Shock-absorbing connector, frame, and vehicle

Abstract

A type of shock absorber connection device (400), frame, and vehicle. The shock absorber connection device (400) connects the front bracket (100), rear bracket (200), and seat bracket (300) of the frame. The shock absorber connection device (400) comprises a front joint (410), a rear joint (420), an intermediate joint (430), and a shock absorber member (440). The front joint (410) and the intermediate joint (430) are rotatably connected via a first pin shaft (401), the intermediate joint (430) and the rear joint (420) are rotatably connected via a second pin shaft (402), and the front joint (410) and the rear joint (420) are rotatably connected via a third pin shaft (403). The buffer member (440) is provided between the intermediate joint (430) and the front joint (410) or the rear joint (420), and deforms when the front joint (410) or the rear joint (420) rotates relative to the intermediate joint (430).

Description

Technical Field

[0001] (Related Application) This application claims the priority of Chinese Patent Application No. CN2023112539252 filed on September 27, 2023 and Chinese Patent Application No. CN2024107575450 filed on June 13, 2024.

[0002] The present disclosure relates to a buffer connection device, a buffer frame having the same, and a vehicle, and in particular, the vehicle is a bicycle or an electric bicycle.

Background Art

[0003] In existing bicycles, in order to improve the riding comfort, generally a buffer mechanism is provided below the seat, the elastic buffer direction of the buffer mechanism is set along the vertical direction, and an upward force is applied to the seat through the buffer mechanism during buffering. The buffer performance has a great influence on the comfort of the bicycle. Also, in some bicycles, the buffer device is attached to the front wheel fork or the rear wheel fork, or provided on both the front and rear forks, but all of these complicate the structure of the bicycle and increase the cost. In particular, it increases the weight of the entire frame, which is disadvantageous for the lightweight design of the bicycle. For example, in a certain existing bicycle frame structure, two elastic members are adopted and are respectively provided between the front frame and the seat bracket, and between the rear frame and the seat bracket. Although this can achieve front-wheel buffering and rear-wheel buffering, the overall mechanism is complex and the weight of the entire frame increases.

[0004] The above information disclosed in the section of the background art is only for deepening the understanding of the background of the present application, and thus may include information that does not constitute the prior art known to those skilled in the art.

Summary of the Invention

[0005] The present disclosure relates to a buffer connection device, a buffer frame having the same, and a bicycle or an electric bicycle, which, on the premise of good buffer performance, simplify the structure, have good structural stability at the same time, and contribute to the lightweight of the frame.

[0006] A first aspect of this disclosure provides a frame buffer connection device for connecting the front bracket, rear bracket and seat bracket of the frame. The buffer connection device is A front joint for connecting the rear end of the front bracket, A rear joint for connecting the front end of the rear bracket, An intermediate joint for connecting the lower end of the aforementioned seat bracket, A deformable cushioning member is provided, Here, the front joint and the intermediate joint are rotatably connected via a first pin shaft, the intermediate joint and the rear joint are rotatably connected via a second pin shaft, the front joint and the rear joint are movably connected via a third pin shaft, and the configuration allows the front joint or the rear joint to be inverted vertically relative to the intermediate joint. The cushioning member is provided between the intermediate joint and the front joint or the rear joint, and deforms when the front joint or the rear joint rotates relative to the intermediate joint.

[0007] In some embodiments, the rear end of the cushioning member is connected to the third pin shaft, and when the front joint or the rear joint is inverted vertically relative to the intermediate joint, the third pin shaft moves in the front-rear direction, causing the cushioning member to deform or return to its original shape.

[0008] In some embodiments, the front end of the buffer member is rotatably connected to the intermediate joint.

[0009] In some embodiments, the front of the intermediate joint is provided with a front restraining member having a rearward-facing front restraining surface, and the front joint or the rear joint is provided with a rear restraining member having a forward-facing rear restraining surface, and at least a portion of the front restraining surface and the rear restraining surface are planar, and the cushioning member is confined between the front restraining surface and the rear restraining surface and deforms when the front joint or the rear joint rotates relative to the intermediate joint.

[0010] The above-described shock-absorbing connection device enables the movable connection of the front bracket, rear bracket, and seat bracket, achieving interlocking shock absorption of the frame, resulting in excellent shock absorption. Furthermore, by providing only one set of shock-absorbing connection devices, the overall structure of the frame is simplified, contributing to frame weight reduction and maintaining good structural stability. In particular, since the shock-absorbing members are secured using the structure of the intermediate joint and the front joint or rear joint itself, there is no need to provide a separate securing or positioning mechanism, further contributing to structural simplification and vehicle weight reduction.

[0011] In some embodiments, the front end of the cushioning member abuts against the front restraining surface, and the rear end of the cushioning member abuts against the rear restraining surface.

[0012] In some embodiments, during the process in which the front joint or the rear joint reverses relative to the intermediate joint, the front restraining surface and the rear restraining surface are both parallel to each other.

[0013] In some embodiments, the rear restraint member is rotatably mounted on the front joint via a fourth pin shaft, and the rear joint has a contact portion that abuts against the rear side of the rear restraint member, or the rear restraint member is rotatably mounted on the rear joint via a fourth pin shaft, and the front joint has a contact portion that abuts against the rear side of the rear restraint member. The contact portion is configured such that the rear restraining surface maintains parallelism with the front restraining surface.

[0014] In some embodiments, the rear restraint member is suspended from the front joint via the fourth pin shaft, and the contact portion has an arc-shaped contact surface projecting forward, and in the process of the front joint or the rear joint reversing relative to the intermediate joint, the rear restraint member and the contact surface slide and engage, so that the rear restraint surface maintains a vertical position.

[0015] In some embodiments, a mounting space is formed between the intermediate joint and the rear restraint member, the cushioning member is provided in and confined within the mounting space, the cushioning member is provided along the front-rear direction and is deformable along the front-rear direction, and the cushioning member includes a compression spring or a gas spring.

[0016] In some embodiments, the front restraining member has a front restraining groove, and the front end of the cushioning member is located within the front restraining groove; the rear restraining member has a rear restraining groove, and the rear end of the cushioning member is located within the rear restraining groove.

[0017] In some embodiments, the intermediate joint comprises two side plates and one connecting pipe, the two side plates being spaced apart from each other, the connecting pipe being connected between the upper parts of the two side plates, a first through hole extending vertically being provided in the connecting pipe, the lower end of the seat bracket passing through the through hole, and the first pin shaft being inserted into the connecting pipe and passing through the front joint, the side plates and the lower end of the seat bracket.

[0018] In some embodiments, the lower end of the intermediate joint and the lower end of the rear joint are rotatably connected via the second pin shaft, the lower end of the front joint and the upper end of the rear joint are rotatably connected via the third pin shaft, and at least one of the lower end of the front joint and the upper end of the rear joint has a shaft hole that engages with the third pin shaft, the shaft hole being an elongated or arc-shaped hole, and the third pin shaft being slidably inserted into the shaft hole, allowing relative movement between the front joint and the rear joint.

[0019] In some embodiments, the rear joint is provided with a pedal tube for mounting a pedal, and the pedal tube is located behind the second pin shaft.

[0020] In some embodiments, the rear stop member and the rear joint are fixedly connected or integrally provided, or the rear stop member and the front joint are fixedly connected or integrally provided.

