Compact and efficient three-stage gearbox mechanism

Abstract

The invention relates to the technical field of automobile mechanical transmission, and discloses a compact and efficient three-stage gearbox mechanism which comprises a metal shell, a top supporting disc, inner teeth and a plastic shell, the top supporting disc is installed in the metal shell, the inner teeth are installed at the bottom of the metal shell, and the plastic shell is installed in the metal shell. The plastic shell is installed at the bottoms of the inner teeth, teeth are arranged on the inner sides of the inner teeth, a first boss is arranged in the middle of the metal shell, an upper supporting disc is arranged below the inner teeth, a middle supporting disc is arranged below the upper supporting disc, and a bottom supporting disc is arranged below the middle supporting disc. The upper supporting disc, the middle supporting disc and the bottom supporting disc are all installed in the plastic shell, and a middle bearing is installed in the center of the middle supporting disc. By arranging a series of structures, the problems that an existing gearbox is complex in structure, low in transmission efficiency and poor in stability are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive mechanical transmissions, and particularly to a compact and efficient three-stage gearbox mechanism. Background Art

[0002] At present, with the booming development of the automotive industry, consumers' requirements for the comfort and functionality inside the vehicle are increasing day by day. The adjustment functions of components such as seats and table boards inside the vehicle have become important indicators for measuring the quality of the vehicle. In the existing technology, as a key component for power transmission and speed change, the performance of the gearbox directly affects the working efficiency and stability of the entire device.

[0003] However, traditional gearboxes have many deficiencies. For example, some simple transmission structures cannot provide enough torque to drive high-load devices, while complex torque amplification structures will increase the manufacturing cost and maintenance difficulty. The transmission efficiency of some gearboxes is relatively low, resulting in a large amount of energy loss during power transmission; there are also some gearboxes with poor stability and reliability, prone to failures, which affect the normal operation of the device. Therefore, we propose a compact and efficient three-stage gearbox mechanism. Summary of the Invention

[0004] The purpose of the present invention is to provide a compact and efficient three-stage gearbox mechanism to solve the problems existing in the existing gearboxes, such as complex structure, low transmission efficiency, and poor stability, and to achieve efficient power transmission and stable speed change. Multistage speed change and efficient torque amplification are realized through the combination of worm and worm gear and multi-stage planetary gear transmission, and the stability is improved by a reasonable support and meshing structure. In practice, it can adapt to complex working conditions, optimize power transmission to improve energy efficiency, and because it is easy to assemble and debug and has high stability, it can reduce the manufacturing and maintenance costs of the device and improve the enterprise benefits.

