Planet row, speed reducer and vehicle

Abstract

The invention discloses a planet row, a speed reducer and a vehicle. The planet row comprises a planet carrier; the sun gear is rotatably arranged in the planet carrier; the at least one planet assembly comprises a planet shaft, a planet wheel and at least one tapered roller bearing, the planet shaft is arranged on the planet carrier in a penetrating mode, the planet wheel is arranged on the planet shaft in a sleeving mode and meshed with the sun wheel, and the tapered roller bearing is arranged between the planet wheel and the planet shaft; wherein the tapered roller bearing comprises an inner ring and an outer ring, the inner ring is connected with the planet shaft, the outer ring is connected with the planet wheel, and a gap is formed between the inner ring and the outer ring.

Description

Technical Field

[0001] This application belongs to the technical field of vehicles, and particularly relates to a planetary gear set, a speed reducer and a vehicle. Background Art

[0002] A planetary speed reducer is a power transmission mechanism that uses a gear speed converter to reduce the rotational speed of a motor to the desired rotational speed and obtain a larger torque. It is small in size, light in weight, high in load-bearing capacity, long in service life, stable in operation, and has the characteristics of power splitting and multi-tooth meshing exclusive use, and is suitable for automobiles. Existing planetary speed reducers generally include a housing, an input shaft, an output shaft, and a planetary gear train provided in the housing. The planetary gear train includes a sun gear, a planet carrier, planet gears, planet gear shafts, and an internal gear ring. When the input torque drives the sun gear to rotate through the input shaft, a number of planet gears evenly distributed around the sun gear are driven. The planet gears rely on the internal gear ring and the sun gear to float in between. The planet gears revolve around the center following the trace of the internal gear ring, and the rotation of the planet gears drives the output shaft connected to the planet carrier to output power.

[0003] However, in the prior art, when the planet gears mesh, the phenomenon of uneven load distribution is likely to occur. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a planetary gear set, a speed reducer and a vehicle, aiming to at least solve to a certain extent the technical problem that the phenomenon of uneven load distribution is likely to occur when the planet gears mesh.

[0005] The technical solution of the present invention is as follows:

[0006] A planetary gear set includes: a planet carrier; a sun gear rotatably provided in the planet carrier; at least one planetary assembly including: a planet shaft, a planet gear and at least one tapered roller bearing, the planet shaft penetrates through the planet carrier, the planet gear is sleeved on the planet shaft and meshes with the sun gear, and the tapered roller bearing is provided between the planet gear and the planet shaft; wherein, the tapered roller bearing includes an inner ring and an outer ring, the inner ring is connected to the planet shaft, the outer ring is connected to the planet gear, and there is a gap between the inner ring and the outer ring.

[0007] In some embodiments, the number of the tapered roller bearings is multiple, and the multiple tapered roller bearings are arranged in parallel along the axial direction of the planet shaft.

[0008] In some embodiments, the planetary gear set further includes: at least one adjusting member provided between the planet gear and the planet shaft; wherein, the adjusting member is provided between the outer rings of two adjacent tapered roller bearings.

[0009] In some embodiments, at least one positioning groove is formed in the planet gear, and the adjusting member is embedded in the corresponding positioning groove.

[0010] In some embodiments, the number of the planet assemblies is plural, and the planet carrier is provided with a plurality of mounting holes, and the planet shafts of the plurality of planet assemblies respectively pass through the plurality of mounting holes.

[0011] In some embodiments, the plurality of mounting holes are arranged at equal angular intervals.

[0012] In some embodiments, the planet carrier is provided with a plurality of weight-reducing holes.

[0013] In some embodiments, the planetary gear set further includes: a first bearing disposed in the planet carrier; a second bearing disposed in the planet carrier and spaced apart from the first bearing in parallel; wherein, the sun gear passes through the first bearing and the second bearing, and the planet gear is located between the first bearing and the second bearing.

[0014] In some embodiments, the planetary gear set further includes: an internal gear ring meshing with the planet gear; wherein, the planet gear is disposed between the internal gear ring and the sun gear.