[0021] Another aspect of the present disclosure provides a frame including a front bracket provided with a front wheel, a rear bracket provided with a rear wheel, and a seat bracket provided with a seat, wherein the front bracket, the rear bracket, and the seat bracket are connected via the buffer connection device.

[0022] In some embodiments, the rear bracket a rear wheel seat for attaching a rear wheel, an upper link having a front end hinged to the buffer connection device and a rear end hinged to the rear wheel seat, and a lower link having a front end hinged to the buffer connection device and a rear end hinged to the rear wheel seat.

[0023] In some embodiments, the upper link is located above the lower link, the front end of the upper link is hinged to the third pin shaft, and the front end of the lower link is hinged to the second pin shaft.

[0024] The present disclosure also provides a bicycle including a frame, wherein the frame includes the buffer connection device or the frame as described above.

[0025] The present disclosure also provides an electric bicycle including a frame and a battery, wherein the frame includes a front bracket provided with a front wheel, a rear bracket provided with a rear wheel, and a seat bracket provided with a seat, the battery is provided on the front bracket or the rear bracket, and the frame also includes the buffer connection device or the frame as described above.

[0026] The present disclosure also provides a buffer frame, which A front bracket for attaching a front wheel and a steering assembly, A rear bracket for attaching a rear wheel, wherein the rear bracket is movably connected to the rear end of the front bracket via its front end, A seat bracket for attaching a seat and an elastic buffer member, wherein the elastic buffer member is rotatably connected to the seat bracket via its front end, The front bracket and the rear bracket are each rotatably connected to the seat bracket via a first pivot and a second pivot, and the first pivot is located above the second pivot. At least one of the front bracket and the rear bracket is rotatably connected to the rear end of the elastic buffer member via a third pivot, the third pivot is located between the first pivot and the second pivot, and the front end of the elastic buffer member is located in front of the connecting line of the first pivot and the second pivot. The elastic buffer member has an initial position and a compressed position. When the elastic buffer member is in the initial position, neither the front wheel nor the rear wheel is lifted, and the third pivot is in a first position. When the elastic buffer member is in the compressed position, the front wheel and / or the rear wheel is lifted, and the third pivot moves forward from the first position to a second position.

[0027] In some embodiments, the rear end of the front bracket is curved downward to form a first curved portion, the front end of the rear bracket is curved upward to form a second curved portion, and the first curved portion is movably connected to the upper end of the second curved portion via its lower end.

[0028] In some embodiments, at least one of the first curved portion and the second curved portion is rotatably connected to the rear end of the elastic buffer member via the third pivot.

[0029] In some embodiments, when the front wheel is lifted, the first curved portion rotates forward around the first pivot, and when the rear wheel is lifted, the second curved portion rotates forward around the second pivot.

[0030] In some embodiments, the seat bracket is provided along the vertical direction, the lower part of the seat bracket protrudes forward to form a front projection, and the elastic cushioning member is rotatably connected to the front projection via its front end.

[0031] In some embodiments, one of the front bracket and the rear bracket is provided with a first circular hole through which the third pivot fits and passes, and the other is provided with a first elongated hole through which the third pivot passes.

[0032] In some embodiments, one of the front bracket and the rear bracket is provided with a second circular hole through which the third pivot fits and passes, and the two are movably connected via a fourth pivot, one of which is provided with a third circular hole through which the fourth pivot fits and passes, and the other is provided with a second elongated hole through which the fourth pivot passes.

[0033] In some embodiments, the elastic stretching direction of the elastic cushioning member is set along the front-to-back horizontal direction.

[0034] In some embodiments, when the elastic cushioning member is in the initial position, the first position of the third pivot is located behind the connecting line between the first and second pivots, and when the elastic cushioning member is in the compressed position, the second position of the third pivot is located in front of the connecting line between the first and second pivots.

[0035] One type of bicycle is equipped with the aforementioned shock-absorbing frame.

[0036] The frame of this disclosure achieves movable connection of the front bracket, rear bracket, and seat bracket by the above-described shock-absorbing connection device, realizing interlocking shock absorption of the frame, providing good shock absorption effect, and by providing only one set of shock-absorbing connection devices, the overall structure of the frame is simplified, contributing to frame weight reduction, and having good structural stability. The elastic shock-absorbing member has its front end connected to the seat bracket, and when the front wheel or rear wheel is lifted, the elastic shock-absorbing member can be compressed forward via the rotation of the front bracket or rear bracket, not only realizing front wheel shock absorption or rear wheel shock absorption, but also providing forward propulsion force to the seat bracket via the elastic shock-absorbing member, which can reduce the difficulty of cycling.

[0037] To more clearly illustrate the technical solutions of this disclosure, the drawings necessary for describing the embodiments are briefly introduced below. Obviously, the drawings in the following description represent only some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these without any creative work. [Brief explanation of the drawing]

[0038] [Figure 1] Figure 1 is a structural diagram of a type of buffer frame according to a specific embodiment of the present invention. [Figure 2] Figure 2 is an exploded perspective view of a type of buffer frame according to a specific embodiment of the present invention. [Figure 3] Figure 3 is a structural diagram of a second frame according to an embodiment of the present invention. [Figure 4] Figure 4 is a magnified view of section A in Figure 3. [Figure 5] Figure 5 is a perspective view of a second seat bracket and cushioning connection device according to an embodiment of the present invention. [Figure 6] Figure 6 is an exploded view of a second seat bracket and cushioning connection device according to an embodiment of the present invention. [Figure 7] Figure 7 is a structural diagram of a third frame according to an embodiment of the present invention. [Figure 8]Figure 8 is a perspective view from one viewpoint of a third buffer connection device according to an embodiment of the present invention. [Figure 9] Figure 9 is a perspective view from another viewpoint of the third buffer connection device according to an embodiment of the present invention. [Figure 10] Figure 10 is an exploded view of a third buffer connection device according to an embodiment of the present invention. [Figure 11] Figure 11 is a cross-sectional view of a third frame according to an embodiment of the present invention, and the intermediate joint and buffer member are not shown. [Figure 12] Figure 12 is a magnified view of section B in Figure 11. [Figure 13] Figure 13 is a side view of a fourth frame according to an embodiment of the present invention. [Figure 14] Figure 14 is a perspective view of a fourth frame according to an embodiment of the present invention. [Modes for carrying out the invention]

[0039] The technical solutions of this disclosure will be further explained below, with reference to specific embodiments and drawings.

[0040] The following briefly describes only a few exemplary embodiments. As those skilled in the art will recognize, the embodiments described can be modified in various different ways without departing from the spirit or scope of the embodiments of this disclosure. Therefore, the drawings and description should be considered as illustrative and not limiting in nature.

[0041] Figures 1 through 14 are drawn to actual scale, and in order to maintain the conciseness of the specification, the proportions of each element are not listed one by one; however, the proportions and positions of each element should be considered as part of the content of this specification.

[0042] In the description of embodiments of this disclosure, the orientations or positional relationships indicated by terms such as "up," "down," "front," and "back" are based on the orientations or positional relationships shown in the drawings and are merely for the purpose of describing and simplifying the embodiments of this disclosure, and do not indicate that the indicated or implied devices or elements must have a particular orientation, be configured or operated in a particular orientation, and therefore should not be understood as limitations on embodiments of this disclosure.

