Cam belt tensioning mechanism and amphibious vehicle

Abstract

The utility model discloses a cam belt tensioning mechanism and an amphibious vehicle. The cam belt tensioning mechanism comprises a mounting base, an adjusting bolt and a sliding bolt. A cam is arranged on the adjusting bolt, a pressing wheel is arranged on the sliding bolt, and tensioning adjustment of the transmission belt is achieved through rotation of the cam. The installation base is of a U-shaped structure and is provided with a sliding groove for the sliding bolt to move, and the adjusting bolt is fixed through the special-shaped hole and the adjusting nut. And the cam adopts an asymmetric shaft section design, and pushes the pressing wheel to continuously adjust the tension force during rotation. In a further optimized scheme, a rotating sleeve shaft is additionally arranged on the outer side of the cam, and friction is reduced. The mechanism is simple in structure, accurate in adjustment, suitable for tensioning control over the vehicle transmission belt, and particularly suitable for amphibious vehicles.

Description

A cam belt tensioning mechanism and an amphibious vehicle Technical Field

[0001] This utility model relates to the field of tensioning technology, and more specifically, to a cam belt tensioning mechanism and an amphibious vehicle. Background Technology

[0002] Amphibious vehicles possess the characteristics of both vehicles and boats, allowing them to travel on land and float on water. Due to their superior amphibious capabilities, amphibious vehicles can cross rivers, lakes, and seas while in motion, without being restricted by bridges or boats, thus gaining widespread attention and application in transportation and military fields.

[0003] During the manufacturing process of amphibious vehicles, due to differences in vehicle manufacturing techniques, the tension of each vehicle after assembly varies, requiring adjustment of the tension for each vehicle based on actual conditions. However, current technology uses coil springs to initiate tension, and the resulting tension cannot be adjusted.

[0004] For example, Chinese Patent Publication No. CN217874023U, published on November 22, 2022, is entitled "A belt tensioning device for vehicles". It mainly uses a helical spring to press against a mounting shaft under its own elastic force. Since the mounting shaft is fixedly connected to one of the gears, the mounting shaft can slide in the transverse sliding hole. Thus, the gear can slide in the direction away from the other gear under the action of the helical spring, thereby tightening the flexible belt and realizing the function of automatically tensioning the flexible belt.

[0005] In the above structure, although the tensioning action can be initiated by the coil spring, the tension force cannot be adjusted. Therefore, the tension force on the vehicle cannot be adjusted according to the actual manufacturing conditions of each vehicle. Summary of the Invention

[0006] This invention overcomes the problem that existing tensioning mechanisms mostly use helical springs to achieve the tensioning function, but the tension of helical springs cannot be adjusted, thus failing to adjust the tension of each vehicle according to the actual situation of the vehicle. It provides a cam belt tensioning mechanism that can adjust the tension of each vehicle according to the actual situation of each vehicle, and the adjustment is convenient. The magnitude of the tension can be continuously changed, enabling each vehicle to achieve the optimal tension state.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a cam belt tensioning mechanism, comprising: a mounting base, on which an adjusting bolt and a sliding bolt are provided; the adjusting bolt and the sliding bolt are arranged in parallel, and the sliding bolt can slide radially along the adjusting bolt; a cam is provided on the adjusting bolt, and a pressure wheel that abuts against the cam is provided on the sliding bolt; rotating the adjusting bolt drives the cam to rotate, and the cam pushes the pressure wheel to move.

[0008] In use, this invention involves mounting the base on a vehicle so that the pressure roller abuts against the vehicle's drive belt. Then, depending on the belt tension, the adjusting bolt is rotated. Due to the varying radii of the cams, rotating the adjusting bolt changes the radius at the contact point between the cam and the pressure roller, thereby pushing the pressure roller to move radially along the cam. This alters the force exerted by the cam on the pressure roller, thus adjusting the drive belt tension. Because this invention uses a cam to adjust tension, and the cam radius gradually changes, continuous adjustment of the drive belt tension is achieved, ensuring that each vehicle's drive belt reaches its optimal tension.

