A power-assisted bicycle frame with telescopic structure

Abstract

The utility model discloses a kind of power-assisted bicycle frame with telescopic structure, including rotating member, rotating outer tooth slot, rotating inner tooth slot, axle cavity, second guide strip and third sleeve;The bottom side outer wall of battery compartment is provided with first connecting rod, first connecting rod is provided with reinforcing pipe sleeve, the top of first connecting rod is fixedly connected with first fixed flange, and the top of first connecting rod is provided with fixing piece;The utility model is with structured design, the integrated design of the device is realized through three-section sleeve integrated transmission, saddle support rod telescopic, the multidimensional collaborative adjustment of handlebar height, saddle height and handlebar and saddle horizontal distance, can accurately adapt the riding posture demand of different body shape user, whether it is the relaxed posture of leisure cycling or the labor-saving posture of long-distance cycling can be fully satisfied, significantly expand the user adaptation range of frame, simultaneously, integrated telescopic structure can make frame overall profile flexible contraction.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to a power-assisted bicycle frame with a telescopic structure. Background Technology

[0002] In the field of e-bikes, the frame, as the core load-bearing component, directly affects riding adaptability, storage convenience, and usage safety. Existing e-bike frames mostly adopt a one-piece fixed structure or only have a simple single-dimensional telescopic function, presenting the following technical pain points: First, existing e-bike frames mostly use fixed-size structures or simple single-dimensional telescopic designs, making it difficult to meet the personalized riding posture needs of users with different body types. Fixed frames cannot flexibly adjust key riding parameters such as saddle height and handlebar spacing, resulting in some users experiencing stiff posture and uneven force distribution. Even some frames with telescopic functions suffer from problems such as limited adjustment dimensions and rudimentary locking structures, making them prone to loosening and shifting during riding, affecting usage safety. Furthermore, the overall size and wheelbase of traditional frames lack flexible adjustment space, and the telescopic structure is mostly a decentralized design, with exposed protruding parts even after telescopic adjustment, making it difficult to adapt to urban environments. The diverse storage scenarios, such as elevator transportation, storage in confined spaces, and vehicle transport, result in a large overall vehicle footprint and insufficient ease of use. Secondly, existing multi-dimensional telescopic frames generally suffer from structural design flaws. The telescopic components and core load-bearing components such as the battery compartment and wheel frame are often connected separately, leading to discontinuous force transmission paths and stress concentration points at the connection points. This affects the overall torsional resistance and load-bearing strength of the frame. The locking mechanism often uses a single buckle or simple thread structure, which has problems such as low adjustment accuracy and large transmission gaps. After long-term use, the locking performance is prone to decline, and it may even cause safety hazards. In addition, the protection design of the wiring and transmission structure at the telescopic connection is rudimentary. Exposed wiring or simple corrugated pipe protection is insufficient to resist the erosion of external environments such as dust and rainwater. During the activity, the wiring is prone to pulling and wear, reducing the service life of the electrical system. The transmission structure lacks effective sealing protection and is susceptible to interference from foreign objects, which can cause transmission jamming and failure. Utility Model Content

[0003] The purpose of this invention is to provide a power-assisted bicycle frame with a telescopic structure to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a power-assisted bicycle frame with a telescopic structure, including a battery compartment, a first connecting rod is provided on the outer wall of one side of the bottom of the battery compartment, a reinforcing sleeve is provided on the first connecting rod, a first fixing flange is fixedly connected to the top end of the first connecting rod, a fixing member is provided at the top end of the first connecting rod, a fixing hole is opened at the top end of the first connecting rod corresponding to the position of the fixing member, a movable gear is provided inside the fixing member, a movable groove is opened on the fixing member corresponding to the position of the movable gear, a pin hole is opened inside the movable gear, a threaded hole is opened in the movable groove corresponding to the position of the pin hole, a bolt is provided inside the pin hole, and the end of the bolt is threaded into the threaded hole.

