A bicycle CVT belt drive adjustment structure
Patent Information
- Application Number
- CN202521805035.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-08-25
AI Technical Summary
然而，上述设计对车架的精度要求非常高，制造过程繁冗，结构复杂，导致生产成本较大
[0020] This utility model provides an adjustment structure for a bicycle CVT belt drive. The bicycle includes a drive wheel and a driven wheel, with a CVT belt drivingly connecting their surfaces. The adjustment structure includes a frame, a guide wheel assembly, and a mounting assembly. The frame is mounted on the bicycle frame and has an adjustment slot. The guide wheel assembly includes a guide wheel body, the wheel surface of which can contact the CVT belt for tensioning. The mounting assembly has the adjustment slot and is detachably mounted to the frame. The guide wheel assembly is rotatably connected to the mounting assembly. This design, using a mounting assembly to achieve adjustable mounting of the guide wheel assembly relative to the frame, enables tensioning and alignment of the CVT belt, simplifies the overall structure and manufacturing process, saves production costs, and facilitates operation and maintenance for the rider.
Smart Images
Figure CN224715160U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bicycle transmission system technology, and in particular to an adjustment structure for a bicycle CVT belt drive. Background Technology
[0002] Belt drives are widely used in bicycles due to their advantages such as smooth transmission, low noise, low maintenance costs, wide speed range, high transmission efficiency, and good reliability. In the belt drive structure design of traditional bicycle CVTs, the drive wheel and driven wheel are designed with an adjustable center distance, and a long hole or slider mechanism is used to achieve coarse adjustment of belt tension. This design usually requires multiple long holes on the frame to provide sufficient movement space during adjustment. The slider mechanism is implemented through a sliding connector, allowing the belt tension to be initially adjusted according to actual needs. Alternatively, the frame rear fork uses a sliding hook design, which changes the position of the rear wheel by moving the hook forward and backward to achieve dynamic adjustment of belt tension. This design requires a sliding hook to be installed at the rear of the frame and ensure that it can move freely within a certain range. In addition, to ensure the accuracy of the adjustment, positioning bolts or scale markings are usually used to ensure that each adjustment achieves the expected effect. However, the above designs have very high precision requirements for the frame, the manufacturing process is cumbersome, the structure is complex, resulting in high production costs. At the same time, due to the need for frequent adjustments, maintenance and operation are relatively cumbersome, increasing the difficulty for riders.
[0003] Therefore, there is an urgent need for an adjustment structure for bicycle CVT belt drives to solve the above problems. Utility Model Content
[0004] The purpose of this invention is to provide an adjustment structure for a bicycle CVT belt drive, which can effectively simplify the overall structure and manufacturing process, save production costs, and facilitate the operation and maintenance of the driver.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] This utility model provides an adjustment structure for a CVT belt drive in a bicycle. The bicycle includes a drive wheel and a driven wheel, and a CVT belt is drivingly connected to the surfaces of the drive wheel and the driven wheel. The adjustment structure for the CVT belt drive in the bicycle includes:
[0007] A frame, which is mounted on a vehicle frame, and the frame is provided with adjustment slots;
[0008] A guide wheel assembly, the guide wheel assembly including a guide wheel body, the wheel surface of the guide wheel body being able to contact the CVT belt for tensioning;
[0009] The mounting assembly is capable of passing through the adjustment slot and is detachably mounted on the frame, and the guide wheel assembly is rotatably connected to the mounting assembly.
[0010] As a preferred technical solution of the above-mentioned adjustment structure of bicycle CVT belt drive, the guide wheel assembly includes a first bearing and a first cover plate. The outer ring of the first bearing is fixedly installed in the guide wheel body, the first cover plate covers one side of the guide wheel body, and the first cover plate is fixedly connected to the inner ring of the first bearing.
[0011] As a preferred technical solution for the adjustment structure of the above-mentioned bicycle CVT belt drive, the guide wheel assembly further includes a second bearing and a second cover plate. The outer ring of the second bearing is fixedly installed in the guide wheel body, and the second cover plate covers the other side of the guide wheel body and is fixedly connected to the inner ring of the second bearing.
[0012] As a preferred technical solution for the adjustment structure of the above-mentioned bicycle CVT belt drive, the mounting assembly includes a screw and a nut. The screw passes through the guide wheel assembly and the adjustment slot in sequence and is threaded to the nut.
[0013] As a preferred technical solution for the adjustment structure of the above-mentioned bicycle CVT belt drive, the mounting assembly further includes a positioning plate, which abuts against the frame and the second cover plate. The screw passes through the guide wheel assembly, the positioning plate and the adjustment slot in sequence, and is threaded to the nut.
[0014] As a preferred technical solution for the adjustment structure of the above-mentioned bicycle CVT belt drive, the nut is T-shaped.
[0015] As a preferred technical solution for the adjustment structure of the above-mentioned bicycle CVT belt drive, the bicycle also includes a frame rear fork, which has a left arm and a right arm. The left arm and the right arm are designed asymmetrically to form a high-low foot structure, so that a clearance space is formed between the left arm and the right arm for the CVT belt to pass through and be assembled.
