An electric bicycle frame with a center of gravity adjustment structure

Abstract

This utility model relates to the field of electric bicycle frame technology and discloses an electric bicycle frame with a center of gravity adjustment structure, including a front stem tube. A first adjustment mechanism is provided on the right side of the front stem tube, and a second adjustment mechanism is provided on the top of the first adjustment mechanism. The first adjustment mechanism includes a crossbeam, which is fixedly connected to the front and rear sides of the front stem tube. A rear stem tube is fixedly connected to the inner side of the crossbeam, and a middle tube is fixedly connected to the bottom left side of the rear stem tube. In use, by using the first adjustment mechanism, when the rider is carrying passengers of different weights or loading goods, turning the knob can cause the threaded rod to drive the moving platform to move left and right along the slide bar, thereby adjusting the front and rear positions of the rear seat and the load above it, effectively changing the center of gravity distribution of the whole vehicle, avoiding the risk of vehicle tilting and tipping due to excessive center of gravity shift, especially in situations such as turning and sudden braking, allowing the vehicle to maintain a more stable posture.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle frame technology, specifically an electric bicycle frame with a center of gravity adjustment structure. Background Technology

[0002] With the popularization of green travel concepts, electric bicycles have become an important tool for short-distance travel for urban and rural residents due to their convenience and environmental friendliness. However, the center of gravity distribution of electric bicycles directly affects riding safety and stability. Most existing electric bicycle frames are fixed structures, and the center of gravity position cannot be flexibly adjusted according to actual usage scenarios, resulting in the following problems: When a rider carries passengers, especially passengers of different weights or loads, the center of gravity of the vehicle will change significantly with the position and weight of the load. If the center of gravity is tilted too far forward or backward, the risk of the vehicle tilting and overturning will increase under conditions such as turning and sudden braking, which seriously threatens riding safety. In special scenarios such as climbing slopes, descending slopes, and slippery roads, a fixed center of gravity position is difficult to match the road conditions. Existing frames cannot achieve such dynamic adjustments, which limits the applicability of electric bicycles.

[0003] According to the description in the patent announcement (CN221698912U) of an electric bicycle frame with a center of gravity adjustment structure, the electric bicycle frame with a center of gravity adjustment structure includes a "crossbeam, seat support" and other components to achieve adjustment.

[0004] Regarding the above description, the applicant believes the following issues exist: This electric bicycle frame with a center of gravity adjustment structure uses crossbeams, seat supports, etc. to achieve adjustment. When in use, the battery mounting height is adjusted by stretching the overall length of the connecting horizontal and vertical sliding rods. This method not only does not conform to the existing electric bicycle frame structure, but also has poor effect in center of gravity adjustment and cannot adjust the center of gravity of the rear seat forward and backward. If the center of gravity is excessively tilted forward or backward, it is easy to cause the vehicle to tilt and increase the risk of tipping over during turning, sudden braking and other conditions. Therefore, this frame needs to be improved. Utility Model Content

[0005] The purpose of this invention is to provide an electric bicycle frame with a center of gravity adjustment structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an electric bicycle frame with a center of gravity adjustment structure, including a front stem tube, a first adjustment mechanism is provided on the right side of the front stem tube, and a second adjustment mechanism is provided on the top of the first adjustment mechanism; The first adjustment mechanism includes a crossbeam, which is fixedly connected to the front and rear sides of the front riser. A rear riser is fixedly connected to the inner side of the crossbeam. A middle bottom tube is fixedly connected to the bottom left side of the rear riser. A rear wheel frame is fixedly connected to the outer periphery of the rear riser. A rear seat bracket is fixedly connected to the right side of the middle part of the rear riser. A support shaft is fixedly connected to the bottom of the rear seat bracket. A mounting base is installed on the top of the rear seat bracket. A threaded rod is rotatably connected inside the mounting base. A knob is fixedly connected to the right side of the threaded rod. A movable platform is threadedly connected to the outer periphery of the threaded rod. A sliding rod is slidably connected inside the movable platform. A rear seat cushion is fixedly connected to the top of the movable platform. A backrest is fixedly connected to the top right side of the rear seat cushion.

[0007] Preferably, the left side of the middle bottom tube is fixedly connected to the bottom right side of the front riser tube, and the support shaft is fixedly connected to the top of the rear wheel frame, so as to ensure the stability of the rear seat support through the support shaft.

[0008] Preferably, the movable platform is slidably connected inside the mounting base, and the slide rod is fixedly connected to the inner side of the mounting base, so as to ensure the stability of the movable platform movement through the slide rod.

