Bicycle frame

Abstract

The utility model relates to a bicycle frame, this bicycle frame includes frame main part, fork assembly, connecting rod subassembly and shock absorbing subassembly. Frame main part surrounds and enclose a vacancy area, one end of fork assembly rotatory connection frame main part, and the other end is equipped with the interval setting two connecting arms, connecting rod subassembly is located in the vacancy area and rotatory connection frame main part, and connecting rod subassembly still is located between two connecting arms and rotatory connection at least one connecting arm, shock absorbing subassembly rotatory setting in frame main part and its telescopic end swing joint connecting rod subassembly. The utility model discloses through the built-in vacancy area of connecting rod subassembly and by the projection of frame main part and connecting arm on vertical and horizontal direction cover, realized hidden type layout. Adopted the double connecting rod system that fork connecting rod and shock absorbing connecting rod constitute, cooperate the triangle containing cavity of opening in frame main part and the avoidance groove and the occupation boss on connecting arm, effectively promoted compact structure, shock absorbing efficiency and motion stability, reduced the component wear and tear risk simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of bicycle frame structure technology, and in particular to a bicycle frame. Background Technology

[0002] In related technologies, bicycle frame rear suspension systems typically employ external linkage assemblies. This design exposes the linkage assembly to the outside of the frame, affecting not only the overall aesthetics and limiting compact frame design, but also making it prone to accumulating dust and dirt, accelerating component wear. Furthermore, the external linkage assembly is susceptible to collisions with external objects during riding, posing a risk of damage. In addition, existing suspension systems have relatively long force transmission paths, resulting in lower shock absorption efficiency, and the connection rigidity between the rear fork assembly and the frame body is insufficient, making them prone to lateral instability under complex road conditions. Utility Model Content

[0003] This invention provides a bicycle frame that enables a concealed layout of the linkage assembly, thereby solving the problem that existing linkage assemblies are easily affected by external environmental pollution and physical impacts.

[0004] This utility model provides a bicycle frame, comprising:

[0005] The main frame of the vehicle is used to enclose an empty area;

[0006] A rear fork assembly, one end of which is rotatably connected to the frame body, and the other end of which has two spaced-apart connecting arms, with the frame body located between the two connecting arms;

[0007] Linkage assembly, the linkage assembly being located within the vacant area and rotatably connected to the vehicle frame body, the linkage assembly also being located between the two connecting arms and rotatably connected to at least one of the connecting arms; and

[0008] The shock absorber assembly is rotatably mounted on the main body of the vehicle frame, and the telescopic end of the shock absorber assembly is movably connected to the linkage assembly.

[0009] Furthermore, the projected area of ​​the frame body in the vertical direction completely or partially covers the projected area of ​​the linkage assembly in the vertical direction;

[0010] The projected area of ​​the connecting arm in the horizontal direction completely or partially covers the projected area of ​​the connecting rod assembly in the horizontal direction.

[0011] Furthermore, the rear fork assembly includes a rear upper fork and a rear lower fork;

[0012] The upper rear fork includes two connecting arms, one end of the lower rear fork is rotatably connected to the frame body, and the other end of the lower rear fork is connected to the two connecting arms respectively.

[0013] Furthermore, the linkage assembly includes a rear fork linkage and a shock absorber linkage;

[0014] The rear fork link includes a frame connecting end and two rear fork fixing ends. The frame connecting end is rotatably connected to the frame body, and the two rear fork fixing ends are rotatably connected to the two connecting arms in a one-to-one correspondence, with the two rear fork fixing ends located between the two connecting arms.

[0015] The shock absorber linkage includes a shock absorber connecting end and two rear fork linkage ends. The shock absorber connecting end is movably connected to the telescopic end of the shock absorber assembly. The two rear fork linkage ends are rotatably connected to the two connecting arms in a one-to-one correspondence, and the two rear fork linkage ends are located between the two connecting arms.

[0016] Furthermore, each of the connecting arms is provided with a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being spaced apart;

[0017] The two first connecting parts are rotatably connected to the two fixed ends of the rear fork, and the two second connecting parts are rotatably connected to the two linkage ends of the rear fork.

[0018] Furthermore, the first connecting part is adapted to the outer surface of the fixed end of the rear fork, and the second connecting part is adapted to the outer surface of the linkage end of the rear fork.

