Tensioning device for chain transmission

Abstract

The utility model relates to a tensioning device for chain transmission. The tensioning device comprises two adjusting arms, two tensioning wheels, a fixing base and a spring. The two tensioning wheels are rotationally arranged at one ends of the two adjusting arms correspondingly, and the two tensioning wheels are suitable for being placed on the two sides of a chain correspondingly and connected with the two sides of the chain in a meshed mode. The other ends of the two adjusting arms are rotationally connected with the fixed seat; two ends of the spring are respectively connected with the two adjusting arms; the ends, connected with the tensioning wheels, of the two adjusting arms are each provided with a first connecting shaft, and the body length direction of the first connecting shafts is perpendicular to the body length direction of the adjusting arms. The first connecting shaft penetrates into a shaft hole of the tensioning wheel and is rotatably connected with the tensioning wheel; the faces, provided with the first connecting shafts, of the two adjusting arms are oppositely arranged so that the two tensioning wheels can be located in the same plane. The corresponding loose side during forward transmission of the chain or the corresponding loose side during reverse transmission of the chain can be pressed by the two tensioning wheels, and therefore tensioning adjustment of the chain is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of chain transmission, and in particular to a tensioning device for chain transmission. Background Art

[0002] Chain drive is a transmission method that transmits the motion and power of a driving sprocket with a special tooth shape to a driven sprocket with a special tooth shape through a chain. During the chain transmission process, if the chain tension is not enough, it may cause risks such as abnormal chain vibration and tooth jumping. Therefore, maintaining the chain tensioned state is a prerequisite for ensuring the normal and stable operation of the chain system. The existing related technology can refer to a chain tensioning device with the publication number CN115451089A; since the tensioning device is only provided on a single side of the chain, it can only be applied to the state of unidirectional transmission of the chain, so that only the loose side is tensioned; if the chain needs to be alternately transmitted in both directions, the two sides of the chain will be alternately converted to the loose side, then the device can only meet the tensioning of one side of the chain, and cannot meet the tensioning of the other side. Summary of the Invention

[0003] In view of this, the present application proposes a tensioning device for chain transmission.

[0004] According to one aspect of the present application, a tensioning device for a chain drive is provided, comprising: two adjusting arms, two tensioning pulleys, a fixing seat and a spring;

[0005] The two tensioners are rotatably arranged at one end of the two adjusting arms, and are suitable for being placed on both sides of the chain and meshing with both sides of the chain; the other ends of the two adjusting arms are rotatably connected to the fixing seat;

[0006] The two ends of the spring are respectively connected to the two adjustment arms;

[0007] A first connecting shaft is provided at one end of each of the two adjusting arms connected to the tensioning wheel, and the length direction of the first connecting shaft is perpendicular to the length direction of the adjusting arm; the first connecting shaft passes through the shaft hole of the tensioning wheel and is rotatably connected to the tensioning wheel; the two adjusting arms are provided with one side of the first connecting shaft arranged opposite to each other so that the two tensioning wheels are located in the same plane.

[0008] In a possible implementation, the device further includes: a first bearing; and a first connecting shaft rotatably connected to the tensioner through the first bearing.

[0009] In a possible implementation, a connecting tube is provided at one end of the adjusting arm connected to the fixing seat, and the fixing seat is provided with a second connecting shaft; the second connecting shaft penetrates into the connecting tube and is rotatably connected to the adjusting arm.

[0010] In a possible implementation, it further includes: a second bearing; and the second connecting shaft is rotatably connected to the adjusting arm via the second bearing.

[0011] In a possible implementation, two second bearings are provided.

[0012] In a possible implementation, an isolation gasket is further included; the isolation gasket is sleeved on the second connecting shaft and is located between the connecting pipes of the two adjusting arms.

[0013] In a possible implementation, each adjustment arm is provided with a spring connection hole, and the spring connection hole is arranged close to a side edge of the adjustment arm.