[0005] The above technical object of the present invention is achieved through the following technical solutions: A compact and efficient three-stage gearbox mechanism, including a metal housing, a top support disk, internal teeth, and a plastic housing. The top support disk is installed inside the metal housing. The internal teeth are installed at the bottom of the metal housing. The plastic housing is installed at the bottom of the internal teeth. Tooth teeth are provided inside the internal teeth. A first boss is provided in the middle part of the metal housing. An upper support disk is provided below the internal teeth. A middle support disk is provided below the upper support disk. A bottom support disk is provided below the middle support disk. The upper support disk, the middle support disk, and the bottom support disk are all installed inside the plastic housing. The plastic housing can effectively prevent impurities such as dust, moisture, and oil stains from entering the inside of the gearbox, avoid interference of these impurities with the meshing and transmission of the gears, and extend the service life of the components. A middle bearing is installed at the center of the middle support disk. First top positioning holes, second top positioning holes, and third top positioning holes are equidistantly circumferentially provided inside the top support disk. An installation hole is provided at the middle position of the top support disk. A top disk opening is provided at the installation hole. A protruding part is provided at the top disk opening. First upper positioning holes, second upper positioning holes, and third upper positioning holes are equidistantly circumferentially provided inside the upper support disk. An upper disk opening is provided at the middle position of the upper support disk. First middle positioning holes, second middle positioning holes, and third middle positioning holes are equidistantly circumferentially provided inside the middle support disk. A middle disk opening is provided at the middle position of the middle support disk. First bottom positioning holes, second bottom positioning holes, and third bottom positioning holes are equidistantly circumferentially provided inside the bottom support disk. A bottom disk opening is provided at the middle position of the bottom support disk. A worm gear is provided inside the plastic housing. A second boss is provided at the middle position of the bottom of the worm gear. A middle bearing is installed at the second boss. An internal tooth type is provided at the middle position of the top of the worm gear. A first-stage sun gear is installed at the internal tooth type. Three second-stage planetary gears are installed around the first-stage sun gear. All three second-stage planetary gears are meshed with the first-stage sun gear and the internal teeth. Central holes are equally provided inside the three second-stage planetary gears. Short shafts are fixedly installed at the first bottom positioning hole, the second bottom positioning hole, and the third bottom positioning hole of the bottom support disk. The top ends of the three short shafts respectively penetrate through the three central holes and are connected to the first middle positioning hole, the second middle positioning hole, and the third middle positioning hole. A sun gear shaft is installed at the middle disk opening of the middle support disk. The sun gear shaft has a lower part. A third-stage planetary gear is meshed and installed at the lower part. There are three third-stage planetary gears. Shaft holes are provided inside all three third-stage planetary gears. Long shafts are installed inside all three shaft holes. The three planetary gears are respectively installed around the lower part of the sun gear shaft at equal intervals circumferentially through the three long shafts. And the three long shafts are respectively fixed at the first upper positioning hole, the second upper positioning hole, and the third upper positioning hole of the upper support disk.The upper ends of the three long shafts are respectively installed at the first top positioning hole, the second top positioning hole, and the third top positioning hole of the top support disk, connecting the three-stage planetary gear with the upper support disk and the top support disk.

[0006] A further setting of the present invention is that: the side of the plastic housing is provided with a first side threaded hole, a second side threaded hole, and a middle hole, and the middle hole is located between the first side threaded hole and the second side threaded hole.

[0007] By adopting the above technical solution, through the first side threaded hole and the second side threaded hole, bolts and other connecting pieces can be used to firmly fix the motor on the plastic housing, preventing loosening or displacement during the operation of the motor, and ensuring that the motor can stably provide power for the gearbox. Through the middle hole, the motor output shaft can be connected to ensure that the power output by the motor can be accurately transmitted to the transmission components inside the gearbox.

[0008] A further setting of the present invention is that: the edge of the metal housing is circumferentially provided with a first positioning hole, a second positioning hole, a third positioning hole, and a fourth positioning hole at equal intervals. The edge of the internal gear is provided with a first hole position, a second hole position, a third hole position, and a fourth hole position at equal intervals. The middle position of the plastic housing is provided with a housing mounting hole, and the edge of the plastic housing is provided with a first threaded hole, a second threaded hole, a third threaded hole, and a fourth threaded hole at equal intervals.

[0009] By adopting the above technical solution, it can be used for screw connection to accurately install and position it with the internal gear and the plastic housing, enabling the three to be closely combined to jointly form a sealed and stable whole.

[0010] A further setting of the present invention is that: a pin hole is provided on one side of the third positioning hole, a positioning groove is provided on one side of the third hole position, and a positioning pin is installed at the pin hole, and the positioning pin passes through the positioning groove.

[0011] By adopting the above technical solution, the positioning pin is used to cooperate with the internal gear to ensure that the metal housing and the internal gear remain in one direction and are on the same center of the circle, preventing deviation.

[0012] A further setting of the present invention is that: a worm is meshed and installed on one side of the worm wheel, and a copper sleeve is provided at one end of the worm.

[0013] By adopting the above technical solution, the copper sleeve and the worm are inserted together on the motor output shaft. The copper sleeve has good self-lubricating performance, which can reduce the friction and wear between the worm and the motor output shaft, improve the transmission efficiency, and extend the service life of the components.

