Planetary reducer and electric drive assembly

Abstract

The utility model provides a planetary reducer and an electric drive assembly, the planetary reducer comprises a bottom plate and a reducer side plate arranged on one side of the bottom plate, the inner side of the reducer side plate forms a part of a reducer cavity, and a planetary reduction gear set is installed in the reducer cavity; the planetary reduction gear set comprises a planet carrier rotationally arranged in the speed reducer cavity, a plurality of counting teeth are distributed on the outer periphery of the planet carrier at intervals, a rotating speed sensor is arranged on the speed reducer side plate, and the measuring end of the rotating speed sensor extends into the speed reducer cavity and corresponds to the counting teeth. The multiple counting teeth are arranged on the outer periphery of the planet carrier, the speed measuring gear and the planet carrier are combined into one, the assembling step of the speed measuring gear is omitted, meanwhile, the space occupied by the measuring gear for a cavity of the speed reducer is reduced, and the structural design of the whole small size of the speed reducer is facilitated.

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 Art

[0002] As an important component in a mechanical transmission system, a planetary reducer is widely used in occasions that require high-precision and high-torque transmission. In these applications, the speed measurement function is crucial for monitoring and controlling the operating state of the transmission system. However, when most current planetary reducers implement the speed measurement function, they usually additionally install a speed measurement gear and a speed measurement sensor in their chambers, which undoubtedly increases the complexity and space occupation of the reducer chamber, resulting in a relatively large overall size of the reducer. 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 art.

[0004] On the one hand, the utility model provides a planetary reducer, which includes a bottom plate and a reducer side plate arranged on one side of the bottom plate. The inner side of the reducer side plate forms a part of the reducer chamber, and a planetary reduction gear set is installed in the reducer chamber.

[0005] The planetary reduction gear set includes a planet carrier rotatably arranged in the reducer chamber. A plurality of counting teeth are distributed at intervals on the outer periphery of the planet carrier. A speed sensor is arranged on the reducer side plate, and the measuring end of the speed sensor extends into the reducer chamber and corresponds to the counting teeth.

[0006] Further, in the planetary reducer, the counting teeth are integrally formed with the planet carrier by casting.

[0007] Further, in the planetary reducer, the planet carrier includes a left side plate and a right side plate arranged oppositely. A plurality of fixing platforms are connected between the left side plate and the right side plate. The plurality of fixing platforms are arranged at intervals in the circumferential direction. A planetary gear is rotatably arranged between two adjacent fixing platforms. The counting teeth are integrally formed on the periphery of the left side plate or the right side plate.

[0008] Further, in the planetary reducer, an output flange is connected to one side of the left side plate of the planet carrier. The output flange is a steel part, and the planet carrier is made of cast iron.

[0009] 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 in the flange plate. Threaded holes penetrating into 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, so as to realize the assembly of the output flange on the planet carrier.

[0010] Further, for the planetary speed reducer, through holes are provided at the center points of both 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, and the second shaft holes are located in the area between two adjacent fixed tables. A counterbore corresponding to the second shaft hole is provided on the right side plate. A planetary gear shaft is arranged between the counterbore and the flange plate, and the planetary gear is rotationally and cooperatively connected to the planetary gear shaft through a first bearing.

[0011] Further, for the planetary speed reducer, the planetary speed reducer further includes a reducer front housing. The reducer front housing includes a top plate and a mounting flat plate provided at the periphery of the top plate. The top plate arches relative to the mounting flat plate, thereby forming another part of the reducer chamber. The mounting flat plate can be connected to the reducer side plate through second bolts.

[0012] Further, for the planetary speed reducer, a step is provided on the inner side of the reducer side plate. A ring gear is supported on the step. The ring gear meshes with the planetary gear. An input shaft passing through the first shaft hole is provided at the central axis of the planet carrier, and a sun gear meshing with the planetary gear is provided on the outer wall of the input shaft.

