Electric bicycle

Abstract

The invention provides an electric bicycle. The electric bicycle comprises a frame, a driving system, a walking assembly, a transmission assembly and a suspension assembly. The walking assembly comprises rear walking wheels, and the rear walking wheels are in transmission connection with the driving system. The transmission assembly is arranged between the driving system and the walking assembly so as to transmit driving force. The walking assembly is connected with the frame through the suspension assembly. The suspension assembly comprises a rear bottom fork, one end of the rear bottom fork is rotationally connected with the rear walking wheel, and the other end of the rear bottom fork is rotationally connected with the frame. The driving system comprises a pedal assembly and a motor assembly, at least part of the pedal assembly is arranged on the rear bottom fork and rotationally connected to the rear bottom fork, the rear walking wheel is connected with the pedal assembly and the motor assembly through a transmission assembly, and the pedal assembly and the motor assembly can drive the rear walking wheel to rotate. According to the electric bicycle, the frame can have a larger installation space, the structure of the frame is simplified, the weight of the frame is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of bicycles, and in particular to an electric bicycle. Background Art

[0002] Currently, in electric bicycles, electric drive is usually achieved through a hub motor, which is arranged together with the wheel. Due to the hub motor, the pedal part of the bicycle is usually arranged on the frame, and the rear fork of the bicycle only needs to be designed based on the hub motor. However, the structural design adapted to the hub motor bicycle cannot be applied to electric bicycles that do not use hub motors. For example, in an electric bicycle using a mid-mounted motor, the mid-mounted motor as an electric drive also needs to be installed on the frame. If the traditional electric bicycle structure is used, the pedal part and the mid-mounted motor will be arranged on the frame, which will lead to problems such as insufficient installation space for the frame, increased weight due to complex structure, and increased cost. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the present application provides an electric bicycle with a compact structure.

[0004] In one embodiment of the present application, an electric bicycle is provided, comprising a frame; a drive system; a traveling assembly, the traveling assembly comprising a rear traveling wheel, the rear traveling wheel being transmission-connected to the drive system; a transmission assembly, the transmission assembly being at least partially arranged between the drive system and the traveling assembly to transmit driving force; a suspension assembly, the suspension assembly connecting the frame and the traveling assembly; the suspension assembly comprising a rear fork, the rear traveling wheel being connected to the frame via the rear fork; the rear fork comprising an assembly portion and a connecting portion, the assembly portion being fixedly connected to the connecting portion, the assembly portion being rotationally connected to the frame, and the connecting portion being connected to the rear traveling rotating wheel; the drive assembly comprising a pedal assembly, the pedal assembly being at least partially arranged on the assembly portion and at least partially rotationally connected to the assembly portion, the transmission assembly comprising a first transmission member, the rear traveling wheel and the pedal assembly being transmission-connected via the first transmission member.

[0005] In the electric bicycle provided by the present application, the pedal assembly is rotatably connected to the rear fork instead of the frame, so that the pedal assembly does not occupy the installation space of the frame, avoiding the problem of complicating the frame by installing the pedal assembly on the frame, thereby simplifying the structure of the frame, and further reducing the weight of the frame and reducing the production cost. The pedal assembly is installed on the rear fork and the pedal assembly and the rear fork can be made into one piece, thereby reducing the cumbersome steps of large-scale production line assembly and improving production efficiency.

[0006] In some embodiments, the pedal assembly includes a middle shaft and a sprocket, the middle shaft at least partially passes through the rear fork and is rotatably connected to the rear fork, and the sprocket is arranged on the middle shaft and is fixedly connected to the middle shaft.

[0007] In some embodiments, a longitudinal plane perpendicular to the axis of the rotation axis of the rear running wheel is defined, and the connecting portion is arranged to be substantially bilaterally symmetrical with respect to the longitudinal plane.

[0008] In some embodiments, the driving assembly further includes a motor assembly, the transmission assembly further includes a second transmission member, and the motor assembly and the rear travel are arranged in transmission connection via the second transmission member.