[0043] Furthermore, the terms “first” and “second” are used for descriptive purposes only and do not indicate, suggest, or implicitly represent relative importance or the number of technical features referred to. Thus, features limited by “first” and “second” may explicitly or implicitly include one or more such features. In the description of embodiments of this disclosure, “multiple” means two or more, unless otherwise specifically limited.

[0044] In embodiments of the present disclosure, unless otherwise explicitly stated or limited, the presence of a first feature "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features without direct contact, but through another feature between them. The presence of a first feature "above," "above," or "on the top surface" of a second feature may include the first feature being directly above or diagonally above the second feature, or simply indicating that the horizontal height of the first feature is greater than that of the second feature. The presence of a first feature "below," "below," or "on the bottom surface" of a second feature may include the first feature being directly below or diagonally below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0045] The following disclosure provides many different embodiments or examples for realizing different structures of the embodiments of this disclosure. To simplify the disclosure of the embodiments of this disclosure, the following describes the parts and settings of a particular example. Of course, these are merely examples and do not limit the embodiments of this disclosure. Furthermore, the embodiments of this disclosure may repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarification and does not itself indicate relationships between the various embodiments and / or settings being discussed.

[0046] Figures 1 and 2 show a type of shock absorber frame provided by this embodiment, comprising a front bracket 1, a rear bracket 4, and a seat bracket 6. Here, the front bracket 1 is used to mount the front wheel 2 and steering assembly 3, and the rear bracket 4 is used to mount the rear wheel 5. The front bracket 1, rear bracket 4, and seat bracket 6 are movably connected via a single shock absorber connection device. The structure of the shock absorber connection device will be described in detail below.

[0047] The rear bracket 4 is movably connected to the rear end of the front bracket 1 via its front end, and the seat bracket 6 is used to mount the seat and the elastic cushioning member 7, which is a cushioning member and is elastically deformable. The elastic cushioning member 7 is rotatably connected to the seat bracket 6 via its front end. In this embodiment, the seat bracket 6 is provided at an inclination in the vertical direction, and the lower part of the seat bracket 6 protrudes forward to form a front projection 61, and the elastic cushioning member 7 is rotatably connected to the front projection 61 via its front end. In this embodiment, the lower end portion of the seat bracket 6 is the intermediate joint.

[0048] The front bracket 1 is connected to the seat bracket 6 via a first pivot 8, and the rear bracket 4 is rotatably connected to the seat bracket 6 via a second pivot 9, specifically to the intermediate joint of the seat bracket 6. The first pivot 8 is located above the second pivot 9, and the two are parallel to each other and parallel in the left-right horizontal direction.

[0049] The front bracket 1 is rotatably connected to the seat bracket 6 via a first pivot 8, the rear bracket 4 is rotatably connected to the seat bracket 6 via a second pivot 9, the front bracket 1 is rotatably connected to the rear bracket 4 via a third pivot 10, and the rear end of the elastic cushioning member 7 is rotatably connected to the third pivot 10. In the example shown in Figures 1 and 2, the front bracket 1 only rotates around its pivot (first pivot 8) relative to the seat bracket 6, and no relative translational motion occurs between them. The rear bracket 4 only rotates around its pivot (second pivot 9) relative to the seat bracket 6, and no relative translational motion occurs between them. Between the front bracket 1 and the rear bracket 4, in addition to rotational motion around its pivot (third pivot 10), a small amount of relative translational motion occurs. Here, the front bracket 1 is provided with a first elongated hole 12 through which the third pivot 10 passes, and the rear bracket 4 is provided with a first circular hole 42 into which the third pivot 10 fits and passes. The third pivot 10 is inserted into the first circular hole 42 on the rear bracket 4 and the first elongated hole 12 on the front bracket 1, and can move slightly within the first elongated hole 12, allowing relative deformation movement between the front bracket 1, the rear bracket 4 and the seat bracket 6. In other words, when the front bracket 1 rotates relative to the seat bracket 6 around the first pivot 8 due to the action of an external force, the rear bracket 4 simultaneously rotates relative to the seat bracket 6 around the second pivot 9 due to the action of the third pivot 10, or when the rear bracket 4 rotates relative to the seat bracket 6 around the second pivot 9 due to the action of an external force, the front bracket 1 simultaneously rotates relative to the seat bracket 6 around the first pivot 8 due to the action of the third pivot 10, thereby realizing that the front bracket 1 and the rear bracket 4 rotate in conjunction with the seat bracket 6. With this structure, interlocking damping of the frame can be achieved, and the damping effect of the frame is improved.

[0050] In another embodiment, one of the front bracket 1 and the rear bracket 4 is provided with a second circular hole through which the third pivot 10 fits and passes, and the rear end of the elastic cushioning member 7 is rotatably connected to the third pivot 10. The front bracket 1 and the rear bracket 4 are movably connected via a fourth pivot, which is parallel to the first pivot 8. One of the front bracket 1 and the rear bracket 4 is provided with a third circular hole through which the fourth pivot fits and passes, and the other is provided with a second elongated hole through which the fourth pivot passes. With this configuration, when the front bracket 1 and the rear bracket 4 rotate relative to the seat bracket 6, relative motion also occurs between the front bracket 1 and the rear bracket 4.

[0051] The third pivot 10 is located between the first pivot 8 and the second pivot 9, the front end of the elastic cushioning member 7 is located in front of the connecting line between the first pivot 8 and the second pivot 9, the pivot axis centerline of the front end of the elastic cushioning member 7 is parallel to the first pivot 8, the elastic cushioning member 7 has an initial position and a compressed position, when the elastic cushioning member 7 is in the initial position neither the front wheel 2 nor the rear wheel 5 is lifted and the third pivot 10 is located behind the connecting line between the first pivot 8 and the second pivot 9, when the elastic cushioning member 7 is in the compressed position the front wheel 2 and / or the rear wheel 5 are lifted and the third pivot 10 is located in front of the connecting line between the first pivot 8 and the second pivot 9 and the elastic cushioning member 7 is compressed.

[0052] In this embodiment, the rear end of the front bracket 1 curves downward to form a first curved portion 11 (i.e., the front joint), and the front end of the rear bracket 4 curves upward to form a second curved portion 41 (i.e., the rear joint). The first curved portion 11 is movably connected to the upper end of the second curved portion 41 via its lower end, and the first pivot 8 and the second pivot 9 are inserted through the first curved portion 11 and the second curved portion 41, respectively. The first circular hole 42 is provided at the upper end of the second curved portion 41 and is higher than the second pivot 9, while the first elongated hole 12 is provided at the lower end of the first curved portion 11 and is lower than the first pivot 8.

[0053] When the front wheel 2 is lifted, the first curved section 11 rotates forward around the first pivot 8, compressing the elastic shock absorber 7 forward. When the rear wheel 5 is lifted, the second curved section 41 rotates forward around the second pivot 9, compressing the elastic shock absorber 7 forward.

[0054] In this embodiment, when the elastic cushioning member 7 is in its initial position and compressed position, the third pivot 10 has a first position located behind the connecting line between the first pivot 8 and the second pivot 9, and a second position located in front of the connecting line between the first pivot 8 and the second pivot 9, where the midpoint of the connecting line between the first and second positions lies on the connecting line between the first pivot 8 and the second pivot 9. In this embodiment, the elastic cushioning member 7 includes a gas spring.

[0055] One type of bicycle is equipped with the aforementioned shock-absorbing frame.

