Bidirectional tensioning device with continuously adjustable tensioning force for chain transmission system

Abstract

The tensioning force continuously-adjustable bidirectional tensioning device for the chain transmission system comprises a shell, a driving wheel is rotationally connected to the interior of the shell, a driven wheel is rotationally arranged on the side, away from the driving wheel, in the shell, and a transmission chain is arranged between the driving wheel and the driven wheel; a two-way tensioning mechanism is arranged in the shell and located in the middle of the transmission chain, the two-way tensioning mechanism is composed of a first tensioner and a second tensioner, and tensioning chain wheels are rotationally connected into the first tensioner and the second tensioner. The first tensioner and the second tensioner can achieve two-way tensioning and adapt to the upper-tightening and lower-loosening state in clockwise transmission and the lower-tightening and upper-loosening state in the anticlockwise direction at the same time, counter-acting force cannot be applied to the transmission chain in the tightened state, the transmission chain is always in the tightened state in operation, and it is guaranteed that the transmission chain operates stably.

Description

Technical Field

[0001] The invention relates to the technical field of chain tensioning force adjustment, and in particular to a bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system. Background Art

[0002] The chain tensioner is a commonly used chain tensioning force maintaining device in the transmission system. Its main function is to ensure that the chain can maintain appropriate tension during the transmission process, thereby avoiding the chain from loosening or falling off, preventing the chain from slipping, jumping teeth or falling off, and reducing the wear of the sprocket and chain.

[0003] The structures of chain tensioners are varied and can be roughly divided into fixed structures and elastic automatic adjustment structures. Fixed structures: fixed adjustable sprockets are often used to adjust the tension of belts and sprockets. The tension of the chain is changed by adjusting the position of the fixed components. Screws, hydraulic cylinders and other structures are often used, and the structure is relatively complex. Elastic automatic adjustment structure: elastic components (such as springs) are often used to automatically rebound to control the tension of the chain. When the length of the chain changes due to wear or thermal expansion and contraction, the elastic components can automatically adjust to keep the tension of the chain constant.

[0004] In the related art, the chain tensioning device using an elastic automatic adjustment mechanism is mostly one-way tensioning. When the driving wheel rotates clockwise, the upper chain is in a tensioned state and the lower chain is in a relaxed state. At this time, the chain tensioning device acts on the lower chain to put the lower chain in a tensioned state. When the driving wheel rotates counterclockwise, the lower chain is in a tensioned state and the upper chain is in a relaxed state. Since the chain tensioning device can only act on one side of the chain, that is, it still acts on the lower chain, the upper chain in a relaxed state cannot be tensioned, but instead a reaction force is applied to the lower chain in a tensioned state, increasing the chain running resistance and instability. Summary of the invention

[0005] The main purpose of the present invention is to provide a bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system, aiming to solve the existing technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides a bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system, which acts on the chain transmission system. The chain transmission system includes a shell, a driving wheel and a driven wheel are arranged in the shell, and the driving wheel and the driven wheel are connected by a transmission chain. The bidirectional tensioning device includes a tensioner 1 and a tensioner 2, wherein the tensioner 1 and the tensioner 2 are hingedly connected by a hinge frame, and the tensioner 1 and the tensioner 2 are both rotatably connected with a tensioning sprocket inside, and the two tensioning sprockets are meshed with the transmission chain, wherein there is an elastic pre-tightening force between the tensioner 1 and the tensioner 2 toward each other.

[0007] Furthermore, connection holes are provided on the surfaces of tensioner 1 and tensioner 2, and spring connecting rods are penetrated and connected inside the connection holes. An elastic member is provided between the two spring connecting rods, and the elastic member applies an elastic pre-tightening force to tensioner 1 and tensioner 2 toward each other.

[0008] Furthermore, a connecting rod is provided at the connection between the tensioner 1 and the tensioner 2 and the articulated frame. The connecting rod is arranged at a certain angle with the tensioner 1 and the tensioner 2 and can move along the setting direction.

