A planetary gear set nested gearbox

Abstract

The present application relates to the technical field of gearbox, in particular to a planetary gear set nested gearbox, which comprises an auxiliary matching mechanism, a speed change execution mechanism arranged in the auxiliary matching mechanism and a self-lubricating mechanism installed on the auxiliary matching mechanism; the auxiliary matching mechanism comprises a reinforced shell. By optimizing the structure of the existing gearbox, and installing a rear oil cover and a front oil cover on the outer part of the rear cover plate and the front cover plate respectively, when the transmission shaft drives the external sun gear to rotate, the gears in the box will rotate, at the same time, the two groups of deflection gears driven by the two drive gears will drive the shaft rod and the screw rod to rotate at the same speed, and the lubricating oil with high temperature and high flowability can be quickly circulated in the circulating channel, until the oil passes through the U-shaped flow guide pipe, the external refrigeration coil pipe can efficiently cool and radiate the circulating oil, so as to improve the efficiency of the oil and gear operation in the box.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, specifically to a planetary gear set nested gearbox. Background Technology

[0002] A planetary gearbox is a mechanical transmission device that uses a planetary gear mechanism to transmit power and change speed. Its core structure consists of four main components: the sun gear, planet gears, ring gear, and planet carrier. Different components are fixed by elements such as clutches and brakes, which can switch between different gears and transmission ratios.

[0003] Planetary gear transmissions have a complex internal structure. The densely packed gears rotate at high speed within a highly enclosed housing, causing rapid heating. In this high-temperature environment, the lubricating oil becomes increasingly viscous due to the repeated compression by the gears, which accelerates its oxidation and deterioration. Furthermore, the complex housing makes it difficult to effectively and conveniently replace the deteriorated oil. As a result, the deterioration of the base oil's performance eventually leads to increased wear on the gears inside the transmission, which can severely reduce the actual service life of the transmission.

[0004] In view of this, a planetary gear set nested gearbox was designed to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted in this invention is as follows: A nested planetary gearbox includes an auxiliary support mechanism, a transmission actuator disposed within the auxiliary support mechanism, and a self-lubricating mechanism mounted on the auxiliary support mechanism. The auxiliary support mechanism includes a reinforcing housing, one end of which has a rear cover plate, and the other end of which has a front cover plate. Bearings are installed in holes in the middle of both the rear and front cover plates. The transmission actuator includes a drive shaft mounted within two bearings, and two symmetrically distributed drive gears are mounted on the rod end of the drive shaft extending to the outside of the two bearings. The self-lubricating mechanism includes a rear oil cover disposed outside the rear cover plate and a front oil cover disposed outside the front cover plate. Oil change pipes are installed in pipe sections outside both the rear and front oil covers, and U-shaped guide pipes are installed on both oil change pipes. A cooling coil is disposed outside the U-shaped guide pipe.

[0007] In a preferred embodiment, the present invention can be further configured such that: both ends of the reinforced outer shell are provided with a plurality of studs evenly distributed thereon, and the rear cover plate and the front cover plate are fixedly mounted on the plurality of studs by a plurality of nuts.

[0008] In a preferred embodiment, the present invention may be further configured such that: two pads are provided on the outside of the reinforcing shell, two clamps are symmetrically distributed on the outside of the pads, and two first bolts are inserted into the plate end of the pads.

[0009] In a preferred embodiment, the present invention may be further configured such that: a sun gear is fixedly mounted on the outside of the transmission shaft, and four planet carriers are mounted in the inner cavity of the reinforcing housing, wherein multiple sets of planet gears are movably mounted between two planet carriers, and an internal gear ring is movably mounted in the cavity at the end of the reinforcing housing.

[0010] In a preferred embodiment, the present invention can be further configured such that: the top and bottom of the rear oil cover are provided with two symmetrically distributed insertion holes, and two symmetrically distributed filter elements are adapted to be inserted into the two insertion holes; a baffle is fixedly installed on the outside of the filter element; and a third bolt is inserted into the end of the baffle that is attached to the outer wall of the rear oil cover.

[0011] In a preferred embodiment, the present invention can be further configured such that: a double-layer filter screen is provided in the fan-shaped groove on one side of the filter element, and the two filter elements after being closed are used to efficiently block the circulating lubricating oil.

