Self-locking release and auxiliary braking device for worm gear reducer

Abstract

The utility model relates to worm reduction gear technical field discloses worm reduction gear self -locking removes and auxiliary braking device, including reduction gear main part, the right -hand member of reduction gear main part is provided with worm end input shaft, the inside bearing of reduction gear main part is installed, the inside self -locking removes mechanism of reduction gear main part is provided with auxiliary braking mechanism, the outside of worm end input shaft is provided with auxiliary braking mechanism, the self -locking removes structure includes the support ring fixed mounting in the right -hand member of reduction gear main part, the inner wall rotation of support ring is connected with transmission shaft, in the utility model, the operator only needs to rotate the handle on the turntable, can drive the runner and the flange on transmission shaft and form cam drive sleeve, then cooperate fixed base and top block transmission, make top block act on bearing and then promote worm end input shaft axial displacement, remove the self -locking between worm and worm gear tooth surface, and the operation is simple and quick, can carry out manual position adjustment safely and efficiently.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, and in particular to a self-locking release and auxiliary braking device for worm gear reducers. Background Technology

[0002] Worm gear reducers, as an important transmission device, are widely used in many fields such as lifting machinery, conveying equipment, automated production lines, stage equipment, and medical devices due to their advantages such as large transmission ratio, compact structure, smooth operation, and low noise. Worm gear reducers typically possess an inherent self-locking characteristic. This characteristic means that when the worm acts as the driving element, it can drive the worm wheel normally. However, when a load attempts to drive the worm in the opposite direction via the worm wheel, the transmission chain will reliably lock because the frictional torque between the tooth surfaces is greater than the driving torque. In applications requiring maintaining the load position, such as lifting, hoisting, or tilting, this characteristic is an important safety feature, effectively preventing the load from accidentally slipping due to gravity in the event of an unexpected power outage or equipment cessation of operation.

[0003] A search revealed Chinese patent publication number CN206206504U, which discloses a worm gear reducer with a self-locking mechanism. The reducer includes a wrench, a preload nut, a first spring, a slot, a worm gear shaft, a guide block, a lever, a first bearing, a worm gear, a second bearing, a second spring, a clutch, a worm, a cover, a bearing assembly, and a housing. When the lever is turned by the wrench, the clutch disengages from the worm gear, allowing the worm gear to idle on the worm gear shaft, thus releasing the self-locking mechanism of the worm gear reducer. This reducer, while reducing the overall size of traditional reducers, removes the self-locking characteristic of the worm gear, thereby further expanding the application range of worm gear reducers; it also retains the characteristic of a relatively large reduction ratio.

[0004] The aforementioned patent specification mentions that "when the lever is turned by a wrench, the clutch disengages from the worm gear, allowing the worm gear to idle on the worm gear shaft, thus releasing the self-locking of the worm gear reducer." While the patent solves the problem of forcibly releasing the reducer's self-locking when manual adjustment is required, existing technology merely disengages the worm gear from the output shaft to achieve idle rotation without providing any braking or control mechanism. Under load (especially gravity load), once the self-locking is released, the output end will immediately lose control and accelerate, easily leading to serious safety accidents such as equipment damage or personal injury. Therefore, a self-locking release and auxiliary braking device for worm gear reducers is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a self-locking release and auxiliary braking device for worm gear reducers, aiming to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A worm gear reducer self-locking release and auxiliary braking device includes a reducer body, a worm end input shaft is provided at the right end of the reducer body, a bearing is installed inside the reducer body, a self-locking release mechanism is provided inside the reducer body, and an auxiliary braking mechanism is provided outside the worm end input shaft; The self-locking release structure includes a support ring fixedly installed on the right end of the reducer body. A drive shaft is rotatably connected to the inner wall of the support ring. A turntable is fixedly installed at the end of the drive shaft away from the reducer body. A wheel is fixedly connected to the outer wall of the drive shaft near the reducer body. A flange is provided on the outside of the wheel. A chamber is opened inside the reducer body. A top block is slidably connected to the inner wall of the top of the chamber. A fixed seat is fixedly connected to the bottom end of the top block. A sleeve is rotatably connected to the bottom of the fixed seat. As a further description of the above technical solution: The end of the drive shaft away from the turntable is rotatably supported inside the reducer body, and a handle for manual operation is installed on the side of the turntable away from the reducer body. As a further description of the above technical solution: The outer periphery of the wheel and its flange together form a cam, and the sleeve acts as a follower and abuts against the cam. As a further description of the above technical solution: The bearing is sleeved on the outer wall of the worm end input shaft, and the top side of the top block abuts against the outer ring end face of the bearing; As a further description of the above technical solution: The auxiliary braking mechanism includes an end cover fixedly installed on the right end of the reducer body, the outer wall of the worm input shaft is rotatably connected to the inner wall of the end cover, a brake disc is fixedly connected to the outer wall of the worm input shaft, the end cover supports a brake pad through a reset assembly, and the brake pad contacts the surface of the brake disc through a transmission assembly. As a further description of the above technical solution: The reset assembly includes two sliding rods fixedly connected to the right side of the brake pad. The two sliding rods slide through the end cap. A reset spring is sleeved on the rod portion of each sliding rod. One end of the reset spring abuts against the end cap, and the other end abuts against the end of the sliding rod. As a further description of the above technical solution: The transmission assembly includes wedge-shaped blocks fixed at both ends of the turntable, and a push block is fixedly connected to the side of the brake pad away from the reducer body; As a further description of the above technical solution: The push block is slidably disposed on the inner wall of the end cover, the inclined surface of the wedge block cooperates with the push block, and the interior of the end cover is provided with an annular groove for accommodating the brake disc.