[0009] Preferably, the mounting base is provided with a sliding groove, and the sliding bolt passes through the sliding groove.

[0010] After the sliding bolts pass through the grooves on the two vertical plates in sequence, they are connected to the sliding bolts. This causes the clamping wheel to move radially along the cam.

[0011] Preferably, the adjusting bolt is provided with an adjusting nut that mates with it; the mounting base is provided with a first through hole, through which the adjusting bolt passes and connects with the adjusting nut.

[0012] The adjusting bolt and adjusting nut position and fix the cam, allowing them to be clamped onto both sides of the mounting base.

[0013] Preferably, the mounting base includes a horizontal plate and vertical plates arranged parallel to each other at both ends of the horizontal plate, with the horizontal plate and vertical plates working together to form a "U"-shaped mounting base.

[0014] The horizontal plate serves as a support, and the gap between the two vertical plates is used to install the cam and the pressure roller.

[0015] Preferably, an irregularly shaped hole is provided at the end of the adjusting bolt.

[0016] The irregular hole is designed to be non-circular, allowing the adjusting bolt to be turned with a corresponding wrench, making it easy to change the support point of the cam and the pressure wheel. In addition, the irregular hole is designed to be an uncommon shape, which avoids the need to turn the adjusting bolt with ordinary tools, thus preventing the adjusting bolt from being turned easily by human hands.

[0017] Preferably, a support bearing is provided on the sliding bolt, and the clamping wheel is located around the support bearing.

[0018] Two support bearings are placed at both ends of the clamping wheel, which is located around the support bearings and can rotate freely.

[0019] Preferably, a support bushing is provided on the sliding bolt, and the support bushing is located at both ends of the clamping wheel.

[0020] The support bushing can limit the pressure roller and prevent it from contacting the vertical plate.

[0021] Preferably, the adjusting bolt has a frosted surface on the side facing the mounting base, and the mounting base has a fixing surface that mates with the frosted surface.

[0022] Both the fixed surface and the frosted surface are made with a frosted process, which can increase the friction between the adjusting nut and the mounting base (vertical plate), thereby preventing the adjusting bolt from rotating due to the force transmitted to the cam by the tension wheel.

[0023] This application also provides an amphibious vehicle, including the aforementioned cam belt tensioning mechanism.

[0024] Install the mounting base on the vehicle so that the pressure wheel abuts against the drive belt on the vehicle. Then, adjust the tension of the drive belt by turning the adjusting bolt according to the tightness of the drive belt.

[0025] Preferably, it also includes a drive belt, with the pressure roller abutting against the drive belt.

[0026] Install the mounting base on the vehicle so that the pressure wheel abuts against the drive belt on the vehicle. Then, adjust the tension of the drive belt by turning the adjusting bolt according to the tightness of the drive belt.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows: The mounting base is installed on the vehicle, causing the pressure roller to abut against the drive belt. Then, depending on the tension of the drive belt, the adjusting bolt is rotated. Due to the different radii of the cams, rotating the adjusting bolt changes the radius at the contact point between the cam and the pressure roller, thereby pushing the pressure roller to slide along the groove. This changes the force exerted by the cam on the pressure roller, thus adjusting the tension of the drive belt. Because this application uses a cam to adjust the tension, the radius of the cam gradually changes, allowing for continuous adjustment of the tension on the drive belt, ensuring that the drive belt on each vehicle reaches its optimal tension. Attached Figure Description

[0028] Figure 1 is a three-dimensional structural diagram of this utility model.

[0029] Figure 2 is an exploded view of this utility model.

[0030] Figure 3 is a front view of this utility model.

[0031] Figure 4 is a side view of this utility model.

[0032] Figure 5 is a cross-sectional view along the AA direction in Figure 4.

[0033] Figure 6 is a cross-sectional view along the BB direction in Figure 3.

[0034] Figure 7 is a schematic diagram of the present invention when it is used in conjunction with a transmission belt.

[0035] Figure 8 is a three-dimensional structural diagram of Embodiment 3 of this utility model.

