Planet carrier assembly and planetary reducer

Abstract

The planet carrier assembly comprises a planet carrier 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, through first shaft holes are formed in the center points of the left side plate and the right side plate, and through second shaft holes are formed in the center points of the left side plate and the right side plate. A second shaft hole surrounding the first shaft hole is formed in the left side plate, and a sinking groove aligned with the second shaft hole is formed in the right side plate; the output flange is detachably connected with one side of the left side plate, one end of the planet wheel shaft abuts against the sinking groove, the other end of the planet wheel shaft is pressed and fixed by the output flange, and a planet wheel is rotationally arranged on the planet wheel shaft. Wherein the output flange and the planet carrier are made of different metal materials, and the material density of the planet carrier is smaller than that of the output flange. Compared with the scheme that a traditional planet carrier assembly is integrally cast and formed through cast steel, on the premise that the load is guaranteed, the weight of the planet carrier assembly can be reduced, and the lightweight design requirement of the speed reducer is met.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a planet carrier assembly and a planetary reducer. Background Art

[0002] In the design of traditional reducers, the planetary gear structure is gradually becoming the preferred transmission solution for hybrid electric vehicles and high-performance electric vehicles due to its significant advantages such as compact structure, light weight, large transmission ratio range, high transmission efficiency, and stable operation.

[0003] In a reducer, as one of the core components, the planet carrier assembly is not only a key structure for supporting planetary gears and realizing power distribution, but also directly affects the weight and performance of the entire reducer. Traditional planet carriers are mostly made of steel. Although steel has good mechanical strength and wear resistance, its relatively high density results in a relatively large mass of the planet carrier and the entire reducer, which not only increases the energy consumption burden of the vehicle, but also limits the further improvement of the vehicle in terms of lightweight. Summary of the Utility Model

[0004] Based on this, the purpose of the utility model is to provide a planet carrier assembly and a planetary reducer to solve the technical problems mentioned in the above background art.

[0005] On the one hand, the utility model provides a planet carrier assembly, including:

[0006] 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. Through first shaft holes are provided at the center points of the left side plate and the right side plate, and the first shaft holes are used for passing through the input shaft of the reducer. A second shaft hole surrounding the first shaft hole is provided on the left side plate, and a counterbore aligned with the second shaft hole is provided on the right side plate. The second shaft hole is used for inserting a planetary gear shaft until it abuts against the counterbore;

[0007] An output flange, the output flange is detachably connected to one side of the left side plate. One end of the planetary gear shaft abuts against the counterbore, and the other end is fixedly pressed by the output flange. A planetary gear is rotatably arranged on the planetary gear shaft;

[0008] Wherein, the output flange and the planet carrier are made of different metal materials, and the material density of the planet carrier is less than the material density of the output flange.

[0009] Further, in the planet carrier assembly, the planet carrier is made of cast iron, and the output flange is made of cast steel.

[0010] Further, for the planetary carrier assembly, 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 in the flange plate. Threaded holes penetrating the fixed table 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 planetary carrier.

[0011] Further, for the planetary carrier assembly, the threaded holes penetrate the fixed table.

[0012] Further, for the planetary carrier assembly, the planetary gear is rotationally and movably connected to the planetary gear shaft through a first bearing. An oil sump is formed by a depression at one end of the planetary gear shaft located at the output flange. A plurality of first oil holes corresponding to the first bearing are formed in the inner wall of the oil sump. Second oil holes aligned with the oil sump are formed in the flange plate, and an oil collecting ring corresponding to the second oil holes is provided on the side of the flange plate facing away from the left side plate.

[0013] Further, for the planetary carrier assembly, a drainage groove extends outward from the edge of the first shaft hole. Third oil holes are formed in the flange plate, and the third oil holes are aligned with the ends of the drainage grooves.

[0014] Further, for the planetary carrier assembly, a ring groove surrounding the first shaft hole is provided on the left side plate, and the ring groove passes through a plurality of the second shaft holes along the diameter. A plurality of bayonet slots are provided on the peripheral edge of one end of the planetary gear shaft located at the flange plate. A ring rib aligned with the ring groove is provided on the side 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 slots of each planetary gear shaft to limit the rotation of the planetary gear shaft.

