A novel quick-release structure for tandem bicycle wheels

Abstract

This utility model relates to the field of bicycle technology and discloses a novel quick-release structure for a tandem bicycle wheel, including a main shaft, a main shaft and freewheel connector, a freewheel, a first freewheel clamp, a second freewheel clamp, a freewheel connecting fixing plate, a hub, and a brake disc. The main shaft is detachably connected to the freewheel connector through a fixing pin hole; the freewheel connector is connected to the inner ring of the freewheel through a self-tightening thread. This utility model connects the main shaft and the freewheel connector through a hub extension pin, uses a self-tightening thread to connect the freewheel and the freewheel connector, and bolts pass through the freewheel clamp and fixing plate to form a modular quick-release mechanism. The brake disc is fixed to the hub, allowing the braking system to be adjusted without adjustment during quick wheel release. The sliding engagement of the inner and outer rings of the freewheel replaces the traditional differential, eliminating the need for a two-stage transmission structure. Differential rotation between the hub and the main shaft is achieved through a hub bearing, and the design is compatible with standard bicycle components, reducing costs.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and more specifically, to a novel quick-release structure for the wheels of a tandem bicycle. Background Technology

[0002] A bicycle, also known as a pedal bike or cyclist, is a small, two-wheeled land vehicle. It is powered by pedaling and is a green and environmentally friendly mode of transportation. A tandem bicycle is a type of bicycle designed for two people to ride and drive together.

[0003] Tandem bicycles are typically 1.5 to 2 times the length of regular bicycles, making them difficult to fit in the trunk of a car or in home storage space. Removing the front and rear wheels can significantly shorten the length, making them easier to load into a vehicle or store upright. However, tandem bicycles are heavier, and in the event of a tire blowout or wheel damage, flipping the bicycle and removing the wheels is more strenuous than with a regular bicycle. Therefore, improvements are needed. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a novel quick-release structure for the wheels of a two-person bicycle, which has the advantage of being easy to disassemble.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel quick-release structure for a tandem bicycle wheel, comprising a main shaft, a main shaft and freewheel connector, a freewheel, a first freewheel clamp, a second freewheel clamp, a freewheel connecting fixing plate, a hub, and a brake disc. The main shaft is detachably connected to the freewheel connector via a fixing pin hole. The freewheel connector is connected to the inner ring of the freewheel via a self-tightening thread. The first freewheel clamp, the toothed freewheel, and the second freewheel clamp are sequentially threaded through by bolts and connected to the freewheel connecting fixing plate via threads. The freewheel connecting fixing plate is connected to the hub via a pin hole and a hub extension pin. A hub bearing is provided inside the hub, allowing the hub to rotate freely relative to the main shaft. A bearing bracket is provided on the outer side of the main shaft.

[0006] As a preferred technical solution of this utility model, the flywheel includes inner ring teeth and outer ring teeth; when the main shaft rotates in the forward direction, the inner ring teeth drive the outer ring teeth to rotate synchronously; when there is a speed difference between the two wheels, the outer ring teeth of the flywheel on the slower side can slide relative to the inner ring teeth.

[0007] As a preferred technical solution of this utility model, the connecting thread between the flywheel link and the flywheel is a self-tightening design.

[0008] As a preferred technical solution of this utility model, the bolt is a stepped shaft structure; its large diameter section is matched with the flywheel clamping plate, and its small diameter section is threadedly connected to the flywheel connecting fixing plate.

[0009] As a preferred embodiment of this utility model, the hub bearing is an angular contact ball bearing; the inner ring of the hub bearing is interference-fitted with the main shaft, and the outer ring is transition-fitted with the hub.

[0010] As a preferred technical solution of this utility model, the threads of the two flywheels are arranged in opposite directions; the heat dissipation structures of the two brake discs are arranged in a mirror symmetrical manner.