[0005] As a further technical solution of this utility model, the outer wall of the movable gear is provided with a connecting external tooth groove, a rotating component is provided on the outer side of the movable gear, and a connecting internal tooth groove is provided in the rotating component at the position corresponding to the connecting external tooth groove.

[0006] As a further technical solution of this utility model, the rotating component is provided with an insertion hole, and a first sleeve is sleeved inside the rotating component. The end of the first sleeve is sleeved in the insertion hole. A central movable shaft is provided inside the first sleeve, and a sleeve post is provided at the end of the central movable shaft. A sleeve hole is provided on the bottom inner wall of the first sleeve at the position corresponding to the position of the sleeve post. The end of the sleeve post is provided in the insertion hole, and a rotating external tooth groove is provided at the end of the sleeve post. A rotating internal tooth groove is provided inside the movable gear at the position corresponding to the rotating external tooth groove.

[0007] As a further technical solution of this utility model, a second sleeve is provided on the outer side of the first sleeve, a first inner cavity is opened in the second sleeve, the first sleeve is disposed in the first inner cavity, a first guide strip is provided on the outer wall of the first sleeve, a first guide groove is opened on the inner wall of the first inner cavity corresponding to the position of the first guide strip, a coarse movable threaded post is provided in the second sleeve, a shaft cavity is opened in the coarse movable threaded post, a central movable shaft post is provided in the shaft cavity, a second guide strip is provided on the outer wall of the central movable shaft post, a second guide groove is opened on the inner wall of the shaft cavity corresponding to the position of the second guide strip, and a coarse internal thread is opened on the top inner wall of the first sleeve corresponding to the position of the coarse movable threaded post.

[0008] As a further technical solution of this utility model, a third sleeve is provided on the outside of the second sleeve, a second inner cavity is opened in the third sleeve, the second sleeve is disposed in the second inner cavity, a fine movable threaded column is provided in the second inner cavity, a fine internal thread is opened on the top inner wall of the coarse movable threaded column corresponding to the position of the fine movable threaded column, and a cavity is opened in the central movable shaft column corresponding to the position of the fine movable threaded column.

[0009] As a further technical solution of this utility model, a second connecting rod is provided at the top end of the third sleeve, and a second fixing flange is fixedly connected to the connecting ends of the second connecting rod and the third sleeve. A front bracket is fixedly connected to the top end of the second connecting rod, and a front wheel bracket is provided at the bottom of the front bracket.

[0010] As a further technical solution of this utility model, a rod compartment is provided on one side outer wall of the battery compartment, a saddle support rod is provided inside the rod compartment, and a rear wheel frame is fixedly connected to the rear outer wall of the battery compartment.

[0011] Compared with existing technologies, the beneficial effects achieved by this utility model are as follows: This utility model adopts a structured design. The device achieves multi-dimensional coordinated adjustment of handlebar height, saddle height, and horizontal distance between the handlebar and saddle through the integrated design of three-section sleeve transmission and saddle support rod telescopic design. It can accurately adapt to the riding posture needs of users with different body shapes, fully satisfying both the relaxed posture of leisure riding and the energy-saving posture of long-distance riding, significantly expanding the user adaptability range of the frame. At the same time, the integrated telescopic structure allows the overall outline of the frame to flexibly shrink, with no exposed protruding parts after shrinking, making the overall layout of the vehicle more compact. It can easily adapt to diverse storage scenarios such as elevator transportation, vehicle carrying, and storage in small spaces, effectively solving the storage pain points of urban users and greatly improving the convenience of use. Furthermore, the device adopts a triple anti-loosening structure design of gear meshing, thread self-locking, and bolt fixing. The gear meshing transmission ensures precise guidance during the adjustment process. Precise, gapless movement and the self-locking thread feature enable automatic locking after extension and retraction. Combined with bolt mechanical fixing, this forms a double safety net, effectively preventing loosening and displacement during riding and ensuring a stable and reliable locked state. The centralized load-bearing layout with the battery compartment at its core constructs a continuous mechanical transmission path through reinforced tubing, fixed flanges, and coaxial nested sleeves, eliminating stress concentration points and significantly improving the overall torsional resistance and load-bearing strength of the frame. This ensures structural stability for long-term use. The three-section nested sleeves form a closed cavity structure, which not only provides dustproof and waterproof sealing protection for internal transmission components, preventing transmission failure caused by external environmental interference, but also provides an internal wiring channel for electrical circuits, effectively preventing wire pulling and wear, and extending the service life of the electrical system. At the same time, the frame retains the original installation interfaces of the core components of the electric bicycle, allowing direct adaptation to existing mature supporting components without the need for redesign and development, reducing production and upgrade costs. Attached Figure Description

