Chain wheel capable of preventing chain from falling off

Abstract

The utility model relates to the technical field of chain wheels, and discloses a chain-off-preventing chain wheel which comprises a protective shell and a chain wheel body, the chain wheel body is arranged in the protective shell, the rear surface of the protective shell is fixedly connected with a connecting disc, the upper end of the connecting disc is fixedly connected with a mounting plate, and the center of the surface of the connecting disc is rotationally connected with a rotating shaft. The end of the rotating shaft penetrates through the protective shell and is rotationally connected with the inner wall of the protective shell, the surface of the rotating shaft is fixedly connected with the chain wheel body, first connecting shafts are rotationally connected to the upper end and the lower end of the rear surface of the connecting disc, connecting rods are fixedly connected to the surfaces of the first connecting shafts, and auxiliary chain wheels are arranged at the ends, away from the first connecting shafts, of the connecting rods. Auxiliary structures are arranged between the auxiliary chain wheels and the chain wheel bodies and between the auxiliary chain wheels and the connecting rods, the auxiliary chain wheels at the two ends can be supported towards the upper end and the lower end by arranging the auxiliary structures, shaking and jumping of the chain in the transmission process can be reduced by opening the chain, and the transmission stability is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of sprocket wheels, in particular to a sprocket wheel which can prevent the chain from falling off. Background Art

[0002] A sprocket is a component in a mechanical transmission system. It is usually made of metal and has a gear-like structure. Sprockets are usually used in conjunction with chains to achieve the rotational transmission of the mechanical device through the transmission of the chain. The main function of sprockets is to transmit power and rotational motion. They are commonly found in bicycles, motorcycles, industrial machinery and other equipment.

[0003] In the prior art, patent application number CN215720649U discloses a sprocket for preventing chain from falling off, comprising a sprocket main body, the outer circumference of the sprocket main body is connected to a plurality of gear teeth, the front and rear side surfaces of the sprocket main body are connected to a plurality of fixed blocks, a cavity is opened inside the fixed block, a sliding block is slidably connected inside the cavity, a limiting plate is slidably penetrated on one side of the outer surface of the fixed block, a tooth groove is arranged between each adjacent gear teeth, a buffer block is arranged in the tooth groove, the sprocket is easy to use, the installed chain can be limited by the limiting plates on the front and rear sides, so as to prevent the chain from falling off, the buffer block is used to buffer the transmission chain and prevent it from falling off due to chain vibration, the sprocket main body can effectively reduce the probability of working failures such as chain falling off, making the working process smooth.

[0004] With respect to the above scheme, there are the following technical problems: in daily life, some devices and mechanical structures use sprockets for transmission, but during the use of the sprocket, the chain often comes off or breaks, causing damage to the device. The repair of the sprocket is not only very difficult, but also requires energy and money to repair, affecting the working efficiency of the device and the mechanical structure, and bringing many inconveniences to work and life. Therefore, the sprocket in the prior art has the defect of easy chain coming off. Utility Model Content

[0005] The utility model aims to provide a sprocket wheel for preventing chain from falling off, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sprocket for preventing chain from falling off, comprising a protective shell and a sprocket body, the sprocket body is arranged inside the protective shell, a connecting disc is fixedly connected to the rear surface of the protective shell, a mounting plate is fixedly connected to the upper end of the connecting disc, a rotating shaft is rotatably connected to the center position of the surface of the connecting disc, the end of the rotating shaft passes through the protective shell and is rotatably connected to the inner wall of the protective shell, the surface of the rotating shaft is fixedly connected to the sprocket body, the upper and lower ends of the rear surface of the connecting disc are rotatably connected to the first connecting shaft, the surface of the first connecting shaft is fixedly connected to a connecting rod, an auxiliary sprocket is arranged at one end of the connecting rod away from the first connecting shaft, an auxiliary structure is arranged between the connecting rods, the auxiliary structure lifts the auxiliary sprocket to both ends, the auxiliary sprocket supports the chain to the upper and lower ends, the chain is sleeved on the surface of the sprocket body, and the chain is also arranged at the upper and lower ends of the auxiliary sprocket, the first spring pushes the telescopic rod to the upper and lower ends, the telescopic rod then pushes the connecting rod and the auxiliary sprocket to both ends through the connecting block, and the auxiliary sprocket then supports the chain to both ends.

[0007] In a preferred embodiment of the utility model, the auxiliary structure includes a first sleeve and a first spring, the first spring is arranged on the inner wall of the first sleeve, both ends of the first spring are fixedly connected to the telescopic rod, one end of the telescopic rod away from the first spring is rotatably connected to a connecting block, and a side of the connecting block away from the telescopic rod is fixedly connected to the surface of the connecting rod.

[0008] In a preferred embodiment of the present invention, the end of the connecting rod is fixedly connected to a fixed plate, a limiting block is provided on one side of the fixed plate, an auxiliary sprocket is provided on the other side of the fixed plate, a second connecting shaft is fixedly connected between the limiting block and the auxiliary sprocket, and the second connecting shaft passes through the fixed plate and is rotatably connected to the fixed plate.

