Five-way adjusting device of electric bicycle

Abstract

The utility model relates to a five-way adjusting device of an electric bicycle, which comprises a five-way, a five-way adjusting support and a main body frame, the five-way is mounted on the five-way adjusting support, and the five-way adjusting support is detachably connected below one side of the main body frame; a plurality of screw hole positions are formed in the main body frame in the height direction, and a plurality of fixing holes matched with the screw hole positions are formed in the five-way adjusting support; and the screw hole positions and the fixing holes are locked and fixed through screws, so that the height of the bottom bracket on the main body frame is adjusted. The height of the bottom bracket can be flexibly adjusted and stably locked, the adaptability of the electric bicycle to users with different heights is remarkably improved, the riding posture comfort and the power generation efficiency are optimized, meanwhile, it is ensured that the adjusting process is simple, convenient and reliable, the maintenance cost is reduced, and the service life of the frame is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle technology, and in particular to a five-way adjustment device for an electric bicycle. Background Technology

[0002] In today's electric bicycle market, optimizing the riding experience remains a key focus for industry development. The bottom bracket, a crucial component connecting the crankset and frame, directly impacts the rider's leg extension, torso lean angle, and overall riding posture, thus profoundly affecting the rider's riding comfort and health.

[0003] Currently, most electric bicycles on the market use a fixed bottom bracket design, meaning the bottom bracket is welded to or integrally formed with the frame. This traditional design reveals significant limitations when facing a diverse range of riders. Riders of different heights have varying leg lengths, posture habits, and power exertion methods. For taller riders, a fixed and relatively low bottom bracket height prevents them from fully extending their legs during riding, leading to excessive knee bending. Prolonged exposure to this posture not only causes rapid muscle fatigue in the legs but also increases pressure on the knee joints, potentially leading to knee injuries over time. Conversely, shorter riders, facing an excessively high bottom bracket height, find it difficult to comfortably reach the pedals. To maintain riding, they are forced to frequently adjust their posture, resulting in a distorted riding posture. This not only reduces riding comfort but also distracts the rider, increasing safety risks.

[0004] Furthermore, improper riding posture can directly affect riding efficiency and power transmission. When the rider's body is not in a natural and comfortable posture for exerting force, the muscles cannot effectively transfer power to the pedals, resulting in increased energy loss during riding and affecting the electric bicycle's range.

[0005] Although the fixed bottom bracket design in existing technology ensures the stability of the frame structure, the non-adjustable bottom bracket height of electric bicycles severely limits the adaptability of the vehicle to users of different heights and different riding scenarios, resulting in uncomfortable riding posture, reduced comfort, and may even cause riding fatigue or sports injuries. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a five-way adjustment device for electric bicycles, which enables flexible adjustment and stable locking of the five-way height, significantly improving the adaptability of electric bicycles to users of different heights, optimizing riding posture comfort and power generation efficiency, while ensuring that the adjustment process is simple and reliable, reducing maintenance costs and extending the service life of the frame.

[0007] The above-mentioned utility model objective is achieved through the following technical solution:

[0008] A bottom bracket adjustment device for an electric bicycle includes a bottom bracket, a bottom bracket adjustment bracket, and a main frame.

[0009] The bottom bracket is mounted on the bottom bracket adjustment bracket, which is detachably connected to the lower side of the main frame. The main frame has multiple screw holes along the height direction, and the bottom bracket adjustment bracket has multiple fixing holes that match the screw holes. The screw holes and fixing holes are locked in place by screws, thereby achieving height adjustment of the bottom bracket on the main frame.

[0010] The above technical solution allows for flexible adjustment of the bottom bracket height through the combination of screw holes and fixing holes, thereby optimizing riding posture and improving riding comfort. In addition, the detachable structure of each component enables quick installation and reduces maintenance costs and difficulty.

[0011] As a further technical solution of this utility model: the bottom side of the main frame is integrally formed and fixedly connected with a guide boss, and grooves are provided on the upper part of both sides of the guide boss. The five-way adjustment bracket is provided with guide plates that match the grooves on both sides. The guide boss slides between the two guide plates along the height direction of the main frame.