[0009] Furthermore, the connecting rod is connected to the side wall of the adjustment seat, a guide rod is movably inserted into the adjustment seat, both ends of the guide rod are connected to fixed seats, one side of the fixed seat is provided with a linear mechanism, and the output end of the linear mechanism is connected to the adjustment seat.

[0010] Furthermore, an oiling unit is provided inside the tensioner 1, and the oiling unit is used to intermittently oil the transmission chain.

[0011] Further, the oiling unit includes a transverse shaft rotatably disposed inside the tensioner 1, an end of the transverse shaft is connected to a tensioning sprocket inside the tensioner 1, an end of the transverse shaft away from the tensioning sprocket is fixedly mounted with an incomplete gear, the oiling unit also includes a transmission gear rotatably disposed inside the housing, and the incomplete gear is meshedly connected with the transmission gear;

[0012] It also includes an oil storage chamber, which is installed inside the shell, and a piston rack is slidably arranged inside the oil storage chamber, an oil outlet pipe is installed on the lower surface of the oil storage chamber, a connecting shaft is installed on the side wall of the transmission gear, a convex rod is fixedly installed on the outer peripheral surface of the connecting shaft, and the connecting shaft is connected to the upper surface of the piston rack during the process of driving the convex rod to rotate.

[0013] Furthermore, an oil outlet film is sleeved on the oil outlet end of the oil outlet pipe. The oil outlet film is made of elastic material, and a plurality of oil outlet holes are formed on the surface of the oil outlet film.

[0014] Furthermore, cleaning rods are arranged around the outer circumferences of the tensioner 1 and the tensioner 2, and the ends of the cleaning rods are arranged near the outer surface of the transmission chain and are arranged with an adjustable distance from the transmission chain.

[0015] Furthermore, the end of the cleaning rod is in a cone shape, and the surface of the end away from the transmission chain is in an inclined surface shape.

[0016] Furthermore, a plurality of the connection holes are provided on the surfaces of the tensioner 1 and the tensioner 2, and the plurality of the connection holes on the surface of the tensioner 1 and the plurality of the connection holes on the surface of the tensioner 2 are arranged in a one-to-one correspondence.

[0017] The beneficial effects of the present invention are embodied in:

[0018] The chain transmission system described in the present invention uses a bidirectional tensioning device with continuously adjustable tensioning force. Bidirectional tensioning can be achieved through tensioner one and tensioner two, and it can adapt to clockwise transmission, tightening up and loosening down, and counterclockwise transmission, tightening down and loosening up, and will not apply reaction force to the transmission chain in a taut state, so that the transmission chain is always in a tensioned state, thereby ensuring smooth operation of the transmission chain.

[0019] The chain transmission system described in the present invention uses a bidirectional tensioning device with continuously adjustable tensioning force. The adjusting seat drives the connecting rod connected to it to move, and the connecting rod drives the articulated frame in contact with it to move, so that the articulated frame drives tensioner 1 and tensioner 2 to approach each other, that is, the tensioning sprockets inside tensioner 1 and tensioner 2 will approach each other and mesh with the upper chain or the lower chain of the transmission chain, so that the transmission chain is always in a tensioned state, ensuring the smooth operation of the transmission chain.

[0020] The chain transmission system described in the present invention uses a bidirectional tensioning device with continuously adjustable tensioning force. The connecting shaft and the convex rod are driven to rotate by the transmission gear. The convex rod will contact the convex end of the piston frame during the rotation, so that the piston frame squeezes the lubricating oil inside the oil storage chamber, and then leaks out through the oil outlet end of the oil outlet pipe and drips onto the surface of the transmission chain. The oil outlet end of the oil outlet pipe faces the top of the transmission chain. When the lubricating oil drips, it will first drip onto the surface of the transmission chain, and then under the engagement of the tensioning sprocket and the transmission chain, the oil can adhere to the surface of each chain as soon as possible, which is beneficial to the lubrication of the entire chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a stereogram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the transmission chain in the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of tensioner 1 and tensioner 2 in the present invention;

