A three-fold electric-assisted bicycle

Abstract

This utility model relates to a three-fold electric-assist bicycle. It includes a fork tube, seat post, mid-drive motor, and frame. A fork assembly is installed inside the fork tube, and a main beam is installed between the fork tube and the seat post. The lower end of the seat post is fixedly connected to the mid-drive motor. A first folding mechanism is provided on the stem of the fork assembly. The main beam is divided into a front section and a rear section, with a second folding mechanism between them. The bottom front part of the frame is hinged to the rear part of the mid-drive motor. A third folding mechanism is provided between the top front part of the frame and the upper part of the seat post. The third folding mechanism consists of a locking element and a connecting element that can be joined and separated. The locking element is located on the seat post, and the connecting element is located on the frame. A rear rack is also installed on the top of the frame. A front roller is installed at the front of the frame, and a rear roller is installed at the rear of the rear rack. This utility model provides a three-fold electric-assist bicycle with a deep folding feature, making it easy to move after deep folding.

Description

Technical Field

[0001] This utility model belongs to the field of bicycle technology, and in particular relates to a three-fold electric-assisted bicycle. Background Technology

[0002] Currently, e-bikes are playing an increasingly important role in people's daily lives, meeting their needs for transportation, cycling, and outdoor sports. People are placing higher and higher demands on the portability of e-bikes, such as carrying them with them when driving outdoors. This requires e-bikes to have good folding capabilities to reduce the space they occupy and improve portability. On the other hand, it also requires that the bicycles be easy to move after folding, reducing the burden of transporting them.

[0003] Existing folding bicycles still have room for improvement in terms of the depth of folding and mobility after folding, requiring the development and design of the structure of electric-assisted bicycles. Utility Model Content

[0004] The purpose of this invention is to provide a three-fold electric-assist bicycle with deep folding characteristics, which makes it easy to move after folding.

[0005] The technical solution adopted by this utility model is as follows: a three-fold electric-assist bicycle, including a fork tube, a seat post, a mid-drive motor, and a frame. A fork assembly is installed inside the fork tube, and a main beam is installed between the fork tube and the seat post. The lower end of the seat post is fixedly connected to the mid-drive motor. A first folding device is provided on the stem of the fork assembly. The main beam is divided into a front section and a rear section, and a second folding device is provided between the two. The bottom front part of the frame is hinged to the rear part of the mid-drive motor. A third folding device is provided between the top front part of the frame and the upper part of the seat post. The third folding device consists of a locking element and a connecting element that can be joined and separated. The locking element is located on the seat post, and the connecting element is located on the frame. A rear rack is also installed on the top of the frame. A front roller is installed on the front part of the frame, and a rear roller is installed on the rear part of the rear rack. When the third folding device is in the separated state, the frame can be flipped forward, and the front roller and the rear roller are transferred to the bottom to form the driving wheels.

[0006] Preferably, a diagonal brace is installed between the middle of the rear section of the main beam and the front of the mid-mounted motor, and the vehicle controller is installed in the space between the rear section of the main beam, the diagonal brace, and the mid-mounted motor.

[0007] Preferably, a saddle tube is inserted into the seat tube, and the locking element also serves as an adjusting fastener for the saddle tube. A battery assembly is installed inside the saddle tube, and a seat assembly is installed on top of the battery assembly.

[0008] Preferably, the locking component includes a clamp sleeved on the seat post, bases on both sides of the clamp opening and a connecting shaft between the bases, an adjusting arm hinged to one end of the connecting shaft for tightening and releasing the bases to operate the clamp's tightening and releasing, a locking plate with locking teeth in the middle of the connecting shaft, and a wrench at the bottom of the locking plate; the connecting component includes a base plate fixed to the frame, a connecting rod extending forward on the base plate, a connecting end with a groove at the bottom at the front end of the connecting rod, a pushing plate behind the connecting end, and a spring between the pushing plate and the base plate.

[0009] Preferably, the frame includes two sets of left and right horizontal forks and a rear vertical fork. A rear fork plate is provided between the rear ends of the horizontal forks and the rear vertical fork. A front vertical fork is installed at the front end of the horizontal forks. The upper end of the front vertical fork is fixedly connected to the upper end of the rear vertical fork and the upper end of the front vertical fork is bent outward to form a wheel support for the front roller. The base plate of the connecting component is installed between the upper ends of the two front vertical forks.

[0010] Preferably, a connecting beam is installed between the middle of the two rear upright forks, a support plate is installed below the front of the rear hanger and the bottom of the support plate is fixedly connected to the connecting beam, and the rear sides of the rear hanger are fixedly connected to the left and right rear fork plates respectively by two left and right support rods.