[0012] The above technical solution allows the guide boss to slide along the height direction of the main frame within the space formed by the guide boss, providing precise guidance for the height adjustment of the bottom bracket, enhancing connection stability, and reducing shaking during riding.

[0013] As a further technical solution of this utility model: the multiple screw holes opened on the main frame are evenly distributed along the height adjustment direction of the bottom bracket.

[0014] The above technical solution enables the evenly distributed screw holes to make the height adjustment of the bottom bracket more precise, ensuring the stability of the adjustment, while making the force more balanced and avoiding local stress concentration.

[0015] As a further technical solution of this utility model: multiple screw holes are symmetrically opened on both sides of the guide boss along the height direction.

[0016] The above technical solution allows the symmetrically opened screw holes to ensure that the force on both sides of the bottom bracket is balanced when it is fixed to the main frame, making the structure more stable.

[0017] As a further technical solution of this utility model: a plurality of fixing holes are symmetrically opened on both sides of the five-way adjusting bracket along the height direction, and the fixing holes respectively penetrate the inner walls of both sides of the five-way adjusting bracket.

[0018] Through the above technical solution, multiple fixing holes are symmetrically opened on both sides of the guide plate and penetrate its inner wall, so that the force is evenly and symmetrically distributed when the bottom bracket is connected to the main frame, effectively avoiding structural deformation and enhancing connection strength. At the same time, the symmetrical layout and through design facilitate installation positioning and height adjustment, reduce installation errors, improve adjustment efficiency, ensure that the device is stable and does not loosen during riding, and ensure riding safety.

[0019] As a further technical solution of this utility model, it also includes a crankset, a right crank pedal and a left crank pedal. The crankset is fixedly connected to one end of the bottom bracket, one side of the crankset is fixedly connected to the right crank, and the other end of the bottom bracket is fixedly connected to the left crank pedal.

[0020] The above technical solution establishes a stable and continuous power transmission link, which can simultaneously change the position of the chainring and pedals when adjusting the bottom bracket height, always maintaining optimal power transmission efficiency and improving riding comfort. At the same time, this connection method enhances the structural strength of the entire bottom bracket adjustment device, distributes and bears the force and torque during riding, reduces component wear and fatigue, extends the service life of each component, and reduces operating costs.

[0021] As a further technical solution of this utility model: after the screw passes through the fixing hole on the bottom bracket, it is inserted into the screw hole corresponding to the fixing hole, and the bottom bracket and the main frame are locked by threaded connection, so as to fix the bottom bracket at different adjustment height positions on the main frame.

[0022] The above technical solution uses screws and fixing holes, and screw hole positions to reliably fix the bottom bracket adjustment bracket to the main frame, ensuring the bottom bracket is stable and does not loosen at different height positions while maintaining adjustment flexibility.

[0023] In summary, this utility model has at least one of the following beneficial technical effects:

[0024] 1. This utility model discloses a bottom bracket adjustment device for electric bicycles, which achieves rapid and precise adjustment of the bottom bracket height of electric bicycles through a detachable connection structure and a multi-position screw hole and fixing hole matching design, adapting to the riding posture needs of users of different heights and improving riding comfort.

[0025] 2. This utility model discloses a bottom bracket adjustment device for an electric bicycle, which achieves stable guidance and precise positioning of the bottom bracket adjustment bracket during height adjustment through a sliding fit structure of a guide cam and a guide boss, ensuring the stability and reliability of the adjustment process;

[0026] 3. This utility model discloses a bottom bracket adjustment device for an electric bicycle, which is fixedly connected to the chainring and the pedals on both sides to the adjustable bottom bracket, so as to realize the synchronous linkage between the transmission system and the adjustment device. When adjusting the height, it automatically maintains the optimal transmission geometry relationship, thereby improving riding efficiency and comfort. Attached Figure Description

[0027] Figure 1 This is a perspective view of Example 1.

[0028] Figure 2 This is an exploded schematic diagram of Example 1.

[0029] Figure 3 This is a right view of the five-way adjusting bracket in its highest state according to Embodiment 1.

[0030] Figure 4 This is a right view of the middle state of the five-way adjustment bracket in Embodiment 1.

