Double-drive bicycle
By using the transmission and steering mechanism of the dual-drive bicycle, the problem of interference from the front-wheel drive mechanism is solved, achieving synchronous drive of the front and rear wheels and steering flexibility, thus improving the bicycle's riding ability and comfort in harsh environments.
Patent Information
- Application Number
- CN202520819124.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-04-27
AI Technical Summary
Existing dual-drive bicycles are prone to motion interference in the front-wheel drive mechanism when turning, resulting in difficulty in steering and making them unsuitable for harsh environments.
The bicycle features a dual-drive design, achieving synchronous drive between the front and rear wheels through a transmission device and a direction conversion mechanism. Combined with a telescopic mechanism and universal joint to compensate for angular deviations, it optimizes pedal position to improve riding ability and steering flexibility.
It achieves balanced drive between the front and rear wheels, improving the bicycle's traction and steering agility on complex road surfaces, adapting to high-speed riding, and enhancing riding comfort and efficiency.
Smart Images
Figure CN223934895U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of bicycles, and in particular to a dual-drive bicycle. Background Technology
[0002] With increasing environmental awareness and growing demand for fitness and exercise, bicycles are becoming increasingly popular. However, when cycling enthusiasts tackle challenging terrains (such as mud, gravel, snow, and steep slopes), they often encounter problems with single rear-wheel drive bicycles, such as insufficient traction, low climbing efficiency, poor adaptability, and easy slippage. While existing dual-wheel drive bicycles are more energy-efficient to ride, the front-wheel drive mechanism is prone to motion interference during steering, leading to steering difficulties and making them unsuitable for practical use. Summary of the Invention
[0003] The purpose of this application is to solve the problem in the prior art that the front wheel drive mechanism of a dual-drive bicycle is prone to motion interference when turning, resulting in difficulty in steering. This application provides a dual-drive bicycle that solves the problem of easy interference in the front wheel drive and inflexible steering in the prior art.
[0004] This application provides a dual-drive bicycle, including a frame, a front wheel, a rear wheel, and a pedal mechanism mounted on the frame. The pedal mechanism has a first chainring and a second chainring coaxially arranged, and the first chainring and the second chainring are driven to rotate synchronously through the pedal mechanism. The first chainring is driven to the rear wheel and is used to drive the rear wheel. The second chainring is driven to the front wheel through a transmission device and is used to drive the front wheel. The transmission device includes a first direction conversion mechanism driven to the second chainring, a second direction conversion mechanism driven to the front wheel, and a telescopic mechanism that drives the first direction conversion mechanism and the second direction conversion mechanism.
[0005] The second chainring drives the first direction conversion mechanism through the first chain drive device. After the first direction conversion mechanism changes the transmission direction, it drives the second direction conversion mechanism through the telescopic mechanism. After the second direction conversion mechanism changes the direction of the power output from the telescopic mechanism, it drives the front wheel through the second chain drive device.
[0006] In some embodiments, the frame further includes a slant beam, a fixed beam connecting the seat, and a steering mechanism. One end of the slant beam is connected to the steering mechanism, and the other end is fixed to the middle of the fixed beam. A second direction conversion mechanism is disposed on the steering mechanism, and a first direction conversion mechanism is disposed on the slant beam.
[0007] In some embodiments, the telescopic mechanism includes a telescopic rod and a universal joint disposed on at least one side of the telescopic rod; when the steering mechanism rotates, it drives the second direction conversion mechanism to rotate synchronously, at which time the telescopic rod connected to the second direction conversion mechanism reciprocates axially; the universal joint compensates for the angular deviation between the telescopic rod and the second direction conversion mechanism and / or the first direction conversion mechanism during steering.
[0008] In some embodiments, the first direction conversion mechanism includes a first sprocket, at least one set of first helical gears, and an output shaft; the first sprocket inputs power to the first helical gear set by rotation, the first helical gear set changes the direction of power, and the output shaft connected to the first helical gear set transmits the converted power to the telescopic mechanism.
[0009] In some embodiments, the second direction conversion mechanism includes an input shaft, at least one set of second helical gears and a second sprocket; the telescopic mechanism drives the input shaft to rotate, inputs power to the second helical gear set, the second helical gear set changes the direction of power, and the second sprocket connected to the second helical gear set drives the front wheel with the power after the direction conversion.
[0010] In some embodiments, the included angle of the axes of the first helical gear set is 90°, and the included angle of the axes of the second helical gear set is 90°.