[0019] Furthermore, each of the first connecting portions is provided with a clearance groove, and each clearance groove is provided with a first connecting hole. The two rear fork fixing ends are rotatably connected to the two first connecting holes one-to-one, and at least a portion of each rear fork fixing end is located within the clearance groove; and / or

[0020] Each of the second connecting parts is provided with a locating boss, and each locating boss is provided with a second connecting hole. The two rear fork linkage ends are rotatably connected to the two second connecting holes in a one-to-one correspondence. The size of the interval between the two locating bosses is adapted to the shape of the shock absorber link.

[0021] Furthermore, the main body of the frame has a receiving cavity, the opening of the receiving cavity faces the empty area, the frame connecting end is rotatably connected to the receiving cavity, and the projected area of ​​the receiving cavity in the horizontal direction is greater than the maximum projected area of ​​the frame connecting end in the horizontal direction.

[0022] Furthermore, the frame body includes an upper tube, a middle tube, and a lower tube, which together form the empty area; the shock absorber assembly is rotatably mounted on the bottom of the upper tube, and the bottom of the upper tube also has a receiving cavity, the opening of which is exposed in the empty area; the connecting rod assembly is rotatably connected to the receiving cavity, and the middle tube is located between the two connecting arms.

[0023] Furthermore, the accommodating cavity is a triangular cavity whose inner wall contour is adapted to the movement trajectory of the connecting end of the frame.

[0024] The following are the beneficial effects of implementing this utility model:

[0025] This utility model relates to a bicycle frame, including a frame body, a rear fork assembly, a connecting rod assembly, and a shock absorber assembly. By embedding the connecting rod assembly within the empty area enclosed by the frame body, and utilizing the projection area coverage relationship between the frame body and the connecting arm in the vertical and horizontal directions, a concealed layout of the connecting rod assembly is achieved. This not only significantly improves the structural compactness and aesthetics of the frame, but also effectively prevents the connecting rod assembly from being contaminated or impacted by the external environment through the protective space formed by the frame body and the connecting arm. At the same time, the dual-link system composed of the rear fork connecting rod and the shock absorber connecting rod, in conjunction with the triangular cavity, further optimizes the utilization of the internal space of the frame while ensuring shock absorption performance, thereby improving the overall structural stability and durability. Attached Figure Description

[0026] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0027] Figure 1 This is a three-dimensional structural diagram of the bicycle frame of this utility model;

[0028] Figure 2 This is a side view of the bicycle frame structure of this utility model;

[0029] Figure 3 This is a top view of the bicycle frame structure of this utility model;

[0030] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure along the AA direction in the illustrated embodiment;

[0031] Figure 5 This is a schematic diagram of the connection structure of the rear fork assembly, connecting rod assembly, and shock absorber assembly of the bicycle frame of this utility model;

[0032] Figure 6This is a three-dimensional structural diagram of the rear fork assembly of the bicycle frame according to this utility model;

[0033] Figure 7 This is a three-dimensional structural diagram of the rear fork linkage of the bicycle frame according to this utility model;

[0034] Figure 8 This is a three-dimensional structural diagram of the shock-absorbing linkage of the bicycle frame according to this utility model. Detailed Implementation

[0035] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0036] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] Figures 1 to 4 The bicycle frame 10 of some embodiments of the present invention is shown. The bicycle frame 10 includes a frame body 1, a rear fork assembly 2, a connecting rod assembly 3, and a shock absorption assembly 4.

[0040] like Figures 1 to 2 As shown, the frame body 1 encloses an empty area 101; one end of the rear fork assembly 2 is rotatably connected to the frame body 1, and the other end of the rear fork assembly 2 has two spaced-apart connecting arms 21a, with the frame body 1 located between the two connecting arms 21a; the linkage assembly 3 is located within the empty area 101 and rotatably connected to the frame body 1, and the linkage assembly 3 is also located between the two connecting arms 21a and rotatably connected to at least one connecting arm 21a; the shock absorber assembly 4 is rotatably mounted on the frame body 1, and the telescopic end of the shock absorber assembly 4 is movably connected to the linkage assembly 3.

