Labor-saving planetary gear train

Abstract

A body of the labor-saving planetary gear train comprises a sun gear fixing end cover, a power input sun gear assembly, a dual-power planetary gear carrier assembly, a gear ring assembly, a power output sun gear assembly and a power output sun gear fixing end cover. Power is transmitted to a power input planetary gear on a planetary gear carrier from a power input sun gear, the power input planetary gear transmits the power to the planetary gear carrier, and a power output planetary gear on the planetary gear carrier transmits the power to a power output sun gear; power is input from one sun gear, passes through the planet carrier assembly and is finally output from the other sun gear. Power is input from a large tooth layer of a planetary gear of the planetary gear carrier and output from a power output planetary gear of the planetary gear carrier.

Description

Technical Field

[0001] The invention belongs to the field of planetary gear trains, and specifically relates to a labor-saving planetary gear train in which power is input from a sun gear and then transmitted to another sun gear through a planet carrier. Background Art

[0002] The planetary gear train is an advanced gear transmission mechanism with the advantages of compact structure, small size, small mass, large load-bearing capacity, large power transmission range and transmission range, low operating noise, high efficiency and long life. However, the speed ratio of the existing planetary gear train is inversely proportional to the power ratio, that is, increasing the speed of the power output part can only reduce the power output. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a labor-saving planetary gear system which is highly practical, efficient and environmentally friendly, and in which the power output is greater than the power input when the speed of the power input member is equal to the speed of the power output member.

[0004] The technical solution adopted by the present invention to solve its technical problem is to provide a labor-saving planetary gear train.

[0005] The technical solution of the present invention is: the main body includes, the main body includes, the sun gear fixed end cover, the power input sun gear assembly, the double power planetary gear carrier assembly, the middle sun out assembly, the ring gear assembly, the power output sun gear assembly, the power output sun gear fixed end cover; The power input sun gear fixed end cover is provided with bolt holes matching the ring gear assembly and positioning grooves matching the ring gear assembly, and is also provided with a power input sun gear bearing hole. The power input sun gear fixed end cover is fixed to the corresponding position of the ring gear assembly by bolts; The power input sun gear assembly body includes a power input sun gear and a bearing, wherein the power input sun gear is fixedly mounted in a power input sun gear bearing hole of a fixed end cover of the power input sun gear by a bearing; The main body of the dual power planetary gear carrier assembly includes: a dual power planetary gear carrier, a power input planetary gear, a power output planetary gear, and a bearing. The power input planetary gear is a multi-layer gear, the small tooth layer of the power input planetary gear engages with the gear ring, and the large tooth layer engages with the sun gear. The power output planetary gear is a single-layer gear, which not only engages with the power input gear of the power output sun gear, but also engages with the gear ring. The intermediate sun gear assembly body includes an intermediate sun gear and a bearing. The intermediate sun gear not only engages with the power output planetary gear, but also engages with the power input planetary gear. The gear ring assembly body comprises: a primary gear ring, a secondary gear ring, and bolts, which are sequentially installed and fixed together by bolts; The power output sun gear assembly body includes a power output sun gear and a bearing. The power output sun gear is fixed to the power output sun gear fixed end cover by the bearing. The power output sun gear body includes a power input gear, a large shaft body, a bearing installation shaft body, and a power output shaft. The power output sun gear fixed end cover is fixed to the corresponding position of the ring gear assembly by bolts; The power input sun gear engages with the large gear layer of the planetary gear on the planetary gear carrier, the small gear layer of the planetary gear engages with the ring gear, and the power output planetary gear on the planetary gear carrier engages with not only the ring gear but also the power output sun gear; The power is transmitted from the power input sun gear to the power input planetary gear on the planetary gear carrier, the power input planetary gear then transmits the power to the planetary gear carrier, and the power output planetary gear on the planetary gear carrier then transmits the power to the power output sun gear; Power is input from one sun gear, passes through the planetary carrier assembly, and finally output from another sun gear; The power is input from the large tooth layer of the planetary gear of the planetary gear carrier, and output from the power output planetary gear of the planetary gear carrier.