[0011] In some embodiments, the rear wheel is equipped with a first flywheel, and the first chainring is connected to the first flywheel via a hinge drive; the front wheel is equipped with a second flywheel, and the second flywheel is connected to the second sprocket via a second chain drive device.
[0012] In some embodiments, the first and second chainrings have 98 teeth, and the first and second freewheels have 22 teeth.
[0013] In some embodiments, the pedal mechanism includes a first pedal and a second pedal, with the first pedal mounted on the side of the first chainring away from the frame and the second pedal mounted on the side of the second chainring away from the frame.
[0014] In some embodiments, the first foot pedal and the second foot pedal are respectively installed in a mounting ring with the center of the first and second cranks as the origin and a radial distance of 0.75R, where R is the effective radius of the cranks.
[0015] This application provides a dual-drive bicycle where both the front and rear wheels provide driving force, greatly improving the bicycle's riding ability. The transmission device drives the front wheel, and the reciprocating motion of a telescopic rod on the transmission device enhances the bicycle's steering flexibility. A direction-changing mechanism changes the transmission direction without affecting power transmission. A universal joint compensates for angular deviations caused by steering, thereby mitigating the impact of the front wheel's rotation angle on the driving front wheel. A large gear ratio is achieved through a large chainring and a small sprocket, allowing the bicycle to adapt to high-speed riding. Optimized pedal placement improves pedaling comfort and efficiency. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of a dual-drive bicycle according to an embodiment of this application.
[0017] Figure 2 This is a schematic diagram of the transmission device according to an embodiment of this application.
[0018] Figure 3 This is a schematic diagram of the structure of the second transmission mechanism according to an embodiment of this application.
[0019] Explanation of reference numerals in the attached figures:
[0020] 1. Frame; 2. Front wheel; 3. Rear wheel; 5. First chainring; 6. Second chainring; 8. First chain drive; 9. Second chain drive; 10. Fixed beam; 11. Diagonal beam; 12. Steering mechanism; 13. First flywheel; 14. Second flywheel; 15. Hinge;
[0021] 4. Foot pedal mechanism; 41. First foot pedal; 42. Second foot pedal;
[0022] 7. Transmission device;
[0023] 71. First direction conversion mechanism; 711. First sprocket; 712. First helical gear set; 713. Output shaft;
[0024] 72. Second direction conversion mechanism; 721. Input shaft; 722. Second helical gear set; 723. Second sprocket;
[0025] 73. Telescopic mechanism; 731. Telescopic rod; 732. Universal joint. Detailed Implementation
[0026] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application will be presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.
[0027] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0028] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on 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.
[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0030] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0031] Please see Figures 1-3 , Figure 1 This is a schematic diagram of a dual-drive bicycle. Figure 2 This is a schematic diagram of the transmission device according to an embodiment of this application. Figure 3 This is a schematic diagram of the structure of the second transmission mechanism according to an embodiment of this application.
[0032] like Figure 1 As shown, this application embodiment provides a dual-drive bicycle, which includes a frame 1, a front wheel 2, a rear wheel 3, and a pedal mechanism 4 mounted on the frame 1. The pedal mechanism 4 has a first chainring 5 and a second chainring 6 coaxially arranged, and the pedal mechanism 4 drives the first chainring 5 and the second chainring 6 to rotate synchronously. The first chainring 5 is driven by the rear wheel 3 and is used to drive the rear wheel 3. The second chainring 6 is driven by the front wheel 2 through a transmission device 7 and is used to drive the front wheel 2. The transmission device 7 includes a first direction conversion mechanism 71 driven by the second chainring 5 and a second direction conversion mechanism 71 driven by the front wheel 2. The transmission mechanism 72 and the telescopic mechanism 73 that connects the first direction conversion mechanism 71 and the second direction conversion mechanism 72 are included. The second chainring 6 drives the first direction conversion mechanism 71 through the first chain drive device 8, which is a hinge. After the first direction conversion mechanism 71 changes the transmission direction, it drives the second direction conversion mechanism 72 through the telescopic mechanism 73. After the second direction conversion mechanism 72 changes the direction of the power output from the telescopic mechanism 73, it drives the front wheel 2 through the second chain drive device 9. The front and rear wheels are driven simultaneously, which can enhance traction and is suitable for complex road surfaces (such as mud and snow).
[0033] In this embodiment, the first chainring 5 and the second chainring 6 preferably have the same number of teeth to ensure the smoothness of the drive of the front wheel 2 and the rear wheel 3.