[0014] A further setting of the present invention is that a bearing installation position and a snap ring installation position are provided above the sun gear shaft. A small bearing is installed at the bearing installation position, and a small snap ring is installed at the snap ring installation position. A large bearing is wrapped around the first boss. The sun gear shaft is connected to the metal housing through the large bearing, and a large snap ring is installed at the bottom of the large bearing.

[0015] By adopting the above technical solution, it plays a role in preventing the axial displacement of the bearing.

[0016] A further setting of the present invention is that a first installation through hole is provided inside the worm, and a second installation through hole is provided inside the copper sleeve.

[0017] By adopting the above technical solution, the copper sleeve and the worm are inserted together on the motor output shaft. The copper sleeve has good self-lubricating performance, which can reduce the friction and wear between the worm and the motor output shaft, improve the transmission efficiency, and extend the service life of the components.

[0018] A further setting of the present invention is that the first threaded hole, the second threaded hole, the third threaded hole, and the fourth threaded hole are respectively located directly below the first hole position, the second hole position, the third hole position, and the fourth hole position. The first hole position, the second hole position, the third hole position, and the fourth hole position are respectively located directly below the first positioning hole, the second positioning hole, the third positioning hole, and the fourth positioning hole.

[0019] By adopting the above technical solution, it can be used for screw connection, enabling precise installation and positioning with the internal teeth and the plastic housing, so that the three can be closely combined to jointly form a sealed and stable whole.

[0020] The beneficial effects of the present invention are:

[0021] 1. Achieve multi-stage speed change and precise speed regulation: This three-stage transmission adjustment system utilizes the combination of worm and worm gear transmission and multi-stage planetary gear transmission to achieve the function of multi-stage speed change. From the large transmission ratio reduction of the worm and worm gear in the first-stage transmission to the further adjustment of the planetary gears with different tooth ratios in the second-stage and third-stage transmissions, various combinations of rotational speeds and torques can be precisely output according to the requirements of different working scenarios. Compared with traditional single transmission systems, it can better adapt to various complex working conditions, significantly improving the working flexibility and adaptability of the equipment.

[0022] 2. Efficient torque amplification: During the power transmission process, the system effectively increases the torque output. The first-stage worm and worm gear transmission itself can greatly increase the torque, and the subsequent planetary gear transmission further optimizes the torque distribution. This enables the limited torque output by the motor to provide sufficient powerful driving force for external equipment after system adjustment, ensuring the stable operation of the equipment under high load conditions and reducing equipment failures and inefficiencies caused by insufficient torque.

[0023] 3. High transmission efficiency: By reasonably designing the parameters and layout of each stage of transmission components, the power transmission path is optimized, reducing energy loss during transmission. For example, the characteristic of multi-tooth meshing simultaneously in planetary gear transmission evenly distributes the load, reduces the force on a single gear, and decreases frictional losses. At the same time, the cooperation of each support disk and bearing ensures the stable operation of the transmission components, further improving the transmission efficiency and saving more energy compared with traditional gearboxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 is the structural schematic diagram of the whole of the present invention.

[0026] Figure 2 is the exploded view of the present invention.

[0027] Figure 3 is the structural schematic diagram of the plastic shell in the present invention.

[0028] Figure 4 is the front view of the metal housing part in the present invention.

[0029] Figure 5 is the rear view of the metal housing part in the present invention.

[0030] Figure 6 is the structural schematic diagram of the worm in the present invention.

[0031] Figure 7 is the structural schematic diagram of the copper bushing in the present invention.

[0032] Figure 8 is the structural schematic of the worm gear in the present invention Figure One .

[0033] Figure 9 is the structural schematic of the worm gear in the present invention Figure Two .

[0034] Figure 10 is the structural schematic diagram of the bottom support disk in the present invention.

[0035] Figure 11 is the front view of the middle support disk in the present invention.

[0036] Figure 12 is the structural schematic diagram of the upper support disk in the present invention.

[0037] Figure 13 It is a schematic diagram of the structure of the top support disk in the present invention Figure One .