[0056] The following will provide a detailed explanation of the usage process of the frames shown in Figures 1 and 2. When the front wheel 2 encounters an obstacle, the front bracket 1 rotates clockwise to lift the front wheel 2, compressing the elastic cushioning member 7 forward via the first curved portion 11, cushioning the front wheel 2 and simultaneously providing forward propulsion to the seat bracket 6.

[0057] When the rear wheel 5 encounters an obstacle, the rear bracket 4 rotates counterclockwise to lift the rear wheel 5, compressing the elastic cushioning member 7 forward via the second curved portion 41, cushioning the rear wheel 5 and simultaneously providing forward propulsion to the seat bracket 6.

[0058] Figures 2 to 6 show a second frame provided by this embodiment. Referring to Figures 2 to 6, the frame comprises a front bracket 100, a rear bracket 200, and a seat bracket 300. The front bracket 100 is fitted with a front wheel 101 and a steering member 102, the steering member 102 controls the direction of the front wheel 101, thereby enabling steering of the frame. The rear bracket 200 is located behind the front bracket 100, and the rear wheel is fitted to the rear bracket 200. The seat bracket 300 extends vertically, and the seat is fitted to the seat bracket 300.

[0059] The frame also includes a shock-absorbing connector 400, which connects the front bracket 100, the rear bracket 200, and the seat bracket 300. Specifically, the front bracket 100, the rear bracket 200, and the seat bracket 300 are movablely connected by only one of the shock-absorbing connectors 400. The shock-absorbing connector 400 comprises a front joint 410, a rear joint 420, an intermediate joint 430, and a shock-absorbing member 440. The front joint 410 is connected to the rear end of the front bracket 100 and can be a fixed connection. In other embodiments, the front joint 410 can be an integral part of the front bracket 100. The rear joint 420 is connected to the front end of the rear bracket 200 and can be a fixed connection. In other embodiments, the rear joint 420 can be an integral part of the rear bracket 200. The intermediate joint 430 is connected to the lower end of the seat bracket 300 and can be a fixed connection. In other embodiments, the intermediate joint 430 can be an integral part with the seat bracket 300. The cushioning member 440 is deformable, and after being subjected to an external force, the cushioning member 440 elastically deforms to provide cushioning, reducing or canceling vibrations acting on the seat bracket 300 and thus performing a cushioning action.

[0060] The front joint 410 and the intermediate joint 430 are rotatably connected via a first pin shaft 401, the intermediate joint 430 and the rear joint 420 are rotatably connected via a second pin shaft 402, and the front joint 410 and the rear joint 420 are rotatably connected via a third pin shaft 403. The axis centers of these three pivots are parallel to each other and extend horizontally in the left-right direction. In the examples shown in Figures 2 to 6, the first pin shaft 401 is higher than the third pin shaft 403, and the third pin shaft 403 is higher than the second pin shaft 402. In the examples shown in Figures 2 to 6, the front joint 410 only rotates around the pivot (first pin shaft 401) relative to the intermediate joint 430, and no relative translational motion occurs between them. The rear joint 420 only rotates around its pivot (second pin shaft 402) relative to the intermediate joint 430, and no relative translational motion occurs between them. Between the front joint 410 and the rear joint 420, in addition to rotational motion around its pivot (third pin shaft 403), a slight relative translational motion occurs. Here, the front joint 410 has a shaft hole 411, which is an elongated hole, and the rear joint 420 has a circular hole that fits with the third pin shaft 403. The third pin shaft 403 is inserted into the circular hole of the rear joint 420 and the shaft hole 411, and can move slightly within the shaft hole 411, allowing relative deformation motion between the front joint 410, the rear joint 420 and the intermediate joint 430. In other words, when the front joint 410 rotates relative to the intermediate joint 430 around the first pin shaft 401 due to the action of an external force, the rear joint 420 simultaneously rotates relative to the intermediate joint 430 around the second pin shaft 402 due to the action of the third pin shaft 403, or when the rear joint 420 rotates relative to the intermediate joint 430 around the second pin shaft 401 due to the action of an external force, the front joint 410 simultaneously rotates relative to the intermediate joint 430 around the first pin shaft 401 due to the action of the third pin shaft 403, thereby realizing that the front joint 410 and the rear joint 420 rotate in conjunction with the intermediate joint 430. With this structure, interlocking damping of the frame can be achieved, and the damping effect of the frame can be improved. In actual structural design, the direction and size of the elongated hole should be such that the travel distance of the third pin shaft 403 within the elongated hole reaches the minimum value, which maximizes the interlocking damping effect of the frame.In some other embodiments, the shaft hole 411 may be provided in the rear joint 420, and a circular hole for fitting with the third pin shaft 403 is provided in the front joint 410.

[0061] A front restraining member 431 is provided at the front of the intermediate joint 430, and the front restraining member 431 has a front restraining surface facing rear. A rear restraining member 421 is provided at the front joint 410 or the rear joint 420, and the rear restraining member 421 has a rear restraining surface facing forward. The buffer member 440 is confined between the front restraining surface of the front restraining member 431 and the rear restraining surface of the rear restraining member 421, and deforms when the front joint 410 or the rear joint 420 rotates relative to the intermediate joint 430. Specifically, in the embodiment shown in Figures 2 to 6, the rear restraining member 421 is provided on the rear joint 420. The front restraining member 431 is located in front of the rear restraining member 421, and the buffer member 440 as a whole extends in the front-rear direction and is elastically deformable in the front-rear direction. At least a portion of the front restraining surface and the rear restraining surface are planar.

[0062] In the examples shown in Figures 2 to 6, the buffer member 440 is a compression spring. The front end of the buffer member 440 contacts and fits with the front restraint member 431, and the rear end of the buffer member 440 contacts and fits with the rear restraint member 421. The front restraint member 431 has a front restraint groove, and its front restraint surface is the bottom wall of the groove. The front end of the buffer member 440 is located within the front restraint groove and abuts against the front restraint surface. The rear restraint member 421 has a rear restraint groove 422, and its rear restraint surface is the bottom wall of the groove. The rear end of the buffer member 440 is located within the rear restraint groove 422 and abuts against the rear restraint surface. Furthermore, a mounting space is enclosed and formed between the intermediate joint 430 and the rear restraint member 421, and the buffer member 440 is provided in and confined within this mounting space. The left and right side plates of the intermediate joint 430 restrain the cushioning member 440 in the left-right direction, and the front restraining member 431 and the rear restraining member 421 work together to confine the cushioning member 440 within this mounting space, preventing it from falling out or becoming detached.

[0063] The intermediate joint 430 comprises two side plates 432 and one connecting pipe 433. The two side plates 432 are spaced apart from each other, and the connecting pipe 433 is connected between the upper parts of the two side plates 432. A first through-hole extending vertically is provided on the connecting pipe 433, and the lower end of the seat bracket 300 passes through the through-hole and is fixedly connected to the connecting pipe 433, thereby connecting the intermediate joint 430 to the seat bracket 300. The first pin shaft 401 is inserted into the connecting pipe 433 and passes through the front joint 410, the side plates 432 and the lower end of the seat bracket 300, realizing a pivot connection between the front joint 410 and the intermediate joint 430.