[0016] As a preferred technical solution of the above-mentioned bicycle CVT belt drive adjustment structure, the bicycle CVT belt drive adjustment structure further includes a first connecting member, and the frame is also provided with a first mounting hole. The first connecting member passes through the first mounting hole and is fastened to the frame.
[0017] As a preferred technical solution for the above-mentioned bicycle CVT belt drive adjustment structure, the bicycle CVT belt drive adjustment structure further includes a second connecting member, and the frame is also provided with a second mounting hole. The second connecting member passes through the second mounting hole and is fastened to the frame.
[0018] As a preferred technical solution for the adjustment structure of the above-mentioned bicycle CVT belt drive, both the first connecting member and the second connecting member are bolts.
[0019] The beneficial effects of this utility model are as follows:
[0020] This utility model provides an adjustment structure for a bicycle CVT belt drive. The bicycle includes a drive wheel and a driven wheel, with a CVT belt drivingly connecting their surfaces. The adjustment structure includes a frame, a guide wheel assembly, and a mounting assembly. The frame is mounted on the bicycle frame and has an adjustment slot. The guide wheel assembly includes a guide wheel body, the wheel surface of which can contact the CVT belt for tensioning. The mounting assembly has the adjustment slot and is detachably mounted to the frame. The guide wheel assembly is rotatably connected to the mounting assembly. This design, using a mounting assembly to achieve adjustable mounting of the guide wheel assembly relative to the frame, enables tensioning and alignment of the CVT belt, simplifies the overall structure and manufacturing process, saves production costs, and facilitates operation and maintenance for the rider. Attached Figure Description
[0021] Figure 1 An exploded view of the adjustment structure of the bicycle CVT belt drive provided by this utility model;
[0022] Figure 2 Structural diagram of the bicycle provided by this utility model Figure 1 ;
[0023] Figure 3 for Figure 2 A magnified view of part A in the middle;
[0024] Figure 4 Structural diagram of the bicycle provided by this utility model Figure 2 ;
[0025] Figure 5 for Figure 4 A magnified view of part B in the middle section.
[0026] in:
[0027] 1. CVT belt;
[0028] 2. Frame; 21. Adjustment slot; 22. First mounting hole; 23. Second mounting hole;
[0029] 3. Guide wheel body; 4. First bearing; 5. First cover plate; 6. Second bearing; 7. Second cover plate; 8. Screw; 9. Nut; 10. Positioning piece; 11. First connecting piece; 12. Second connecting piece. Detailed Implementation
[0030] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.
[0032] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0035] like Figures 1 to 5 As shown, this embodiment provides an adjustment structure for a bicycle CVT belt drive. The bicycle includes a drive wheel and a driven wheel, with a CVT belt 1 drivingly connected to the surfaces of the drive wheel and the driven wheel. The adjustment structure for the bicycle CVT belt drive includes a frame 2, a guide wheel assembly, and a mounting assembly. The frame 2 is mounted on the bicycle frame and has an adjustment slot 21. The guide wheel assembly includes a guide wheel body 3, the surface of which can contact the CVT belt 1 for tensioning. The mounting assembly can pass through the adjustment slot 21 and is detachably mounted to the frame 2. The guide wheel assembly is rotatably connected to the mounting assembly. This configuration uses a mounting assembly to achieve an adjustable mounting method for the guide wheel assembly relative to the frame 2, thereby achieving tensioning and alignment of the CVT belt 1, simplifying the overall structure and manufacturing process, saving production costs, and facilitating operation and maintenance by the rider.
[0036] It should be noted that the bicycle CVT belt drive adjustment structure provided in this embodiment adopts an eccentric structure. This eccentric structure is configured such that its motion trajectory is an elliptical trajectory. The range of the major and minor semi-axles of this elliptical trajectory is set to accommodate the installation position deviation caused by the frame manufacturing tolerance. In actual design, the frame manufacturing tolerance is first calculated, the elliptical trajectory of the stroke is drawn, and the range that can be completely contained within the major and minor semi-axles is selected respectively. This reduces the frame manufacturing precision and production cost, that is, the adjustable range can be captured by the calculated motion trajectory, increasing the integrable range. At the same time, the bicycle CVT belt drive adjustment structure adopts a two-part structure of frame 2 and "guide wheel assembly + mounting assembly" to realize the change of track between the major and minor semi-axles. Furthermore, it can also be integrated with the motor fixing point to further improve quality and precision.
[0037] Specifically, this embodiment provides the following technical solution: In order to better support the rotation of the guide wheel body 3, reduce friction, and ensure its operational accuracy and efficiency, the guide wheel assembly also includes a first bearing 4, a first cover plate 5, a second bearing 6, and a second cover plate 7. The outer ring of the first bearing 4 is fixedly installed inside the guide wheel body 3. The first cover plate 5 covers one side of the guide wheel body 3 and is fixedly connected to the inner ring of the first bearing 4. The outer ring of the second bearing 6 is fixedly installed inside the guide wheel body 3. The second cover plate 7 covers the other side of the guide wheel body 3 and is fixedly connected to the inner ring of the second bearing 6.