[0011] Preferably, a bushing is installed and fixed at the rear of the back hanger, and two axles are inserted and installed at both ends of the bushing. The two rear rollers are respectively installed and fixed at the outer ends of the two axles. The distance between the two rear rollers is adjusted by extending and retracting the axles within the bushing.

[0012] Preferably, a chain and a foot pedal assembly are mounted on the output shaft of the mid-drive motor.

[0013] The advantages and positive effects of this utility model are:

[0014] This utility model provides a three-fold electric-assist bicycle. Compared with existing electric-assist bicycles, this electric-assist bicycle is equipped with a first folding mechanism, a second folding mechanism, and a third folding mechanism on the frame. Operating the first folding mechanism can fold the front part of the bicycle, namely the front fork. Operating the second folding mechanism can fold the main beam of the bicycle. Operating the third folding mechanism can disconnect the frame and its accessories from the seat post and flip the frame and its accessories forward until the front roller and rear roller are at the bottom to form the driving wheels. Therefore, this three-fold electric-assist bicycle can be deeply folded, and the space occupied after being fully folded is significantly reduced, which is convenient for carrying when going out.

[0015] As mentioned earlier, after being deeply folded, the front and rear rollers of this electric-assist bicycle flip to the bottom to form the walking wheels, making it easy to push and move on the ground, reducing the burden of operation and improving the convenience of use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention, from a frontal view.

[0017] Figure 2 This is a three-dimensional structural schematic diagram of the present invention, from a rear view.

[0018] Figure 3 This is a three-dimensional structural diagram of the rear of this utility model;

[0019] Figure 4 yes Figure 3 A schematic diagram of the locking mechanism of the third folding device;

[0020] Figure 5 yes Figure 3 A schematic diagram of the structure of the connecting component of the third folding device;

[0021] Figure 6 This is a three-dimensional structural diagram of the present invention in a fully folded state.

[0022] In the picture:

[0023] 1. Front wheel; 2. Connector; 3. Headlight; 4. First folding mechanism; 5. Fork tube; 6. Front section of main beam; 7. Clamp; 8. Stem; 9. Second folding mechanism; 10. Rear section of main beam; 11. Diagonal brace; 12. Controller; 13. Third folding mechanism; 13-1. Locking element; 13-2. Connecting element; 14. Saddle tube; 15. Chainring; 16. Mid-drive motor; 17. Seat post; 18. Frame; 18-1. Front inverted fork; 18-2. Rear inverted fork; 18-3. Connecting beam; 18-4. Swing fork; 18-5. Rear fork leaf spring; 19. Rear wheel; 20. Battery assembly; 21. Front roller; 22. Brake assembly; 23. Seat assembly; 24. Rear rack; 25. Rear roller; 26. Handlebar assembly; 27. Support rod; 28. Support plate. Detailed Implementation

[0024] To further understand the invention content, features and effects of this utility model, the following embodiments are provided in detail.

[0025] Please see Figure 1 and Figure 2This utility model discloses a three-fold electric-assist bicycle, comprising a fork tube 5, a seat post 17, a mid-mounted motor 16, and a frame 18. A front fork assembly, consisting of a front fork and a stem 8, is installed inside the fork tube 5. The stem 8 is fixedly mounted on the top of the front fork and located inside the fork tube 5. A front wheel 1 is mounted on the stem 8. A brake assembly 22 acting on the front wheel 1 and a front fender acting on the front wheel 1 can also be mounted on the top of the front fork. A handlebar assembly 26 is mounted on the top of the stem 8, with its middle section fixedly connected to the upper end of the stem 8. The handlebar assembly 26 also includes a handbrake, a gear controller, and a speed regulator. A headlight 3 can also be mounted on the front of the fork tube 5. A rear wheel 19 is mounted on the frame 18.

[0026] A first folding device 4 is provided on the stem 8 of the front fork assembly, as shown in the figure. The first folding device 4 is located above the front fork tube 5. The first folding device 4 is a hinge-type folding device, so when the first folding device 4 is unlocked, the stem 8 and its handlebar assembly 26 can be folded to the side around the hinge axis of the first folding device 4, and finally the stem 8 and its handlebar assembly 26 are folded to the side of the front wheel 1. In order to lock the folded stem 8 and its handlebar assembly 26 and prevent wobbling, a front locking device can be provided at the front. The front locking device includes a locking seat 2 located on the top side of the front fork and a locking block 7 located on the side of the stem 8. After the stem 8 and its handlebar assembly 26 are folded to the side and downward, the locking block 7 is locked into the locking groove of the locking seat 2. Therefore, when this electric-assist bicycle is in the folded state, locking the stem 8 can improve the overall integrity and prevent arbitrary wobbling.

