Planetary reducer

Abstract

The utility model provides a planetary reducer and belongs to the technical field of reducers. The technical problem that an existing planetary reducer is low in efficiency is solved. The planetary reducer comprises a shell, a first-stage planetary mechanism, a second-stage planetary mechanism and a third-stage planetary mechanism are sequentially and fixedly installed in the shell, a first-stage planetary carrier comprises a first-stage upper circular plate and a first-stage lower circular plate, and a first-stage connecting plate is fixedly connected between the first-stage upper circular plate and the first-stage lower circular plate; a first-stage through hole is formed in the middle of the first-stage upper circular plate, a first-stage spline hole opposite to the first-stage through hole is formed in the middle of the first-stage lower circular plate, and the second-stage sun gear is in spline fit with the first-stage spline hole; the second-stage planet carrier comprises a second-stage upper circular plate and a second-stage lower circular plate, a second-stage connecting plate is fixedly connected between the second-stage upper circular plate and the second-stage lower circular plate, a second-stage through hole is formed in the middle of the second-stage upper circular plate, a second-stage spline hole opposite to the second-stage through hole is formed in the middle of the second-stage lower circular plate, and the third-stage sun gear is in spline fit with the second-stage spline hole; the third-stage planet carrier comprises a third-stage upper circular plate and a third-stage lower circular plate, a third-stage connecting plate is fixedly connected between the third-stage upper circular plate and the third-stage lower circular plate, a third-stage through hole is formed in the middle of the third-stage upper circular plate, a third-stage spline hole opposite to the third-stage through hole is formed in the middle of the third-stage lower circular plate, and the third-stage spline hole is connected with an output shaft through a spline in a matched mode. According to the utility model, the efficiency can be better improved under the multi-stage speed reduction combination.

Description

Technical Field

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

[0002] A planetary reducer is a reducer with three planetary gears rotating around a sun gear. The planetary reducer achieves the purpose of speed reduction by meshing a large gear with a large number of teeth with a gear with a small number of teeth. Since one set of planetary gears cannot meet a larger transmission ratio, sometimes two or three sets are needed to meet the user's requirements for a larger transmission ratio. Due to the increase in the number of planetary gears, the length of the two-stage or three-stage reduction stage will increase and the efficiency will decrease. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a planetary reducer that can better stabilize operation and improve efficiency.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a planetary reducer, including a shell, in which a primary planetary mechanism, a secondary planetary mechanism and a tertiary planetary mechanism are fixedly installed in sequence, the primary planetary mechanism includes a primary sun gear, a primary planetary gear, a primary internal gear ring and a primary planetary carrier, the secondary planetary mechanism includes a secondary sun gear, a secondary planetary gear, a secondary internal gear ring and a secondary planetary carrier, the tertiary planetary mechanism includes a tertiary sun gear, a tertiary planetary gear, a tertiary internal gear ring and a tertiary planetary carrier, the primary planetary carrier includes a primary upper circular plate and a primary lower circular plate, a primary connecting plate is fixedly connected between the primary upper circular plate and the primary lower circular plate, the primary upper circular plate has a primary through hole in the middle, and the primary lower circular plate has a primary through hole in the middle. It has a primary spline hole opposite to the primary through hole, and the secondary sun gear is spline-matched with the primary spline hole; the secondary planetary frame includes a secondary upper circular plate and a secondary lower circular plate, a secondary connecting plate is fixedly connected between the secondary upper circular plate and the secondary lower circular plate, a secondary through hole is provided in the middle of the secondary upper circular plate, a secondary spline hole opposite to the secondary through hole is provided in the middle of the secondary lower circular plate, and the tertiary sun gear is spline-matched with the secondary spline hole; the tertiary planetary frame includes a tertiary upper circular plate and a tertiary lower circular plate, a tertiary connecting plate is fixedly connected between the tertiary upper circular plate, a tertiary through hole is provided in the middle of the tertiary lower circular plate, a tertiary spline hole opposite to the tertiary through hole is provided in the middle of the tertiary lower circular plate, and the tertiary spline hole is connected to the output shaft through spline matching.