[0038] Figure 14 It is a schematic diagram of the structure of the top support disk in the present invention Figure Two .

[0039] Figure 15 It is a schematic diagram of the structure of the first-stage sun gear in the present invention.

[0040] Figure 16 It is a schematic diagram of the structure of the second-stage planetary gear in the present invention.

[0041] Figure 17 It is a schematic diagram of the structure of the third-stage planetary gear in the present invention.

[0042] Figure 18 It is a schematic diagram of the structure of the sun gear shaft in the present invention.

[0043] Figure 19 It is a schematic diagram of the structure of the internal gear in the present invention.

[0044] Figure 20 It is a schematic diagram of the structure of the first-stage transmission in the present invention.

[0045] Figure 21 It is a schematic diagram of the structure of the second-stage transmission in the present invention.

[0046] Figure 22 It is a schematic diagram of the structure of the third-stage transmission system in the present invention

[0047] Figure 23 It is a schematic diagram of the structure of the internal gear installation in the present invention

[0048] Figure 24 It is a schematic diagram of the structure of the second-stage planetary gear installation in the present invention.

[0049] In the figure, 100 is a metal housing; 200 is a large bearing; 300 is a top support plate; 400 is an internal gear; 500 is a three-stage planetary gear; 600 is a sun gear shaft; 700 is a positioning pin; 800 is a copper sleeve; 900 is a short shaft; 1000 is a middle bearing; 1100 is a bottom support plate; 1200 is a worm gear; 1300 is a plastic housing; 1400 is a large snap ring; 1500 is a long shaft; 1600 is a small bearing; 1700 is an upper support plate; 1800 is a small snap ring; 1900 is a worm; 2000 is a first-stage sun gear; 2100 is a second-stage planetary gear; 2200 is a middle support plate; 101 is a first positioning hole; 102 is a second positioning hole; 103 is a third positioning hole; 104 is a fourth positioning hole; 105 is a first boss; 106 is a pin hole; 301 is a first top positioning hole; 302 is a second top positioning hole; 303 is a third top positioning hole; 304 is a mounting hole; 305 is a top plate opening; 306 is a protruding part; 401 is a first hole position; 402 is a second hole position; 403 is a third hole position; 404 is a fourth hole position; 405 is a tooth; 406 is a positioning groove; 501 is a shaft hole; 601 is a lower part; 602 is a bearing mounting position; 603 is a snap ring mounting position; 801 is a second mounting through hole; 1110 is a first bottom positioning hole; 1120 is a second bottom positioning hole; 1230 is a third bottom positioning hole; 1140 is a bottom plate opening; 1210 is an internal tooth type; 1220 is a second boss; 1310 is a first threaded hole; 1320 is a second threaded hole; 1330 is a third threaded hole; 1340 is a fourth threaded hole; 1350 is a first side threaded hole; 1360 is a second side threaded hole; 1370 is a middle hole; 1380 is a housing mounting hole; 1710 is a first upper positioning hole; 1720 is a second upper positioning hole; 1730 is a third upper positioning hole; 1740 is an upper plate opening; 1910 is a first mounting through hole; 2110 is a center hole; 2210 is a first middle positioning hole; 2220 is a second middle positioning hole; 2230 is a third middle positioning hole; 2240 is a middle plate opening. Specific embodiments

[0050] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0051] For the convenience of those skilled in the art to understand, the following will be combined with the attached Figures 1 - 24 , and the technical solutions of the present invention will be further specifically described.