[0009] In a preferred embodiment of the present utility model, the upper and lower ends of the protective shell are fixedly connected with a fixing sleeve, the interior of the fixing sleeve is fixedly connected with a second sleeve, a second spring is arranged inside the second sleeve, one end of the second spring is fixedly connected to the inner wall of the second sleeve, the other end of the second spring is fixedly connected with a telescopic block, the end of the telescopic block passes through the second sleeve and is fixedly connected with a connecting frame, the interior of the connecting frame is rotatably connected with a pulley, the pulley limits the chain, the second spring pushes the telescopic block toward each other, the telescopic block drives the pulley through the connecting frame, the pulley limits the chain, and at the same time makes the chain close to the sprocket body.

[0010] Beneficial Effects

[0011] The utility model provides a sprocket wheel for preventing chain from falling off, which has the following beneficial effects:

[0012] 1. The anti-chain-off sprocket can prop up the auxiliary sprockets at both ends to the upper and lower ends by setting an auxiliary structure. Spreading the chain can reduce the shaking and jumping of the chain during the transmission process, maintain the stability of the transmission, reduce energy loss, prevent chain off, and at the same time increase the contact area between the chain and the sprocket, increase friction, and help improve transmission efficiency.

[0013] 2. The anti-chain-off sprocket can press the chain against the sprocket surface by setting a second spring and a pulley, thereby reducing the relative sliding between the chain and the sprocket, helping to improve transmission efficiency and reduce energy loss. At the same time, the pulley can limit the chain to prevent the chain from shaking left and right, keep the chain moving in the correct position, reduce the friction between the chain and other components, and reduce energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal three-dimensional front view structure of the protective shell of the utility model;

[0016] Figure 3 This is a schematic diagram of the internal three-dimensional rear view structure of the protective shell of the utility model;

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the fixing sleeve of the utility model;

[0018] Figure 5 This is a schematic diagram of the front section structure of the first sleeve of the utility model;

[0019] Figure 6 It is a schematic diagram of the front section structure of the fixing sleeve of the utility model.

[0020] In the figure: 1. protective shell; 2. sprocket body; 3. connecting disc; 4. rotating shaft; 5. first connecting shaft; 6. connecting rod; 7. auxiliary sprocket; 8. auxiliary structure; 9. first sleeve; 10. first spring; 11. telescopic rod; 12. connecting block; 13. fixing plate; 14. limiting block; 15. second connecting shaft; 16. fixing sleeve; 17. second sleeve; 18. second spring; 19. telescopic block; 20. connecting frame; 21. pulley. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-6 The utility model provides a technical solution: a sprocket for preventing chain from falling off, comprising a protective shell 1 and a sprocket body 2, the sprocket body 2 is arranged inside the protective shell 1, a connecting disc 3 is fixedly connected to the rear surface of the protective shell 1, a mounting plate is fixedly connected to the upper end of the connecting disc 3, a rotating shaft 4 is rotatably connected to the center position of the surface of the connecting disc 3, the end of the rotating shaft 4 passes through the protective shell 1 and is rotatably connected to the inner wall of the protective shell 1, the surface of the rotating shaft 4 is fixedly connected to the sprocket body 2, the upper and lower ends of the rear surface of the connecting disc 3 are rotatably connected to the first connecting shaft 5, the surface of the first connecting shaft 5 is fixedly connected to a connecting rod 6, an auxiliary sprocket 7 is arranged at one end of the connecting rod 6 away from the first connecting shaft 5, and a chain is sleeved on the surface of the sprocket body 2 and the auxiliary sprocket 7.

[0023] The end of the connecting rod 6 is fixedly connected to a fixed plate 13, a limit block 14 is arranged on one side of the fixed plate 13, the auxiliary sprocket 7 is arranged on the other side of the fixed plate 13, and a second connecting shaft 15 is fixedly connected between the limit block 14 and the auxiliary sprocket 7. The second connecting shaft 15 passes through the fixed plate 13 and is rotatably connected to the fixed plate 13.

[0024] An auxiliary structure 8 is arranged between the connecting rods 6, and the auxiliary structure 8 includes a first sleeve 9 and a first spring 10. The first spring 10 is arranged on the inner wall of the first sleeve 9. Both ends of the first spring 10 are fixedly connected with a telescopic rod 11. The end of the telescopic rod 11 away from the first spring 10 is rotatably connected with a connecting block 12. The side of the connecting block 12 away from the telescopic rod 11 is fixedly connected to the surface of the connecting rod 6.

[0025] The chain is sleeved on the surface of the sprocket body 2, and the chain is also arranged at the upper and lower ends of the auxiliary sprocket 7. The first spring 10 pushes the telescopic rod 11 to the upper and lower ends, and the telescopic rod 11 then pushes the connecting rod 6 and the auxiliary sprocket 7 to the two ends through the connecting block 12. The auxiliary sprocket 7 then props up the chain to both ends. By setting up the auxiliary structure 8, the auxiliary sprockets 7 at both ends can be propped up to the upper and lower ends. Spreading the chain can reduce the shaking and jumping of the chain during the transmission process, maintain the stability of the transmission, reduce energy loss, prevent derailment, and at the same time increase the contact area between the chain and the sprocket, increase friction, and help improve transmission efficiency.

