CN110630706A - A self-adaptive tensioning sprocket - Google Patents

Abstract

The invention discloses a self-adaptive tension chain wheel, which is used for solving the technical problems that a chain wheel mechanism in the prior art does not have a self-adaptive function, cannot effectively ensure that certain radial force is generated when the chain wheel is hobbed, and cannot independently face the occurrence of tooth jumping phenomenon caused by generating impact and vibration until the chain pitch is increased, and is elastically connected with the middle wheel, any one chain wheel hobbing can generate an elastic force, the chain wheel hobbing moves along a preset direction under the action of the elastic force and is contacted with two corresponding meshing teeth to tension the toothed chain, the self-adaptive tensioning chain wheel has a self-adaptive function, can effectively reduce the impact and vibration when the chain is meshed with the chain wheel, and reduces the probability of the occurrence of the tooth jumping phenomenon.

Description

A self-adaptive tensioning sprocket

technical field

The invention relates to the technical field of mechanical transmission equipment, in particular to an adaptive tensioning sprocket.

Background technique

Under the current trend, mechanical transmission equipment is widely used in industrial production. Among them, take the chain transmission as an example. The chain transmission is a kind of flexible transmission, which relies on the meshing of the sprocket teeth and the chain link to transmit motion and power. The specific characteristics are compact structure, high reliability, and suitable for various industrial work The environmental requirements are low, especially for mechanical equipment with a large center distance. Therefore, chain drives are widely used in automobiles, motorcycles, construction machinery and some conveying devices.

In the prior art, due to wear and tear of the chain, the pitch of the chain will increase. At this time, the meshing of the chain and the sprocket will generate greater impact and vibration, and in severe cases, tooth skipping will also occur. At present, the method for solving the above-mentioned impact vibration is mostly to arrange tensioning wheels, but it still cannot solve the impact and vibration caused by the change of the chain pitch after the chain is worn.

Based on the above, it is necessary to propose an adaptive tensioning sprocket, which is different from the tensioning method of arranging the tensioning wheel, so as to maintain a certain radial force on the hobbing of the sprocket at all times, so as to maintain the tension of the chain at all times. Tight, so that the sprocket and the chain can always maintain the best state of meshing, which significantly reduces the impact and vibration when the chain and the sprocket mesh, and avoids the phenomenon of tooth skipping caused by the increase of the chain pitch after the chain is worn.

Contents of the invention

The purpose of the present invention is to solve the problem that the sprocket mechanism in the above-mentioned background technology does not have self-adaptive function, and cannot effectively guarantee a certain radial force on the sprocket hobbing moment, and cannot face shocks and vibrations alone until the chain pitch increases. Large lead to technical problems such as jumping phenomenon, and provide an adaptive tension chain.

An adaptive tensioning sprocket, which is used to drive and connect a toothed chain, comprising:

Two sets of sprocket side plates;

an intermediate wheel, which is installed between the two sets of sprocket side plates, and has the same center of circle as the two sets of sprocket side plates;

A plurality of rotatable sprocket hobs, a plurality of sprocket hobs are evenly arranged in the radial direction of the intermediate wheel, and are elastically connected to the intermediate wheel, and any one of the sprocket The hobbing can generate an elastic force, and the elastic force can make the hobbing of the sprocket move to change its distance from the center of the circle;

A plurality of meshing spaces, one meshing space is between any two adjacent meshing teeth of the toothed chain, and the sprocket hob can be located in the corresponding meshing space to realize the tooth shape a chain forms a meshing connection with said intermediate wheel;

Wherein, the sprocket rollers move along a preset direction under the action of the elastic force, and contact with the corresponding two meshing teeth to tension the toothed chain; or the sprocket rollers Under the action of the elastic force, the teeth move along the preset direction to a limit position, and when in the limit position, the sprocket hobbing teeth can tension the toothed chain.

Preferably, the sprocket side plate is provided with:

A plurality of sliding grooves of the rolling pin bracket, the plurality of sliding grooves of the rolling pin bracket are evenly arranged along the circumferential direction of the sprocket side plate;

Wherein, the plurality of rolling pin bracket sliding grooves on the two groups of sprocket side plates are arranged in one-to-one correspondence, and one of the sprocket rollers is arranged between the two rolling pin bracket sliding grooves arranged in one-to-one correspondence. tooth.