[0007] This utility model has the following beneficial effects: 1. In this utility model, the operator only needs to turn the handle mounted on the turntable to drive the transmission shaft to rotate. The rotating wheel and flange on it form a cam, which precisely pushes the sleeve as the driven part. This thrust is transmitted through the fixed seat and the top block, causing the top block to slide in the cavity and accurately act on the outer ring end face of the bearing, thereby pushing the worm end input shaft to produce a small axial displacement, which instantly breaks the static friction balance between the worm wheel and the worm tooth surface. This design does not require disassembly of parts, is simple and quick to operate, and because the displacement is small and controlled, it avoids impact and damage to the gear reducer gears and bearings, ensuring that manual position adjustment can be performed safely and efficiently during power failure or maintenance.

[0008] 2. In this utility model, when the operator continuously rotates the handle, the wedge block fixed on the turntable rotates accordingly. Its inclined surface cooperates with the push block to convert the rotational motion of the turntable into the axial linear motion of the push block. The push block then drives the brake pad to overcome the elastic force of the reset spring in the reset assembly and presses the brake disc fixed to the input shaft of the worm gear along the direction of the sliding rod. This linkage design achieves a seamless connection of "first releasing the self-lock, then applying the brake". The operator can control the rotation angle of the handle to precisely adjust the pressure of the brake pad pressing the brake disc, thereby obtaining a controllable braking torque, so that the load can be smoothly lowered at the expected speed or held at any position, effectively avoiding the risk of load runaway and greatly improving the safety of the equipment in manual operation or emergency situations. Attached Figure Description

[0009] Figure 1 This is a perspective view of the self-locking release and auxiliary braking device for the worm gear reducer proposed in this utility model. Figure 2 This is a schematic diagram of the turntable structure of the self-locking release and auxiliary braking device for the worm gear reducer proposed in this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the end cover of the self-locking release and auxiliary braking device for the worm gear reducer proposed in this utility model.

[0010] Legend: 1. Reducer body; 2. Worm gear input shaft; 3. Bearing; 4. Support ring; 5. Drive shaft; 6. Turntable; 7. Wheel; 8. Flange; 9. Top block; 10. Fixed seat; 11. Sleeve; 12. Chamber; 13. Wedge block; 14. End cover; 15. Brake disc; 16. Sliding rod; 17. Brake pad; 18. Return spring; 19. Push block; 20. Annular groove. Detailed Implementation

[0011] 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.