[0024] Figure 4 It is a structural schematic diagram of the spring connecting rod in the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the elastic member in the present invention;

[0026] Figure 6 It is a structural schematic diagram of the fixing seat in the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the incomplete gear in the present invention;

[0028] Figure 8 It is a structural schematic diagram of the oil storage cavity in the present invention;

[0029] Fig. 9 It is a structural schematic diagram of the convex rod in the present invention;

[0030] Fig.10 It is a schematic diagram of the cross-sectional structure of the oil storage cavity in the present invention.

[0031] Description of reference numerals:

[0032] 1. Housing; 2. Driving wheel; 3. Driven wheel; 4. Transmission chain; 501. Tensioner 1; 502. Tensioner 2; 503. Tensioning sprocket; 6. Articulated frame; 601. Connecting rod; 7. Connecting hole; 701. Spring connecting rod; 8. Elastic member; 9. Fixed seat; 10. Linear mechanism; 11. Adjusting seat; 12. Guide rod; 13. Horizontal axis; 14. Incomplete gear; 15. Transmission gear; 16. Oil storage chamber; 17. Piston frame; 18. Oil outlet pipe; 19. Connecting shaft; 20. Protruding rod; 21. Oil outlet film; 22. Oil outlet hole; 23. Cleaning rod. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Since the chain tensioning device can only act on one side of the chain, that is, it still acts on the lower chain, it cannot tension the upper chain in a relaxed state, but instead exerts a reaction force on the lower chain in a tense state, increasing the chain running resistance and instability. For this reason, the present invention proposes the following embodiments:

[0035] Embodiment 1

[0036] like Figures 1 to 5 As shown, a bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system according to an embodiment of the present invention is used to provide continuously adjustable tensioning force for the chain transmission system.

[0037] The chain transmission system includes a housing 1, a driving wheel 2, a driven wheel 3 and a transmission chain 4; the driving wheel 2 and the driven wheel 3 are designed to be far away from each other, and the transmission chain 4 is arranged between the driving wheel 2 and the driven wheel 3;

[0038] It should be noted that the housing 1 mainly supports and protects the driving wheel 2, the driven wheel 3 and the transmission chain 4. The driving wheel 2 is connected to an external control system, and the driving wheel 2 can be controlled to rotate clockwise or counterclockwise through the external control system;

[0039] The bidirectional tensioning device comprises a tensioner 501 and a tensioner 502, wherein the tensioner 501 and the tensioner 502 are both rotatably connected with a tensioning sprocket 503, and the two tensioning sprockets 503 are both meshed and connected with the transmission chain 4 of the chain transmission system, and the tensioner 501 and the tensioner 502 are hingedly connected through an articulated frame 6, and the surfaces of the tensioner 501 and the tensioner 502 are both provided with through grooves adapted to the articulated frame 6; the bidirectional tensioning device can provide a continuously adjustable tensioning force to the transmission chain 4, and the specific operation process is as follows:

[0040] When the driving wheel 2 rotates clockwise, the upper chain of the transmission chain 4 will be in a tightened state, while the lower chain will be in a relaxed state. At this time, under the action of the articulated frame 6, it will move and drive the tensioner 1 501 and the tensioner 2 502 to rotate at a certain angle, and make the tensioning sprocket 503 inside the tensioner 2 502 combine with the relaxed lower chain to convert the relaxed lower chain into a tensioned state; when the driving wheel 2 rotates counterclockwise, the tensioning sprocket 503 inside the tensioner 1 501 will combine with the relaxed upper chain to convert the relaxed upper chain into a tensioned state. With such a design, the tensioner 1 501 and the tensioner 2 502 in the present invention can realize bidirectional tensioning, and at the same time adapt to the clockwise transmission tightening and loosening states and the counterclockwise transmission tightening and loosening states. No reaction force will be applied to the transmission chain 4 in a tightened state, so that the transmission chain 4 is always in a tensioned state, thereby ensuring the smooth operation of the transmission chain 4.