[0009] In some embodiments, a longitudinal plane perpendicular to the axis of the rotation axis of the rear walking wheel is defined, the assembly portion includes a first assembly part and a second assembly part distributed along the left and right sides, the distance between the first assembly part and the longitudinal plane is defined as a first distance, the distance between the second assembly part and the longitudinal plane is defined as a second distance, and the first distance is set to be smaller than the second distance.

[0010] In some embodiments, the pedal assembly further includes a sprocket, the assembly portion includes a first assembly part and a second assembly part distributed left and right, a receiving space is formed on a side of the first assembly part away from the second assembly part, and the sprocket is at least partially disposed in the receiving space.

[0011] In some embodiments, the rear fork further includes a sleeve, the sleeve being at least partially disposed between the pedal assembly and the mounting portion.

[0012] In some embodiments, the sleeve includes an outer tube and an inner tube, the outer tube and the inner tube are configured to be fixedly connected, the inner diameter of the outer tube is larger than the inner diameter of the inner tube, and a bowl set is also arranged between the pedal assembly and the outer tube.

[0013] In some embodiments, a longitudinal plane perpendicular to the axis of the rotation axis of the rear traveling wheel is defined, the plane where the sprocket is extended is defined as the sprocket plane, and the distance between the sprocket plane and the longitudinal plane is substantially consistent with the length of the second distance.

[0014] In some embodiments, the connecting portion includes a first connecting segment, a second connecting segment and a third connecting segment, the second connecting segment and the third connecting segment are respectively connected to both ends of the first connecting segment, the first connecting segment is fixedly connected to the assembly portion, and the second connecting segment and the third connecting segment are rotatably connected to the rear walking wheel; the distance between the second connecting segment and the third connecting segment is limited to a third distance, and the sum of the first distance and the second distance is less than the third distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of an electric bicycle in one embodiment of the present application.

[0016] Figure 2 for Figure 1 A perspective view of the middle section of an electric bicycle.

[0017] Figure 3 for Figure 2 A three-dimensional view of the center and rear fork.

[0018] Figure 4 for Figure 3 Top view of the center rear fork.

[0019] Figure 5 for Figure 3 Exploded view of the center and rear fork.

[0020] Figure 6 It is a cross-sectional view of a sleeve in one embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical solution of the present application will be described below in conjunction with the drawings in the implementation modes of the present application. Obviously, the described implementation modes are only part of the implementation modes of the present application, rather than all the implementation modes.

[0022] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0024] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0025] See also Figure 1 and Figure 2In one embodiment of the present application, an electric bicycle 100 is provided, comprising a frame 11, a drive system 12, a travel assembly 13, a transmission assembly 14 and a suspension assembly 15. The frame 11 is used to form the overall structure of the electric bicycle 100. The suspension assembly 15 is rotatably connected to the frame 11. The travel assembly 13 includes a rear travel wheel 131, and the rear travel wheel 131 is rotatably connected to the suspension assembly 15. The transmission assembly 14 is connected between the drive system 12 and the rear travel wheel 131, the drive system 12 is used to provide power, and the transmission assembly 14 is used to transmit the power of the drive system 12 to the rear travel wheel 131, that is, the drive system 12 drives the rear travel wheel 131 through the transmission assembly 14, so that the rear travel wheel 131 rotates to drive the electric bicycle 100 to move, thereby realizing the travel of the electric bicycle 100.

[0026] In some embodiments, the suspension assembly 15 includes a rear fork 151. One end of the rear fork 151 is rotatably connected to the frame 11, and the rear running wheel 131 is rotatably connected to the end of the rear fork 151 away from the frame 11. The rear fork 151 and the frame 11 are connected through an elastic component with a buffering function, so that the rear fork 151 can play a role in suspending the rear running wheel 131, thereby maintaining the stability of the frame 11. It can be understood that the rear fork 151 can also be called a rocker arm.