[0005] Furthermore, the first-stage planetary gear is rotatably fixed between the first-stage upper circular plate and the first-stage lower circular plate through a first-stage pin shaft, and the first-stage sun gear includes a first-stage spline portion and a first-stage gear portion, the first-stage spline portion extends out of the first-stage through hole and is connected to the input shaft, the first-stage gear portion is meshed with the first-stage planetary gear for transmission, and the first-stage planetary gear is meshed with the first-stage internal gear ring for transmission and drives the first-stage planetary carrier to rotate around the first-stage sun gear.

[0006] Furthermore, the secondary planetary gear is rotatably fixed between the secondary upper circular plate and the secondary lower circular plate by a secondary pin shaft, and the secondary sun gear includes a secondary spline portion and a secondary gear portion. The secondary spline portion extends out of the secondary through hole and cooperates with the spline of the primary spline hole for transmission, the secondary gear portion meshes with the secondary planetary gear for transmission, and the secondary planetary gear meshes with the secondary internal gear ring for transmission and drives the secondary planetary carrier to rotate around the secondary sun gear.

[0007] Furthermore, the three-stage planetary gear is rotatably fixed between the three-stage upper circular plate and the three-stage lower circular plate through the three-stage pin shaft, and the three-stage sun gear includes a three-stage spline portion and a three-stage gear portion. The three-stage spline portion extends out of the three-stage through hole and cooperates with the spline of the two-stage spline hole for transmission. The three-stage gear portion is meshed with the three-stage planetary gear for transmission, and the three-stage planetary gear is meshed with the three-stage inner gear ring for transmission and drives the three-stage planetary carrier to rotate around the three-stage sun gear.

[0008] Furthermore, a first-level mounting groove recessed outward is provided at the end of the first-level spline hole near the first-level through hole, a first-level isolation gasket is provided in the first-level mounting groove, a first-level cylindrical portion protrudes from the lower end face of the first-level gear portion away from the first-level spline portion, a height of the first-level cylindrical portion is greater than the distance between the upper end face of the first-level isolation gasket and the lower end face of the first-level gear portion, and a certain gap is present between the upper end face of the second-level spline portion and the lower end face of the first-level isolation gasket.

[0009] Furthermore, a secondary mounting groove recessed outward is provided at the end of the secondary spline hole near the secondary through hole, a secondary isolation gasket is provided in the secondary mounting groove, a secondary cylindrical portion protrudes from the lower end face of the secondary gear portion away from the secondary spline portion, a height of the secondary cylindrical portion is greater than the distance between the upper end face of the secondary isolation gasket and the lower end face of the secondary gear portion, and a certain gap is present between the upper end face of the tertiary spline portion and the lower end face of the secondary isolation gasket.

[0010] Furthermore, a third-level mounting groove recessed outward is provided at the end of the third-level spline hole near the third-level through hole, a third-level isolation gasket is provided in the third-level mounting groove, and a third-level cylindrical portion protrudes from the lower end face of the third-level gear portion away from the third-level spline portion, and the height of the third-level cylindrical portion is greater than the distance between the upper end face of the third-level isolation gasket and the lower end face of the second-level gear portion.

[0011] Furthermore, a first-level lower circular plate extends toward the direction of the second-level sun gear with a first-level flange, a first-level spline hole extends in the first-level flange, a second-level lower circular plate extends toward the direction of the third-level sun gear with a second-level spline hole extends in the second-level flange, and a third-level lower circular plate extends toward the direction of the output shaft with a third-level spline hole extends in the third-level flange.

[0012] Furthermore, the outer shell includes an input end cover, a first-stage connecting sleeve, a second-stage connecting sleeve, a third-stage connecting sleeve and an output end cover. The input end cover and the first-stage connecting sleeve are sealed and fixed. A first-stage internal gear ring is sealed and fixed between the first-stage connecting sleeve and the second-stage connecting sleeve. A second-stage internal gear ring is sealed and fixed between the second-stage connecting sleeve and the third-stage connecting sleeve. A third-stage internal gear ring is sealed and fixed between the third-stage connecting sleeve and the output end cover.

