阅读说明：本技术 一种自适应张紧链轮 (Self-adaptive tension sprocket ) 是由 程亚兵 陈晓敏 李超 陈璐翔 牛家兴 李阳 李新月 朱凯宏 葛平玉 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种自适应张紧链轮,用以解决现有技术中的链轮机构不具有自适应功能,无法有效保证对链轮滚齿时刻有一定的径向力,无法单独面对产生冲击、振动直至链节距增大导致跳齿现象发生的技术问题,具体包括两组链轮侧板,中间轮安装在两组链轮侧板之间,多个可转动的链轮滚齿,均匀地布置在中间轮的径向,且与中间轮可弹性的连接,且任一一个链轮滚齿可产生一弹性力,链轮滚齿在弹性力的作用下沿一预设方向移动,并与其对应的两个啮合齿接触,以张紧齿形链,该自适应张紧链轮具有自适应功能,能够有效减轻链条和链轮啮合时的冲击、振动,减低跳齿现象发生的几率。(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.)

1. An adaptive tensioning sprocket for drivingly connecting a toothed chain (100), characterized by: the method comprises the following steps:

two sets of sprocket side plates (10);

the middle wheel (20) is arranged between the two groups of chain wheel side plates (10) and has the same circle center with the two groups of chain wheel side plates (10);

a plurality of rotatable sprocket hobbing teeth (30), a plurality of the sprocket hobbing teeth (30) are uniformly arranged in the radial direction of the intermediate wheel (20) and can be elastically connected with the intermediate wheel (20), and any one sprocket hobbing tooth (30) can generate an elastic force which can enable the sprocket hobbing teeth (30) to move to change the distance between the sprocket hobbing teeth and the circle center;

a plurality of meshing spaces (40), one meshing space (40) is arranged between any two adjacent meshing teeth of the toothed chain (100), and the sprocket hobbing (30) can be positioned in the corresponding meshing space (40) so as to realize that the toothed chain (100) is meshed and connected with the intermediate wheel (20);

wherein the sprocket hobbing (30) moves along a preset direction under the action of the elastic force and is in contact with two corresponding meshing teeth to tension the toothed chain (100); or the chain wheel hobbing (30) moves along the preset direction under the action of the elastic force to reach an extreme position, and when the extreme position is reached, the chain wheel hobbing (30) can tension the toothed chain (100).

2. The adaptive tensioning sprocket as defined in claim 1, wherein: the chain wheel side plate (10) is provided with:

a plurality of roller pin bracket sliding grooves (110), the plurality of roller pin bracket sliding grooves (110) being uniformly arranged in a circumferential direction of the sprocket side plate (10);

the plurality of rolling pin support sliding grooves (110) on the two groups of chain wheel side plates (10) are arranged in a one-to-one corresponding mode, and one chain wheel hobbing (30) is correspondingly arranged between the two rolling pin support sliding grooves (110) which are arranged in a one-to-one corresponding mode.

3. The adaptive tensioning sprocket as defined in claim 2, wherein: the roller pin bracket sliding groove (110) is configured in a rectangular shape, and the length thereof is arranged in the radial direction of the sprocket side plate (10);

wherein the preset direction is the length direction of the rolling pin support sliding groove (110).

4. The adaptive tensioning sprocket as defined in claim 3, wherein: also includes:

spring constant head tank (210), the radial of intermediate wheel (20) has evenly seted up a plurality ofly spring constant head tank (210), spring constant head tank (210) and sprocket hobbing (30) one-to-one set up.

5. The adaptive tensioning sprocket as defined in claim 4, wherein: also includes:

a spring (310), the spring (310) to generate the elastic force;

wherein, a first end of the spring (310) is fixed in any one of the spring positioning grooves (210); and a roll pin bracket (320) comprising:

a frame body (321) fixedly connected with the second end of the spring (310);

two moving ends (322), wherein a hollow area (323) is formed in the middle of the frame body (321), and the hollow area (323) enables the frame body (321) to be divided into the two moving ends (322);

wherein the two moving ends (322) can be respectively placed in the corresponding rolling pin support sliding grooves (110) of the chain wheel side plate (10) which is not the same.