[0015] Further, for the planetary carrier assembly, 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 slots on the planetary gear shaft corresponds to the oil guiding groove.

[0016] Further, for the planetary carrier assembly, a hollow hole is provided at the position corresponding to the sunk groove on the right side plate.

[0017] On the other hand, the present utility model also provides a planetary reducer, including the planetary carrier assembly in the above technical solution.

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

[0019] The planet carrier and the output flange that make up the planet carrier assembly are made of different materials and manufactured separately. Compared with the traditional planet carrier assembly that is integrally cast with cast steel, it can reduce the weight of the planet carrier assembly while ensuring the load, meeting the lightweight design requirements of the reducer. 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 planet carrier assembly in the present utility model;

[0023] Figure 4 It is Figure 2 a partial enlarged schematic view of position A in

[0024] Figure 5 It is Figure 1 a partial 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 Element Symbol Explanation:

[0028] 10. Rear housing of the reducer; 11. Base plate; 12. Side plate of the reducer;

[0029] 20. Planetary reduction gear set; 21. Planet carrier; 211. Left side plate; 212. Right side plate; 213. Fixed platform; 214. Planet gear; 22. Counting tooth; 23. Rotation speed sensor;

[0030] 24. Output flange; 241. Flange plate; 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 collecting ring; 2641. Vertical part; 2642. Horizontal part;

[0033] 271. Ring groove; 272. Bayonet; 273. Ring rib; 274. Oil guiding 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 speed reducer; 31. Top plate; 32. Mounting 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 motor; 52. Outer side plate of motor; 53. Motor auxiliary housing; 54. Output shaft; 55. Motor rotor; 56. Motor stator

[0039] 61. Drainage groove; 62. Third oil hole

[0040] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0041] 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, these embodiments are provided so that the disclosure of the present invention is thorough and comprehensive.

[0042] 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.

[0043] 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 herein in the specification of the present invention 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.

[0044] First Embodiment

[0045] Please refer to Figures 2 to 4 , the planet carrier assembly in the first embodiment of the present utility model includes a planet carrier 21 and an output flange 24. The planet carrier 21 includes a left side plate 211 and a right side plate 212 which are oppositely arranged. A plurality of fixed platforms 213 are connected between the left side plate 211 and the right side plate 212. Through holes of 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 passing through the input shaft 283 of the reducer. A second shaft hole 252 surrounding the first shaft hole 251 is provided on the left side plate 211. A counterbore 253 aligned with the second shaft hole 252 is provided on the right side plate 212. The second shaft hole 252 is used for inserting a planet gear shaft 254 until it abuts against the counterbore 253;

[0046] The output flange 24 is detachably connected to one side of the left side plate 211. One end of the planet gear shaft 254 abuts against the counterbore 253, and the other end is fixedly pressed by the output flange 24. A planet gear 214 is rotatably provided on the planet gear shaft 254;

[0047] Among them, the output flange 24 and the planet carrier 21 are made of different materials, and the material density of the planet carrier 21 is less than the material density of the output flange 24.

[0048] It can be understood that the planet carrier 21 and the output flange 24 constituting the planet carrier assembly are made of different materials and manufactured separately. Specifically, the large-sized planet carrier 21 is made of cast iron, while the output flange 24 bearing large loads is still made of cast steel. Compared with the traditional planet carrier assembly formed by integral casting of cast steel, it can reduce the weight of the planet carrier assembly on the premise of ensuring the load, meeting the lightweight design requirements of the reducer. Secondly, the cost of cast iron is lower than that of cast steel, which can effectively save the manufacturing cost.

[0049] In this embodiment, the output flange 24 and the planet carrier 21 are fixedly connected by a first bolt 245. Please refer to specifically 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 into 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. Thus, by passing the first bolt 245 through the mounting holes 243 and connecting the threaded holes 244, the assembly of the output flange 24 on the planet carrier 21 can be realized.

[0050] Further, in this embodiment, the threaded hole 244 penetrates through the fixed platform 213, aiming to minimize the use of redundant materials, thereby reducing the weight of the planet carrier 21.