[0013] Compared with the prior art, the technical effects of the utility model are as follows: 1. The first-stage planetary frame, the second-stage planetary frame and the third-stage planetary frame are all fixedly connected by the upper and lower circular plates, which reduces the weight to a certain extent, thereby reducing the energy loss during the rotation process; the upper and lower circular plates are fixedly connected by the connecting plates, and have sufficient space and strength to support the rotation of the planetary gears at all levels, making the transmission of the whole machine more stable;

[0014] Second, the primary spline hole, the secondary spline hole and the tertiary spline hole penetrate the primary lower circular plate, the secondary lower circular plate and the tertiary lower circular plate respectively, which reduces the weight of each level of the planetary carrier, and the primary flange, the secondary flange and the tertiary flange protruding from the lower end surfaces of the primary lower circular plate, the secondary lower circular plate and the tertiary lower circular plate respectively can increase the spline matching length with the primary output shaft of the secondary sun gear and the tertiary sun gear without increasing the overall axial size, thereby increasing the transmission force and making the transmission of the whole machine more stable.

[0015] 3. The primary spline hole, secondary spline hole and tertiary spline hole respectively penetrate the primary planet carrier, the secondary planet carrier and the tertiary planet carrier to reduce the weight of each level of the planet carrier. In addition, isolation gaskets of various levels are arranged on the upper ends of the spline holes of various levels to enable each level of the planetary mechanism to have better meshing transmission and better rotation transmission with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the utility model.

[0017] Figure 2 It is a half-section stereoscopic diagram of the first-stage planetary mechanism of the utility model.

[0018] Figure 3 It is a half-section stereoscopic diagram of the two-stage planetary mechanism of the utility model.

[0019] Figure 4 It is a half-section stereoscopic diagram of a three-stage planetary mechanism of the utility model.

[0020] Figure number marking: 1, first-stage planetary mechanism; 101, first-stage sun gear; 1011, first-stage spline portion; 1012, first-stage gear portion; 1013, first-stage cylindrical portion; 102, first-stage planetary gear; 103, first-stage internal gear ring; 104, first-stage planet carrier; 1041, first-stage upper circular plate; 1042, first-stage lower circular plate; 1043, first-stage connecting plate; 1044, first-stage through hole; 1045, first-stage spline hole; 1046, Primary mounting groove; 1047, primary flange; 105, primary pin; 2, secondary planetary mechanism; 201, secondary sun gear; 2011, secondary spline portion; 2012, secondary gear portion; 2013, secondary cylindrical portion; 202, secondary planetary gear; 203, secondary internal gear ring; 204, secondary planet carrier; 2041, secondary upper circular plate; 2042, secondary lower circular plate; 2043, secondary connecting plate; 2044, secondary 2045, secondary spline hole; 2046, secondary mounting groove; 2047, secondary flange; 205, secondary pin shaft; 3, primary planetary mechanism; 301, third-stage sun gear; 3011, third-stage spline part; 3012, third-stage gear part; 3013, third-stage cylindrical part; 302, third-stage planetary gear; 303, third-stage inner gear ring; 304, third-stage planetary carrier; 3041, third-stage upper circular plate; 3042, third-stage lower Round plate; 3043, three-level connecting plate; 3044, three-level through hole; 3045, three-level spline hole; 3046, three-level mounting groove; 3047, three-level flange; 305, three-level pin shaft; 4, output shaft; 5, input shaft; 6, first-level isolation gasket; 7, second-level isolation gasket; 8, third-level isolation gasket; 9, input end cover; 10, first-level connecting sleeve; 11, second-level connecting sleeve; 12, third-level connecting sleeve; 13, output end cover. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] It should be noted that the descriptions of the present invention regarding directions such as "up", "down", "left", "right", "top" and "bottom" are all defined based on the relationships between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] according to Figures 1 to 4As shown: A planetary reducer includes a housing, in which a primary planetary mechanism 31, a secondary planetary mechanism 2 and a tertiary planetary mechanism are fixedly installed in sequence. The primary planetary mechanism 31 includes a primary sun gear 101, a primary planetary gear 102, a primary internal gear ring 103 and a primary planet carrier 104. The secondary planetary mechanism 2 includes a secondary sun gear 201, a secondary planetary gear 202, a secondary internal gear ring 203 and a secondary planet carrier 204. The tertiary planetary mechanism includes a tertiary sun gear 301, a tertiary planetary gear 302, a tertiary internal gear ring 303 and a tertiary planet carrier 304. The housing includes an input end cover 9, a primary connecting sleeve 10, a secondary connecting sleeve 11, a tertiary connecting sleeve 12 and an output end cover 13. The input end cover 9 and the first-stage connecting sleeve 10 are sealed and fixed, a first-stage internal gear ring 103 is sealed and fixed between the first-stage connecting sleeve 10 and the second-stage connecting sleeve 11, a second-stage internal gear ring 203 is sealed and fixed between the second-stage connecting sleeve 11 and the third-stage connecting sleeve 12, and a third-stage internal gear ring 303 is sealed and fixed between the third-stage connecting sleeve 12 and the output end cover 13.