[0036] In the diagram: 1. Mounting base; 11. Horizontal plate; 12. Vertical plate; 13. First through hole; 14. Sliding groove.

[0037] 2. Adjusting bolt; 21. First shaft section; 22. Second shaft section; 23. Third shaft section; 24. Fourth shaft section; 25. Adjusting nut; 26. Irregular hole;

[0038] 3. Sliding bolts;

[0039] 4. Cam; 41. Second through hole; 42. Mounting groove; 43. Mounting shaft; 44. Rotating sleeve shaft;

[0040] 5. Pressure roller; 51. Third through hole; 52. End ring groove;

[0041] 6. Support bearing;

[0042] 7. Support bushing;

[0043] 8. Transmission belt. Detailed Implementation

[0044] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0045] Example 1: Referring to Figures 1 to 6, a cam belt tensioning mechanism includes: a mounting base 1, on which an adjusting bolt 2 and a sliding bolt 3 are provided; the adjusting bolt 2 and the sliding bolt 3 are arranged in parallel, and the sliding bolt 3 can slide towards or away from the adjusting bolt 2; a cam 4 is provided on the adjusting bolt 2, and a pressure wheel 5 abutting against the cam 4 is provided on the sliding bolt 3; rotating the adjusting bolt 2 drives the cam 4 to rotate, and the cam 4 pushes the pressure wheel 5 to move.

[0046] The overall structure of the mounting base 1 is U-shaped. Specifically, the mounting base 1 includes a horizontal plate 11, and vertical plates 12 are respectively provided at both ends of the horizontal plate 11. The two vertical plates 12 are arranged in parallel.

[0047] A first through hole 13 is provided on the mounting base 1. Specifically, a first through hole 13 is provided on each of the two vertical plates 12. The adjusting bolt 2 passes through the first through holes 13 on the two vertical plates 12 in sequence and is connected to the adjusting nut 25. A second through hole 41 is provided on the cam 4. The adjusting bolt 2 passes through the second through hole 41, and the cam 4 is located on the second through hole 41. In addition, the adjusting bolt 2 in this application includes a first shaft segment 21, a second shaft segment 22, a third shaft segment 23, and a fourth shaft segment 24. The diameters of the first shaft segment 21, the second shaft segment 22, and the third shaft segment 23 gradually decrease, and the second shaft segment 22 and the third shaft segment 23 are not coaxially arranged. The cross-section of the second shaft segment 22 is triangular. After the adjusting bolt 2 passes through the second through hole 41, the second shaft segment 22 and the third shaft segment 23 cooperate with the second through hole 41, and the cam 4 abuts against the end of the second shaft segment 22. The fourth shaft segment 24 is provided with threads that cooperate with the adjusting nut 25. When adjusting bolt 2 rotates, because the second shaft segment 22 and the third shaft segment 23 are not coaxial, adjusting bolt 2 can drive cam 4 to rotate. The radius of cam 4 gradually increases.

[0048] A sliding groove 14 is also provided on the mounting base 1. Specifically, a sliding groove 14 is provided on both vertical plates 12, and the sliding groove 14 extends through the vertical plates 12. The sliding bolt 3 passes through the sliding groove 14 on the two vertical plates 12 in sequence and is then connected to the sliding bolt 3. A third through hole 51 is provided in the center of the clamping wheel 5. An end ring groove 52 with a diameter larger than the third through hole 51 is provided at both ends of the third through hole 51. A support bearing 6 is provided in the end ring groove 52, and the sliding bolt 3 passes through the support bearing 6. That is to say, two support bearings 6 are provided on the sliding bolt 3, and the two support bearings 6 support the two ends of the clamping wheel 5. The clamping wheel 5 is located on the periphery of the support bearings 6. Thus, the clamping wheel 5 can rotate freely.

[0049] To limit the movement of the clamping roller 5 and prevent it from contacting the vertical plate 12, a support bushing 7 is provided on the sliding bolt 3. The support bushing 7 is located at both ends of the clamping roller 5, and its diameter is smaller than that of the support bearing 6. The two ends of the support bushing 7 abut against the vertical plate 12 and the support bearing 6, respectively.