[0013] Further, for the planetary speed reducer, a plurality of engaging teeth are annularly arranged on the outer edge of the ring gear. Tooth grooves cooperating with the engaging teeth are provided on the inner side of the reducer side plate. The engaging teeth are in clearance fit with the tooth grooves in the radial direction, and the ring gear is in clearance fit between the mounting flat plate and the step in the axial direction.

[0014] On the other hand, the present utility model also provides an electric drive assembly, including the planetary speed reducer described in the above technical solution.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] By providing a plurality of counting teeth on the outer periphery of the planet carrier, the speed measuring gear and the planet carrier 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 structural design of the overall small size of the reducer. Description of the Drawings

[0017] Figure 1 This is a cross-sectional view of the planetary reducer in the present utility model;

[0018] Figure 2 This is an exploded view of the planetary reducer in the present utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the planetary reducer in the present utility model;

[0020] Figure 4 is Figure 2 a partially enlarged schematic view of position A in

[0021] Figure 5 is Figure 1 a partially enlarged schematic view of position B in

[0022] Figure 6 This is an exploded view of the planet carrier and the input shaft in the present utility model;

[0023] Figure 7 This is a specific structural schematic diagram of the output flange in the present utility model;

[0024] Description of main component symbols:

[0025] 10. Rear housing of the reducer; 11. Base plate; 12. Side plate of the reducer;

[0026] 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;

[0027] 24. Output flange; 241. Flange plate; 242. Spline transmission shaft; 243. Mounting hole; 244. Threaded hole; 245. First bolt;

[0028] 251. First shaft hole; 252. Second shaft hole; 253. Sunk groove; 254. Planet gear shaft; 255. First bearing; 256. Hollow hole;

[0029] 261. Oil sump; 262. First oil hole; 263. Second oil hole; 264. Oil collecting ring; 2641. Vertical part; 2642. Horizontal part;

[0030] 271. Ring groove; 272. Bayonet; 273. Ring rib; 274. Oil guiding groove;

[0031] 281. Step; 282. Ring gear; 283. Input shaft; 284. Sun gear; 285. Locking tooth; 286. Tooth groove;

[0032] 291. Bush; 292. Second bearing; 293. Third bearing; 294. First bearing chamber; 295. Second bearing chamber;

[0033] 30. Front housing of the reducer; 31. Top plate; 32. Mounting plate; 33. Second bolt;

[0034] 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;

[0035] 51. Inner side plate of the motor ring; 52. Outer side plate of the motor ring; 53. Motor sub-housing; 54. Output shaft; 55. Motor rotor; 56. Motor stator.

[0036] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0037] For ease 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 shown 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 complete.

[0038] 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.

[0039] 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 description of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0040] First embodiment

[0041] Please refer to Figures 1 to 7 , the planetary reducer in the first embodiment of the present invention 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;

[0042] The planetary reduction gear set 20 includes a planet carrier 21 rotatably disposed 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. The measuring end of the rotational speed sensor 23 extends into the reducer chamber and corresponds to the counting teeth 22.

[0043] 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. At the same time, it also reduces the space occupied by the measuring gear in the reducer chamber, which is beneficial to the overall small-size structural design of the reducer.

[0044] 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, so as to obtain the rotational speed of the reducer.

[0045] In this embodiment, the bottom plate 11 and the reducer side plate 12 together form the reducer rear shell 10. The planetary reducer further includes a reducer front shell 30 spliced and integrated with the reducer rear shell 10. The planetary reduction gear set 20 is disposed 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, thus 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.

