Electric bicycle with a rear suspension system

Abstract

An electric bicycle with a rear damping system comprising a rear damping system, a front wheel (4) and a rear wheel (5), wherein the rear damping system comprises a frame (1), a rear fork damper (9) and a rear fork (2) for installing the rear wheel (5), wherein the rear fork (2) comprises an upper rear fork tube (201) and a lower rear fork tube (202), characterized in that the lower rear fork tube (202) is pivotally connected to the frame (1) at a first pivot point (M), wherein one end of the rear fork damper (9) is pivotally connected to the upper rear fork tube (201) at a second pivot point (N), while another end is pivotally connected to the frame (1) at a third pivot point (P), and wherein a line direction between the first pivot point (M) and the second pivot point (N) is perpendicular to a telescopic direction of the rear fork damper (9) runs.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the field of electric bicycles, in particular to an electric bicycle with a rear suspension system. STATE OF THE ART

[0002] An electric bicycle is a vehicle that uses a battery as its power source and converts electrical energy into mechanical energy through a controller, motor, and other components to move.

[0003] Electric bikes are lighter than motorcycles, but this can lead to poor shock absorption. The electric bike vibrates heavily, especially when riding on uneven roads.

[0004] The technical problem of how to develop an electric bicycle with easy installation and good damping performance must therefore be solved by the local technicians. CONTENT OF THE PRESENT UTILITY MODEL

[0005] The purpose of the present utility model is to provide a rear suspension system and an electric bicycle with a rear suspension system.

[0006] In order to solve the above technical problems, the present utility model further provides an electric bicycle with a rear suspension system.

[0007] An electric bicycle with a rear damping system comprising a rear damping system, a front wheel, and a rear wheel, the rear damping system comprising a frame, a rear fork damper, and a rear fork for installing the rear wheel, the rear fork comprising an upper fork tube and a lower fork tube, the lower fork tube being pivotally connected to the frame at a first pivot point, one end of the rear fork damper being pivotally connected to the upper fork tube at a second pivot point, while another end is pivotally connected to the frame at a third pivot point, and a line direction between the first pivot point and the second pivot point is perpendicular to a telescopic direction of the rear fork damper.

[0008] The present utility model has the following advantageous effects: During the riding of the electric bicycle, the vibration of the rear part of the bicycle body perceived by the rider is mainly caused by the up and down vibration caused by the unevenness between the rear wheel and the road surface. The rear wheel is installed on the rear fork, that is, the rear fork generates vibration synchronously with the rear wheel. The above rear fork is also pivotally connected to the frame via the rear fork lower tube at the first pivot point, so that when the rear fork swings up and down, the actual vibration path is a circular arc with the first pivot point as the center.The above rear fork is also pivotally connected to a second pivot point through the rear fork upper tube and one end of the rear fork damper. The line direction between the first pivot point and the second pivot point is perpendicular to the telescopic direction of the rear fork damper. That is, the telescopic direction of the rear fork damper is in the tangent direction of the circular arc centered on the first pivot point, and the telescopic direction is in the same direction as the vibration direction of the rear fork. Therefore, the expansion and contraction of the rear fork damper effectively counteracts the vibration of the rear fork, thereby significantly improving the damping effect. SHORT DESCRIPTION OF THE DRAWING Fig. 1-1 is a schematic diagram showing the structure of a specific embodiment of a rear suspension system for an electric bicycle according to a specific embodiment of the present invention; Fig. 1-2 shows a schematic diagram of the arrangement principle of the rear fork damper of the rear damping system for an electric bicycle of the present utility model; Fig. Figure 2 shows a partially enlarged view of part A in Fig. 1-1; Fig. 3 is a partially enlarged view of a first pivot point in the rear suspension system for an electric bicycle of the present utility model; Fig. 4 shows a partially enlarged view of part B in Fig. 1-1. DETAILED DESCRIPTION

[0009] In order to enable the person skilled in the art to better understand the technical solution of the present utility model, a detailed description of the present utility model follows in conjunction with the attached drawings and concrete embodiments.

