Bicycle rear wheel folding structure and folding bicycle

Abstract

The utility model discloses a bicycle rear wheel folding structure and a folding bicycle. The bicycle rear wheel folding structure comprises a frame and a rear wheel assembly. The frame comprises a main beam pipe and a vertical pipe fixed below the main beam pipe; the rear wheel assembly comprises a rear hub, a five-way center shaft, a gear disc installed on the five-way center shaft, a chain connected between the rear hub and the gear disc and a rear bottom fork fixedly connected between the rear hub and the five-way center shaft. A pivoting bracket is fixed at the bottom end of the vertical pipe; the rear wheel assembly further comprises a second rotating shaft arranged below the five-way middle shaft, the second rotating shaft is rotatably connected with the pivoting support, the rear wheel assembly can integrally rotate around the second rotating shaft when the rear wheel assembly is folded relative to the frame, and the chain is prevented from falling off during folding. The overall structure is simple and operation and use are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle technical field especially a bicycle rear wheel folding structure and folding bicycle. BACKGROUND

[0002] The present manpower bicycle or electric bicycle, in order to reach smaller folding volume, usually set up front wheel assembly, rear wheel assembly can be folded respectively. For the rear wheel folding structure, the existing design is to design the rear wheel folding pivot between the five-way middle shaft and the rear wheel, the gear disc for installing the chain is installed on the five-way middle shaft, the five-way middle shaft and the gear disc all will not be folded with the rear wheel, the RC axial distance (RC axial distance refers to the axial distance between the five-way middle shaft and the rear wheel shaft) changes in the rear wheel folding process, and the chain is prone to falling off. There are also some technical solutions, which prevent the chain from falling off in the folding process by adding a tensioning wheel on the chain, but in actual operation, if the operation is improper, the tensioning wheel cannot play a role, and the chain is still prone to falling off in the rear wheel folding process. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art, proposes a bicycle rear wheel folding structure and folding bicycle, provides the whole folding of the rear wheel assembly without changing the RC axial distance so that the chain will not fall off in the folding process.

[0004] The utility model provides a bicycle rear wheel folding structure, including frame and rear wheel assembly, the frame includes the main beam pipe and the vertical pipe of being fixed in the lower part of main beam pipe, the rear wheel assembly includes rear wheel hub, five-way middle shaft, gear disc of being installed on five-way middle shaft, chain of being connected between rear wheel hub and gear disc and rear fork of being fixedly connected between rear wheel hub and five-way middle shaft, the bottom of vertical pipe is fixed with pivot support, the rear wheel assembly still includes the second rotation axis of being set below five-way middle shaft, and the second rotation axis is rotatablely connected with pivot support, when folding operation is done to the rear wheel assembly relative to frame, makes the rear wheel assembly can rotate as a whole around the second rotation axis.

[0005] In a preferred embodiment, the pivot support has a C-shaped slot, and the slot opening of the C-shaped slot is arranged towards the rear wheel hub; in the unfolded state where the rear wheel assembly is not folded relative to the frame, the five-way middle shaft is located in the C-shaped slot.

[0006] In a preferred embodiment, one of the bottom end of the pivot support and the five-way middle shaft is provided with a pivot seat, and the other is provided with a rotation bearing seat, the second rotation axis is fixed in the rotation bearing seat and rotatably connected with the pivot seat.

[0007] In a preferred embodiment, a pivot seat is located at the bottom end of the pivot bracket, and a swivel bearing seat is located below the bottom bracket shaft; the pivot bracket is also provided with a locking component, which cooperates with the swivel bearing seat to lock and fix the connection state between the frame and the rear wheel assembly.

[0008] In a preferred embodiment, the swivel bearing housing has a first locking position and a second locking position; in the unfolded state where the rear wheel assembly is not folded relative to the frame, the locking component engages with the first locking position; in the folded state where the rear wheel assembly is rotated and folded to one side of the frame, the locking component engages with the second locking position.

[0009] In a preferred embodiment, the locking component includes a spring-loaded pin.

[0010] In a preferred embodiment, the riser includes a front riser and a middle riser, which are respectively fixedly connected to the front end and the rear end of the main beam pipe. The lower ends of the front riser and the middle riser are both fixedly connected to a pivot bracket.

[0011] In a preferred embodiment, the second rotating shaft is located below the bottom bracket and offset to the side closer to the rear wheel hub.

[0012] Accordingly, this utility model also discloses a folding bicycle, which adopts the aforementioned bicycle rear wheel folding structure.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention employs a folding structure between the rear wheel assembly and the frame of a folding bicycle. By fixing the second rotating shaft below the bottom bracket of the rear wheel assembly, the rear wheel assembly functions as a single unit, rotating relative to the frame around the second rotating shaft for folding or unfolding, supported by the pivot seat of the pivot bracket. The RC wheelbase of the rear wheel assembly remains unchanged during folding or unfolding, thus preventing the chain from falling off during folding. The overall structure is simple and easy to operate. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of the bicycle of this utility model.