[0041] Understandably, the empty area 101 enclosed by the frame body 1 provides a storage space. By accommodating the linkage assembly 3 within this empty area 101, the number of protruding parts on the bicycle frame 10 is reduced, improving the overall structural compactness of the bicycle frame 10. The rear fork assembly 2 is used to mount the rear wheel and transmit riding load. The swivel connection design of the rear fork assembly 2 allows the rear wheel to move relative to the frame body 1 when it encounters an impact. The two spaced connecting arms 21a, symmetrically distributed on both sides of the frame body 1, form a stable support structure, enhancing the connection rigidity between the rear fork assembly 2 and the frame body 1, ensuring the stability of the rear wheel installation, and preventing lateral instability. The linkage assembly 3 is used to transmit the motion of the rear fork assembly 2 to the shock absorber assembly 4, realizing motion conversion. The shock absorber assembly 4 is used to provide variable damping force to absorb impact energy during riding and improve comfort.

[0042] It should be noted that the linkage assembly 3 can be configured to be rotatably connected to only one connecting arm 21a or rotatably connected to both connecting arms 21a simultaneously. Specifically, when the linkage assembly 3 is connected to only one connecting arm 21a, the linkage assembly 3 establishes a kinematic association with the rear fork assembly 2 through a single connection point, while the other connecting arm 21a is supported by other structures, resulting in a relatively simplified structure and effectively reducing manufacturing complexity. When the linkage assembly 3 is connected to two connecting arms 21a, the linkage assembly 3 establishes a kinematic association with the rear fork assembly 2 through two symmetrical connection points, forming a stable double-sided support structure. This makes the force transmission path more balanced, effectively avoiding the off-center load problem caused by unilateral force, and improving motion stability and structural reliability.

[0043] It should also be noted that the telescopic end of the shock absorber assembly 4 can be movably connected to the connecting rod assembly 3 via a ball joint or pin connection, thereby allowing for relative motion freedom between the telescopic end of the shock absorber assembly 4 and the connecting rod assembly 3 in multiple directions. This accommodates the complex trajectory changes of the connecting rod assembly 3 during movement, ensuring smooth transmission of shock-absorbing force and avoiding motion interference. This embodiment, by employing a movable connection, allows the shock absorber assembly 4 to extend and retract with the movement of the connecting rod assembly 3, ensuring uniform distribution of shock-absorbing force.

[0044] In this embodiment, the connecting rod assembly 3 is built into the empty area 101 of the frame body 1 and positioned between the two connecting arms 21a at the end of the rear fork assembly 2. This allows the frame body 1 and the rear fork assembly 2 to conceal the connecting rod assembly 3, achieving a hidden layout that effectively improves the aesthetics of the frame. By adopting a hidden layout for the connecting rod assembly 3, interference from mud, dust, and other debris at the rotational connection points of the connecting rod assembly 3 can be effectively prevented, improving transmission efficiency and component lifespan. Furthermore, it significantly reduces the risk of the connecting rod assembly 3 accidentally snagging or colliding with external objects during riding, enhancing safety and reliability.

[0045] like Figure 3 As shown, in some embodiments of the bicycle frame 10, the projected area of ​​the frame body 1 in the vertical direction completely or partially covers the projected area of ​​the link assembly 3 in the vertical direction.

[0046] like Figure 2 As shown, in some embodiments of the bicycle frame 10, the projected area of ​​the connecting arm 21a in the horizontal direction completely or partially covers the projected area of ​​the link assembly 3 in the horizontal direction.

[0047] It should be noted that in the orientation description of this embodiment, "vertical direction" refers to the direction perpendicular to the ground when the bicycle frame 10 is in a normal standing state, and "horizontal direction" refers to the direction parallel to the ground when the bicycle frame 10 is in a normal standing state.

[0048] When the vertical projection area of ​​the frame body 1 completely covers the vertical projection area of ​​the link assembly 3, the projection outline of the frame body 1 completely includes the projection outline of the link assembly 3, so that the link assembly 3 is completely concealed in the vertical direction, achieving maximum structural integration and a simple appearance. When the vertical projection area of ​​the frame body 1 partially covers the vertical projection area of ​​the link assembly 3, there is an overlapping area between the projection outline of the frame body 1 and the projection outline of the link assembly 3, but some areas of the link assembly 3 are still visible in the vertical direction, so as to provide the necessary operating space for the maintenance and repair of the link assembly 3 while maintaining structural compactness.

[0049] When the projected area of ​​the connecting arm 21a in the horizontal direction completely covers the projected area of ​​the link assembly 3 in the horizontal direction, the projected contours of the two connecting arms 21a in the horizontal direction completely encompass the projected contour of the link assembly 3 located between them, so as to provide comprehensive lateral protection for the link assembly 3 through the connecting arms 21a and effectively prevent lateral impacts; when the projected area of ​​the connecting arm 21a in the horizontal direction partially covers the projected area of ​​the link assembly 3 in the horizontal direction, the projected contours of the connecting arm 21a and the projected contours of the link assembly 3 overlap, but a part of the link assembly 3 is exposed in the horizontal direction between the connecting arms 21a, so as to reduce the overall weight of the bicycle frame 10 while ensuring basic lateral protection.