6. The adaptive tensioning sprocket as defined in claim 5, wherein: the two moving ends (322) are respectively provided with a pin hole (324);

a sprocket roll pin (340) transition fitted with both of the pin holes (324);

wherein the sprocket roller pin (340) is rotationally connected with the sprocket roller (30), and the sprocket roller (30) is partially positioned in the hollow area (323);

wherein the sprocket roller pin (340) is configured as a roller pin with both ends of equal diameter and smaller than the diameter of the middle end.

7. The adaptive tensioning sprocket as defined in claim 5, wherein: the length of the moving end (322) is less than that of the rolling pin bracket sliding groove (110);

wherein, when the sprocket hobbing (30) can tension the tooth-shaped chain (100) and forms the limit position, the difference between the length of the moving end (322) and the length of the roll pin support sliding groove (110) is one third of the length of the moving end (322).

8. The adaptive tensioning sprocket as defined in any one of claims 1 to 7, wherein: the radius of the chain wheel side plate (10) is larger than that of the middle wheel (20);

when the toothed chain (100) is meshed with the middle wheel (20), the toothed chain (100) forms a virtual arc track, and the radius of the virtual arc track is equal to that of the chain wheel side plate (10).

9. The adaptive tensioning sprocket as defined in claim 8, wherein: the surfaces of the chain wheel side plate (10) and the middle wheel (20) are provided with a plurality of bolt holes (123) which correspond to each other one by one;

wherein two adjacent bolt holes (123) are arranged in 60-degree rotational symmetry on the surface of the sprocket side plate (10) or the intermediate wheel (20);

wherein the bolt holes (123) are used to provide a fastening assembly to mount the two sets of sprocket side plates (10) and the intermediate wheel (20) together;

the fastening components are bolts (1), nuts (2) and gaskets (3).

10. The adaptive tensioning sprocket as defined in claim 9, wherein: the distance from the circle centers of the plurality of bolt holes (123) formed in the surface of the chain wheel side plate (10) to the circle center of the chain wheel side plate (10) is equal to one half of the radius of the chain wheel side plate (10).

Technical Field

The invention relates to the technical field of mechanical transmission equipment, in particular to a self-adaptive tensioning chain wheel.

Background

Under the current trend, mechanical transmission equipment is widely applied to industrial production. The chain transmission is a flexible transmission, and transfers motion and power by means of the meshing between the teeth of the chain wheel and the chain links, and has the specific characteristics of compact structure, high reliability and low requirement on various industrial working environments, and can be particularly used in mechanical equipment with large center distance, so the chain transmission is widely applied to automobiles, motorcycles, engineering machinery and some conveying devices.

Disclosure of Invention

The invention aims to solve the technical problems that a chain wheel mechanism in the background technology does not have a self-adaptive function, cannot effectively ensure that a certain radial force is generated when a chain wheel rolls teeth, cannot independently face the phenomenon of tooth jumping caused by the generation of impact and vibration until the chain pitch is increased, and the like, and provide a self-adaptive tension chain.

An adaptive tensioning sprocket for drivingly connecting a toothed chain, comprising:

two sets of sprocket side plates;

the middle wheel is arranged between the two groups of chain wheel side plates and has the same circle center with the two groups of chain wheel side plates;

the plurality of rotatable chain wheel hobs are uniformly arranged in the radial direction of the middle wheel and can be elastically connected with the middle wheel, and any one chain wheel hob can generate an elastic force which can enable the chain wheel hobs to move so as to change the distance between the chain wheel hobs and the circle center;

the chain wheel hobbing can be positioned in the meshing space corresponding to the chain wheel hobbing so as to realize that the toothed chain is meshed with the middle wheel;

the chain wheel hobbing moves along a preset direction under the action of the elastic force and is in contact with two corresponding meshing teeth to tension the toothed chain; or the chain wheel hobbing moves to a limit position along the preset direction under the action of the elastic force, and the chain wheel hobbing can tension the toothed chain at the limit position.