[0027] In some embodiments, the drive system 12 includes a motor assembly 122, and the transmission assembly 14 includes a first transmission member 141 and a second transmission member 142. The second transmission member 142 is connected between the motor assembly 122 and the rear travel wheel 131, and is used to transmit the electric driving force generated by the motor assembly 122 to the rear travel wheel 131, that is, the motor assembly 122 drives the rear travel wheel 131 through the second transmission member 142. As an optional embodiment, the motor assembly 122 is at least partially on the frame 11 and supported by the frame 11. In the present application, the motor assembly 122 is at least partially arranged in front of the suspension assembly 15. As an illustrative example, the second transmission member 142 is a chain or a belt, etc.

[0028] In some embodiments, the drive system 12 further includes a pedal assembly 121, and a first transmission member 141 is connected between the pedal assembly 121 and the rear travel wheel 131, and is used to transmit the power generated by the pedal assembly 121 to the rear travel wheel 131, so that the driver can drive the rear travel wheel 131 to rotate by stepping on the pedal assembly 121. As an optional embodiment, the pedal assembly 121 is at least partially penetrated by the rear fork 151 and is rotatably connected to the rear fork 151. As an exemplary example, the first transmission member 141 is a chain or a belt.

[0029] In some embodiments, the second transmission member 142 and the first transmission member 141 are respectively located on the left and right sides of the electric bicycle 100 to avoid interference between the second transmission member 142 and the first transmission member 141 .

[0030] See also Figures 3 to 5 In some embodiments, the rear fork 151 includes a connecting portion 152 and an assembly portion 153 connected to each other. One end of the assembly portion 153 away from the connecting portion 152 is rotatably connected to the frame 11, and one end of the connecting portion 152 away from the assembly portion 153 is rotatably connected to the rear running wheel 131. The pedal assembly 121 includes a central axis 1212, and the central axis 1212 is configured to at least partially penetrate the assembly portion 153 and is rotatably connected to the assembly portion 153. The assembly portion 153 includes a first assembly part 1531 and a second assembly part 1532. The pedal assembly 121 also includes a sprocket 1211, and the sprocket 1211 is at least partially disposed on the central axis 1212 and fixedly connected to the central axis 1212. Further, the sprocket 1211 is connected to the rear running wheel 131 through the first transmission member 141, which is used to transmit the driving force of the pedal assembly 121 to the rear running wheel 131. As an illustrative example, the transmission assembly 14 is a chain, the sprocket 1211 is used as a driving wheel, the rear travel wheel 131 is provided with a coaxial driven sprocket, and the chain is arranged around the sprocket 1211 and the driven sprocket to achieve transmission between the sprocket 1211 and the rear travel wheel 131. This arrangement can reduce the installation space occupied by the pedal assembly 121 on the frame 11, so that the frame 11 can have enough space to install the motor assembly 122, and also avoid the traditional complex structure in which the pedal assembly 121 and the motor assembly 122 are both arranged on the frame 11, thereby simplifying the structure of the frame 11, thereby reducing the weight of the frame 11 and reducing the production cost.

[0031] A longitudinal plane A perpendicular to the rotation axis of the rear running wheel 131 is defined, and the electric bicycle is substantially bilaterally symmetrical with respect to the longitudinal plane A. The length directions of the first assembly part 1531 and the second assembly part 1532 are substantially parallel to the longitudinal plane A. The connecting portion 152 is configured to be substantially symmetrical with respect to the longitudinal plane A, the first assembly part 1531 and the second assembly part 1532 are respectively located on both sides of the longitudinal plane A, the distance between the first assembly part 1531 and the longitudinal plane A is defined as a first distance H1, the distance between the second assembly part 1532 and the longitudinal plane A is defined as a second distance H2, and the first distance H1 is not equal to the second distance H2.

