears 214 are rotatably provided on the planet carrier 21. Of course, in actual applications, the number of fixed platforms 213 and planetary gears 214 can be adjusted as needed. This embodiment is only an example and not a limitation.

[0063] Furthermore, in this embodiment, the output flange 24 is made of steel, while the planetary carrier 21 is made of cast iron. It is understandable that the complex planetary carrier 21, made of cast iron, can precisely form the structure of the counting teeth 22, ensuring the accuracy of the speed sensor 23's measurement of the planetary carrier 21's speed. In contrast, the output flange 24, which bears a large load, is made of steel. The use of different materials for both achieves a reasonable division of labor, fully utilizing the advantages of their respective materials, and also reduces the overall manufacturing difficulty, weight, and cost.

[0064] In this embodiment, the output flange 24 and the planetary carrier 21 are connected and fixed by a first bolt 245, as detailed in the following document. Figure 6 The output flange 24 includes a flange 241 and a spline drive shaft 242 located on one side of the flange 241. The flange 241 has multiple mounting holes 243 surrounding the spline drive shaft 242. The left side plate 211 has threaded holes 244 that pass through the fixed platform 213. The threaded holes 244 and the mounting holes 243 are arranged in a one-to-one correspondence. Thus, by passing a first bolt 245 through the mounting hole 243 and connecting it to the threaded hole 244, the output flange 24 can be assembled on the planetary carrier 21.

[0065] See Figures 2-4 Both the left side plate 211 and the right side plate 212 have a through first shaft hole 251 at their center points. The first shaft hole 251 is used for the input shaft 283 of the reducer to pass through. The left side plate 211 has a plurality of second shaft holes 252 surrounding the first shaft hole 251. The second shaft holes 252 are located in the area between two adjacent fixed platforms 213. The right side plate 212 has a groove 253 corresponding to the second shaft hole 252. The second shaft hole 252 is used for the planetary gear shaft 254 to pass through until it is inserted into the groove 253. The planetary gear 214 is rotatably connected to the planetary gear shaft 254 through a first bearing 255.

[0066] The specific assembly steps for planetary gear 214 are as follows: First, insert planetary gear 214 and first bearing 255 into the side of planet carrier 21 and adjust their position to ensure that the inner ring of first bearing 255 is aligned with second shaft hole 252. Then, insert planetary gear shaft 254 into second shaft hole 252 and pass through the inner ring of first bearing 255 until it abuts against the groove 253 of right side plate 212. Repeat the above steps until all planetary gears 214 are assembled. Then, install output flange 24. The flange 241 of output flange 24 presses planetary gear shaft 254 against groove 253 to achieve axial constraint. Therefore, in this embodiment, the planetary gear shaft 254 no longer requires riveting; it can be fixed by pressing with flange 241 of output flange 24, which simplifies the assembly process and reduces assembly costs.

[0067] It should be noted that in this embodiment, the first bearing 255 includes, but is not limited to, needle roller bearings, and can be adjusted as needed.

[0068] Furthermore, the right side plate 212 is provided with a hollow hole 256 at the position corresponding to the sink 253. The hollow hole 256 is designed to achieve a lightweight structural design and reduce the overall weight of the reducer. At the same time, the hollow design can reduce the amount of material used while ensuring structural strength and rigidity, thereby saving material costs.

[0069] See Figure 4 The planetary gear shaft 254 is recessed at one end of the output flange 24 to form an oil collection groove 261. The inner wall of the oil collection groove 261 is provided with a plurality of first oil holes 262 corresponding to the first bearing 255. The flange 241 is provided with second oil holes 263 aligned with the oil collection groove 261. The side of the flange 241 facing away from the left side plate 211 is provided with an oil collection ring 264 corresponding to the second oil hole 263.

[0070] In practical applications, when the reducer is running normally, the oil collecting ring 264 can collect part of the oil in the 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 through the first oil hole 262 to lubricate the first bearing 255.