[0041] The surfaces of tensioner 1 501 and tensioner 2 502 are both provided with connecting holes 7, and a spring connecting rod 701 is penetrated and connected inside each connecting hole 7, and an elastic member 8 is arranged between the two spring connecting rods 701, and the elastic member 8 can apply an elastic pre-tightening force to tensioner 1 501 and tensioner 2 502 to move them closer to each other, and the elastic member 8 can be a spring or a tension spring, etc.; when working, when tensioner 1 501 and tensioner 2 502 rotate at a certain angle under the action of the articulated frame 6, the two will be applied with an elastic pre-tightening force to move them closer to each other by the elastic member 8, so that the transmission chains 4 on the upper and lower sides have a tendency to move closer to each other, so as to realize the tensioning of the transmission chain 4, reduce the running resistance of the transmission chain 4, and improve the running stability of the chain.

[0042] A plurality of connection holes 7 are provided on the surfaces of the tensioner 1 501 and the tensioner 2 502, and the plurality of connection holes 7 on the surface of the tensioner 1 501 and the plurality of connection holes 7 on the surface of the tensioner 2 502 are arranged in a one-to-one correspondence;

[0043] When the two ends of the elastic member 8 are connected to the spring connecting rod 701 between two different connecting holes 7, the elastic member 8 will have different elastic preload forces, thereby facilitating the adjustment of the elastic preload forces of the elastic member 8 by changing the connecting positions of the two ends of the elastic member 8, thereby improving the adaptability of the tensioner 1 501 and the tensioner 2 502, and increasing the effective tension range of the transmission chain 4. During installation, the elastic member 8 with a suitable stroke and stiffness coefficient can be selected according to the actual errors of the spring connecting rod 701 and the connecting hole 7.

[0044] Embodiment 2:

[0045] Since the transmission chain 4 of the chain transmission system needs to flexibly adjust the tension of the upper chain and the lower chain during the rotation process, and in order to ensure that the tensioner 1 501 and the tensioner 2 502 can be stably close to each other; therefore, the technical solution of embodiment 2 is provided on the basis of embodiment 1, which is as follows:

[0046] See attached Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Fig. 9 As shown, an adjusting unit is arranged inside the housing 1, and the adjusting unit includes a connecting rod 601 connected to the hinge frame 6 at the hinge between the tensioner 1 501 and the tensioner 2 502, and the adjusting unit can drive the hinge of the tensioner 1 501 and the tensioner 2 502 to move through the connecting rod 601; when working, the connecting rod 601 and the hinge of the tensioner 1 501 and the tensioner 2 502 are driven to move by the adjusting unit to change the maximum distance between the tensioner 1 501 and the tensioner 2 502, thereby adjusting the size of the tendency of the transmission chains 4 on both sides of the tensioner 1 501 and the tensioner 2 502 to approach each other to meet the actual tensioning requirements.

[0047] The adjustment unit also includes a fixed seat 9, which is arranged on the inner wall of the shell 1. Two fixed seats 9 are arranged and are designed to be separated from each other. The adjustment unit electric telescopic rod 10 is installed on the inner wall of the shell 1. An adjustment seat 11 is slidably arranged between two adjacent fixed seats 9. The connecting rod 601 is connected to the side wall of the adjustment seat 11. The telescopic end of the electric telescopic rod 10 passes through one of the fixed seats 9 and is connected to the side wall of the adjustment seat 11. When working, when the driving wheel 2 rotates clockwise or counterclockwise, that is, when the external control system controls the driving wheel 2 to rotate, the external control system will At the same time, the telescopic end of the electric telescopic rod 10 is controlled to move, so that the telescopic end of the electric telescopic rod 10 drives the adjustment seat 11 to move, and the adjustment seat 11 drives the connecting rod 601 connected thereto to move, and the connecting rod 601 drives the articulated frame 6 in contact therewith to move, so that the articulated frame 6 drives the tensioner 1 501 and the tensioner 2 502 to approach each other, that is, the tensioning sprockets 503 inside the tensioner 1 501 and the tensioner 2 502 will approach each other and mesh with the upper chain or the lower chain of the transmission chain 4, so that the transmission chain 4 is always in a tensioned state, ensuring the smooth operation of the transmission chain 4.