[0052] Embodiment 1

[0053] A technical solution for a compact and efficient three-stage gearbox mechanism, including a metal housing 100, a top support disk 300, internal teeth 400, and a plastic housing 1300. The top support disk 300 is installed inside the metal housing 100, the internal teeth 400 are installed at the bottom of the metal housing 100, the plastic housing 1300 is installed at the bottom of the internal teeth 400. Tooth teeth 405 are provided inside the internal teeth 400. A first boss 105 is provided in the middle part of the metal housing 100. An upper support disk 1700 is provided below the internal teeth 400. A middle support disk 2200 is provided below the upper support disk 1700, and a bottom support disk 1100 is provided below the middle support disk 2200. The upper support disk 1700, the middle support disk 2200, and the bottom support disk 1100 are all installed inside the plastic housing 1300. A middle bearing 1000 is installed at the center of the middle support disk 2200. First top positioning holes 301, second top positioning holes 302, and third top positioning holes 303 are equidistantly and circumferentially provided inside the top support disk 300. An installation hole 304 is provided at the middle position of the top support disk 300. A top disk opening 305 is provided at the installation hole 304, and a protruding part 306 is provided at the top disk opening 305. First upper positioning holes 1710, second upper positioning holes 1720, and third upper positioning holes 1730 are equidistantly and circumferentially provided inside the upper support disk 1700. An upper disk opening 1740 is provided at the middle position of the upper support disk 1700. First middle positioning holes 2210, second middle positioning holes 2220, and third middle positioning holes 2230 are equidistantly and circumferentially provided inside the middle support disk 2000. A middle disk opening 2240 is provided at the middle position of the middle support disk 2000. First bottom positioning holes 1110, second bottom positioning holes 1120, and third bottom positioning holes 1130 are equidistantly and circumferentially provided inside the bottom support disk 1100. A bottom disk opening 1140 is provided at the middle position of the bottom support disk 1100. A worm gear 1200 is provided inside the plastic housing 1300. A second boss 1220 is provided at the middle position of the bottom of the worm gear 1200, and a middle bearing 1000 is installed at the second boss 1220. An internal tooth type 1210 is provided at the middle position of the top of the worm gear 1200, and a first-stage sun gear 2000 is installed at the internal tooth type 1210. Three second-stage planetary gears 2100 are installed around the first-stage sun gear 2000. The three second-stage planetary gears 2100 are all meshed with the first-stage sun gear 2000 and the internal teeth 400. Central holes 2110 are equally provided inside the three second-stage planetary gears 2100. Short shafts 900 are fixedly installed at the first bottom positioning holes 1110, second bottom positioning holes 1120, and third bottom positioning holes 1130 of the bottom support disk 1100. The tops of the three short shafts 900 respectively penetrate through the three central holes 2110 and are connected to the first middle positioning hole 2210, the second middle positioning hole 2220, and the third middle positioning hole 2230. A sun gear shaft 600 is installed at the middle disk opening 2240 of the middle support disk 2200.The sun gear shaft is provided with a lower part 601, and three-stage planetary gears 500 are meshingly installed at the lower part 601. There are three three-stage planetary gears 500, and shaft holes 501 are respectively formed inside the three three-stage planetary gears 500. Long shafts 1500 are respectively installed inside the three shaft holes 501. The three planetary gears 500 are respectively circumferentially meshingly installed around the lower part 601 of the sun gear shaft 600 through the three long shafts 1500 at equal intervals, and the three long shafts 1500 are respectively fixed at the first upper positioning hole 1710, the second upper positioning hole 1720 and the third upper positioning hole 1730 of the upper support disk 1700. The upper ends of the three long shafts 1500 are respectively installed at the first top positioning hole 301, the second top positioning hole 302 and the third top positioning hole 303 of the top support disk 300, connecting the three-stage planetary gears 500 with the upper support disk 1700 and the top support disk 300.,

