A multi-stage reduction gear

Abstract

The utility model discloses a multistage speed reduction transmission device, including drive motor, speed reduction mechanism, transmission mechanism and output mechanism. The output shaft of drive motor is provided with drive worm; Speed reduction mechanism includes with drive worm meshing bevel gear and with bevel gear transmission connection multistage speed reduction gear; Output mechanism includes output worm wheel and with its meshing output worm, and the one end of output worm is through transmission mechanism with multistage speed reduction gear transmission connection, and output worm wheel is used for output load. Through adopting worm and bevel gear meshing transmission, multistage gear speed reduction and the mixed transmission mode of worm worm wheel output, make full use of worm drive's big reduction ratio characteristic, the stability of bevel gear transmission and worm worm's self locking function, realize big reduction ratio and high carrying capacity in compact structure space, effectively solved the technical problem that traditional speed reduction device is difficult to meet big transmission ratio and heavy load carrying requirement simultaneously in space limited occasion.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, and in particular to a multi-stage speed reduction transmission device. Background Technology

[0002] Currently, most speed reduction transmission devices on the market adopt spur gear transmission structures or planetary reduction structures. These have significant limitations when facing low-speed, heavy-load applications. Spur gear transmission structures require large-diameter gears for multi-stage meshing to achieve a sufficient reduction ratio, while planetary reduction structures require even more reduction stages to reach the required transmission ratio. Both approaches result in the entire speed reduction device occupying excessive installation space, making it difficult to meet the installation requirements of compact equipment. Furthermore, traditional speed reduction devices often achieve high reduction ratios by increasing the number of gear stages or the gear module, which not only increases the overall size and weight but also reduces transmission efficiency and increases manufacturing costs. In applications such as industrial robotic arms, precision machining equipment, and automated assembly lines, where compact installation space and high load-bearing capacity are required, traditional spur gear transmission structures and planetary reduction structures struggle to simultaneously meet the comprehensive technical requirements of high transmission ratio, compact structure, and high load-bearing capacity. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a compact multi-stage reduction transmission device with a large reduction ratio.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A multi-stage reduction transmission device includes: a drive motor, a reduction mechanism, a transmission mechanism, and an output mechanism; the output shaft of the drive motor is provided with a drive worm; the reduction mechanism includes a helical gear meshing with the drive worm, and a multi-stage reduction gear drivingly connected to the helical gear; the output mechanism includes an output worm wheel and an output worm meshing with it, one end of the output worm being drivingly connected to the multi-stage reduction gear through the transmission mechanism, and the output worm wheel being used to output load.

[0006] Furthermore, the deceleration mechanism is disposed within the first housing; the output mechanism is disposed within the second housing; a fixing frame is disposed on the second housing; the drive motor is connected to the first housing, and the drive worm extends into the first housing and meshes with the helical gear; the first housing is connected to the second housing via the fixing frame, and a buffer pad is disposed between the first housing and the fixing frame.

[0007] Furthermore, a third housing is provided on the second housing, and the transmission mechanism is located inside the third housing; a coupling is provided between the first housing and the third housing; the output shaft of the multi-stage reduction gear is connected to the input end of the transmission mechanism through the coupling.

[0008] Furthermore, the helical gear is a double gear, including a helical tooth portion that meshes with the driving worm and a spur tooth portion with a smaller tooth diameter; the multi-stage reduction gear includes multiple double gears arranged in series and an output gear at the end, each double gear including a large gear portion and a small gear portion; the output gear is connected to the transmission mechanism via a coupling.

[0009] Furthermore, the transmission mechanism includes a transmission shaft and at least one transmission gear disposed within the third housing; one end of the transmission shaft is connected to the reduction mechanism via a coupling, and the other end meshes with the transmission gear; the transmission shaft is driven by meshing with the output gear at the end of the output worm gear through the transmission gear.

[0010] Furthermore, the coupling is provided with a shock-absorbing pad, which is made of TPU material.

[0011] Furthermore, a bearing seat is provided inside the second housing, and the two ends of the output worm are respectively supported on the bearing seat by rolling bearings; a direct thrust bearing is provided on the axial outside of the rolling bearing, the outer ring of the direct thrust bearing is fixedly connected to the second housing, and the inner ring cooperates with the output worm to bear the axial thrust of the output worm.