[0050] Understandably, the coverage relationship of the projected area is achieved by the frame body 1 and the connecting arm 21a forming a spatial shield for the link assembly 3, so that the link assembly 3 is effectively housed within the protective space formed by the frame body 1 and the connecting arm 21a, achieving a compact structural layout, ensuring that the link assembly 3 is hidden inside the frame, and by reducing the external exposure of the link assembly 3, the risk of it being contaminated, corroded or accidentally impacted in complex usage environments is effectively reduced, thereby improving the durability and reliability of the entire bicycle frame 10.

[0051] like Figures 1 to 2 As shown, in some embodiments of the bicycle frame 10, the rear fork assembly 2 includes a rear upper fork 21 and a rear lower fork 22; the rear upper fork 21 includes two connecting arms 21a, one end of the rear lower fork 22 is rotatably connected to the frame body 1, and the other end of the rear lower fork 22 is respectively connected to the two connecting arms 21a.

[0052] It should be noted that the rear upper fork 21 includes two connecting arms 21a. Specifically, the two connecting arms 21a are spaced apart and symmetrically distributed on both sides of the frame body 1. The two connecting arms 21a are used to provide two symmetrical and stable rotational connection interfaces for the linkage assembly 3, ensuring the balanced transmission of force on the left and right sides of the frame body 1, and effectively preventing torsional deformation caused by unilateral force.

[0053] It should also be noted that one end of the chainstay 22 can be rotatably connected to the frame body 1 via a bearing, bushing, or pivot, thus forming a pivot point for the rear fork assembly 2 relative to the frame body 1. This allows the rear fork assembly 2 to rotate around this pivot point when impacted by the rear wheel, providing a basic degree of freedom for the operation of the shock absorption system. The other end of the chainstay 22 is connected to two connecting arms 21a. Specifically, the other end of the chainstay 22 can be fixedly connected to the two connecting arms 21a by welding, bolting, or integral molding. This allows the rear upper fork 21 and the chainstay 22 to jointly form a stable triangular frame structure through this connection point, which supports the installation of the rear wheel and significantly enhances the overall structural stability of the bicycle frame 10.

[0054] Understandably, the upper rear fork 21 provides a symmetrical connection interface with the linkage assembly 3, and the lower rear fork 22 forms a stable triangular support structure to effectively distribute the load borne by the rear wheel to the frame body 1 during riding. The combination of the upper rear fork 21 and the lower rear fork 22 enhances the stability and rigidity of the rear wheel installation, enabling the rear fork assembly 2 to achieve efficient and smooth force distribution and motion response through a precisely designed force transmission path when dealing with impacts from different road conditions. This significantly improves the riding stability and durability of the bicycle frame 10.

[0055] like Figure 5 As shown, in some embodiments of the bicycle frame 10, the linkage assembly 3 includes a rear fork linkage 31 and a shock absorber linkage 32.

[0056] like Figure 7 As shown, in some embodiments of the bicycle frame 10, the rear fork link 31 includes a frame connecting end 311 and two rear fork fixing ends 312. For example... Figure 4 , Figure 5 As shown, the frame connecting end 311 is rotatably connected to the frame body 1, and the two rear fork fixing ends 312 are rotatably connected to the two connecting arms 21a in a one-to-one correspondence, with the two rear fork fixing ends 312 located between the two connecting arms 21a.

[0057] Specifically, the frame connecting end 311 is rotatably connected to the frame body 1 via a pivot or bearing assembly to form the main rotation fulcrum of the link assembly 3 relative to the frame body 1, thereby establishing a stable connection with the frame body 1 and bearing the main force from the rear fork assembly 2; the two rear fork fixed ends 312 are rotatably connected to the two connecting arms 21a via pins or spherical bearings, so that the rear fork link 31 can dynamically connect the frame body 1 and the rear fork assembly 2, and symmetrically transmit the impact force from the rear fork assembly 2 to the frame body 1, effectively avoiding the imbalance caused by unilateral force.