[0010] As in Fig. 1-1 and 1-2, the present utility model provides a rear damping system for an electric bicycle, including a frame 1, a rear fork damper 9, and a rear fork 2 for mounting a rear wheel 5 of the electric bicycle. The rear fork 2 includes a rear fork upper tube 201 and a rear fork lower tube 202. The rear fork lower tube 202 is pivotally connected to the frame 1 at a first pivot point M. The frame 1 typically has a substantially triangular shape, and the first pivot point M is located at a rear lower corner of the triangular frame 1. The two ends of the rear fork damper 9 are pivotally connected to the rear fork upper tube 201 and to the frame 1 at a second pivot point N, respectively, and the line direction between the first pivot point M and the second pivot point N is perpendicular to the telescopic direction of the rear fork damper 9.

[0011] During the riding of the electric bicycle, the vibration of the rear part of the bicycle body perceived by the rider is mainly caused by the up and down vibration caused by the unevenness between the rear wheel 5 and the road surface. The rear wheel 5 is installed on the rear fork 2, that is, the rear fork 2 generates vibrations synchronously with the rear wheel 5. The above rear fork 2 is also pivotally connected to the frame 1 via the lower rear fork tube 202 at the first pivot point M, so that when the rear fork 2 swings up and down, the actual vibration path is a circular arc with the first pivot point M as the center (as in Fig. 1 to 2). The above rear fork 2 is also pivotally connected to a second pivot point N by the rear fork upper tube 201 and one end of the rear fork damper 9, and the line direction between the first pivot point M and the second pivot point N is perpendicular to the telescopic direction of the rear fork damper 9, that is, the telescopic direction of the rear fork damper 9 is in the tangent direction of the circular arc (in the direction of the arrow in Fig. 1-2) centered on the first pivot point M, and the telescopic direction is substantially in the same direction as the vibration direction of the rear fork 2. Therefore, the expansion and contraction of the rear fork damper 9 effectively counteracts the vibration of the rear fork 2, thereby significantly improving the damping effect.

[0012] In addition, the two ends of the above rear fork damper 9 are respectively pivotally connected to the rear fork upper tube 201 and the frame 1, that is, only two pivot structures need to be used to realize its installation and fixing, which is a simple structure, so that the installation efficiency of the electronic bicycle is significantly improved.

[0013] It should be noted that, according to the above principle, the telescopic direction of the rear fork damper 9 should be along the trajectory of the oscillation of the rear wheel 5 in order to dampen the vibrations as efficiently as possible, and the rear fork damper 9 is not subjected to forces in other directions at this time. Therefore, the line direction between the first pivot point M and the second pivot point N is perpendicular to the telescopic direction of the rear fork damper 9. The "perpendicular" mentioned here does not necessarily have to be 90 degrees, but is approximately perpendicular. As long as the direction is approximately perpendicular, it is feasible both from the perspective of realizing efficient damping and from the perspective of installation deviation.It is understandable that when the rear wheel 5 impacts and the rear fork damper 9 telescopes to dampen the vibrations and change the telescopic length of the rear fork damper 9, the angle between the line direction between the first pivot point M and the second pivot point N and the direction of the telescopic direction of the rear fork damper 9 itself may have a certain angular deviation from the pure 90-degree perpendicular.

[0014] With a view to Fig. 1-1, the frame 1 may be a substantially triangular structure formed by the combination of the upper frame tube 101, the middle frame post 102 and the lower frame tube 103 (in Fig. 1-1, the upper frame tube 101 and the lower frame tube 103 are actually connected at the front to form a post with a certain length to facilitate the installation of the front fork 3. In this way, the frame 1 has higher structural stability. Since the frame 1 is a transition section connecting the front fork 3 for installing the front wheel 4 of the electronic bicycle to the rear fork 2, increasing the structural stability can improve the overall stability of the frame structure of the electronic bicycle. It is understood that the frame 1 can also be formed into other structures, such as a quadrangular structure or a fork-shaped structure consisting only of a combination of a middle frame post 102 and a lower frame tube 103. However, in terms of structural stability, the triangular-structured frame 1 in the embodiment of the present utility model is more stable.

[0015] As in Fig. 1-2 and 2, the above first hinge point M may be located at the lower end of the lower frame tube 103, which is also the rear end, and the lower frame tube 103 may be provided with two lower frame tube hinge holes 110, and the inner part of the lower frame tube 103 may be coaxially provided with a sleeve tube 109 at both lower frame tube hinge holes 110. Accordingly, an end of the lower rear fork tube 202 near the lower frame tube 103 is provided with a lower rear fork tube hinge hole, and this end of the lower rear fork tube 202 extends into the lower frame tube 103 and can then be inserted into the two sleeve tubes 109 and the lower rear fork tube hinge holes through the first hinge axis to complete the hinge connection between the lower rear fork tube 202 and the lower frame tube 103.

