Planet carrier assembly for speed reducer and speed reducer

Abstract

The planet carrier assembly comprises a planet carrier, the planet carrier is provided with a disc-shaped carrier body and a planet carrier shaft protruding from the disc-shaped carrier body in the axial direction, and the planet carrier shaft is provided with a first side close to a power input mechanism and a second side away from the power input mechanism; the sun gear is arranged on the outer side of the planet carrier shaft in a sleeving manner and is connected with the planet carrier shaft in an anti-rotation manner; the first locking piece is limited relative to the planet carrier shaft in the axial direction, and the first side of the planet carrier shaft abuts against the sun gear. The second locking piece is limited relative to the planet carrier shaft in the axial direction, and the second side of the planet carrier shaft abuts against the sun gear. According to the embodiment of the invention, the sun gear is limited by the first locking piece and the second locking piece in the axial direction, the axial displacement of the sun gear can be controlled, the positioning stability is improved compared with a traditional boss clamping scheme, and the meshing unbalance loading risk of a planetary gear train is effectively reduced.

Description

Technical Field

[0001] This disclosure generally relates to the field of speed reducer technology. More specifically, this disclosure relates to a planetary carrier assembly for a speed reducer and a speed reducer. Background Technology

[0002] Planetary gearboxes are widely used in wind power generation, construction machinery, and other fields. The axial floating limit structure of the sun gear in the planetary carrier assembly, a core component, directly affects transmission efficiency and reliability. Existing technologies commonly employ a scheme where an annular boss in the sun gear's inner hole engages with a groove in the planetary carrier's spacer ring to achieve axial limiting. However, this boss-clamping scheme requires high machining precision for the fit between the boss and the groove, necessitates precise alignment of multiple components during installation, is cumbersome, requires additional adjustment of the boss clamping clearance, and is complex to assemble. Furthermore, the boss structure alters the overall strength distribution of the sun gear, easily leading to stress concentration and fatigue damage, and resulting in low overall positioning stability.

[0003] In view of this, there is an urgent need to provide a planetary carrier assembly and a reducer for a speed reducer, so as to realize the control of the axial displacement of the sun gear, improve the positioning stability compared with the traditional boss clamping scheme, and effectively reduce the risk of off-center meshing of the planetary gear train. Summary of the Invention

[0004] In order to at least address one or more of the technical problems mentioned above, this disclosure provides, in several aspects, a planetary carrier assembly for a speed reducer and a speed reducer.

[0005] In a first aspect, this disclosure provides a planetary carrier assembly for a speed reducer, comprising: a planetary carrier having a disc-shaped carrier body and a planetary carrier shaft axially projecting from the disc-shaped carrier body, the planetary carrier shaft having a first side adjacent to a power input mechanism and a second side distant from the power input mechanism; a sun gear sleeved on the outside of the planetary carrier shaft and anti-rotationally connected to the planetary carrier shaft; a first locking member axially limiting relative to the planetary carrier shaft and abutting the sun gear from the first side of the planetary carrier shaft; and a second locking member axially limiting relative to the planetary carrier shaft and abutting the sun gear from the second side of the planetary carrier shaft.

[0006] In some embodiments, the first locking member includes a sun gear baffle, which is fixedly disposed on the end face of the first side of the planetary carrier shaft.

[0007] In some embodiments, an end-positioning structure is provided on the end face of the first side of the planetary carrier shaft, the sun gear baffle engages with the end-positioning structure, and forms a positioning with the end-positioning structure along the axial direction of the planetary carrier shaft.

[0008] In some embodiments, the side of the sun gear facing the sun gear baffle is further provided with a baffle limiting groove recessed along the axial direction, and the sun gear baffle can be at least partially accommodated in the baffle limiting groove.

[0009] In some embodiments, the sun gear baffle is fixedly connected to the planet carrier by bolts.

[0010] In some embodiments, the second locking member includes a sun gear retaining ring, which is sleeved on the outer periphery of the planetary carrier shaft.

[0011] In some embodiments, the planetary carrier shaft is further provided with a retaining ring limiting step formed by a radial indentation, and the sun gear retaining ring is engaged with the bottom surface of the retaining ring limiting step and abuts against the vertical end face of the retaining ring limiting step.