[0051] Refer to Figure 4 , the planet gear 214 is rotationally and fittingly connected to the planet gear shaft 254 through a first bearing 255. An oil collecting groove 261 is formed by recessing 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 plate 241. 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.

[0052] 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 hole 252. Then, insert the planet gear shaft 254 into the second shaft hole 252 and pass through the inner ring of the first bearing 255 until it abuts against the sink 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, and the flange plate 241 of the output flange 24 presses the planet gear shaft 254 against the sink 253 to achieve axial constraint. Thus, in this embodiment, the fixing of the planet gear shaft 254 no longer requires a riveting process, and it can be achieved by press-fitting with the flange plate 241 of the output flange 24, which not only simplifies the assembly process but also reduces the assembly cost.

[0053] It should be noted that in this embodiment, the first bearing 255 includes but is not limited to a needle bearing, and can be specifically adjusted according to needs.

[0054] In actual application, when the reducer is running normally, the oil collecting ring 264 can collect some of the oil in the reducer chamber and guide the oil to enter the oil collecting groove 261 of the planet gear shaft 254 through the second oil hole 263, and then discharge it through the first oil hole 262 to lubricate the first bearing 255.

[0055] Specifically, in this embodiment, the oil collecting ring 264 is integrally formed on the flange plate 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 plate 241. One end of the vertical portion 2641 away from the flange plate 241 extends horizontally inward with a horizontal portion 2642, and the orthographic projection of the horizontal portion 2642 on the flange plate 241 coincides with the second oil hole 263. It can be understood that when the reducer is working, the oil thrown off in its chamber can be collected inside the oil collecting ring 264 and thus be guided into the second oil hole 263.

[0056] Furthermore, the bottom of the oil collecting tank 261 is conical, which is conducive to the outward discharge of the oil in the oil collecting tank 261, and can reduce the accumulation of oil in the oil collecting tank 261 to a certain extent.

[0057] Refer to Figure 3 , a drainage groove 61 extends outward from the edge of the first shaft hole 251, a third oil hole 62 is formed in the flange 241, and the third oil hole 62 is aligned with the end of the drainage groove 61. This third shaft hole is used for part of the oil in the reducer chamber to enter, and under the guidance of the drainage groove 61, it flows into the first shaft hole 251, thereby lubricating the relevant bearings on the input shaft 283.

[0058] Continue to refer to Figure 3 , a ring groove 271 surrounding the first shaft hole 251 is provided on the left side plate 211, the ring groove 271 passes through a plurality of the second shaft holes 252, a plurality of bayonet slots 272 are provided on the periphery of one end of the planet gear shaft 254 located on the flange 241, and 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 of the bayonet slots 272 of each planet gear shaft 254, thereby restricting the rotation of the planet gear shaft 254.

[0059] Furthermore, 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, and at least one of the bayonet slots 272 on the planet gear shaft 254 corresponds to the oil guiding groove 274. It can be understood that by providing the oil guiding groove 274, the oil in the oil collecting tank 261 not only leads out the sliding first bearing 255 through the first oil hole 262, but also can enter the oil guiding groove 274 through the bayonet slot 272, and then enter the first shaft hole 251 under the guidance of the oil guiding groove 274, thereby lubricating the relevant bearings on the input shaft 283.

[0060] Combined with Figure 2 and Figure 4 , a hollow hole 256 is provided on the right side plate 212 corresponding to the position of the sunk groove 253. The design of this hollow hole 256 aims to achieve a lightweight structural design, reduce the overall weight of the 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.

[0061] In summary, for the planet carrier assembly in the above embodiments of the present utility model, the planet carrier 21 and the output flange 24 that constitute the planet carrier assembly are manufactured separately using different materials. Compared with the traditional planet carrier assembly that is integrally cast using cast steel, it can reduce the weight of the planet carrier assembly while ensuring the load, meeting the lightweight design requirements of the reducer.