[0016] It should be noted that the rear fork 2 includes two sets of upper rear fork tubes 201 and lower rear fork tubes 202, one end of each upper rear fork tube 201 being connected to one end of the corresponding lower rear fork tube 202 to form a V-shaped structure, and the two V-shaped structures are arranged on the two sides of the rear wheel 5 of the electronic bicycle. As shown in Fig. 1-1, the V-shaped structure is further provided on the bottom with a rear axle clamping groove 207 and a transmission mounting hole 208 to facilitate the installation of the rear wheel 5 and the transmission. Furthermore, the upward side of the upper rear fork tube 201 is provided with a rear light band 206. In fact, the upper rear fork tubes 201, located on both sides, and the lower rear fork tubes 202 on both sides are connected to each other to form a V-shaped structure.In a specific embodiment, the corresponding positions of the two lower rear fork tubes 202 may all be provided with lower rear fork tube joint holes, and the first joint axis may be inserted into the two sleeve tubes 109 and the two lower rear fork tube joint holes to establish the joint connection between the two lower rear fork tubes 202 and the lower frame tube 103.

[0017] As in the Fig. 2 and Fig. 3, one end of the two lower rear fork tubes 202 may be joined together near the lower frame tube 103 to form a one-piece end portion, and through holes may be provided in the end portion to form the clamp tubes 209, or the two lower rear fork tubes 202, each provided with corresponding lower rear fork tube joint holes, may be welded or bonded at the joint holes to form the above clamp tubes 209, and then the first joint axis may be inserted into the two sleeve tubes 109 and the clamp tubes 209 to complete the joint connection between the two lower rear fork tubes 202 and the lower frame tube 103.In this way, the two lower rear fork tubes 202 form a unitary structure, which facilitates their installation and fastening and, on the other hand, the synchronous rotation of the two lower rear fork tubes 202 about the first pivot point M.

[0018] Furthermore, the outer ends of the two sleeve tubes 109 may be provided with a first curved plate 1091 protruding from the outer end surface of the corresponding housing 109 (the end facing away from the inner wall of the lower frame tube 103 is the outer end). And both ends of the clamp tube 209 are provided with a second curved plate 2091 protruding outward from the outer end surface thereof, and the sum of the respective circular center angles of the first curved plate 1091 and the second curved plate 2091 is less than 360 degrees, and both openings are opposite each other.With this arrangement, when the rear fork 2 rotates along the first pivot axis, the circumferential openings 210 of the first curved plate 1091 and the second curved plate 2091 are in contact with each other to limit the rotational range of the rear fork 2 and prevent the rotational range of the rear fork 2 from becoming excessive, to control the expansion and contraction of the rear fork damper 9 pivotally connected to the rear fork upper tube 201 to a certain extent, and to prevent damage to the rear fork damper due to excessive expansion and contraction. Note that the circumferential openings 210 refer to two end surfaces of each curved plate in its circumferential direction.

[0019] As in Fig. 2 and Fig. 3, the opening of the first curved plate 1091 faces the interior of the lower frame tube 103, while the opening of the second curved plate 2091 faces in the opposite direction, and the circumferential openings 210 of the first curved plate 1091 and the second curved plate 2091 must be able to abut each other. In this way, during installation, the clamping tubes 209 of the lower rear fork tube 202 cannot be inserted flat into the lower frame tube 103 to mate with the two sleeve tubes 109, but must be pushed under the two sleeve tubes 109 into the lower frame tube 103 to mate with the two sleeve tubes 109 (in the direction of the arrow in Fig. 2). This makes it less likely that the lower rear fork tube 202, which extends inside the lower frame tube 103, will slip out of the lower frame tube 103, facilitating installation and fastening between the two. It is understood that the orientation of the two curved plates can also be set in other forms (e.g., opposite to that shown in Fig. 3), as long as it is ensured that the openings of the two are opposite each other and that the circumferential openings 210 of the two curved plates can be pressed against each other during rotation of the rear fork 2 in order to limit the range of rotation of the rear fork 2.