[0012] In some embodiments, the planetary carrier shaft is further provided with a radially extending locating pin, and the sun gear retainer ring is provided with a locating groove corresponding to the locating pin, so that the locating groove of the sun gear retainer ring can form an anti-rotation positioning with the radially extending locating pin.

[0013] In some embodiments, the planet carrier shaft is provided with a radially protruding positioning shoulder, the sun gear retainer ring is disposed on the radially outer side of the positioning shoulder, and the sun gear retainer ring protrudes toward the sun gear relative to the positioning shoulder along the axial direction of the planet carrier shaft.

[0014] In some embodiments, the sun gear retainer ring and the planet carrier shaft are interference-fitted.

[0015] In a second aspect, this disclosure provides a speed reducer including a planetary carrier assembly for the speed reducer according to the first aspect and several embodiments.

[0016] With the planetary carrier assembly and reducer provided above, the embodiments disclosed herein, by setting a sun gear on the planetary carrier shaft of the planetary carrier and setting a first locking member and a second locking member on both sides of the sun gear, and simultaneously limiting the sun gear along the axial direction with the first locking member and the second locking member, can realize the control of the axial displacement of the sun gear. Compared with the traditional boss clamping scheme, it improves the stability of positioning and effectively reduces the risk of off-center meshing of the planetary gear system. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 An exemplary partial cross-sectional view of a speed reducer according to some embodiments of this disclosure is shown; Figure 2 It shows Figure 1 An exemplary enlarged view of a planetary carrier assembly portion for a speed reducer; Figure 3 It shows Figure 2A magnified view of part A in the middle; Figure 4 It shows Figure 2 A magnified view of part B in the middle section. Detailed Implementation

[0018] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0019] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0020] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0021] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0022] This disclosure provides a planetary carrier assembly for a speed reducer. By setting a sun gear on the planetary carrier shaft and setting a first locking member and a second locking member on both sides of the sun gear, the first locking member and the second locking member limit the sun gear along the axial direction, thereby controlling the axial displacement of the sun gear. Compared with the traditional boss clamping scheme, this improves the stability of positioning and effectively reduces the risk of off-center meshing of the planetary gear system.

[0023] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0024] See Figure 1 and Figure 2 , Figure 1 An exemplary partial cross-sectional view of a speed reducer according to some embodiments of this disclosure is shown. Figure 2 It shows Figure 1 An exemplary enlarged view of the planetary carrier assembly portion for a speed reducer.

[0025] In this embodiment, the reducer 200 employs a planetary gear set structure for speed reduction, wherein the planetary gear set includes a planetary carrier assembly 100 for the reducer according to some embodiments of this disclosure. The planetary carrier assembly 100 for the reducer includes a planetary carrier 6, a sun gear 4, a first locking member, and a second locking member. The planetary carrier 6 has a disc-shaped carrier body 61 and a planetary carrier shaft 62 protruding axially from the carrier body. The planetary carrier shaft 62 has a first side near the power input mechanism and a second side away from the power input mechanism. The sun gear 4 is sleeved on the outside of the planetary carrier shaft 62 and is anti-rotationally connected to the planetary carrier shaft 62. The first locking member is axially positioned relative to the planetary carrier shaft 62 and abuts against the sun gear 4 from the first side of the planetary carrier shaft 62. The second locking member is axially positioned relative to the planetary carrier shaft 62 and abuts against the sun gear 4 from the second side of the planetary carrier shaft 62.

[0026] Specifically, the reducer 200 can employ a multi-stage planetary gear set for acceleration. The planet carrier 6 provides a support for the planetary gears, engaging with the sun gear or other gears via multiple planetary gears and connecting to other components via its central shaft, thereby transmitting driving force and adjusting the output speed. The planetary carrier shaft 62 connects to and supports the sun gear 4, while the disc-shaped carrier body 61 connects to multiple planetary gears to support their rotation. The disc-shaped carrier body 61 and the planetary carrier shaft 62 are fixed together by integral molding or welding, forming a rigid connection structure. The sun gear 4 is connected to the corresponding spline structure on the outer circumference of the planetary carrier shaft 62 via anti-rotation structures such as splines, ensuring synchronous rotation. The first and second locking components are fixed to the planetary carrier shaft 62 via axial limiting structures, providing bidirectional axial limiting from both sides of the sun gear 4. Thus, the first and second locking members arranged on both sides of the sun gear 4 along the planetary carrier shaft 62 form a bidirectional limiting structure for the sun gear 4, which stably and reliably limits the axial displacement of the sun gear 4, significantly improves the positioning accuracy and transmission stability of the component, and reduces the impact and noise during gear meshing.