[0058] like Figure 8As shown, in some embodiments of the bicycle frame 10, the shock absorber link 32 includes a shock absorber connection end 321 and two rear fork linkage ends 322, such as... Figure 5 As shown, the shock absorber connection end 321 is movably connected to the telescopic end of the shock absorber assembly 4, and the two rear fork linkage ends 322 are rotatably connected to the two connecting arms 21a in a one-to-one correspondence, with the two rear fork linkage ends 322 located between the two connecting arms 21a.

[0059] Specifically, the shock absorber connection end 321 is movably connected to the telescopic end of the shock absorber assembly 4 via a ball joint or pin, so that there is relative movement between the shock absorber link 32 and the shock absorber assembly 4 in multiple directions, ensuring smooth transmission of shock absorber force; the two rear fork linkage ends 322 are rotatably connected to the two connecting arms 21a via pins or spherical bearings, so that the shock absorber link 32 can evenly transmit the damping force generated by the shock absorber assembly 4 to both sides of the rear fork assembly 2, forming a stable force control loop.

[0060] Understandably, the rear fork link 31 is used to dynamically connect the frame body 1 and the rear fork assembly 2 to achieve symmetrical force transmission; the shock absorber link 32 is used to transmit the damping force of the shock absorber assembly 4 to the rear fork assembly 2, forming a multi-stage motion transmission mechanism. The rear fork link 31 and the shock absorber link 32 together constitute a double-link motion system. When the rear fork assembly 2 is impacted and moves, the rear fork link 31, as the first-stage lever, transmits the motion to the shock absorber link 32. The shock absorber link 32, as the second-stage lever, further transmits and amplifies the motion before acting on the shock absorber assembly 4, effectively improving the response sensitivity of the shock absorber assembly 4 and achieving superior shock absorption performance and riding comfort.

[0061] like Figure 6 As shown, in some embodiments of the bicycle frame 10, each connecting arm 21a is provided with a first connecting part 211 and a second connecting part 212, and the first connecting part 211 and the second connecting part 212 are spaced apart.

[0062] It should be noted that the first connecting part 211 and the second connecting part 212 are spaced apart on each connecting arm 21a. This spacing means that the first connecting part 211 and the second connecting part 212 maintain a certain distance in the longitudinal direction or a specific direction of the connecting arm 21a, and the two are not in the same position. This kind of spacing arrangement on the two connecting arms 21a forms two sets of corresponding and independent connection points, providing a separate and clear installation base for the rear fork link 31 and the shock absorber link 32, ensuring the independence and coordination of their movement trajectories.

[0063] like Figure 5As shown, in some embodiments of the bicycle frame 10, two first connecting parts 211 are rotatably connected to two rear fork fixing ends 312 in a one-to-one correspondence. Specifically, the first connecting part 211 on the left connecting arm 21a is rotatably connected to the rear fork fixing end 312 on the left side of the rear fork link 31, and the first connecting part 211 on the right connecting arm 21a is rotatably connected to the rear fork fixing end 312 on the right side of the rear fork link 31. This allows the rear fork link 31 to be stably positioned horizontally between the two connecting arms 21a and provides a precise axis of rotation for the rear fork link 31, ensuring the accuracy and stability of force transmission between the rear fork link 31 and the rear fork assembly 2.

[0064] like Figure 5 As shown, in some embodiments of the bicycle frame 10, two second connecting parts 212 are rotatably connected to two rear fork linkage ends 322 in a one-to-one correspondence. Specifically, the second connecting part 212 on the left connecting arm 21a is rotatably connected to the rear fork linkage end 322 on the left side of the shock absorber link 32, and the second connecting part 212 on the right connecting arm 21a is rotatably connected to the rear fork linkage end 322 on the right side of the shock absorber link 32. This allows the shock absorber link 32 to be arranged parallel to the rear fork link 31 between the two connecting arms 21a, and provides the shock absorber link 32 with an independent and precise axis of rotation, ensuring that the shock absorption force can be evenly applied to both sides of the rear fork assembly 2.

[0065] Understandably, the first connecting part 211 provides a pivot point for the fixed end 312 of the rear fork, and the second connecting part 212 ensures coordinated movement between the shock absorber link 32 and the rear fork assembly 2. Through the spaced arrangement of the first connecting part 211 and the second connecting part 212, and their corresponding connections to the rear fork link 31 and the shock absorber link 32, the rear fork link 31 and the shock absorber link 32 can move around their respective independent axes, achieving coordinated transmission of motion among multiple components. This effectively improves the response accuracy and efficiency of the shock absorber assembly 4 to different road conditions, and enhances the overall rigidity and operational stability of the frame.