[0006] The beneficial effects of the present invention are that it has the characteristics of strong practicability, high working efficiency and environmental protection, and when the speed of the power input part is equal to the speed of the power output part, the power output is greater than the power input of the labor-saving planetary gear system. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a simplified schematic diagram of the present invention Figure 2 This is a simplified diagram of gear meshing Figure 3 This is a simplified schematic diagram of the power input sun gear end cover and the power output sun gear fixed end cover Figure 4 This is a simplified diagram of the power input sun gear. Figure 5 This is a simplified schematic diagram of a dual-power planetary gear carrier. Figure 6 This is a simplified diagram of a planetary gear. Figure 7 This is a simplified diagram of the middle sun gear. Figure 8 This is a simplified diagram of the primary and secondary ring gears. Fig. 9 This is a simplified diagram of the power output sun gear. DETAILED DESCRIPTION

[0008] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0009] The technical solution of the present invention is: the main body includes a sun gear fixed end cover, a power input sun gear assembly, a dual power planetary gear carrier assembly, a ring gear assembly, an intermediate sun gear assembly, a power output sun gear assembly, and a power output sun gear fixed end cover.

[0010] The power input sun gear fixed end cover is provided with bolt holes matching the ring gear assembly, positioning grooves matching the ring gear assembly, and a power input sun gear bearing hole. The power input sun gear fixed end cover is fixed to the corresponding position of the ring gear assembly with bolts.

[0011] The power input sun gear assembly body comprises a power input sun gear and a bearing. The power input sun gear is fixedly mounted on a power input sun gear bearing hole of a fixed end cover of the power input sun gear by a bearing.

[0012] The power input sun gear body includes a power output gear, a large shaft, a bearing mounting shaft, and a power input shaft. One bottom surface of the power output gear is sequentially provided with a large shaft, a bearing mounting shaft, and a power input shaft, and the other bottom surface is sequentially provided with a large shaft and a bearing mounting shaft, and the bearing mounting shaft is installed with an inner ring of a bearing, and the outer ring of the bearing is installed in the bearing hole of a first-stage dual power planetary gear frame; the teeth of the power output gear are helical teeth, and they engage with the large tooth layer of the planetary gear on the planetary sun gear frame.

[0013] There are two groups of dual-power planetary gear frame assemblies, namely, a primary dual-power planetary gear frame assembly and a secondary dual-power planetary gear frame assembly; the dual-power planetary gear frame assembly, the main body of which includes: a dual-power planetary gear frame, a power input planetary gear, a power output planetary gear, and a bearing; the dual-power planetary gear frame is cylindrical, and a bottom surface is provided with a plurality of power input planetary gear mounting and fixing shafts, and the power input planetary gear mounting and fixing shaft, the end of which is close to the bottom surface, is a large shaft body for limiting the power input planetary gear, the large shaft body is connected to the mounting shaft body, and a snap ring groove is provided at the end of the mounting shaft body for limiting the power The output planetary gear has a plurality of power output planetary gear mounting and fixing shafts on the other bottom surface, which are consistent with the structure of the power input planetary gear mounting and fixing shaft; the power input planetary gear is a multi-layer gear, the small tooth layer of the power input planetary gear engages with the gear ring, and the large tooth layer engages with the sun gear, and is installed on the power input planetary mounting shaft body on the dual power planetary gear frame, the power output planetary gear is a single-layer gear, which not only engages with the power input gear of the power output sun gear, but also engages with the primary gear ring, and the dual power planetary gear frame is connected to the power output sun gear and the intermediate sun gear with a bearing.

[0014] The intermediate sun gear is not only between the first-stage dual-power planetary gear carrier assembly and the second-stage dual-power planetary gear carrier assembly, but also simultaneously engages with the power output planetary gear of the first-stage dual-power planetary gear carrier assembly and the large tooth layer of the power input gear of the second-stage dual-power planetary gear carrier assembly.

[0015] The intermediate sun gear assembly includes an intermediate sun gear and two bearings; the intermediate sun gear includes a transmission gear, a large shaft, and a bearing mounting shaft. The two bottom surfaces of the transmission gear are provided with a large shaft and a bearing mounting shaft in sequence. The bearing mounting shaft at one end of the transmission gear is installed with a bearing inner ring, and the outer ring of this bearing is installed in the bearing hole of the first-stage dual-power planetary gear frame; the bearing mounting shaft at the other end has a bearing inner ring, and the outer ring of this bearing is installed in the bearing hole of the second-stage dual-power planetary gear frame.