[0031] Figure 5 This is a right view of the five-way adjusting bracket in its lowest state according to Embodiment 1.

[0032] Figure 6 This is a right view of the five-way valve in its highest state according to Embodiment 1.

[0033] Figure 7 This is a right view of the five-way valve in the middle state of Embodiment 1.

[0034] Figure 8 This is a right view of the lowest state of the five-way valve in Embodiment 1.

[0035] Figure 9 This is an enlarged view of the main frame guide boss of Embodiment 1.

[0036] Reference numerals: 1. Bottom bracket; 2. Bottom bracket adjustment bracket; 21. Fixing hole; 22. Guide plate; 23. Through hole; 3. Main frame; 31. Screw hole; 32. Guide boss; 33. Groove; 4. Screw; 5. Crankset; 6. Right crank pedal; 7. Left crank pedal. Detailed Implementation

[0037] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," 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 application 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 application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Example 1:

[0041] refer to Figure 1 , Figure 2 This utility model discloses a bottom bracket adjustment device for an electric bicycle, comprising a bottom bracket 1, a bottom bracket adjustment bracket 2, and a main frame 3. The bottom bracket 1 is mounted on the bottom bracket adjustment bracket 2, and the bottom bracket adjustment bracket 2 is detachably connected to the lower side of the main frame 3.

[0042] refer to Figure 2 The main frame 3 has multiple screw holes 31 along its height direction, and the bottom bracket 2 has multiple fixing holes 21 on both sides that match the screw holes 31. Specifically, five screw holes 31 are provided on each side of the main frame 3, evenly distributed along the height adjustment direction, for a total of ten screw holes 31 on the main frame 3; three fixing holes 21 are provided on each side of the bottom bracket 2, evenly distributed along the height adjustment direction, for a total of six fixing holes 21 on the bottom bracket 2.

[0043] refer to Figure 2 and Figure 9The bottom side of the main frame 3 is integrally formed and fixedly connected with a guide boss 32. The upper part of both sides of the guide boss 32 is provided with a groove 33. The top of both sides of the five-way adjustment bracket 2 is provided with a guide plate 22 that matches the groove 33. The guide boss 32 slides between the two guide plates 22 along the height direction of the main frame 3.

[0044] The groove 33 has a trapezoidal cross-sectional shape, which gives it a certain guiding and limiting function. The shape of the guide protrusion 22 is adapted to the trapezoidal cross-section of the groove 33. Its thickness is slightly smaller than the depth of the groove 33, and its width is slightly smaller than the width of the groove 33. This ensures that the guide protrusion 22 can be smoothly embedded in the groove 33, while avoiding shaking caused by excessive gap.

[0045] refer to Figure 2 Multiple screw holes 31 are symmetrically provided on both sides of the guide boss 32 along the height direction, and multiple fixing holes 21 are symmetrically provided on both sides of the bottom bracket 2 along the height direction, and each fixing hole 21 can penetrate the inner sidewall of the bottom bracket 2; the number of screw holes 31 on both sides of the guide boss 32 is the same and their positions correspond, and the number of fixing holes 21 on both sides of the bottom bracket 2 is the same and their positions correspond, so as to ensure that when the screw 4 is used to pass through the fixing holes 21 and the corresponding screw holes 31, the force on both sides is uniform, so as to make the whole structure stable and avoid structural damage or unstable adjustment caused by uneven force.

[0046] refer to Figure 3 , Figure 4 and Figure 5 The screw hole 31 and the fixing hole 21 are locked in place by the screw 4, which enables the height adjustment of the bottom bracket 1 on the main frame 3. The inner diameter of the screw hole 31 and the fixing hole 21 is slightly larger than the outer diameter of the screw 4 to ensure that the screw 4 can pass through smoothly.