[0066] like Figure 5 As shown, in some embodiments of the bicycle frame 10, the first connecting part 211 is adapted to the outer surface of the rear fork fixing end 312; the second connecting part 212 is adapted to the outer surface of the rear fork linkage end 322.

[0067] It should be noted that the surface shapes of the first connecting part 211 and the corresponding connecting part of the rear fork fixing end 312 are matched, which greatly eliminates the fitting gap between the rear fork fixing end 312 and the first connecting part 211, improves the tightness of the fit, and provides a stable rotation axis for the rotatable connection; the surface shapes of the second connecting part 212 and the corresponding connecting part of the rear fork linkage end 322 are matched, thereby optimizing the fit relationship of the rotatable connection.

[0068] Understandably, the design that adapts the outer surfaces of the rear fork assembly 2 and the connecting rod assembly 3 is achieved by optimizing the shape of the contacting surfaces. This reduces assembly gaps and movement caused by shape mismatch at the connection point between the rear fork assembly 2 and the connecting rod assembly 3, avoids local stress concentration at the connection point due to loose connection, ensures smooth and unobstructed rotation of the rear fork assembly 2 and the connecting rod assembly 3, effectively delays fatigue damage to each component, and significantly improves the service life and reliability of the bicycle frame 10.

[0069] like Figure 6 As shown, in some embodiments of the bicycle frame 10, each first connecting portion 211 is provided with a clearance groove 2111, and each clearance groove 2111 is provided with a first connecting hole 2112. For example... Figure 5 As shown, the two rear fork fixing ends 312 are rotatably connected to the two first connecting holes 2112 in a one-to-one correspondence, and at least part of each rear fork fixing end 312 is located in the clearance groove 2111.

[0070] It should be noted that the clearance groove 2111 is formed on the first connecting part 211. In this embodiment, since there are two connecting arms 21a, there are corresponding two first connecting parts 211. Each of these two first connecting parts 211 is provided with a clearance groove 2111 to ensure that the connection conditions at both ends of the rear fork connecting rod 31 are consistent and to ensure symmetrical force transmission. Specifically, the clearance groove 2111 is set as a recessed structure, and its contour matches the surface shape of the rear fork fixed end 312.

[0071] It should also be noted that the first connecting hole 2112 is formed within the recessed groove 2111. Specifically, the first connecting hole 2112 is used to pass through a pin or bearing to achieve a rotatable connection with the rear fork fixed end 312. In this embodiment, the rear fork fixed end 312 on the left side of the rear fork link 31 is connected to the first connecting hole 2112 on the left connecting arm 21a, and the rear fork fixed end 312 on the right side is connected to the first connecting hole 2112 on the right connecting arm 21a, thus forming the basis of a stable and symmetrical linkage mechanism, avoiding motion interference and uneven force distribution that may be caused by cross connections or unilateral connections; by integrating the first connecting hole 2112 into the recessed groove 2111, the axis of the rotatable connection is precisely positioned within the accommodating space provided by the recessed groove 2111, ensuring the rationality of the force transmission path.

[0072] Understandably, the recessed groove 2111 is used to accommodate and partially enclose the rear fork fixing end 312, thereby limiting the range of movement of the rear fork fixing end 312 in a plane perpendicular to the rotation axis, effectively preventing unintended movement interference between the rear fork link 31 and the first connecting part 211 or other peripheral components during movement. In one embodiment, the rear fork fixing end 312 can be completely accommodated within the depth range of the recessed groove 2111, achieving maximum enclosure and protection; in another embodiment, the main part of the rear fork fixing end 312 is located within the recessed groove 2111, but its end or part may protrude from the opening plane of the recessed groove 2111, ensuring that the recessed groove 2111 can play the necessary limiting and anti-interference role, while also providing flexibility for different structural designs and process requirements.

[0073] like Figure 6 As shown, in some embodiments of the bicycle frame 10, each second connecting portion 212 is provided with a spacer boss 2121, and each spacer boss 2121 is provided with a second connecting hole 2122. For example... Figure 5 As shown, the two rear fork linkage ends 322 are rotatably connected to the two second connecting holes 2122 in a one-to-one correspondence, and the size of the gap between the two occupier bosses 2121 is adapted to the shape of the shock absorber link 32.