[0020] It should be emphasized that the difference between the sum of the circular center angles of the first curved plate 1091 and the second curved plate 2091 and 360 degrees is the allowable rotation angle. Therefore, the above sum of the circular center angles corresponding to the first curved plate 1091 and the second curved plate 2091 is limited to less than 360 degrees to ensure that the rear fork 2 can rotate about the first pivot point M. However, the above sum of the circular center angles must not be set too small to avoid the rotation range of the rear fork 2 becoming too large. The technical solution of the present utility model does not limit the specific values ​​of the corresponding circular center angle of each curved plate and the sum of the circular center angles of the two, and the size of the specific values ​​can be determined by the on-site technicians in conjunction with the actual installation situation.

[0021] Furthermore, in the figure, an opening is provided at the rear end of the lower frame tube 103, and the front end of the rear fork lower tube 202 (shown as the clamp tube 209 in the figure) is inserted into the opening at the rear end of the lower frame tube 103, which is then pivotally connected to the first pivot axis. At this time, the rear fork 2 is provided with a first pivot hole, that is, the pivot hole for the rear fork lower tube (the hole for the clamp tube 209), and the rear end of the lower frame tube 103 necessarily requires two second pivot holes, that is, the two pivot holes for the lower frame tube 110. Due to the structural dimensions of the lower frame tube 103, it is easier to operate the rear fork 2 by inserting it into the lower frame tube 103 and pivoting it therein.

[0022] However, it is obvious that it is not limited to inserting the rear fork 2 into the lower frame tube 103, and it is also possible to set it in the reverse direction. Accordingly, all of the above arrangement positions of the curved plates can be arranged in the reverse direction, that is, the tubes and their curved plates at the ends are arranged at the rear end of the lower frame tube 103, and the rear fork 2 is provided with an opening at a front end and is provided with a sleeve tube and a curved plate structure on an inner wall corresponding to the joint holes thereof.

[0023] As in Fig. 1-1 and 4, the frame 1 is provided at an upper part with a limit pin 106, the rear fork upper tube 201 is provided at an end near the frame with an L-shaped limit slide 203 which fits with the limit pin 106, the L-shaped limit slide 203 comprising a lower hole and a side hole, a lower hole of the L-shaped limit slide 203 extending along the telescopic direction of the rear fork damper 9, the side hole extending in a direction substantially perpendicular to the extending direction of the lower hole, the upper end of a side hole being provided with an opening, the limit pin 106 being engaged from the opening of the side hole into the lower hole.

[0024] In particular, in this embodiment, with a view from Fig. 1-1, the upper part of the frame 1 may be formed with a rearwardly extending flared fork portion 1013. The flared fork portion 1013, in this embodiment, is a rearwardly extending extension of the upper frame tube 101 to form a deflection structure, and it may be fused to the center frame post 102 to form a single piece. Of course, the flared fork portion 1013 may also be formed by the lateral extension of the center frame post 102.

[0025] Both forks of the flared fork portion 1013 are provided with the limit pins 106 on the inner side, and the two upper rear fork tubes 201 located on both sides of the rear wheel 5 are each provided with L-shaped limit slides 203, so that the two limit pins 106 can be engaged with the L-shaped fastening slides 203 to firmly connect the upper rear fork tubes 201 to the frame 1. The lower hole extends along the telescopic direction of the rear fork damper 9, which also makes the sliding direction of the limit pins 106 in the lower hole consistent with the telescopic direction of the rear fork damper 9, thereby preventing interference with the telescopic direction of the rear fork damper 9 due to the connection of the upper rear fork tube 201 to the flared fork portion 1013, which in turn can impair the damping effect.In addition, the lower hole has a certain extension length, which means that the sliding range of the limit pin 106 in the lower hole is restricted and also prevents damage to the rear fork damper 9 due to the excessive telescopic range of the rear fork damper 9.

[0026] It should be noted that the present utility model does not further limit the extension lengths of the lower hole and the side holes of the above L-shaped limit chute 203, and in the process of specific design, the on-site technicians can determine the extension lengths of the corresponding lower holes and the side holes in accordance with actual needs.

[0027] With a view to Fig. 1-1, the side holes of the L-shaped limit slide 203 may be located at the right end of the lower hole and open at the upper end, that is, the limit holes are represented as a "lying" L. In this way, the limit pins 106 can be easily inserted into the lower hole through the openings of the side holes. After installation, when the rear fork 2 rotates clockwise around the first pivot point M due to uneven ground during operation of the electronic bicycle, the limit pins 106 can be pushed deeper into the lower hole to make the connection between the rear fork upper tube 201 and the frame 1 more secure.The above side hole may also be located at the left end of the lower hole, and the above side hole may also be open at the lower end, so that during the specific installation, the limit pins 106 can be inserted into the side holes from bottom to top through the openings of the side holes and into the lower holes, which can also meet the usage requirements.