[0027] See Figures 1 to 3 , Figure 3 It shows Figure 2 A partially enlarged view of part A. In this embodiment, the first locking member includes a sun gear baffle 3, which is fixedly disposed on the end face of the first side of the planetary carrier shaft 62. Wherein, in... Figure 3 In the illustrated embodiment, the sun gear baffle 3 is formed into a generally annular plate shape, with its outer diameter larger than the inner diameter of the sun gear 4, to ensure that the sun gear baffle 3 can axially fit and abut against the sun gear 4. Furthermore, multiple through holes are provided on the sun gear baffle 3, and multiple corresponding threaded holes are provided on the end face of the first side of the planetary carrier shaft 62. Thus, the sun gear baffle 3 can be fastened to the end face of the first side of the planetary carrier shaft 62 using bolts. Those skilled in the art will understand that in some embodiments not shown, the sun gear baffle 3 may also adopt a disc-shaped or other plate-like structure, and it can be fixedly connected to the end face of the first side of the planetary carrier shaft 62 by interference fit, welding, or other methods. By providing a sun gear baffle 3 fixed to the end face of the planetary carrier shaft 62, the axial space occupied by this axial limiting structure is smaller, which is beneficial for the compact design of the reducer.

[0028] Further or optionally, a shaft end positioning structure 67 is provided on the end face of the first side of the planetary carrier shaft 62. The sun gear baffle 3 engages with the shaft end positioning structure 67 and forms a positioning with the shaft end positioning structure 67 along the axial direction of the planetary carrier shaft 62. The shaft end positioning structure 67 can be a stepped surface, an annular positioning groove, a positioning pin hole, or a keyway, etc., with corresponding protrusions, claws, positioning pins, or keys on the sun gear baffle 3. Through the cooperation of the sun gear baffle 3 and the positioning structure on the shaft end, the baffle and the planetary carrier shaft 62 can be positioned in the axial and / or circumferential directions. By setting the shaft end positioning structure 67, the positioning accuracy of the sun gear baffle 3 and the planetary carrier shaft 62 can be improved without adding additional positioning components. Furthermore, the engagement of the sun gear baffle 3 and the shaft end positioning structure 67 reduces the vibration and displacement of the sun gear baffle 3 during transmission, thereby reducing wear during operation and extending the service life of the sun gear baffle 3.

[0029] In this embodiment, the side of the sun gear 4 facing the sun gear baffle 3 is also provided with an axially recessed baffle limiting groove 40, which at least partially accommodates the sun gear baffle 3. The shape and depth of the baffle limiting groove 40 can match the shape and size of the sun gear baffle 3. For example, when the outer contour of the sun gear baffle 3 is circular, the baffle limiting groove 40 can be set to be a circle that matches or is slightly larger than the diameter of the baffle. After the sun gear baffle 3 is embedded in the baffle limiting groove 40, its groove wall is in contact with or close to the outer peripheral surface and end face of the baffle. On the one hand, this can further limit the radial displacement of the baffle. On the other hand, the solar baffle embedded in the baffle limiting groove 40 can provide a shielding and protective function for the connection between the sun gear 4 and the planetary carrier shaft 62, reducing the probability of foreign objects entering the connection and improving the structural sealing. In addition, this embedded structure shortens the total axial length of the component, enabling a more compact layout.