The self-adaptive tensioning sprocket according to claim, characterized in that, the sliding groove of the rolling pin bracket is configured as a rectangle, and its length is arranged along the radial direction of the sprocket side plate;

Wherein, the preset direction is the length direction of the sliding groove of the rolling pin bracket.

Preferably, it also includes:

Spring positioning grooves, a plurality of spring positioning grooves are evenly opened in the radial direction of the intermediate wheel, and the spring positioning grooves are set in one-to-one correspondence with the hobbing teeth of the sprocket.

Preferably, it also includes:

a spring, the spring is used to generate the elastic force;

Wherein, any one of the spring positioning grooves is fixed with the first end of the spring; and a rolling pin bracket, which includes:

a frame body, which is fixedly connected to the second end of the spring;

Two moving ends, the middle part of the frame body forms a hollow area, and the hollow area separates the frame body into two moving ends;

Wherein, the two moving ends can be respectively placed in the sliding grooves of the rolling pin brackets that are not on the same sprocket side plate.

Preferably, the two moving ends are respectively provided with pin holes;

a sprocket roller pin transitionally fitted with two of said pin holes;

Wherein, the sprocket rolling pin is rotatably connected with the sprocket hobbing, and the sprocket hobbing part is located in the hollow area;

Wherein, the sprocket rolling pin is configured as a rolling pin whose two ends have the same diameter and are smaller than the diameter of the middle end.

Preferably, the length of the moving end is less than the length of the sliding groove of the rolling pin bracket;

Wherein, when the hobbing teeth of the sprocket can tension the toothed chain and form the limit position, the difference between the length of the moving end and the sliding groove of the rolling pin bracket is one-third of the length of the moving end one.

Specifically, the radius of the sprocket side plate is larger than the radius of the intermediate wheel;

When the toothed chain is meshed with the intermediate wheel, the toothed chain forms a virtual arc-shaped trajectory, and the radius of the virtual arc-shaped trajectory is equal to the radius of the sprocket side plate.

Specifically, a plurality of one-to-one corresponding bolt holes are provided on the surface of the sprocket side plate and the intermediate wheel;

Wherein, on the surface of the sprocket side plate or the intermediate wheel, two adjacent bolt holes are arranged in 60-degree rotational symmetry;

Wherein, the bolt holes are used for setting fastening components to install the two sets of sprocket side plates and the intermediate wheels together;

The fastening components are bolts, nuts and washers.

Specifically, the distance from the center of the plurality of bolt holes opened on the surface of the sprocket side plate to the center of the sprocket side plate is equal to half the radius of the sprocket side plate.

Beneficial effects of the present invention:

First, the self-adaptive tensioning sprocket proposed by the present invention has self-adaptive function, novel structure, convenient disassembly, adjustable range of initial tension force, and can maintain the best meshing state with the chain at all times, which can effectively reduce the The impact and vibration when the chain and the sprocket are meshed, thereby reducing the probability of tooth jumping, broadening the types of tensioning devices, and providing more options for chain transmission mechanisms in mechanical transmission equipment.

Second, the initial preset and limit positions of the tension force are realized through the sliding groove of the rolling pin bracket. The function of the sliding groove of the rolling pin bracket is to adjust the length of the pitch of the toothed chain, and the spring positioning groove can provide support for the spring. , to ensure stability.

Thirdly, the spring produces an elastic force to act on the frame so that the two mobile ends slide in the corresponding sliding grooves of the rolling pin brackets. The sliding grooves of the rolling pin brackets limit the moving direction of the moving ends and can also limit the maximum moving distance of the moving ends.

Fourth, in this embodiment, the sprocket rolling pin is rotatably connected with the sprocket hobbing to realize that the sprocket hobbing is rotatable, and the toothed chain and the wheel hobbing are equivalent to continuous rolling belt sliding, which further reduces the chain drive Friction, wear between medium-toothed chain and adaptive tensioning sprocket.