[0012] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is an exploded view of the structure of this utility model;

[0015] Figure 3 for Figure 2 Enlarged structural diagram of region A in the middle;

[0016] Figure 4 This is a cross-sectional exploded view of a portion of the structure of this utility model.

[0017] In the diagram: 1. Battery compartment; 2. First connecting rod; 3. Reinforcing sleeve; 4. First fixing flange; 5. Fixing component; 6. Fixing hole; 7. Movable gear; 8. Movable groove; 9. Pin hole; 10. Threaded hole; 11. Bolt; 12. Connecting external gear groove; 13. Rotating component; 14. Connecting internal gear groove; 15. Insertion hole; 16. Central movable shaft; 17. Sleeve column; 18. Rotating external gear groove; 19. Rotating internal gear groove; 20. First sleeve; 21. Sleeve hole; 22. Second sleeve 23. Tube; 24. First inner cavity; 25. First guide bar; 26. First guide groove; 27. Coarse movable threaded column; 28. Shaft cavity; 29. ​​Second guide groove; 30. Second guide bar; 31. Coarse internal thread; 32. Third sleeve; 33. Second inner cavity; 34. Fine movable threaded column; 35. Fine internal thread; 36. Second connecting rod; 37. Second fixed flange; 38. Front bracket; 39. Front wheel frame; 40. Rod magazine; 41. Saddle support rod; 42. Rear wheel frame; 43. Hole cavity. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Please see the appendix Figure 1 -Appendix Figure 4This utility model provides an embodiment of a power-assisted bicycle frame with a telescopic structure, including a battery compartment 1. A first connecting rod 2 is provided on the outer wall of one side of the bottom of the battery compartment 1. A reinforcing sleeve 3 is provided on the first connecting rod 2. A first fixing flange 4 is fixedly connected to the top of the first connecting rod 2. A fixing member 5 is provided at the top of the first connecting rod 2. A fixing hole 6 is opened at the position of the fixing member 5 at the top of the first connecting rod 2. A movable gear 7 is provided inside the fixing member 5. A movable groove 8 is opened at the position of the movable gear 7 on the fixing member 5. A pin hole 9 is opened inside the movable gear 7. A threaded hole 10 is opened at the position of the pin hole 9 in the movable groove 8. A bolt 11 is provided in the pin hole 9. The end thread is connected to the threaded hole 10; the outer wall of the movable gear 7 is provided with a connecting external tooth groove 12, and a rotating part 13 is provided on the outer side of the movable gear 7. The rotating part 13 is provided with a connecting internal tooth groove 14 at the position corresponding to the connecting external tooth groove 12. The connecting external tooth groove 12 and the connecting internal tooth groove 14 mesh to transmit torque and drive the rotating part 13 to rotate synchronously with the movable gear 7; the rotating part 13 is provided with a plug hole 15, and a first sleeve 20 is sleeved in the rotating part 13. The end of the first sleeve 20 is sleeved in the plug hole 15. A central movable shaft 16 is provided in the first sleeve 20, and a sleeve post 17 is provided at the end of the central movable shaft 16. The bottom inner wall of the first sleeve 20 is provided with a sleeve post 17 at the position corresponding to the sleeve post 17. A sleeve 21 is provided, and the end of the sleeve post 17 is set in the insertion hole 15. The end of the sleeve post 17 is provided with a rotating external tooth groove 18. A rotating