[0015] Based on the same inventive concept, the present invention further provides a speed reducer including the planetary gear set.

[0016] Based on the same inventive concept, the present invention further provides a vehicle including the speed reducer.

[0017] The beneficial effects of the present invention at least include:

[0018] Since the sun gear is rotatably disposed in the planet carrier, at least one planet assembly includes: a planet shaft, a planet gear and at least one tapered roller bearing, the planet shaft passes through the planet carrier, the planet gear is sleeved on the planet shaft and meshes with the sun gear. Therefore, when the sun gear can rotate about the axis of the sun gear, the sun gear can drive the planet gear to rotate on the planet shaft, and at the same time, the planet carrier carrying the planet gear also rotates about the axis of the sun gear. Therefore, the planet carrier and the planet gear rotate about the sun gear substantially synchronously.

[0019] Since the tapered roller bearing is disposed between the planet gear and the planet shaft, it is possible to ensure that the planet gear rotates smoothly on the planet shaft.

[0020] Since the tapered roller bearing includes an inner ring and an outer ring, the inner ring is connected to the planetary shaft, the outer ring is connected to the planet gear, and there is a gap between the inner ring and the outer ring, it is possible to make the planet gear float within a certain range, realizing the floating design of the planet gear. When the flow distribution is uneven, the overall force will be directed towards a certain planet gear. Since there is a mutual radial force between this planet gear and the sun gear, the planet gear with a larger force will be pushed away from the sun gear to reduce the force on this planet gear, enabling the load to be evenly distributed among the planet gears automatically when the planet gears are unevenly loaded, achieving the equal load of the planetary gear set. This can reduce the errors caused by manufacturing and installation of the planetary gear set, as well as the uneven load distribution caused by torque mutation during the dynamic operation of the planetary gear set. It also slows down the phenomena such as jamming and excessive deformation of a certain planetary gear caused by uneven loading of each planetary gear, thereby effectively improving the service life, transmission efficiency, and reducing the magnitude of the transmitted torque excitation, and further improving the NVH (Noise, Vibration, Harshness) performance.

[0021] Through the gap between the inner ring and the outer ring, the tapered roller bearing can adapt to the offset caused by the uneven load of forces between components. By the adaptive offset of the inner ring and the outer ring of the tapered roller bearing, the uneven load in this process is balanced, and the purpose of equal load is achieved. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of the planetary gear set for some embodiments;

[0024] Figure 2 For Figure 1 Cross-sectional view of the planetary gear set in

[0025] Figure 3 For Figure 1 Structural schematic diagram of the planet carrier of the planetary gear set in

[0026] Figure 4 For Figure 3 Structural schematic diagram of the planet carrier from another perspective in

[0027] Figure 5 For Figure 4 Rear view of the planet carrier in

[0028] In the drawings:

[0029] Planet carrier 10, mounting hole 11, weight reduction hole 12, body 13, first end plate 14, second end plate 15, chamber 16;

[0030] Sun gear 20;

[0031] Planet assembly 30, planet shaft 31, planet gear 32, positioning groove 321, tapered roller bearing 33, inner ring 331, outer ring 332;

[0032] Adjusting part 40;

[0033] First bearing 50;

[0034] Second bearing 60;

[0035] Third bearing 70;

[0036] Internal gear ring 80. Specific implementation manner

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0038] It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0039] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] As the name implies, a planet revolves around a star. Therefore, a planetary reducer is just like this, a reducer with three planet gears revolving around a sun gear. With the continuous and rapid development of the planetary reducer industry, more and more industries and different enterprises are using planetary reducers. However, during the processing, manufacturing, and installation of the planetary train, there will be errors in the dimensions of each component and the mating clearances between each component, and during the dynamic operation of the planetary train, due to sudden changes in torque, the load distribution is uneven, causing uneven loading on each planet gear of the planetary train, resulting in phenomena such as jamming and excessive deformation of a certain planet gear, thereby reducing the service life of the planetary train, lowering the transmission efficiency of the planetary train, and increasing the magnitude of the transmitted torque excitation, affecting the NVH performance.