[0046] Refer to Figure 3 and Figure 6 As shown in, the planet carrier 21 includes a left side plate 211 and a right side plate 212 arranged oppositely. A plurality of fixing platforms 213 are connected between the left side plate 211 and the right side plate 212. The plurality of fixing platforms 213 are spaced apart along the circumferential direction. A planetary gear 214 is rotatably provided between two adjacent fixing platforms 213. The counting teeth 22 are integrally formed on the peripheral edge of the left side plate 211 or the right side plate 212. In this embodiment, the counting teeth 22 are integrally formed on the peripheral edge of the right side plate 212, and the number of the fixing platforms 213 is 3. Therefore, 3 planetary gears 214 are rotatably provided on the planet carrier 21. Of course, in actual application, the number of the fixing platforms 213 and the planetary gears 214 can be adjusted as required. This embodiment is only an example rather than a limitation.

[0047] Further, an output flange 24 is connected to one side of the planet carrier 21 located on the left side plate 211. Among them, 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, 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 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.

[0048] In this embodiment, the output flange 24 and the planet carrier 21 are fixedly connected by a first bolt 245. For details, refer 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 into the fixing platform 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 to connect the threaded holes 244, the assembly of the output flange 24 on the planet carrier 21 can be realized.

[0049] Refer to Figures 2 to 4 , through holes 251 are provided at the center points of both the left side plate 211 and the right side plate 212 for the input shaft 283 of the speed reducer to pass through. A plurality of second through holes 252 surrounding the through hole 251 are provided on the left side plate 211. The second through holes 252 are located in the area between adjacent fixing platforms 213. A sink 253 corresponding to the second through holes 252 is provided on the right side plate 212. A planet gear shaft 254 is arranged between the sink 253 and the flange plate 241. The planet gear 214 is rotationally and cooperatively connected to the planet gear shaft 254 through a first bearing 255.

[0050] 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 their positions 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 sinking groove 253 of 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 sinking groove 253 to achieve axial constraint. It can be seen that in this embodiment, the fixation of the planet gear shaft 254 no longer requires a riveting process and 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.

[0051] 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.

[0052] Furthermore, a hollow hole 256 is provided at the position of the right side plate 212 corresponding to the sinking 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 while ensuring the structural strength and rigidity, thereby saving material costs.

[0053] Refer to Figure 4 , a 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.

[0054] In practical applications, 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 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 far from the flange 241 extends horizontally inward to form 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 reducer is working, the oil thrown off in its chamber can be collected inside the oil collecting ring 264 and thus guided into the second oil hole 263.

[0056] Further, 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.

[0057] 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 side 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 in the circumferential direction.

[0058] Further, 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 planetary 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 groove 261 can not only be led out through the first oil hole 262 to lubricate the first roller bearing 255, but also enter the oil guiding groove 274 through the bayonet 272 and then be guided by the oil guiding groove 274 into the first shaft hole 251 to lubricate the relevant bearings on the input shaft 283.

[0059] Specifically, 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 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.

[0060] 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 while revolving around the sun gear. Finally, the power is output by the planet carrier 21.

[0061] 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 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.

[0062] 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, and 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, and a second bearing chamber 295 that cooperates with the third bearing 293 is provided on the inner side of the top plate 31.

[0063] 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 the second bearing 292 and the 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.

[0064] 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.

[0065] Refer to Figure 1 , Figure 5 and Figure 6, 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 within 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 single-bearing cantilever support of the traditional planetary row sun gear 284, 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.

[0066] 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. There is no 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 manufacturing costs at the same time.

[0067] A third shaft shoulder 46 is provided on the inner wall of the first shaft hole 251 of the right side plate 212, a first retaining ring 47 corresponding to the third shaft shoulder 46 is provided within the bushing 291, a second retaining ring 48 flush with the first retaining ring 47 is provided on the input shaft 283, and a fourth shaft shoulder 49 is provided on the side of the sun gear 284 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.

[0068] It should be noted that the first retaining ring 47 has a certain elasticity. A clamping groove cooperating with the first retaining ring 47 is provided within the bushing 291. After the first retaining ring 47 is compressed, it can be placed within the bushing 291 and snapped 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.

[0069] 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 transfer 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.

[0070] Referring 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. The outer end of the input shaft 283 is provided with 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.