[0012] In a preferred embodiment, the present invention can be further configured such that: an oil inlet pipe is provided on the outside of the rear oil cover, and an oil outlet pipe is provided on the outside of the front oil cover, and both the oil inlet pipe and the oil outlet pipe are fitted with caps; A fixed end is fixedly installed on the U-shaped guide tube, and an oil measuring caliper is installed inside the fixed end, with the flexible segment of the oil measuring caliper fitting through the interior of the U-shaped guide tube.

[0013] In a preferred embodiment, the present invention can be further configured as follows: a first positioning element is fixedly installed at one end of the oil change pipe, two second positioning elements are symmetrically distributed at both ends of the U-shaped guide pipe, and a horizontally placed shaft is movably installed inside the first and second positioning elements. A screw is installed on the shaft section that extends through the inner cavity of the oil change pipe, and a deflection gear is installed at the outer end of the shaft. The deflecting gear meshes with the drive gear.

[0014] In a preferred embodiment, the present invention can be further configured such that: two symmetrically distributed protective shells are installed in the middle of the U-shaped guide tube, and after closing, the two protective shells are adapted to be clamped on the outside of the U-shaped guide tube; and external flexible hoses are installed on both sections of the refrigeration coil.

[0015] In a preferred embodiment, the present invention can be further configured such that: multiple second bolts are inserted into the flanges at the inner ends of both the rear oil cover and the front oil cover; the rear oil cover is fixed to the middle of the outer side of the rear cover plate by the multiple second bolts; and the front oil cover is fixed to the middle of the outer side of the front cover plate by the multiple second bolts.

[0016] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows: 1. This invention optimizes the structure of the existing gearbox and installs a rear oil cover and a front oil cover on the outside of the rear cover and the front cover, respectively. When the drive shaft drives its external sun gear to rotate, the gears inside the gearbox will rotate accordingly. At the same time, the two sets of deflecting gears assisted by the two drive gears will drive the shaft and screw to rotate at the same speed. The heated and highly fluid lubricating oil can be quickly circulated and transported in the circulation channel until the oil passes through the U-shaped guide pipe. The external cooling coil can efficiently cool and dissipate heat for the circulating oil, which facilitates the improvement of the efficiency of the oil and gear operation inside the gearbox.

[0017] 2. This invention inserts two symmetrically distributed filter elements into the rear oil cover until the two filter elements are located outside the hole in the middle of the rear cover plate after closing. As the high-flow lubricating oil circulates and transfers along the internal circulation pipeline, the inferior contaminants generated by the squeezing and friction of the oil due to gears can be effectively intercepted. Ultimately, it can avoid the risk of inferior contaminants accumulating in the tank and increasing the wear on the gears.

[0018] 3. This invention sets a fixed end on the U-shaped guide pipe and installs an oil measuring caliper inside the fixed end. The oil quality is checked by periodically sampling the oil measuring caliper. When the oil performance deteriorates significantly, an external pump and pipeline are connected to the oil inlet and outlet pipes respectively. Finally, the external pump transfers new oil to the circulation pipeline through the oil inlet pipe. The low-speed rotating variable speed actuator can quickly replace the old and new oil in the pipeline. Finally, the old oil is squeezed out by the new oil and discharged through the outlet pipe, thus achieving efficient oil change without the gears running idle. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the use of the present invention; Figure 2 This is a three-dimensional schematic diagram of the present invention; Figure 3 For the present invention Figure 2 A diagram showing the view from below; Figure 4 This is a schematic diagram of the auxiliary supporting mechanism of the present invention; Figure 5 For the present invention Figure 4 A partial top view diagram; Figure 6This is a schematic diagram of the self-lubricating mechanism of the present invention; Figure 7 For the present invention Figure 6 An explosion diagram; Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle; Figure 9 For the present invention Figure 7 Enlarged diagram of point B in the middle.