[0034] In this embodiment of the application, the frame 1 also includes a diagonal beam 11, a fixed beam 10 connecting the seat, and a steering mechanism 12. One end of the diagonal beam 11 is connected to the steering mechanism 12, and the other end is fixed to the middle of the fixed beam 10. The second direction conversion mechanism 72 is provided on the steering mechanism 12, and the first direction conversion mechanism 71 is provided on the diagonal beam 11.
[0035] In this embodiment, the telescopic mechanism 73 includes a telescopic rod 731 and a universal joint 732 disposed on at least one side of the telescopic rod 731. When the steering mechanism 12 rotates, it drives the second direction conversion mechanism 72 to turn synchronously. At this time, the telescopic rod 731 connected to the second direction conversion mechanism 72 reciprocates along the axial direction, improving the flexibility of bicycle steering. The universal joint 732 compensates for the angular deviation between the telescopic rod 73 and the second direction conversion mechanism 72 and / or the first direction conversion mechanism 71 when steering, thereby improving the influence of the rotation angle of the front of the bicycle on the driving front wheel when steering.
[0036] In this embodiment of the application, the first direction conversion mechanism includes a first sprocket 711, at least one set of first helical gears 712 and an output shaft 713; the first sprocket 711 inputs power to the first helical gears 712 by rotating, the first helical gears 712 changes the direction of power, and the output shaft 713 connected to the first helical gears 712 transmits the converted power to the telescopic mechanism 73.
[0037] like Figure 2 As shown, the second chainring 6 drives the first sprocket 711 to rotate via the first chain drive device 8. The first sprocket 711 is coaxially arranged with the driving gear of the first helical gear set 712, and its rotation axis intersects with the axis of the driven gear of the first helical gear set 712. The driven gear is coaxially arranged with the output shaft 713. When the first sprocket 711 rotates, it transmits power to the driven gear through the driving gear coaxially arranged with it. The first helical gear set 712 thereby changes the direction of power transmission, and the output shaft 713 transmits the converted power to the telescopic mechanism 73. The output shaft 713 can be connected to the telescopic mechanism 73 or can be part of the telescopic mechanism 73.
[0038] In this embodiment, the second direction conversion mechanism includes an input shaft 721, at least one set of second helical gears 722, and a second sprocket 723; the telescopic mechanism 73 drives the input shaft 721 to rotate, inputting power to the second helical gears 722, the second helical gears 722 changing the direction of power, and the second sprocket 723 connected to the second helical gears 722 driving the front wheel 2 with the power after the direction conversion.
[0039] like Figure 3 As shown, the telescopic mechanism 73 transmits power to the input shaft 721 through rotation. The input shaft 721 is coaxially arranged with the driving gear of the second helical gear set 722, and its axis intersects with the axis of the driven gear of the second helical gear set 722. The driven gear is coaxially arranged with the second sprocket 723. When the input shaft 721 rotates, the driving gear coaxial with the input shaft 721 transmits power to the driven gear meshing with it. The second helical gear set 722 thereby changes the direction of power transmission and transmits the power to the front wheel 2 through the second sprocket 723. The input shaft 721 can be connected to the telescopic mechanism 73 or can be part of the telescopic mechanism 73.
[0040] In this embodiment of the application, the included angle of the axes of the first helical gear set 712 is 90°, and the included angle of the axes of the second helical gear set 722 is 90°.
[0041] In this embodiment, the rear wheel 3 is equipped with a first freewheel 13, and the first chainring 5 is connected to the first freewheel 13 via a hinge 15. It should be noted that, although... Figure 1 The first chainring 5 and the first flywheel 13 are connected by a hinge 15, but any other transmission assembly capable of transmitting power (such as a belt, shaft drive, etc.) can also be used. The front wheel 2 is equipped with a second flywheel 14, which is connected to the second sprocket 723 by a second chain drive device 9, which is a hinge.
[0042] In this embodiment, the first chainring 5 and the second chainring 6 have 98 teeth, and the first freewheel 13 and the second freewheel 14 have 22 teeth. A large transmission ratio (≈4.45:1) is obtained through the 98 teeth of the chainring and the 22 teeth of the freewheel, which enables the bicycle to adapt to high-speed riding. In addition, the number of teeth in the front and rear transmission systems is consistent, which ensures the balanced driving force of the front and rear wheels and avoids the loss of control caused by slippage on one side.