Fifth, the sprocket hobbing, sprocket rolling pin, rolling pin bracket and the two moving ends can float within a certain tension range along the radial direction of the intermediate wheel, and there will be no tensioning effect due to the spring being unforced Phenomenon.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the axonometric view of a kind of adaptive tensioning sprocket provided by the present invention;

Fig. 2 is the front view of an adaptive tensioning sprocket provided by the present invention;

Fig. 3 is a top view of an adaptive tensioning sprocket provided by the present invention;

Fig. 4 is an axonometric view after removing a group of sprocket side plates of an adaptive tensioning sprocket provided by the present invention;

Fig. 5 is a schematic diagram of a sprocket hobbing arrangement of an adaptive tensioning sprocket provided by the present invention;

Fig. 6 is an axonometric view of a rolling pin bracket of an adaptive tensioning sprocket provided by the present invention and sprocket hobbing;

Fig. 7 is an axonometric view of a fastening assembly of an adaptive tensioning sprocket provided by the present invention;

Fig. 8 is a perspective view of a sprocket rolling pin of an adaptive tensioning sprocket provided by the present invention.

The reference signs in the figure represent:

Sprocket side plate 10, intermediate wheel 20, sprocket hobbing 30, meshing space 40;

Rolling pin bracket sliding groove 110, spring positioning groove 210, spring 310, rolling pin bracket 320;

Frame body 321, moving end 322, hollow area 323, pin hole 324, sprocket rolling pin 340;

Bolt hole 123, bolt 1, nut 2, washer 3.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention proposes that an adaptive tensioning sprocket needs to have an adaptive function, and the adaptive function is realized by being integrated in itself, and does not involve additional attachments other than it, and can be used independently; its adaptive function can be understood as : Ensure that there is a certain radial force on the sprocket hobbing 30 at all times, so that it can mesh with the toothed chain 100 and form tension, and then realize the problem of tooth skipping caused by large impact and vibration until the chain pitch increases A technical problem occurs.

Specifically, referring to accompanying drawing 4, and referring to accompanying drawings 1-3, the self-adaptive tensioning sprocket is used to drive and connect the toothed chain 100, and the self-adapting tensioning sprocket includes two sets of sprocket side plates 10. The intermediate wheel 20 is installed between the two sets of sprocket side plates 10, and the intermediate wheel 20 has the same circle center as the two sets of sprocket side plates 10; the above is the structure made by the self-adaptive tensioning sprocket to realize its function design.

A plurality of rotatable sprocket hobs 30, the rotating sprocket hobs 30 can reduce wear and prolong the service life; a plurality of sprocket hobs 30 are evenly arranged in the radial direction of the intermediate wheel 20, and a plurality of The sprocket hob 30 is elastically connected to the intermediate wheel 20, and any one of the sprocket hobs 30 can generate an elastic force, and the elastic force can make the sprocket hob 30 move to change its distance from the center of the circle; it can be understood The purpose is to realize that radial force can act at any moment, and the present invention is realized by designing a plurality of sprocket hobbing teeth 30 .

A plurality of meshing spaces 40, one meshing space 40 is between any two adjacent meshing teeth of the toothed chain 100, and the sprocket hob 30 can be located in the corresponding meshing space 40, so as to realize the toothed chain 100 and the intermediate wheel 20 forms a meshing connection to realize driving motion and power transmission.

Wherein, the sprocket hob 30 moves along a preset direction under the action of elastic force, and contacts with two corresponding meshing teeth to tension the toothed chain 100; It has tension; it can be understood that under the action of the elastic force, forming tension can provide a floating range;

Alternatively, the range of the tension force can be adjusted in the initial state through a certain restriction, so that the sprocket hob 30 can move to a limit position in a predetermined direction under the action of the elastic force, and at the limit position , the extreme position is equivalent to the restriction on the tension force, and it is necessary to ensure that the sprocket hob 30 can tension the toothed chain 100, so as to achieve the purpose of the present invention.

In a specific embodiment, please refer to the accompanying drawing 1, the sprocket side plate 10 is provided with: a plurality of rolling pin bracket sliding grooves 110, and a plurality of rolling pin bracket sliding grooves 110 are arranged along the circumference of the sprocket side plate 10 The direction is evenly arranged; among them, the multiple rolling pin bracket sliding grooves 110 on the two groups of sprocket side plates 10 are arranged in one-to-one correspondence, and one correspondingly is arranged between the two rolling pin bracket sliding grooves 110 arranged in one-to-one correspondence. Sprocket gear hobbing 30; specifically, in order to better reduce impact and vibration, one-to-one uniform arrangement is a method used in the design of the present invention, so that the components can be more evenly stressed when they are stressed.