Preferably, the sprocket side plate is provided with:

the plurality of rolling pin support sliding grooves are uniformly arranged along the circumferential direction of the chain wheel side plate;

the chain wheel side plates are arranged in a mode that a plurality of rolling pin support sliding grooves on the two groups of chain wheel side plates are arranged in a one-to-one corresponding mode, and the chain wheel hobbing is correspondingly arranged between the two rolling pin support sliding grooves which are arranged in a one-to-one corresponding mode.

The adaptive tension sprocket as recited in, wherein said roller pin bracket sliding groove is configured in a rectangular shape and a length thereof is arranged in a radial direction of said sprocket side plate;

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

Preferably, also include:

the spring positioning grooves are uniformly formed in the radial direction of the middle wheel and are arranged in one-to-one correspondence with the hobbing teeth of the chain wheel.

Preferably, also include:

a spring to generate the elastic force;

wherein, a first end of the spring is fixed in any one of the spring positioning grooves; and a roll pin bracket, comprising:

the frame body is fixedly connected with the second end of the spring;

the middle part of the frame body forms a hollow area which enables the frame body to be divided into two moving ends;

and the two moving ends can be respectively placed in the corresponding rolling pin support sliding grooves of the chain wheel side plates.

Preferably, two moving ends are respectively provided with a pin hole;

the chain wheel rolling pin is in transition fit with the two pin holes;

the chain wheel hobbing pin is rotationally connected with the chain wheel hobbing, and the chain wheel hobbing part is positioned in the hollow area;

wherein the sprocket roller pin is configured as a roller pin having both ends of equal diameter and smaller than a diameter of the middle end.

Preferably, the length of the moving end is smaller than that of the sliding groove of the roll pin bracket;

when the sprocket hobbing can tension the toothed chain and form the limit position, the length difference between the moving end and the sliding groove of the roll pin support is one third of the length of the moving end.

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 middle wheel, the toothed chain forms a virtual arc track, and the radius of the virtual arc track is equal to that of the chain wheel side plate.

Specifically, a plurality of bolt holes which correspond to one another are formed in the surfaces of the chain wheel side plate and the middle wheel;

wherein two adjacent bolt holes are arranged on the surface of the chain wheel side plate or the middle wheel in a 60-degree rotational symmetry manner;

wherein the bolt holes are used for arranging fastening assemblies to mount the two groups of the chain wheel side plates and the middle wheel together;

the fastening components are bolts, nuts and gaskets.

Specifically, the distance from the circle center of the plurality of bolt holes formed in the surface of the sprocket side plate to the circle center of the sprocket side plate is equal to one half of the radius of the sprocket side plate.

The invention has the beneficial effects that:

first, the self-adaptive tensioning chain wheel provided by the invention has a self-adaptive function, is novel in structure, is convenient to disassemble, has an adjustable initial tensioning force range, can constantly keep the optimal meshing state with a chain, and can effectively reduce the impact and vibration when the chain and the chain wheel are meshed, thereby reducing the probability of occurrence of a tooth jumping phenomenon, widening the types of tensioning devices and providing more choices for a chain transmission mechanism in mechanical transmission equipment.

Secondly, presetting and extreme position when initial to the tensile force all realize through rolling round pin support sliding tray, roll round pin support sliding tray effect and be the length of adjusting profile of tooth chain pitch, the spring constant head tank can provide the support for the spring, guarantees stability.

And thirdly, the spring generates elastic force action and the frame body, so that the two moving ends slide in the corresponding rolling pin support sliding grooves, the moving direction of the moving ends is limited by the rolling pin support sliding grooves, and the maximum moving distance of the moving ends can be limited.

Fourthly, in the embodiment, the chain wheel hobbing pin is rotationally connected with the chain wheel hobbing to realize that the chain wheel hobbing is rotatable, and the toothed chain and the wheel hobbing are equivalent to a continuous rolling belt to slide, so that the friction and the abrasion between the toothed chain and the self-adaptive tensioning chain wheel in chain transmission are further reduced.