[0016] The structure of the two-stage dual-power planetary gear carrier assembly is consistent with that of the one-stage dual-power planetary gear carrier assembly. The large tooth layer of the power input planetary gear engages with the intermediate sun gear, and the small tooth layer engages with the secondary ring gear. The power output planetary gear not only engages with the power input gear of the power output sun gear, but also engages with the secondary ring gear. It is connected to the intermediate sun gear and the power output sun gear by bearings.

[0017] The gear ring assembly body comprises: a primary gear ring, a secondary gear ring bolt, and they are installed and fixed together in sequence with bolts.

[0018] The structure of the primary gear ring is consistent with that of the secondary gear ring, and is provided with a positioning groove, a bolt hole, an inner gear ring, and a planetary gear accommodating hole. The diameter of the inner gear ring is smaller than the diameter of the planetary gear accommodating hole. The teeth of the inner gear ring are helical teeth, and they engage with the small tooth layer of the power input planetary gear on the dual power planetary gear carrier, and also engage with the teeth of the power output planetary gear.

[0019] The power output sun gear assembly body includes a power output sun gear and a bearing. The power output sun gear is fixed to the power output sun gear fixed end cover with a bearing. The power output sun gear body includes a power input gear, a large shaft body, a bearing mounting shaft body, and a power output shaft. A bottom surface of the power input gear is sequentially provided with a large shaft body and a bearing mounting shaft body. The bearing mounting shaft body is installed with an inner ring of the bearing, and the outer ring of the bearing is installed in the bearing hole of the secondary dual power planetary gear frame; the other bottom surface is sequentially provided with a large shaft body, a bearing mounting shaft body, and a power output shaft.

[0020] The power output sun gear fixed end cover is fixed to the corresponding position of the ring gear assembly by bolts.

[0021] The structure of the power output sun gear fixed end cover is consistent with that of the power input sun gear fixed end cover.

[0022] The gear ring assembly is a fixed part and cannot rotate.

[0023] To summarize, the power output gear of the power input sun gear assembly engages with the large tooth layer of the planetary gear on the first-stage dual power planetary gear carrier assembly, and the small tooth layer of the planetary gear engages with the first-stage ring gear. The power output planetary gear on the first-stage dual power planetary gear carrier assembly engages not only with the intermediate sun gear, but also with the first-stage ring gear; the intermediate sun gear engages not only with the power output planetary gear on the first-stage dual power planetary gear carrier assembly, but also with the large tooth layer of the power input planetary gear on the second-stage dual power planetary gear carrier assembly; the small tooth layer of the power input planetary gear on the second-stage dual power planetary gear carrier assembly engages with the second-stage ring gear, and the power output planetary gear engages not only with the second-stage ring gear, but also with the power input gear of the power output gear assembly.

[0024] The power is transmitted from the sun gear of the power input sun gear assembly to the power input planetary gear on the first-stage double power planetary gear carrier. The power input planetary gear then transmits the power to the planetary gear carrier. The power output planetary gear on the planetary gear carrier then transmits the power to the intermediate sun gear. The intermediate sun gear then transmits the power to the power input planetary gear on the second-stage double power planetary gear carrier. The power input planetary gear then transmits the power to the planetary gear carrier. The planetary gear carrier then transmits the power to the power output planetary gear. The power output planetary gear then transmits the power to the power output sun gear.

[0025] Power is input from one sun gear, passes through the planetary carrier assembly, and finally output from the other sun gear.

[0026] In order to more intuitively and conveniently calculate the size of power input and external power output, as well as the size of the speed of the power input part and the speed of the power output part, because it is a gear transmission, the power arm takes the original length minus twice the tooth depth as the power arm, and the tooth depth is unified as 0.3 cm.