[0042] Based on the above technical problems, the present application provides a planetary train, a reducer, and a vehicle, which implement a floating design of the planet gears to solve the problem of uneven load distribution easily generated during the meshing of the planet gears, can achieve equal load sharing of the planetary train, can reduce the errors brought about during the processing, manufacturing, and installation of the planetary train, as well as the uneven load distribution caused by sudden changes in torque during the dynamic operation of the planetary train, and also slow down the phenomena such as jamming and excessive deformation of a certain planetary gear due to uneven loading on each planet gear 32, thereby effectively improving the service life, transmission efficiency, and reducing the magnitude of the transmitted torque excitation, and further improving the NVH (Noise, Vibration, Harshness) performance.

[0043] The present application will be described below with reference to the accompanying drawings and specific embodiments:

[0044] Figure 1 is a structural schematic diagram of a planetary train for some embodiments; Figure 2 is Figure 1 a sectional view of the planetary train in Figure 1 and Figure 2, the planetary gear set of the embodiment of the present application includes: a carrier 10, a sun gear 20, and at least one planetary component 30. The sun gear 20 is rotatably disposed within the carrier 10. The at least one planetary component 30 includes: a planetary shaft 31, a planet gear 32, and at least one tapered roller bearing 33. The planetary shaft 31 passes through the carrier 10. The planet gear 32 is sleeved on the planetary shaft 31 and meshes with the sun gear 20. The tapered roller bearing 33 is disposed between the planet gear 32 and the planetary shaft 31. Wherein, the tapered roller bearing 33 includes an inner ring 331 and an outer ring 332. The inner ring 331 is connected to the planetary shaft 31, the outer ring 332 is connected to the planet gear 32, and there is a gap between the inner ring 331 and the outer ring 332.

[0045] The number of the planetary components 30 can be one or more.

[0046] The number of the tapered roller bearings 33 of one planetary component 30 can be one or more.

[0047] Since the sun gear 20 is rotatably disposed within the carrier 10, and the at least one planetary component 30 includes: a planetary shaft 31, a planet gear 32, and at least one tapered roller bearing 33. The planetary shaft 31 passes through the carrier 10. The planet gear 32 is sleeved on the planetary shaft 31 and meshes with the sun gear 20. Therefore, when the sun gear 20 can rotate about the axis of the sun gear 20, the sun gear 20 can drive the planet gear 32 to rotate on the planetary shaft 31. At the same time, the carrier 10 carrying the planet gear 32 also rotates about the axis of the sun gear 20. Therefore, the carrier 10 and the planet gear 32 rotate about the sun gear 20 substantially synchronously.

[0048] Since the tapered roller bearing 33 is disposed between the planet gear 32 and the planetary shaft 31, it can ensure that the planet gear 32 rotates smoothly on the planetary shaft 31.

[0049] Since the tapered roller bearing 33 includes an inner ring 331 and an outer ring 332, the inner ring 331 is connected to the planetary shaft 31, the outer ring 332 is connected to the planetary gear 32, and there is a gap between the inner ring 331 and the outer ring 332. Therefore, the planetary gear 32 can float within a certain range, realizing the floating design of the planetary gear 32. When the flow distribution is uneven, the overall force will be directed towards a certain planetary gear 32. Since there is a mutual radial force between this planetary gear 32 and the sun gear 20, the planetary gear 32 with a larger force will be pushed away from the sun gear 20 to reduce the force on this planetary gear 32, enabling automatic uniform distribution of the load among the planetary gears 32 when the load on the planetary gears 32 is uneven, achieving the equal load sharing of the planetary gear train, reducing the errors caused by manufacturing and installation of the planetary gear train, as well as the uneven load distribution caused by torque mutation during the dynamic operation of the planetary gear train. It also slows down the phenomena such as jamming and excessive deformation of a certain planetary gear caused by uneven loading of each planetary gear 32, thereby effectively improving the service life, transmission efficiency, and reducing the magnitude of the transmitted torque excitation, and further improving the NVH (Noise, Vibration, Harshness) performance.