[0032] For example, see Figure 4As an optional implementation, the first distance H1 is set to be smaller than the second distance H2, and the side of the first assembly 1531 facing away from the second assembly 1532 can form a receiving space 1533, and the sprocket 1211 is at least partially disposed in the receiving space 1533; as an optional implementation, the ratio between the first distance H1 and the second distance H2 is set to be greater than or equal to 1.4 and less than or equal to 2.5. In the present application, the ratio between the first distance H1 and the second distance H2 is set to 2.35. The present application can provide sufficient space to place the sprocket 1211 through the distance characteristics between the first assembly 1531 and the second assembly 1532 and the longitudinal plane A, so that the sprocket 1211 is close enough to the longitudinal plane A, thereby adapting to the mid-mounted motor. Moreover, for sprockets 1211 of different sizes, it is only necessary to change the length of the first assembly part 1531 and the second assembly part 1532, or change the distance of the first assembly part 1531 or the second assembly part 1532 relative to the longitudinal plane A, so as to expand or reduce the accommodation space 1533, thereby facilitating the installation of sprockets 1211 of different sizes. It can be understood that the first assembly part 1531 can be arranged on the left side of the electric bicycle 100, and the second assembly part 1532 can be arranged on the right side of the electric bicycle 100, or the first assembly part 1531 can be arranged on the right side of the electric bicycle 100, and the second assembly part 1532 can be arranged on the left side of the electric bicycle 100; and the accommodation space 1533 can be arranged on the left side of the electric bicycle 100 or on the right side of the electric bicycle 100.

[0033] In some embodiments, the extended surface where the sprocket 1211 is located is defined as the sprocket plane B, and the distance L between the sprocket plane B and the longitudinal plane A is set to be substantially consistent with the first distance H1, so that the overall structure of the rear fork 151 and the pedal assembly 121 is more symmetrical, so as to evenly distribute the weight and facilitate installation. As an optional embodiment, the ratio between the distance L between the sprocket plane B and the longitudinal plane A and the first distance H1 is set to be greater than or equal to 0.81 and less than or equal to 1.06. In the present application, the ratio between the distance L between the sprocket plane B and the longitudinal plane A and the first distance H1 is set to 0.94.

[0034] In some embodiments, the connecting portion 152 includes a first connecting segment 1521, a second connecting segment 1522, and a third connecting segment 1523. The first connecting segment 1521 and the second connecting segment 1522 are respectively located on both sides of the longitudinal plane A. The two ends of the third connecting segment 1523 are respectively connected to one end of the first connecting segment 1521 and the second connecting segment 1522 close to the assembly portion 153. The rear running wheel 131 is located between the first connecting segment 1521 and the second connecting segment 1522, and the rear running wheel 131 is rotatably connected to one end of the first connecting segment 1521 and the second connecting segment 1522 away from the assembly portion 153. The first assembly part 1531 and the second assembly part 1532 are connected to the third connecting segment 1523.

[0035] In some embodiments, the length directions of the first connecting segment 1521 and the second connecting segment 1522 are parallel to the longitudinal plane A. The distance between the first connecting segment 1521 and the second connecting segment 1522 is defined as a third distance H3, the sum of the first distance H1 and the second distance H2 is smaller than the third distance H3, and the sum of the first distance H1 and the distance L between the sprocket 1211 and the longitudinal plane A is also smaller than the third distance H3, so that the rear fork 151 can form an accommodating space 1533 to accommodate the sprocket 1211.

[0036] In some embodiments, the third connecting segment 1523 is "U"-shaped. Since the total length of the connecting portion 152 needs to fit the radial dimension of the rear walking wheel 131, under the condition that the total length of the connecting portion 152 remains unchanged, compared with the crossbeam in the rear fork of the traditional "H"-shaped structure, the curved third connecting segment 1523 can play a role of avoiding position, that is, under the condition that the length of the first assembly 1531 or the second assembly 1532 remains unchanged, the curved third connecting segment 1523 can make the size of the accommodating space 1533 larger, that is, under the condition that the required size of the accommodating space 1533 remains unchanged, the curved third connecting segment 1523 can shorten the length of the first assembly 1531 or the second assembly 1532, thereby making the structure of the rear fork 151 more compact.