[0012] Furthermore, the first housing includes an upper shell, a middle shell, and a lower shell; the fixing frame includes an upper frame and a lower frame; silicone pads are provided on the upper and lower sides of the upper frame and the lower frame; the upper shell is connected to the upper frame by passing through the silicone pads with screws, and the lower shell is connected to the lower frame by passing through the silicone pads with screws.

[0013] Furthermore, the motor is a brushless coreless motor.

[0014] Furthermore, the helical gear is made of PEEK material.

[0015] The beneficial effects of this utility model are:

[0016] This utility model discloses a multi-stage reduction transmission device, comprising a drive motor, a reduction mechanism, a transmission mechanism, and an output mechanism. The output shaft of the drive motor is equipped with a drive worm; the reduction mechanism includes a helical gear meshing with the drive worm, and a multi-stage reduction gear connected to the helical gear; the output mechanism includes an output worm wheel and an output worm meshing with it, one end of which is connected to the multi-stage reduction gear via the transmission mechanism, and the output worm wheel is used to output the load. By employing worm and helical gear meshing transmission, multi-stage gear reduction, and worm and worm wheel output transmission, the large reduction ratio characteristic of worm transmission, the smoothness of helical gear transmission, and the self-locking function of the worm wheel and worm gear are fully utilized. This achieves a large reduction ratio and high load-bearing capacity within a compact structural space, effectively solving the technical problem that traditional reduction devices struggle to simultaneously meet the requirements of large transmission ratio and heavy load-bearing capacity in space-constrained applications. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0020] Figure 3 This is an exploded view of part of the structure of this utility model.

[0021] in,

[0022] 100. Drive motor; 110. Drive worm gear;

[0023] 200, First housing; 210, Upper housing; 220, Middle housing; 230, Lower housing; 240, Reduction mechanism; 241, Helical gear; 242, Reduction gear; 243, Output gear;

[0024] 300. Second housing; 310. Output mechanism; 311. Output worm gear; 312. Output worm; 313. Bearing housing; 314. Direct thrust bearing;

[0025] 400. Third housing; 410. Transmission mechanism; 411. Transmission shaft; 412. Transmission gear;

[0026] 500. Fixed rack; 510. Upholstered; 520. Downholstered;

[0027] 600, cushioning pad;

[0028] 700. Coupling. Detailed Implementation

[0029] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0030] Reference Figure 1-3 A multi-stage reduction transmission device includes: a drive motor 100, a reduction mechanism 240, a transmission mechanism 410, and an output mechanism 310; the output shaft of the drive motor 100 is provided with a drive worm 110; the reduction mechanism 240 includes a helical gear 241 meshing with the drive worm 110, and a multi-stage reduction gear 242 drivingly connected to the helical gear 241; the output mechanism 310 includes an output worm wheel 311 and an output worm 312 meshing with it, one end of the output worm 312 being drivingly connected to the multi-stage reduction gear 242 through the transmission mechanism 410, and the output worm wheel 311 being used to output load. Understandably, after the drive motor 100 starts, its output shaft drives the drive worm 110 mounted on it to start rotating. Then, the drive worm 110 meshes with the helical gear 241 in the reduction mechanism 240, achieving the first stage of reduction through the meshing of the worm and the helical gear 241. Next, the helical gear 241 transmits power to the multi-stage reduction gear 242 connected to it. The multi-stage reduction gear 242 achieves further reduction and torque increase through the cascading meshing of multiple gears. Subsequently, the output end of the multi-stage reduction gear 242 establishes a transmission connection with one end of the output worm 312 through the transmission mechanism 410. The transmission mechanism 410 transmits the reduced power to the output worm 312. Finally, the output worm 312 meshes with the output worm wheel 311, and the output worm wheel 311 outputs the high torque power after multi-stage reduction to the load equipment. Initial deceleration is achieved through the worm gear transmission of the drive worm 110 and helical gear 241, followed by multi-stage deceleration through the gear transmission of the multi-stage reduction gear 242, and then transmitted to the output worm 312 via the transmission mechanism 410. Finally, high torque power is output through the worm gear transmission of the output worm 312 and the output worm wheel 311.