[0024] The first-stage planetary carrier 104 includes a first-stage upper circular plate 1041 and a first-stage lower circular plate 1042, a first-stage connecting plate 1043 is fixedly connected between the first-stage upper circular plate 1041 and the first-stage lower circular plate 1042, a first-stage through hole 1044 is provided in the middle of the first-stage upper circular plate 1041, a first-stage spline hole 1045 is provided in the middle of the first-stage lower circular plate 1042 and is opposite to the first-stage through hole 1044, and the second-stage sun gear 201 is spline-matched with the first-stage spline hole 1045. The first-stage planetary gear 102 is rotatably fixed between the first-stage upper circular plate 1041 and the first-stage lower circular plate 1042 through the first-stage pin shaft 105. The first-stage sun gear 101 includes a first-stage spline portion 1011 and a first-stage gear portion 1012. The first-stage spline portion 1011 extends out of the first-stage through hole 1044 and is connected to the input shaft 5. The first-stage gear portion 1012 is meshed with the first-stage planetary gear 102 for transmission, and the first-stage planetary gear 102 is meshed with the first-stage inner gear ring 103 for transmission and drives the first-stage planet carrier 104 to rotate around the first-stage sun gear 101.

[0025] The secondary planetary carrier 204 includes a secondary upper circular plate 2041 and a secondary lower circular plate 2042, a secondary connecting plate 2043 is fixedly connected between the secondary upper circular plate 2041 and the secondary lower circular plate 2042, a secondary through hole 2044 is provided in the middle of the secondary upper circular plate 2041, a secondary spline hole 2045 is provided in the middle of the secondary lower circular plate 2042 and is opposite to the secondary through hole 2044, and the tertiary sun gear 301 is spline-matched with the secondary spline hole 2045. The secondary planetary gear 202 is rotatably fixed between the secondary upper circular plate 2041 and the secondary lower circular plate 2042 through the secondary pin shaft 205. The secondary sun gear 201 includes a secondary spline portion 2011 and a secondary gear portion 2012. The secondary spline portion 2011 extends out of the secondary through hole 2044 and is spline-matched with the primary spline hole 1045 for transmission. The secondary gear portion 2012 is meshed with the secondary planetary gear 202 for transmission, and the secondary planetary gear 202 is meshed with the secondary inner gear ring 203 for transmission and drives the secondary planet carrier 204 to rotate around the secondary sun gear 201.