[0030] See also Figures 1 to 2and Figure 4 , Figure 4 It shows Figure 2 A partially enlarged view of part B. In this embodiment, the second locking member includes a sun gear retaining ring 5, which is sleeved on the outer circumference of the planetary carrier shaft 62. The sun gear retaining ring 5 can be formed as a steel ring, with its inner ring fitting against the outer circumferential surface or other positioning surface of the planetary carrier shaft 62. The side end face of the sun gear retaining ring 5 facing the first side of the planetary carrier shaft 62 abuts against the end face of the sun gear 4 facing the second side of the planetary carrier shaft 62, so as to form a bidirectional axial limit on the sun gear 4 together with the first locking member on the first side. By setting the second locking member as a ring structure, the axial force of the sun gear retaining ring 5 on the sun gear 4 is evenly distributed along the circumference, reducing the probability of the locking member being misaligned or even deformed due to uneven force distribution during operation. The sun gear retaining ring 5 can be simply installed on the outer circumference of the planetary carrier shaft 62 by sleeve along the planetary carrier shaft 62, which is simple and convenient for disassembly and maintenance of the component. When the first locking element includes a circular or annular sun gear baffle 3, the sun gear retaining ring 5 and the sun gear baffle 3 form a symmetrical layout in structure, which makes the axial force on the sun gear 4 more balanced, further improving the stability in the transmission process and reducing the possibility of locking element failure or misalignment.

[0031] Further or optionally, the planetary carrier shaft 62 is also provided with a radially recessed retaining ring limiting step 68. The sun gear retaining ring 5 is engaged with the bottom surface of the retaining ring limiting step 68 and abuts against the vertical end face of the retaining ring limiting step 68. The retaining ring limiting step 68 can be configured as an annular recessed step on the outer circumference of the planetary carrier shaft 62. The retaining ring limiting step 68 has a radially recessed bottom surface and an end face that extends vertically outward from the second side of the bottom surface and faces the first side. The distance from this end face to the end face of the sun gear 4 facing the second side can be adapted to the thickness of the sun gear retaining ring 5. The sun gear retaining ring 5 is fitted on the radially outer side of the bottom surface by means of interference fit or other methods. The end face of the retaining ring limiting step 68 forms an axial limit on the end face of the second side of the sun gear retaining ring 5. Thus, the retaining ring limiting step 68 provides precise axial positioning for the retaining ring, enabling the retaining ring to withstand large axial loads and effectively preventing the sun gear retaining ring 5 from axially shifting under high-speed transmission or impact loads. Meanwhile, the retaining ring limiting step 68 is easy to process and makes the installation position of the sun gear retaining ring 5 precise and controllable, thereby improving the axial assembly accuracy of the sun gear 4.

[0032] Further or optionally, the planetary carrier shaft 62 is also provided with a radially extending locating pin 8, and the sun gear retaining ring 5 is provided with a locating groove 50 corresponding to the radially extending locating pin 8, so that the locating groove 50 of the sun gear retaining ring 5 can form an anti-rotation positioning with the radially extending locating pin 8. The radially extending locating pin 8 can be provided, for example, on the bottom surface of the retaining ring limiting step 68, and the locating groove 50 can be provided on the radially inner side of the sun gear retaining ring 5 and open towards the second side of the planetary carrier shaft 62. The locating pin 8 is partially embedded in the bottom surface of the retaining ring limiting step 68 radially along the planetary carrier shaft 62, and its exposed end forms a clearance fit or an interference fit with the locating groove 50 on the sun gear retaining ring 5. Those skilled in the art will understand that multiple locating grooves 50 can be provided along the circumference of the retaining ring, and one or more corresponding locating pins 8 can also be provided on the planetary carrier shaft 62. The engagement of the locating pin 8 with the locating groove 50 restricts the circumferential rotation of the sun gear retaining ring 5, forming a circumferential fixation. This reduces the circumferential movement of the sun gear retaining ring 5 due to friction during transmission, reduces wear between the sun gear retaining ring 5 and the planetary carrier shaft 62, and extends its service life.

[0033] Therefore, compared to the sun gear limiting scheme in the prior art, in the planetary carrier assembly according to some embodiments of this disclosure, the sun gear baffle 3 is fixed to the low-speed end by bolts, and the sun gear retaining ring 5 is installed at the high-speed end by an interference fit, supplemented by a locating pin 8 for circumferential anti-rotation. This active and rigid limiting method fundamentally avoids the failure risk caused by circumferential ring dislodgement or wear, significantly improving the reliability and stability of the limiting. Furthermore, compared to the existing technical solution with an annular boss having an inner hole for the sun gear, the design scheme according to some embodiments of this disclosure adopts a highly modular design. The sun gear baffle 3 (bolted connection) and the sun gear retaining ring 5 (interference fit, but detachable) are both independent components. When maintenance or replacement is required, these two limiting components can be operated separately without disassembling the entire planetary gear train core assembly. This design significantly shortens maintenance time, reduces maintenance costs, and lowers the risk of secondary damage caused by complex disassembly and assembly.