internal tooth groove 19 is provided in the movable gear 7 at the position corresponding to the rotating external tooth groove 18. The insertion hole 15 realizes the nesting and positioning of the first sleeve 20 and the rotating component 13. The rotating external tooth groove 18 and the rotating internal tooth groove 19 mesh, driving the central movable shaft post 16 to rotate synchronously. A second sleeve 22 is provided on the outside of the first sleeve 20. A first inner cavity 23 is provided in the second sleeve 22. The first sleeve 20 is set in the first inner cavity 23. A first guide strip 24 is provided on the outer wall of the first sleeve 20. A first guide strip 24 is provided on the inner wall of the first inner cavity 23 at the position corresponding to the first guide strip 24. The guide groove 25, the second sleeve 22 is provided with a coarse movable threaded post 26, the coarse movable threaded post 26 is provided with a shaft cavity 27, the shaft cavity 27 is provided with a central movable shaft post 16, the outer wall of the central movable shaft post 16 is provided with a second guide bar 29, the inner wall of the shaft cavity 27 is provided with a second guide groove 28 corresponding to the position of the second guide bar 29, the top inner wall of the first sleeve 20 is provided with a coarse internal thread 30 corresponding to the position of the coarse movable threaded post 26, the first guide bar 24 cooperates with the first guide groove 25 to prevent the second sleeve 22 from radially offset, the second guide bar 29 cooperates with the second guide groove 28 to convert the rotational motion into axial motion, the coarse internal thread 30 meshes with the coarse movable threaded post 26 to drive the extension and retraction of the second sleeve 22;A third sleeve 31 is provided on the outer side of the second sleeve 22. A second inner cavity 32 is formed inside the third sleeve 31. The second sleeve 22 is located in the second inner cavity 32. A fine movable threaded post 33 is provided in the second inner cavity 32. A fine internal thread 34 is formed on the top inner wall of the coarse movable threaded post 26 at the position corresponding to the fine movable threaded post 33. A cavity 42 is formed in the central movable shaft post 16 at the position corresponding to the fine movable threaded post 33. The fine internal thread 34 engages with the fine movable threaded post 33 to drive the extension and retraction of the third sleeve 31. The cavity 42 accommodates the end of the fine movable threaded post 33 to prevent interference. A second connecting rod 35 is provided at the top end of the third sleeve 31. The second connecting rod 35 and the third sleeve 31 are both fixedly connected to a second fixing flange 36. A front support 37 is fixedly connected to the top of the second connecting rod 35, and a front wheel frame 38 is located at the bottom of the front support 37. The second fixing flange 36 securely connects the second connecting rod 35 and the third sleeve 31, simultaneously adjusting the positions of the front support 37 and the front wheel frame 38. A rod compartment 39 is provided on one outer wall of the battery compartment 1, containing a saddle support rod 40. A rear wheel frame 41 is fixedly connected to the rear outer wall of the battery compartment 1. The rod compartment 39 accommodates the saddle support rod 40 to achieve saddle height adjustment, and the rear wheel frame 41 supports the rear wheel, forming the riding frame.

