Planetary speed reducing mechanism of speed reducer

Abstract

The utility model relates to the technical field of speed reducers, in particular to a planetary speed reducing mechanism of a speed reducer. The planetary speed reducing mechanism of the speed reducer is installed in an integrated speed reducer, the integrated speed reducer comprises a worm wheel shaft and an output shaft, the output shaft comprises a first shaft and a second shaft which are connected, a hole for the second shaft to penetrate through is formed in the worm wheel shaft in the axis direction of the worm wheel shaft, and the worm wheel shaft is connected with the second shaft. Comprising an outer ring shell, a gear ring, a sun gear, a plurality of planet gears, a planet carrier, a first connecting mechanism and a second connecting mechanism, wherein the gear ring is coaxially arranged on the inner wall of the outer ring shell. The planet carrier and the first shaft are detachably connected through the second connecting mechanism, so that when a worm gear is seriously abraded or a sun gear in the planet gear speed reducing mechanism is seriously abraded and needs to be replaced, the sun gear and the worm gear shaft can be conveniently and rapidly disassembled, the worm gear and the planet gear speed reducing mechanism do not need to be disassembled together, and the work efficiency is improved. Subsequent maintenance and replacement are facilitated, and cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a planetary reduction mechanism of a reducer. Background Art

[0002] In situations where low-speed, high-torque transmission is required, such as when starting equipment with a heavy load, a high-torque reduction motor is needed to provide sufficient starting torque. The speed ratio of a reducer is directly proportional to the torque: the larger the reduction ratio, the greater the output torque; conversely, the smaller the reduction ratio, the smaller the output torque. Current worm gear reducers primarily consist of a worm wheel and a worm, utilizing the meshing between the worm wheel and the worm to achieve deceleration. This reliance on the meshing between the worm wheel and the worm for single-stage reduction results in limited load-bearing capacity. While they can withstand heavy loads to a certain extent, their transmission method prevents them from easily starting heavy-load equipment. To address this issue, our company has designed an integrated reducer with a dual-stage worm gear and planetary reduction system.

[0003] like Figure 8 As shown, this integrated reducer includes a housing 1', a worm gear 2', a worm, an output shaft, and a planetary gear reduction mechanism 4'. The worm gear 2' includes a worm gear shaft 201' and multiple cylindrical rollers mounted on the worm gear shaft 201'. The worm gear 2' and the worm utilize a roller-envelope drive mechanism. The output shaft includes a first shaft 301' and a second shaft 302'. The planetary gear reduction mechanism 4 includes a ring gear 402', a sun gear 403', planetary gears 401', a planetary carrier 404', and an outer ring housing. The end faces of the worm gear shaft 201' and the sun gear 403 are welded. Holes are provided in the worm gear shaft 201' and the sun gear 403' for the second shaft 302' to pass through. One end of the first shaft 301' is welded to the planetary carrier 404', while one end of the second shaft 302' passes through the worm gear shaft 201' and the sun gear 403' and is welded to the other end face of the planetary carrier 404'. The planetary gear reduction mechanism 4' used in the above integrated reducer is different from a conventional planetary gear reduction mechanism only in that a circular hole is provided on the sun gear 403'. Therefore, a conventional planetary gear reduction mechanism can be simply processed and installed in the integrated reducer for use.

[0004] However, in subsequent work on this integrated reducer, the staff found that once the planetary gear reduction mechanism 4' or the worm gear mechanism fails and needs to be repaired or replaced, the entire planetary gear reduction mechanism 4' and the worm gear mechanism can only be removed and replaced together, resulting in high subsequent maintenance costs. Utility Model Content

[0005] (1) The problem to be solved by the present invention is that in the above-mentioned integrated reducer, once the planetary gear reduction mechanism or the worm gear mechanism fails and needs to be repaired or replaced, the entire planetary gear reduction mechanism and the worm gear mechanism can only be removed together for replacement, resulting in high subsequent maintenance costs.