[0009] Preferably, the slide rods are provided in two sets and are symmetrically distributed on the front and rear sides of the mounting base, so that the two sets of slide rods can be used to balance the moving platform.

[0010] Preferably, the second adjustment mechanism includes a support tube inserted into the rear riser tube. A saddle fixing plate is fixedly connected to the top of the support tube, and a connecting frame is fixedly connected to the bottom of the saddle fixing plate. A limit ring is fixedly connected to the bottom of the connecting frame, and a fixed shaft is inserted into the limit ring. A shim is slidably connected to the periphery of the fixed shaft, and the shim is located in front of the limit ring. A fixing sleeve is threadedly connected to the periphery of the rear end of the fixed shaft.

[0011] Preferably, the fixing shaft passes through the interior of the rear riser and the support tube. The rear riser, the support tube and the limiting ring are respectively provided with fixing grooves, and the three fixing grooves correspond to each other. The fixing shaft is inserted into the fixing groove, which facilitates the stability between the rear riser, the support tube and the limiting ring through the fixing shaft.

[0012] Preferably, the rear side of the gasket is in contact with the front side of the limiting ring, and the limiting ring is slidably connected to the outer periphery of the rear riser, which facilitates further improvement of the stability between the fixed shaft, the limiting ring and the fixed sleeve through the gasket.

[0013] Compared with the prior art, this utility model provides an electric bicycle frame with a center of gravity adjustment structure, which has the following advantages: This electric bicycle frame with a center-of-gravity adjustment structure, through its first adjustment mechanism, allows riders to adjust the rear seat and the load above it by turning a knob. This adjusts the position of the rear seat and the load by moving the threaded rod along the slide bar, effectively changing the overall center of gravity distribution of the bicycle. This avoids the risk of tilting or tipping over due to excessive center of gravity shift, especially during turns and sudden braking, allowing the bicycle to maintain a more stable posture and greatly improving riding safety. The slide bar provides stable support and guidance for the moving platform, and two symmetrically distributed slide bars ensure the stability of the rear seat during movement, preventing wobbling. The knob design allows users to easily adjust the position of the rear seat by turning the threaded rod without tools. Different passengers have different weights and sitting postures, and adjusting the rear seat position can match the passenger's center of gravity habits. For example, heavier passengers can move the rear seat back appropriately to avoid excessive concentration of weight in the middle of the frame and reduce uneven stress on the frame.

[0014] This electric bicycle frame features a center-of-gravity adjustment structure. Through a second adjustment mechanism, the support tube can move up and down within the rear seat tube. By engaging with fixed slots at different positions via a fixed shaft, the height of the saddle plate can be flexibly adjusted. Riders of different heights can adjust the saddle plate to a suitable position to ensure natural leg extension during riding. Raising the saddle plate allows for greater rider comfort and a moderate rearward shift of the center of gravity, preventing excessive forward tilting that could overload the front wheel and reduce nose-diving during braking. Lowering the saddle height makes it easier for the rider's feet to touch the ground, reducing the risk of tipping and improving handling stability. By adjusting the saddle height appropriately, the center of gravity can be shifted rearward or downward, increasing rear wheel traction and preventing front wheel slippage. When going downhill, the center of gravity can be tilted forward to enhance front wheel braking. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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. Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the rear view structure of this utility model; Figure 3 This is a schematic diagram of the first adjusting mechanism. Figure 4 This is a schematic diagram of the top structure of the rear seat support; Figure 5 This is a schematic diagram of the internal structure of the mounting base; Figure 6 This is a schematic diagram of the second adjustment mechanism. Figure 7 This is a schematic diagram of the bottom structure of the saddle fixing plate.

[0016] In the diagram: 1. Front riser; 2. First adjustment mechanism; 3. Second adjustment mechanism; 21. Crossbeam; 22. Middle bottom tube; 23. Rear riser; 24. Rear wheel frame; 25. Support shaft; 26. Rear seat bracket; 27. Mounting seat; 28. Slide rod; 29. ​​Moving platform; 291. Knob; 292. Rear seat cushion; 293. Backrest; 294. Threaded rod; 31. Support tube; 32. Saddle fixing plate; 33. Connecting frame; 34. Limiting ring; 35. Fixed shaft; 36. Gasket; 37. Fixing sleeve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction 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.