Please refer to the accompanying drawing 1, the rolling pin bracket sliding groove 110 is configured as a rectangle, and its length is arranged along the radial direction of the sprocket side plate 10; wherein, the preset direction is the length direction of the rolling pin bracket sliding groove 110; It can be understood that the above-mentioned floating range, the initial preset and limit position of the tension force are all realized by the sliding groove 110 of the rolling pin bracket, and the function of the sliding groove 110 of the rolling pin bracket is to adjust the length of the chain pitch of the toothed chain 100 , and realize its function through the cooperation of the following components.

Please refer to accompanying drawing 4, also include: spring positioning groove 210, the radial direction of intermediate wheel 20 is evenly provided with a plurality of spring positioning grooves 210, and spring positioning groove 210 is provided with sprocket hobbing 30 one by one correspondence, spring positioning The groove 210 can provide support for the spring 310 to ensure stability.

See accompanying drawing 5, shown in 6, also include: spring 310, spring 310 is in order to generate elastic force; Wherein, the first end of spring 310 is fixed in any spring positioning groove 210; And rolling pin support 320 , the rolling pin bracket 320 includes: a frame body 321, which is fixedly connected to the second end of the spring 310; The moving ends 322 ; wherein, the two moving ends 322 can be respectively placed in the corresponding sliding slots 110 of the rolling pin brackets that are not in the same sprocket side plate 10 . The rolling pin bracket 320 transmits the elastic force generated by the spring 310. Specifically, the direction of the elastic force is the radial direction of the intermediate wheel. Specifically, the way of moving along the preset direction is realized by designing two moving ends 322. The specific working principle For, the spring 310 produces an elastic force to act on the frame body 321, so that the two moving ends 322 slide in the corresponding rolling pin bracket sliding grooves 110, and the rolling pin bracket sliding grooves 110 limit the moving direction of the moving ends 322, and can also limit the movement end 322 maximum travel distance.

Please refer to the accompanying drawing 6, the two moving ends 322 are respectively provided with pin holes 324; the sprocket rolling pin 340 is transitionally fitted with the two pin holes 324; connected, and the sprocket roller 30 is partially located in the hollow area 323; wherein, the sprocket roller pin 340 is configured as a roller pin whose diameter at both ends is equal and smaller than the diameter of the middle end; specifically, in this embodiment, the sprocket roller Pin 340 is rotatably connected with sprocket hob 30 to realize that sprocket hob 30 is rotatable, and toothed chain 100 and wheel hob 30 are equivalent to continuous rolling belt sliding, which further reduces the contact between toothed chain 100 and self in chain transmission. Adapt to the friction and wear between the tensioning sprockets, thereby reducing the probability of tooth skipping.

In a more preferred embodiment, please refer to Figure 1, the length of the moving end 322 is less than the length of the rolling pin bracket sliding groove 110; At the extreme position, the difference between the length of the moving end 322 and the sliding groove 110 of the rolling pin bracket is one-third of the length of the moving end 322 . This embodiment enables the sprocket roller teeth 30, the sprocket roller pin 340, the roller pin bracket 320 and the two moving ends 322 to float within a certain tension range along the radial direction of the intermediate wheel 20, and the spring 310 will not be unstressed. There is no tension effect; in this embodiment, the difference between the length of the moving end 322 and the sliding groove 110 of the rolling pin bracket is about one-third of the length of the moving end 322, specifically, in this technology In the scheme, the difference between the length of the moving end 322 and the sliding groove 110 of the rolling pin bracket is a preferred embodiment of one-third of the length of the moving end 322; A set of technical parameters of the size, specifically:

The diameter of the sprocket side plate 10 is 116mm, and the circumference diameter of the intermediate wheel 20 is 90mm. At this time, the difference between the length of the moving end 322 and the sliding groove 110 of the rolling pin bracket is between 5mm and 8mm.

In a more preferred embodiment, see accompanying drawing 4 shown, the radius of sprocket side plate 10 is greater than the radius of intermediate wheel 20; A virtual arc-shaped trajectory, the radius of the virtual arc-shaped trajectory is equal to the radius of the sprocket side plate 10; it is equivalent to that the edge of the sprocket side plate 10 can be nearly flush with the back of the toothed chain 101 to limit the toothed chain 100 Axial play during movement.