[0031] This design achieves high-ratio speed reduction while maintaining smooth transmission by combining a drive worm gear 110 with a helical gear 241 at the first end. This is because the worm gear drive possesses self-locking properties and a high reduction ratio, while the helical gear 241 offers better meshing continuity and lower noise and vibration compared to spur gears, resulting in high-efficiency and low-noise transmission in the initial reduction stage. Next, a multi-stage reduction gear 242 further enhances the overall reduction ratio while maintaining a compact design, meeting the demands for high precision and high torque output. Finally, the combination of an output worm gear 312 and an output worm wheel 311 at the output end not only further increases the output torque but also provides excellent self-locking characteristics, preventing reverse drive of the device and improving system safety and stability. The overall transmission chain, through the combination of worm and gear drives, leverages the advantages of the worm gear drive's high reduction ratio and self-locking properties while utilizing the high efficiency and strong load-bearing capacity of gear drives. This allows the device to achieve a high reduction ratio while maintaining high transmission efficiency, with a compact structure and reliable operation, making it particularly suitable for industrial equipment requiring high torque output and precise control.

[0032] It should be noted that the combined transmission efficiency of the worm and helical gear 241 is relatively high because the helical gear 241, as the driven component, has good tooth surface contact and relatively low sliding friction. In contrast, the combined transmission efficiency of the worm and worm wheel is relatively low due to the significant sliding friction and axial force inherent in worm-worm wheel transmissions. Therefore, the first end uses a combination of driving worm 110 and helical gear 241. In this case, the input power is relatively small, and even with slightly lower worm transmission efficiency, there will be no significant power loss. Simultaneously, the worm transmission can provide a large primary reduction ratio, reducing the burden on the subsequent multi-stage reduction gear 242. Finally, the output end uses a combination of output worm 312 and output worm wheel 311. This is mainly because the worm wheel, as the final output component, has good self-locking characteristics and high torque carrying capacity. Although the transmission power is relatively high at this point, the output worm wheel 311 rotates at a very low speed, reducing the relative speed difference and making the absolute value of friction loss relatively controllable. However, if the configuration is reversed, i.e., the first end uses a worm gear and worm, and the last end uses a helical gear 241 and worm, it is technically feasible, but it will bring obvious disadvantages: the worm gear at the first end needs to withstand high speed input, which will lead to significant efficiency loss and heat generation problems, while the helical gear 241 at the last output end lacks self-locking characteristics and cannot prevent the load from driving in reverse. At the same time, the high torque carrying capacity of the helical gear 241 is not as good as that of the worm gear. Therefore, the existing solution achieves the best balance between transmission efficiency, self-locking performance and load carrying capacity.

[0033] In some embodiments, the types of motors that can be selected include brushed DC motors, brushless DC motors, stepper motors, servo motors, etc. Among them, brushed DC motors have lower costs but have brush friction noise, stepper motors generate obvious pulse noise during operation, and traditional solid rotor motors also generate a lot of noise during start-up and stop due to their large rotor inertia. In this case, a brushless hollow cup motor is preferred because its rotor adopts a hollow cup structure, with extremely small rotational inertia, resulting in very low impact noise during start-up and braking. At the same time, the brushless design eliminates the mechanical friction between the brushes and the commutator, fundamentally avoiding the generation of brush noise.

[0034] Regarding the material of helical gear 241, metal materials such as steel, cast iron, and aluminum alloys can be selected, as well as engineering plastics such as nylon, polyoxymethylene, and polycarbonate. Although traditional steel helical gears 241 have high strength, they will produce obvious metal collision noise during meshing. Aluminum alloy gears are lightweight but still have metal contact noise. In this case, helical gears 241 made of PEEK material are preferred because PEEK has excellent self-lubricating properties and vibration reduction characteristics. When meshing with the worm gear, it can significantly reduce tooth surface friction noise. At the same time, PEEK has a moderate elastic modulus, which can absorb some of the meshing impact and further reduce transmission noise.

[0035] In some embodiments, refer to Figure 2 , 3 The reduction mechanism 240 is disposed within the first housing 200; the output mechanism 310 is disposed within the second housing 300; a fixing frame 500 is disposed on the second housing 300; the drive motor 100 is connected to the first housing 200, and the drive worm gear 110 extends into the first housing 200 and meshes with the helical gear 241; the first housing 200 is connected to the second housing 300 via the fixing frame 500, and a buffer pad 600 is disposed between the first housing 200 and the fixing frame 500. Further, a third housing 400 is disposed on the second housing 300, and the transmission mechanism 410 is located within the third housing 400; a coupling 700 is disposed between the first housing 200 and the third housing 400; the output shaft of the multi-stage reduction gear 242 is connected to the input end of the transmission mechanism 410 via the coupling 700.