[0048] A guide rod 12 is fixedly installed between the two fixed seats 9, and the adjustment seat 11 is slidably arranged on the outer peripheral surface of the guide rod 12. A groove matching the guide rod 12 is opened inside the adjustment seat 11, and an oiling unit is arranged inside the tensioner 501, and the oiling unit is used to intermittently oil the transmission chain 4; during operation, when the adjustment seat 11 moves between the two fixed seats 9, the adjustment seat 11 will move on the outer peripheral surface of the guide rod 12. Under the limitation and guidance of the guide rod 12, it can ensure that the adjustment seat 11 drives the connecting rod 601 and the articulated frame 6 to move, so that the tensioner 1 501 and the tensioner 2 502 can be stably brought close to each other.

[0049] It should be noted that the tensioner 1 501 and the tensioner 2 502 are provided with multiple spring installation positions, i.e., multiple connection holes 7, which can compensate for the processing errors of parts. According to the on-site installation conditions, springs with different strokes and tensions can be selected to ensure that the tension of the chain is in a suitable state; the chain tensioning device 10 can maximize the use of the effective space between the driving wheel 20 and the driven wheel 30, and increase the effective working range of the chain tensioning device 10.

[0050] Embodiment three:

[0051] Since the chain is a component for power transmission, its own lubrication effect and running smoothness will also decrease when the chain works for a long time. Therefore, a technical solution of embodiment 3 is further provided on the basis of embodiment 1 and embodiment 2, which is as follows:

[0052] See attached Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the oiling unit includes a transverse shaft 13 rotatably arranged inside the tensioner 501, the end of the transverse shaft 13 is connected to the tensioning sprocket 503 inside the tensioner 501, and an incomplete gear 14 is fixedly installed at the end of the transverse shaft 13 away from the tensioning sprocket 503. The oiling unit also includes a transmission gear 15, which is rotatably arranged inside the housing 1, and the incomplete gear 14 and the transmission gear 15 are meshingly connected. The oiling unit also includes an oil storage chamber 16, which is installed inside the housing 1, and a piston frame 17 is slidably arranged inside the oil storage chamber 16, and an oil outlet pipe 18 is installed on the lower surface of the oil storage chamber 16. A connecting shaft 19 is installed on the side wall of the transmission gear 15, and a convex rod 20 is fixedly installed on the outer peripheral surface of the connecting shaft 19. The connecting shaft 19 will be connected to the upper surface of the piston frame 17 during the process of driving the convex rod 20 to rotate;

[0053] During operation, when the tensioning sprocket 503 is meshed with the transmission chain 4, the tensioning sprocket 503 will rotate at a certain angle, and the tensioning sprocket 503 will drive the horizontal shaft 13 and the incomplete gear 14 to rotate, and the incomplete gear 14 will drive the transmission gear 15 meshed with it to rotate, and the transmission gear 15 will drive the connecting shaft 19 and the protruding rod 20 to rotate. The protruding rod 20 will contact the protruding end of the piston frame 17 during the rotation process, so that the piston frame 17 squeezes the lubricating oil inside the oil storage chamber 16, and then leaks out through the oil outlet end of the oil outlet pipe 18 and drips onto the surface of the transmission chain 4, refer to the attached Fig. 9 As shown, the oil outlet end of the oil outlet pipe 18 faces the top of the transmission chain 4. When the lubricating oil drops, it will first drip onto the surface of the transmission chain 4, and then under the meshing of the tensioning sprocket 503 and the transmission chain 4, the oil can adhere to the surface of each chain as soon as possible, which is beneficial to the lubrication of the entire chain.