[0071] 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 portion 452.

[0072] Referring 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, and a part of the motor chamber is formed between the motor inner ring side plate 51 and the motor outer ring side plate 52. 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.

[0073] In summary, for the planetary reduction gearbox in the above embodiments of the present utility model, by providing a plurality of counting teeth 22 on the outer periphery 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, and at the same time reducing the space occupied by the measurement gear in the reduction gearbox chamber, which is beneficial to the overall small-size structural design of the reduction gearbox.

[0074] Second Embodiment

[0075] Please refer to Figure 1 and Figure 2 , the second embodiment of the present utility model also proposes an electric drive assembly, including the planetary reduction gearbox described in the above technical solution.

[0076] Specifically, in this embodiment, the electric drive assembly 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 external shape, which is conducive to arrangement, making the interior space of the whole vehicle a large flat surface.

[0077] Referring to Figure 2 , the electric drive assembly includes a motor sub-housing 53. The structure of the motor sub-housing 53 is similar to the structure on the motor side of the bottom plate 11. The motor sub-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.

[0078] 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 axial-flux motor in terms of 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.

[0079] 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.

[0080] The above-described embodiments merely represent several implementation manners of the present utility model, and the description thereof is 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 planetary speed reducer, characterized in that, It 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. 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).

2. The planetary speed reducer according to claim 1, characterized in that, The counting teeth (22) are integrally formed with the planet carrier (21) by casting.

3. The planetary speed reducer according to claim 1, characterized in that, The planet carrier (21) includes a left side plate (211) and a right side plate (212) arranged oppositely. A plurality of fixing platforms (213) are connected between the left side plate (211) and the right side plate (212). The plurality of fixing platforms (213) are spaced apart along the circumferential direction. A planet gear (214) is rotatably provided between two adjacent fixing platforms (213). The counting teeth (22) are integrally formed on the periphery of the left side plate (211) or the right side plate (212).

4. The planetary speed reducer according to claim 3, characterized in that, An output flange (24) is connected to one side of the left side plate (211) of the planet carrier (21). The output flange (24) is a steel part, and the planet carrier (21) is made of cast iron.

5. The planetary speed reducer according to claim 4, 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). A plurality of mounting holes (243) surrounding the spline transmission shaft (242) are formed in the flange plate (241). Threaded holes (244) penetrating the fixing 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. 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).

6. The planetary speed reducer according to claim 5, wherein, Through first shaft holes (251) are provided at the center points of the left side plate (211) and the right side plate (212). A plurality of second shaft holes (252) surrounding the first shaft hole (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 hole (252) is provided on the right side plate (212). A planet gear shaft (254) is arranged between the counterbore (253) and the flange plate (241). The planet gear (214) is rotatably connected to the planet gear shaft (254) through a first bearing (255).

7. The planetary speed reducer according to claim 6, characterized in that, The planetary speed reducer further includes a front housing (30) of the speed reducer. The front housing (30) of the speed reducer includes a top plate (31) and a mounting flat plate (32) provided at 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 speed reducer chamber. The mounting flat plate (32) can be connected to the side plate (12) of the speed reducer by a second bolt (33).

8. The planetary speed reducer according to claim 7, wherein A step (281) is provided on the inner side of the side plate (12) of the speed reducer. A ring gear (282) is supported on the step (281). The ring gear (282) meshes with the planetary gear (214). An input shaft (283) passing through the first shaft hole (251) 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).

9. The planetary speed reducer according to claim 8, characterized in that, A plurality of locking teeth (285) are annularly arrayed on the outer edge of the ring gear (282). A tooth groove (286) cooperating with the locking teeth (285) is provided on the inner side of the side plate (12) of the speed reducer. The locking teeth (285) are in clearance fit with the tooth groove (286) in the radial direction. The ring gear (282) is in clearance fit between the mounting flat plate (32) and the step (281) in the axial direction.

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

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