[0047] Furthermore, the screw holes 31 on the main frame 3 and the fixing holes 21 on the bottom bracket adjustment bracket 2 are both designed with uniform distribution. For example, the distance between two adjacent screw holes 31 is 10mm, and the distance between two adjacent fixing holes 21 is 20mm. Since there are more screw holes 31 than fixing holes 21, this spacing setting ensures structural strength while achieving fine adjustment. When the bottom bracket adjustment bracket 2 is in its lowest or highest state, it forms a multi-node locking by cooperating with at least four fixing holes 21 and four screw holes 31, and is tightened by screws 4. In the intermediate state, six fixing holes 21 and six corresponding screw holes 31 are used for double-sided symmetrical locking, which can further improve the load-bearing capacity and torsional performance of the overall structure while maintaining adjustment accuracy. This graded fixing strategy, combined with uniform spacing distribution, not only ensures the accuracy of bottom bracket 1 height adjustment, but also takes into account the structural stability and reliability under different adjustment positions through differentiated locking methods.

[0048] refer to Figure 2 It also includes a chainring 5, a right crank pedal 6 and a left crank pedal 7. The chainring 5 is fixedly connected to one end of the bottom bracket 1. One side of the chainring 5 is fixedly connected to the right crank pedal 6, and the other end of the bottom bracket 1 is fixedly connected to the left crank pedal 7.

[0049] Specifically, the bottom bracket 1 is equipped with a bottom bracket. One end of the bottom bracket is connected to the chainring 5 and the right crank pedal 6, and the other end is connected to the left crank pedal 7, forming a complete pedaling power chain. The right crank pedal 6 is fixedly connected to the chainring 5 to realize gear shifting. The height of the bottom bracket 1 is adjusted through the bracket 2. The relative positions of the chainring 5, the right crank pedal 6 and the left crank pedal 7 remain unchanged. Only the vertical distance between the frame 3 and the bottom bracket 1 changes, ensuring the concentricity of the drivetrain.

[0050] In addition, refer to Figure 2 The bottom of the bottom bracket 2 has a through hole 23 that matches the outer diameter of the bottom bracket 1. During installation, the bottom bracket 1 is passed through the through hole 23, initially connecting it to the bottom bracket 2. To ensure stable rotation of the bottom bracket 1 on the bottom bracket 2 without axial displacement, a bearing is installed between the bottom bracket 1 and the through hole 23. The inner ring of the bearing fits tightly against the outer wall of the bottom bracket 1, and the outer ring fits tightly against the inner wall of the through hole 23. This ensures both the flexibility of rotation of the bottom bracket 1 and enhances the stability of the connection.

[0051] refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 After passing through the fixing hole 21 on the bottom bracket adjustment bracket 2, screw 4 is inserted into the screw hole 31 corresponding to the fixing hole 21. The bottom bracket adjustment bracket 2 and the main frame 3 are locked together by threaded connection, realizing the fixation of the bottom bracket 1 at different adjustment height positions on the main frame 3. Screw 4 can be an M6 hex socket screw, and its length is designed according to the depth of the screw hole 31 and the thickness of the fixing hole 21 to ensure that screw 4 can be fully screwed into the screw hole 31 and provide sufficient preload.

[0052] refer to Figure 3 and Figure 6The installation steps for the bottom bracket adjustment bracket 2 at its highest position are as follows: When the rider is tall, or needs a better power exertion posture for high-speed riding on flat roads, the bottom bracket adjustment bracket 2 can be adjusted to its highest position. The specific operation is as follows: First, loosen screw 4, allowing the connection between the bottom bracket adjustment bracket 2 and the main frame 3 to be movable. Then, slide the bottom bracket adjustment bracket 2 upwards along the guide boss 32 until the guide boss 32 is above the guide plate 22. At this point, the fixing hole 21 on the bottom bracket adjustment bracket 2 aligns with the corresponding screw hole 31 on the upper end of the main frame 3. Finally, use screw 4 to pass through the fixing hole 21 and screw it into the corresponding screw hole 31, tightening screw 4 to firmly lock the bottom bracket adjustment bracket 2 and the main frame 3. At this point, the bottom bracket 1 is at its highest position, meaning the bottom bracket adjustment bracket 2 has reached its highest position.