[0074] It should be noted that the occupant boss 2121 is provided on the second connecting portion 212. Specifically, the occupant boss 2121 is a protruding structure that extends from the surface of the second connecting portion 212 into the space between the two connecting arms 21a. Understandably, the occupant boss 2121 is used to position the shock-absorbing link 32 in order to fill part of the space between the connecting arm 21a and the shock-absorbing link 32, thereby restricting the movement of the shock-absorbing link 32 along its rotation axis and ensuring that the shock-absorbing link 32 moves within a preset plane, avoiding deviation.

[0075] It should also be noted that the spacing between the two occupant bosses 2121 is designed and determined based on the shape and size of the corresponding connecting parts of the shock absorber link 32. In one embodiment, the spacing between the two occupant bosses 2121 is equal to the spacing between the two rear fork linkage ends 322 of the shock absorber link 32, forming a sliding fit or a small clearance fit to provide precise axial positioning. In another embodiment, the spacing between the two occupant bosses 2121 is slightly larger than the spacing between the two rear fork linkage ends 322 of the shock absorber link 32, so that the shock absorber link 32 can be precisely accommodated between the two occupant bosses 2121, thereby providing the necessary space for the rotation of the shock absorber link 32, enhancing the overall rigidity and stability of the connection while ensuring freedom of movement.

[0076] Understandably, the recessed groove 2111 provides space for the fixed end 312 of the rear fork to prevent motion interference; the occupant boss 2121 positions and supports the linkage end 322 of the rear fork to prevent linkage misalignment. The combination of the recessed groove 2111 and the occupant boss 2121 constrains and optimizes the movement of the linkage assembly 3, improving the compactness of the connection and the reliability of the movement between the rear fork assembly 2 and the linkage assembly 3, and effectively ensuring the stable performance of the bicycle frame 10 under various road conditions.

[0077] like Figure 4 As shown, in some embodiments of the bicycle frame 10, the frame body 1 has a receiving cavity 102, the opening of the receiving cavity 102 faces the empty area 101, the frame connecting end 311 is rotatably connected to the receiving cavity 102, and the projected area of ​​the receiving cavity 102 in the horizontal direction is greater than the maximum projected area of ​​the frame connecting end 311 in the horizontal direction.

[0078] It should be noted that the receiving cavity 102 is a cavity structure formed by an inward recess from the inner wall of the frame body 1 facing the empty area 101. This allows the connecting rod assembly 3 to be smoothly inserted into the receiving cavity 102 from the empty area 101. By housing the connecting rod assembly 3 within the receiving cavity 102, the entire or part of the connecting rod assembly 3 can be housed within it, thus preventing the connecting rod assembly 3 from being directly exposed to the outside. Consequently, the connecting rod assembly 3 is effectively and reliably shielded and protected whether viewed from the top or side of the bicycle. In this way, not only is the connecting rod assembly 3 protected, but the problem of poor aesthetics caused by the direct exposure of the connecting rod assembly 3 is also avoided.

[0079] It should also be noted that, in one embodiment, the frame connection end 311 can be rotatably connected to the receiving cavity 102 via a pivot penetrating both sides of the receiving cavity 102; in another embodiment, the frame connection end 311 can also be rotatably connected to the receiving cavity 102 via a bearing seat and bearing assembly disposed within the receiving cavity 102. This embodiment, by embedding the rotating connection point of the frame connection end 311 within the receiving cavity 102, reduces the exposed area of ​​the connecting rod assembly 3, effectively preventing contamination of the connecting rod assembly 3 by external mud and rainwater, and preventing accidental bumps or scratches to the connecting rod assembly 3 during riding, significantly reducing the failure rate and wear rate of the connecting rod assembly 3, and extending its service life.

[0080] Furthermore, the accommodating cavity 102 allows the frame connecting end 311 to rotate freely. When viewed from the opening direction of the accommodating cavity 102, the area enclosed by the opening outline of the accommodating cavity 102 on the horizontal plane is always greater than the maximum value of the projected area of ​​the frame connecting end 311 on the horizontal plane. This ensures that the frame connecting end 311 will not interfere with the inner wall of the accommodating cavity 102 when it rotates, effectively reducing friction and wear.

[0081] Understandably, the accommodating cavity 102 is used to provide a sheltered space to protect the frame connection end 311 from the influence of the external environment, while at the same time providing sufficient space for movement to ensure that the frame connection end 311 rotates smoothly and without restriction.