[0026] The three-stage planetary carrier 304 includes a three-stage upper circular plate 3041 and a three-stage lower circular plate 3042, a three-stage connecting plate 3043 is fixedly connected between the three-stage upper circular plate 3041 and the three-stage lower circular plate 3042, a three-stage through hole 3044 is provided in the middle of the three-stage upper circular plate 3041, a three-stage spline hole 3045 opposite to the three-stage through hole 3044 is provided in the middle of the three-stage lower circular plate 3042, and the three-stage spline hole 3045 is connected to the output shaft 4 through spline matching. The third-stage planetary gear 302 is rotatably fixed between the third-stage upper circular plate 3041 and the third-stage lower circular plate 3042 through the third-stage pin shaft 305. The third-stage sun gear 301 includes a third-stage spline portion 3011 and a third-stage gear portion 3012. The third-stage spline portion 3011 extends out of the third-stage through hole 3044 and is spline-matched with the second-stage spline hole 2045 for transmission. The third-stage gear portion 3012 is meshed with the third-stage planetary gear 302 for transmission, and the third-stage planetary gear 302 is meshed with the third-stage inner gear ring 303 for transmission and drives the third-stage planetary carrier 304 to rotate around the third-stage sun gear 301.

[0027] The first-stage planet carrier 104, the second-stage planet carrier 204 and the third-stage planet carrier 304 are all fixedly connected by upper and lower circular plates, which reduces the weight to a certain extent and reduces the energy loss during the rotation. The upper and lower circular plates are fixedly connected by connecting plates, which have sufficient space and strength to support the rotation of the planetary gears at all levels, making the transmission of the whole machine more stable.

[0028] Furthermore, a first-level mounting groove 1046 recessed outward is provided at the end of the first-level spline hole 1045 near the first-level through hole 1044, a first-level isolation gasket 6 is provided in the first-level mounting groove 1046, a first-level cylindrical portion 1013 protrudes from the lower end surface of the first-level gear portion 1012 away from the first-level spline portion 1011, a height of the first-level cylindrical portion 1013 is greater than the distance between the upper end surface of the first-level isolation gasket 6 and the lower end surface of the first-level gear portion 1012, and a certain gap is present between the upper end surface of the second-level spline portion 2011 and the lower end surface of the first-level isolation gasket 6. A secondary mounting groove 2046 recessed outward is provided at the end of the secondary spline hole 2045 near the secondary through hole 2044, a secondary isolation gasket 7 is provided in the secondary mounting groove 2046, a secondary cylindrical portion 2013 protrudes from the lower end surface of the secondary gear portion 2012 away from the secondary spline portion 2011, a height of the secondary cylindrical portion 2013 is greater than the distance between the upper end surface of the secondary isolation gasket 7 and the lower end surface of the secondary gear portion 2012, and a certain gap is present between the upper end surface of the tertiary spline portion 3011 and the lower end surface of the secondary isolation gasket 7. The end of the tertiary spline hole 3045 near the tertiary through hole 3044 is provided with a tertiary mounting groove 3046 which is recessed outwards, and a tertiary isolation gasket 8 is provided in the tertiary mounting groove 3046. The tertiary gear portion 3012 has a tertiary cylindrical portion 3013 protruding from the lower end face away from the tertiary spline portion 3011, and the height of the tertiary cylindrical portion 3013 is greater than the distance between the upper end face of the tertiary isolation gasket 8 and the lower end face of the secondary gear portion 2012. The primary spline hole 1045, the secondary spline hole 2045 and the tertiary spline hole 3045 penetrate the primary lower circular plate 1042, the secondary lower circular plate 2042 and the tertiary lower circular plate 3042 respectively, which reduces the weight of the planetary carriers at each stage, and the primary flange 1047, the secondary flange 2047 and the tertiary flange protruding from the lower end surfaces of the primary lower circular plate 1042, the secondary lower circular plate 2042 and the tertiary lower circular plate 3042 respectively can increase the spline matching length with the primary output shaft 4 of the secondary sun gear 201 and the tertiary sun gear 301 without increasing the overall axial size, thereby increasing the transmission force and making the transmission of the whole machine more stable.

