Chain wheel tensioning adjusting mechanism of dune buggy frame

Abstract

The utility model discloses a chain wheel tension adjusting mechanism of a dune buggy frame. The chain wheel tension adjusting mechanism comprises a frame assembly, a chain wheel system is arranged on the frame assembly, a front wheel system is arranged at the front end of the frame, a rear wheel system is arranged at the rear end of the frame, and a brake system is arranged on the rear wheel system. The rear axle eccentric cylinder is mounted on a rear axle shaft of the rear wheel system, and the rear axle eccentric cylinder and the rear axle shaft are rotationally assembled; the fixing cylinder is installed outside the rear axle eccentric cylinder, the fixing cylinder and the frame assembly are fixedly installed, and the fixing cylinder is used for wrapping the rear axle eccentric cylinder and limiting rotation of the rear axle eccentric cylinder in the circumferential direction; the eccentric cylinder and the fixed cylinder are connected in a sleeved mode, a simple locking mechanism and a bearing support are matched, a complex sliding rail or a multi-section screw device is not needed, functionality is guaranteed, meanwhile, the number of parts is reduced, production, manufacturing and later maintenance are facilitated, and the tension degree of a chain wheel system is convenient to adjust.

Description

Technical Field

[0001] This utility model relates to the field of beach buggies, specifically to a sprocket tensioning adjustment mechanism for a beach buggy frame. Background Technology

[0002] ATVs (All-Terrain Vehicles) are specialized vehicles capable of traversing various terrains and are widely used in recreational activities, agricultural and forestry operations, and off-road racing. During operation, the chain drive system plays a crucial role in power transmission, and the chain tension directly affects the vehicle's transmission efficiency, stability, and lifespan.

[0003] Currently, most beach buggy chainring systems rely on moving the rear axle or installing a sliding rail to adjust chain tension. This type of structure often has the following drawbacks:

[0004] In existing technologies, most chain tensioning mechanisms require the use of tools to loosen multiple fixing bolts, manual pushing or fine-tuning of the rear wheel position, and then retightening the bolts. The entire process is cumbersome, time-consuming, and has low adjustment efficiency.

[0005] Traditional structures often use sliding adjustment or limit hole adjustment, which are limited by the precision of the structure processing and the adjustment method. This can easily lead to problems such as incomplete adjustment or uneven chain tension, affecting the transmission performance.

[0006] To achieve adjustability, some structures incorporate multiple sliders, guide rails, or multi-segment screws, which increases the number of parts, makes them prone to wear, and makes maintenance difficult. Summary of the Invention

[0007] To address the aforementioned issues, this invention provides a sprocket tensioning adjustment mechanism for a beach buggy frame. This mechanism is simple in structure, easy to adjust, and offers high tensioning accuracy, thereby improving the overall usability and transmission reliability of the vehicle.

[0008] This utility model is achieved through the following technical solution: a sprocket tensioning adjustment mechanism for a beach buggy frame, comprising:

[0009] A frame assembly, on which a sprocket system is provided, a front wheel system is provided at the front end of the frame, a rear wheel system is provided at the rear end of the frame, and a braking system is provided on the rear wheel system;

[0010] The rear axle eccentric cylinder is mounted on the rear wheel axle of the rear wheel system, and the rear axle eccentric cylinder is rotatably assembled with the rear wheel axle;

[0011] A fixing cylinder is installed outside the rear axle eccentric cylinder and is fixedly installed to the frame assembly. The fixing cylinder is used to wrap around the rear axle eccentric cylinder and restrict its circumferential rotation.

[0012] The driven sprocket of the sprocket system is mounted on the rear wheel axle. The driven sprocket rotates synchronously with the rear wheel axle. When the rear axle eccentric cylinder rotates coaxially with the rear wheel axle, the tension of the sprocket system is adjusted by the displacement between the rear axle eccentric cylinder and the fixed cylinder.

[0013] As a preferred technical solution, one end of the fixed cylinder is open, and fixed ears are provided on both the upper and lower surfaces of the fixed cylinder opening. A locking screw is installed through the fixed ear. When it is necessary to adjust the tension of the sprocket system, the locking screw is loosened.

[0014] As a preferred technical solution, the rear axle eccentric cylinder has an eccentric arc surface, and the end face of the rear axle eccentric cylinder is provided with multiple limiting holes. The driven sprocket is provided with multiple waist-shaped holes around the driven sprocket. When it is necessary to adjust the tension of the sprocket system, a locking wrench is inserted through the waist-shaped hole and into the limiting hole. When the rear wheel system rolls, the locking wrench causes the rear axle eccentric cylinder to follow the rear wheel axle in synchronous circular motion.

[0015] As a preferred technical solution, a support bearing is provided at the mounting position of the rear axle eccentric cylinder and the rear wheel axle.

[0016] As a preferred technical solution, the sprocket system further includes a driving sprocket and a chain, with the chain installed between the driving sprocket and the driven sprocket.

[0017] As a preferred technical solution, the fixed cylinder is provided with an opening window on the side with the opening.