[0012] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment of a worm gear reducer self-locking release and auxiliary braking device, including a reducer body 1. The reducer body 1 serves as the base of the entire device, providing a stable installation space and support for all internal transmission and control components. A worm end input shaft 2 is provided at the right end of the reducer body 1. The worm end input shaft 2 is the core component for power input and self-locking characteristics. A bearing 3 is installed inside the reducer body 1. The bearing 3 is sleeved on the outer wall of the worm end input shaft 2. The bearing 3 supports the worm end input shaft 2 and ensures its rotational accuracy. A self-locking release mechanism is provided inside the reducer body 1, and an auxiliary braking mechanism is provided outside the worm end input shaft 2. The self-locking release structure includes a support ring 4 fixedly installed at the right end of the reducer body 1. A drive shaft 5 is rotatably connected to the inner wall of the support ring 4, providing a reliable rotational support base for the drive shaft 5. A turntable 6 is fixedly installed at the end of the drive shaft 5 away from the reducer body 1. A handle for manual operation is installed on the side of the turntable 6 away from the reducer body 1, allowing the operator to transmit manual operating force to the turntable 6 by rotating the handle. The end of the drive shaft 5 away from the turntable 6 is rotatably supported inside the reducer body 1. A wheel 7 is fixedly connected to the outer wall of the drive shaft 5 near the reducer body 1. A flange 8 is provided on the outside of the wheel 7. The outer periphery and the flange 8 together form a cam. The reducer body 1 has a chamber 12 inside. The top inner wall of the chamber 12 is slidably connected to a top block 9. The top side of the top block 9 abuts against the outer ring end face of the bearing 3. The bottom end of the top block 9 is fixedly connected to a fixed seat 10. The bottom of the fixed seat 10 is rotatably connected to a sleeve 11. The sleeve 11 acts as a follower and abuts against the cam. When the cam rotates, it is pushed and generates axial displacement. The function of the fixed seat 10 is to reliably transmit the displacement of the sleeve 11 to the top block 9. Under the guidance of the chamber 12, the top block 9 slides stably along the axial direction. Its top side applies the thrust precisely to the outer ring end face of the bearing 3.

[0013] Reference Figure 1 and Figure 4 The auxiliary braking mechanism includes an end cover 14 fixedly installed on the right end of the reducer body 1. The outer wall of the worm input shaft 2 is rotatably connected to the inner wall of the end cover 14. A brake disc 15 is fixedly connected to the outer wall of the worm input shaft 2. The brake disc 15 is the core rotating component that generates braking friction force and rotates synchronously with the worm input shaft 2. The end cover 14 supports the brake pad 17 through a reset assembly. The reset assembly includes two sliding rods 16 fixedly connected to the right side of the brake pad 17. The two sliding rods 16 slide through the end cover 14. A reset spring 18 is sleeved on the rod of the sliding rod 16. One end of the reset spring 18 abuts against the end cover 14, and the other end abuts against the end of the sliding rod 16. The reset spring 18 sleeved on the sliding rod 16 is always in a pre-compressed state. Its elastic force continuously pushes the brake pad 17 away from the brake disc 15. The braking will only be effective when the external thrust is greater than the spring preload. Once the external force is removed, the spring will immediately push the brake pad 17 to reset and release the braking, ensuring the reliability and safety of the system. The brake pad 17 contacts the surface of the brake disc 15 through the transmission assembly. When the brake pad 17 presses against the brake disc 15, the frictional torque generated between them directly acts on the input shaft 2 at the worm end, thereby achieving deceleration or braking of the entire transmission system and effectively preventing the load from running out of control after the self-locking is released. The transmission assembly includes wedge blocks 13 fixed at both ends of the turntable 6. A push block 19 is fixedly connected to the side of the brake pad 17 away from the reducer body 1. The push block 19 is slidably disposed on the inner wall of the end cover 14. The inclined surface of the wedge block 13 is perpendicular to the push block 19. In conjunction with the 9, the inclined surface design of the wedge block 13 as the driving element cleverly converts the rotational motion of the turntable 6 into axial thrust. The push block 19, as the driven element, has one end engaged with the inclined surface of the wedge block 13 and the other end fixedly connected to the brake pad 17. When the turntable 6 rotates, the wedge block 13 pushes the push block 19, which in turn drives the brake pad 17 to overcome the elastic force of the return spring 18 and press against the brake disc 15. This wedge transmission design not only achieves linkage but also has a certain force amplification effect, allowing the operator to generate a large braking force with a small torque. The end cover 14 has an annular groove 20 inside for accommodating the brake disc 15. The end cover 14 is the overall mounting base for the auxiliary braking mechanism, providing precise installation and positioning for components such as the brake disc 15, brake pads 17, sliding rod 16, and return spring 18. The annular groove 20 inside provides the necessary space for the rotation of the brake disc 15, ensuring that the brake disc 15 will not interfere with other components when rotating. At the same time, the inner wall of the end cover 14 also provides guidance for the axial sliding of the push block 19 and the sliding rod 16.