[0029] The first-stage lower circular plate 1042 has a first-stage flange 1047 extending toward the direction of the second-stage sun gear 201, and a first-stage spline hole 1045 extending inside the first-stage flange 1047; the second-stage lower circular plate 2042 has a second-stage flange 2047 extending toward the direction of the third-stage sun gear 301, and a second-stage spline hole 2045 extending inside the second-stage flange 2047; the third-stage lower circular plate 3042 has a third-stage flange 3047 extending toward the direction of the output shaft 4, and a third-stage spline hole 3045 extending inside the third-stage flange 3047.

[0030] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A planetary reducer, comprising a housing, wherein a primary planetary mechanism (1), a secondary planetary mechanism (2) and a tertiary planetary mechanism (3) are fixedly mounted in sequence in the housing, wherein the primary planetary mechanism (1) comprises a primary sun gear (101), a primary planetary gear (102), a primary internal gear ring (103) and a primary planet carrier (104), the secondary planetary mechanism (2) comprises a secondary sun gear (201), a secondary planetary gear (202), a secondary internal gear ring (203) and a secondary planet carrier (204), and the tertiary planetary mechanism (3) comprises a tertiary sun gear (301), a tertiary planetary gear (302), a tertiary internal gear ring (303) and a tertiary planet carrier (304), characterized in that: The first-stage planet carrier (104) comprises a first-stage upper circular plate (1041) and a first-stage lower circular plate (1042), a first-stage connecting plate (1043) is fixedly connected between the first-stage upper circular plate (1041) and the first-stage lower circular plate (1042), a first-stage through hole (1044) is provided in the middle of the first-stage upper circular plate (1041), a first-stage spline hole (1045) opposite to the first-stage through hole (1044) is provided in the middle of the first-stage lower circular plate (1042), and a second-stage sun gear (201) is spline-matched with the first-stage spline hole (1045); the second-stage planet carrier (204) comprises a second-stage upper circular plate (2041) and a second-stage lower circular plate (2042), a second-stage connecting plate (2043) is fixedly connected between the second-stage upper circular plate (2041) and the second-stage lower circular plate (2042), and the second-stage upper circular plate (2041) and the second-stage lower circular plate (2042) are spline-matched. 41) has a secondary through hole (2044) in the middle, the secondary lower circular plate (2042) has a secondary spline hole (2045) in the middle opposite to the secondary through hole (2044), and the tertiary sun gear (301) is spline-matched with the secondary spline hole (2045); the tertiary planetary carrier (304) comprises a tertiary upper circular plate (3041) and a tertiary lower circular plate (3042), a tertiary connecting plate (3043) is fixedly connected between the tertiary upper circular plate (3041) and the tertiary lower circular plate (3042), the tertiary upper circular plate (3041) has a tertiary through hole (3044) in the middle, the tertiary lower circular plate (3042) has a tertiary spline hole (3045) in the middle opposite to the tertiary through hole (3044), and the tertiary spline hole (3045) is spline-matched with the output shaft (4).

2. A planetary reducer according to claim 1, characterized in that: The primary planetary gear (102) is rotatably fixed between the primary upper circular plate (1041) and the primary lower circular plate (1042) via a primary pin shaft (105); the primary sun gear (101) comprises a primary spline portion (1011) and a primary gear portion (1012); the primary spline portion (1011) extends out of a primary through hole (1044) and is connected to an input shaft (5); the primary gear portion (1012) is meshed with the primary planetary gear (102) for transmission; the primary planetary gear (102) is meshed with the primary inner gear ring (103) for transmission and drives the primary planet carrier (104) to rotate around the primary sun gear (101).

3. A planetary reducer according to claim 2, characterized in that: The secondary planetary gear (202) is rotatably fixed between the secondary upper circular plate (2041) and the secondary lower circular plate (2042) via the secondary pin shaft (205); the secondary sun gear (201) comprises a secondary spline portion (2011) and a secondary gear portion (2012); the secondary spline portion (2011) extends out of the secondary through hole (2044) and is spline-matched with the primary spline hole (1045) for transmission; the secondary gear portion (2012) is meshed with the secondary planetary gear (202) for transmission; the secondary planetary gear (202) is meshed with the secondary inner gear ring (203) for transmission and drives the secondary planet carrier (204) to rotate around the secondary sun gear (201).