[0018] As a preferred technical solution, a rear shock absorption system is also included, which is mounted on the frame assembly of the rear wheel system.

[0019] The beneficial effects of this utility model are: by setting up a rear axle eccentric cylinder structure and utilizing its eccentric rotation characteristics relative to the fixed cylinder, this utility model can achieve rapid adjustment of the tension of the sprocket system. Users only need to loosen the locking screw and rotate the rear wheel to drive the eccentric cylinder to rotate synchronously to complete the tensioning or loosening operation. There is no need to move the entire rear wheel axle or use multiple tools, which greatly improves the adjustment efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0022] Figure 2 This utility model Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0024] Figure 4 This is a partial cross-sectional schematic diagram of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the fixing cylinder of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the rear axle eccentric cylinder of this utility model;

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Frame assembly; 3. Braking system; 4. Rear axle eccentric cylinder; 6. Rear wheel axle; 2. Fixed cylinder; 5. Driven sprocket; 23. Locking screw; 10. Limiting hole; 9. Waist-shaped hole; 12. Support bearing; 8. Chain; 21. Opening window; 7. Rear shock absorption system; 22. Fixed lug. Detailed Implementation

[0029] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0030] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0031] like Figures 1-6 As shown, the specific implementation of the sprocket tension adjustment mechanism for a beach buggy frame according to this utility model is as follows:

[0032] The sprocket tensioning adjustment mechanism of this utility model is applied to beach buggies with chain drive structures and is integrally mounted on the frame assembly 1. The front wheel system is mounted at the front end of the frame assembly 1, and the rear wheel system is mounted at the rear end. The rear wheel system is equipped with a braking system 3 to achieve braking control of the entire vehicle. The sprocket system includes a driving sprocket, a driven sprocket 5, and a chain 8 connecting the two. The driving sprocket is typically located on the power output shaft, and the driven sprocket 5 is located on the rear wheel axle 6. The chain 8 forms a closed power transmission path around both.

[0033] To facilitate the adjustment of the sprocket system tension, this embodiment includes a rear axle eccentric cylinder 4. This rear axle eccentric cylinder 4 is mounted on the rear wheel axle 6 of the rear wheel system and is rotatably assembled with the rear wheel axle 6, meaning the rear wheel axle 6 can rotate relative to the rear axle eccentric cylinder 4. The rear axle eccentric cylinder 4 is externally encased in a fixed cylinder 2, which is fixedly connected to the frame assembly 1 by bolts or welding, thereby restricting the free rotation of the eccentric cylinder in the circumferential direction. In other words, the fixed cylinder 2 is a stationary component, while the eccentric cylinder can rotate with the axle after the fixed state is released.

[0034] like Figure 6 As shown, the outer contour of the rear axle eccentric cylinder 4 is an eccentric circle, and its central axis is offset from the axis of the rear wheel axle 6. This eccentric structure design causes the outer diameter contour of the eccentric cylinder to be displaced relative to the fixed cylinder 2 when the eccentric cylinder rotates around the rear wheel axle 6, thereby causing the entire rear wheel system to be slightly displaced relative to the frame, thus changing the tension of the chain 8.

[0035] To facilitate adjustment, one end of the fixed cylinder 2 is designed as an open structure, with fixed ears 22 welded to the upper and lower sides of the opening, and locking screws 23 passing through the fixed ears 22. When it is necessary to adjust the tension of the chain 8, the user only needs to loosen the locking screws 23, which disengages the locking of the fixed cylinder 2 onto the eccentric cylinder, allowing the eccentric cylinder to rotate freely. After adjustment, the locking screws 23 are tightened again to fix the eccentric cylinder in the new angular position, thereby maintaining the tension of the chain 8 after adjustment.

[0036] To facilitate operation and control during the adjustment process, in this embodiment, as follows: Figure 6 As shown, several limiting holes 10 are provided on the end face of the rear axle eccentric cylinder 4, and several oblong holes 9 are provided circumferentially on the driven sprocket 5 that cooperates with it. The user can insert a locking wrench through the oblong holes 9 and into the limiting holes 10, thereby driving the rear wheel system to rotate and realize the rotation of the eccentric cylinder relative to the fixed cylinder 2, thus controlling the change of the eccentric position and realizing the tensioning or loosening of the chain 8. Since the combination of limiting holes 10 and oblong holes 9 provides multiple angle adjustment points, the adjustment position is more flexible;

[0037] The reason for inserting a wrench during adjustment is to ensure that the rear axle eccentric cylinder 4 rotates coaxially with the rear wheel axle 6. Since the rear axle eccentric cylinder 4 and the rear wheel axle 6 are rotatably connected, we must ensure that they rotate coaxially during adjustment. Because the driven sprocket 5 is fixed on the rear wheel axle 6, when the wrench is inserted into the limiting hole 10 through the oblong hole, initially, the rear wheel axle 6 will rotate relative to the rear axle eccentric cylinder 4. At this time, the rear axle eccentric cylinder 4 will not rotate circumferentially until the wrench moves to the extreme position on one side of the oblong hole. When the rear wheel axle 6 continues to rotate, due to the limitation of the wrench, the rear axle eccentric cylinder 4 can only rotate circumferentially with the rear wheel axle 6. After the rear axle eccentric cylinder 4 rotates relative to the fixed cylinder 2, its eccentric structure can be used to achieve the tensioning of the chain 8.