[0020] Figure label: 100. Auxiliary supporting mechanism; 110. Reinforced outer shell; 1101. Stud; 1102. Spacer; 120. Fixture; 1201. First bolt; 130. Rear cover plate; 140. Front cover plate; 150. Bearing; 200. Speed-changing actuator; 210. Drive shaft; 220. Drive gear; 230. Sun gear; 240. Planet gears; 250. Planet carrier; 260. Internal gear ring; 300. Self-lubricating mechanism; 310. Rear oil cover; 3101. Oil inlet pipe; 320. Front oil cover; 3201. Oil drain pipe; 330. Second bolt; 340. Cover; 350. Oil change pipe; 3501. First positioning component; 360. Shaft; 3601. Screw; 3602. Deflecting gear; 370. Filter element; 3701. Baffle; 3702. Third bolt; 380. U-shaped guide pipe; 3801. Protective housing; 3802. Second positioning component; 3803. Fixed end; 3804. Oil measuring caliper; 390. Refrigeration coil; 3901. External hose. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0022] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0023] The following describes, with reference to the accompanying drawings, some embodiments of a planetary gear set nested gearbox provided by the present invention.

[0024] Example 1: Combination Figures 1 to 9As shown, the present invention provides a nested planetary gear set transmission, including an auxiliary supporting mechanism 100, a transmission actuator 200 disposed within the auxiliary supporting mechanism 100, and a self-lubricating mechanism 300 mounted on the auxiliary supporting mechanism 100. The auxiliary supporting mechanism 100 provides effective sealing protection for the transmission actuator 200 and facilitates enhanced support for the self-lubricating mechanism 300. The self-lubricating mechanism 300 facilitates the circulation and transfer of lubricating oil within the sealed cavity, thereby facilitating the cooling and decontamination of the lubricating oil.

[0025] The auxiliary supporting mechanism 100 includes a reinforcing shell 110, a rear cover plate 130 at one end of the reinforcing shell 110, and a front cover plate 140 at the other end of the reinforcing shell 110. Bearings 150 are installed in the holes in the middle of the rear cover plate 130 and the front cover plate 140. Multiple studs 1101 are evenly distributed at both ends of the reinforcing shell 110, and the rear cover plate 130 and the front cover plate 140 are fixedly installed on the multiple studs by multiple nuts. The outer shell 110 is reinforced with two pads 1102 on the outside. Two clamps 120 are symmetrically distributed on the outside of the pads 1102. Two first bolts 1201 are inserted into the plate end of the pads 1102. The speed change actuator 200 includes a drive shaft 210 installed in two bearings 150. Two drive gears 220 are symmetrically distributed on the rod end of the drive shaft 210 extending to the outside of the two bearings 150. A sun gear 230 is fixedly installed on the outside of the drive shaft 210. Four planet carriers 250 are installed in the inner cavity of the reinforcing housing 110. Multiple sets of planet gears 240 are movably installed between two planet carriers 250. An internal gear ring 260 is movably installed in the cavity at the end of the reinforcing housing 110. The self-lubricating mechanism 300 includes a rear oil cover 310 disposed outside the rear cover plate 130 and a front oil cover 320 disposed outside the front cover plate 140. Both the rear oil cover 310 and the front oil cover 320 are equipped with oil change pipes 350 in the pipe sections outside the rear oil cover 310 and the front oil cover 320. U-shaped guide pipes 380 are installed on the two oil change pipes 350. A cooling coil 390 is disposed outside the U-shaped guide pipe 380. Two symmetrically distributed protective shells 3801 are installed in the middle of the U-shaped guide pipe 380. After closing, the two protective shells 3801 are adapted to be clamped on the outside of the U-shaped guide pipe 380. External hoses 3901 are installed on both pipe sections of the cooling coil 390. Multiple second bolts 330 are inserted into the flanges at the inner ends of the rear oil cover 310 and the front oil cover 320. The rear oil cover 310 is fixed to the middle of the outer side of the rear cover plate 130 by multiple second bolts 330, and the front oil cover 320 is fixed to the middle of the outer side of the front cover plate 140 by multiple second bolts 330.