[0054] At the same time, the meshing of the incomplete gear 14 and the transmission gear 15 is designed to make the connecting shaft 19 rotate intermittently, so that the piston frame 17 is intermittently pressurized, that is, the lubricating oil inside the oil storage chamber 16 will drip intermittently, which can improve the lubrication effect and the smoothness of operation, and can further improve the use efficiency of the tensioning device in the embodiment of the present invention, that is, better realize the bidirectional tensioning effect of the chain.

[0055] The oil outlet end of the oil outlet pipe 18 is sleeved with an oil outlet film 21, and the material of the oil outlet film 21 is an elastic material; a plurality of oil outlet holes 22 are provided on the surface of the oil outlet film 21; during operation, since the material of the oil outlet film 21 is an elastic material, the oil inside the oil outlet pipe 18 will not drip when it is not subjected to pressure. When subjected to pressure from the piston rack 17, the oil inside the oil outlet pipe 18 will squeeze the oil outlet film 21, thereby increasing the aperture of the oil outlet hole 22, so that the oil inside it will leak out through the oil outlet hole 22, thereby achieving the lubrication effect on the transmission chain 4.

[0056] It should be noted that the oil storage chamber 16 is connected to the external oil delivery seat through an external oil pipe.

[0057] Embodiment 4:

[0058] Since the chain is a component for power transmission, more impurities will be generated on the chain when the chain works for a long time, and the impurities will adhere to the transmission chain 4. The larger impurities will affect the transmission effect of the chain and produce abnormal noise. Therefore, on the basis of the first, second and third embodiments, the technical solution of the fourth embodiment is further provided, which is as follows:

[0059] Cleaning rods 23 are arranged around the outer circumference of the tensioner 1 501 and the tensioner 2 502 . The cleaning rods 23 are arranged near the outer surface of the transmission chain 4 and the distance between the cleaning rods 23 and the transmission chain 4 is adjustable.

[0060] Specifically, the end of the cleaning rod 23 is provided with an insertion rod movably connected to the tensioner 1 501 and the tensioner 2 502. The insertion rod can slide in a direction away from or close to the transmission chain 4, and is fixed by bolts after positioning.

[0061] When working, refer to the attached Figure 6 and Figure 8 As shown, the cleaning rod 23 faces the outside of the transmission chain 4. When larger impurities adhere to the surface of the transmission chain 4, these impurities will be broken under the action of the cleaning rod 23. In addition, under the mutual engagement of the tensioning sprocket 503 and the transmission chain 4, the impurities on the surface of the transmission chain 4 can also be broken, thereby improving the smoothness of the operation of the transmission chain 4, and can play a complementary and linkage effect, thereby improving the smoothness of the chain operation.

[0062] The cleaning rod 23 is conical in shape, and the surface of its end away from the transmission chain 4 is inclined. This arrangement can facilitate the separation of impurities cleaned from the transmission chain 4, and also reduces the resistance of the cleaning rod 23 in contact with the impurities, thereby improving the cleaning efficiency.

[0063] Preferably, the outer peripheral surface of the cleaning rod 23 is sleeved with a cleaning rubber sleeve, and such a design facilitates the crushing of larger impurities.