[0038] Optionally, for ease of disassembly and operation, the mounting assembly includes a screw 8 and a nut 9. The screw 8 passes through the guide wheel assembly and the adjustment slot 21 in sequence and is threaded to the nut 9. Further, the mounting assembly also includes a positioning piece 10, which abuts against the frame 2 and the second cover plate 7. The screw 8 passes through the guide wheel assembly, the positioning piece 10, and the adjustment slot 21 in sequence and is threaded to the nut 9.
[0039] Specifically, the nut 9 is T-shaped. With this configuration, the T-shaped nut 9 has a vertically connected support and a connecting part. The connecting part is inserted into the adjustment slot 21 and threadedly connected to the screw 8, while the support part abuts against and fits against the surface of the frame 2. This can greatly improve the stability and reliability of the connection.
[0040] Optionally, to facilitate a smoother assembly process, the bicycle also includes a rear fork with a left and right arm. The left and right arms are asymmetrically designed to create a high-low configuration, allowing space between them for the CVT belt 1 to pass through and be assembled. This high-low configuration breaks the symmetry of the rear fork, with one arm higher than the other, essentially creating a larger, laterally open opening. This facilitates assembly, reduces interference and friction losses, and optimizes the distribution of function and performance.
[0041] In this embodiment, the adjustment structure of the bicycle CVT belt drive further includes a first connecting member 11 and a second connecting member 12. The frame 2 also has a first mounting hole 22, through which the first connecting member 11 passes and is securely connected to the frame. The frame 2 also has a second mounting hole 23, through which the second connecting member 12 passes and is securely connected to the frame. Furthermore, both the first connecting member 11 and the second connecting member 12 are bolts.
[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. An adjustment structure for a CVT belt drive in a bicycle, the bicycle comprising a drive wheel and a driven wheel, wherein a CVT belt (1) is drivingly connected to the surfaces of the drive wheel and the driven wheel, characterized in that, The adjustment structure of the bicycle CVT belt drive includes: A frame (2) is mounted on a vehicle frame, and the frame (2) is provided with an adjustment slot (21); A guide wheel assembly, the guide wheel assembly including a guide wheel body (3), the wheel surface of the guide wheel body (3) being able to contact the CVT belt (1) for tensioning; The mounting assembly is capable of passing through the adjustment slot (21) and is detachably mounted on the frame (2), and the guide wheel assembly is rotatably connected to the mounting assembly.
2. The adjustment structure for bicycle CVT belt drive according to claim 1, characterized in that, The guide wheel assembly also includes a first bearing (4) and a first cover plate (5). The outer ring of the first bearing (4) is fixedly installed inside the guide wheel body (3). The first cover plate (5) covers one side of the guide wheel body (3) and is fixedly connected to the inner ring of the first bearing (4).
3. The adjustment structure for bicycle CVT belt drive according to claim 2, characterized in that, The guide wheel assembly also includes a second bearing (6) and a second cover plate (7). The outer ring of the second bearing (6) is fixedly installed inside the guide wheel body (3). The second cover plate (7) covers the other side of the guide wheel body (3) and is fixedly connected to the inner ring of the second bearing (6).
4. The adjustment structure for bicycle CVT belt drive according to claim 3, characterized in that, The mounting assembly includes a screw (8) and a nut (9). The screw (8) passes through the guide wheel assembly and the adjustment slot (21) in sequence and is threaded to the nut (9).
5. The adjustment structure for a bicycle CVT belt drive according to claim 4, characterized in that, The mounting assembly also includes a positioning piece (10), which abuts against the frame (2) and the second cover plate (7). The screw (8) passes through the guide wheel assembly, the positioning piece (10) and the adjustment slot (21) in sequence, and is threaded to the nut (9).
6. The adjustment structure for a bicycle CVT belt drive according to claim 4, characterized in that, The nut (9) is T-shaped.
7. The adjusting structure for a bicycle CVT belt drive according to any one of claims 1-6, characterized in that, The bicycle also includes a frame rear fork, which has a left arm and a right arm. The left arm and the right arm are designed asymmetrically to form a high-low leg structure, so that a clearance space is formed between the left arm and the right arm for the CVT belt (1) to pass through and be assembled.
8. The adjusting structure for a bicycle CVT belt drive according to any one of claims 1-6, characterized in that, The adjustment structure of the bicycle CVT belt drive also includes a first connector (11), and the frame (2) is also provided with a first mounting hole (22). The first connector (11) passes through the first mounting hole (22) and is fastened to the frame.
9. The adjustment structure for a bicycle CVT belt drive according to claim 8, characterized in that, The adjustment structure of the bicycle CVT belt drive also includes a second connector (12), and the frame (2) is also provided with a second mounting hole (23). The second connector (12) passes through the second mounting hole (23) and is fastened to the frame.
10. The adjustment structure for a bicycle CVT belt drive according to claim 9, characterized in that, Both the first connector (11) and the second connector (12) are bolts.