[0014] Beneficial effect: The present application is applicable to adjusting the tension of the chain during the chain transmission process. The chain is sleeved on two gears, and the rotation of the driving wheel drives the chain to transmit, thereby driving the driven wheel to rotate; the two tensioners of the present application are placed on both sides of the chain, and the two tensioners are meshed and connected with the chain. Since the two tensioners are rotatably arranged at one end of the two adjustment arms and the spring can apply tension between the two adjustment arms, the two tensioners can be brought close to each other under tension, pressing the two sides of the chain tightly, ensuring that the corresponding loose side of the chain during forward transmission or the corresponding loose side during reverse transmission can be pressed by the tensioner, and under the action of the spring tension, the distance between the two tensioners can be quickly shortened at any time according to the change of the chain transmission direction or the replacement of the driving wheel and the driven wheel, thereby achieving high tensioning efficiency.

[0015] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0017] Figure 1 A diagram showing the main structure of a chain transmission tensioning device according to an embodiment of the present application;

[0018] Figure 2 A partial structural diagram of a chain transmission tensioning device according to an embodiment of the present application is shown;

[0019] Figure 3 A cross-sectional view showing a chain transmission tensioning device according to an embodiment of the present application;

[0020] Figure 4 A diagram showing the main structure of the regulating arm according to an embodiment of the present application is shown;

[0021] Figure 5 A diagram showing the main structure of the tensioner according to an embodiment of the present application is shown;

[0022] Figure 6A diagram showing the main structure of the fixing base according to an embodiment of the present application is shown;

[0023] Figure 7 A side view of an embodiment of the present application is shown;

[0024] Figure 8 A working assembly diagram of a chain transmission tensioning device according to an embodiment of the present application is shown;

[0025] Figure 9 A working assembly diagram of a chain transmission tensioning device according to an embodiment of the present application is shown.

[0026] Adjusting arm 200 , two tensioning pulleys 300 , fixing seat 100 , spring 400 , first connecting shaft 210 , chain 500 , large gear 600 , small gear 700 , second connecting shaft 110 . DETAILED DESCRIPTION

[0027] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0028] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0030] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0031] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0032] Figure 1 A diagram showing the main structure of a chain transmission tensioning device according to an embodiment of the present application; Figure 2 A partial structural diagram of a chain transmission tensioning device according to an embodiment of the present application is shown; Figure 3 A cross-sectional view of a chain transmission tensioning device according to an embodiment of the present application is shown; Figure 1 As shown, a tensioning device for chain transmission includes: two adjusting arms 200, two tensioning pulleys 300, a fixing seat 100 and a spring 400; the two tensioning pulleys 300 are rotatably arranged at one end of the two adjusting arms 200, and the two tensioning pulleys 300 are suitable for being placed on both sides of the chain 500 and meshing with both sides of the chain 500; the other ends of the two adjusting arms 200 are rotatably connected to the fixing seat 100; the two ends of the spring 400 are respectively connected to the two adjusting arms 200; one end of the two adjusting arms 200 connected to the tensioning pulley 300 is provided with a first connecting shaft 210, and the body length direction of the first connecting shaft 210 is perpendicular to the body length direction of the adjusting arm 200; the first connecting shaft 210 penetrates into the shaft hole of the tensioning pulley 300 and is rotatably connected to the tensioning pulley 300; the two adjusting arms 200 are provided with a side of the first connecting shaft 210 opposite to each other so that the two tensioning pulleys 300 are located in the same plane.