[0036] Understandably, the reduction mechanism 240 is first installed and fixed inside the first housing 200 to ensure the correct positioning of the helical gear 241 and the multi-stage reduction gear 242 within the first housing 200. Then, the output mechanism 310, including the output worm 312 and the output worm wheel 311, is installed inside the second housing 300. Next, a fixing bracket 500 is installed on the second housing 300, and a buffer pad 600 is placed between the contact surfaces of the first housing 200 and the fixing bracket 500 to reduce vibration transmission. Subsequently, the drive motor 100 is connected to the first housing 200 so that the drive worm 110 on the output shaft of the drive motor 100 can extend into the first housing 200 to mesh with the helical gear 241. Finally, the first housing 200 and the second housing 300 are securely connected by the fixing bracket 500 to form an integral structure. Next, the third housing 400 is installed on the second housing 300, and the various components of the transmission mechanism 410 are installed inside the third housing 400. Then, a coupling 700 is installed between the first housing 200 and the third housing 400. Finally, the output shaft of the multi-stage reduction gear 242 is connected to the input end of the transmission mechanism 410 through the coupling 700 to form a complete transmission path.

[0037] The helical gear 241 in this case is a double-gear structure, integrating a helical gear portion and a spur gear portion with a smaller tooth diameter on the same shaft. The helical gear portion is used for meshing and transmission with the drive worm gear 110, while the spur gear portion serves as the input end for subsequent transmission. Multiple double-gears are then arranged, each containing a large gear portion and a small gear portion. These double-gears are connected in series according to the required transmission ratio, so that the large gear portion of the first double-gear meshes with the spur gear portion of the helical gear 241, the large gear portion of the second double-gear meshes with the small gear portion of the first double-gear, and so on, forming a multi-stage reduction transmission chain. Next, an output gear 243 is installed at the end of the transmission chain, meshing with the small gear portion of the last double-gear. Then, a suitable coupling 700 of appropriate specifications and type is selected to establish a reliable transmission connection between the output shaft of the output gear 243 and the input end of the transmission mechanism 410 through the coupling 700, ensuring effective torque transmission while allowing for a certain degree of axial deviation.

[0038] It should be noted that this design preferably uses the flexible coupling 700 because it can absorb vibrations and impacts during transmission through its elastic elements, while allowing for a certain degree of axial, radial, and angular misalignment, effectively reducing additional loads and noise caused by shaft misalignment. Regarding the damping pad material, elastic materials such as rubber, silicone, polyurethane, and TPU can be used. While ordinary rubber is inexpensive, it is prone to aging and hardening over long-term use, losing its damping effect. Silicone has good temperature resistance, but its relatively high elastic modulus limits its damping effect. Polyurethane has high strength, but it may become brittle at low temperatures. This design prefers TPU material for the damping pad. TPU has excellent elastic recovery and damping characteristics, effectively absorbing high-frequency vibrations and low-frequency impacts in the transmission system. Furthermore, the viscoelastic properties of TPU allow it to convert mechanical energy into heat dissipation under alternating loads, significantly reducing vibration propagation.

[0039] In some embodiments, refer to Figure 1-3 The first housing 200 includes an upper housing 210, a middle housing 220, and a lower housing 230; the fixing frame 500 includes an upper frame 510 and a lower frame 520; silicone pads are provided on the upper and lower sides of the upper frame 510 and the lower frame 520; the upper housing 210 is connected to the upper frame 510 by threaded screws passing through the silicone pads, and the lower housing 230 is connected to the lower frame 520 by threaded screws passing through the silicone pads. Silicone pads are attached or installed on the upper and lower surfaces of the upper frame 510, and silicone pads are also provided on the upper and lower surfaces of the lower frame 520 to ensure that the silicone pads are in close contact with the surface of the frame. Next, the upper shell 210 is positioned in the corresponding position on the upper frame 510, aligning the mounting holes of the upper shell 210 with the threaded holes of the upper frame 510. Then, a suitable size of push-button screw is selected, passed through the silicone pad, and screwed into the upper frame 510. The tightening force of the push-button screw securely fixes the upper shell 210 to the upper frame 510, while the silicone pad forms a buffer layer between the screw head and the shell. The same installation method is then used to connect the lower shell 230 to the lower frame 520 using push-button screws passed through the silicone pad. It is ensured that the torque of the push-button screws is evenly distributed to avoid deformation of the silicone pad or stress concentration in the shell due to improper tightening force. The multiple buffering features of the silicone pad completely prevent hard contact between the first shell 200 and the fixing frame 500. The silicone pad not only isolates the shell from direct metal contact with the frame but also forms a soft buffer layer on the push-button screw head, preventing vibration transmission from hard contact between the screw and the shell.