[0064] Furthermore, the lower end of the intermediate joint 430 and the lower end of the rear joint 420 are rotatably connected via a second pin shaft 402, and the lower end of the front joint 410 and the upper end of the rear joint 420 are rotatably connected via a third pin shaft 403. The rear joint 420 is provided with a pedal tube 423 for attaching a pedal, and the pedal tube 423 is located behind the second pin shaft 402. The third pin shaft 403 is located behind the rear restraint member 421.

[0065] This embodiment also provides a bicycle having the above-described frame, wherein a front wheel 101 is provided on the front bracket 100 of the frame, and a rear wheel is provided on the rear bracket 200. Specifically, this bicycle is driven forward by human power. Specifically, pedals are provided on the rear joint 420, and by pedaling, the rear wheel is driven in cooperation with the chain and sprocket, causing the bicycle to move forward.

[0066] This embodiment also provides an electric bicycle comprising a battery and the frame described above, wherein a front wheel 101 is provided on the front bracket 100 of the frame, a rear wheel is provided on the rear bracket 200, and the battery is provided on either the front bracket 100 or the rear bracket 200. The battery drives the front wheel 101 or the rear wheel, propelling the electric vehicle forward. This electric vehicle is typically an electric bicycle or an electric assist bicycle.

[0067] The cushioning principle of the frame is as follows: When traveling on uneven ground, if the front wheel 101 encounters a slope and lifts upward, the front bracket 100 and front joint 410 invert toward the road surface, and at the same time the frame receives an impact force, the seat bracket 300 moves downward due to the weight of the rider, and the rear bracket 200 and rear joint 420 synchronously invert toward the road surface toward the seat bracket 300 and intermediate joint 430 due to the action of the third pin shaft 403, causing the cushioning member 440 to receive force and be compressed, thus providing cushioning. Since the front bracket 100 and rear bracket 200 simultaneously apply force to the cushioning member 440, the frame achieves synchronized cushioning. Similarly, when the rear wheel 201 encounters a slope and lifts upward, the cushioning principle is the same as described above.

[0068] The frame achieves movable connection of the front bracket 100, rear bracket 200, and seat bracket 300 by a specific cushioning connection device 400, thereby achieving interlocking cushioning of the frame and providing good cushioning effect. Moreover, by providing only one set of cushioning connection devices 400, the overall structure of the frame is simplified, contributing to frame weight reduction and good structural stability. In particular, since the cushioning member 440 is restrained using the structure of the intermediate joint 430 and the front joint 410 or rear joint 420 themselves, there is no need to provide a separate restraining or positioning mechanism, further contributing to structural simplification and frame weight reduction.

[0069] Figures 7 to 12 show a third frame provided by this embodiment, the only difference from the frames shown in Figures 2 to 6 being the buffer connection device. Referring to Figures 7 to 12, this buffer connection device includes a front joint, a rear joint, an intermediate joint, a front restraining member, a rear restraining member, and a buffer member, the front joint 410 is connected to the rear end of the front bracket 100, the rear joint 420 is connected to the front end of the rear bracket 200, and the intermediate joint 430 is connected to the lower end of the seat bracket 300.

[0070] Furthermore, the third pin shaft 403 passes through the front joint 410, the rear joint 420, and the intermediate joint 430 in sequence. The intermediate joint 430 has a first through hole 434, which is either an arc-shaped hole or an elongated hole. As the front joint 410 and the rear joint 420 move relative to each other, the third pin shaft 403 also moves within the first through hole 434. This configuration is advantageous for improving the stability of the buffer connection device 400.

[0071] In the examples shown in Figures 7 to 12, the front restraining member 431 and the intermediate joint 430 are integrated, and the rear restraining member 421 is movably attached to either the front joint 410 or the rear joint 420.

[0072] The front restraining member 431 has a front restraining surface 431a that contacts and fits with the front end of the cushioning member 440, and the rear restraining member 421 has a rear restraining surface 421a that contacts and fits with the rear end of the cushioning member 440. At least a portion of the front restraining surface 431a and the rear restraining surface 421a are planar, and in the example shown in the figure, the entire front restraining surface 431a and the rear restraining surface 421a are both planar and parallel to each other. The front and rear ends of the cushioning member 440 abut against the front restraining surface 431a and the rear restraining surface 421a, respectively, and deform linearly between them, not curving or bulging outwards in any way. Furthermore, no other connecting parts are provided between the cushioning member 440 and the front restraining member 431, or between the cushioning member 440 and the rear restraining member 421. When encountering uneven ground, the front braking surface 431a of the front braking member 431 and the rear braking surface 421a of the rear braking member 421 remain nearly parallel during the process of the front wheel 101 or rear wheel 201 inverting upwards. This configuration prevents the cushioning member 440 from bending and eliminates the risk of the cushioning member 440 bulging outwards or even flying out.

[0073] In the example shown in Figures 7 to 12, the rear restraint member 421 is rotatably mounted on the front joint 410 via a fourth pin shaft 404, and the rear joint 420 has a contact portion 424 that abuts against the rear side of the rear restraint member 421. The contact portion 424 is configured such that the rear restraint surface 421a maintains parallelism with the front restraint surface 431a. In another embodiment, the rear restraint member 421 is rotatably mounted on the rear joint 420 via a fourth pin shaft 404, and the front joint 410 has a contact portion 424 that abuts against the rear side of the rear restraint member 421. The contact portion 424 is configured such that the rear restraint surface 421a maintains parallelism with the front restraint surface 431a.

[0074] Furthermore, the rear restraint member 421 is suspended from the front joint 410 via the fourth pin shaft 404, and the contact portion 424 has an arc-shaped contact surface that protrudes forward. In the process of the front joint 410 or the rear joint 420 reversing relative to the intermediate joint 430, the rear restraint member 421 and the contact surface slide and engage, so that the rear restraint surface 421a always remains parallel to the front restraint surface 431a of the front restraint member 431.

[0075] The fourth pin shaft 404 passes through the front joint 410, the intermediate joint 430, and the rear restraint member 421 in sequence, suspending the rear restraint member 421 on the front joint 410. Here, the intermediate joint 430 is provided with a second through hole 435, which is either an arc-shaped hole or an elongated hole, and the center of the arc-shaped hole lies on the axis centerline of the fourth pin shaft 404. The upper end of the rear restraint member 421 has a pin shaft hole through which the fourth pin shaft 404 can pass. During the process of the front joint 410 or rear joint 420 inverting relative to the intermediate joint 430, as the front joint 410 or rear joint 420 inverts relative to the intermediate joint 430, the rear restraining member 421 also rotates accordingly. With the cooperation of the contact portion 424, the rear restraining surface 421a of the rear restraining member 421 always remains parallel to the front restraining surface 431a of the front restraining member 431, ensuring that the cushioning member 440 remains positioned in the front-rear direction and does not curve or bulge outward. This configuration is advantageous in improving structural stability and eliminating the risk of the cushioning member 440 bulging outward or popping out.

[0076] The cushioning principle of the frame is as follows: When traveling over uneven ground, if the front wheel 101 is lifted upward, the front joint 410 inverts downward, bringing the rear joint 420 and the intermediate joint 430 closer together, compressing the cushioning member 440 and damping vibrations. If the rear wheel 201 is lifted upward, the rear joint 420 inverts downward and forward, bringing the rear braking member 421 closer to the front braking member 431, compressing the cushioning member 440 and damping vibrations. Whether the front wheel 101 or the rear wheel 201 is inverted, the front-to-rear distance between the front braking member 431 and the rear braking member 421 changes, causing the cushioning member 440 to deform or return to its original state accordingly. However, the rear braking member 421 rotates by a certain angle accordingly, and the rear braking surface 421a always remains parallel to the front braking surface 431a.