Fifthly, the chain wheel hobbing, the chain wheel rolling pin, the rolling pin support and the two movable ends can float in a certain tensioning range along the radial direction of the middle wheel, and the phenomenon that the spring cannot be tensioned due to no stress is avoided.

Drawings

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

FIG. 1 is an isometric view of an adaptive tension sprocket provided by the present invention;

FIG. 2 is a front view of an adaptive tensioning sprocket according to the present invention;

FIG. 3 is a top view of an adaptive tensioning sprocket according to the present invention;

FIG. 4 is an isometric view of an adaptive tensioning sprocket shown without a set of sprocket side plates according to the present invention;

FIG. 5 is a schematic view of a sprocket hobbing arrangement for an adaptive tensioning sprocket provided by the present invention;

FIG. 6 is an isometric view of a roll pin support, sprocket hobbing, for an adaptive tensioning sprocket according to the present invention;

FIG. 7 is an isometric view of a fastener assembly of an adaptive tensioning sprocket according to the present invention;

fig. 8 is an isometric view of a sprocket roller pin of an adaptive tensioning sprocket according to the present invention.

The reference numerals in the figures denote:

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

a roll pin bracket sliding groove 110, a spring positioning groove 210, a spring 310, a roll pin bracket 320;

a frame body 321, a moving end 322, a hollow area 323, a pin hole 324 and a chain wheel rolling pin 340;

bolt hole 123, bolt 1, nut 2, gasket 3.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a self-adaptive tension chain wheel which needs to have a self-adaptive function, wherein the self-adaptive function is realized by being integrated on the self-adaptive tension chain wheel, and an additional auxiliary device except the self-adaptive function is not involved, so that the self-adaptive tension chain wheel can be independently used; the adaptive function of the method can be understood as follows: certain radial force is ensured to be applied to the sprocket hobbing 30 all the time, so that the sprocket hobbing can be meshed with the toothed chain 100 and form tensioning, and the technical problem of tooth jumping caused by large impact and vibration until the chain pitch is increased is solved.

Specifically, referring to fig. 4 in conjunction with fig. 1-3, the adaptive tension sprocket is used to drivingly connect a toothed chain 100, and the adaptive tension sprocket includes two sets of sprocket side plates 10; the middle wheel 20 is arranged between the two groups of chain wheel side plates 10, and the middle wheel 20 and the two groups of chain wheel side plates 10 have the same circle center; the above is the structural design of the adaptive tension sprocket to achieve its function.

The plurality of rotatable sprocket hobbing teeth 30, the rotatable sprocket hobbing teeth 30 can reduce abrasion when being meshed, and the service life is prolonged; the plurality of sprocket hobbing teeth 30 are uniformly arranged in the radial direction of the intermediate wheel 20, the plurality of sprocket hobbing teeth 30 can be elastically connected with the intermediate wheel 20, and any one sprocket hobbing tooth 30 can generate an elastic force which can enable the sprocket hobbing teeth 30 to move so as to change the distance between the sprocket hobbing teeth 30 and the circle center; it will be appreciated that the present invention is embodied by the design of a plurality of sprocket hobs 30 in order to achieve a moment to effect radial forces.

And a plurality of meshing spaces 40 are formed between any two adjacent meshing teeth of the toothed chain 100, and the sprocket hobbing 30 can be positioned in the corresponding meshing space 40 so as to realize that the toothed chain 100 is meshed and connected with the intermediate wheel 20 to realize driving motion and power transmission.

Wherein, the sprocket hobbing 30 moves along a preset direction under the action of the elastic force and contacts with two corresponding meshing teeth to tension the toothed chain 100; in this way, tensioning is realized, and the tensioning force can be ensured at any time; it is understood that the formation of tension under the action of the elastic force provides a floating range;

alternatively, the range of the tension force can be adjusted in the initial state by a certain limiting action, so that the sprocket hobbing 30 moves to a limit position along the preset direction under the action of the elastic force, and at the limit position, the limit position is equivalent to the limit of the tension force, and the sprocket hobbing 30 needs to be ensured to tension the toothed chain 100, thereby achieving the purpose of the invention.