[0011] As a preferred technical solution of this utility model, when the speeds of the two wheels are the same, the inner and outer rings of the flywheel rotate synchronously; when there is a speed difference, the outer ring of the flywheel on the slower side slides relative to the inner ring; the relative rotation of the hub and the main shaft is achieved through the hub bearing.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This utility model connects the main shaft and the flywheel link through a hub extension pin, and uses a self-tightening thread to connect the flywheel and the flywheel link. Bolts pass through the flywheel clamp and the fixing plate to form a modular quick-release mechanism. The brake disc is fixed to the hub so that the braking system does not need to be adjusted when the wheel is quickly released. The sliding engagement of the inner and outer rings of the flywheel replaces the traditional differential, eliminating the need for a two-stage transmission structure. Differential rotation between the hub and the main shaft is achieved through the hub bearing. It is compatible with standard bicycle parts and reduces costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the exploded structure of the main shaft of this utility model;

[0016] Figure 3 for Figure 2 A magnified schematic diagram of the local structure at point A;

[0017] Figure 4 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point B in the middle.

[0019] In the diagram: 1. Main shaft; 2. Flywheel connector; 3. Flywheel; 4. Bearing bracket; 5. Fixing pin hole; 6. Bolt; 7. Flywheel clamp one; 8. Brake disc; 9. Flywheel clamp two; 10. Pin hole; 11. Flywheel connecting fixing plate; 12. Hub extension pin; 13. Hub; 14. Hub bearing. Detailed Implementation

[0020] 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.

[0021] like Figures 1 to 5 As shown, this utility model provides a novel quick-release structure for a tandem bicycle wheel, including a main shaft 1, a main shaft and freewheel connector 2, a freewheel 3, a first freewheel clamp 7, a second freewheel clamp 9, a freewheel connecting fixing plate 11, a wheel hub 13, and a brake disc 8. The main shaft 1 is detachably connected to the freewheel connector 2 through a fixing pin hole 5; the freewheel connector 2 is connected to the inner ring of the freewheel 3 through a self-tightening thread; the first freewheel clamp 7, the toothed part of the freewheel 3, and the second freewheel clamp 9 are sequentially threaded through by bolts 6 and connected to the freewheel connecting fixing plate 11; the freewheel connecting fixing plate 11 is connected to the wheel hub 13 through a pin hole 10 and a wheel hub extension pin 12; a wheel hub bearing 14 is provided inside the wheel hub 13, allowing the wheel hub 13 to rotate freely relative to the main shaft 1; a bearing bracket 4 is provided on the outer side of the main shaft 1.

[0022] Use a special tool to rotate the wheel locking bolt 6 counterclockwise to release the fixed connection between the hub 13 and the flywheel connecting plate 11; pull out the hub extension pin 12 axially to separate the hub 13 from the flywheel connecting plate 11; use a wrench to loosen the bolt 6 and remove it from the flywheel connecting plate 11, flywheel clamp 9, flywheel 3 teeth, and flywheel clamp 7 in sequence; remove the flywheel clamp 7, flywheel 3, flywheel clamp 9, and flywheel connecting plate 11 as a whole from the main shaft 1; if the flywheel 3 needs to be completely disassembled, the flywheel connector 2 can be rotated counterclockwise to separate it from the inner ring thread of the flywheel 3; if the bearing bracket 4 and hub bearing 14 need to be replaced or maintained, the main shaft 1 can be pulled out axially.

[0023] It achieves quick-release wheels and braking system without interference, quick wheel insertion and removal while the brake disc and brake unit remain stationary; it eliminates the differential and reduces the secondary transmission, reducing weight and saving costs by utilizing existing bicycle components; and it enables multiple power input points on a single axle.

[0024] The flywheel 3 includes inner and outer ring teeth. When the main shaft 1 rotates in the forward direction, the inner ring teeth drive the outer ring teeth to rotate synchronously. When there is a speed difference between the two wheels, the outer ring teeth of the flywheel 3 on the slower side can slide relative to the inner ring teeth. The connection thread between the flywheel connector 2 and the flywheel 3 is a self-tightening design. The bolt 6 has a stepped shaft structure. Its large diameter section mates with the flywheel clamp 7, and its small diameter section is threadedly connected to the flywheel connecting fixing plate 11. The hub bearing 14 is an angular contact ball bearing. The inner ring of the hub bearing 14 is interference-fitted with the main shaft 1, and the outer ring is transition-fitted with the hub 13. The threads of the two flywheels 3 are set in opposite directions. The heat dissipation structures of the two brake discs 8 are arranged in a mirror symmetrical manner. When the speeds of the two wheels are the same, the inner and outer rings of the flywheel 3 rotate synchronously. When there is a speed difference, the outer ring of the flywheel 3 on the slower side slides relative to the inner ring. The relative rotation between the hub 13 and the main shaft 1 is achieved through the hub bearing 14.