[0062] Second Embodiment

[0063] Please refer to Figures 1 to 7 , a planetary reducer is further proposed in the second embodiment of the present utility model. The planetary reducer 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 constitutes a part of the reducer chamber, and a planetary reduction gear set 20 is installed in the reducer chamber;

[0064] The planetary reduction gear set 20 includes a planet carrier 21 rotatably provided in the reducer chamber. A plurality of counting teeth 22 are spaced apart on the outer peripheral edge of the planet carrier 21. A rotational speed sensor 23 is provided on the reducer side plate 12, and the measuring end of the rotational speed sensor 23 extends into the reducer chamber and corresponds to the counting teeth 22.

[0065] 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 step 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.

[0066] The working principle of the rotational 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 rotational speed sensor 23 can measure the rotation frequency of the counting teeth 22 on the planet carrier 21. The rotational speed of the planet carrier 21 can be calculated by the frequency of the counting teeth 22 passing through the rotational speed sensor 23 and the number of teeth of the counting teeth 22 on the planet carrier 21, thereby obtaining the rotational speed of the reducer.

[0067] In this embodiment, the bottom plate 11 and the reducer side plate 12 together form the reducer rear shell 10. The planet carrier assembly further includes a reducer front shell 30 spliced and integrated with the reducer rear shell 10. The planetary reduction gear set 20 is provided between the reducer front shell 30 and the reducer rear shell 10. Specifically, the reducer front shell 30 is composed of a top plate 31 and a mounting flat plate 32 provided on the periphery of the top plate 31. The top plate 31 arches relative to the mounting flat plate 32, thereby forming another part of the reducer chamber. The mounting flat plate 32 can be connected to the reducer side plate 12 through the second bolt 33 to realize the assembly of the reducer front shell 30 and the reducer rear shell 10.

[0068] It is worth mentioning 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, ensuring the accuracy of the rotational speed sensor 23 in measuring the rotational speed of the planet carrier 21. The output flange 24 that bears large loads is made of cast steel. The two are made of different materials, achieving a reasonable division of labor, giving full play to the advantages of their respective materials, and also reducing the overall manufacturing difficulty and cost.

[0069] Refer 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 planet gear 214. An input shaft 283 is provided at the central axis of the planet carrier 21. A sun gear 284 that meshes with the planet gear 214 is provided on the outer wall of the input shaft 283.

[0070] In practical applications, the input shaft 283 is driven to rotate by a motor, so that the sun gear 284 drives the planet gear 214 to rotate. At the same time, the planet gear 214 meshes with the ring gear 282. The planet gear 214 rotates around its own axis and also revolves. Finally, the planet carrier 21 outputs power.

[0071] Furthermore, a plurality of engaging teeth 285 are annularly arrayed on the outer edge of the ring gear 282. A tooth groove 286 that cooperates with the engaging teeth 285 is provided on the inner side of the reducer side plate 12. The engaging teeth 285 are in clearance fit in the tooth groove 286 in the radial direction. 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 the uniform distribution of loads and smooth meshing.

[0072] Refer 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 that cooperates with the second bearing 292 is recessed on the bottom plate 11. A second bearing chamber 295 that cooperates with the third bearing 293 is provided on the inner side of the top plate 31.

[0073] 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 the whole, the two-way support of the 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.

[0074] 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.

[0075] 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 input shaft 283 has better stiffness and strength. 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.

[0076] 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 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 45 and the sun gear 284, without the need for additional parts such as snap rings or bearing retainers to restrict the axial movement of the fourth bearing 41, saving space and reducing the manufacturing cost at the same time.

[0077] 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 one 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.

[0078] 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.

[0079] In addition, in this embodiment, the fourth bearing 41 is a double-row cylindrical taper 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 conduction 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, rather than being limited to the arrangement in this embodiment.

[0080] Refer to Figure 5 , the limit stop 45 includes a flap part 452 and a screw part 451 integrally formed on one side of the flap part 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 part 451, the flap part 452 can be moved towards the fourth bearing 41 until the inner ring of the fourth bearing 41 is pressed.

[0081] Furthermore, in order to facilitate the assembler to rotate the limit stop 45, a hexagonal slot can be opened at the center point of the flap part 452.

[0082] 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 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 conducive to further saving space, reducing the overall axial dimension, and reducing costs.