[0050] An irregularly shaped hole 26 is provided at the end of the adjusting bolt 2. The irregularly shaped hole 26 is non-circular, allowing the adjusting bolt 2 to be rotated using a corresponding wrench, facilitating the change of the support point between the cam 4 and the pressure wheel 5. Furthermore, the uncommon shape of the hole 26 prevents the adjusting bolt 2 from being easily rotated using ordinary tools, thus avoiding accidental human intervention. In this application, the irregularly shaped hole 26 is triangular. A specially designed wrench with a triangular cross-section is used in conjunction with the triangular irregularly shaped hole 26.

[0051] When the adjusting bolt 2 rotates to a certain angle, causing the cam 4 to push the pressure wheel 5 and the transmission belt 8 into contact, thus putting the transmission belt 8 into a tensioned state, the adjusting bolt 2 needs to be fixed. In this embodiment, the adjusting bolt 2 and the adjusting nut 25 are used to fix the adjusting bolt 2 relative to the adjusting nut 25.

[0052] In one embodiment, the adjusting nut 25 has a frosted surface on its side facing the mounting base 1, and the mounting base 1 has a fixing surface that mates with the frosted surface. Both the fixing surface and the frosted surface are made using a frosting process, which can increase the friction between the adjusting nut 25 and the mounting base 1 (vertical plate 12), thereby preventing the adjusting bolt 2 from rotating due to the force transmitted from the tensioning wheel 5 to the cam 4.

[0053] The working principle of this utility model is as follows: The mounting base 1 is installed on the vehicle, so that the pressure roller 5 abuts against the transmission belt 8 on the vehicle. Then, according to the tension of the transmission belt 8, the adjusting bolt 2 is rotated. Due to the different radii of the cams 4, rotating the adjusting bolt 2 changes the radius at the contact point between the cam 4 and the pressure roller 5, thereby pushing the pressure roller 5 to slide along the slide groove 14, thus changing the force exerted by the cam 4 on the pressure roller 5, and realizing the function of adjusting the tension of the transmission belt 8. Since the tension is adjusted by the cam 4 in this application, the radius of the cam 4 gradually changes, thereby realizing continuous adjustment of the tension of the transmission belt 8, so that the transmission belt 8 on each vehicle can reach the optimal tension state.

[0054] Example 2: Referring to Figures 1 to 7, an amphibious vehicle includes the aforementioned cam belt tensioning mechanism. The cam belt tensioning mechanism includes: a mounting base 1, on which an adjusting bolt 2 and a sliding bolt 3 are provided; the adjusting bolt 2 and the sliding bolt 3 are arranged in parallel, and the sliding bolt 3 can slide towards or away from the adjusting bolt 2; a cam 4 is provided on the adjusting bolt 2, and a pressure wheel 5 abutting against the cam 4 is provided on the sliding bolt 3; rotating the adjusting bolt 2 drives the cam 4 to rotate, and the cam 4 pushes the pressure wheel 5 to move.

[0055] The overall structure of the mounting base 1 is U-shaped. Specifically, the mounting base 1 includes a horizontal plate 11, and vertical plates 12 are respectively provided at both ends of the horizontal plate 11. The two vertical plates 12 are arranged in parallel.