[0025] The main shaft 1 is connected to the freewheel link 2 by the hub extension pin 12, and the freewheel 3 is connected to the freewheel link 2 by a self-tightening thread. The bolt 6 passes through the freewheel clamp and the fixing plate to form a modular quick release. The brake disc 8 is fixed to the hub 13 so that the braking system does not need to be adjusted when the wheel is quickly released. The inner and outer rings of the freewheel 3 are used to replace the traditional differential, eliminating the need for a two-stage transmission structure. The hub bearing 14 enables the differential rotation of the hub 13 and the main shaft 1, which is compatible with standard bicycle parts and reduces costs.

[0026] Working principle and usage process of this utility model:

[0027] Use a special tool to rotate the wheel locking bolt 6 counterclockwise to release the fixed connection between the hub 13 and the flywheel connecting plate 11; pull out the hub extension pin 12 axially to separate the hub 13 from the flywheel connecting plate 11; use a wrench to loosen the bolt 6 and remove it from the flywheel connecting plate 11, flywheel clamp 9, flywheel 3 teeth, and flywheel clamp 7 in sequence; remove the flywheel clamp 7, flywheel 3, flywheel clamp 9, and flywheel connecting plate 11 as a whole from the main shaft 1; if the flywheel 3 needs to be completely disassembled, the flywheel connector 2 can be rotated counterclockwise to separate it from the inner ring thread of the flywheel 3; if the bearing bracket 4 and hub bearing 14 need to be replaced or maintained, the main shaft 1 can be pulled out axially.

[0028] 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 process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel quick-release structure for a tandem bicycle wheel, comprising a main shaft (1), a main shaft and freewheel connector (2), a freewheel (3), a first freewheel clamp (7), a second freewheel clamp (9), a freewheel connecting fixing piece (11), a wheel hub (13), and a brake disc (8), characterized in that: The main shaft (1) is detachably connected to the flywheel connector (2) through the fixing pin hole (5); the flywheel connector (2) is connected to the inner ring of the flywheel (3) through the self-tightening thread; the flywheel clamping plate one (7), the tooth gap of the flywheel (3), and the flywheel clamping plate two (9) are sequentially passed through by bolts (6) and threadedly connected to the flywheel connecting fixing plate (11); the flywheel connecting fixing plate (11) is connected to the hub (13) through the pin hole (10) and the hub extension pin (12); the hub (13) is provided with a hub bearing (14) so ​​that the hub (13) can rotate freely relative to the main shaft (1); a bearing bracket (4) is provided on the outside of the main shaft (1).

2. A quick release structure for a bicycle wheel for two persons as claimed in claim 1, wherein: The flywheel (3) includes inner teeth and outer teeth; when the main shaft (1) rotates in the forward direction, the inner teeth drive the outer teeth to rotate synchronously; when there is a speed difference between the two wheels, the outer teeth of the flywheel (3) on the slower side can slide relative to the inner teeth.

3. The quick release structure of a new type of bicycle wheel for two persons as claimed in claim 1, wherein: The connection thread between the flywheel link (2) and the flywheel (3) is a self-tightening design.

4. The quick release structure of a new type of bicycle wheel for two persons as claimed in claim 1, wherein: The bolt (6) has a stepped shaft structure; its large diameter section is matched with the flywheel clamp (7), and its small diameter section is threadedly connected to the flywheel connecting fixing plate (11).

5. The quick release structure of a new type of bicycle wheel for two persons as claimed in claim 1, wherein: The hub bearing (14) is an angular contact ball bearing; the inner ring of the hub bearing (14) is interference-fitted with the main shaft (1), and the outer ring is transition-fitted with the hub (13).

6. A quick release structure for a bicycle wheel for two persons as claimed in claim 1, wherein: The threads of the flywheels (3) on both sides are arranged in opposite directions; the heat dissipation structures of the brake discs (8) on both sides are arranged in a mirror symmetrical manner.

7. The quick release structure of a new type of bicycle wheel for two persons as claimed in claim 1, wherein: When the speeds of the two wheels are the same, the inner and outer rings of the flywheel (3) rotate synchronously; when there is a speed difference, the outer ring of the flywheel (3) on the slower side slides relative to the inner ring; the relative rotation of the hub (13) and the main shaft (1) is achieved through the hub bearing (14).

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