[0050] Through the gap between the inner ring 331 and the outer ring 332, the tapered roller bearing 33 can adapt to the offset caused by the uneven load of forces between components. By the adaptive offset of the inner ring 331 and the outer ring 332 of the tapered roller bearing 33, the uneven load in this process is balanced, and thus the purpose of equal load sharing is achieved.

[0051] In some embodiments, along the axial direction of the planetary shaft 31, there is a gap between the inner ring 331 and the outer ring 332. When the overall force is directed towards a certain planetary gear 32, the axial gap between the inner ring 331 and the outer ring 332 can be converted into a radial gap between the outer ring 332 and the inner ring 331, realizing the floating design of the planetary gear 32.

[0052] In some embodiments, in order to ensure close contact between the planetary gear 32 and the outer ring 332, the planetary gear 32 and the outer ring 332 are in interference fit, which can effectively reduce the gap between the planetary gear 32 and the outer ring 332, helping to reduce the energy loss during transmission, thereby improving the transmission efficiency. Moreover, the interference fit increases the contact area between the planetary gear 32 and the outer ring 332, enabling the load to be distributed more evenly. The uniform load distribution helps to improve the load-bearing capacity, enabling it to withstand greater torque and force.

[0053] Furthermore, an interference fit can prevent the planet gear 32 from slipping or rotating relative to the outer ring 332 during operation, thereby maintaining the stability of the mechanism, reducing vibration and noise, improving the working performance of the entire mechanism, reducing wear and fatigue, increasing the durability and lifespan of the entire mechanism, and reducing maintenance requirements. Moreover, using an interference fit can simplify the assembly process, reduce the number of required components, lower the assembly cost and time, and improve production efficiency.

[0054] Combined Figure 2 , in some embodiments, to ensure the stability of supporting the planet gear 22, the number of tapered roller bearings 33 is multiple. Along the axial direction of the planet shaft 31, the multiple tapered roller bearings 33 are arranged in parallel, which can significantly improve the overall radial load-bearing capacity of the planet shaft 31. Moreover, it can better balance the axial force and ensure the stable operation of the planetary gear set.

[0055] Combined Figure 2 , in some embodiments, along the axial direction of the planet shaft 31, to adjust the preload of the tapered roller bearings 33, the planetary gear set further includes: at least one adjusting member 40. At least one adjusting member 40 is disposed between the planet gear 32 and the planet shaft 31. Wherein, the adjusting member 40 is disposed between the outer rings 332 of two adjacent tapered roller bearings 33.

[0056] In some embodiments, according to the installation requirements, it is selected to set the adjusting member 40 between the outer rings 332 of two adjacent tapered roller bearings 33. By adjusting the thickness or number of the adjusting member 40, along the axial direction of the planet shaft 31, the distance between the outer rings 332 of two adjacent tapered roller bearings 33 is adjusted, along the axial direction of the planet shaft 31, the gap between the outer rings 332 of two adjacent tapered roller bearings 33 is adjusted, realizing the axial flexible design. By adjusting the gap between the outer rings 332 of two adjacent tapered roller bearings 33, the preload of a single tapered roller bearing 33 along the axial direction of the planet shaft 31 can be adjusted.

[0057] Furthermore, the adjusting member 40 can adjust the axial gap between the outer rings 332 of two tapered roller bearings 33. When the overall force is directed towards a certain planet gear 32, the axial gap between the outer rings 332 of two tapered roller bearings 33 can be converted into the radial gap between the outer ring 332 of a single tapered roller bearing 33 and the inner ring 331 of the tapered roller bearing 33, realizing the floating design of the planet gear 32. Wherein, the above-mentioned axial gap refers to the gap between the outer rings 332 of two tapered roller bearings 33 along the axial direction of the planet shaft 31, and the above-mentioned radial gap refers to the gap between the outer rings 332 of two tapered roller bearings 33 along the radial direction of the planet shaft 31.