[0028] It goes without saying that according to Fig. 4 the side holes are arranged on the front side of the lower holes (the side facing the front of the vehicle), which corresponds to the boundary structure (such as the one shown in Fig. 3) at the first pivot point M. During installation, the rear fork 2 needs to be slid down into the lower frame tube 103, then up, and then backward to fit into the sleeve tube 109. That is, there is a downward, upward, and backward coordinated installation process, and the same downward, upward, and backward installation process takes place when the upper limit structure, the L-shaped limit slide 203, is provided in correspondence with the side holes at the front, thereby better coordinating the upper and lower installation of the rear fork 2. Therefore, it is a preferable embodiment that the upper and lower installation can be coordinated or do not interfere with each other.

[0029] The limit pins (106) have a cylindrical structure, one end of which is fixed to a side wall of the forks and the other end of which is provided with an anti-release portion that engages the inside of the lower hole. The anti-release portion may be a spherical structure, and the diameter of the spherical structure is larger than the height of the lower hole. In the specific use, because the spherical structure is fixed to the inside of the lower hole, the limit pin 106 cannot be released from the lower hole along its axial direction, and the limit pin 106 can only be displaced in the extension direction of the lower hole.Of course, the anti-detachment portion may also be provided in other shapes, such as a tetrahedron, a hexahedron, or other three-dimensional structure, and regardless of the shape, it is necessary to ensure that the anti-detachment portion can be stuck on the inside of the lower hole when in use to prevent the limit pin 106 from detaching from the lower hole in its axial direction.

[0030] Considering the above solutions, the structure of the rear fork upper tubes 201 can also be further adapted, with the two rear fork upper tubes 201 connected at one end near the frame 1 to form a curved handle 211 with a downward opening. This structure allows the curved handle 211 to be directly lifted by hand for docking while inserting the limit pins 106 into the L-shaped limit chute 203, which facilitates installation and is easy to disassemble.

[0031] Furthermore, a protective cover 205 is provided above the limit pin 106. The protective cover 205 is a curved plate structure with a downward curved opening that covers the top of the limit pin 106 to prevent dust and other contaminants in the air from falling into the L-shaped limit chute 203, which would adversely affect the stability of the connecting structure of the frame 1 and the rear fork 2. Furthermore, the protective cover 205 is an extension of the structural shape of the curved handle 211, reflecting the integrity of the appearance.

[0032] As in Fig. As shown in Figure 1-1, a bracket for the rear fork damper installation groove frame 105 may be provided at the junction of the two forks of the flared fork section 1013. One end of the rear fork damper 9 is inserted into this rear fork damper installation groove frame 105 and is pivotally connected to this rear fork damper installation groove frame 105 via the first mounting axis 903 and the first two bearing pads 901.

[0033] The two upper rear fork tubes 201 are each provided with a fixing plate 204 on the inner side of one end of the two upper rear fork tubes 201 closest to the frame 1, for pivotally connecting to the other end of the rear fork damper 9. Specifically, one end of the fixing plate 204 is provided on the inner side of the upper rear fork tubes 201, and the other end extends toward the other upper rear fork tube 201 opposite thereto and has a bent portion provided with a pivot hole. The other end of the rear fork damper 9 is pivotally connected to the two fixing plates 204 by means of a second fixing shaft 904 and two second bearing pads 902.

[0034] It should be noted that the arrangement of the articulated structure of the two ends of the above rear fork damper 9 on the frame 1 and the rear fork 2 is only a preferred solution of the embodiment of the present utility model and cannot be considered as limiting the application scope of the rear damping system for the electric bicycle provided by the present utility model. Provided that the line direction between the first pivot point M and the second pivot point N is perpendicular to the telescopic direction of the rear fork damper 9, the two ends of the rear fork damper 9 can be arranged in any articulated structure.

[0035] In the Fig. 1-1, the first pivot point M is located at the rear lower end of the lower frame tube 103, the second pivot point N is located at the front upper end of the rear fork 2, and the third pivot point P is located at the rear end of the upper frame tube 101. As can be seen from the schematic diagram of the arrangement of the rear fork damper 9 of the Fig. 1-2, it is sufficient that the first pivot point M is located at the lower end and the second pivot point N and the third pivot point P are located relatively at the upper end of the arrangement, e.g., the first pivot point M can be located at the lower end of the frame center post 102 and the third pivot point P can also be located at the upper end of the center frame post 102. Of course, the arrangement in Fig. 1 makes more sense for a conventional triangular frame 1.