[0071] Specifically, in this embodiment, the oil collecting ring 264 is integrally formed on the flange 241, replacing the traditional oil baffle part and eliminating assembly. The oil collecting ring 264 includes a vertical portion 2641 connected to the flange 241, and a horizontal portion 2642 extending inward from the end of the vertical portion 2641 away from the flange 241. 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 reducer is working, the oil splashed in its chamber can be collected on the inner side of the oil collecting ring 264 and then guided into the second oil hole 263.

[0072] Furthermore, the bottom of the oil collecting tank 261 is conical, which facilitates the outward discharge of oil in the oil collecting tank 261 and can reduce the accumulation of oil in the oil collecting tank 261 to a certain extent.

[0073] See Figure 3 The first shaft hole 251 has an outwardly extending drainage groove 61 at its edge, and a third oil hole 62 is provided on the flange 241, which is aligned with the end of the drainage groove 61. This third shaft hole allows some oil from the reducer chamber to enter and flow into the first shaft hole 251 under the guidance of the drainage groove 61, thereby lubricating the relevant bearings on the input shaft 283.

[0074] See Figure 3 The left side plate 211 is provided with an annular groove 271 surrounding the first shaft hole 251. The annular groove 271 passes through multiple second shaft holes 252. The planetary gear shaft 254 is provided with multiple bayonets 272 on the periphery of one end of the flange 241. The side of the flange 241 facing the left side plate 211 is provided with annular ribs 273 aligned with the annular groove 271. When the output flange 24 is connected to the left side plate 211, the annular ribs 273 cooperate with the annular groove 271 and at least two bayonets 272 of each planetary gear shaft 254 to restrict the rotation of the planetary gear shaft 254.

[0075] Furthermore, the left side plate 211 is provided with an oil guide groove 274. One end of the oil guide groove 274 is connected to the first shaft hole 251, and the other end is connected to the second shaft hole 252. At least one of the retaining clips 272 on the planetary gear shaft 254 corresponds to the oil guide groove 274. It can be understood that by opening the oil guide groove 274, the oil in the oil collection groove 261 can not only be led out of the first bearing 255 of the pulley through the first oil hole 262, but also enter the oil guide groove 274 through the retaining clip 272, and then enter the first shaft hole 251 under the guidance of the oil guide groove 274, thereby lubricating the relevant bearings on the input shaft 283.

[0076] For details, please refer to Figure 2 and Figure 3 The inner side of the reducer side plate 12 is provided with a step, the gear ring 282 is supported on the step, the gear ring 282 meshes with the planet gear 214, the input shaft 283 is provided at the central axis of the planet carrier 21, and the sun gear 284 integrally formed on the input shaft 283 meshes with the planet gear 214.

[0077] In practical applications, the input shaft 283 is driven to rotate by a motor, which in turn drives the planetary gears 214 to rotate. At the same time, the planetary gears 214 mesh with the ring gear 282. The planetary gears 214 rotate on their own axis and also revolve around the sun. Finally, the power is output by the planet carrier 21.

[0078] Furthermore, the outer annular array of the gear ring 282 has multiple retaining teeth 285, and the inner side of the reducer side plate 12 is provided with tooth grooves 286 that mate with the retaining teeth 285. The retaining teeth 285 are clearance-fitted into the tooth grooves 286 in the radial direction, and the gear ring 282 is clearance-fitted between the mounting plate 32 and the step in the axial direction. This design allows the gear ring 282 to have a small amount of floating in both the radial and axial directions when it is assembled with the reducer side plate 12, which is beneficial for uniform load distribution and smooth meshing.

[0079] See Figure 1 , Figure 5 and Figure 6 The input shaft 283 is fitted with a fourth bearing 41 and a fifth bearing 42, which are located on both sides of the sun gear 284. The fourth bearing 41 is engaged between the output flange 24 and the left side plate 211, and the fifth bearing 42 is engaged within the bushing 291. Therefore, in this embodiment, the input shaft 283 is supported at both ends by the fourth bearing 41 and the fifth bearing 42. Compared to the traditional single-bearing cantilever support of the planetary gear sun gear 284, the input shaft 283 has better rigidity and strength. Furthermore, the input shaft 283 and the output flange 24 are directly centered via the inner and outer diameters of the fourth bearing 41, eliminating the need for other pin holes, pins, or other auxiliary structures or parts, resulting in higher precision and better concentricity.