[0064] During operation, when the driving wheel 2 rotates clockwise, the upper chain of the transmission chain 4 will be in a tightened state, while the lower chain will be in a relaxed state. At this time, under the action of the articulated frame 6, it will move and drive the tensioner 1 501 and the tensioner 2 502 to rotate at a certain angle, and make the tensioning sprocket 503 inside the tensioner 2 502 combine with the relaxed lower chain to convert the relaxed lower chain into a tensioned state; when the driving wheel 2 rotates counterclockwise, the tensioning sprocket 503 inside the tensioner 1 501 will combine with the relaxed upper chain to convert the relaxed upper chain into a tensioned state. With this design, the tensioner 1 501 and the tensioner 2 in the present invention are Device 2 502 can realize bidirectional tensioning, and adapt to the clockwise transmission tightening up and loosening down and counterclockwise transmission tightening down and loosening up state at the same time, and will not apply reaction force to the transmission chain 4 in a tense state, so that the transmission chain 4 is always in a tensioned state, ensuring the smooth operation of the transmission chain 4; when under the action of the articulated frame 6, the tensioner 1 501 and the tensioner 2 502 rotate at a certain angle, that is, the two will be applied with elastic pre-tightening force towards each other by the elastic member 8, so that the transmission chains 4 on the upper and lower sides have a tendency to approach each other, so as to realize the tensioning of the transmission chain 4, reduce the running resistance of the transmission chain 4, and improve the running stability of the chain.

[0065] When the driving wheel 2 rotates clockwise or counterclockwise, that is, when the external control system controls the driving wheel 2 to rotate, the external control system will simultaneously control the telescopic end of the electric telescopic rod 10 to move, so that the telescopic end of the electric telescopic rod 10 drives the adjustment seat 11 to move, and the adjustment seat 11 drives the connecting rod 601 connected thereto to move, and the connecting rod 601 drives the articulated frame 6 in contact therewith to move, so that the articulated frame 6 drives the tensioner 1 501 and the tensioner 2 502 to move closer to each other, that is, the tensioning sprockets 503 inside the tensioner 1 501 and the tensioner 2 502 will move closer to each other and mesh with the upper chain or the lower chain of the transmission chain 4, so that the transmission chain 4 is always in a tensioned state, ensuring the smooth operation of the transmission chain 4;

[0066] When the tensioning sprocket 503 is meshed with the transmission chain 4, the tensioning sprocket 503 will rotate at a certain angle, and the tensioning sprocket 503 will drive the horizontal shaft 13 and the incomplete gear 14 to rotate, and the incomplete gear 14 will drive the transmission gear 15 meshed with it to rotate, and the transmission gear 15 will drive the connecting shaft 19 and the protruding rod 20 to rotate. The protruding rod 20 will contact the protruding end of the piston frame 17 during the rotation process, so that the piston frame 17 squeezes the lubricating oil inside the oil storage chamber 16, and then leaks out through the oil outlet end of the oil outlet pipe 18 and drips onto the surface of the transmission chain 4, refer to the attached Fig. 9 As shown, the oil outlet end of the oil outlet pipe 18 faces the top of the transmission chain 4. When the lubricating oil drops, it will first drip onto the surface of the transmission chain 4, and then under the meshing of the tensioning sprocket 503 and the transmission chain 4, the oil can adhere to the surface of each chain as soon as possible, which is beneficial to the lubrication of the entire chain.

[0067] At the same time, the meshing of the incomplete gear 14 and the transmission gear 15 is designed to make the connecting shaft 19 rotate intermittently, so that the piston frame 17 is intermittently pressurized, that is, the lubricating oil inside the oil storage chamber 16 will drip intermittently, which can improve the lubrication effect and the smoothness of operation, and can further improve the use efficiency of the tensioning device in the embodiment of the present invention, that is, better realize the bidirectional tensioning effect of the chain.