[0054] Embodiment 2

[0055] The difference between this embodiment and the first embodiment is as follows: on the side of the plastic housing 1300, a first side threaded hole 1350, a second side threaded hole 1360 and a middle hole 1370 are provided. The middle hole 1370 is located between the first side threaded hole 1350 and the second side threaded hole 1360. Through the first side threaded hole 1350 and the second side threaded hole 1360, connectors such as bolts can be used to firmly fix the motor on the plastic housing 1300, preventing loosening or displacement during the operation of the motor, and ensuring that the motor can stably provide power for the gearbox. Through the middle hole 1370, the motor output shaft can be connected to ensure that the power output by the motor can be accurately transmitted to the transmission components inside the gearbox. At the edge of the metal housing 100, first positioning holes 101, second positioning holes 102, third positioning holes 103 and fourth positioning holes 104 are equally spaced in a circumferential manner. At the edge of the internal gear 400, first hole positions 401, second hole positions 402, third hole positions 403 and fourth hole positions 404 are equally spaced. At the middle position of the plastic housing 1300, a housing mounting hole 1380 is provided. At the edge of the plastic housing 1300, first threaded holes 1310, second threaded holes 1320, third threaded holes 1330 and fourth threaded holes 1340 are equally spaced. The first threaded hole 1310, the second threaded hole 1320, the third threaded hole 1330 and the fourth threaded hole 1340 are respectively directly below the first hole position 401, the second hole position 402, the third hole position 403 and the fourth hole position 404. The first hole position 401, the second hole position 402, the third hole position 403 and the fourth hole position 404 are respectively directly below the first positioning hole 101, the second positioning hole 102, the third positioning hole 103 and the fourth positioning hole 104, and can be used for screw connection to accurately install and position it with the internal gear 400 and the plastic housing 1300, so that the three can be closely combined to jointly form a sealed and stable whole. On one side of the third positioning hole 103, a dowel pin hole 106 is provided. On one side of the third hole position 403, a positioning groove 406 is provided. A dowel pin 700 is installed at the dowel pin hole 106, and the dowel pin 700 passes through the positioning groove 406.The positioning pin 700 is used to cooperate with the internal teeth 400 to ensure that the metal housing 100 and the internal teeth 400 are kept in one direction and on the same center of the circle, preventing deviation. One side of the worm gear 1200 is meshed with a worm 1900. One end of the worm 1900 is provided with a copper sleeve 800. The copper sleeve 800 and the worm 1200 are inserted through the motor output shaft together. The copper sleeve has good self-lubricating performance, which can reduce the friction and wear between the worm 1200 and the motor output shaft, improve the transmission efficiency, and extend the service life of the components. Above the sun gear shaft 600, there are a bearing installation position 602 and a snap ring installation position 603. A small bearing 1600 is installed at the bearing installation position 602, and a small snap ring 1800 is installed at the snap ring installation position 603. A large bearing 200 is wrapped around the first boss 105. The sun gear shaft 600 is connected to the metal housing 100 through the large bearing 200, and a large snap ring 1400 is installed at the bottom of the large bearing 200 to prevent the axial displacement of the bearing. A first installation through hole 1910 is opened inside the worm 1900, and a second installation through hole 801 is opened inside the copper sleeve 800. The copper sleeve 800 and the worm 1900 are inserted through the motor output shaft together. The copper sleeve 800 has good self-lubricating performance, which can reduce the friction and wear between the worm 1900 and the motor output shaft, improve the transmission efficiency, and extend the service life of the components.,

[0056] Working principle: First, install the worm 1900 and the copper sleeve 800 on the motor output shaft, then install the worm gear 1200 in the plastic housing 1300, with its boss connected to the middle bearing 1000. The first-stage sun gear 2000 is installed into the internal teeth 400 type of the worm gear 1200. Then, distribute the second-stage planetary gears 2100 around the first-stage sun gear 2000. The short shaft 900 passes through and is connected to the middle and bottom support plates 1100. The sun gear shaft 600 is installed on the middle support plate 2200, and the third-stage planetary gears 500 are distributed around it. The long shaft 1500 passes through and is connected to the top and the upper support plate 1700. After that, install the large, medium, and small bearings 1600. The positioning pin 700 is installed to cooperate with the internal teeth 400 and the metal housing 100. The large snap ring 1400 and the small snap ring 1800 are respectively installed above the large bearing 200 and the small bearing 1600. Finally, install the metal housing 100;