[0019] This utility model provides the following technical solution: Example 1

[0020] Please see Figure 1-7 This utility model provides a technical solution: an electric bicycle frame with a center of gravity adjustment structure, including a front stem tube 1, a first adjustment mechanism 2 is provided on the right side of the front stem tube 1, and a second adjustment mechanism 3 is provided on the top of the first adjustment mechanism 2; The first adjustment mechanism 2 includes a crossbeam 21, which is fixedly connected to the front and rear sides of the front riser 1. A rear riser 23 is fixedly connected to the inner side of the crossbeam 21. A middle bottom tube 22 is fixedly connected to the bottom left side of the rear riser 23. A rear wheel frame 24 is fixedly connected to the outer side of the rear riser 23. A rear seat bracket 26 is fixedly connected to the right side of the middle part of the rear riser 23. A support shaft 25 is fixedly connected to the bottom of the rear seat bracket 26. A mounting base 27 is mounted on the top of the rear seat bracket 26. A threaded rod 294 is rotatably connected inside the mounting base 27. A knob 291 is fixedly connected to the right side of the threaded rod 294. A moving platform 29 is threadedly connected to the outer side of the threaded rod 294. A sliding rod 28 is slidably connected inside the moving platform 29. A rear seat cushion 292 is fixedly connected to the top of the moving platform 29. A backrest 293 is fixedly connected to the top right side of the rear seat cushion 292.

[0021] The left side of the middle bottom tube 22 is fixedly connected to the bottom right side of the front riser tube 1, and the support shaft 25 is fixedly connected to the top of the rear wheel frame 24, so as to ensure the stability of the rear seat bracket 26 through the support shaft 25. The moving platform 29 is slidably connected to the inside of the mounting base 27, and the slide rod 28 is fixedly connected to the inside of the mounting base 27, so as to ensure the stability of the movement of the moving platform 29 through the slide rod 28.

[0022] Two sets of slide bars 28 are provided and symmetrically distributed on the front and rear sides of the mounting base 27, so that the two sets of slide bars 28 can be used to balance the moving platform 29. Example 2

[0023] Please see Figure 1-7 Furthermore, based on Embodiment 1, the second adjustment mechanism 3 includes a support tube 31, which is inserted into the rear riser 23. A saddle fixing plate 32 is fixedly connected to the top of the support tube 31, and a connecting frame 33 is fixedly connected to the bottom of the saddle fixing plate 32. A limit ring 34 is fixedly connected to the bottom of the connecting frame 33. A fixed shaft 35 is inserted into the limit ring 34, and a gasket 36 is slidably connected to the periphery of the fixed shaft 35. The gasket 36 is located on the front side of the limit ring 34, and a fixing sleeve 37 is threadedly connected to the periphery of the rear end of the fixed shaft 35.

[0024] The fixed shaft 35 passes through the interior of the rear riser 23 and the support tube 31. The rear riser 23, the support tube 31 and the limiting ring 34 are respectively provided with fixed grooves, and the three fixed grooves correspond to each other. The fixed shaft 35 is inserted into the fixed groove, which facilitates the stability between the rear riser 23, the support tube 31 and the limiting ring 34 through the fixed shaft 35.

[0025] The rear side of the gasket 36 is in contact with the front side of the limiting ring 34, and the limiting ring 34 is slidably connected to the periphery of the rear riser 23, so that the stability between the fixed shaft 35, the limiting ring 34 and the fixed sleeve 37 can be further improved by the gasket 36.