[0036] It should be noted that the above embodiment is taken as an example of an electronic bicycle, but it is clear that electronic bicycles equipped with the same type of rear damping system as described above, such as electronic motorcycles, can be constructed.

Claims

[1] An electric bicycle having a rear damping system comprising a rear damping system, a front wheel (4) and a rear wheel (5), the rear damping system comprising a frame (1), a rear fork damper (9) and a rear fork (2) for installing the rear wheel (5), the rear fork (2) comprising an upper rear fork tube (201) and a lower rear fork tube (202), characterized by in that the lower rear fork tube (202) is pivotally connected to the frame (1) at a first pivot point (M), wherein one end of the rear fork damper (9) is pivotally connected to the upper rear fork tube (201) at a second pivot point (N), while another end is pivotally connected to the frame (1) at a third pivot point (P), and wherein a line direction between the first pivot point (M) and the second pivot point (N) is perpendicular to a telescopic direction of the rear fork damper (9). [2] Electric bicycle with a rear damping system according to claim 1, characterized by in that the frame (1) comprises a lower frame tube (103), wherein the first pivot point (M) is located at a rear end of the lower frame tube (103), wherein a front end of the lower rear fork tube (202) is inserted into the rear end of the lower frame tube (103) and pivotally connected thereto by a first pivot axis, or wherein the rear end of the lower frame tube (103) is inserted into the front end of the lower rear fork tube (203) and pivotally connected thereto by a first pivot axis. [3] Electric bicycle with a rear damping system according to claim 2, characterized bythat the components of the lower rear fork tube (202) or the lower frame tube (103) which are inserted into the other component are provided with a first joint hole and the other component is provided with two second joint holes, wherein after insertion the first joint hole is located between the two second joint holes, wherein a sleeve tube (109) is provided coaxially on an inner wall corresponding to each of the two second joint holes;wherein each sleeve tube (109) is provided at an outer end with a first curved plate (1091) protruding from an outer end surface of the sleeve tube (109), wherein each end of the first hinge hole is provided with a second curved plate (2091) protruding from the outer end surface, wherein the first curved plate (1091) and the second curved plate (2091) have a corresponding round center angle which is less than 360 degrees in total, and openings of the two are opposite to each other, wherein, when the rear fork (2) is rotated along the first hinge axis, circumferential openings (210) of the first curved plate (1091) and the second curved plate (2091) are in mutual contact to limit a rotation range of the rear fork (2); [4] Electric bicycle with a rear damping system according to claim 3, characterized byin that the frame (1) is provided at an upper part with a limit pin (106), wherein the upper rear fork tube (201) is provided at an end near the frame with an L-shaped limit slide (203) which fits to the limit pin (106), wherein a lower hole of the L-shaped limit slide (203) extends along the telescopic direction of the rear fork damper (9), wherein the upper end of a side hole of the L-shaped limit slide (203) is provided with an opening, wherein the limit pin (106) engages from the opening of the side hole into the lower hole. [5] Electric bicycle with a rear damping system according to claim 4, characterized byin that the upper part of the frame (1) is provided with a rearwardly extending flared fork portion (1013), wherein the limit pins (106) are provided on an inner side of both forks of the flared fork portion (1013), wherein the upper rear fork tubes (201) are respectively provided with two of the L-shaped limit slides (203), wherein the limit pins (106) have a cylindrical structure, one end of which is fixed to a side wall of the forks and the other end of which is provided with an anti-release portion which engages with the inner side of the lower hole. [6] Electric bicycle with a rear damping system according to claim 1, characterized bythat the frame (1) is provided at an upper part with a rearwardly extending flared fork portion (1013), wherein the rear fork damper (9) is pivotally connected at one end to the flared fork portion (1013), wherein the third pivot point (P) is located at the flared fork portion (1013). [7] Electric bicycle with a rear damping system according to claim 6, characterized by in that the frame (1) comprises an upper frame tube (101), a middle frame post (102) and a lower frame tube (103), wherein the upper frame tube (101) extends rearwardly to form the flared fork portion (1013). [8] Electric bicycle with a rear damping system according to claim 1, characterized by that the second pivot point (N) is located at an end of the upper rear fork tube (201) close to the frame (1).

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