[0058] In some embodiments, there are two tapered roller bearings 33 and one adjusting member 40. The adjusting member 40 is disposed between the outer rings 332 of the two tapered roller bearings 33. The spacing between the outer rings 332 of the two tapered roller bearings 33 is adjusted by the adjusting member 40 to adjust the gap between the outer rings 332 of the two adjacent tapered roller bearings 33 along the axial direction of the planetary shaft 31. By adjusting the gap between the outer rings 332 of the two adjacent tapered roller bearings 33 along the axial direction of the planetary shaft 31, the preload amount of a single tapered roller bearing 33 along the axial direction of the planetary shaft 31 can be adjusted.

[0059] In some embodiments, in order to facilitate the installation of the adjustment member 40, the adjustment member 40 is annular and does not require complicated positioning or fixing steps, thereby simplifying the installation process and reducing the installation time.

[0060] In some embodiments, along the axial direction of the planetary shaft 31, in order to enable the adjusting member 40 to adjust the axial preload of the tapered roller bearing 33, along the axial direction of the planetary shaft 31, the projection of the adjusting member 40 at least partially falls on the outer ring 332 of the bearing 33, and the projection of the adjusting member 40 at least partially falls on the inner ring 331 of the bearing 33, so that the adjusting member 40 can adjust the axial clearance between the outer rings 332 of the two tapered roller bearings 33 to achieve the adjustment of the axial preload of the tapered roller bearings 33.

[0061] Combination Figure 2 In order to facilitate the installation of the adjusting member 40, the planetary wheel 32 is provided with at least one positioning groove 321, and the adjusting member 40 is embedded in the corresponding positioning groove 321. When the adjusting member 40 is to be installed, the adjusting member 40 can be embedded in the positioning groove 321. The positioning groove 321 provides a clear installation position for the adjusting member 40, ensuring that the adjusting member 40 can be accurately and stably installed on the planetary wheel 32, avoiding position deviation during the installation process. Moreover, the design of the positioning groove 321 makes the installation of the adjusting member 40 simple and quick. The operator only needs to align the adjusting member with the positioning groove and embed it, without complicated positioning or fixing steps. At the same time, due to the guiding effect of the positioning groove 321, the operator may not need to use additional tools or equipment when installing the adjusting member 40, thereby reducing the installation cost, improving the installation efficiency of the adjusting member 40, reducing the installation time, and enabling the mechanical equipment to be put into production faster.

[0062] In some embodiments, after the adjusting member 40 is embedded in the positioning groove 321, the groove wall of the positioning groove 321 can clamp part of the adjusting member 40, the installation stability of the adjusting member 40 is enhanced, and it is not easy to loosen or fall off due to external factors (such as vibration, impact, etc.), thereby ensuring the normal operation of the planetary gearbox.

[0063] Figure 3 for Figure 1Schematic diagram of the structure of the carrier 10 of the intermediate planetary gear set. Figure 4 is Figure 3 Schematic diagram of the structure of the carrier 10 from another perspective. Figure 5 is Figure 4 Rear view of the carrier 10 of the intermediate planetary gear set. Combining Figure 2 、 Figure 3 、 Figure 4 and Figure 5 In order to install the planetary assembly 30, since the number of the planetary assemblies 30 is multiple, the carrier 10 is provided with a plurality of mounting holes 11, and the planetary shafts 31 of the plurality of planetary assemblies 30 are respectively inserted into the plurality of mounting holes 11, and the planetary shafts 31 of the corresponding planetary assemblies 30 are carried by the mounting holes 11 to ensure the stability of the installation of the planetary shafts 31 of the planetary assemblies 30.

[0064] In some embodiments, the plurality of planetary assemblies 30 are inserted into the plurality of mounting holes 11 of the carrier 10 through the planetary shafts 31, forming a distributed layout, which enables the entire planetary gear set to bear the load more evenly and improves the load-bearing capacity of the system.