[0006] (2) Technical solution

[0007] A planetary reduction mechanism for a reducer, installed in an integrated reducer, comprising a worm gear shaft and an output shaft, wherein the output shaft comprises a first shaft and a second shaft connected to each other, and a hole is provided on the worm gear shaft along its axis for the second shaft to pass through, and the integrated reducer comprises an outer ring housing, a ring gear, a sun gear, a plurality of planetary gears, a planet carrier, a first connecting mechanism, and a second connecting mechanism;

[0008] The ring gear is coaxially arranged on the inner wall of the outer ring housing, the sun gear is centrally arranged at the center of the ring gear, the plurality of planetary gears are respectively engaged with the ring gear and the sun gear, and the plurality of planetary gears are connected by the planet carrier;

[0009] The planet carrier is provided with a first circular hole for the second shaft to pass through, and the sun gear is provided with a second circular hole for the second shaft to pass through;

[0010] The sun gear is detachably connected to the worm gear shaft via the first connecting mechanism; the planet carrier is detachably connected to the shaft 1 via the second connecting mechanism.

[0011] According to one embodiment of the present invention, the sun gear includes an integrally formed sun gear cylinder and sun gear meshing teeth, the sun gear meshing teeth are evenly arranged on the outer circumferential surface of the sun gear cylinder around the axis of the sun gear cylinder, and the cylinder cavity of the sun gear cylinder forms the second circular hole.

[0012] According to one embodiment of the present invention, the first connecting mechanism includes a flange connecting ring coaxially arranged on the worm gear shaft and a sun gear fixing flange arranged on the sun gear, the sun gear fixing flange is arranged at one end of the sun gear cylinder close to the worm gear shaft, and the sun gear fixing flange and the flange connecting ring are connected by bolts.

[0013] According to an embodiment of the present invention, the sun gear fixing flange and the sun gear cylinder are integrally formed.

[0014] According to one embodiment of the present invention, the sun gear fixing flange extends out from the outer ring housing.

[0015] According to one embodiment of the present invention, the second connecting mechanism includes a connecting piece installed on the end face of the planetary carrier and a fixed flange ring installed on the shaft one, and the second connecting mechanism includes a first flange plate, a tube body and a second flange plate connected in sequence, the first flange plate is connected to the end face of the planetary carrier by bolts, and the second flange plate is connected to the fixed flange ring by bolts.

[0016] According to an embodiment of the present invention, the first flange, the tube body and the second flange are integrally formed.

[0017] According to one embodiment of the present invention, a fixed rotating shaft is installed on the same end face of the planetary gear, and the planetary carrier is provided with mounting holes corresponding to the planetary gears one by one. A bearing is provided on the inner wall of each mounting hole, and the inner ring of the bearing is interference fit with the corresponding fixed rotating shaft.

[0018] Beneficial effects of the utility model:

[0019] The planet carrier and shaft one are detachably connected by the second connecting mechanism. In this way, when the worm gear is severely worn or the sun gear in the planetary gear reduction mechanism is severely worn and needs to be replaced, the sun gear and worm gear shaft can be easily and quickly disassembled without having to remove the entire worm gear and planetary gear reduction mechanism together, which is convenient for subsequent maintenance and replacement and saves costs. The planet carrier and shaft one are detachably connected by the second connecting mechanism, so that the output shaft and the planetary gear reduction mechanism are independent of each other, and the output shaft and the planetary gear reduction mechanism are easy to install and disassemble, which is convenient for subsequent maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A structural diagram of a planetary gear reduction mechanism and an output shaft provided in Example 1 of the present utility model;

[0022] Figure 2 A top view of a planetary gear reduction mechanism provided in an embodiment of the present utility model;

[0023] Figure 3 The embodiment of the present invention provides Figure 2 Cross-sectional view of AA;

[0024] Figure 4 This is a first structural diagram of the integrated reducer provided in the second embodiment of the present utility model;

[0025] Figure 5 The second embodiment of the present invention provides Figure 4 Cross-sectional view of AA;

[0026] Figure 6 A second structural diagram of the integrated reducer provided in the second embodiment of the present utility model;

[0027] Figure 7 The embodiment of the present invention provides Figure 6 Cross-sectional view of the middle BB;

[0028] Figure 8 This is a cross-sectional view of an integrated reducer with a conventional worm gear + planetary reduction double-stage reduction.