[0077] In addition to providing a cushioning function, this frame further improves structural stability and reduces, or even eliminates, the risk of the cushioning material bending, bulging, or even protruding outwards.

[0078] Figures 13 and 14 show a fourth frame of this embodiment. Referring to Figures 13 and 14, the structure of the buffer connection device 400 therein is basically the same as the structure of the example shown in Figures 1 and 2, the difference being mainly in the structure of the rear bracket 200. In the example shown in Figures 1 and 2, the front end of the rear frame 200 is fixed to the rear joint 420, and the axle of the rear wheel 201 is rotatably connected to the rear end of the rear frame 200. On the other hand, in Figures 13 and 14, the rear frame 200 comprises a rear wheel seat 203, an upper link 202, and a lower link 204. Here, the rear wheel seat 203 is used to mount the rear wheel 201, and specifically, the axle of the rear wheel 201 is rotatably inserted into the rear wheel seat 203. The upper link 202 extends as a whole in the longitudinal direction of the frame and has a front end that is hinged to the shock absorber connection device 400 and a rear end that is hinged to the rear wheel seat 203. The lower link 204 extends as a whole in the longitudinal direction of the frame and has a front end that is hinged to the shock absorber connection device 400 and a rear end that is hinged to the rear wheel seat 203.

[0079] As shown in Figures 13 and 14, the upper link 202 is located above the lower link 204. The front end of the upper link 202 is hinged to the third pin shaft 403, and the front end of the lower link 204 is hinged to the second pin shaft 402. The upper link 202, rear wheel seat 203, lower link 204, and shock absorber connection device 400 constitute a four-bar linkage mechanism. The upper link 202, rear wheel seat 203, and lower link 204 are provided on both the left and right sides of the rear wheel 201, respectively. In other words, the rear wheel 201 and the shock absorber connection device 400 are connected via two four-bar linkage mechanisms, providing superior connection strength, stability, and reliability.

[0080] The features of the embodiments of this disclosure are described in the following clauses.

[0081] Clause 1, a buffer connecting device for the frame for connecting the front bracket, rear bracket and seat bracket of the frame, wherein the buffer connecting device is A front joint for connecting the rear end of the front bracket, A rear joint for connecting the front end of the aforementioned rear bracket, An intermediate joint for connecting the lower end of the aforementioned seat bracket, A deformable cushioning member is provided, Here, the front joint and the intermediate joint are rotatably connected via a first pin shaft, the intermediate joint and the rear joint are rotatably connected via a second pin shaft, the front joint and the rear joint are movably connected via a third pin shaft, and the configuration allows the front joint or the rear joint to be inverted vertically relative to the intermediate joint. The buffer member is provided between the intermediate joint and the front joint or the rear joint, and deforms when the front joint or the rear joint rotates relative to the intermediate joint, in a buffer connection device.

[0082] Clause 2, The cushioning connection device according to Clause 1, wherein the rear end of the cushioning member is connected to the third pin shaft, and when the front joint or the rear joint is inverted vertically relative to the intermediate joint, the third pin shaft moves in the front-rear direction, causing the cushioning member to deform or return to its original shape.

[0083] Clause 3, the buffer connection device according to Clause 2, wherein the front end of the buffer member is rotatably connected to the intermediate joint.

[0084] Clause 4, The buffer connection device according to Clause 1, wherein the front of the intermediate joint is provided with a front restraining member having a front restraining surface facing rear, the front joint or the rear joint is provided with a rear restraining member having a rear restraining surface facing forward, at least a portion of the front restraining surface and the rear restraining surface is flat, the buffer member is limited to the space between the front restraining surface and the rear restraining surface and deforms when the front joint or the rear joint rotates relative to the intermediate joint.

[0085] Clause 5, the buffer connection device according to Clause 4, wherein the front end of the buffer member abuts against the front restraining surface, and the rear end of the buffer member abuts against the rear restraining surface.

[0086] Clause 6, The buffer connection device according to Clause 5, wherein, during the process in which the front joint or the rear joint reverses relative to the intermediate joint, the front restraining surface and the rear restraining surface are both parallel to each other.

[0087] Clause 7, the buffer connection device according to Clause 6, wherein the rear restraint member is rotatably mounted on the front joint via a fourth pin shaft, and the rear joint has a contact portion that abuts against the rear side of the rear restraint member, or the rear restraint member is rotatably mounted on the rear joint via a fourth pin shaft, and the front joint has a contact portion that abuts against the rear side of the rear restraint member, and the contact portion is configured such that the rear restraint surface maintains parallelism with the front restraint surface.

[0088] Clause 8, The buffer connection device according to Clause 7, wherein the rear restraint member is suspended from the front joint via the fourth pin shaft, the contact portion has an arc-shaped contact surface projecting forward, and in the process of the front joint or the rear joint reversing relative to the intermediate joint, the rear restraint member and the contact surface slide and engage, so that the rear restraint surface maintains a vertical position.

[0089] Clause 9, the buffer connection device according to Clause 4, wherein a mounting space is enclosed and formed between the intermediate joint and the rear restraint member, the buffer member is provided in and confined within the mounting space, the buffer member is provided along the front-rear direction and is deformable along the front-rear direction, and the buffer member includes a compression spring or a gas spring.

[0090] Clause 10, the buffer connection device according to Clause 4, wherein the front restraining member has a front restraining groove, the front end of the buffer member is located within the front restraining groove, and the rear restraining member has a rear restraining groove, the rear end of the buffer member is located within the rear restraining groove.

[0091] Clause 11, the buffer connection device according to Clause 4, wherein the intermediate joint comprises two side plates and one connecting pipe, the two side plates are spaced apart from each other, the connecting pipe is connected between the upper parts of the two side plates, a first through hole extending vertically is provided on the connecting pipe, the lower end of the seat bracket passes through the through hole, and the first pin shaft is inserted into the connecting pipe and passes through the front joint, the side plates and the lower end of the seat bracket.

[0092] Clause 12, a buffer coupling device according to any of the preceding clauses, wherein the lower end of the intermediate coupling and the lower end of the rear coupling are rotatably connected via the second pin shaft, the lower end of the front coupling and the upper end of the rear coupling are rotatably connected via the third pin shaft, and at least one of the lower end of the front coupling and the upper end of the rear coupling has a shaft hole for engaging with the third pin shaft, the shaft hole being an elongated or arc-shaped hole, and the third pin shaft being slidably inserted into the shaft hole, allowing relative movement between the front coupling and the rear coupling.

[0093] Clause 13, the buffer connection device according to any of the preceding clauses, wherein the rear joint is provided with a pedal tube for mounting a pedal, and the pedal tube is located on the rear side of the second pin shaft.

[0094] Clause 14, the buffer connection device according to either of the preceding clauses, wherein the rear restraint member and the rear joint are fixedly connected or integrally provided, or the rear restraint member and the front joint are fixedly connected or integrally provided.

[0095] Clause 15, A frame comprising a front bracket on which a front wheel is provided, a rear bracket on which a rear wheel is provided, and a seat bracket on which a seat is provided, wherein the front bracket, the rear bracket and the seat bracket are connected via a buffer connection device as described in any one of Clauses 1 to 14.