[0065] Combining Figure 3 、 Figure 4 and Figure 5 In some embodiments, in order to ensure that the initial deformation amounts of the respective planet gears 32 are the same when the planetary gear set is loaded, the plurality of mounting holes 11 are arranged at equal angular intervals. That is to say, when the planetary shafts 31 of the plurality of planetary assemblies 30 are respectively inserted into the plurality of mounting holes 11, the planetary shafts 31 of the plurality of planetary assemblies 30 are also arranged at equal angular intervals. Then, the planet gears 32 sleeved on the planetary shafts 31 of the plurality of planetary assemblies 30 are also arranged at equal angular intervals, avoiding the uneven distribution of the flow caused by the inconsistent support stiffness readings of the respective planet gears 32 resulting in inconsistent deformations of the planetary shaft 31 during the same flow diversion process, and further resulting in inconsistent meshing states. The equal division design of the carrier 10 is realized, and it can be ensured that the initial deformation amounts of the respective planet gears 32 are the same when the system is loaded.

[0066] Combining Figure 3 、 Figure 4 and Figure 5 In some embodiments, in order to reduce the weight of the carrier 10, the carrier 10 is provided with a plurality of weight-reducing holes 12, so that the carrier 10 can significantly reduce its own weight on the basis of maintaining sufficient strength and stiffness, which helps to reduce the overall mass, achieve lightweight, reduce the inertial resistance, and improve the flexibility and response speed of the equipment. Moreover, due to the lightweight design of the carrier 10, after the carrier 10 reduces its weight, the driving force required for the equipment during operation is reduced, thereby reducing the energy consumption.

[0067] In some embodiments, in order to achieve weight reduction of the planet carrier 10, the planet carrier 10 includes: a body 13, a first end plate 14 and a second end plate 15. The first end plate 14 and the second end plate 15 are both connected to the body 13. The first end plate 14 and the second end plate 15 are respectively located on two opposite sides of the body 13. Among them, the first end plate 14 is provided with a plurality of weight reduction holes 12, and the weight reduction holes 12 are provided on the circumferential surface of the body 13, which can fully reduce the weight of the planet carrier 30, so that the planet carrier 10 can significantly reduce its own weight while maintaining sufficient strength and rigidity, which helps to reduce the overall mass, achieve lightweight, reduce inertial resistance, and improve the flexibility and response speed of the equipment.

[0068] In some embodiments, the first end plate 14 and the second end plate 15 are both provided with a plurality of mounting holes 11, and the plurality of mounting holes 11 on the first end plate 14 correspond one-to-one to the plurality of mounting holes 11 on the second end plate 15. The mounting holes 11 on the first end plate 14 are coaxially arranged with the corresponding mounting holes 11 on the second end plate 15 to facilitate the installation of the planetary shaft 31 and ensure the stability of the installation of the planetary shaft 31.

[0069] In some embodiments, the multiple weight-reducing holes 12 on the first end plate 14 are evenly spaced at equal angles, so that the first end plate 14 can distribute stress more evenly when bearing loads, avoiding the situation of excessive local stress, helping to maintain the overall structural balance of the first end plate 14 and improve its bearing capacity. Moreover, the evenly distributed weight-reducing holes make it difficult for the first end plate 14 to deform or twist when subjected to force, thereby improving its stability, ensuring the normal operation of the planetary carrier 10, and extending the service life of the planetary carrier 10. Among them, one of the multiple weight-reducing holes 12 on the first end plate 14 is located between two adjacent mounting holes 11 among the multiple mounting holes 11 on the first end plate 14, so as to facilitate the arrangement of the mounting holes 11 and the weight-reducing holes 12.

[0070] In some embodiments, the plurality of weight-reducing holes 12 on the second end plate 15 are evenly spaced at equal angles, so that the second end plate 15 can distribute stress more evenly when bearing a load, avoiding the situation of excessive local stress, helping to maintain the overall structural balance of the second end plate 15 and improve its bearing capacity. Moreover, the evenly distributed weight-reducing holes make it difficult for the second end plate 15 to deform or twist when subjected to stress, thereby improving its stability, ensuring the normal operation of the planet carrier 10, and extending the service life of the planet carrier 10.

[0071] In some embodiments, the main body 13 is provided with a plurality of weight-reducing holes 12, which can substantially reduce the weight of the planetary carrier 30, so that the planetary carrier 10 can significantly reduce its own weight while maintaining sufficient strength and rigidity, thereby helping to reduce the overall mass, achieve lightweight, reduce inertial resistance, and improve the flexibility and response speed of the equipment.