[0056] A first through hole 13 is provided on the mounting base 1. Specifically, a first through hole 13 is provided on each of the two vertical plates 12. The adjusting bolt 2 passes through the first through holes 13 on the two vertical plates 12 in sequence and is connected to the adjusting nut 25. A second through hole 41 is provided on the cam 4. The adjusting bolt 2 passes through the second through hole 41, and the cam 4 is located on the second through hole 41. In addition, the adjusting bolt 2 in this application includes a first shaft segment 21, a second shaft segment 22, a third shaft segment 23, and a fourth shaft segment 24. The diameters of the first shaft segment 21, the second shaft segment 22, and the third shaft segment 23 gradually decrease, and the second shaft segment 22 and the third shaft segment 23 are not coaxially arranged. The cross-section of the second shaft segment 22 is triangular. After the adjusting bolt 2 passes through the second through hole 41, the second shaft segment 22 and the third shaft segment 23 cooperate with the second through hole 41, and the cam 4 abuts against the end of the second shaft segment 22. The fourth shaft segment 24 is provided with threads that cooperate with the adjusting nut 25. When adjusting bolt 2 rotates, because the second shaft segment 22 and the third shaft segment 23 are not coaxial, adjusting bolt 2 can drive cam 4 to rotate. The radius of cam 4 gradually increases.

[0057] A sliding groove 14 is also provided on the mounting base 1. Specifically, a sliding groove 14 is provided on both vertical plates 12, and the sliding groove 14 extends through the vertical plates 12. The sliding bolt 3 passes through the sliding groove 14 on the two vertical plates 12 in sequence and is then connected to the sliding bolt 3. A third through hole 51 is provided in the center of the clamping wheel 5. An end ring groove 52 with a diameter larger than the third through hole 51 is provided at both ends of the third through hole 51. A support bearing 6 is provided in the end ring groove 52, and the sliding bolt 3 passes through the support bearing 6. That is to say, two support bearings 6 are provided on the sliding bolt 3, and the two support bearings 6 support the two ends of the clamping wheel 5. The clamping wheel 5 is located on the periphery of the support bearings 6. Thus, the clamping wheel 5 can rotate freely.

[0058] To limit the movement of the clamping roller 5 and prevent it from contacting the vertical plate 12, a support bushing 7 is provided on the sliding bolt 3. The support bushing 7 is located at both ends of the clamping roller 5, and its diameter is smaller than that of the support bearing 6. The two ends of the support bushing 7 abut against the vertical plate 12 and the support bearing 6, respectively.

[0059] An irregularly shaped hole 26 is provided at the end of the adjusting bolt 2. The irregularly shaped hole 26 is non-circular, allowing the adjusting bolt 2 to be rotated using a corresponding wrench, facilitating the change of the support point between the cam 4 and the pressure wheel 5. Furthermore, the uncommon shape of the hole 26 prevents the adjusting bolt 2 from being easily rotated using ordinary tools, thus avoiding accidental human intervention. In this application, the irregularly shaped hole 26 is triangular. A specially designed wrench with a triangular cross-section is used in conjunction with the triangular irregularly shaped hole 26.

[0060] When the adjusting bolt 2 rotates to a certain angle, causing the cam 4 to push the pressure wheel 5 and the transmission belt 8 into contact, thus putting the transmission belt 8 into a tensioned state, the adjusting bolt 2 needs to be fixed. In this embodiment, the adjusting bolt 2 and the adjusting nut 25 are used to fix the adjusting bolt 2 relative to the adjusting nut 25.

[0061] In one embodiment, the adjusting nut 25 has a frosted surface on its side facing the mounting base 1, and the mounting base 1 has a fixing surface that mates with the frosted surface. Both the fixing surface and the frosted surface are made using a frosting process, which can increase the friction between the adjusting nut 25 and the mounting base 1 (vertical plate 12), thereby preventing the adjusting bolt 2 from rotating due to the force transmitted from the tensioning wheel 5 to the cam 4.

[0062] It includes a cam belt tensioning mechanism and a transmission belt 8, with the pressure wheel 5 abutting against the transmission belt 8.

[0063] The working principle of this utility model is as follows: The mounting base 1 is installed on the vehicle, so that the pressure roller 5 abuts against the transmission belt 8 on the vehicle. Then, according to the tension of the transmission belt 8, the adjusting bolt 2 is rotated. Due to the different radii of the cams 4, rotating the adjusting bolt 2 changes the radius at the contact point between the cam 4 and the pressure roller 5, thereby pushing the pressure roller 5 to slide along the slide groove 14, thus changing the force exerted by the cam 4 on the pressure roller 5, and realizing the function of adjusting the tension of the transmission belt 8. Since the tension is adjusted by the cam 4 in this application, the radius of the cam 4 gradually changes, thereby realizing continuous adjustment of the tension of the transmission belt 8, so that the transmission belt 8 on each vehicle can reach the optimal tension state.