[0040] In some embodiments, refer to Figure 2The transmission mechanism 410 includes a transmission shaft 411 and at least one transmission gear 412 disposed within the third housing 400. One end of the transmission shaft 411 is connected to the reduction mechanism 240 via a coupling 700, and the other end meshes with the transmission gear 412. The transmission shaft 411 is driven by the transmission gear 412 meshing with the output gear 243 at the end of the output worm gear 312. It is understood that, firstly, the transmission shaft 411 is installed in a pre-set bearing seat 313 within the third housing 400 to ensure that the transmission shaft 411 can rotate smoothly within the housing and bear the transmission load. Then, one end of the transmission shaft 411 is connected to the output end of the reduction mechanism 240 via the coupling 700. During the connection process of the coupling 700, the axis is ensured to be aligned and a buffer connection is achieved using a TPU shock-absorbing pad. Next, at least one transmission gear 412 is fixedly installed at a designated position within the third housing 400, so that the transmission gear 412 meshes with the other end of the transmission shaft 411. Subsequently, the meshing parameters between the drive shaft 411 and the drive gear 412 were adjusted, including the center distance, tooth tip clearance, and backlash, to ensure smooth meshing transmission. Then, the position of the drive gear 412 was further adjusted to ensure proper meshing with the output gear 243 at the end of the output worm 312. Measurement and fine-tuning were used to ensure the meshing quality between the drive gear 412 and the output gear 243. Finally, the axial positions of all transmission components were fixed, and axial movement was prevented using structures such as shaft shoulders, retaining rings, or bearing covers. An overall test run was then conducted to verify the operation of the transmission chain.

[0041] In some embodiments, continue to refer to Figure 2 The second housing 300 is provided with a bearing seat 313, and the two ends of the output worm 312 are respectively supported on the bearing seat 313 by rolling bearings; the direct thrust bearing 314 is disposed on the outer side of the rolling bearing, the outer ring of the direct thrust bearing 314 is fixedly connected to the second housing 300, and the inner ring is engaged with the output worm 312 to bear the axial thrust of the output worm 312.

[0042] Understandably, firstly, bearing housings 313 are machined or installed at designated locations inside the second housing 300, ensuring that the inner diameter and surface roughness of the bearing housings 313 meet the installation requirements of rolling bearings. Then, both ends of the output worm 312 are inserted into the bearing housings 313, and rolling bearings are installed on the journals at both ends of the output worm 312. The rolling bearings are then securely fixed to the output worm 312 using interference fits or bearing lock nuts, allowing the output worm 312 to rotate smoothly within the bearing housings 313. Next, thrust bearings 314 are installed at the axially outer position of each rolling bearing. The outer rings of the thrust bearings 314 are fixedly connected to the second housing 300 using bolts or interference fits, ensuring that the outer rings of the thrust bearings 314 do not rotate or shift axially. Finally, the inner rings of the thrust bearings 314 are fitted with the shoulders or specially designed axial locating surfaces of the output worm 312, allowing the inner rings to rotate together with the output worm 312. Subsequently, the axial preload of the direct thrust bearing 314 is adjusted. The axial clearance of the bearing is controlled by adjusting the shim thickness or the nut tightening torque to ensure that the direct thrust bearing 314 can effectively withstand the axial thrust generated by the output worm gear 312 during transmission, while avoiding excessive frictional resistance that would affect transmission efficiency. For example, in the drive system, when the output worm gear 312 meshes with the output worm wheel 311, it generates axial thrust. The direct thrust bearings 314 at both ends of the output worm gear 312 can directly transmit these axial forces to the second housing 300, preventing the axial force from acting on the rolling bearing and causing bearing overload and premature failure. At the same time, it ensures that the output worm gear 312 can maintain a stable axial position when subjected to high torque output, thereby ensuring the positional accuracy and smooth movement of the robotic arm joint.

[0043] This design achieves excellent noise reduction through multi-layered vibration and noise reduction design. The brushless coreless motor eliminates brush friction noise and rotor inertia impact noise. The self-lubricating properties and elastic modulus of the PEEK material helical gear 241 significantly reduce tooth meshing noise. The silicone pads prevent hard contact between the first housing 200 and the fixing frame 500. The plug screws also achieve a soft connection through the silicone pads. The TPU shock-absorbing pads in the coupling 700 further absorb vibration and impact during transmission. The entire transmission system forms a complete chain of silent control from the motor to the output end.