In one embodiment, referring to fig. 1, the sprocket side plate 10 has: a plurality of roller pin bracket sliding grooves 110, the plurality of roller pin bracket sliding grooves 110 being uniformly arranged in the circumferential direction of the sprocket side plate 10; wherein, a plurality of rolling pin support sliding grooves 110 on two groups of chain wheel side plates 10 are correspondingly arranged one by one, and a chain wheel hobbing 30 is correspondingly arranged between two rolling pin support sliding grooves 110 which are correspondingly arranged one by one; specifically, in order to better show and reduce impact and vibration, the mode adopted in the design of the invention is uniformly arranged in a one-to-one correspondence manner, so that all parts can be more uniformly stressed.

Referring to fig. 1, the roller pin bracket sliding groove 110 is configured in a rectangular shape, and the length thereof is arranged in 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 will be appreciated that the above-mentioned floating range, initial presetting of the tension force and extreme positions are all achieved by the roller pin bracket sliding grooves 110, and the roller pin bracket sliding grooves 110 function to adjust the length of the chain pitch of the toothed chain 100 and achieve its function by cooperating the following components.

Referring to fig. 4, the method further includes: spring positioning groove 210, a plurality of spring positioning grooves 210 have evenly been seted up in the radial of intermediate wheel 20, and spring positioning groove 210 sets up with sprocket hobbing 30 one-to-one, and spring positioning groove 210 can provide the support for spring 310, guarantees stability.

Referring to fig. 5 and 6, the present invention further includes: a spring 310, the spring 310 being configured to generate an elastic force; wherein, a first end of the spring 310 is fixed in any one of the spring positioning slots 210; and a roll pin bracket 320, the roll pin bracket 320 including: a frame body 321 fixedly connected to the second end of the spring 310; two moving ends 322, a hollow area 323 is formed in the middle of the frame 321, and the hollow area 323 divides the frame 321 into the two moving ends 322; wherein, the two moving ends 322 can be respectively placed in the corresponding rolling pin support sliding grooves 110 of the chain wheel side plate 10. The roll pin support 320 transmits the elastic force generated by the spring 310, specifically, the direction of the elastic force is the radial direction of the middle wheel, specifically, the mode of moving along the preset direction is realized by designing two moving ends 322, the specific working principle is that the spring 310 generates the elastic force acting on the support body 321, so that the two moving ends 322 slide in the corresponding roll pin support sliding groove 110, the roll pin support sliding groove 110 limits the moving direction of the moving ends 322, and the maximum moving distance of the moving ends 322 can be limited.

Referring to fig. 6, two moving ends 322 are respectively provided with pin holes 324; a sprocket roll pin 340 that is transition fit with the two pin holes 324; wherein sprocket roller pin 340 is rotatably connected to sprocket roller 30, and sprocket roller 30 is partially located in hollow area 323; wherein the sprocket roller pin 340 is configured as a roller pin having both ends with equal diameters and smaller than the diameter of the middle end; specifically, in this embodiment, sprocket roller pin 340 is rotatably connected to sprocket roller 30 to realize that sprocket roller 30 is rotatable, and toothed chain 100 and wheel roller 30 are equivalent to a continuous rolling belt, so as to further reduce friction and wear between toothed chain 100 and the adaptive tension sprocket in chain transmission, thereby reducing the occurrence of tooth skipping.

In a more preferred embodiment, referring to FIG. 1, the length of the moving end 322 is less than the length of the roller pin bracket sliding slot 110; wherein, when the sprocket hobbing 30 can tension the tooth-shaped chain 100 and form the limit position, the difference between the length of the moving end 322 and the length of the pin support sliding groove 110 is one third of the length of the moving end 322. The embodiment enables the sprocket hobbing 30, the sprocket rolling pin 340, the rolling pin bracket 320 and the two moving ends 322 to float in a certain tensioning range along the radial direction of the middle wheel 20, and the phenomenon that the spring 310 cannot be tensioned due to no stress is avoided; in the present embodiment, the length difference between the moving end 322 and the roller pin support sliding groove 110 is about one third of the length of the moving end 322, specifically, the length difference between the moving end 322 and the roller pin support sliding groove 110 is one third of the length of the moving end 322 in the present embodiment; meanwhile, the self-adaptive tension chain wheel is proposed to be used as a set of technical parameters of specific application sizes, and specifically comprises the following steps:

the sprocket side plate 10 has a diameter of 116mm and the intermediate wheel 20 has a circumferential diameter of 90mm, and the difference between the length of the moving end 322 and the length of the roller pin holder sliding groove 110 is in the range of 5mm to 8 mm.