[0057] When the motor starts, the output shaft drives the worm 1900, and the worm 1900 drives the worm gear 1200. The first-stage transmission realizes speed reduction and torque increase. The worm gear 1200 drives the first-stage sun gear 2000, causing the second-stage planetary gears 2100 to rotate and revolve. The speed and torque are adjusted through the tooth ratio. The middle support plate 2200 drives the sun gear shaft 600 to drive the third-stage planetary gears 500. The internal teeth 400 ensure stable transmission. Finally, the power is output to external equipment through the protruding part of the upper support plate 1700;

[0058] Finally, regularly conduct a comprehensive inspection of the component connections, lubrication, and wear conditions to ensure that the positioning pins 700 and circlips are normal. Lubricate and maintain the rotating components as required, and promptly repair or replace the damaged components.

[0059] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. The standard parts used in this application document can all be purchased from the market, and can be customized according to the description of the specification and the drawings. The specific connection methods of each part all adopt the mature conventional means in the prior art. The machines, parts and devices all adopt the conventional models in the prior art, and the circuit connections adopt the conventional connection methods in the prior art. No specific description will be made here.

[0060] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compact and efficient three-stage gearbox mechanism, comprising a metal housing (100), a top support plate (300), internal teeth (400) and a plastic housing (1300), characterized in that: The top support plate (300) is installed inside the metal shell (100), the inner teeth (400) are installed at the bottom of the metal shell (100), the plastic shell (1300) is installed at the bottom of the inner teeth (400), the inner side of the inner teeth (400) is provided with teeth (405), the middle part of the metal shell (100) is provided with a first boss (105), an upper support plate (1700) is provided below the inner teeth (400), a middle support plate (2200) is provided below the upper support plate (1700), a bottom support plate (1100) is provided below the middle support plate (2200), the upper support plate (1700) and the middle support plate (2200) are provided at the bottom of the plastic shell (1300), and the upper support plate (1700) and the middle support plate (2200) are provided at the bottom of the plastic shell (1300). and the bottom support plate (1100) are installed inside the plastic shell (1300), a middle bearing (1000) is installed at the center of the middle support plate (2200), a first top positioning hole (301), a second top positioning hole (302) and a third top positioning hole (303) are opened at equal intervals on the inner circumference of the top support plate (300), a mounting hole (304) is opened at the middle position of the top support plate (300), a top plate opening (305) is provided at the mounting hole (304), and a protruding portion (306) is provided at the top plate opening (305), and a first upper positioning hole (1710), a second upper positioning hole (1711) and a third upper positioning hole (1712) are opened at equal intervals on the inner circumference of the upper support plate (1700). 20) and a third upper positioning hole (1730), an upper disk opening (1740) is provided at the middle position of the upper support plate (1700), a first middle positioning hole (2210), a second middle positioning hole (2220) and a third middle positioning hole (2230) are provided at an evenly spaced circumference inside the middle support plate (2000), a middle disk opening (2240) is provided at the middle position of the middle support plate (2000), a first bottom positioning hole (1110), a second bottom positioning hole (1120) and a third bottom positioning hole (1130) are provided at an evenly spaced circumference inside the bottom support plate (1100), a bottom disk opening (1140) is provided at the middle position of the bottom support plate (1100), A worm gear (1200) is arranged inside the plastic shell (1300), a second boss (1220) is arranged at the middle position of the bottom of the worm gear (1200), a middle bearing (1000) is installed at the second boss (1220), an inner gear (1210) is arranged at the middle position of the top of the worm gear (1200), a primary sun gear (2000) is installed at the internal gear (1210), three secondary planetary gears (2100) are arranged around the primary sun gear (2000), the three secondary planetary gears (2100) are meshed with the primary sun gear (2000) and the internal gear (400), and a center hole (2110) is opened inside the three secondary planetary gears (2100),The first bottom positioning hole (1110), the second bottom positioning hole (1120) and the third bottom positioning hole (1130) of the bottom support plate (1100) are all fixedly mounted with short shafts (900), the top ends of the three short shafts (900) respectively penetrate the three center holes (2110) and are connected with the first middle positioning hole (2210), the second middle positioning hole (2220) and the third middle positioning hole (2230), the middle plate opening (2240) of the middle support plate (2200) is mounted with a sun gear shaft (600), the sun gear shaft is provided with a lower portion (601), and a three-stage planetary gear (500) is meshedly mounted on the lower portion (601), the three-stage planetary gear (500) has three, and the insides of the three three-stage planetary gears (500) are all provided with shaft holes (501) , the interior of each of the three shaft holes (501) is equipped with a long shaft (1500), and the three planetary gears (500) are respectively installed around the lower part (601) of the sun gear shaft (600) through the three long shafts (1500) in equidistant circumferential meshing, and the three long shafts (1500) are respectively fixed at the first upper positioning hole (1710), the second upper positioning hole (1720) and the third upper positioning hole (1730) of the upper support plate (1700), and the upper ends of the three long shafts (1500) are respectively installed at the first top positioning hole (301), the second top positioning hole (302) and the third top positioning hole (303) of the top support plate (300), so as to connect the three-stage planetary gear (500) with the upper support plate (1700) and the top support plate (300). , 2. A compact and efficient three-stage gearbox mechanism according to claim 1, characterized in that: The side of the plastic shell (1300) is provided with a first side threaded hole (1350), a second side threaded hole (1360) and a middle hole (1370), and the middle hole (1370) is located between the first side threaded hole (1350) and the second side threaded hole (1360).