[0037] See also Figure 5 and Figure 6In some embodiments, the first assembly part 1531 and the second assembly part 1532 are both provided with aligned through holes 1534. The rear fork 151 includes two sleeves 1511, one sleeve 1511 is disposed in each through hole 1534, a portion of the sleeve 1511 is located in the through hole 1534, and the other portion is located outside the through hole 1534. The pedal assembly 121 includes a central shaft 1212, the central shaft 1212 passes through the two sleeves 1511 and can rotate relative to the sleeve 1511 around the axis of the central shaft 1212. The sprocket 1211 is coaxially disposed on the central shaft 1212 and rotates with the central shaft 1212. The sleeve 1511 is used to extend the length of the through hole 1534 to limit the central shaft 1212 along the axis, so as to improve the stability of the central shaft 1212 relative to the first assembly part 1531 and the second assembly part 1532.

[0038] In some embodiments, the sleeve 1511 includes an inner tube 1511a and an outer tube 1511b connected in the axial direction, the inner tube 1511a is arranged in the through hole 1534, and the outer diameter of the outer tube 1511b is larger than the diameter of the through hole 1534, that is, the outer tube 1511b is located outside the through hole 1534, and the outer tube 1511b is located on the opposite side of the first assembly part 1531 and the second assembly part 1532. The middle shaft 1212 passes through the inner tube 1511a and the outer tube 1511b. The pedal assembly 121 also includes a bowl set 1213. The inner diameter of the outer tube 1511b is larger than the inner diameter of the inner tube 1511a, so that the outer tube 1511b has a space on the peripheral side of the middle shaft 1212 to install the bowl set 1213, and the bowl set 1213 is used to reduce the friction between the middle shaft 1212 and the sleeve 1511. As an illustrative example, the inner wall of the outer tube 1511b is provided with an English threaded hole for matching the thread of the bowl set 1213, and a dustproof rubber ring is provided between the middle shaft 1212 and the inner wall of the inner tube 1511a to prevent water or dust from entering the bowl set 1213.

[0039] See also Figures 3 to 5 In some embodiments, the pedal assembly 121 also includes a pedal 1214 and a crank 1215. A crank 1215 is connected to each end of the central axis 1212. The end of each crank 1215 away from the central axis 1212 is connected to a pedal 1214. The pedal 1214 is used for the driver to step on. The pedal 1214 drives the crank 1215 to drive the central axis 1212 to rotate, thereby driving the rear walking wheel 131 to rotate through the sprocket 1211 and the transmission assembly 14.

[0040] In some embodiments, the rear fork 151 further includes an axle tube 1512, the axis of which is perpendicular to the longitudinal plane A, and the ends of the first assembly part 1531 and the second assembly part 1532 away from the connecting portion 152 are connected to the axle tube 1512. The axle tube 1512 is rotatably connected to the frame 11, so that the rear fork 151 can rotate relative to the frame 11 around the axis of the axle tube 1512, thereby playing a buffering role.

[0041] In some embodiments, the rear fork 151 further includes a plurality of reinforcing plates 1513. Some of the reinforcing plates 1513 are disposed between the first assembly part 1531 and the second assembly part 1532 and connect the first assembly part 1531, the second assembly part 1532 and the third connecting section 1523. Some of the reinforcing plates 1513 are also disposed on the side of the first assembly part 1531 facing away from the second assembly part 1532 and connect the third connecting section 1523 and the first assembly part 1531. Some of the reinforcing plates 1513 are also disposed on the side of the second assembly part 1532 facing away from the first assembly part 1531 and connect the third connecting section 1523 and the second assembly part 1532. The reinforcing plates 1513 are used to strengthen the structural strength between the connecting portion 152 and the assembly portion 153.