[0029] Icons: 1. Housing; 2. Worm gear; 201. Worm gear shaft; 3. Output shaft; 301. Shaft 1; 302. Shaft 2; 4. Planetary gear reduction mechanism; 401. Planetary gear; 402. Ring gear; 403. Sun gear; 404. Planet carrier; 405. Outer ring housing; 406. Sun gear cylinder; 407. Sun gear meshing teeth; 408. Sun gear fixing flange; 409. Sun gear cylinder cavity; 410. Connector; 411. Tube; 412. First Flange; 413, second flange; 414, fixed shaft; 5, outer bearing; 6, inner bearing; 7, first bearing; 8, first oil seal end cover; 9, first oil seal; 10, first bearing seat; 11, second bearing seat; 12, second bearing; 13, second oil seal; 14, lower housing; 15, worm; 16, third bearing seat; 17, third bearing; 18, third oil seal; 19, seal end cover; 20, fourth bearing; 21, second oil seal end cover. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1:

[0032] like Figure 1-Figure 3 As shown, the first embodiment of the present invention provides a planetary reduction mechanism for a reducer, which is installed in an integrated reducer. The integrated reducer is as shown in FIG. Figure 4 and Figure 5As shown, it includes a worm gear shaft 201 and an output shaft 3, the output shaft 3 includes a connected shaft 1 301 and a shaft 2 302, a hole for the shaft 2 302 to pass through is opened on the worm gear shaft 201 along its axial direction, and the planetary gear reduction mechanism includes an outer ring housing 405, a ring gear 402, a sun gear 403, multiple planetary gears 401, a planet carrier 404, a first connecting mechanism and a second connecting mechanism; the ring gear 402 is coaxially arranged on the inner wall of the outer ring housing 405, and the sun gear 403 is centrally arranged on the ring gear 4 02, multiple planetary gears 401 are respectively engaged with the ring gear 402 and the sun gear 403, and the multiple planetary gears 401 are connected by a planetary carrier 404; a first circular hole for the second shaft 302 to pass through is opened on the planetary carrier 404, and a second circular hole for the second shaft 302 to pass through is opened on the sun gear 403; the sun gear 403 and the worm gear shaft 201 are detachably connected by a first connecting mechanism; the planetary carrier 404 and the shaft 1 301 are detachably connected by a second connecting mechanism.

[0033] In this embodiment, the traditional planetary gear reduction mechanism is optimized, and the integrated reducer of the planetary gear reduction mechanism is installed. Figure 5 As shown, from Figure 5 As can be seen, the right end of shaft 1 (301) of output shaft 3 is connected to planet carrier 404 via a second connecting mechanism, while sun gear 403 is connected to worm gear shaft 201 via a first connecting mechanism. Furthermore, the first connecting mechanism allows sun gear 403 to be detachably connected to worm gear shaft 201, while the second connecting mechanism allows planet carrier 404 to be detachably connected to shaft 1 (301). This allows for quick and easy removal of sun gear 403 and worm gear shaft 201 when worm gear 2 is severely worn, or when sun gear 403 in planetary gear reduction mechanism 4 is severely worn and needs to be replaced, facilitating subsequent repair and replacement. The second connecting mechanism allows for detachable connection of planet carrier 404 and shaft 1 (301), making output shaft 3 and planetary gear reduction mechanism 4 independent of each other. This facilitates easy installation and removal between the output shaft 3 and planetary gear reduction mechanism 4, facilitating subsequent repair and replacement.

[0034] As a specific example, Figure 3 and Figure 4 As shown, the sun gear 403 includes an integrally formed sun gear cylinder 406 and sun gear meshing teeth 407. The sun gear meshing teeth 407 are evenly arranged on the outer circumference of the sun gear cylinder 406 around the axis of the sun gear cylinder 406. A sun gear cylinder cavity 409 is formed inside the sun gear cylinder 406, and the sun gear cylinder cavity 409 forms the above-mentioned second circular hole.

[0035] As a preferred embodiment, the first connecting mechanism includes a flange connecting ring coaxially arranged on the worm gear shaft 201 and a sun gear fixing flange 408 arranged on the sun gear 403. The sun gear fixing flange 408 is arranged at the end of the sun gear cylinder 406 close to the worm gear shaft 201, and the sun gear fixing flange 408 and the sun gear cylinder 406 are integrally formed. The sun gear fixing flange 408 and the flange connecting ring on the worm gear shaft 201 are connected by bolts. In this way, when connecting the worm gear shaft 201 and the sun gear 403, it is only necessary to fit the flange connecting ring on the worm gear shaft 201 and the sun gear fixing flange 408 on the sun gear 403 together and then secure them with bolts. This facilitates the subsequent installation and disassembly of the worm gear shaft 201 and the sun gear 403. When the worm gear 2 is severely worn or the sun gear 403 in the planetary gear reduction mechanism 4 is severely worn and needs to be replaced, the sun gear 403 and the worm gear shaft 201 can be disassembled quickly and conveniently, which is convenient for subsequent maintenance and replacement. There is no need to replace the entire worm gear 2, worm gear shaft 201 and sun gear 403.