[0033] Here, it should be noted that the fixing seat 100 is suitable for providing a mounting base for the adjustment arm 200, and the spring 400 between the two adjustment arms 200 is suitable for providing a certain tension between the two adjustment arms 200, so that the two adjustment arms 200 can rotate around the fixing seat 100 as the center, and the two tensioning wheels 300 are suitable for engaging with both sides of the chain 500. Since the spring 400 can apply tension to the two adjustment arms 200, it can ensure that the two tensioning wheels 300 are tightly engaged with the two sides of the chain 500, such as Figure 9 As shown, the small gear 700 rotates clockwise through the chain 500 to drive the large gear 600 to rotate clockwise, or the large gear 600 rotates counterclockwise through the chain 500 to drive the small gear 700 to rotate counterclockwise. In this case, the lower side of the chain 500 is tightened and the upper side of the chain 500 is loose. Since the tensioner 300 on the tightening side is engaged with the chain 500, the tensioner 300 on the loose side is pulled toward the tightening side under the pull of the spring 400. The tensioner 300 on the loose side is tightly engaged with the chain 500 under tension. At this time, the tensioner 300 on the loose side can press the chain 500 downward to form a Figure 9 The state shown in the figure is realized to adjust the tension on the loose side. Figure 8 As shown, the small gear 700 rotates counterclockwise through the chain 500 to drive the large gear 600 to rotate counterclockwise, or the large gear 600 rotates clockwise through the chain 500 to drive the small gear 700 to rotate clockwise. In this case, the upper side of the chain 500 is tightened and the lower side of the chain 500 is loose. Since the tensioning wheel 300 on the tightening side is engaged with the chain 500, the tensioning wheel 300 on the loose side is pulled toward the tightening side under the pull of the spring 400. Since the tensioning wheel 300 on the loose side is engaged with the chain 500, the tensioning wheel 300 on the loose side can press the chain 500 upward to form a Figure 8 The present application adjusts the tension between the two adjustment arms 200 through the spring 400, so that the two tensioners 300 can press the chain 500 inward under the tension, ensuring that the loose side of the chain 500 can be compressed by the tensioner 300 during forward or reverse transmission. Moreover, under the action of the tension of the spring 400, the position of the two tensioners 300 can be quickly adjusted at any time according to the change of the transmission direction of the chain 500, thereby achieving high tension efficiency.

[0034] In one possible implementation, Figure 4 As shown, a first connecting shaft 210 is provided at one end of the adjusting arm 200 connected to the tensioning wheel 300 . The first connecting shaft 210 penetrates into the shaft hole of the tensioning wheel 300 and is rotatably connected to the tensioning wheel 300 .

[0035] Here, it should be noted that the main body of the first connecting shaft 210 is a cylindrical structure, the main body of the adjusting arm 200 is an elongated plate structure, and the length direction of the first connecting shaft 210 is perpendicular to the plane where the adjusting arm 200 is located. Figure 5 As shown, the middle part of the tensioning wheel 300 is provided with an axial hole. The axial hole of the tensioning wheel 300 is sleeved on the outer side of the first connecting shaft 210. It should be noted that, as Figure 2 As shown, a protrusion 211 is provided at the top of the first connecting shaft 210 . The diameter of the protrusion 211 is slightly larger than the diameter of the shaft hole in the middle of the tensioner 300 to limit the position of the tensioner 300 and prevent the tensioner 300 from falling off the first connecting shaft 210 .

[0036] In one possible implementation, Figure 5As shown, the tensioner 300 further includes a first bearing 310. The first connecting shaft 210 is rotatably connected to the tensioner 300 via the first bearing 310. The first bearing 310 is integrally embedded in the inner sidewall of the tensioner 300. The inner ring of the first bearing 310 is sleeved on the first connecting shaft 210, and the outer ring of the first bearing 310 is in contact with the tensioner 300. The first bearing 310 improves the smoothness of the rotation of the tensioner 300 following the chain 500, thereby preventing any obstruction to the transmission of the chain 500.

[0037] In one possible implementation, the main body of the fixing base 100 is a circular disc-shaped structure. The fixing base is provided with two or more fixing holes 130. It should be noted that the fixing holes 130 are suitable for mounting the fixing base 100 at the intended installation location via bolt connection, so that the fixing base 300 supports the two tensioners 300, thereby improving the position accuracy and position stability of the two tensioners 300.