[0026] Preferably, the end face of the rear cover 130 facing the reinforcing housing 110 has a flat structure, and the end face of the front cover 140 facing the reinforcing housing 110 has a funnel-shaped structure. In order to facilitate the sealing of the mating ports of the reinforcing housing 110, the rear cover 130 and the front cover 140 when they are closed, sealing rings need to be installed on the inner ports of the rear cover 130 and the front cover 140 to avoid the risk of lubricating oil overflow. When the lubricating oil flows along the inner cavity of the sealed rear reinforced housing 110, rear cover plate 130 and front cover plate 140, the heated and highly fluid lubricating oil will circulate and transfer along the inner cavity of the self-lubricating mechanism 300. Finally, the lubricating oil in the external circulation mode can be effectively cooled. The efficiency of cooling the high-temperature lubricating oil is achieved through the variable diameter pipeline. When the cooled oil circulates back into the inner cavity of the reinforced housing 110, the entire speed change actuator 200 embedded in the inner cavity of the reinforced housing 110 can be effectively cooled. This further ensures the efficiency of the speed change actuator 200 in the sealed cavity, avoids the deterioration of the oil performance caused by the high-speed rotation of the gears, and can also improve the service life of the gears. Among them, the inner walls of the rear oil cover 310, the front oil cover 320, the two oil change pipes 350 and the U-shaped guide pipe 380 are all coated with a smooth coating structure. The variable diameter pipeline from the inner cavity of the two oil change pipes 350 to the inner cavity of the U-shaped guide pipe 380 can accelerate the efficiency of natural heat dissipation of lubricating oil.

[0027] Example 2: Combination Figure 2 and Figure 7 As shown, based on Embodiment 1, the rear oil cover 310 has two symmetrically distributed insertion holes at the top and bottom, and two symmetrically distributed filter elements 370 are adapted to be inserted into the two insertion holes. A baffle 3701 is fixedly installed on the outside of the filter element 370, and a third bolt 3702 is inserted into the plate end of the baffle 3701 that fits against the outer wall of the rear oil cover 310. A double-layer filter screen is installed in the fan-shaped groove on one side of the filter element 370. When closed, the two filter elements 370 are used to efficiently filter out contaminants from the circulating lubricating oil.

[0028] Preferably, the fan-shaped groove at one end of the filter element 370 has a recessed structure. After the two filter elements 370 are closed and joined together, the circular groove formed, together with the double-layer filter screen, can efficiently trap dirt in the circulating lubricating oil. The recessed fan-shaped groove can also safely store dirt under the pressure of the circulating oil. When it is necessary to replace the two filter elements 370 periodically, the two third bolts 3702 are reversed until the two sets of baffles 3701 and the filter elements 370 are pulled outward, which can ultimately achieve efficient replacement of the old and new filter elements 370. At the same time, it can avoid the risk of wear caused by dirt generated by oil deterioration on the inner cavity of the auxiliary matching mechanism 100 and its internal gears.

[0029] Example 3: Combination Figures 7 to 9 As shown, in the above embodiment, an oil inlet pipe 3101 is provided on the outside of the rear oil cover 310, and an oil outlet pipe 3201 is provided on the outside of the front oil cover 320. Both the oil inlet pipe 3101 and the oil outlet pipe 3201 are equipped with caps 340. A fixed end 3803 is fixedly installed on the U-shaped guide tube 380. An oil measuring caliper 3804 is installed inside the fixed end 3803, and the flexible section of the oil measuring caliper 3804 is adapted to penetrate into the interior of the U-shaped guide tube 380. One end of the oil change pipe 350 is fixedly installed with a first positioning component 3501, and two symmetrically distributed second positioning components 3802 are installed at both ends of the U-shaped guide pipe 380. A horizontally placed shaft 360 is movably installed inside the first positioning component 3501 and the second positioning component 3802. A screw 3601 is installed on the shaft 360 that passes through the inner cavity of the oil change pipe 350, and a deflection gear 3602 is installed on the outer end of the shaft 360. The deflection gear 3602 meshes with the drive gear 220.

[0030] Preferably, sealing gaskets can be added to the inner ports of the rear oil cover 310 and the front oil cover 320. The sealing between the rear oil cover 310 and the rear cover plate 130 and the front oil cover 320 and the front cover plate 140 can be further enhanced by the two sealing gaskets. By periodically removing the oil measuring caliper 3804, the quality of the oil on the caliper 3804 is checked by manual observation. When the oil shows obvious deterioration and performance degradation, the two caps 340 are removed, and two external pipes are connected to the oil inlet pipe 3101, the oil outlet pipe 3201, and the external pump respectively. When the external pump runs and transfers new oil from the oil inlet pipe 3101 to the inside of the circulation pipeline, the old oil inside the circulation pipeline is squeezed by the new oil when the speed change actuator 200 rotates at low speed. By circulating the oil inside the circulation pipeline twice, the effect of draining the old oil is improved. Among them, one screw 3601 in the rear replacement oil pipe 350 is used to feed the oil inside the U-shaped guide pipe 380 into the inner cavity of the rear oil cover 310, and the other screw 3601 in the front replacement oil pipe 350 is used to feed the oil inside the inner cavity of the front oil cover 320 into the U-shaped guide pipe 380.