[0036] As a preferred embodiment, the second connecting mechanism includes a connector 410 mounted on the end surface of the planet carrier 404 and a fixed flange ring mounted on the first shaft 301. The second connecting mechanism includes a first flange 412, a tubular body 411, and a second flange 413, which are sequentially connected. The first flange 412, tubular body 411, and second flange 413 are integrally formed. The first flange 412 is bolted to the end surface of the planet carrier 404, and the second flange 413 is bolted to the fixed flange ring. This facilitates subsequent installation and removal between the first shaft 301 and the planet carrier 404, making the output shaft 3 and the planetary gear reduction mechanism 4 independent of each other. If a problem occurs with one of them, the entire mechanism does not need to be disassembled, saving repair costs.

[0037] like Figure 1 As shown, three planetary gears 401 are provided, and a fixed rotating shaft 414 is installed on the end surface of the three planetary gears 401 facing the planetary carrier 404. The fixed rotating shaft 414 and the planetary gear 401 are coaxially arranged. The planetary carrier 404 is in the shape of a triangular plate. The triangular part of the planetary carrier 404 is provided with mounting holes corresponding to the planetary gears 401 one by one. A bearing is provided on the inner wall of each mounting hole. The outer ring of the bearing is fixed on the inner wall of the mounting hole, and the inner ring of the bearing and the corresponding fixed rotating shaft 414 are interference fit.

[0038] Example 2:

[0039] like Figure 4-Figure 7As shown, embodiment 2 of the present invention provides an integrated reducer, including a worm wheel 2, a worm 15, an output shaft 3, a worm wheel shaft 201 and the planetary gear reduction mechanism 4 in the above-mentioned embodiment 1, the worm wheel 2 is coaxially arranged on the worm wheel shaft 201, the worm wheel 2 includes a plurality of cylindrical rollers, and the plurality of rollers are evenly arranged around the axis of the worm wheel 2, and the tooth surface of the worm 15 is engaged with the rollers; the planetary gear reduction mechanism 4 includes a sun gear 403, the sun gear 403 is connected to one end of the worm wheel shaft 201, and the output end of the planetary gear reduction mechanism 4 is connected to the output shaft 3 for driving the output shaft 3 to rotate.

[0040] The input end of the new integrated reducer in this embodiment drives the worm 15 to rotate, and the tooth surface on the worm 15 and the roller on the worm wheel 2 cooperate to drive the worm wheel 2 to rotate, and the worm wheel 2 and the worm wheel shaft 201 rotate, and the worm wheel shaft 201 drives the sun gear 403 to rotate, and the sun gear 403 rotates to drive multiple planetary gears 401 to rotate. The multiple planetary gears 401 are connected to the planet carrier 404 on the planetary gear reduction mechanism 4. Since the output shaft 3 of the reducer is connected to the output end of the planetary gear reduction mechanism 4, it can drive the output shaft 3 to rotate accordingly.

[0041] Unlike traditional worm gears, the worm wheel 2 in this embodiment is equipped with multiple cylindrical rollers, and the worm 15 has tooth surfaces that match the rollers. The cylindrical rollers on the worm wheel 2 and the tooth surfaces on the worm 15 work together to form a primary reduction gear. Compared with traditional worm gears, this embodiment offers the following advantages: First, the cylindrical roller worm gear has high transmission efficiency, generally exceeding 90%, and low energy loss. Second, it has a high load-bearing capacity, capable of withstanding large forces and torques, making it suitable for applications requiring high-intensity transmission.

[0042] Therefore, using a cylindrical roller worm gear to replace the traditional worm gear can improve the transmission efficiency and load-bearing capacity of the reducer and can be applied to various heavy-load working conditions.