Referring to accompanying drawings 2 and 1, the surfaces of the sprocket side plate 10 and the intermediate wheel 20 are provided with a plurality of one-to-one corresponding bolt holes 123; The two adjacent bolt holes 123 are arranged in a 60-degree rotational symmetry; wherein, the bolt holes 123 are used to set fastening components to install the two sets of sprocket side plates 10 and the intermediate wheel 20 together; the fastening components are bolts 1, nuts 2 and gasket 3.

Please refer to accompanying drawings 2 and 1, the distance from the center of circles of a plurality of bolt holes 123 provided on the surface of the sprocket side plate 10 to the center of the sprocket side plate 10 is equal to 1/2 of the radius of the sprocket side plate 10; In this way, the purpose of fastening between the sprocket side plate 10 and the intermediate wheel 20 can be achieved, and the strength of the sprocket side plate 10 can be ensured to a certain extent.

Based on the above, the present invention can be used independently, the sprocket rolling pin 340 and the rolling pin bracket 320 are equivalent to a whole body to move, and the sprocket rolling pin 30 and the sprocket rolling pin 340 are relatively rotating. When the toothed chain 100 initially has a certain tension, the center distance between the driving and driven sprockets is predetermined. Even after the toothed chain 100 is damaged, the chain pitch increases, and the self-adaptive tensioning sprocket can reflect its own tension. Adapt the edge to achieve tension.

Based on the above, the technical solution has the following characteristics:

First, the self-adaptive tensioning sprocket proposed by the present invention has self-adaptive function, novel structure, convenient disassembly, adjustable range of initial tension force, and can maintain the best meshing state with the chain at all times, which can effectively reduce the The impact and vibration when the chain and the sprocket are meshed, thereby reducing the probability of tooth jumping, broadening the types of tensioning devices, and providing more options for chain transmission mechanisms in mechanical transmission equipment.

Second, the preset and limit positions of the tension force at the initial stage are all realized by the rolling pin bracket sliding groove 110. The effect of the rolling pin bracket sliding groove 110 is to adjust the length of the chain pitch of the toothed chain 100, and the spring positioning groove 210 can Provide support for the spring 310 to ensure stability.

Third, the spring 310 produces an elastic force to act on the frame body 321, so that the two moving ends 322 slide in the corresponding rolling pin bracket sliding grooves 110, and the rolling pin bracket sliding grooves 110 limit the moving direction of the moving ends 322, and can also limit The maximum moving distance of the mobile terminal 322 .

Fourth, in this embodiment, the sprocket rolling pin 340 is rotatably connected with the sprocket hob 30 to realize that the sprocket hob 30 is rotatable, and the toothed chain 100 and the wheel hob 30 are equivalent to rolling and sliding. The friction and wear between the toothed chain 100 and the self-adaptive tensioning sprocket in the chain transmission are further reduced.

Fifth, the sprocket hobbing 30, the sprocket rolling pin 340, the rolling pin bracket 320, and the two moving ends 322 can float within a certain tension range along the radial direction of the intermediate wheel 20, and there will be no spring failure due to no force. to the phenomenon of tension.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