[0031] The working principle and usage process of this invention are as follows: The speed-changing actuator 200 is pre-assembled and installed in the pre-set cavity inside the reinforcing housing 110 until the input and output ends of the drive shaft 210 penetrate to the outside of the reinforcing housing 110. Then, the rear cover plate 130 and the front cover plate 140 are respectively installed on the multiple studs 1101 evenly distributed at both ends of the reinforcing housing 110 using multiple nuts. At this time, the multiple gears set on the rod end in the middle of the drive shaft 210 will be sealed and clamped. The two ends of the drive shaft 210 are respectively installed in the holes in the middle of the rear cover plate 130 and the front cover plate 140 through two bearings 150. Then, the two drive gears 220 are fixedly installed on the rod ends at both ends of the drive shaft 210. At this time, the drive gears 220 will be located outside the bearings 150. Next, multiple second bolts 330 are used to fix the rear oil cover 310 and the front oil cover 320 to the outside of the rear cover plate 130 and the front cover plate 140, respectively. The two drive gears 220 installed at both ends of the transmission shaft 210 are located in the inner cavity of the rear oil cover 310 and the front oil cover 320, respectively. Two oil changing pipes 350 are connected to the external pipe sections of the rear oil cover 310 and the front oil cover 320, respectively. When the two oil changing pipes 350 are connected through the U-shaped guide pipe 380, the U-shaped pipeline can provide an effective self-circulation channel for the lubricating oil in the inner cavity of the sealed rear transmission actuator 200. In actual use, an external pump and two external hoses 3901 are used to circulate the refrigerant along the internal circulation of the refrigeration coil 390 until the refrigeration coil 390 cools the lubricating oil in the middle of the U-shaped guide tube 380 and its inner cavity. As the drive shaft 210 rotates, the two drive gears 220 at both ends assist in rotating the two sets of deflection gears 3602, shaft 360, and screw 3601. The rear screw 3601 is used to feed the lubricating oil into the inner cavity of the rear oil cover 310, and the front screw 3601 is used for... The lubricating oil inside the front oil cover 320 is extracted and transferred to the U-shaped guide tube 380, which facilitates the rapid circulation and transfer of the high-temperature lubricating oil under high flow conditions. After being cooled by the cooling coil 390, it is recirculated into the inner cavity of the transmission actuator 200. This process can dissipate the heat generated by the high-speed rotation friction of the inner cavity of the reinforcing shell 110 and its internal dimensions. After the lubricating oil is circulated, the two closed filter elements 370 can actively filter the lubricating oil after it passes through the inner cavity of the rear oil cover 310. During regular lubricant quality checks, to facilitate rapid replacement of old and new lubricant, the quality of the oil in the pipe is sampled using an oil gauge 3804. When the lubricant quality drops, the two caps 340 are removed, and new oil is injected using two external pipes and a pump. The old oil can be discharged from the drain pipe 3201 as the transmission actuator 200 rotates. The dirt remaining on the two filter elements 370 can be quickly removed. This process also facilitates rapid maintenance of the inner cavity of the reinforced housing 110 and the transmission actuator 200.