3. A compact and efficient three-stage gearbox mechanism according to claim 1, characterized in that: The edge of the metal shell (100) is provided with a first positioning hole (101), a second positioning hole (102), a third positioning hole (103) and a fourth positioning hole (104) at equal intervals, the edge of the inner tooth (400) is provided with a first hole position (401), a second hole position (402), a third hole position (403) and a fourth hole position (404) at equal intervals, a shell mounting hole (1380) is provided at the middle position of the plastic shell (1300), and the edge of the plastic shell (1300) is provided with a first threaded hole (1310), a second threaded hole (1320), a third threaded hole (1330) and a fourth threaded hole (1340) at equal intervals.

4. A compact and efficient three-stage gearbox mechanism according to claim 3, characterized in that: A pin hole (106) is provided on one side of the third positioning hole (103), a positioning groove (406) is provided on one side of the third hole position (403), a positioning pin (700) is installed at the pin hole (106), and the positioning pin (700) passes through the positioning groove (406).

5. A compact and efficient three-stage gearbox mechanism according to claim 1, characterized in that: A worm (1900) is meshedly mounted on one side of the worm wheel (1200), and a copper sleeve (800) is disposed on one end of the worm (1900).

6. A compact and efficient three-stage gearbox mechanism according to claim 1, characterized in that: A bearing mounting position (602) and a retaining spring mounting position (603) are provided above the sun gear shaft (600); a small bearing (1600) is installed at the bearing mounting position (602); a small retaining spring (1800) is installed at the retaining spring mounting position (603); a large bearing (200) is wrapped around the first boss (105); the sun gear shaft (600) is connected to the metal shell (100) via the large bearing (200), and a large retaining spring (1400) is installed at the bottom of the large bearing (200).

7. A compact and efficient three-stage gearbox mechanism according to claim 5, characterized in that: A first mounting through hole (1910) is provided inside the worm (1900), and a second mounting through hole (801) is provided inside the copper sleeve (800).

8. A compact and efficient three-stage gearbox mechanism according to claim 3, characterized in that: The first threaded hole (1310), the second threaded hole (1320), the third threaded hole (1330) and the fourth threaded hole (1340) are respectively located directly below the first hole position (401), the second hole position (402), the third hole position (403) and the fourth hole position (404); the first hole position (401), the second hole position (402), the third hole position (403) and the fourth hole position (404) are respectively located directly below the first positioning hole (101), the second positioning hole (102), the third positioning hole (103) and the fourth positioning hole (104).

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