[0026] The upper and lower ends of the protective shell 1 are fixedly connected with a fixing sleeve 16, the interior of the fixing sleeve 16 is fixedly connected with a second sleeve 17, a second spring 18 is arranged inside the second sleeve 17, one end of the second spring 18 is fixedly connected to the inner wall of the second sleeve 17, the other end of the second spring 18 is fixedly connected with a telescopic block 19, the end of the telescopic block 19 passes through the second sleeve 17 and is fixedly connected with a connecting frame 20, the interior of the connecting frame 20 is rotatably connected with a pulley 21, and the pulley 21 limits the chain.

[0027] The second spring 18 pushes the telescopic block 19 toward each other, and the telescopic block 19 drives the pulley 21 through the connecting frame 20. The pulley 21 limits the chain and makes the chain close to the sprocket body 2. By setting the second spring 18 and the pulley 21, the chain can be pressed against the surface of the sprocket to reduce the relative sliding between the chain and the sprocket, which helps to improve the transmission efficiency and reduce energy loss. At the same time, the pulley 21 can limit the chain to prevent the chain from shaking left and right, keep the chain moving in the correct position, reduce the friction between the chain and other components, and reduce energy loss.

[0028] How to use: The structure is installed through the mounting plate, the chain is set on the surface of the sprocket body 2, and the chain is also set at the upper and lower ends of the auxiliary sprocket 7. The first spring 10 pushes the telescopic rod 11 to the upper and lower ends, and the telescopic rod 11 then pushes the connecting rod 6 and the auxiliary sprocket 7 to both ends through the connecting block 12, and the auxiliary sprocket 7 then props up the chain to both ends.

[0029] At the same time, the second spring 18 pushes the telescopic block 19 in the opposite direction, and the telescopic block 19 drives the pulley 21 through the connecting frame 20. The pulley 21 limits the chain and makes the chain close to the sprocket body 2.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chain-off-preventing sprocket, comprising a protective shell (1) and a sprocket body (2), characterized in that: The sprocket body (2) is arranged inside the protective shell (1); a connecting disc (3) is fixedly connected to the rear surface of the protective shell (1); a mounting plate is fixedly connected to the upper end of the connecting disc (3); a rotating shaft (4) is rotatably connected to the center position of the surface of the connecting disc (3); an end of the rotating shaft (4) passes through the protective shell (1) and is rotatably connected to the inner wall of the protective shell (1); the surface of the rotating shaft (4) is fixedly connected to the sprocket body (2); upper and lower ends of the rear surface of the connecting disc (3) are rotatably connected to the first connecting shaft (5); a connecting rod (6) is fixedly connected to the surface of the first connecting shaft (5); an auxiliary sprocket (7) is arranged at one end of the connecting rod (6) away from the first connecting shaft (5); an auxiliary structure (8) is arranged between the connecting rods (6); the auxiliary structure (8) lifts the auxiliary sprocket (7) toward both ends; and the auxiliary sprocket (7) supports the chain toward the upper and lower ends.

2. The anti-chain-off sprocket according to claim 1, characterized in that: The auxiliary structure (8) comprises a first sleeve (9) and a first spring (10); the first spring (10) is arranged on the inner wall of the first sleeve (9); and both ends of the first spring (10) are fixedly connected to telescopic rods (11).

3. A chain-off-preventing sprocket according to claim 2, characterized in that: One end of the telescopic rod (11) away from the first spring (10) is rotatably connected to a connecting block (12), and a surface of the connecting block (12) away from the telescopic rod (11) is fixedly connected to the surface of the connecting rod (6).

4. The anti-chain-off sprocket according to claim 1, characterized in that: The end of the connecting rod (6) is fixedly connected to a fixing plate (13), a limiting block (14) is arranged on one side of the fixing plate (13), and the auxiliary sprocket (7) is arranged on the other side of the fixing plate (13).

5. The chain-off-preventing sprocket according to claim 4, characterized in that: A second connecting shaft (15) is fixedly connected between the limit block (14) and the auxiliary sprocket (7), and the second connecting shaft (15) passes through the fixed plate (13) and is rotatably connected to the fixed plate (13).

6. The chain sprocket for preventing chain from falling off according to claim 1, characterized in that: The upper and lower ends of the protective shell (1) are fixedly connected to a fixing sleeve (16), the interior of the fixing sleeve (16) is fixedly connected to a second sleeve (17), and the interior of the second sleeve (17) is provided with a second spring (18).

7. The chain sprocket for preventing chain from falling off according to claim 6, characterized in that: One end of the second spring (18) is fixedly connected to the inner wall of the second sleeve (17), and the other end of the second spring (18) is fixedly connected to a telescopic block (19).

8. The chain-off-preventing sprocket according to claim 7, characterized in that: The end of the telescopic block (19) passes through the second sleeve (17) and is fixedly connected to a connecting frame (20). The interior of the connecting frame (20) is rotatably connected to a pulley (21), and the pulley (21) limits the chain.

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