Combined rotary drive mechanism with large reduction ratio and self-locking

Abstract

The utility model discloses a big reduction ratio combination type rotary drive mechanism with self -locking in the field of mechanical drive, including transmission box body and the annular outer ring fixed frame of integrally formed in transmission box body periphery, transmission box body bottom is connected with input flange through screw, transmission box body inside is located input flange and is provided with input shaft, input shaft one end portion is installed with driving bevel gear, transmission box body inner bottom both sides are installed with bearing seat through screw, and the worm is rotatably connected between two bearing seats, and one end of the worm passes through one bearing seat and is connected with driven bevel gear that meshes with driving bevel gear through key. Adopt this kind of combination type drive structure to replace multistage gear reduction, reduce axial space occupancy, and the mechanism reduces the use number of shaft coupling, bearing, reduces the assembly error risk.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission, specifically a combined rotary drive mechanism with a large reduction ratio and self-locking. Background Technology

[0002] In the field of mechanical transmission, rotary drive mechanisms are the core components for realizing the rotation of loads around a fixed axis, and are widely used in engineering machinery, automated production lines, heavy equipment, and other scenarios. Currently, rotary drive mechanisms on the market have significant drawbacks: First, insufficient reduction ratio and torque. Traditional single-stage or simple multi-stage transmissions have low overall reduction ratios, making it difficult to meet the demands of heavy loads. Connecting multiple gearboxes in series leads to a bulky structure. Second, a lack of reliable self-locking function. Most require additional electromagnetic or hydraulic braking devices, increasing costs and assembly complexity, and posing a risk of brake failure. Third, loose structure and accumulated errors. Multi-stage transmissions rely on couplings to connect multiple independent units, resulting in large axial space occupation. Assembly errors reduce transmission accuracy and weaken system rigidity. Fourth, poor protection performance. Core components are easily exposed or poorly sealed, making them susceptible to dust intrusion and grease splashing, leading to accelerated wear and increased maintenance costs. Fifth, poor transmission smoothness. Inadequate support design can easily cause axial movement and radial wobble, resulting in high noise and speed fluctuations, failing to meet high-precision control requirements.

[0003] Therefore, those skilled in the art have provided a combined rotary drive mechanism with a large reduction ratio and self-locking to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a combined rotary drive mechanism with a large reduction ratio and self-locking to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A combined rotary drive mechanism with a large reduction ratio and self-locking includes a transmission housing and an annular outer ring fixing frame integrally formed around the transmission housing. The transmission housing has uniformly distributed weight-reducing grooves on its outer side. An input flange is connected to the bottom of the transmission housing by screws. An input shaft is provided inside the transmission housing at the input flange. A drive bevel gear is installed at one end of the input shaft. Bearing seats are installed on both sides of the bottom of the transmission housing by screws. A worm gear is rotatably connected between the two bearing seats. One end of the worm gear passes through one of the bearing seats and is connected by a key to a driven bevel gear that meshes with the drive bevel gear.

[0007] Inside the transmission housing, a transmission support shaft is fixedly connected to one side of the worm. From bottom to top, an external transmission gear ring and a copper worm wheel are arranged around the transmission support shaft. The copper worm wheel meshes with the worm. Inside the outer ring fixed frame, an internal transmission gear ring is rotatably arranged, meshing with the external transmission gear ring. The worm and the copper worm wheel cooperate to form a self-locking structure.

[0008] As a further embodiment of this utility model: the input shaft and the bevel gear are connected by a key and then tightened by screws. The input shaft is rotatably connected to the transmission housing through a deep groove ball bearing and a double row cylindrical roller bearing to achieve upper and lower support.

[0009] The driven bevel gear and the worm are connected by a shaft hole and a key, and then locked together by screws; each end of the worm is supported by a tapered roller bearing connected to a bearing housing.

[0010] The copper worm gear and the transmission outer gear ring are positioned by tapered pins and fixed together by screws. Both the copper worm gear and the transmission outer gear ring are supported by support roller bearings.

[0011] The driving bevel gear and the driven bevel gear are alloy steel bevel gears with 90° steering capability.

[0012] The worm is a carburized steel worm, and the copper worm wheel is an aluminum bronze worm wheel.

[0013] When the worm gear and the copper worm wheel work together for transmission, the rotational speed can reach 10 revolutions per minute.

[0014] The key connection between the bevel gear and the worm gear is a tight fit.