[0027] Assuming that the radius of the power input gear of the power input sun gear assembly is 4 cm, the power arm is set to be consistent with the resistance arm of the power output sun gear, offsetting each other, the resistance arm is 4 cm, and the fulcrum is at the center of the sun gear; The radius of the large tooth layer of the power input planetary gear on the first-stage dual-power planetary gear carrier assembly is 8 cm, and the radius of the small tooth layer is 2 cm, that is, the power arm is 8+2-0.6=9.4 cm, the resistance arm is 2 cm, and the fulcrum is at the position where the power input planetary gear contacts the first-stage ring gear; the radius of the power output planetary gear on the dual-power planetary gear carrier assembly is 5 cm, that is, the power arm is 5-0.6=4.4 cm, the resistance arm is 5+5=10 cm, and the fulcrum is at the position where the power output planetary gear contacts the first-stage ring gear; the distance from the center of the installation axis of the power input planetary gear on the dual-power planetary gear carrier to the center of the first-stage dual-power planetary gear carrier is 8+4=14 cm, and the distance from the center of the installation axis of the power output planetary gear on the dual-power planetary gear carrier to the center of the dual-power planetary gear carrier is 5+4=9 cm, that is, the power arm is 14 cm, the resistance arm is 9 cm, and the fulcrum is at the center of the dual-power planetary gear carrier; The radius of the middle sun gear is 4 cm, the power arm is 4-0.6=3.4 cm, the resistance arm is 4 cm, and the fulcrum is at the center of the middle sun gear; The radius of the large tooth layer of the power input planetary gear on the first-stage dual-power planetary gear carrier assembly is 8 cm, and the radius of the small tooth layer is 2 cm, that is, the power arm is 8+2-0.6=9.4 cm, the resistance arm is 2 cm, and the fulcrum is at the position where the power input planetary gear contacts the first-stage ring gear; The radius of the power output planetary gear on the secondary dual power planetary gear carrier assembly is 5 cm, that is, the power arm is 5-0.6=4.4 cm, the resistance arm is 5+5=10 cm, and the fulcrum is at the position where the power output planetary gear contacts the secondary gear ring; the distance from the center of the installation axis of the power input planetary gear on the dual power planetary gear carrier to the center of the dual power planetary gear carrier is 8+4=14 cm, and the distance from the center of the installation axis of the power output planetary gear on the dual power planetary gear carrier to the center of the dual power planetary gear carrier is 5+4=9 cm, that is, the power arm is 14 cm, the resistance arm is 9 cm, and the fulcrum is at the center of the dual power planetary gear carrier; The radius of the power input gear of the power output sun gear is 4 cm, that is, the power arm is 4-0.6=3.4 cm, and the resistance arm is consistent with the power arm of the sun gear, offsetting each other.

[0028] To sum up, the speed ratio of the power input sun gear and the dual power planetary gear carrier in the first-stage dual power planetary gear carrier assembly is (4+8+2+4)÷4=4.5, that is, the power input sun gear rotates 4.5 circles, and the dual power planetary gear carrier rotates one circle; the speed ratio of the dual power planetary gear carrier in the first-stage dual power planetary gear carrier assembly and the intermediate sun gear is (4+5+5+4)÷4=4.5, that is, the dual power planetary gear carrier rotates 1 circle, and the intermediate sun gear carrier rotates 4.5 circles; the speed ratio of the dual power planetary gear carrier in the second-stage dual power planetary gear carrier assembly and the intermediate sun gear is (4+8+2+4)÷4=4.5, that is, the intermediate sun gear rotates 4.5 circles, and the dual power planetary gear carrier rotates 1 circle; the speed ratio of the dual power planetary gear carrier in the second-stage dual power planetary gear carrier assembly and the power output sun gear is (4+5+5+4)÷4=4.5, that is, the dual power planetary gear carrier rotates 1 circle, and the power output sun gear carrier rotates 4.5 circles.

[0029] It can be seen from this that when the power input sun gear rotates 4.5 circles, the dual power planetary gear carrier of the first-stage dual power planetary gear carrier assembly rotates one circle, the intermediate sun gear rotates 4.5 circles, the dual power planetary gear carrier of the second-stage dual power planetary gear carrier assembly rotates one circle, and the power output sun gear rotates 4.5 circles, that is, the speed of the power output gear is not less than the speed of the sun gear.

[0030] Assuming that a power of 100 is input to the power input sun gear, the power output from the power output sun gear is: 100÷4×9.4÷2×14÷9×4.4÷10×3.4÷4×9.4÷2×14÷9×4.4÷10×3.4=747.6700303 To sum up, it can be seen that a smaller power can output a huge power through the above-mentioned labor-saving planetary gear system, and the speed of the power input part can be equal to the speed of the power output part; it has the characteristics of strong practicality, high work efficiency and green environmental protection, and when the speed of the power input part is equal to the speed of the power output part, the power output is greater than the power input.