[0042] In some embodiments, the first assembly part 1531, the second assembly part 1532 and the connecting part 152 are all hollow square tubes with rectangular cross-sections, such as Figure 6 As shown, the weight is reduced. The first assembly part 1531 and the second assembly part 1532 are welded to the third connection section 1523 and the shaft tube 1512. The sleeve 1511 is welded to the first assembly part 1531 and the second assembly part 1532. After the sleeve 1511 is welded to the first assembly part 1531 and the second assembly part 1532, the first assembly part 1531 and the second assembly part 1532 are welded to the third connection section 1523 and the shaft tube 1512, so that the error of the structure after welding is small, and the pedal assembly 121 is conveniently installed in advance, reducing the difficulty of installation and reducing the tedious operations on the fast and busy assembly line.

[0043] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. An electric bicycle, comprising: Frame; Drive system; A traveling assembly, the traveling assembly comprising a rear traveling wheel, the rear traveling wheel being drivingly connected to the driving system; A transmission assembly, wherein the transmission assembly is at least partially disposed between the drive system and the travel assembly to transmit a driving force; A suspension assembly, the suspension assembly connecting the frame and the travel assembly; It is characterized in that the suspension assembly includes a rear fork, and the rear walking wheel is connected to the frame through the rear fork; the rear fork includes an assembly part and a connecting part, the assembly part is fixedly connected to the connecting part, the assembly part is rotatably connected to the frame, and the connecting part is rotatably connected to the rear walking wheel; the driving assembly includes a pedal assembly, the pedal assembly is at least partially arranged on the assembly part and is at least partially rotatably connected to the assembly part, the transmission assembly includes a first transmission member, and the rear walking wheel and the pedal assembly are transmission connected through the first transmission member.

2. The electric bicycle according to claim 1, characterized in that: The pedal assembly includes a central shaft and a sprocket. The central shaft at least partially passes through the assembly portion and is rotatably connected to the assembly portion. The sprocket is arranged on the central shaft and is fixedly connected to the central shaft.

3. The electric bicycle according to claim 1, characterized in that: A plane perpendicular to the axis of the rotation axis of the rear running wheel is defined as a longitudinal plane, and the connecting portion is arranged to be substantially bilaterally symmetrical with respect to the longitudinal plane.

4. The electric bicycle according to claim 1, characterized in that: The driving assembly further includes a motor assembly, and the transmission assembly further includes a second transmission member, and the motor assembly and the rear walking wheel are transmission-connected via the second transmission member.

5. The electric bicycle according to claim 2, characterized in that: A plane perpendicular to the axis of the rotation axis of the rear walking wheel is defined as a longitudinal plane, the assembly portion includes a first assembly part and a second assembly part distributed along the left and right sides, the distance between the first assembly part and the longitudinal plane is defined as a first distance, and the distance between the second assembly part and the longitudinal plane is defined as a second distance, and the first distance is set to be smaller than the second distance.

6. The electric bicycle according to claim 1, characterized in that: The pedal assembly also includes a sprocket, the assembly portion includes a first assembly part and a second assembly part distributed along the left and right sides, a receiving space is formed on a side of the first assembly part away from the second assembly part, and the sprocket is at least partially arranged in the receiving space.

7. The electric bicycle according to claim 1, characterized in that: The rear fork further includes a sleeve, which is at least partially disposed between the footrest assembly and the mounting portion.

8. The electric bicycle according to claim 7, characterized in that: The sleeve comprises an outer tube and an inner tube, the outer tube and the inner tube are arranged to be fixedly connected, the inner diameter of the outer tube is larger than the inner diameter of the inner tube, and a bowl assembly is further arranged between the pedal assembly and the outer tube.

9. The electric bicycle according to claim 5, characterized in that: A plane in which the sprocket is extended is defined as a sprocket plane, and a distance between the sprocket plane and the longitudinal plane is substantially consistent with a length of the second distance.

10. The electric bicycle according to claim 5, characterized in that: The connecting portion includes a first connecting segment, a second connecting segment and a third connecting segment, the second connecting segment and the third connecting segment are respectively connected to two ends of the first connecting segment, the first connecting segment is fixedly connected to the assembly portion, and the second connecting segment and the third connecting segment are rotatably connected to the rear walking wheel; the distance between the second connecting segment and the third connecting segment is limited to a third distance, and the sum of the first distance and the second distance is less than the third distance.

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