[0027] A main beam is installed between the fork tube 5 and the seat tube 17, and the lower end of the seat tube 17 is fixedly connected to the housing of the mid-drive motor 16. The main beam is divided into a front section 6 and a rear section 10, with a second folding device 9 between them. In this embodiment, a diagonal brace 11 is installed between the middle of the rear section 10 and the front of the housing of the mid-drive motor 16. The diagonal brace 11 is used to improve the overall structural strength of the bicycle. The controller 12 of the whole vehicle is installed in the space between the rear section 10, the diagonal brace 11, and the mid-drive motor 16. The electronic control components of the bicycle, such as the mid-drive motor 16 and the speed controller of the handlebar assembly 26, are connected to the controller 12 through a wiring harness.

[0028] The second folding device 9 is a hinged folding device, so when the second folding device 9 is unlocked, the front section 6 and the rear section 10 of the main beam can be folded together, and finally the front wheel 1 is transferred to the side of the rear wheel 19.

[0029] A sprocket 15 and pedal assembly are mounted on the output shaft of the mid-drive motor 16, and a sprocket is mounted on the axle of the rear wheel 19. Chain drive is used between the sprocket 15 and the sprocket. Alternatively, a derailleur assembly could be configured for the rear wheel 19, allowing gear shifting by controlling the chain to different sprockets on the handlebar assembly 26 via a shift controller. An overrunning clutch is provided between the mid-drive motor 16 and the pedal assembly. When riding this electric-assist bicycle, the rider uses the pedal assembly for pedal drive, and when necessary, the mid-drive motor 16 intervenes to provide electric assistance and reduce riding fatigue. The connection structure between the mid-drive motor 16 and the pedal assembly is existing technology and will not be described in detail.

[0030] Please see Figure 1 and Figure 3 It can be seen that:

[0031] The front bottom of the frame 18 is hinged to the rear of the housing of the mid-drive motor 16. A third folding device 13 is provided between the front top of the frame 18 and the upper part of the seat post 17. The third folding device 13 consists of a locking member 13-1 and a connecting member 13-2 that can be engaged and disengaged. The locking member 13-1 is located on the seat post 17, and the connecting member 13-2 is located on the frame 18. When the locking member 13-1 and the connecting member 13-2 are disengaged, the frame 18 and its associated components can be flipped forward around the hinge axis between the frame 18 and the mid-drive motor 16. Combined with the aforementioned rearward folding of the front wheel 1, a three-fold deep fold is finally completed, forming... Figure 6 The folded state shown.

[0032] In this embodiment, the frame 18 includes two sets of horizontal forks 18-4 on the left and right and a rear vertical fork 18-2. A rear fork plate 18-5 is provided between the rear ends of the horizontal forks 18-4 and the rear vertical fork 18-2. A front vertical fork 18-1 is installed at the front end of the horizontal forks 18-4. The upper end of the front vertical fork 18-1 is fixedly connected (welded) to the upper end of the rear vertical fork 18-2 and the upper end of the front vertical fork 18-1 is bent outward. The front ends of the two horizontal forks 18-4 are located on both sides of the housing of the central motor 16 and are hinged to the central motor 16 by a hinge shaft.

[0033] A rear rack 24 is also installed on the top of the frame 18, a front roller 21 is installed at the front of the frame 18, and a rear roller 25 is installed at the rear of the rear rack 24. When the third folding mechanism 13 is in the disengaged state, the frame 18 can be flipped forward, and the front roller 21 and rear roller 25 are transferred to the bottom to form the driving wheels. In this way, when the electric folding bicycle is in the deeply folded state, it is easier to move due to the driving wheels at the bottom, and can be dragged on the ground, reducing the burden of operation.

[0034] In this embodiment, as shown Figure 3As shown, the upper ends of the two front upright forks 18-1 bend outwards, thus forming the wheel support of the front roller 21, that is, the front roller 21 is installed and fixed on the upper outer end of the front upright fork 18-1.

[0035] In this embodiment, a connecting beam 18-3 is installed between the middle of the two rear upright forks 18-2. A support plate 28 is installed below the front of the rear hanger 24, and the bottom of the support plate 28 is fixedly connected to the connecting beam 18-3 (using bolts). The rear sides of the rear hanger 24 are fixedly connected to the left and right rear fork plates 18-5 respectively by two left and right support rods 27. Specifically, the upper end of the support rod 27 is hinged to the rear of the rear hanger 24, and the lower end of the support rod 27 is fixedly connected to the rear fork plate 18-5 using bolts. A brake assembly 22 acting on the rear wheel 19 can also be installed on the connecting beam 18-3.