[0096] Clause 16, the frame according to Clause 15, wherein the rear bracket comprises a rear wheel seat for mounting a rear wheel, an upper link having a front end hinged to the shock absorber connector and a rear end hinged to the rear wheel seat, and a lower link having a front end hinged to the shock absorber connector and a rear end hinged to the rear wheel seat.

[0097] Clause 17, the frame according to Clause 16, wherein the upper link is located above the lower link, the front end of the upper link is hinged to the third pin axis, and the front end of the lower link is hinged to the second pin axis.

[0098] Article 18, A bicycle comprising a frame, wherein the frame comprises a shock-absorbing connector as described in any one of Articles 1 to 14, or a frame as described in any one of Articles 15 to 17.

[0099] Article 19, an electric bicycle comprising a frame and a battery, wherein the frame comprises a front bracket on which a front wheel is mounted, a rear bracket on which a rear wheel is mounted, and a seat bracket on which a seat is mounted, the battery is mounted on the front bracket or the rear bracket, and the frame also comprises a buffer connection device as described in any one of Articles 1 to 14, or a frame as described in any one of Articles 15 to 17.

[0100] Clause 20, a shock absorber frame comprising: a front bracket for mounting a front wheel and steering assembly; a rear bracket for mounting a rear wheel, the rear bracket being movably connected to the rear end of the front bracket via its front end; and a seat bracket for mounting a seat and an elastic shock absorber, the elastic shock absorber being rotatably connected to the seat bracket via its front end, wherein the front bracket and the rear bracket are rotatably connected to the seat bracket via a first pivot and a second pivot, respectively, the first pivot being located above the second pivot, and the front A shock absorber frame wherein at least one of the bracket and the rear bracket is rotatably connected to the rear end of the elastic shock absorber via a third pivot, the third pivot is located between the first pivot and the second pivot, the front end of the elastic shock absorber is located in front of the line connecting the first pivot and the second pivot, the elastic shock absorber has an initial position and a compressed position, when the elastic shock absorber is in the initial position neither the front wheel nor the rear wheel is lifted and the third pivot is in a first position, when the elastic shock absorber is in the compressed position the front wheel and / or the rear wheel is lifted and the third pivot moves forward from the first position to a second position.

[0101] Clause 21, the buffer frame according to Clause 20, wherein the rear end of the front bracket curves downward to form a first curved portion, and the front end of the rear bracket curves upward to form a second curved portion, and the first curved portion is movably connected to the upper end of the second curved portion via its lower end.

[0102] Clause 22, the cushioning frame according to Clause 21, wherein at least one of the first curved portion and the second curved portion is rotatably connected to the rear end of the elastic cushioning member via the third pivot.

[0103] Clause 23, the shock absorber frame according to Clause 21, wherein when the front wheel is lifted, the first curved portion rotates forward around the first pivot, and when the rear wheel is lifted, the second curved portion rotates forward around the second pivot.

[0104] Clause 24, the cushioning frame according to Clause 20, wherein the seat bracket is provided along the vertical direction, the lower part of the seat bracket protrudes forward to form a front projection, and the elastic cushioning member is rotatably connected to the front projection via its front end.

[0105] Clause 25, the buffer frame according to Clause 20, wherein one of the front bracket and the rear bracket is provided with a first circular hole for the third pivot to fit into and pass through, and the other is provided with a first elongated hole for the third pivot to pass through.

[0106] Clause 26, the buffer frame according to Clause 20, wherein one of the front bracket and the rear bracket is provided with a second circular hole through which the third pivot fits and passes, and the two are movably connected via a fourth pivot, one of which is provided with a third circular hole through which the fourth pivot fits and passes, and the other is provided with a second elongated hole through which the fourth pivot passes.

[0107] Clause 27, the cushioning frame according to Clause 20, wherein the elastic expansion and contraction direction of the elastic cushioning member is set along the front-rear horizontal direction.

[0108] Clause 28, the buffer frame according to Clause 27, wherein when the elastic buffer member is in the initial position, the first position of the third pivot is located behind the connecting line between the first pivot and the second pivot, and when the elastic buffer member is in the compressed position, the second position of the third pivot is located in front of the connecting line between the first pivot and the second pivot.

[0109] A bicycle having a shock-absorbing frame as described in Clause 29 or any one of Clauses 20 to 28.

[0110] The above embodiments are for illustrative purposes only, to illustrate the technical ideas and features of the Disclosure, and are intended to enable those skilled in the art to understand and implement the Disclosure, and are not intended to limit the scope of protection of the Disclosure. Any equivalent changes or modifications made based on the spiritual substance of the Disclosure should be included within the scope of protection of the Disclosure. [Explanation of Symbols]

[0111] 1. Front bracket; 11. First curved section; 12. First elongated hole; 2. Front wheel; 3. Steering assembly; 4. Rear bracket; 41. Second curved section; 42. First circular hole; 5. Rear wheel; 6. Seat bracket; 61. Front projection; 7. Elastic cushioning member; 8. First pivot; 9. Second pivot; 10. Third pivot; 100. Front bracket; 101. Front wheel; 102. Steering member; 200. Rear bracket; 201. Rear wheel; 300. Seat bracket; 400. Cushioning connection device; 401. First pin shaft 402, second pin shaft; 403, third pin shaft; 404, fourth pin shaft; 410, front joint; 411, shaft hole; 420, rear joint; 421, rear restraint member; 421a, rear restraint surface; 422, rear restraint groove; 423, pedal tube; 424, contact part; 430, intermediate joint; 431, front restraint member; 431a, front restraint surface; 432, side plate; 433, connecting tube; 434, first through hole; 435, second through hole; 440, cushioning member; 202, upper link; 203, rear wheel seat; 204, lower link

Claims

1. A buffer connection device for the frame, for connecting the front bracket, rear bracket and seat bracket of the frame, The buffer connection device, A front joint for connecting the rear end of the front bracket, A rear joint for connecting the front end of the rear bracket, An intermediate joint for connecting the lower end of the aforementioned seat bracket, A deformable cushioning member is provided, Here, the front joint and the intermediate joint are rotatably connected via a first pin shaft, the intermediate joint and the rear joint are rotatably connected via a second pin shaft, the front joint and the rear joint are movably connected via a third pin shaft, and the configuration allows the front joint or the rear joint to be inverted vertically relative to the intermediate joint. The buffer member is provided between the intermediate joint and the front joint or the rear joint, and is characterized in that it deforms when the front joint or the rear joint rotates relative to the intermediate joint.

2. The rear end of the cushioning member is connected to the third pin shaft, and the cushioning member deforms or returns to its original shape when the front joint or the rear joint is inverted vertically relative to the intermediate joint, as the third pin shaft moves in the front-rear direction. This is the cushioning connection device according to claim 1.

3. The buffer connection device according to claim 2, characterized in that the front end of the buffer member is rotatably connected to the intermediate joint.

4. The buffer connection device according to claim 1, characterized in that a front restraining member having a rearward-facing front restraining surface is provided at the front of the intermediate joint, a rear restraining member having a forward-facing rear restraining surface is provided at the front of the intermediate joint, at least a portion of the front restraining surface and the rear restraining surface are planar, the buffer member is confined between the front restraining surface and the rear restraining surface and deforms when the front joint or the rear joint rotates relative to the intermediate joint.