[0038] In one possible implementation, Figure 6 As shown, a second connecting shaft 110 is provided on one side of the fixing seat 100, and the main body of the second connecting shaft 110 is a cylindrical structure. An end of the second connecting shaft 110 connected to the fixing seat 100 is provided with an axis step 140 with a "convex" structure. The axis step 140 is arranged between the fixing seat 100 and the second connecting shaft 110. The setting of the axis step 140 is suitable for providing support for the adjusting arm 200 to facilitate the installation of the fixing seat 100 on other facilities.

[0039] In one possible implementation, a connecting tube 230 is provided at one end of the adjustment arm 200 connected to the fixing base 100; the second connecting shaft 110 passes through the connecting tube 230 and is rotatably connected to the connecting tube 230. It should be noted that the length of the connecting tube 230 is perpendicular to the plane on which the adjustment arm 200 lies. The provision of the connecting tube 230 enables a rotational connection between the adjustment arm 200 and the second connecting shaft 110, so that the spring 400 can drive the adjustment arm 200 to rotate about the second connecting shaft 110.

[0040] In one possible implementation, the second bearing 240 is further included; the second bearing 240 is disposed between the connecting tube 230 and the second connecting shaft 110, and the second connecting shaft 110 is rotatably connected to the adjusting arm 200 via the second bearing 240. It should be noted that the inner ring of the second bearing 240 is sleeved on the second connecting shaft 110, and the outer ring of the second bearing 240 contacts the inner wall of the connecting tube 230. The second bearing 240 improves the smoothness of the rotation of the adjusting arm 200, thereby facilitating the spring 400 pulling the two adjusting arms 200.

[0041] Further, such as Figure 3As shown, two second bearings 240 are provided in the connecting tube 230 of each adjusting arm 200 , and the two second bearings 240 are stacked to further improve the smoothness of the rotation of the adjusting arm 200 .

[0042] In one possible implementation, Figure 3 As shown, a washer 241 can be provided between the two second bearings 240 in the connecting tube 230 for isolation and support, and the washer 241 is sleeved on the outside of the second connecting shaft 110 with its upper and lower ends contacting the two second bearings 240 .

[0043] In one possible implementation, an isolation washer 120 is further included; the isolation washer 120 is sleeved on the second connecting shaft 110 and located between the connecting tubes 230 of the two adjustment arms 200. It should be noted that to prevent mutual interference and wear between the two adjustment arms 200 during movement, the isolation washer 120 is disposed between the upper and lower connecting tubes 230 to reduce friction between the connecting tubes 230.

[0044] In one possible implementation, Figure 1 As shown, it also includes: a retaining ring 150, which is sleeved on the second connecting shaft 110 and located at the top of the connecting tube 230 of the upper adjusting arm 200. The retaining ring 150 is fixedly connected to the second connecting shaft 110, thereby limiting the position of the two adjusting arms 200 below the retaining ring 150, ensuring the accurate position of the two adjusting arms 200, and preventing the two adjusting arms 200 from detaching from the second connecting shaft 110.

[0045] Preferably, Figure 4 and Figure 7 As shown, each adjustment arm 200 is provided with a spring connection hole 220, which is arranged near the side of the adjustment arm 200. Both ends of the spring 400 are provided with hooks, which are hooked in the spring connection hole 220, thereby achieving the connection between the spring 400 and the two adjustment arms 200. Figure 4 As shown, each adjustment arm 200 is provided with two spring connection holes 220 .

[0046] It should be noted that both ends of the spring 400 may also be fixed to the adjustment arm 200 by welding, bolting or bonding.