[0080] Specifically, the inner wall of the first shaft hole 251 of the left side plate 211 is provided with a first shaft shoulder 43, the inner wall of the spline drive shaft 242 is provided with a second shaft shoulder 44 corresponding to the first shaft shoulder 43, a limiting stop 45 is provided at the outward 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 45 and the sun gear 284. No additional retaining rings or bearing pressure plates are needed to constrain the axial movement of the fourth bearing 41, saving space and reducing manufacturing costs.

[0081] The inner wall of the first shaft hole 251 of the right side plate 212 is provided with a third shaft shoulder 46. The bushing 291 is provided with a first retaining ring 47 corresponding to the third shaft shoulder 46. The input shaft 283 is provided with a second retaining ring 48 flush with the first retaining ring 47. The sun gear 284 is provided with a fourth shaft shoulder 49 on the side facing the second retaining ring 48. 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.

[0082] It should be noted that the first retaining ring 47 has a certain degree of elasticity. The bushing 291 is provided with a groove that mates with the first retaining ring 47. When the first retaining ring 47 is compressed, it can be placed into the bushing 291 and snapped into the groove after elastic reset. The assembly of the second retaining ring 48 is similar, so it will not be described in detail here.

[0083] In addition, in this embodiment, the fourth bearing 41 is a double-row tapered cylindrical bearing, and the fifth bearing 42 is a cylindrical roller bearing. These bearings can withstand the axial force generated when the input shaft 283 is working, preventing the axial force from being transferred to the motor's output shaft 54 ​​and thus avoiding increasing the axial load on the output shaft 54. This also cuts off the transmission of the axial load between the gearbox and the motor. Of course, in other embodiments, the installation positions of the fourth bearing 41 and the fifth bearing 42 can be interchanged according to the spatial structure distribution of the gearbox chamber, and are not limited to the arrangement in this embodiment.

[0084] See Figure 5 The limiting stop 45 includes a stop portion 452 and a screw portion 451 integrally formed on one side of the stop portion 452. The input shaft 283 has a screw hole at one outward end that mates with the screw. It can be understood that tightening the screw portion 451 will cause the stop portion 452 to move towards the fourth bearing 41 until it presses against the inner ring of the fourth bearing 41.

[0085] Furthermore, to facilitate the rotation of the limiting stop 45 by the assembler, a hexagonal slot can be made at the center point of the stop portion 452.

[0086] See Figure 1 and Figure 2 The base plate 11 has an inner motor ring side plate 51 and an outer motor ring side plate 52 on the side facing away from the reducer side plate 12. The inner motor ring side plate 51 and the outer motor ring side plate 52 together form part of the motor chamber. Therefore, in this embodiment, the reducer and motor share the same base plate 11 structure, which helps to further save space, reduce the overall axial dimension, and lower costs.

[0087] In summary, in the planetary reducer of the above embodiments of the present invention, the two ends of the planet carrier 21 are supported on the rear housing 10 and the front housing 30 of the reducer by the second bearing 292 and the third bearing 293 respectively, realizing the double-end support of the planet carrier 21, which significantly enhances the rigidity of the planet carrier 21, reduces its deflection deformation during operation, and thus improves the transmission accuracy and stability of the planetary gear set.

[0088] Second Embodiment

[0089] Please see Figure 1 and Figure 2 The second embodiment of the present invention also proposes an electric drive assembly, including the planetary reducer described in the above technical solution.

[0090] Specifically, in this embodiment, the electric drive assembly is mainly applied in the transportation sector, suitable for both passenger and freight transport. The electric drive assembly in this solution can be distributed and directly arranged within and beside each wheel rim, offering flexible configuration options. It can be configured as a front-engine two-wheel drive, a rear-engine two-wheel drive, or even a four-wheel drive system. This solution features a compact axial space, a high gear ratio and high output torque, a regular shape that facilitates layout, and a large flat surface within the vehicle's interior.