4. A planetary reducer according to claim 3, characterized in that: The third-stage planetary gear (302) is rotatably fixed between the third-stage upper circular plate (3041) and the third-stage lower circular plate (3042) via a third-stage pin shaft (305); the third-stage sun gear (301) comprises a third-stage spline portion (3011) and a third-stage gear portion (3012); the third-stage spline portion (3011) extends out of the third-stage through hole (3044) and is spline-matched with the second-stage spline hole (2045) for transmission; the third-stage gear portion (3012) is meshed with the third-stage planetary gear (302) for transmission; the third-stage planetary gear (302) is meshed with the third-stage inner gear ring (303) for transmission and drives the third-stage planet carrier (304) to rotate around the third-stage sun gear (301).

5. A planetary reducer according to any one of claims 1 to 4, characterized in that: An outwardly recessed first installation groove (1046) is provided at the end of the first spline hole (1045) close to the first through hole (1044), a first isolation gasket (6) is provided in the first installation groove (1046), a first cylindrical portion (1013) protrudes from the lower end surface of the first gear portion (1012) away from the first spline portion (1011), the height of the first cylindrical portion (1013) is greater than the distance between the upper end surface of the first isolation gasket (6) and the lower end surface of the first gear portion (1012), and a certain gap exists between the upper end surface of the second spline portion (2011) and the lower end surface of the first isolation gasket (6).

6. A planetary reducer according to claim 5, characterized in that: A secondary mounting groove (2046) recessed outward is provided at the end of the secondary spline hole (2045) close to the secondary through hole (2044), a secondary isolation gasket (7) is provided in the secondary mounting groove (2046), a secondary cylindrical portion (2013) protrudes from the lower end surface of the secondary gear portion (2012) away from the secondary spline portion (2011), the height of the secondary cylindrical portion (2013) is greater than the distance between the upper end surface of the secondary isolation gasket (7) and the lower end surface of the secondary gear portion (2012), and a certain gap exists between the upper end surface of the tertiary spline portion (3011) and the lower end surface of the secondary isolation gasket (7).

7. A planetary reducer according to claim 6, characterized in that: The end of the tertiary spline hole (3045) close to the tertiary through hole (3044) is provided with a tertiary mounting groove (3046) recessed outward, a tertiary isolation gasket (8) is provided in the tertiary mounting groove (3046), and a tertiary cylindrical portion (3013) protrudes from the lower end surface of the tertiary gear portion (3012) away from the tertiary spline portion (3011), and the height of the tertiary cylindrical portion (3013) is greater than the distance between the upper end surface of the tertiary isolation gasket (8) and the lower end surface of the secondary gear portion (2012).

8. A planetary reducer according to claim 1, characterized in that: The first-stage lower circular plate (1042) has a first-stage flange (1047) extending in the direction of the second-stage sun gear (201), and a first-stage spline hole (1045) extending in the first-stage flange (1047); the second-stage lower circular plate (2042) has a second-stage flange (2047) extending in the direction of the third-stage sun gear (301), and a second-stage spline hole (2045) extending in the second-stage flange (2047); the third-stage lower circular plate (3042) has a third-stage flange (3047) extending in the direction of the output shaft (4), and a third-stage spline hole (3045) extending in the third-stage flange (3047).

9. A planetary reducer according to claim 1, characterized in that: The housing comprises an input end cover (9), a primary connecting sleeve (10), a secondary connecting sleeve (11), a tertiary connecting sleeve (12) and an output end cover (13); the input end cover (9) and the primary connecting sleeve (10) are sealed and fixed; a primary internal gear ring (103) is sealed and fixed between the primary connecting sleeve (10) and the secondary connecting sleeve (11); a secondary internal gear ring (203) is sealed and fixed between the secondary connecting sleeve (11) and the tertiary connecting sleeve (12); and a tertiary internal gear ring (303) is sealed and fixed between the tertiary connecting sleeve (12) and the output end cover (13).

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