In a more preferred embodiment, and as shown in FIG. 4, the sprocket side plate 10 has a radius greater than the radius of the intermediate wheel 20; when the toothed chain 100 is meshed with the middle wheel 20, the toothed chain 100 forms a virtual arc track, and the radius of the virtual arc track is equal to that of the chain wheel side plate 10; corresponding to the sprocket side plate 10 edge can be nearly flush with the back of the toothed chain 101 to limit axial play of the toothed chain 100 during movement.

Referring to fig. 2 and 1, a plurality of bolt holes 123 corresponding to each other are formed on the surfaces of the sprocket side plate 10 and the intermediate wheel 20; wherein, on the surface of the chain wheel side plate 10 or the middle wheel 20, two adjacent bolt holes 123 are arranged in 60-degree rotational symmetry; wherein the bolt holes 123 are used to provide fastening assemblies to mount the two sets of sprocket side plates 10 and the intermediate wheel 20 together; the fastening components are a bolt 1, a nut 2 and a gasket 3.

Referring to fig. 2 and 1, the distance from the center of the circle of the plurality of bolt holes 123 formed in the surface of the sprocket side plate 10 to the center of the circle of the sprocket side plate 10 is equal to one half of the radius of the sprocket side plate 10; therefore, the purpose of fastening the chain wheel side plate 10 and the middle wheel 20 can be achieved, and the strength of the chain wheel side plate 10 can be ensured to a certain extent.

Based on the above, the present invention can be used independently, the sprocket roller pin 340 and the roller pin support 320 move as a whole, and the sprocket hobbing 30 and the sprocket roller pin 340 rotate relatively. The center distance between the driving sprocket and the driven sprocket is predetermined under the condition that the toothed chain 100 has certain tension initially, even if the chain pitch is increased after the toothed chain 100 is damaged, the self-adaptive tensioning sprocket can embody the self-adaptive advantage thereof, and tensioning is realized.

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

first, the self-adaptive tensioning chain wheel provided by the invention has a self-adaptive function, is novel in structure, is convenient to disassemble, has an adjustable initial tensioning force range, can constantly keep the optimal meshing state with a chain, and can effectively reduce the impact and vibration when the chain and the chain wheel are meshed, thereby reducing the probability of occurrence of a tooth jumping phenomenon, widening the types of tensioning devices and providing more choices for a chain transmission mechanism in mechanical transmission equipment.

Secondly, the initial presetting and the extreme positions of the tension force are realized through the rolling pin support sliding groove 110, the rolling pin support sliding groove 110 is used for adjusting 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 the stability.

Third, the spring 310 exerts an elastic force on the frame body 321, so that the two moving ends 322 slide in the corresponding roller pin bracket sliding grooves 110, and the roller pin bracket sliding grooves 110 limit the moving direction of the moving ends 322 and also limit the maximum moving distance of the moving ends 322.

Fourthly, in this embodiment, sprocket roller pin 340 is in rotational connection with sprocket roller 30 to realize that sprocket roller 30 is rotatable, and toothed chain 100 and wheel roller 30 are equivalent to a continuous rolling belt, further reducing friction and wear between toothed chain 100 and the adaptive tension sprocket in chain transmission.

Fifthly, the chain wheel hobbing 30, the chain wheel rolling pin 340, the rolling pin bracket 320 and the two moving ends 322 can float in a certain tensioning range along the radial direction of the middle wheel 20, and the phenomenon that the spring is not stressed and cannot perform tensioning action is avoided.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the present invention.