[0034] Further or optionally, the planetary carrier shaft 62 is provided with a radially protruding positioning shoulder 69, and the sun gear retaining ring 5 is located radially outside the positioning shoulder 69, with the sun gear retaining ring 5 protruding towards the sun gear 4 relative to the positioning shoulder 69 along the axial direction of the planetary carrier shaft 62. The positioning shoulder 69 is a structure formed on the planetary carrier shaft 62 that protrudes radially relative to anti-rotation connection structures such as splines. When a retaining ring limiting step 68 is provided, its radially outer peripheral surface is the bottom surface of the retaining ring limiting step 68. The outer peripheral surface of the positioning shoulder 69 fits against the radially inner surface of the sun gear retaining ring 5, and the end face of the sun gear retaining ring 5 facing the first side protrudes relative to the end face of the positioning shoulder 69 facing the first side, and abuts against the second end face of the sun gear 4. By setting the positioning shoulder 69 and making the sun gear retaining ring 5 protrude towards the sun gear 4 relative to the positioning shoulder 69 along the axial direction of the planetary carrier shaft 62, the sun gear retaining ring 5 can pass over the process residue area on the planetary carrier shaft 62 around the spline and other structures, and directly abut against the end face of the sun gear 4. This allows for precise control of the limiting position, improves the consistency of production and processing, and reduces production and maintenance costs.

[0035] Furthermore, or optionally, the sun gear retaining ring 5 and the planetary carrier shaft 62 form an interference fit. This can be achieved by designing the inner diameter of the sun gear retaining ring 5 to be slightly smaller than the outer diameter of the planetary carrier shaft 62. During assembly, the retaining ring can be pressed into place using a press or by thermal expansion and contraction to ensure a tight fit between the retaining ring and the shaft surface, forming a rigid connection. By creating an interference fit between the sun gear retaining ring 5 and the planetary carrier shaft 62, the connection strength and sealing performance between the retaining ring and the planetary carrier shaft 62 can be improved, preventing lubricant leakage and impurities from entering the mating surfaces.

[0036] The planetary carrier assembly for a speed reducer disclosed in some embodiments features a sun gear 4 mounted on the planetary carrier shaft 62 of the planetary carrier 6. A first locking member and a second locking member are respectively mounted on both sides of the sun gear 4, simultaneously limiting the axial displacement of the sun gear 4 by the first and second locking members. This enables control of the axial displacement of the sun gear 4, improving positioning stability compared to traditional boss clamping schemes and effectively reducing the risk of off-center meshing in the planetary gear system. Furthermore, compared to the traditional design of mounting a boss structure on the sun gear 4 body, this allows for a process conversion from gear shaping to gear milling in spline machining, increasing machining efficiency by 7-8 times and significantly reducing tool wear and manufacturing costs.

[0037] Furthermore, in embodiments equipped with a sun gear baffle 3, a sun gear retaining ring 5, and a locating pin 8, the assembly process of the planetary carrier assembly can be reduced by designing a modular positioning component consisting of the sun gear baffle 3, the sun gear retaining ring 5, and the locating pin 8. For embodiments where the sun gear retaining ring 5 is interference-fitted with the planetary carrier shaft 62 and a locating pin 8 is designed, the assembly process can be simplified, eliminating the need for precise alignment. Compared to traditional boss clamping schemes, some embodiments disclosed herein reduce the risk of local stress concentration by eliminating the boss on the sun gear 4 body, while the interference fit of the sun gear retaining ring 5 improves fatigue resistance. The interference fit of the sun gear retaining ring 5 and the locating pin 8 form a composite anti-rotation mechanism, ensuring that the circumferential displacement of the retaining ring is ≤0.005 rad. This significantly improves the anti-rotation reliability compared to a single interference connection scheme, avoiding fretting wear under complex gearbox operating conditions.