[0072] In some embodiments, the body 13, the first end plate 14, and the second end plate 15 can be integrally formed, which can eliminate the separate processing, splicing, and welding of multiple components, simplify the process, reduce the production cycle, reduce the loss of scrap and splicing materials. Moreover, there are no welds between the body 13, the first end plate 14, and the second end plate 15, avoiding the cracking risk caused by welding stress, significantly enhancing the anti-deformation ability, improving the structural strength between the body 13, the first end plate 14, and the second end plate 15, and then improving the structural strength of the planet carrier 10.

[0073] Of course, in some other embodiments, the body 13, the first end plate 14, and the second end plate 15 are all separate components, realizing the split design of the planet carrier 30, making the body 13, the first end plate 14, and the second end plate 15 exist independently and can be freely replaced. If a certain component fails, only this component needs to be replaced or repaired separately, without the need for overall disassembly, nor the need to replace the entire planet carrier 10, reducing the cost.

[0074] , combined with Figure 2 , in some embodiments, in order to ensure the smooth rotation of the sun gear 20, the planetary gear train further includes: a first bearing 50 and a second bearing 60. The first bearing 50 is arranged inside the planet carrier 10. The second bearing 60 is arranged inside the planet carrier 10 and is arranged side by side and spaced apart from the first bearing 50. Among them, the sun gear 20 passes through the first bearing 50 and the second bearing 60, and the planet gear 32 is located between the first bearing 50 and the second bearing 60.

[0075] The settings of the first bearing 50 and the second bearing 60 effectively reduce the friction and wear of the sun gear 20 during rotation. As a commonly used supporting component in machinery, the bearing can reduce the friction coefficient between the contact surfaces, enabling the sun gear 20 to rotate more smoothly. Due to the high manufacturing precision and assembly precision of the bearing, it can ensure that the sun gear 20 maintains a stable axis position during rotation, reducing vibration and noise, and improving the rotation accuracy and stability of the sun gear 20.

[0076] Since the first bearing 50 and the second bearing 60 are arranged side by side and spaced apart inside the planet carrier 10, the internal space of the planetary gear train can be fully utilized, not only making the structure more compact, but also helping to improve the transmission efficiency of the planetary gear train.

[0077] The settings of the first bearing 50 and the second bearing 60 disperse the load borne by the sun gear 20 during rotation. This helps to reduce the load borne by a single bearing and extend the service life of the bearing.

[0078] Since the planet gear 32 is located between the first bearing 50 and the second bearing 60, the stable position of the planet gear 32 during rotation can be maintained. The stable position of the planet gear 32 can ensure its correct meshing with the sun gear 20, improving the transmission efficiency.

[0079] In some embodiments, a chamber 16 is formed in the planet carrier 10, and the first bearing 50 and the second bearing 60 are arranged in the chamber 16. By accommodating the first bearing 50 and the second bearing 60 in the chamber 16, the stability of the installation of the first bearing 50 and the second bearing 60 can be ensured.

[0080] Combined Figure 2 , in some embodiments, in order to ensure smooth rotation of the planet carrier 10, the planetary gear train further includes: a third bearing 70. The third bearing 70 is sleeved on the planet carrier 10. The third bearing 70 serves as a supporting component between the planet carrier 10 and a fixed component (such as a housing), which can significantly reduce the frictional resistance of the planet carrier 10 during rotation. The rolling elements (such as balls or rollers) inside the third bearing 70 can effectively reduce the friction coefficient of the contact surface, enabling the planet carrier 10 to rotate more smoothly. Moreover, bearings generally have high manufacturing precision and assembly precision. Therefore, the use of the third bearing 70 can ensure that the planet carrier 10 maintains a stable axial position during rotation, improving the transmission precision of the planetary gear train and reducing vibration and noise.

[0081] Combined Figure 2 , in some embodiments, in order to further achieve load sharing, the planetary gear train further includes: an internal gear ring 80. The internal gear ring 80 meshes with the planet gear 32. Among them, the planet gear 32 is arranged between the internal gear ring 80 and the sun gear 20.