[0043] Secondly, in this embodiment, the planetary gear reduction mechanism is used as the secondary reduction mechanism, which can further reduce the rotation speed of the reducer output shaft 3 and increase the speed ratio and torque of the reducer.

[0044] Therefore, compared with the traditional worm gear reducer, the integrated reducer in this embodiment adopts a two-stage reduction method, which effectively improves its load-bearing capacity, allowing it to easily start large-load equipment and achieve the purpose of high torque and high speed ratio output.

[0045] As a preferred embodiment, Figure 4 As shown, the new integrated reducer includes a housing 1 and a lower housing 14. The housing 1 is in the shape of a cylinder, and the lower housing 14 is in the shape of a circular tube. The lower housing 14 is connected to the side wall of the housing 1. Figure 5 As shown, the housing 1 has an interior mounting cavity. A second opening and a first opening are respectively provided on the left and right sides of the housing 1. Both the first and second openings communicate with the mounting cavity. The planetary gear reduction mechanism 4 and the worm gear shaft 201 are sequentially disposed within the mounting cavity, and the planetary gear reduction mechanism 4 and the worm gear shaft 201 are coaxially arranged. The outer ring housing 405 of the planetary gear reduction mechanism 4 is coaxially fixed within the mounting cavity. The sun gear 403 of the planetary gear reduction mechanism 4 faces the worm gear shaft 201, and the planet carrier 404 faces the second opening.

[0046] Furthermore, the output shaft 3 includes a connected shaft 1 301 and a shaft 2 302 , a through hole for the shaft 2 302 to pass through is coaxially opened on the worm shaft 201 , and a circular hole for the shaft 2 302 to pass through is coaxially opened on the sun gear 403 , and the through hole and the circular hole are coaxially arranged.

[0047] Furthermore, a flange connection ring is coaxially provided on the left end of the worm gear shaft 201. A sun gear fixing flange 408 on the sun gear 403 in the planetary gear reduction mechanism 4 is secured to the flange connection ring on the left end of the worm gear shaft 201 via bolts. This allows for connection between the worm gear shaft 201 and the sun gear 403 by simply aligning the flange connection ring on the worm gear shaft 201 with the sun gear fixing flange 408 on the sun gear 403 and then securing them with bolts. This facilitates subsequent installation and removal of the worm gear shaft 201 and the sun gear 403.

[0048] Further, such as Figure 5 The right end face of shaft 1 301 is provided with a fixed flange ring, which is bolted to a connector 410 on the left end face of planet carrier 404. This facilitates subsequent installation and removal of shaft 1 301 and planet carrier 404, making output shaft 3 and planet carrier 404 of planetary gear reduction mechanism 4 independent of each other. If a problem occurs with either, the entire assembly does not need to be removed, saving repair costs.

[0049] As a preferred embodiment, Figure 5 As shown, a first bearing seat 10 is installed on the inner wall of the first opening of the housing 1. A first bearing 7 is provided on the inner wall of the first bearing seat 10. The first bearing 7 is connected to the right end of the worm shaft 201. The first bearing 7 supports the worm shaft 201.

[0050] Furthermore, a first oil seal 9 is sleeved on the right end of the second shaft 302 , and a first oil seal end cover 8 is installed between the inner wall of the first bearing seat 10 and the first oil seal 9 .

[0051] Further, such as Figure 5As shown, an outer bearing 5 is coaxially provided on the inner wall of the mounting cavity, and a pipe fitting is provided on the right side of the main frame of the planetary gear reduction mechanism 4. The pipe fitting is connected with the inner ring of the outer bearing 5, and an inner bearing 6 is provided on the inner wall of the pipe fitting. The outer ring of the inner bearing 6 is connected to the inner wall of the pipe fitting, and the left end of the worm shaft 201 is connected with the inner bearing 6. The inner bearing 6 supports the left end of the worm shaft 201.

[0052] As a preferred embodiment, a second bearing seat 11 is mounted on the inner wall of the second opening on the left side of the housing 1. A second bearing 12 is mounted on the inner wall of the second bearing seat 11. The second bearing 12 is matingly connected to the first shaft 301. Furthermore, a second oil seal 13 is sleeved on the first shaft 301, and a second oil seal end cap 21 is provided between the inner wall of the second bearing seat 11 and the second oil seal 13.