[0091] See Figure 2 The electric drive assembly includes a motor sub-housing 53. The structure of the motor sub-housing 53 is similar to that of the motor side of the base plate 11. The motor sub-housing 53 can be spliced ​​with the outer ring side plate 52 of the motor to form a complete motor housing. An output shaft 54 ​​connected to the input shaft 283 is rotatably provided inside 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 with air gap retention are provided on both sides of the motor rotor 55.

[0092] In this embodiment, the motor on one side of the planetary reducer is an axial flux motor, while the planetary reducer has only a single planetary gear structure. This fully inherits and develops the advantages of the short axial space of the axial flux motor. The single planetary gear structure coordinates and matches the axial flux motor, making full use of the radial envelope space of the motor, increasing the speed ratio, and achieving high torque output.

[0093] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A planetary reduction gear, characterized in that, The reducer rear shell (10) and the reducer front shell (30) are spliced together, so that a reducer cavity is formed between the reducer rear shell (10) and the reducer front shell (30), and the planetary reduction gear set (20) is installed in the reducer cavity. The planetary reduction gear set (20) comprises a planet carrier (21) rotating in the reducer cavity, one side of the planet carrier (21) is connected with an output flange (24), the other side of the planet carrier (21) is provided with a shaft sleeve (291) coaxial with the output flange (24), the reducer rear shell (10) is provided with a second bearing (292) matched with the shaft sleeve (291), and the reducer front shell (30) is provided with a third bearing (293) matched with the output flange (24).

2. The planetary reducer of claim 1, wherein, The reducer rear shell (10) comprises a bottom plate (11) and a reducer side plate (12) arranged at the periphery of the bottom plate (11), the inner side of the reducer side plate (12) forms part of the reducer cavity, and the surface of the bottom plate (11) on the side facing the reducer cavity is recessed to form a first bearing chamber (294) loading the second bearing (292). The reducer front shell (30) comprises a top plate (31) and a mounting flat plate (32) arranged at the periphery of the top plate (31), the mounting flat plate (32) is connected with the reducer side plate (12), so as to realize the splicing between the reducer front shell (30) and the reducer rear shell (10), the top plate (31) is arched relative to the mounting flat plate (32), so as to form another part of the reducer cavity, and the surface of the top plate (31) on the side facing the reducer cavity is provided with a second bearing chamber (295) loading the third bearing (293).

3. The planetary reducer of claim 2, wherein, The planetary reduction gear set (20) further comprises a planetary gear (214), a planetary gear shaft (254), a ring gear (282) and an input shaft (283), the planet carrier (21) comprises oppositely arranged left and right side plates (211) and (212), a plurality of fixing platforms (213) are connected between the left and right side plates (211) and (212), and the planetary gear (214) is arranged between the left and right side plates (211) and (212) and located in the space between adjacent two fixing platforms (213). One end of the planetary gear shaft (254) sequentially penetrates the left side plate (211) and the planetary gear (214) and abuts against the right side plate (212), and the output flange (24) is fixed on the left side plate (211) and presses the other end of the planetary gear shaft (254); The ring gear (282) is arranged on the inner wall of the reducer side plate (12) and is in mesh with the planetary gear (214); and The input shaft (283) is arranged on the inner wall of the reducer side plate (12) and is in mesh with the ring gear (282). The input shaft (283) is coaxially connected with the output shaft (54) of the motor, and a sun gear (284) is integrally formed on the input shaft (283) and is in meshing engagement with the planetary gears (214).

4. The planetary reducer of claim 3, wherein, The output flange (24) comprises a flange plate (241) and a spline transmission shaft (242) arranged on one side of the flange plate (241), the spline transmission shaft (242) is matched with the third bearing (293), a plurality of mounting holes (243) are formed in the flange plate (241) and surround the spline transmission shaft (242), a threaded hole (244) is arranged on the left side plate (211) and penetrates the fixed table (213), the threaded hole (244) is arranged in one-to-one correspondence with the mounting hole (243), the mounting hole (243) is used for penetrating the first bolt (245) to connect the threaded hole (244), so that the assembly of the output flange (24) on the planetary carrier (21) is realized.