[0044] In addition, the multi-stage reduction transmission in this case can withstand large load output. The worm gear transmission provides a high reduction ratio and high torque carrying capacity in the first and last output stages. Multiple series double gears realize step-by-step reduction and torque amplification. The combination of rolling bearings and direct thrust bearings 314 at both ends of the output worm 312 effectively distributes the radial load and axial thrust, ensuring stable transmission performance under heavy load conditions. It is particularly suitable for application scenarios that require high torque output.

[0045] In addition, this project optimizes the configuration of different types of transmission pairs at different positions in the transmission chain. The first stage uses a combination of worm and PEEK helical gear 241 to provide primary reduction when the input power is small. The intermediate stage uses multi-stage reduction gears 242 in series to maintain high transmission efficiency. The final output stage uses worm gear transmission, which has relatively low efficiency but can provide reliable self-locking characteristics and large torque output. The overall transmission efficiency is optimized and balanced through reasonable stage allocation and material selection. At the same time, TPU shock-absorbing pads and bearings reduce energy loss during the transmission process.

[0046] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A multi-stage speed reduction transmission device, characterized in that, include: Drive motor, reduction mechanism, transmission mechanism and output mechanism; The output shaft of the drive motor is equipped with a drive worm gear. The reduction mechanism includes a helical gear meshing with the drive worm, and a multi-stage reduction gear that is connected to the helical gear in a transmission. The output mechanism includes an output worm gear and an output worm meshing with it. One end of the output worm is connected to the multi-stage reduction gear through the transmission mechanism. The output worm gear is used to output the load.

2. The multi-stage reduction transmission device according to claim 1, characterized in that, The deceleration mechanism is disposed within the first housing; The output mechanism is disposed within the second housing; A fixing bracket is provided on the second housing; The drive motor is connected to the first housing, and the drive worm extends into the first housing and meshes with the helical gear. The first housing is connected to the second housing via the fixing frame, and a buffer pad is provided between the first housing and the fixing frame.

3. The multi-stage reduction transmission device according to claim 2, characterized in that, A third housing is provided on the second housing, and the transmission mechanism is located inside the third housing; A coupling is provided between the first housing and the third housing; The output shaft of the multi-stage reduction gear is connected to the input end of the transmission mechanism via the coupling.

4. The multi-stage reduction transmission device according to claim 3, characterized in that, The helical gear is a double gear, comprising a helical tooth portion that meshes with the drive worm and a spur tooth portion with a smaller tooth diameter; The multi-stage reduction gear includes multiple double gears arranged in series and an output gear at the end. Each double gear includes a large gear part and a small gear part. The output gear is connected to the transmission mechanism via a coupling.

5. The multi-stage reduction transmission device according to claim 3, characterized in that, The transmission mechanism includes a transmission shaft and at least one transmission gear disposed within the third housing; One end of the drive shaft is connected to the reduction mechanism via a coupling, and the other end meshes with a drive gear. The drive shaft is driven by the drive gear meshing with the output gear at the end of the output worm.

6. The multi-stage reduction transmission device according to claim 3, characterized in that, The coupling is equipped with a shock-absorbing pad, which is made of TPU material.

7. The multi-stage reduction transmission device according to claim 2, characterized in that, The second housing is provided with a bearing seat, and the two ends of the output worm are respectively supported on the bearing seat by rolling bearings; The direct thrust bearing is located on the axial outer side of the rolling bearing. The outer ring of the direct thrust bearing is fixedly connected to the second housing, and the inner ring is engaged with the output worm gear to withstand the axial thrust of the output worm gear.

8. The multi-stage reduction transmission device according to claim 2, characterized in that, The first housing includes an upper housing, a middle housing, and a lower housing; The fixed frame includes an upper frame and a lower frame; Silicone pads are provided on the upper and lower sides of the upper shelf and the upper and lower sides of the lower shelf; The upper shell is connected to the upper frame via a screw passing through the silicone pad, and the lower shell is connected to the lower frame via a screw passing through the silicone pad.

9. The multi-stage reduction transmission device according to claim 1, characterized in that, The motor is a brushless coreless motor.

10. The multi-stage reduction transmission device according to claim 1, characterized in that, The helical gear is made of PEEK material.

Images