[0031] The above are merely preferred embodiments for illustration, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. A labor-saving planetary gear train, characterized in that: The main body includes: a sun gear fixed end cover, a power input sun gear assembly, a dual power planetary gear carrier assembly, an intermediate sun output assembly, a ring gear assembly, a power output sun gear assembly, and a power output sun gear fixed end cover; The power input sun gear fixed end cover is provided with bolt holes matching the ring gear assembly and positioning grooves matching the ring gear assembly, and is also provided with a power input sun gear bearing hole. The power input sun gear fixed end cover is fixed to the corresponding position of the ring gear assembly by bolts; The power input sun gear assembly body includes a power input sun gear and a bearing, wherein the power input sun gear is fixedly mounted in a power input sun gear bearing hole of a fixed end cover of the power input sun gear by a bearing; The main body of the dual power planetary gear carrier assembly includes: a dual power planetary gear carrier, a power input planetary gear, a power output planetary gear, and a bearing. The power input planetary gear is a multi-layer gear, the small tooth layer of the power input planetary gear bites the gear ring, and the large tooth layer bites the sun gear. The power output planetary gear is a single-layer gear, which not only bites the power input gear of the power output sun gear, but also bites the gear ring. The intermediate sun gear assembly body includes an intermediate sun gear and a bearing. The intermediate sun gear not only engages with the power output planetary gear, but also engages with the power input planetary gear. The gear ring assembly body comprises: a primary gear ring, a secondary gear ring, and bolts, which are sequentially installed and fixed together by bolts; The power output sun gear assembly body includes a power output sun gear and a bearing. The power output sun gear is fixed to the power output sun gear fixed end cover by the bearing. The power output sun gear body includes a power input gear, a large shaft body, a bearing installation shaft body, and a power output shaft. The power output sun gear fixed end cover is fixed to the corresponding position of the ring gear assembly by bolts; The power input sun gear engages with the large gear layer of the planetary gear on the planetary gear carrier, the small gear layer of the planetary gear engages with the ring gear, and the power output planetary gear on the planetary gear carrier engages with not only the ring gear but also the power output sun gear; The power is transmitted from the power input sun gear to the power input planetary gear on the planetary gear carrier, the power input planetary gear then transmits the power to the planetary gear carrier, and the power output planetary gear on the planetary gear carrier then transmits the power to the power output sun gear; Power is input from one sun gear, passes through the planetary carrier assembly, and finally output from another sun gear; The power is input from the large tooth layer of the planetary gear of the planetary gear carrier, and output from the power output planetary gear of the planetary gear carrier.

2. According to claim 1, a labor-saving planetary gear train, characterized in that: The power input sun gear body includes a power output gear, a large shaft, a bearing mounting shaft, and a power input shaft. One bottom surface of the power output gear is sequentially provided with a large shaft, a bearing mounting shaft, and a power input shaft, and the other bottom surface is sequentially provided with a large shaft and a bearing mounting shaft, and the bearing mounting shaft is installed with an inner ring of a bearing, and the outer ring of the bearing is installed in the bearing hole of a first-stage dual power planetary gear frame; the teeth of the power output gear are helical teeth, and they engage with the large tooth layer of the planetary gear on the planetary sun gear frame.

3. According to claim 1, a labor-saving planetary gear train, characterized in that: There are two groups of dual-power planetary gear carrier assemblies, namely, a primary dual-power planetary gear carrier assembly and a secondary dual-power planetary gear carrier assembly; The dual-power planetary gear carrier assembly mainly includes: a dual-power planetary gear carrier, a power input planetary gear, a power output planetary gear, and a bearing; The dual power planetary gear carrier is cylindrical, and a bottom surface is provided with multiple power input planetary gear mounting and fixing shafts. The power input planetary gear mounting and fixing shaft, the end close to the bottom surface is a large shaft body, which is used to limit the power input planetary gear, the large shaft body is connected to the mounting shaft body, and a retaining ring groove is provided at the end position of the mounting shaft body, which is used to limit the power output planetary gear, and another bottom surface is provided with multiple power output planetary gear mounting and fixing shafts, which are consistent with the structure of the power input planetary gear mounting and fixing shaft; the power input planetary gear is a multi-layer gear, the small tooth layer of the power input planetary gear bites the ring gear, and the large tooth layer bites the sun gear, and the power input planetary mounting shaft body installed on the dual power planetary gear carrier, the power output planetary gear is a single-layer gear, which not only bites the power input gear of the power output sun gear, but also bites the primary ring gear, and the dual power planetary gear carrier is connected to the power output sun gear and the intermediate sun gear with a bearing.