[0015] The top surface of the transmission housing is connected to the housing top cover by screws, and the side surface of the transmission housing is connected to the housing side cover by screws. The top of the outer ring fixing frame is located outside the transmission inner gear ring and is connected to the gear ring cover by screws. The gear ring cover, the housing top cover, and the housing side cover form a fully protective structure that can prevent internal grease or oil from splashing and block external dust and other impurities from entering.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. High reduction ratio and high torque: It adopts a multi-stage combination transmission of "bevel gear pair + worm gear pair + internal and external gear ring pair", with a total reduction ratio of 250-300, which can stably transmit torque ≥2000N•m, meeting the requirements of heavy load rotation.

[0018] 2. Reliable self-locking and safety: The lead angle of the worm and the copper worm wheel is ≤3°, with a built-in self-locking function. No additional braking device is required, which can prevent the load from rotating in the opposite direction and improve operational safety.

[0019] 3. Compact structure and low error: The integrated combined transmission replaces the traditional multi-stage gearbox series, reducing the axial space occupation by more than 40%; reducing the number of parts such as couplings and bearings (reducing by ≥30%), with cumulative assembly error ≤0.1mm, and increasing system rigidity by 25%.

[0020] 4. Long lifespan and low maintenance: IP65-rated fully enclosed protective structure prevents dust, moisture intrusion and grease splashing, reduces the wear rate of core components by more than 50%, has a service life of over 8000 hours, extends the maintenance cycle to 12 months, and reduces maintenance costs by 60%.

[0021] 5. Smooth transmission and high precision: Multiple types of bearings work together to limit axial movement and radial wobble, improving transmission smoothness by 40% and operating noise ≤65dB; core components are machined with high precision (gears and worm gears have a precision of level 6), with a rotational accuracy ≤0.02° / r, meeting the needs of high-precision control scenarios. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a rear view structural diagram of the present invention;

[0024] Figure 3 This is an exploded view of the present invention;

[0025] Figure 4 This utility model Figure 3 A magnified view of a portion of point A in the middle.

[0026] In the diagram: 1. Transmission housing; 101. Weight reduction groove; 2. Outer ring fixing frame; 3. Input flange; 4. Power input shaft; 5. Top cover of housing; 6. Side cover of housing; 7. Driving bevel gear; 8. Driven bevel gear; 9. Bearing housing; 10. Worm; 11. Copper worm gear; 12. Transmission support shaft; 13. Support roller bearing; 14. External transmission gear ring; 15. Internal transmission gear ring; 16. Gear ring cover. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-4In this embodiment of the present invention, a combined rotary drive mechanism with a large reduction ratio and self-locking includes a transmission housing 1 and an annular outer ring fixing frame 2 integrally formed around the transmission housing 1; the outer side of the transmission housing 1 is provided with uniformly distributed weight-reducing grooves 101, which reduce the overall weight while ensuring the rigidity of the housing structure; the bottom of the transmission housing 1 is connected to an input flange 3 by screws for connecting to an external power source (such as a hydraulic motor, servo motor, etc.); a power input shaft 4 is rotatably arranged inside the transmission housing 1 at the input flange 3. One end of the power input shaft 4 is connected to a drive bevel gear 7 via a flat key and secured with screws; bearing seats 9 are installed on both sides of the bottom of the transmission housing 1 via screws, and a worm gear 10 is rotatably connected between the two bearing seats 9 via tapered roller bearings. One end of the worm gear 10 passes through one of the bearing seats 9 and is then connected to a driven bevel gear 8 via a shaft hole, a flat key, and a circumferential screw. The driven bevel gear 8 and the drive bevel gear 7 are precisely meshed (meshing clearance controlled within 0.1-0.15mm).

[0029] Inside the transmission housing 1, a transmission support shaft 12 is bolted to one side of the worm gear 10. From bottom to top, the outer periphery of the transmission support shaft 12 is fitted with a transmission outer gear ring 14 and a copper worm wheel 11. The copper worm wheel 11 and the transmission outer gear ring 14 are positioned by tapered pins and then fastened together by circumferentially distributed screws to ensure no relative rotation between them. The copper worm wheel 11 meshes with the worm gear 10 to form a worm gear pair (meshing clearance controlled at 0.15-0.2 mm), and the lead angle of this worm gear pair is ≤3°, possessing self-locking characteristics. Both the copper worm wheel 11 and the transmission outer gear ring 14 are supported on the transmission support shaft 12 by support roller bearings 13 (cylindrical roller bearings), enabling flexible rotation.