[0064] Example 3: This example is similar in structure to Examples 1 and 2, except that the outer wall of the cam 4 has a mounting groove 42 along its outer contour. Several mounting shafts 43, evenly distributed along the outer contour of the cam 4, are arranged within the mounting groove 42. A rotating sleeve shaft 44 is rotatably mounted on each mounting shaft 43. The pressure roller 5 abuts against the rotating sleeve shaft 44, and the rotating sleeve shaft 44 can rotate freely relative to the mounting shaft 43. When the pressure roller 5 rotates, it drives the rotating sleeve shaft 44 to rotate, thereby reducing the frictional force exerted by the pressure roller 5 on the outer wall of the cam 4, making it easier to maintain the fixed position of the cam 4.

[0065] The working principle of this embodiment is as follows: The mounting base 1 is installed on the vehicle, so that the pressure roller 5 abuts against the transmission belt 8 on the vehicle. Then, according to the tension of the transmission belt 8, the adjusting bolt 2 is rotated. Due to the different radii of the cams 4, rotating the adjusting bolt 2 changes the radius at the contact position between the cam 4 and the pressure roller 5, thereby pushing the pressure roller 5 to slide along the slide groove 14, thus changing the force exerted by the cam 4 on the pressure roller 5, and realizing the function of adjusting the tension of the transmission belt 8. During the rotation of the pressure roller 5, it will drive the rotating sleeve shaft 44 to rotate, thereby reducing the friction force from the pressure roller on the cam 4. Since the tension is adjusted by the cam 4 in this application, the radius of the cam 4 gradually changes, thereby realizing continuous adjustment of the tension of the transmission belt 8, so that the transmission belt 8 on each vehicle can reach the optimal tension state.

[0066] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A cam belt tensioning mechanism, characterized in that, include: The mounting base has an adjusting bolt and a sliding bolt. The adjusting bolt and the sliding bolt are arranged in parallel, and the sliding bolt can slide radially along the adjusting bolt. The adjusting bolt has a cam, and the sliding bolt has a clamping wheel that abuts against the cam. Rotating the adjusting bolt drives the cam to rotate, and the cam pushes the clamping wheel to move.

2. The cam belt tensioning mechanism according to claim 1, characterized in that, The mounting base is equipped with a sliding groove, and the sliding bolt passes through the sliding groove.

3. The cam belt tensioning mechanism according to claim 1, characterized in that, The adjusting bolt is equipped with an adjusting nut that mates with it; the mounting base is provided with a first through hole, through which the adjusting bolt passes and connects with the adjusting nut.

4. The cam belt tensioning mechanism according to claim 1, characterized in that, The mounting base includes a horizontal plate and vertical plates arranged parallel to each other at both ends of the horizontal plate. The horizontal plate and the vertical plates work together to form a "U" shaped mounting base.

5. The cam belt tensioning mechanism according to any one of claims 1 to 4, characterized in that, An irregularly shaped hole is provided at the end of the adjusting bolt.

6. The cam belt tensioning mechanism according to any one of claims 1 to 4, characterized in that, A support bearing is provided on the sliding bolt, and a clamping wheel is located on the periphery of the support bearing.

7. The cam belt tensioning mechanism according to claim 6, characterized in that, Support bushings are provided on the sliding bolts, and the support bushings are located at both ends of the clamping wheel.

8. The cam belt tensioner of claim 3 wherein, The adjusting bolt has a frosted surface on the side facing the mounting base, and the mounting base has a fixing surface that mates with the frosted surface.

9. An amphibious vehicle, characterized in that, Includes the cam belt tensioning mechanism as described in any one of claims 1 to 8.

10. The amphibious vehicle according to claim 9, characterized in that, It also includes a drive belt, with the pressure roller abutting against the drive belt.

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