[0053] refer to Figure 4 and Figure 7 The installation steps for the bottom bracket adjustment bracket 2 in its intermediate position are as follows: For most riders of average height, or when riding on mixed road conditions, the bottom bracket adjustment bracket 2 can be adjusted to its intermediate position. The steps are as follows: First, loosen screw 4, allowing the bottom bracket adjustment bracket 2 to slide on the guide boss 32. Move the bottom bracket adjustment bracket 2 to the middle position of the guide boss 32, at which point the fixing hole 21 on the bottom bracket adjustment bracket 2 corresponds to the corresponding screw hole 31 on the main frame 3 at the intermediate height. Finally, pass screw 4 through the fixing hole 21 and screw it into the screw hole 31 to complete the tightening operation, bringing the bottom bracket 1 to the intermediate height. The bottom bracket adjustment bracket 2 is now in its intermediate position, providing a more comfortable and balanced riding experience for the rider.

[0054] refer to Figure 5 and Figure 8 The installation steps for the bottom bracket adjustment bracket 2 in its lowest position are as follows: When the rider is shorter or needs improved vehicle stability while riding on rugged mountain terrain, the bottom bracket adjustment bracket 2 can be adjusted to its lowest position. Specifically: First, loosen screw 4 to disconnect the bottom bracket adjustment bracket 2 from the main frame 3. Slide the bottom bracket adjustment bracket 2 downwards along the guide boss 32 until the guide boss 32 is below the guide plate 22. At this point, the fixing hole 21 of the bottom bracket adjustment bracket 2 aligns with the lower screw hole 31 on the main frame 3. Finally, pass screw 4 through the fixing hole 21 and screw it into the screw hole 31, tightening screw 4 to bring the bottom bracket 1 to its lowest height, thus achieving the lowest position for the bottom bracket adjustment bracket 2 to suit the corresponding riding needs.

[0055] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A bottom bracket adjustment device for an electric bicycle, comprising a bottom bracket (1), a bottom bracket adjustment bracket (2), and a main frame (3), characterized in that, The bottom bracket (1) is installed on the bottom bracket adjustment bracket (2), and the bottom bracket adjustment bracket (2) is detachably connected to the lower side of the main frame (3); The main frame (3) has multiple screw holes (31) along the height direction, and the five-way adjustment bracket (2) has multiple fixing holes (21) that match the multiple screw holes (31). The screw hole (31) and the fixing hole (21) are locked and fixed by screws (4) to realize the height adjustment of the five-way connector (1) on the main frame (3).

2. The five-way adjustment device for an electric bicycle according to claim 1, characterized in that, The bottom side of the main frame (3) is integrally formed and fixedly connected with a guide boss (32). The upper part of both sides of the guide boss (32) is provided with grooves (33). The five-way adjustment bracket (2) is provided with guide plates (22) on both sides that match the grooves (33). The guide boss (32) slides between the two guide plates (22) along the height direction of the main frame (3).

3. The five-way adjustment device for an electric bicycle according to claim 1, characterized in that, The multiple screw holes (31) on the main frame (3) are evenly distributed along the height adjustment direction of the five-way adjustment bracket (2).

4. The five-way adjustment device for an electric bicycle according to claim 2, characterized in that, Multiple screw holes (31) are symmetrically provided on both sides of the guide boss (32) along the height direction.

5. The five-way adjustment device for an electric bicycle according to claim 1, characterized in that, Multiple fixing holes (21) are symmetrically opened on both sides of the five-way adjusting bracket (2) along the height direction, and the fixing holes (21) penetrate the inner walls of both sides of the five-way adjusting bracket (2).

6. The five-way adjustment device for an electric bicycle according to claim 1, characterized in that, It also includes a chainring (5), a right crank pedal (6) and a left crank pedal (7). The chainring (5) is fixedly connected to one end of the bottom bracket (1). The right crank pedal (6) is fixedly connected to one side of the chainring (5), and the left crank pedal (7) is fixedly connected to the other end of the bottom bracket (1).

7. The five-way adjustment device for an electric bicycle according to claim 1, characterized in that, After the screw (4) passes through the fixing hole (21) on the five-way adjustment bracket (2), it is inserted into the screw hole (31) corresponding to the fixing hole (21), and the five-way adjustment bracket (2) and the main frame (3) are locked by threaded connection, so as to fix the five-way bracket (1) at different adjustment height positions on the main frame (3).

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