[0020] Working Principle: Using this invention, the battery compartment 1 serves as the core of the overall structure. A support base for the front telescopic structure is built on the outer wall of one side of its bottom via a first connecting rod 2. A reinforcing sleeve 3 fitted onto the outer wall of the first connecting rod 2 enhances the rod's bending resistance and prevents deformation during adjustment. The top of the first connecting rod 2 is precisely positioned with the fixing component 5 via a first fixing flange 4. The two are installed through fixing holes 6, ensuring a stable connection between the fixing component 5 and the first connecting rod 2. When telescopic adjustment is required, the bolt 11, which passes through the inner pin hole 9 of the movable gear 7 and the inner threaded hole 10 of the fixing component 5, is loosened to release the locking state of the movable gear 7 in the movable groove 8 of the fixing component 5, allowing the movable gear 7 to rotate flexibly along the movable groove 8, facilitating subsequent... The transmission mechanism provides the necessary conditions. The connecting external tooth groove 12 on the outer wall of the movable gear 7 precisely meshes with the connecting internal tooth groove 14 on the inner wall of the outer rotating component 13. When the movable gear 7 rotates, the meshing structure transmits torque to the rotating component 13, causing it to rotate synchronously. The insertion hole 15 inside the rotating component 13 is used to nest the end of the first sleeve 20. At the same time, the sleeve post 17 at the end of the central movable shaft 16 passes through the sleeve hole 21 on the bottom inner wall of the first sleeve 20 and extends into the insertion hole 15. The rotating external tooth groove 18 at the end of the sleeve post 17 engages with the rotating internal tooth groove 19 on the inner wall of the movable gear 7, so that when the movable gear 7 rotates, it synchronously drives the central movable shaft 16 to rotate around its own axis, forming a stable transmission path with double tooth groove meshing, avoiding adjustment deviations caused by transmission clearance. The central movable shaft 16 passes through the shaft cavity 27 within the coarse movable threaded shaft 26. The second guide bar 29 on the outer wall of the central movable shaft 16 slides into the second guide groove 28 on the inner wall of the shaft cavity 27, converting the rotational motion of the central movable shaft 16 into the axial linear motion of the coarse movable threaded shaft 26. The coarse movable threaded shaft 26 engages with the coarse internal thread 30 on the inner wall of the top of the first sleeve 20. When the coarse movable threaded shaft 26 moves axially, it drives the second sleeve 22, which is sleeved on the outside of the first sleeve 20, to move synchronously. The first guide groove 25 on the inner wall of the first inner cavity 23 of the second sleeve 22 engages with the first guide bar 24 on the outer wall of the first sleeve 20, restricting the second sleeve 22 to only extend and retract axially, avoiding radial displacement. The second sleeve 22 is sleeved on the third sleeve. Within the second inner cavity 32 of tube 31, the fine internal thread 34 on the top inner wall of the coarse movable threaded column 26 engages with the fine movable threaded column 33 within the second inner cavity 32. When the coarse movable threaded column 26 moves axially, it drives the fine movable threaded column 33 via threaded transmission, causing the third sleeve 31 to extend or retract relative to the second sleeve 22. The cavity 42 within the central movable shaft column 16 accommodates the end of the fine movable threaded column 33, preventing interference with the central movable shaft column 16 and ensuring complete extension / retraction. The top end of the third sleeve 31 is fixedly connected to the second connecting rod 35 via the second fixed flange 36. The bottom of the front bracket 37, fixed to the top end of the second connecting rod 35, is connected to the front wheel frame 38. Therefore, the extension / retraction of the third sleeve 31 can synchronously adjust the positions of the front bracket 37 and the front wheel frame 38.To achieve multi-dimensional adaptation of handlebar height and the horizontal distance between the handlebars and the saddle, a lever compartment 39 on one side of the battery compartment 1 is used to house the saddle support rod 40. The saddle support rod 40 can freely extend and retract along the axis of the lever compartment 39, directly adjusting the saddle height to accommodate the riding posture needs of users of different body types. After all extension and retraction adjustments are in place, the bolt 11 is tightened, locking the movable gear 7 through the pin hole 9 and the threaded hole 10, thereby fixing the position of the rotating part 13, the central movable shaft 16, and each threaded post. At the same time, the self-locking characteristic of the threaded structure and the locking of the bolt 11 form a double fixation, ensuring that the extension structure does not loosen during riding. The rear wheel bracket 41 fixed to the rear outer wall of the battery compartment 1 is used to support the rear wheel, working together with the front adjustment structure to form a complete riding frame, ultimately achieving the functional goals of multi-dimensional adaptation, stable load-bearing, and convenient storage.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A power-assisted bicycle frame with a telescopic structure, comprising a battery compartment (1), characterized in that: A first connecting rod (2) is provided on the outer wall of the bottom side of the battery compartment (1). A reinforcing sleeve (3) is provided on the first connecting rod (2). A first fixing flange (4) is fixedly connected to the top of the first connecting rod (2). A fixing member (5) is provided at the top of the first connecting rod (2). A fixing hole (6) is opened at the position of the fixing member (5) at the top of the first connecting rod (2). A movable gear (7) is provided in the fixing member (5). A movable groove (8) is opened at the position of the movable gear (7) on the fixing member (5). A pin hole (9) is opened in the movable gear (7). A threaded hole (10) is opened at the position of the pin hole (9) in the movable groove (8). A bolt (11) is provided in the pin hole (9). The end of the bolt (11) is threadedly connected to the threaded hole (10).