[0038] like Figure 4 As shown, in order to ensure the relative rotation between the eccentric cylinder and the rear wheel axle 6 is stable and reliable, a support bearing 12 is provided at the joint position of the two. The support bearing 12 can absorb the radial load during rotation and reduce the rotational resistance, thereby improving the smoothness and durability of the adjustment operation.

[0039] In the sprocket system, the driving sprocket is mounted on the engine output shaft, while the driven sprocket 5 is integrally connected to the rear axle 6. The chain 8 is tightly fitted between the two, forming a closed power transmission path. This structure indirectly changes the tension of the chain 8 by adjusting the position of the driven sprocket 5, thereby ensuring the normal transmission efficiency of the entire vehicle.

[0040] On one side of the opening of the fixed cylinder 2, there is also an opening window 21 structure. This structure facilitates observation of the position of the eccentric cylinder, further improving the convenience of maintenance and adjustment. Figure 5 As shown.

[0041] In addition, this structure is equipped with a rear shock absorption system 7, which is installed between the frame assembly 1 and the rear wheel system to absorb impact loads from the ground and improve the overall comfort and off-road performance of the vehicle.

[0042] This invention enables rapid adjustment of the tension of the sprocket system. The entire adjustment process only requires loosening the locking screw 23, and the rear axle eccentric cylinder 4 can be driven to rotate synchronously by rolling the rear wheel, thereby completing the operation of tensioning or loosening the chain 8.

[0043] Compared to the traditional method of moving the entire rear axle 6 or adjusting the position of the tie rod, this structure eliminates the need to disassemble large components or perform frequent calibrations, greatly simplifying the adjustment process and improving operational efficiency and practicality.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A sprocket tensioning adjustment mechanism for a beach buggy frame, characterized in that, include: A frame assembly (1) is provided with a sprocket system, a front wheel system is provided at the front end of the frame, a rear wheel system is provided at the rear end of the frame, and a braking system (3) is provided on the rear wheel system. The rear axle eccentric cylinder (4) is installed on the rear wheel axle (6) of the rear wheel system, and the rear axle eccentric cylinder (4) is rotatably assembled with the rear wheel axle (6); Fixed cylinder (2), the fixed cylinder (2) is installed on the outside of the rear axle eccentric cylinder (4), the fixed cylinder (2) is fixedly installed with the frame assembly (1), the fixed cylinder (2) is used to wrap the rear axle eccentric cylinder (4) and restrict its circumferential rotation; The driven sprocket (5) of the sprocket system is mounted on the rear wheel axle (6). The driven sprocket (5) rotates synchronously with the rear wheel axle (6). When the rear axle eccentric cylinder (4) rotates coaxially with the rear wheel axle (6), the tension of the sprocket system is adjusted by the displacement between the rear axle eccentric cylinder (4) and the fixed cylinder (2).

2. The sprocket tensioning adjustment mechanism of the beach buggy frame according to claim 1, characterized in that: One end of the fixed cylinder (2) is open, and fixed ears (22) are provided on both the upper and lower surfaces of the opening of the fixed cylinder (2). A locking screw (23) is provided through the fixed ear (22). When it is necessary to adjust the tension of the sprocket system, the locking screw (23) is loosened.

3. The sprocket tensioning adjustment mechanism of the beach buggy frame according to claim 1, characterized in that: The rear axle eccentric cylinder (4) has an eccentric arc surface. The end face of the rear axle eccentric cylinder (4) is provided with multiple limiting holes (10). Multiple waist-shaped holes (9) are provided around the driven sprocket (5). When it is necessary to adjust the tension of the sprocket system, a locking wrench is inserted through the waist-shaped hole and into the limiting hole (10). When the rear wheel system rolls, the locking wrench causes the rear axle eccentric cylinder (4) to follow the rear wheel axle (6) in synchronous circular motion.

4. The sprocket tensioning adjustment mechanism of the beach buggy frame according to claim 1, characterized in that: The rear axle eccentric cylinder (4) and the rear wheel axle (6) are provided with a support bearing (12).

5. The sprocket tensioning adjustment mechanism of the beach buggy frame according to claim 1, characterized in that: The sprocket system also includes a drive sprocket and a chain (8), the chain (8) being installed between the drive sprocket and the driven sprocket (5).

6. The sprocket tensioning adjustment mechanism of the beach buggy frame according to claim 2, characterized in that: The fixed cylinder (2) has an opening window (21) on the side with the opening.

7. The sprocket tensioning adjustment mechanism of the beach buggy frame according to claim 1, characterized in that: It also includes a rear shock absorber system (7), which is mounted on the frame assembly (1) of the rear wheel system.

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