[0036] In this embodiment, a bushing is fixedly installed at the rear of the rear rack 24, and two axles are inserted into both ends of the bushing. Two rear rollers 25 are respectively fixed to the outer ends of the two axles. The distance between the two rear rollers 25 is adjusted by extending and retracting the axles within the bushing. The advantage of this structure is that when the electric-assisted bicycle is in motion... Figure 6 When the rear rollers are in the deeply folded state as shown, the overall stability is insufficient when pushing or moving. In this case, the axle of the rear roller 25 can be pulled outward from its bushing, increasing the distance between the two rear rollers 25, which helps improve the smoothness of movement when in the deeply folded state. When riding, the axle of the rear rollers 25 should be fully retracted to avoid carrying people or goods on the rear rack 24.

[0037] A saddle tube 14 is inserted into the seat tube 17. A locking member 13-1 also serves as an adjusting fastener for the saddle tube 14. A battery assembly 20 is installed inside the saddle tube 14, and a seat assembly 23 is mounted on top of the battery assembly 20. To adjust the height of the seat assembly 23, the locking member 13-1 must be unlocked, allowing the saddle tube 14 to be adjusted in height. Once the seat assembly 23 is at the desired height, the locking member 13-1 can be locked again. The battery assembly 20 includes a housing, battery cells, and a control circuit board. The housing has terminals and a charging interface. The saddle tube 14 has terminals inside. When the battery assembly 20 is inserted into the saddle tube 14, it connects to the terminals inside the tube, thus providing power. The seat assembly 23 includes a mounting base and a seat body. The mounting base is fixedly connected to the upper end of the battery assembly 20's housing, and the seat body is mounted on the mounting base.

[0038] Please see Figure 4 and Figure 5 The specific structure of the third folder 13 can be seen:

[0039] The locking component 13-1 includes a clamp sleeved on the seat post 17. Bases are located on both sides of the clamp's opening, and a connecting shaft is positioned between the bases. An adjusting arm is hinged to one end of the connecting shaft to tighten and release the bases, thus operating the clamp's tightening and releasing. As shown in the figure, after the height of the seat assembly 23 is adjusted, the adjusting arm is moved forward and placed against the side of the clamp. The two bases tighten, and the upper end of the seat post 17 clamps and fixes the saddle post 14, thus determining the height of the saddle post 14 and the seat assembly 23. When height adjustment is needed, the adjusting arm is moved backward. The clamping force applied to the two bases disappears, the clamp loosens from the upper end of the seat post 17, and the saddle post 14 is released, allowing for height adjustment.

[0040] A toothed clamping plate is provided in the middle of the connecting shaft, and a wrench is provided at the bottom of the clamping plate. When the wrench is pressed down, the clamping plate with the toothed clamping plate tilts downward.

[0041] The coupling 13-2 includes a base plate fixed to the frame 18. Specifically, the base plate of the coupling 13-2 is mounted between the upper ends of the two front upright forks 18-1 (welded fixed). A forward-extending coupling rod is mounted on the base plate. A coupling end with a groove at the bottom is provided at the front end of the coupling rod. A push plate is provided behind the coupling end. A spring is provided between the push plate and the base plate, and the spring provides a forward elastic force.

[0042] like Figure 3 As shown, when the connecting member 13-2 is engaged with the locking member 13-1, the connecting end of the front part of the connecting member 13-2 presses against the locking plate of the locking member 13-1, causing the locking teeth to engage with the locking groove of the connecting end. At the same time, the pushing plate abuts against the rear edge of the locking plate, and the spring provides a forward elastic force. Therefore, the locking plate and the wrench will not tilt downward spontaneously, thus maintaining a stable engagement state. When it is necessary to disengage the connection between the connecting member 13-2 and the locking member 13-1, the wrench needs to be pressed down. The locking plate pushes the pushing plate backward and causes the spring to contract. When a certain position is reached, the locking teeth on the locking plate separate from the locking groove on the connecting end, and the connecting member 13-2 and the locking member 13-1 can be separated.

[0043] How to use:

[0044] Figure 1 The image shows the riding state. Figure 6 The bike is in a deeply folded state. The procedure for transitioning from the riding state to the deeply folded state is as follows: Release the locking mechanism of the first folding device 4, fold the stem 8 and its accessories to the side and downwards, finally transferring the stem 8 and its accessories to the side of the front wheel 1, engaging the latch 7 with the latch seat 2; then release the locking mechanisms of the second folding device 9 and the third folding device 13, flipping the front wheel 1 backwards horizontally, and flipping the frame 18 and rear wheel 19 forwards. Figure 1(as shown in the clockwise direction), eventually transforming into Figure 6 In the state shown, the front roller 21 and the rear roller 25 are on the ground, and the user holds the seat assembly 23 to push and move the electric-assist bicycle, which is in a folded state.