[0053] Preferably, Figure 6 and Figure 7 As shown, the lower shell 14 has a cavity, and the worm 15 is arranged in the cavity. The right side and the left side of the lower shell 14 are respectively provided with a first port and a second port, and the input end of the worm 15 passes through the first port; a third bearing seat 16 is provided on the inner wall of the first port, and a third bearing 17 is installed on the inner wall of the third bearing seat 16. Furthermore, a fourth bearing 20 is installed on the inner wall of the second port of the lower shell 14. The third bearing 17 and the fourth bearing 20 are both connected with the worm 15 to support the worm 15.

[0054] As a preferred embodiment, a third oil seal 18 is provided on the input end of the worm 15, and the third oil seal 18 contacts the inner wall of the third bearing seat 16. A third oil seal end cover is installed on the first opening of the lower shell 14, and a sealing end cover 19 is provided on the inner wall of the second port.

[0055] In the description of this utility model, it should be noted that the terms "upper" and "lower" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A planetary reduction mechanism for a reducer, installed in an integrated reducer, wherein the integrated reducer comprises a worm gear shaft and an output shaft, wherein the output shaft comprises a first shaft and a second shaft connected to each other, and a hole is provided on the worm gear shaft along its axis for the second shaft to pass through, wherein: It includes an outer ring shell (405), a ring gear (402), a sun gear (403), a plurality of planetary gears (401), a planetary carrier (404), a first connecting mechanism and a second connecting mechanism; The ring gear (402) is coaxially arranged on the inner wall of the outer ring housing (405), the sun gear (403) is centrally arranged at the center of the ring gear (402), the plurality of planetary gears (401) are respectively engaged with the ring gear (402) and the sun gear (403), and the plurality of planetary gears (401) are connected to each other via the planet carrier (404); The planet carrier (404) is provided with a first circular hole for the second shaft to pass through, and the sun gear (403) is provided with a second circular hole for the second shaft to pass through; The sun gear (403) is detachably connected to the worm gear shaft via the first connection mechanism; and the planet carrier (404) is detachably connected to the first shaft via the second connection mechanism.

2. A planetary reduction mechanism for a reducer according to claim 1, characterized in that: The sun gear (403) comprises an integrally formed sun gear cylinder (406) and sun gear meshing teeth (407), wherein the sun gear meshing teeth (407) are evenly arranged on the outer peripheral surface of the sun gear cylinder (406) around the axis of the sun gear cylinder (406), and the cylinder cavity of the sun gear cylinder (406) forms the second circular hole.

3. A planetary reduction mechanism for a reducer according to claim 2, characterized in that: The first connecting mechanism comprises a flange connecting ring coaxially arranged on the worm gear shaft and a sun gear fixing flange (408) arranged on the sun gear (403); the sun gear fixing flange (408) is arranged at one end of the sun gear cylinder (406) close to the worm gear shaft; the sun gear fixing flange (408) and the flange connecting ring are connected by bolts.

4. A planetary reduction mechanism for a reducer according to claim 3, characterized in that: The sun gear fixing flange (408) and the sun gear cylinder (406) are integrally formed.

5. The planetary reduction mechanism of a reducer according to claim 3, characterized in that: The sun gear fixing flange (408) extends from the outer ring shell (405).

6. The planetary reduction mechanism of a reducer according to claim 1, characterized in that: The second connecting mechanism includes a connecting piece (410) installed on the end surface of the planetary carrier (404) and a fixed flange ring installed on the shaft one, and the second connecting mechanism includes a first flange (412), a tube body (411) and a second flange (413) connected in sequence, the first flange (412) and the end surface of the planetary carrier (404) are connected by bolts, and the second flange (413) and the fixed flange ring are connected by bolts.

7. A planetary reduction mechanism for a reducer according to claim 6, characterized in that: The first flange (412), the tube body (411) and the second flange (413) are integrally formed.

8. The planetary reduction mechanism of a reducer according to claim 1, characterized in that: A fixed rotating shaft (414) is mounted on the same end face of each of the planetary wheels (401), and mounting holes corresponding to the planetary wheels (401) are provided on the planetary carrier (404). A bearing is provided on the inner wall of each mounting hole, and the inner ring of the bearing is interference-fitted with the corresponding fixed rotating shaft (414).

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