[0014] Working principle: When manual adjustment or load release is required, the operator rotates the handle mounted on the turntable 6 to drive the transmission shaft 5 to rotate together. As the transmission shaft 5 rotates, the cam formed by the fixed wheel 7 and its external flange 8 also rotates. The cam abuts against the sleeve 11, which is the driven member. The change in its profile pushes the sleeve 11. This thrust is transmitted to the top block 9 through the fixed seat 10 connected to the sleeve 11. The top block 9 slides upward in the chamber 12. Its top side abuts against the outer ring end face of the bearing 3 of the worm end input shaft 2, thereby pushing the entire bearing 3 together with the worm end input shaft 2 it supports to produce a small axial displacement. This axial displacement disrupts the static friction balance between the worm wheel and the worm tooth surface, thereby instantly and reliably releasing the self-locking state of the reducer, so that the output end can be driven in reverse. Simultaneously or after the self-locking release mechanism is activated, as the operator continues to turn the handle, the turntable 6 rotates, and the wedge block 13 fixed on the turntable 6 also rotates synchronously. The inclined surface of the wedge block 13 cooperates with the push block 19 to convert the rotational motion of the turntable 6 into the axial linear motion of the push block 19. Since the push block 19 is fixedly connected to the brake pad 17, the push block 19 will drive the brake pad 17 to overcome the elastic force of the return spring 18 in the reset assembly and press it along the direction of the sliding rod 16 against the brake disc 15 that rotates together with the worm end input shaft 2. The brake pad 17 contacts the surface of the brake disc 15 and generates friction, thereby applying a controllable braking force to the worm end input shaft 2 to prevent the load from going out of control after the self-locking is released. The magnitude of the braking force is proportional to the rotation angle of the handle, thus achieving safe control of the load. When the handle is released, the return spring 18 will push the brake pad 17 to automatically reset and release the brake.

[0015] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-locking release and auxiliary braking device for a worm gear reducer, comprising a reducer body (1), characterized in that: The right end of the reducer body (1) is provided with a worm end input shaft (2), the inside of the reducer body (1) is provided with a bearing (3), the inside of the reducer body (1) is provided with a self-locking release mechanism, and the outside of the worm end input shaft (2) is provided with an auxiliary braking mechanism. The self-locking release mechanism includes a support ring (4) fixedly installed on the right end of the reducer body (1). A drive shaft (5) is rotatably connected to the inner wall of the support ring (4). A turntable (6) is fixedly installed at the end of the drive shaft (5) away from the reducer body (1). A wheel (7) is fixedly connected to the outer wall of the drive shaft (5) near the reducer body (1). A flange (8) is provided on the outside of the wheel (7). A chamber (12) is opened inside the reducer body (1). A top block (9) is slidably connected to the inner wall of the top of the chamber (12). A fixed seat (10) is fixedly connected to the bottom end of the top block (9). A sleeve (11) is rotatably connected to the bottom of the fixed seat (10).

2. The worm gear reducer self-locking release and auxiliary braking device according to claim 1, characterized in that: The end of the drive shaft (5) away from the turntable (6) is rotatably supported inside the reducer body (1), and a handle for manual operation is installed on the side of the turntable (6) away from the reducer body (1).

3. The worm gear reducer self-locking release and auxiliary braking device according to claim 1, characterized in that: The outer periphery of the wheel (7) and its flange (8) together form a cam, and the sleeve (11) acts as a follower and abuts against the cam.

4. The worm gear reducer self-locking release and auxiliary braking device according to claim 1, characterized in that: The bearing (3) is sleeved on the outer wall of the worm end input shaft (2), and the top side of the top block (9) abuts against the outer ring end face of the bearing (3).

5. The worm gear reducer self-locking release and auxiliary braking device according to claim 1, characterized in that: The auxiliary braking mechanism includes an end cover (14) fixedly installed on the right end of the reducer body (1), the outer wall of the worm input shaft (2) is rotatably connected to the inner wall of the end cover (14), a brake disc (15) is fixedly connected to the outer wall of the worm input shaft (2), and a brake pad (17) is moved and supported by the end cover (14) through a reset assembly. The brake pad (17) is in contact with the surface of the brake disc (15) through a transmission assembly.

6. The worm gear reducer self-locking release and auxiliary braking device according to claim 5, characterized in that: The reset assembly includes two sliding rods (16) fixedly connected to the right side of the brake pad (17). The two sliding rods (16) slide through the end cap (14). A reset spring (18) is sleeved on the rod part of the sliding rod (16). One end of the reset spring (18) abuts against the end cap (14), and the other end abuts against the end of the sliding rod (16).

7. The worm gear reducer self-locking release and auxiliary braking device according to claim 5, characterized in that: The transmission assembly includes wedge blocks (13) fixed at the front and rear ends of the turntable (6), and a push block (19) is fixedly connected to the side of the brake pad (17) away from the reducer body (1).

8. The worm gear reducer self-locking release and auxiliary braking device according to claim 7, characterized in that: The push block (19) is slidably disposed on the inner wall of the end cover (14), the inclined surface of the wedge block (13) cooperates with the push block (19), and the end cover (14) has an annular groove (20) for accommodating the brake disc (15).

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