4. According to claim 1, a labor-saving planetary gear train, characterized in that The intermediate sun gear assembly includes an intermediate sun gear and two bearings; the intermediate sun gear includes a transmission gear, a large shaft, and a bearing mounting shaft. The two bottom surfaces of the transmission gear are provided with a large shaft and a bearing mounting shaft in sequence. The bearing mounting shaft at one end of the transmission gear is installed with a bearing inner ring, and the outer ring of this bearing is installed in the bearing hole of the first-stage dual-power planetary gear frame; the bearing mounting shaft at the other end has a bearing inner ring, and the outer ring of this bearing is installed in the bearing hole of the second-stage dual-power planetary gear frame.

5. According to claim 1, a labor-saving planetary gear train, characterized in that: The structure of the two-stage dual-power planetary gear carrier assembly is consistent with that of the one-stage dual-power planetary gear carrier assembly. The large tooth layer of the power input planetary gear engages with the intermediate sun gear, and the small tooth layer engages with the secondary ring gear. The power output planetary gear not only engages with the power input gear of the power output sun gear, but also engages with the secondary ring gear. It is connected to the intermediate sun gear and the power output sun gear by bearings.

6. According to claim 1, a labor-saving planetary gear train, characterized in that: The gear ring assembly body comprises: a primary gear ring, a secondary gear ring, and bolts, which are sequentially installed and fixed together by bolts; The structure of the primary gear ring is consistent with that of the secondary gear ring, and is provided with a positioning groove, a bolt hole, an inner gear ring, and a planetary gear accommodating hole. The diameter of the inner gear ring is smaller than the diameter of the planetary gear accommodating hole. The teeth of the inner gear ring are helical teeth, and they engage with the small tooth layer of the power input planetary gear on the dual power planetary gear carrier, and also engage with the teeth of the power output planetary gear.

7. According to claim 1, a labor-saving planetary gear train, characterized in that: The power output sun gear assembly body includes a power output sun gear and a bearing. The power output sun gear is fixed to the power output sun gear fixed end cover with a bearing. The power output sun gear body includes a power input gear, a large shaft body, a bearing mounting shaft body, and a power output shaft. A bottom surface of the power input gear is sequentially provided with a large shaft body and a bearing mounting shaft body. The bearing mounting shaft body is installed with an inner ring of the bearing, and the outer ring of the bearing is installed in the bearing hole of the secondary dual power planetary gear frame; the other bottom surface is sequentially provided with a large shaft body, a bearing mounting shaft body, and a power output shaft.

8. According to claim 1, a labor-saving planetary gear train, characterized in that: The structure of the power output sun gear fixed end cover is consistent with that of the power input sun gear fixed end cover.

9. According to claim 1, a labor-saving planetary gear train, characterized in that: The power output gear of the power input sun gear assembly engages with the large tooth layer of the planetary gear on the first-stage dual power planetary gear carrier assembly, and the small tooth layer of the planetary gear engages with the first-stage ring gear. The power output planetary gear on the first-stage dual power planetary gear carrier assembly not only engages with the intermediate sun gear, but also engages with the first-stage ring gear; the intermediate sun gear not only engages with the power output planetary gear on the first-stage dual power planetary gear carrier assembly, but also engages with the large tooth layer of the power input planetary gear on the second-stage dual power planetary gear carrier assembly; the small tooth layer of the power input planetary gear on the second-stage dual power planetary gear carrier assembly engages with the second-stage ring gear, and the power output planetary gear engages with not only the second-stage ring gear, but also engages with the power input gear of the power output gear assembly.

10. According to claim 1, a labor-saving planetary gear train, characterized in that: The power is transmitted from the sun gear of the power input sun gear assembly to the power input planetary gear on the first-stage double power planetary gear carrier. The power input planetary gear then transmits the power to the planetary gear carrier. The power output planetary gear on the planetary gear carrier then transmits the power to the intermediate sun gear. The intermediate sun gear then transmits the power to the power input planetary gear on the second-stage double power planetary gear carrier. The power input planetary gear then transmits the power to the planetary gear carrier. The planetary gear carrier then transmits the power to the power output planetary gear. The power output planetary gear then transmits the power to the power output sun gear.

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