[0083] Third Embodiment

[0084] Please refer toFigure 1 and Figure 2 Moreover, in the third embodiment of the present utility model, an electric drive assembly is further proposed, which includes the planetary reducer described in the above technical solution.

[0085] 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 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 shape, which is conducive to arrangement, making the interior space of the whole vehicle a large flat surface.

[0086] Referring 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 arranged in the motor housing. The output shaft 54 is coaxially arranged with the input shaft 283, and a motor rotor 55 is arranged on the output shaft 54. Motor stators 56 for maintaining an air gap are arranged on both sides of the motor rotor 55.

[0087] In this embodiment, the motor on the side of the planet carrier 21 of the reducer is an axial-flux motor, and there is only a single planetary gear set structure in the planet carrier 21 of the reducer, fully inheriting and carrying forward the advantages of the axial-flux motor with a short axial space. 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.

[0088] 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 any one or more embodiments or examples in a suitable manner.

[0089] The above-described embodiments only represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but 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 belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A planet carrier assembly, 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, a plurality of fixed platforms (213) are connected between the left side plate (211) and the right side plate (212), through 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 passing through the input shaft (283) of the reducer, a second shaft hole (252) surrounding the first shaft hole (251) is provided on the left side plate (211), a counterbore (253) aligned with the second shaft hole (252) is arranged on the right side plate (212), and the second shaft hole (252) is used for inserting a planet gear shaft (254) until it abuts against the counterbore (253); An output flange (24), the output flange (24) is detachably connected to one side of the left side plate (211), one end of the planet gear shaft (254) abuts against the counterbore (253) and the other end is pressed and fixed by the output flange (24), and a planet gear (214) is rotatably arranged on the planet gear shaft (254); Wherein, the output flange (24) and the planet carrier (21) are made of different metal materials, and the material density of the planet carrier (21) is less than the material density of the output flange (24).

2. The planet carrier assembly according to claim 1, characterized in that, The planet carrier (21) is made of cast iron, and the output flange (24) is made of cast steel.

3. The planet carrier assembly according to claim 1, wherein, The output flange (24) includes a flange disc (241) and a spline transmission shaft (242) arranged on one side of the flange disc (241), a plurality of mounting holes (243) surrounding the spline transmission shaft (242) are opened on the flange disc (241), threaded holes (244) penetrating into 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, and the mounting holes (243) are used for passing through first bolts (245) to connect the threaded holes (244), thereby realizing the assembly of the output flange (24) on the planet carrier (21).

4. The planet carrier assembly according to claim 3, characterized in that, The threaded holes (244) penetrate through the fixed platforms (213).

5. The planet carrier assembly according to claim 3, characterized in that, The planet gear (214) is rotationally and fittingly connected to the planet gear shaft (254) through a first bearing (255), an oil sump (261) is recessed 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 opened on the inner wall of the oil sump (261), a second oil hole (263) aligned with the oil sump (261) is opened on the flange disc (241), and an oil collecting ring (264) corresponding to the second oil hole (263) is arranged on the side of the flange disc (241) facing away from the left side plate (211).

6. The planet carrier assembly according to claim 3, characterized in that, A drainage groove (61) extends outward from the edge of the first shaft hole (251), and a third oil hole (62) is opened on the flange disc (241), and the third oil hole (62) is aligned with the end of the drainage groove (61).

7. The planet carrier assembly according to claim 3, characterized in that, A ring groove (271) surrounding the first shaft hole (251) is provided on the left side plate (211). 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 planet gear shaft (254) located on the flange plate (241). A ring rib (273) aligned with the ring 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 ring rib (273) cooperates with the ring groove (271) and at least two bayonets (272) of each planet gear shaft (254) to limit the rotation of the planet gear shaft (254) about its own axis.

8. The planet carrier assembly according to claim 7, 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 bayonet (272) on the planet gear shaft (254) corresponds to the oil guiding groove (274).

9. The planet carrier assembly according to claim 1, characterized in that, A hollow hole (256) is provided on the right side plate (212) corresponding to the position of the counterbore (253).

10. A planetary speed reducer, characterized in that, Comprising the planet carrier assembly according to any one of claims 1 to 9.

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