[0068] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0069] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bidirectional tensioning device with continuously adjustable tensioning force for a chain drive system, acting on the chain drive system, the chain drive system comprising a housing (1), a driving wheel (2) and a driven wheel (3) being arranged in the housing (1), the driving wheel (2) and the driven wheel (3) being connected by a transmission chain (4), characterized in that: The bidirectional tensioning device comprises: Tensioner 1 (501) and tensioner 2 (502), wherein tensioner 1 (501) and tensioner 2 (502) are hingedly connected via an articulated frame (6), and tensioner 1 (501) and tensioner 2 (502) are both rotatably connected with tensioning sprockets (503) inside, and both tensioning sprockets (503) are meshedly connected with the transmission chain (4), wherein tensioner 1 (501) and tensioner 2 (502) have an elastic pre-tightening force toward each other.

2. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 1, characterized in that: The surfaces of the tensioner 1 (501) and the tensioner 2 (502) are both provided with connection holes (7), the interiors of the connection holes (7) are both penetrated by spring connecting rods (701), an elastic member (8) is arranged between the two spring connecting rods (701), and the elastic member (8) applies an elastic pre-tightening force to the tensioner 1 (501) and the tensioner 2 (502) to move them closer to each other.

3. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 2, characterized in that: A connecting rod (601) is provided at the connection between the tensioner 1 (501) and the tensioner 2 (502) and the articulated frame (6); the connecting rod (601) is arranged at a certain angle with the tensioner 1 (501) and the tensioner 2 (502), and can move along the setting direction.

4. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 3, characterized in that: The connecting rod (601) is connected to the side wall of the adjustment seat (11); a guide rod (12) movably penetrates the adjustment seat (11); both ends of the guide rod (12) are connected to fixed seats (9); a linear mechanism (10) is provided on one side of the fixed seat (9); and an output end of the linear mechanism (10) is connected to the adjustment seat (11).

5. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 1, characterized in that: An oiling unit is provided inside the tensioner 1 (501), and the oiling unit is used to intermittently oil the transmission chain (4).

6. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 5, characterized in that: The oiling unit comprises a transverse shaft (13) rotatably arranged inside the tensioner (501), an end of the transverse shaft (13) being connected to a tensioning sprocket (503) inside the tensioner (501), an incomplete gear (14) being fixedly mounted on the end of the transverse shaft (13) away from the tensioning sprocket (503), the oiling unit further comprises a transmission gear (15), the transmission gear (15) being rotatably arranged inside the housing (1), the incomplete gear (14) and the transmission gear (15) being meshingly connected; It also includes an oil storage chamber (16), the oil storage chamber (16) is installed inside the housing (1), a piston frame (17) is slidably arranged inside the oil storage chamber (16), an oil outlet pipe (18) is installed on the lower surface of the oil storage chamber (16), a connecting shaft (19) is installed on the side wall of the transmission gear (15), a convex rod (20) is fixedly installed on the outer peripheral surface of the connecting shaft (19), and the connecting shaft (19) is connected to the upper surface of the piston frame (17) during the process of driving the convex rod (20) to rotate.

7. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 6, characterized in that: The oil outlet end of the oil outlet pipe (18) is sleeved with an oil outlet film (21), the material of the oil outlet film (21) is elastic material, and a plurality of oil outlet holes (22) are provided on the surface of the oil outlet film (21).

8. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 1, characterized in that: Cleaning rods (23) are arranged around the outer circumference of the tensioner 1 (501) and the tensioner 2 (502), and the ends of the cleaning rods (23) are arranged near the outer surface of the transmission chain (4) and are arranged with an adjustable distance between the cleaning rods (23) and the transmission chain (4).

9. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 8, characterized in that: The end of the cleaning rod (23) is in a cone shape, and the surface of the end away from the transmission chain (4) is in an inclined surface shape.

10. A bidirectional tensioning device with continuously adjustable tensioning force for a chain transmission system as claimed in claim 2, characterized in that: A plurality of the connection holes (7) are provided on the surface of tensioner one (501) and tensioner two (502), and the plurality of the connection holes (7) on the surface of tensioner one (501) and the plurality of the connection holes (7) on the surface of tensioner two (502) are arranged in a one-to-one correspondence.

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