[0047] like Figure 9As shown, the large gear 600 (driving wheel) rotates counterclockwise and drives the small gear 700 (driven wheel) to rotate counterclockwise through the chain 500, and the chain 500 maintains a counterclockwise transmission (reverse transmission) state. In this case, the lower side of the chain 500 is tightened and the upper side of the chain 500 is loose. Since the tensioning wheel 300 on the tightening side is engaged with the chain 500, the tensioning wheel 300 on the loose side is pulled toward the tightening side under the pull of the spring 400. At this time, the tensioning wheel 300 on the loose side can push the chain 500 downward and maintain an engaged connection state with the chain 500, thereby realizing the tension adjustment of the loose side.

[0048] like Figure 8 As shown, the large gear 600 (driving wheel) rotates clockwise to drive the small gear 700 (driven wheel) to rotate clockwise through the chain 500, and the chain 500 maintains a clockwise transmission (forward transmission) state. In this case, the upper side of the chain 500 is tightened and the lower side of the chain 500 is loose. Since the tensioning wheel 300 on the tightening side is engaged with the chain 500, the tensioning wheel 300 on the loose side is pulled toward the tightening side under the pull of the spring 400. At this time, the tensioning wheel 300 on the loose side can push the chain 500 upward to achieve tension adjustment on the loose side.

[0049] Similarly, when the pinion 700 (if serving as the driving wheel) rotates clockwise through the chain 500, driving the large gear 600 (driven wheel) clockwise, the chain 500 maintains a clockwise transmission (forward transmission) state; in this case, the lower side of the chain 500 is tightened; or when the pinion 700 (if serving as the driving wheel) rotates counterclockwise through the chain 500, driving the large gear 600 (driven wheel) counterclockwise, the chain 500 maintains a counterclockwise transmission (reverse transmission) state; in this case, the upper side of the chain 500 is tightened. In all four transmission states, the present application can adjust the tension of the chain 500, and can quickly close the distance between the two tensioning pulleys 300 at any time according to changes in the chain transmission direction or the replacement of the driving pulley and the driven pulley, thereby achieving efficient tensioning.

[0050] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A tensioning device for chain transmission, characterized in that: include: Two adjusting arms, two tensioners, fixing seats and springs; The two tensioning wheels are rotatably disposed at one end of the two adjusting arms, respectively. The two tensioning wheels are suitable for being placed on both sides of the chain and meshing with both sides of the chain; the other ends of the two adjusting arms are rotatably connected to the fixing seat; Both ends of the spring are respectively connected to the two adjusting arms; The two adjusting arms are each provided with a first connecting shaft at one end connected to the tensioning wheel, and the length direction of the first connecting shaft is perpendicular to the length direction of the adjusting arm; the first connecting shaft passes through the axial hole of the tensioning wheel and is rotatably connected to the tensioning wheel; the two adjusting arms are provided with a side of the first connecting shaft arranged opposite to each other so that the two tensioning wheels are located in the same plane.

2. The chain transmission tensioner according to claim 1, characterized in that: Also includes: The first connecting shaft is rotatably connected to the tensioner through the first bearing.

3. The chain transmission tensioner according to claim 1, characterized in that: A connecting pipe is provided at one end of the adjusting arm connected to the fixing seat, and the fixing seat is provided with a second connecting shaft; the second connecting shaft penetrates into the connecting pipe and is rotatably connected to the adjusting arm.

4. The chain transmission tensioner according to claim 3, characterized in that: Also includes: The second connecting shaft is rotatably connected to the adjusting arm through the second bearing.

5. The chain transmission tensioner according to claim 4, characterized in that: There are two second bearings.

6. The chain transmission tensioner according to claim 3, characterized in that: It also includes an isolation gasket; the isolation gasket is sleeved on the second connecting shaft and is located between the connecting pipes of the two adjusting arms.

7. The chain transmission tensioner according to claim 1, characterized in that: Each of the adjusting arms is provided with a spring connecting hole, and the spring connecting hole is arranged close to the side of the adjusting arm.

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