2. The power-assisted bicycle frame with a telescopic structure according to claim 1, characterized in that: The outer wall of the movable gear (7) is provided with a connecting external tooth groove (12), and a rotating part (13) is provided on the outer side of the movable gear (7). A connecting internal tooth groove (14) is provided in the rotating part (13) at the position corresponding to the connecting external tooth groove (12).

3. The power-assisted bicycle frame with a telescopic structure according to claim 2, characterized in that: The rotating component (13) has an insertion hole (15) and a first sleeve (20) is sleeved inside the rotating component (13). The end of the first sleeve (20) is sleeved inside the insertion hole (15). A central movable shaft (16) is provided inside the first sleeve (20). A sleeve post (17) is provided at the end of the central movable shaft (16). A sleeve hole (21) is provided on the bottom inner wall of the first sleeve (20) at the position corresponding to the sleeve post (17). The end of the sleeve post (17) is provided inside the insertion hole (15). A rotating external tooth groove (18) is provided at the end of the sleeve post (17). A rotating internal tooth groove (19) is provided in the movable gear (7) at the position corresponding to the rotating external tooth groove (18).

4. The power-assisted bicycle frame with a telescopic structure according to claim 3, characterized in that: A second sleeve (22) is provided on the outside of the first sleeve (20). A first inner cavity (23) is provided inside the second sleeve (22). The first sleeve (20) is located inside the first inner cavity (23). A first guide bar (24) is provided on the outer wall of the first sleeve (20). A first guide groove (25) is provided on the inner wall of the first inner cavity (23) at the position corresponding to the first guide bar (24). A coarse movable threaded post (26) is provided inside the second sleeve (22). A shaft cavity (27) is provided inside the coarse movable threaded post (26). A central movable shaft post (16) is provided inside the shaft cavity (27). A second guide bar (29) is provided on the outer wall of the central movable shaft post (16). A second guide groove (28) is provided on the inner wall of the shaft cavity (27) at the position corresponding to the second guide bar (29). A coarse internal thread (30) is provided on the top inner wall of the first sleeve (20) at the position corresponding to the coarse movable threaded post (26).

5. A power-assisted bicycle frame with a telescopic structure according to claim 4, characterized in that: A third sleeve (31) is provided on the outside of the second sleeve (22). A second inner cavity (32) is opened inside the third sleeve (31). The second sleeve (22) is located in the second inner cavity (32). A fine movable threaded column (33) is provided inside the second inner cavity (32). A fine internal thread (34) is opened on the top inner wall of the coarse movable threaded column (26) at the position corresponding to the fine movable threaded column (33). A cavity (42) is opened in the central movable shaft column (16) at the position corresponding to the fine movable threaded column (33).

6. The power-assisted bicycle frame with a telescopic structure according to claim 5, characterized in that: The top end of the third sleeve (31) is provided with a second connecting rod (35), and the connecting ends of the second connecting rod (35) and the third sleeve (31) are both fixedly connected with a second fixing flange (36). The top end of the second connecting rod (35) is fixedly connected with a front bracket (37), and the bottom of the front bracket (37) is provided with a front wheel bracket (38).

7. The power-assisted bicycle frame with a telescopic structure according to claim 1, characterized in that: A rod compartment (39) is provided on one side outer wall of the battery compartment (1), and a saddle support rod (40) is provided inside the rod compartment (39). A rear wheel frame (41) is fixedly connected to the rear outer wall of the battery compartment (1).

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