[0030] The inner gear ring 15 is rotatably mounted inside the outer ring fixing frame 2 via a slewing bearing structure. The inner gear ring 15 meshes with the outer gear ring 14 to form an inner and outer gear ring pair (meshing clearance controlled at 0.2-0.25mm). The top surface of the transmission housing 1 is connected to the housing top cover 5 by screws, and the side of the transmission housing 1 is connected to the housing side cover 6 by screws. The top of the outer ring fixing frame 2 is located outside the inner gear ring 15 and is connected to the gear ring cover 16 by screws. The connection points of the gear ring cover 16, the housing top cover 5, and the housing side cover 6 are all provided with nitrile rubber sealing rings, which together form a fully protective structure with a sealing rating of IP65.

[0031] 1. Assembly steps

[0032] ① Power input assembly: Press-fit the deep groove ball bearing and the double row cylindrical roller bearing into the bearing hole of the input flange 3, then insert the power input shaft 4 into the input flange 3, connect the drive bevel gear 7 through the flat key, and use the shaft shoulder retaining ring and screws to achieve axial positioning, ensuring that the power input shaft 4 rotates smoothly and without radial wobble.

[0033] ② Worm-driven bevel gear assembly assembly: The driven bevel gear 8 and the worm 10 are connected by a flat key and circumferentially locked with three hexagon socket screws; then the tapered roller bearings at both ends of the worm 10 are press-fitted into the bearing housing 9, and the cylindrical roller bearing is press-fitted into the end of the driven bevel gear 8 away from the worm 10. The entire assembly is then installed into the corresponding mounting hole of the transmission housing 1, and the meshing clearance between the driving bevel gear 7 and the driven bevel gear 8 is adjusted to 0.1-0.15mm.

[0034] ③ Assembly of copper worm gear-transmission external gear ring assembly: Use two tapered pins to position the copper worm gear 11 and the transmission external gear ring 14, and then tighten them with four M10 socket head cap screws; put the assembly on the transmission support shaft 12, press-fit the support roller bearing 13, and then install it into the transmission housing 1, and adjust the meshing clearance between the worm 10 and the copper worm gear 11 to 0.15-0.2mm.

[0035] ④ Assembly of output and protection components: Connect the transmission internal gear ring 15 to the outer ring fixing frame 2 with M16 bolts, and adjust the meshing clearance between the transmission internal gear ring 15 and the transmission external gear ring 14 to 0.2-0.25mm; install the gear ring cover 16 (with Φ20 nitrile rubber sealing ring), the box side cover 6, and the box top cover 5 in sequence, and tighten them with bolts to form a fully enclosed protective space.

[0036] ⑤ Lubrication and testing: Inject No. 3 lithium-based grease into the enclosed space (filling amount is 1 / 3 of the internal space); manually rotate the power input shaft 4 to check whether the rotation of each component is smooth (rotation resistance torque ≤ 5 N•m); then conduct a no-load test run (speed 1000 r / min, run for 30 min, noise ≤ 62dB).

[0037] 2. Work Process

[0038] An external power source (such as a hydraulic motor) drives the power input shaft 4 to rotate via a coupling. The power is transmitted to the driven bevel gear 8 via the driving bevel gear 7 (first-stage reduction, the transmission ratio is determined by the number of teeth of the bevel gears, e.g., driving bevel gear with 18 teeth, driven bevel gear with 36 teeth, transmission ratio 1:2), which in turn drives the worm gear 10 to rotate. The worm gear 10 meshes with the copper worm wheel 11 (second-stage reduction, transmission ratio ≥40), driving the transmission outer gear ring 14 to rotate. The transmission outer gear ring 14 meshes with the transmission inner gear ring 15 (third-stage reduction, transmission ratio ≥6), ultimately driving the transmission inner gear ring 15 to rotate at low speed and high torque, realizing the rotation of the load.

[0039] When the load generates a reverse torque, since the lead angle of the worm 10 and the copper worm wheel 11 is ≤3°, the self-locking condition is met. The transmission internal gear ring 15 cannot drive the transmission external gear ring 14, the copper worm wheel 11 and the worm 10 to rotate in the reverse direction, thereby preventing the load from unexpectedly reversing and improving operational safety.