Claims

1. A three-fold electric-assist bicycle, comprising a fork tube (5), a seat post (17), a mid-mounted motor (16), and a frame (18), wherein a fork assembly is installed inside the fork tube (5), a main beam is installed between the fork tube (5) and the seat post (17), and the lower end of the seat post (17) is fixedly connected to the mid-mounted motor (16); characterized in that: A first folding device (4) is provided on the stem (8) of the fork assembly. The main beam is divided into a front section (6) and a rear section (10) and a second folding device (9) is provided between the two. The bottom front part of the frame (18) is hinged to the rear part of the mid-mounted motor (16). A third folding device (13) is provided between the top front part of the frame (18) and the upper part of the seat post (17). The third folding device (13) consists of a locking element (13-1) and a connecting element (13-2) that can be engaged and disengaged. The frame is constructed such that the locking element (13-1) is located on the seat tube (17), and the connecting element (13-2) is located on the frame (18); a rear rack (24) is also installed on the top of the frame (18), a front roller (21) is installed at the front of the frame (18), and a rear roller (25) is installed at the rear of the rear rack (24). When the third folding device (13) is in the disengaged state, the frame (18) can be flipped forward, and the front roller (21) and the rear roller (25) are transferred to the bottom to form the driving wheels.

2. The three-fold electric-assist bicycle as described in claim 1, characterized in that: A diagonal brace beam (11) is installed between the middle of the rear section (10) of the main beam and the front of the central motor (16). The vehicle controller (12) is installed in the space between the rear section (10), the diagonal brace beam (11), and the central motor (16).

3. The three-fold electric-assist bicycle as described in claim 2, characterized in that: A saddle tube (14) is inserted into the seat tube (17), and a locking member (13-1) serves as an adjusting fastener for the saddle tube (14). A battery assembly (20) is installed inside the saddle tube (14), and a seat assembly (23) is installed on top of the battery assembly (20).

4. The three-fold electric-assist bicycle as described in claim 3, characterized in that: The locking component (13-1) includes a clamp sleeved on the seat tube (17), a base is provided on both sides of the opening of the clamp and a connecting shaft is provided between the bases, an adjusting arm is hinged to one end of the connecting shaft to tighten and release the base to operate the clamp to tighten and release, a locking plate with locking teeth is provided in the middle of the connecting shaft, and a wrench is provided at the bottom of the locking plate; the connecting component (13-2) includes a base plate fixed to the frame (18), a connecting rod extending forward is installed on the base plate, a connecting end with a locking groove at the front end of the connecting rod is provided, a pushing plate is provided behind the connecting end, and a spring is provided between the pushing plate and the base plate.

5. The three-fold electric-assist bicycle as described in claim 4, characterized in that: The frame (18) includes two sets of horizontal forks (18-4) on the left and right and a rear vertical fork (18-2). A rear fork piece (18-5) is provided between the rear ends of the horizontal fork (18-4) and the rear vertical fork (18-2). A front vertical fork (18-1) is installed at the front end of the horizontal fork (18-4). The upper end of the front vertical fork (18-1) is fixedly connected to the upper end of the rear vertical fork (18-2), and the upper end of the front vertical fork (18-1) is bent outward to form the wheel support of the front roller (21). The base plate of the connector (13-2) is installed between the upper ends of the two front vertical forks (18-1).

6. The three-fold electric-assist bicycle as described in claim 5, characterized in that: A connecting beam (18-3) is installed between the middle of the two rear upright forks (18-2). A support plate (28) is installed below the front of the rear hanger (24), and the bottom of the support plate (28) is fixedly connected to the connecting beam (18-3). The rear sides of the rear hanger (24) are fixedly connected to the left and right rear fork pieces (18-5) respectively by two left and right support rods (27).

7. The three-fold electric-assist bicycle as described in claim 6, characterized in that: A bushing is installed and fixed at the rear of the back hanger (24), and two axles are inserted and installed at both ends of the bushing. Two rear rollers (25) are respectively installed and fixed at the outer ends of the two axles. The distance between the two rear rollers (25) is adjusted by extending and retracting the axles inside the bushing.

8. The three-fold electric-assist bicycle as described in claim 7, characterized in that: A chain (15) and a foot pedal assembly are mounted on the output shaft of the mid-mounted motor (16).

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