5. The planetary reduction gear of claim 4, wherein First shaft holes (251) are arranged at the center points of the left side plate (211) and the right side plate (212) and penetrate the left side plate (211) and the right side plate (212), the first shaft holes (251) are used for the input shaft (283) to penetrate, a plurality of second shaft holes (252) are arranged on the left side plate (211) and surround the first shaft hole (251), and a sink groove (253) corresponding to the second shaft hole (252) is arranged on the right side plate (212), the second shaft hole (252) is used for the planetary gear shaft (254) to penetrate until the planetary gear shaft (254) is inserted into the sink groove (253).

6. The planetary reducer of claim 5, wherein, A ring groove (271) is arranged on the left side plate (211) and surrounds the first shaft hole (251), the ring groove (271) passes through the plurality of second shaft holes (252), a plurality of clamping grooves (272) are arranged on the periphery of one end of the flange plate (241) and are located on the planetary gear shaft (254), and a ring rib (273) aligned with the ring groove (271) is arranged on the side 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 ring rib (273) is matched with the ring groove (271) and at least two clamping grooves (272) of each planetary gear shaft (254), so as to limit the rotation of the planetary gear shaft (254).

7. The planetary reducer of claim 3, wherein, A step is arranged on the inner side of the reducer side plate (12) and supports the ring gear (282), a plurality of clamping teeth (285) are arranged in an annular array on the outer periphery of the ring gear (282), a tooth groove (286) matched with the clamping teeth (285) is arranged on the inner side of the reducer side plate (12), the clamping teeth (285) are clearance-fitted in the tooth groove (286) in the radial direction, and the ring gear (282) is clearance-fitted between the mounting flat plate (32) and the step in the axial direction.

8. The planetary reducer of claim 4, wherein, The input shaft (283) is sleeved with a fourth bearing (41) and a fifth bearing (42), and the fourth bearing (41) and the fifth bearing (42) are located on both sides of the sun gear (284), wherein the fourth bearing (41) is clamped between the output flange (24) and the left side plate (211), and the fifth bearing (42) is clamped in the shaft sleeve (291).

9. The planetary reduction gear of claim 8, wherein, The inner wall of the first shaft hole (251) of the left side plate (211) is provided with a first shaft shoulder (43), the inner wall of the spline transmission shaft (242) is provided with a second shaft shoulder (44) corresponding to the first shaft shoulder (43), one end of the input shaft (283) outward is provided with a limiting stop piece (45), the outer ring of the fourth bearing (41) is tightly pressed between the first shaft shoulder (43) and the second shaft shoulder (44), and the inner ring of the fourth bearing (41) is tightly pressed between the limiting stop piece (45) and the sun gear (284).

10. The planetary reduction gear of claim 9, wherein The limiting stop piece (45) comprises a stop piece portion (452) and a screw portion (451) integrally formed on one side of the stop piece portion (452), and the outer end of the input shaft (283) is provided with a screw hole matched with the screw.

11. The planetary reducer of claim 8, wherein, The inner wall of the first shaft hole (251) of the right side plate (212) is provided with a third shaft shoulder (46), the shaft sleeve (291) is provided with a first stop ring (47) corresponding to the third shaft shoulder (46), the input shaft (283) is provided with a second stop ring (48) flush with the first stop ring (47), the sun gear (284) is provided with a fourth shaft shoulder (49) on the side facing the second stop ring (48), and the outer ring of the fifth bearing (42) is tightly pressed between the third shaft shoulder (46) and the first stop ring (47), and the inner ring of the fifth bearing (42) is tightly pressed between the fourth shaft shoulder (49) and the second stop ring (48).

12. The planetary reducer of claim 2, wherein, The side of the bottom plate (11) away from the reducer side plate (12) is provided with a motor inner ring side plate (51) and a motor outer ring side plate (52), and the motor inner ring side plate (51) and the motor outer ring side plate (52) form part of a motor cavity.

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