[0043] In this embodiment, the pedal mechanism 4 includes a first pedal 41 and a second pedal 42. The first pedal 41 is mounted on the side of the first chainring 5 away from the frame 1, and the second pedal 42 is mounted on the side of the second chainring 6 away from the frame 1. The first pedal 41 and the second pedal 42 are respectively mounted within a mounting ring with a radial distance of 0.75R from the center of the first chainring 5 and the center of the second chainring 6, where R is the effective radius of the chainring. Mounting the pedals within a ring with a radius of 0.75R from the center of the chainring shortens the pedaling arm, reduces starting resistance, reduces lateral pressure on the knees during riding, improves pedaling comfort, and increases pedaling efficiency.
[0044] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.
Claims
1. A dual-drive bicycle, comprising a frame, a front wheel, a rear wheel, and a pedal mechanism mounted on the frame, characterized in that, The foot pedal mechanism is coaxially provided with a first toothed chain and a second toothed chain, and the foot pedal mechanism drives the first toothed chain and the second toothed chain to rotate synchronously. The first chainring is connected to the rear wheel drive and is used to drive the rear wheel; The second chainring is connected to the front wheel via a transmission device and is used to drive the front wheel; The transmission device includes a first direction conversion mechanism that is connected to the second chainring, a second direction conversion mechanism that is connected to the front wheel, and a telescopic mechanism that connects the first direction conversion mechanism and the second direction conversion mechanism. The second chainring drives the first direction conversion mechanism through the first chain drive device. After the first direction conversion mechanism changes the transmission direction, it drives the second direction conversion mechanism through the telescopic mechanism. After the second direction conversion mechanism changes the power output from the telescopic mechanism, it drives the front wheel through the second chain drive device.
2. The dual-drive bicycle as described in claim 1, characterized in that, The frame also includes a slant beam, a fixed beam connecting the seat, and a steering mechanism. One end of the slant beam is connected to the steering mechanism, and the other end is fixed to the middle of the fixed beam. The second direction conversion mechanism is disposed on the steering mechanism, and the first direction conversion mechanism is disposed on the slant beam.
3. The dual-drive bicycle as described in claim 2, characterized in that, The telescopic mechanism includes a telescopic rod and a universal joint disposed on at least one side of the telescopic rod; When the steering mechanism rotates, it drives the second direction conversion mechanism to turn synchronously. At this time, the telescopic rod connected to the second direction conversion mechanism reciprocates along the axial direction. The universal joint compensates for the angular deviation between the telescopic rod and the second direction conversion mechanism and / or the first direction conversion mechanism during steering.
4. The dual-drive bicycle as described in claim 3, characterized in that, The first direction conversion mechanism includes a first sprocket, at least one set of first helical gears, and an output shaft. The first sprocket inputs power to the first helical gear set by rotation. The first helical gear set changes the direction of power, and the output shaft connected to the first helical gear set transmits the converted power to the telescopic mechanism.
5. The dual-drive bicycle as described in claim 4, characterized in that, The second direction conversion mechanism includes an input shaft, at least one set of second helical gears, and a second sprocket. The telescopic mechanism drives the input shaft to rotate, inputting power to the second helical gear set. The second helical gear set changes the direction of power, and the second sprocket connected to the second helical gear set drives the front wheel with the power after the direction conversion.
6. The dual-drive bicycle as described in claim 5, characterized in that, The included angle of the axes of the first helical gear set is 90°, and the included angle of the axes of the second helical gear set is 90°.
7. The dual-drive bicycle as described in claim 5, characterized in that, The rear wheel is equipped with a first freewheel, and the first chainring is connected to the first freewheel via a hinge drive; the front wheel is equipped with a second freewheel, and the second freewheel is connected to the second sprocket via a second chain drive device.
8. The dual-drive bicycle as described in claim 7, characterized in that, The first and second cranks have 98 teeth each, and the first and second flywheels have 22 teeth each.
9. The dual-drive bicycle as described in claim 1, characterized in that, The pedal mechanism includes a first pedal and a second pedal. The first pedal is mounted on the side of the first chainring away from the frame, and the second pedal is mounted on the side of the second chainring away from the frame.
10. The dual-drive bicycle as described in claim 9, characterized in that, The first foot pedal and the second foot pedal are respectively installed in the mounting ring with the center of the first and second cranks as the origin and a radial distance of 0.75R, where R is the effective radius of the cranks.