[0026] In actual operation, when this device is used, if the rider is carrying passengers of different weights or loading goods, turning the knob 291 will cause the threaded rod 294 to move the movable platform 29 along the slide rod 28, thereby adjusting the front and rear positions of the rear seat 292 and the load above it. This effectively changes the overall center of gravity distribution of the vehicle, avoiding the risk of tilting or tipping due to excessive center of gravity shift. Especially in situations such as turning and sudden braking, it can keep the vehicle in a more stable posture, greatly improving safety during riding. The slide rod 28 is used for movement. Platform 29 provides stable support and guidance. Two sets of symmetrically distributed sliding rods 28 ensure the stability of the rear seat cushion 292 during movement and prevent wobbling. The knob 291 allows users to easily adjust the position of the rear seat cushion 292 by turning the threaded rod 294 without the need for tools. Different passengers have different weights and sitting postures. Adjusting the position of the rear seat cushion 292 can match the passenger's center of gravity habits. For example, heavier passengers can move the rear seat back appropriately to avoid excessive concentration of the center of gravity in the middle of the frame and reduce uneven stress on the frame. When the height of the saddle fixing plate 32 needs to be adjusted, first remove the fixing sleeve 37, fixing shaft 35 and shim 36, so that the saddle fixing plate 32 drives the connecting frame 33 and the limiting ring 34 to slide around the rear riser tube 23, which can drive the support tube 31 to slide inside the rear riser tube 23, thereby changing the height of the saddle fixing plate 32. After the adjustment is completed, the fixing shaft 35 is matched with the fixing grooves at different positions, and the shim 36 is slidably connected to the outer side of the fixing shaft 35, so that the rear side of the shim 36 is in contact with the front side of the limiting ring 34. When the support tube 31, the rear riser tube 23 and the limiting ring 34 are in a stable state, the fixing sleeve 37 can be threaded to the outer side of the rear end of the fixing shaft 35 to further ensure the stability between the three and flexibly adjust the height of the saddle fixing plate 32. Riders of different heights can adjust the saddle mounting plate 32 to a suitable position according to their own needs, ensuring that their legs can extend naturally while riding. Raising the height of the saddle mounting plate 32 allows the rider's body to stretch out more, and the center of gravity to shift slightly backward, avoiding excessive forward tilting of the center of gravity which would cause excessive load on the front wheel and reduce nose-diving during braking. Lowering the saddle height makes it easier for the rider's feet to touch the ground, lowers the center of gravity, reduces the risk of tipping over, and improves handling stability. By adjusting the saddle height appropriately, the center of gravity can be adjusted to the rear or lower, increasing the rear wheel's grip and preventing the front wheel from slipping. When going downhill, the center of gravity can be tilted forward to enhance the front wheel's braking effect.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An electric bicycle frame with a center of gravity adjustment structure, comprising a front stem (1), characterized in that: A first adjustment mechanism (2) is provided on the right side of the front riser (1), and a second adjustment mechanism (3) is provided on the top of the first adjustment mechanism (2). The first adjustment mechanism (2) includes a crossbeam (21), which is fixedly connected to the front and rear sides of the front riser (1). A rear riser (23) is fixedly connected to the inner side of the crossbeam (21). A middle bottom tube (22) is fixedly connected to the bottom left side of the rear riser (23). A rear wheel frame (24) is fixedly connected to the outer periphery of the rear riser (23). A rear seat bracket (26) is fixedly connected to the right side of the middle part of the rear riser (23). A support shaft (25) is fixedly connected to the bottom of the rear seat bracket (26). The rear seat bracket (26) has a top mounting base (27). The mounting base (27) is rotatably connected to a threaded rod (294). A knob (291) is fixedly connected to the right side of the threaded rod (294). A movable platform (29) is threadedly connected to the outer periphery of the threaded rod (294). A slide rod (28) is slidably connected inside the movable platform (29). A rear seat cushion (292) is fixedly connected to the top of the movable platform (29). A backrest (293) is fixedly connected to the top right side of the rear seat cushion (292).

2. The electric bicycle frame with a center of gravity adjustment structure according to claim 1, characterized in that: The left side of the middle bottom tube (22) is fixedly connected to the bottom right side of the front riser tube (1), and the support shaft (25) is fixedly connected to the top of the rear wheel frame (24).

3. The electric bicycle frame with a center of gravity adjustment structure according to claim 1, characterized in that: The mobile platform (29) is slidably connected inside the mounting base (27), and the slide rod (28) is fixedly connected to the inside of the mounting base (27).

4. The electric bicycle frame with a center of gravity adjustment structure according to claim 1, characterized in that: The slide bar (28) is provided in two sets and is symmetrically distributed on the front and rear sides of the mounting base (27).

5. The electric bicycle frame with a center of gravity adjustment structure according to claim 1, characterized in that: The second adjustment mechanism (3) includes a support tube (31), which is inserted into the rear riser (23). A saddle fixing plate (32) is fixedly connected to the top of the support tube (31), and a connecting frame (33) is fixedly connected to the bottom of the saddle fixing plate (32). A limit ring (34) is fixedly connected to the bottom of the connecting frame (33). A fixed shaft (35) is inserted into the inside of the limit ring (34). A gasket (36) is slidably connected to the outside of the fixed shaft (35). The gasket (36) is located on the front side of the limit ring (34). A fixing sleeve (37) is threadedly connected to the rear end of the fixed shaft (35).

6. The electric bicycle frame with a center of gravity adjustment structure according to claim 5, characterized in that: The fixed shaft (35) passes through the interior of the rear riser (23) and the support pipe (31). The rear riser (23), the support pipe (31) and the limiting ring (34) are respectively provided with fixed grooves, and the three fixed grooves correspond to each other. The fixed shaft (35) is inserted into the fixed groove.

7. The electric bicycle frame with a center of gravity adjustment structure according to claim 5, characterized in that: The rear side of the gasket (36) is in contact with the front side of the limiting ring (34), and the limiting ring (34) is slidably connected to the periphery of the rear riser (23).

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