[0082] When there is a small axial resultant force due to factors such as machining and assembly, along the axial direction of the planet shaft 31, the planet gear 32 deviates from its set installation position. At this time, the tapered roller bearing 33 at the position where the planet gear 32 is located will pre-tightly support the planet gear 32. Due to the existence of a gap, the tapered roller bearing 33 far from the position where the planet gear 32 is located will have a cantilever, indicating that the planet gear 32 is skewed, resulting in uneven loading at the meshing positions of the planet gear 32 with the sun gear 20 and / or the internal gear ring 80. Along the radial direction of the planet shaft 31, the sun gear 20 and the internal gear ring 80 will exert certain forces on the planet gear 32. The planet gear 32 bears the acting forces of the sun gear 20 and the internal gear ring 80 respectively during operation. Theoretically, the acting force directions of the sun gear 20 and the internal gear ring 80 on the planet gear 32 are opposite and equal in magnitude. Under the interaction of the acting forces of the sun gear 20 and the internal gear ring 80 on the planet gear 32, the skew of the planet gear 32 can be corrected, realizing the automatic centering of the planet gear 32, and then achieving load sharing.

[0083] Based on the same inventive concept, the present application also provides a speed reducer, which adopts the planetary gear set. The specific structure of the planetary gear set refers to the above-mentioned embodiments. Since all the technical solutions of the above-mentioned embodiments are adopted, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated herein one by one.

[0084] Based on the same inventive concept, the present application also provides a vehicle, which adopts the speed reducer. The specific structure of the speed reducer refers to the above-mentioned embodiments. Since all the technical solutions of the above-mentioned embodiments are adopted, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated herein one by one.

[0085] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0086] In addition, in the present application, the descriptions such as "first" and "second" are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0087] In the description of the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0088] In the description of the present specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. 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 application. In the present specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification.

[0089] Although the preferred embodiments of the present application have been described, those of ordinary skill in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0090] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A planetary gear set, characterized in that, Comprising: Planet carrier; Sun gear, rotatably arranged within the planet carrier; At least one planetary assembly, including: planetary shaft, planetary gear and at least one tapered roller bearing, the planetary shaft penetrates through the planet carrier, the planetary gear is sleeved on the planetary shaft and meshes with the sun gear, and the tapered roller bearing is arranged between the planetary gear and the planetary shaft; Wherein, the tapered roller bearing includes an inner ring and an outer ring, the inner ring is connected to the planetary shaft, the outer ring is connected to the planetary gear, and there is a gap between the inner ring and the outer ring.

2. The planetary gear set according to claim 1, characterized in that, The number of the tapered roller bearings is multiple, and along the axial direction of the planetary shaft, the multiple tapered roller bearings are arranged in parallel.

3. The planetary gear set according to claim 2, characterized in that, The planetary gear set further includes: At least one adjusting member, arranged between the planetary gear and the planetary shaft; Wherein, the adjusting member is arranged between the outer rings of two adjacent tapered roller bearings.

4. The planetary gear set according to claim 3, wherein The planetary gear is provided with at least one positioning groove, and the adjusting member is embedded in the corresponding positioning groove.

5. The planetary gear set according to any one of claims 1-4, characterized in that, The number of the planetary assemblies is multiple, the planet carrier is provided with multiple mounting holes, and the planetary shafts of the multiple planetary assemblies respectively penetrate through the multiple mounting holes.

6. The planetary gear set according to claim 5, wherein The multiple mounting holes are arranged at equal angles and evenly spaced.

7. The planetary gear set according to any one of claims 1-4, characterized in that, The planet carrier is provided with multiple weight reduction holes.

8. The planetary gear set according to any one of claims 1-4, characterized in that, The planetary gear set further includes: Ring gear, meshing with the planetary gear; Wherein, the planetary gear is arranged between the ring gear and the sun gear.

9. A speed reducer, characterized in that, Including the planetary gear set according to any one of claims 1-8.

10. A vehicle, characterized in that, Including the reducer according to any one of claim 9.

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