[0038] Furthermore, in some of the above embodiments, both the sun gear baffle 3 and the sun gear retaining ring 5 are configured to be axially fitted onto corresponding positions on the planetary carrier shaft 62, allowing both the sun gear baffle 3 and the sun gear retaining ring 5 to be axially detachable. This design enables independent maintenance of the sun gear 4 axial positioning system, reducing maintenance and replacement time by 60%, and eliminating the need to disassemble the core components of the planetary gear system, thus reducing the probability of secondary damage during maintenance. In traditional boss clamping schemes, the inner diameter of the boss structure is 25-30mm lower than that of the spline on one side, resulting in a heavier sun gear blank. Furthermore, this area needs to be machined in the finished product, leaving only the boss structure, which reduces the material utilization rate of the blank and increases its cost. However, by comprehensively utilizing the designs in the above embodiments and optimizing the overall structure, the total mass of the planetary carrier assembly can be reduced by 15%-18%, material costs can be lowered, and combined with the economies of scale of milling processes, the overall manufacturing cost is reduced by 30%-35% compared to the original solution.

[0039] See you again Figure 1 Some embodiments of this disclosure also provide a speed reducer, which includes a planetary carrier assembly 100 for a speed reducer according to various embodiments of this disclosure, a housing 1, an upper planetary carrier 2 disposed in the housing 1, etc.

[0040] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A planetary carrier assembly for a speed reducer, characterized by, The application relates to a planetary carrier assembly for a reduction machine. The planetary carrier (6) has a disc-shaped carrier body (61) and a planetary carrier shaft (62) protruding from the disc-shaped carrier body (61) in the axial direction, the planetary carrier shaft (62) having a first side close to a power input mechanism and a second side away from the power input mechanism; The sun gear (4) is sleeved outside the planetary carrier shaft (62) and is connected with the planetary carrier shaft (62) in a rotation-preventing manner; The first locking member is positioned in the axial direction relative to the planetary carrier shaft (62) and abuts against the sun gear (4) from the first side of the planetary carrier shaft (62); The second locking member is positioned in the axial direction relative to the planetary carrier shaft (62) and abuts against the sun gear (4) from the second side of the planetary carrier shaft (62).

2. The planet carrier assembly of claim 1, wherein, The first locking member comprises a sun gear baffle (3) fixedly arranged on the end face of the first side of the planetary carrier shaft (62).

3. The planet carrier assembly of claim 2, wherein The end face of the first side of the planetary carrier shaft (62) is provided with an axial end positioning structure (67), the sun gear baffle (3) is engaged with the axial end positioning structure (67) and is positioned with the axial end positioning structure (67) in the axial direction of the planetary carrier shaft (62).

4. The planet carrier assembly of claim 2 or 3, wherein, The side of the sun gear (4) facing the sun gear baffle (3) is further provided with a baffle limiting groove (40) recessed in the axial direction, and the sun gear baffle (3) can be at least partially accommodated in the baffle limiting groove (40).

5. The planet carrier assembly of claim 2 or 3, wherein, The sun gear baffle (3) is fixedly connected with the planetary carrier (6) through bolts.

6. The planetary carrier assembly of claim 1, wherein, The second locking member comprises a sun gear baffle ring (5) sleeved outside the outer periphery of the planetary carrier shaft (62).

7. The planetary carrier assembly of claim 6, wherein, The planetary carrier shaft (62) is further provided with a baffle ring limiting step (68) recessed in the radial direction, and the sun gear baffle ring (5) is clamped on the bottom face of the baffle ring limiting step (68) and abuts against the vertical end face of the baffle ring limiting step (68).

8. The planetary carrier assembly of claim 6, wherein, The planetary carrier shaft (62) is further provided with a positioning pin (8) extending in the radial direction, and the sun gear baffle ring (5) is provided with a positioning groove (50) corresponding to the positioning pin (8), so that the positioning groove (50) of the sun gear baffle ring (5) can be positioned in a rotation-preventing manner with the positioning pin (8) extending in the radial direction.

9. The planetary carrier assembly of claim 6, wherein, The planetary carrier shaft (62) is provided with a positioning boss (69) protruding in the radial direction, the sun gear baffle ring (5) is arranged on the radial outside of the positioning boss (69), and the sun gear baffle ring (5) protrudes towards the sun gear (4) relative to the positioning boss (69) in the axial direction of the planetary carrier shaft (62).

10. The planet carrier assembly of any one of claims 6-9, wherein, The sun gear baffle ring (5) is in interference fit with the planetary carrier shaft (62).

11. A speed reducer characterized by comprising: The application further relates to a planetary carrier assembly for a reduction machine according to any one of claims 1 to 10.

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