5. The buffer connection device according to claim 4, characterized in that the front end of the buffer member abuts against the front restraining surface, and the rear end of the buffer member abuts against the rear restraining surface.

6. The buffer connection device according to claim 5, characterized in that, during the process in which the front joint or the rear joint reverses relative to the intermediate joint, the front restraining surface and the rear restraining surface are both parallel to each other.

7. The rear restraining member is rotatably mounted on the front joint via a fourth pin shaft, and the rear joint has a contact portion that abuts against the rear side of the rear restraining member, or the rear restraining member is rotatably mounted on the rear joint via a fourth pin shaft, and the front joint has a contact portion that abuts against the rear side of the rear restraining member. The buffer connection device according to claim 6, characterized in that the contact portion is configured such that the rear restraining surface maintains parallelism with the front restraining surface.

8. The buffer connection device according to claim 7, characterized in that the rear restraining member is suspended from the front joint via the fourth pin shaft, the contact portion has an arc-shaped contact surface that protrudes forward, and in the process of the front joint or the rear joint reversing relative to the intermediate joint, the rear restraining member and the contact surface slide and engage, so that the rear restraining surface maintains a vertical position.

9. The buffer connection device according to claim 4, wherein a mounting space is enclosed and formed between the intermediate joint and the rear restraining member, the buffer member is provided in and confined within the mounting space, the buffer member is provided along the front-rear direction and is deformable along the front-rear direction, and the buffer member includes a compression spring or a gas spring.

10. The buffer connection device according to claim 4, characterized in that the front restraining member has a front restraining groove, the front end of the buffer member is located within the front restraining groove, and the rear restraining member has a rear restraining groove, the rear end of the buffer member is located within the rear restraining groove.

11. The buffer connection device according to claim 4, wherein the intermediate joint comprises two side plates and one connecting pipe, the two side plates are spaced apart from each other on the left and right, the connecting pipe is connected between the upper parts of the two side plates, a first through hole extending in the vertical direction is provided on the connecting pipe, the lower end of the seat bracket passes through the through hole, the first pin shaft is inserted into the connecting pipe and passes through the front joint, the side plates and the lower end of the seat bracket.

12. The buffer connection device according to any of the above claims, characterized in that the lower end of the intermediate joint and the lower end of the rear joint are rotatably connected via the second pin shaft, the lower end of the front joint and the upper end of the rear joint are rotatably connected via the third pin shaft, and at least one of the lower end of the front joint and the upper end of the rear joint has a shaft hole that engages with the third pin shaft, the shaft hole is an elongated hole or an arc-shaped hole, the third pin shaft is slidably inserted into the shaft hole, and relative movement of the front joint and the rear joint is permitted.

13. The buffer connection device according to any of the above claims, characterized in that the rear joint is provided with a pedal tube for attaching a pedal, and the pedal tube is located on the rear side of the second pin shaft.

14. The buffer connection device according to any of the above claims, characterized in that the rear restraining member and the rear joint are fixedly connected or provided integrally, or the rear restraining member and the front joint are fixedly connected or provided integrally.

15. A frame comprising a front bracket on which a front wheel is provided, a rear bracket on which a rear wheel is provided, and a seat bracket on which a seat is provided, wherein the front bracket, the rear bracket and the seat bracket are connected via a buffer connection device as described in any one of claims 1 to 14.

16. The aforementioned rear bracket is A rear wheel seat for attaching the rear wheel, An upper link having a front end hinged to the buffer connection device and a rear end hinged to the rear wheel seat, The frame according to claim 15, further comprising a lower link having a front end hinged to the buffer connection device and a rear end hinged to the rear wheel seat.

17. The frame according to claim 16, characterized in that the upper link is located above the lower link, the front end of the upper link is hinged to the third pin shaft, and the front end of the lower link is hinged to the second pin shaft.

18. A bicycle comprising a frame, wherein the frame comprises a buffer connection device according to any one of claims 1 to 14, or a frame according to any one of claims 15 to 17.

19. An electric bicycle comprising a frame and a battery, wherein the frame comprises a front bracket on which a front wheel is provided, a rear bracket on which a rear wheel is provided, and a seat bracket on which a seat is provided, the battery is provided on the front bracket or the rear bracket, and the frame further comprises a buffer connection device as described in any one of claims 1 to 14, or a frame as described in any one of claims 15 to 17.

20. It is a cushioning frame, A front bracket for mounting the front wheel and steering assembly, A rear bracket for mounting a rear wheel, wherein the rear bracket is movably connected to the rear end of the front bracket via its front end, A seat bracket for attaching a seat and an elastic cushioning member, wherein the elastic cushioning member is rotatably connected to the seat bracket via its front end, and comprises a seat bracket. The front bracket and the rear bracket are rotatably connected to the seat bracket via a first pivot and a second pivot, respectively, with the first pivot located above the second pivot. At least one of the front bracket and the rear bracket is rotatably connected to the rear end of the elastic cushioning member via a third pivot, the third pivot is located between the first pivot and the second pivot, and the front end of the elastic cushioning member is located in front of the connecting line between the first pivot and the second pivot. The elastic cushioning member has an initial position and a compressed position. When the elastic cushioning member is in the initial position, neither the front wheel nor the rear wheel is lifted, and the third pivot is in the first position. A shock-absorbing frame characterized in that when the elastic shock-absorbing member is in the compression position, the front wheel and / or the rear wheel are lifted, and the third pivot moves forward from the first position to the second position.

21. The buffer frame according to claim 20, characterized in that the rear end of the front bracket curves downward to form a first curved portion, the front end of the rear bracket curves upward to form a second curved portion, and the first curved portion is movably connected to the upper end of the second curved portion via its lower end.

22. The cushioning frame according to claim 21, characterized in that at least one of the first curved portion and the second curved portion is rotatably connected to the rear end of the elastic cushioning member via the third pivot.

23. The cushioning frame according to claim 21, characterized in that when the front wheel is lifted, the first curved portion rotates forward around the first pivot, and when the rear wheel is lifted, the second curved portion rotates forward around the second pivot.

24. The cushioning frame according to claim 20, characterized in that the seat bracket is provided along the vertical direction, the lower part of the seat bracket protrudes forward to form a front projection, and the elastic cushioning member is rotatably connected to the front projection via its front end.

25. The buffer frame according to claim 20, characterized in that one of the front bracket and the rear bracket is provided with a first circular hole through which the third pivot is fitted and passes, and the other is provided with a first elongated hole through which the third pivot is passed.

26. The buffer frame according to claim 20, characterized in that one of the front bracket and the rear bracket is provided with a second circular hole through which the third pivot fits and passes, and the two are movably connected via a fourth pivot, one of which is provided with a third circular hole through which the fourth pivot fits and passes, and the other is provided with a second elongated hole through which the fourth pivot passes.

27. The cushioning frame according to claim 20, characterized in that the elastic expansion and contraction direction of the elastic cushioning member is set along the front-rear horizontal direction.

28. The cushioning frame according to claim 27, characterized in that when the elastic cushioning member is in the initial position, the first position of the third pivot is located behind the connecting line between the first pivot and the second pivot, and when the elastic cushioning member is in the compressed position, the second position of the third pivot is located in front of the connecting line between the first pivot and the second pivot.

29. A bicycle characterized by comprising a shock-absorbing frame according to any one of claims 20 to 28.

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