[0032] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A nested planetary gear set transmission, comprising an auxiliary supporting mechanism (100), characterized in that, It also includes a speed-changing actuator (200) installed in the auxiliary supporting mechanism (100) and a self-lubricating mechanism (300) installed on the auxiliary supporting mechanism (100). The auxiliary supporting mechanism (100) includes a reinforcing shell (110), one end of which is provided with a rear cover plate (130), and the other end of which is provided with a front cover plate (140). Bearings (150) are installed in the holes in the middle of the rear cover plate (130) and the front cover plate (140). The speed change actuator (200) includes a drive shaft (210) installed in two bearings (150), and two drive gears (220) are symmetrically distributed on the rod end of the drive shaft (210) extending to the outside of the two bearings (150). The self-lubricating mechanism (300) includes a rear oil cover (310) located outside the rear cover plate (130) and a front oil cover (320) located outside the front cover plate (140). Both the rear oil cover (310) and the front oil cover (320) are equipped with oil change pipes (350) in the pipe sections outside the rear oil cover (310) and the front oil cover (320). U-shaped guide pipes (380) are installed on the two oil change pipes (350). A cooling coil (390) is provided outside the U-shaped guide pipe (380).

2. The nested planetary gear set transmission according to claim 1, characterized in that, Both ends of the reinforced outer shell (110) are provided with a plurality of studs (1101) evenly distributed, and the rear cover plate (130) and the front cover plate (140) are fixedly installed on the plurality of studs by a plurality of nuts.

3. A nested planetary gear set transmission according to claim 1, characterized in that, The reinforced outer shell (110) has two pads (1102) on its outside. The pads (1102) have two symmetrically distributed clamps (120) on their outside. The clamps (120) are fitted into the plate end of the pads (1102) and two first bolts (1201) are inserted.

4. A nested planetary gear set transmission according to claim 1, characterized in that, A sun gear (230) is fixedly installed on the outside of the drive shaft (210), and four planet carriers (250) are installed in the inner cavity of the reinforcing housing (110). Multiple sets of planet gears (240) are movably installed between two planet carriers (250), and an internal gear ring (260) is movably installed in the cavity at the end of the reinforcing housing (110).

5. A nested planetary gear set transmission according to claim 1, characterized in that, The rear oil cover (310) has two symmetrically distributed insertion holes at its top and bottom, and two symmetrically distributed filter elements (370) are adapted to be inserted into the two insertion holes. A baffle (3701) is fixedly installed on the outside of the filter element (370). A third bolt (3702) is inserted into the end of the baffle (3701) that is attached to the outer wall of the rear oil cover (310).

6. A nested planetary gear set transmission according to claim 5, characterized in that, A double-layer filter screen is provided in the fan-shaped groove on one side of the filter element (370). The two filter elements (370) after being closed are used to efficiently filter the circulating lubricating oil.

7. A nested planetary gear set transmission according to claim 1, characterized in that, The rear oil cover (310) is provided with an oil inlet pipe (3101) on the outside, and the front oil cover (320) is provided with an oil outlet pipe (3201) on the outside, and both the oil inlet pipe (3101) and the oil outlet pipe (3201) are equipped with caps (340). A fixed end (3803) is fixedly installed on the U-shaped guide tube (380), and an oil measuring caliper (3804) is installed inside the fixed end (3803), with the flexible section of the oil measuring caliper (3804) adapted to penetrate into the interior of the U-shaped guide tube (380).

8. A nested planetary gear set transmission according to claim 1, characterized in that, One end of the oil change pipe (350) is fixedly installed with a first positioning member (3501), and two symmetrically distributed second positioning members (3802) are installed at both ends of the U-shaped guide pipe (380). A horizontally placed shaft (360) is movably installed inside the first positioning member (3501) and the second positioning member (3802). A screw (3601) is installed on the shaft (360) that passes through the inner cavity of the oil change pipe (350), and a deflection gear (3602) is installed at the outer end of the shaft (360). The deflection gear (3602) meshes with the drive gear (220).

9. A nested planetary gear set transmission according to claim 1, characterized in that, Two symmetrically distributed protective shells (3801) are installed in the middle of the U-shaped guide tube (380), and after closing, the two protective shells (3801) are adapted to be clamped on the outside of the U-shaped guide tube (380). External hoses (3901) are installed on both sections of the refrigeration coil (390).

10. A nested planetary gear set transmission according to claim 1, characterized in that, Multiple second bolts (330) are inserted into the flanges at the inner ends of both the rear oil cover (310) and the front oil cover (320). The rear oil cover (310) is fixed to the middle of the outer side of the rear cover plate (130) by multiple second bolts (330), and the front oil cover (320) is fixed to the middle of the outer side of the front cover plate (140) by multiple second bolts (330).

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