[0040] By optimizing the combined transmission structure, employing a multi-type bearing collaborative support design, and implementing a fully enclosed protective seal, a multi-stage combined transmission of "driving bevel gear - driven bevel gear → worm - copper worm wheel → external transmission gear ring - internal transmission gear ring" is achieved, resulting in a large reduction ratio of 250-300 and a high torque transmission of ≥2000 N•m, meeting the requirements of heavy-duty load rotation. Furthermore, the inherent self-locking characteristic of the worm gear pair eliminates the need for additional braking devices, preventing accidental load reversal and improving operational safety. Simultaneously, the integrated structure reduces axial space occupation and the number of parts, minimizing assembly errors. Enhanced system rigidity and fully enclosed protection (IP65 rating) prevent impurities from entering and grease from leaking out, reducing the wear rate of core components by more than 50%, maintenance costs by 60%, and extending service life to more than 8000 hours. In addition, multi-bearing cooperation restricts swaying and shaking, and with high-precision machined transmission parts, transmission smoothness is improved by 40%, noise is ≤65dB, and rotational accuracy is ≤0.02 / r, meeting the needs of high-precision control scenarios. It comprehensively solves the problems of insufficient reduction ratio, unreliable self-locking, loose structure, poor protection, and unstable transmission in traditional rotary drive mechanisms.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A combined rotary drive mechanism with high reduction ratio and self-locking, characterized in that, The transmission housing includes a transmission housing (1) and an annular outer ring fixing frame (2) integrally formed around the transmission housing (1). The transmission housing (1) has uniformly distributed weight-reducing grooves (101) on its outer side. The bottom of the transmission housing (1) is connected to an input flange (3) by screws. An input shaft (4) is provided inside the transmission housing (1) at the input flange (3). A drive bevel gear (7) is installed at one end of the input shaft (4). Bearing seats (9) are installed on both sides of the bottom of the transmission housing (1) by screws. A worm gear (10) is rotatably connected between the two bearing seats (9). One end of the worm gear (10) passes through one of the bearing seats (9) and is connected by a key to a driven bevel gear (8) that meshes with the drive bevel gear (7). The transmission housing (1) has a transmission support shaft (12) fixedly connected to one side of the worm (10) inside. The transmission support shaft (12) is provided with an external transmission gear ring (14) and a copper worm wheel (11) from bottom to top on the periphery of the transmission support shaft (12). The copper worm wheel (11) meshes with the worm (10). The outer ring fixed frame (2) is rotatably provided with an internal transmission gear ring (15) that meshes with the external transmission gear ring (14). The worm (10) and the copper worm wheel (11) cooperate to form a self-locking structure. The top surface of the transmission housing (1) is connected to the housing top cover (5) by screws, and the side surface of the transmission housing (1) is connected to the housing side cover (6) by screws. The top of the outer ring fixing frame (2) is located outside the transmission inner gear ring (15) and is connected to the gear ring cover (16) by screws. The gear ring cover (16), the housing top cover (5) and the housing side cover (6) form a fully protective structure.

2. The combined rotary drive mechanism with high reduction ratio and self-locking according to claim 1, characterized in that, The input shaft (4) is connected to the drive bevel gear (7) by a key and then tightened by screws. The input shaft (4) is rotatably connected to the transmission housing (1) by a deep groove ball bearing and a double row cylindrical roller bearing to achieve upper and lower support.

3. The combined rotary drive mechanism with high reduction ratio and self-locking according to claim 1, characterized in that, The driven bevel gear (8) and the worm (10) are connected by a shaft hole and a key and then locked together by screws; the two ends of the worm (10) are supported by a tapered roller bearing connected to the bearing seat (9).

4. The combined rotary drive mechanism with high reduction ratio and self-locking according to claim 1, characterized in that, The copper worm gear (11) and the transmission outer gear ring (14) are positioned by tapered pins and fixed together by screws. Both the copper worm gear (11) and the transmission outer gear ring (14) are supported by support roller bearings (13).

5. The combined rotary drive mechanism with high reduction ratio and self-locking according to claim 1, characterized in that, The driving bevel gear (7) and the driven bevel gear (8) are alloy steel bevel gears with 90° steering capability.

6. The combined rotary drive mechanism with high reduction ratio and self-locking according to claim 1, characterized in that, The worm (10) is a carburized steel worm, and the copper worm wheel (11) is an aluminum bronze worm wheel.

7. The combined rotary drive mechanism with high reduction ratio and self-locking according to claim 3, characterized in that, When the worm (10) and the copper worm wheel (11) work together for transmission, the rotational speed can reach 10 revolutions per minute.

8. The combined rotary drive mechanism with high reduction ratio and self-locking according to claim 1, characterized in that, The key connection between the drive bevel gear (7) and the worm (10) is a tight fit.

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