1. An adaptive tensioning sprocket, which is used to drive and connect the toothed chain (100), is characterized in that: comprising: Two sets of sprocket side plates (10); an intermediate wheel (20), which is installed between the two groups of sprocket side plates (10), and has the same center of circle as the two groups of sprocket side plates (10); A plurality of rotatable sprocket hobs (30), the plurality of sprocket hobs (30) are evenly arranged in the radial direction of the intermediate wheel (20), and can be elastically connected to the intermediate wheel (20) connection, and any one of the sprocket teeth (30) can generate an elastic force, and the elastic force can make the sprocket teeth (30) move to change its distance from the center of the circle; A plurality of meshing spaces (40), one meshing space (40) is between any two adjacent meshing teeth of the toothed chain (100), and the sprocket rolling teeth (30) can be located in the corresponding in the meshing space (40), so as to realize the meshing connection between the toothed chain (100) and the intermediate wheel (20); Wherein, the sprocket rolling teeth (30) move along a preset direction under the action of the elastic force, and contact with the two corresponding meshing teeth, so as to tension the toothed chain (100); Or the sprocket roller (30) moves to a limit position along the preset direction under the action of the elastic force, and when at the limit position, the sprocket roller (30) can be tensioned The toothed chain (100). 2. The self-adaptive tensioning sprocket according to claim 1, characterized in that: the sprocket side plate (10) is provided with: A plurality of rolling pin bracket sliding grooves (110), the plurality of rolling pin bracket sliding grooves (110) are evenly arranged along the circumferential direction of the sprocket side plate (10); Wherein, the plurality of rolling pin bracket sliding grooves (110) on the sprocket side plates (10) of the two groups are arranged in one-to-one correspondence, and between the two rolling pin bracket sliding grooves (110) arranged in one-to-one correspondence One sprocket hob (30) is correspondingly arranged between them. 3. The self-adaptive tensioning sprocket according to claim 2, characterized in that: the sliding groove (110) of the rolling pin bracket is configured as a rectangle, and its length is along the diameter of the sprocket side plate (10). Arrange in the direction; Wherein, the preset direction is the length direction of the sliding groove (110) of the rolling pin bracket. 4. The self-adaptive tensioning sprocket according to claim 3, characterized in that: it also includes: Spring positioning grooves (210), the radial direction of the intermediate wheel (20) is uniformly provided with a plurality of spring positioning grooves (210), and the spring positioning grooves (210) correspond to the sprocket hobbing teeth (30) one by one set up. 5. The self-adaptive tensioning sprocket according to claim 4, characterized in that: it also includes: a spring (310), the spring (310) is used to generate the elastic force; Wherein, the first end of the spring (310) is fixed in any one of the spring positioning grooves (210); and the rolling pin bracket (320), which includes: a frame body (321), which is fixedly connected to the second end of the spring (310); Two moving ends (322), the middle part of the frame body (321) forms a hollow area (323), and the hollow area (323) separates the frame body (321) into two moving ends (322) ; Wherein, the two moving ends (322) can be respectively placed in the corresponding sliding grooves (110) of the rolling pin bracket (110) that are not on the same sprocket side plate (10). 6. The self-adaptive tensioning sprocket according to claim 5, characterized in that: the two moving ends (322) are respectively provided with pin holes (324); a sprocket roller pin (340) transition fit with the two said pin holes (324); Wherein, the sprocket rolling pin (340) is rotationally connected with the sprocket rolling tooth (30), and the sprocket rolling tooth (30) is partially located in the hollow area (323); Wherein, the sprocket rolling pin (340) is configured as a rolling pin with the same diameter at both ends and smaller than the diameter at the middle end. 7. The self-adaptive tensioning sprocket according to claim 5, characterized in that: the length of the moving end (322) is less than the length of the sliding groove (110) of the rolling pin bracket; Wherein, when the sprocket rolling teeth (30) can tension the toothed chain (100) and form the limit position, the sliding groove (110) of the moving end (322) and the rolling pin bracket The difference in length is one-third of the length of the moving end (322). 8. The self-adaptive tensioning sprocket according to any one of claims 1-7, characterized in that: the radius of the sprocket side plate (10) is greater than the radius of the intermediate wheel (20); When the toothed chain (100) is meshed with the intermediate wheel (20), the toothed chain (100) forms a virtual arc-shaped trajectory, and the radius of the virtual arc-shaped trajectory is equal to that of the chain The radius of the wheel side plate (10). 9. The self-adaptive tensioning sprocket according to claim 8, characterized in that: the surfaces of the sprocket side plate (10) and the intermediate wheel (20) are provided with a plurality of one-to-one corresponding bolt holes ( 123); Wherein, on the surface of the sprocket side plate (10) or the intermediate wheel (20), two adjacent bolt holes (123) are arranged in 60-degree rotational symmetry; Wherein, the bolt holes (123) are used for setting fastening components to install two sets of the sprocket side plates (10) and the intermediate wheels (20) together; The fastening components are bolts (1), nuts (2) and washers (3). 10. The self-adaptive tensioning sprocket according to claim 9, characterized in that: the center of the plurality of bolt holes (123) opened on the surface of the sprocket side plate (10) reaches the sprocket The distance between the centers of the side plates (10) is equal to one-half of the radius of the sprocket side plates (10).

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