[0016] Figure 2 This is a structural diagram of the vehicle frame.

[0017] Figure 3 This is a structural diagram of the rear wheel assembly.

[0018] Figure 4 This is a schematic diagram of the rear wheel assembly folding process.

[0019] Figure 5 This is a top view of the bicycle with the rear wheel assembly folded to one side of the frame.

[0020] The meanings of the labels in the diagram are as follows: 1. Frame; 11. Main beam tube; 12. Head tube; 13. Front seat tube; 14. Center seat tube; 15. Pivot bracket; 16. Pivot seat; 17. Locking assembly; 2. Front wheel assembly; 21. Front hub; 22. Front fork; 3. Rear wheel assembly; 31. Rear hub; 32. Rear swingarm; 33. Bottom bracket; 34. Gear sprocket; 35. Chain; 36. Slewing bearing seat; 37. First locking position; 62. Second slewing shaft. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this application to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0022] like Figure 1 As shown, the folding bicycle includes a frame 1, a front wheel assembly 2 connected to the front end of the frame 1, a rear wheel assembly 3 connected to the rear end of the frame 1, a handlebar assembly connected to the top of the front end of the frame 1, and a saddle assembly inserted into the upper end of the seat tube.

[0023] The frame 1 includes a main beam tube 11 and a riser tube fixed below the main beam tube 11. Preferably, the riser tube includes a front riser tube 13 and a middle riser tube 14, which are fixedly connected to the front end and rear end of the main beam tube 11, respectively. The main beam tube 11, the front riser tube 13 and the middle riser tube 14 are connected to form a stable triangular support structure, making the overall structure of the frame 1 firm and reliable.

[0024] The saddle assembly is typically inserted into the top of the front seat tube 13. The frame 1 also includes a head tube 12 located at the front end of the main beam tube 11, and the handlebar assembly is connected to the frame 1 via the head tube 12. The front wheel assembly 2 includes a front wheel hub 21 and a front fork 22 connected between the front wheel hub 21 and the head tube 12.

[0025] Further integration Figures 2-5 As shown. The rear wheel assembly 3 of the folding bicycle adopts a folding structure between itself and the frame 1. In particular, the rear wheel assembly 3 rotates relative to the frame 1 as a whole to fold or unfold without changing the RC wheelbase of the rear wheel assembly 3, thereby preventing the chain from falling off when folding.

[0026] Specifically, this utility model proposes a bicycle rear wheel folding structure, including a frame 1 and a rear wheel assembly 3. The rear wheel assembly 3 has a folded state where it is rotated and folded to one side of the frame 1, and an unfolded state or a use state where it is unfolded and connected to the rear end of the frame 1.

[0027] The rear wheel assembly 3 includes a rear wheel hub 31, a bottom bracket axle 33, a gear disc 34 mounted on the bottom bracket axle 33, a chain 35 connecting the rear wheel hub 31 and the gear disc 34, and a rear horizontal fork 32 fixedly connected between the rear wheel hub 31 and the bottom bracket axle 33.

[0028] In addition, a pivot bracket 15 is fixed to the bottom of the riser, and the lower ends of the front riser 13 and the middle riser 14 are fixedly connected to the pivot bracket 15.

[0029] The rear wheel assembly 3 also includes a second rotating shaft 62 located below the bottom bracket 33. The second rotating shaft 62 is rotatably connected to the pivot bracket 15. When the rear wheel assembly 3 is folded relative to the frame 1, the rear wheel assembly 3 can rotate around the second rotating shaft 62 as a whole without changing the RC wheelbase of the rear wheel assembly 3 (RC wheelbase refers to the wheelbase between the bottom bracket 33 and the rear wheel axle of the rear wheel hub 31), thus preventing the chain 35 from falling off due to changes in the RC wheelbase during the folding operation.

[0030] The pivot bracket 15 has a C-shaped groove with the opening of the C-shaped groove facing the rear wheel hub 31. When the rear wheel assembly 3 is not folded relative to the frame 1 in the unfolded state, the bottom bracket axle 33 is located in the C-shaped groove, so that the overall connection structure between the rear wheel assembly 3 and the frame 1 in the unfolded state is more compact and robust.

[0031] The rear wheel assembly 3 and the frame 1 are rotatably connected via a pivot bracket 15 and a second rotating shaft 62, allowing for switching between folded and unfolded states as needed. Specifically, a pivot seat 16 is provided at the bottom of the pivot bracket 15 and at one of the bottom bracket shafts 33, while a swivel bearing seat 36 is provided at the other. The second rotating shaft 62 is fixed in the swivel bearing seat 36 and rotatably connected to the pivot seat 16.

[0032] In a preferred embodiment, the pivot seat 16 is located at the bottom end of the pivot bracket 15, and the swivel bearing seat 36 is located below the bottom bracket shaft 33; the pivot bracket 15 is also provided with a locking component 17, which cooperates with the swivel bearing seat 36 to lock and fix the connection state between the frame 1 and the rear wheel assembly 3.

[0033] The locking component 1 can employ any of the existing locking structures. For example, the locking component 17 includes a spring-loaded pin.

[0034] Correspondingly, the swivel bearing housing 36 has a first locking position 37 and a second locking position (not shown in the figure); in the unfolded state where the rear wheel assembly 3 is not folded relative to the frame 1, the locking component 17 is locked in place with the first locking position 37, for example, the end of the pin is inserted into the first locking position 37, and the spring generates a sufficiently large locking force on the pin to keep the end of the pin inserted in the first locking position 37; in the folded state where the rear wheel assembly 3 is rotated and folded to one side of the frame 1, the locking component 17 is locked in place with the second locking position.

[0035] In a preferred embodiment, the second rotating shaft 62 is positioned below the bottom bracket 33 and offset towards the rear wheel hub 31; that is, the second rotating shaft 62 is located slightly rearward below the bottom bracket 33. The advantage of this structure is that, since the rear wheel assembly 3 of this invention rotates and folds relative to the frame 1, and considering the relatively large wheelbase of the rear wheel assembly 3, the second rotating shaft 62 is positioned slightly rearward relative to the bottom bracket 33. This prevents the rear wheel hub 31 from extending excessively beyond the front of the frame 1 when the rear wheel assembly 3 is folded, thus minimizing the overall size of the bicycle after folding and making it easier to store.

[0036] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A bicycle rear wheel folding structure, comprising a frame and a rear wheel assembly; the frame includes a main beam tube and a seat tube fixed below the main beam tube; the rear wheel assembly includes a rear wheel hub, a bottom bracket, a sprocket mounted on the bottom bracket, a chain connecting the rear wheel hub and the sprocket, and a rear swingarm fixedly connected between the rear wheel hub and the bottom bracket; characterized in that: The bottom end of the riser is fixed with a pivot bracket; The rear wheel assembly also includes a second rotating shaft located below the bottom bracket. The second rotating shaft is rotatably connected to the pivot bracket, allowing the entire rear wheel assembly to rotate around the second rotating shaft when the rear wheel assembly is folded relative to the frame.

2. The bicycle rear wheel folding structure according to claim 1, characterized in that: The pivot bracket has a C-shaped groove with the opening of the C-shaped groove facing the rear wheel hub; in the unfolded state where the rear wheel assembly is not folded relative to the frame, the bottom bracket axle is located in the C-shaped groove.

3. The bicycle rear wheel folding structure according to claim 1, characterized in that: A pivot seat is provided at the bottom of the pivot bracket and on one of the bottom bracket shafts, while a swivel bearing seat is provided on the other. The second rotating shaft is fixed in the swivel bearing seat and rotatably connected to the pivot seat.

4. The bicycle rear wheel folding structure according to claim 3, characterized in that: The pivot seat is located at the bottom end of the pivot bracket, and the swivel bearing seat is located below the bottom bracket shaft; The pivot bracket is also equipped with a locking component, which cooperates with the swivel bearing seat to lock and fix the connection between the frame and the rear wheel assembly.

5. The bicycle rear wheel folding structure according to claim 4, characterized in that: The swivel bearing housing has a first locking position and a second locking position; in the unfolded state where the rear wheel assembly is not folded relative to the frame, the locking component engages with the first locking position; in the folded state where the rear wheel assembly is rotated and folded to one side of the frame, the locking component engages with the second locking position.

6. The bicycle rear wheel folding structure according to claim 4, characterized in that: The locking assembly includes a spring-loaded pin.

7. The bicycle rear wheel folding structure according to claim 1, characterized in that: The riser includes a front riser and a middle riser, which are fixedly connected to the front and rear ends of the main beam pipe, respectively. The lower ends of the front riser and the middle riser are both fixedly connected to the pivot bracket.

8. The bicycle rear wheel folding structure according to any one of claims 1-7, characterized in that: The second rotating shaft is located below the bottom bracket and is offset to the side closer to the rear wheel hub.

9. A folding bicycle, characterized in that, The bicycle rear wheel folding structure described in any one of claims 1-8 is adopted.

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