[0082] like Figure 1 , Figure 2 As shown, in some embodiments of the bicycle frame 10, the frame body 1 includes a top tube 11, a middle tube 12, and a bottom tube 13, which together form an empty area 101. Specifically, the top tube 11, middle tube 12, and bottom tube 13 are connected to each other by welding or integral molding to form a stable triangular main frame. This triangular frame, by utilizing the stability principle of triangles, provides the entire bicycle frame 10 with extremely high main rigidity and structural strength, so as to effectively withstand the impact from the road surface during riding, as well as the various forces generated during acceleration, braking, and steering.

[0083] It should be noted that, as Figure 1 , Figure 2 As shown, the shock absorber assembly 4 is rotatably mounted on the bottom of the upper tube 11. Specifically, the upper end of the shock absorber assembly 4 is rotatably mounted on the lower surface of the bottom of the upper tube 11 via a hinge seat or a rotating shaft. By setting the mounting point of the shock absorber assembly 4 at the bottom of the upper tube 11, the force transmission path from the rear fork assembly 2 through the connecting rod assembly 3 to the shock absorber assembly 4 is effectively shortened, reducing energy loss during transmission and thus directly improving the shock absorption system's response speed and efficiency to impacts.

[0084] It should also be noted that, such as Figure 4 As shown, the bottom of the upper tube 11 is also provided with a receiving cavity 102, the opening of which is exposed in the empty area 101; the connecting rod assembly 3 is rotatably connected to the receiving cavity 102. Specifically, the frame connection end 311 of the connecting rod assembly 3 is set in the main triangular frame through the opening of the receiving cavity 102, thus achieving a high degree of integration of the frame structure.

[0085] Furthermore, such as Figure 1 , Figure 3 As shown, the center tube 12 is located between the two connecting arms 21a. Specifically, the center tube 12 serves as the vertical backbone of the main triangular frame. By positioning the center tube 12 between the two connecting arms 21a of the rear fork assembly 2, it provides solid central support for the rear fork assembly 2 in the lateral direction, effectively constraining the lateral sway tendency of the rear fork assembly 2, significantly enhancing the overall balance and stability of the vehicle when cornering or bearing lateral forces, and reducing lateral deformation.

[0086] Understandably, the upper tube 11, middle tube 12, and lower tube 13 form a stable triangular empty area 101, optimizing structural strength. The shock absorber assembly 4 is located at the bottom of the upper tube 11 to shorten the force transmission path and improve shock absorption efficiency. The accommodating cavity 102 is located at the bottom of the upper tube 11 and opens into the empty area 101, thus eliminating the need for additional structures or components to form the accommodating cavity 102. This ensures the overall structural flatness of the upper tube 11 and improves the compactness of the frame. The middle tube 12, located between the two connecting arms 21a, enhances overall balance and reduces lateral deformation.

[0087] like Figure 4 As shown, in some embodiments of the bicycle frame 10, the accommodating cavity 102 is a triangular cavity whose inner wall contour is adapted to the movement trajectory of the frame connection end 311.

[0088] Understandably, the accommodating cavity 102 is specifically configured as a triangular cavity. The three inner walls of the triangular cavity together form a space that is approximately triangular in the horizontal cross section. By utilizing the inherent geometric stability of the triangular structure, the accommodating cavity 102 can be provided with high structural rigidity, thereby better withstanding the forces from the internal rotating components.

[0089] It should be noted that the inner wall contour of the triangular cavity of the accommodating cavity 102 is adapted to the movement trajectory of the frame connecting end 311. This means that each inner wall surface of the triangular cavity maintains a small and uniform gap with the movement trajectory of the frame connecting end 311 during rotation. This provides the frame connecting end 311 with a movement space that is both interference-free and as compact as possible, ensuring smooth and precise rotation, avoiding collisions or hard friction between the frame connecting end 311 and the inner wall of the accommodating cavity 102, and effectively reducing wear.

[0090] The present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to the present invention. Furthermore, it is understood that the steps in the method of the present invention embodiments can be adjusted, combined, and deleted according to actual needs, and the modules in the device of the present invention embodiments can be combined, divided, and deleted according to actual needs.

[0091] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A bicycle frame (10), characterized in that, include: The main frame (1) encloses an empty area (101). The rear fork assembly (2) has one end rotatably connected to the frame body (1), and the other end of the rear fork assembly (2) has two connecting arms (21a) spaced apart, with the frame body (1) located between the two connecting arms (21a). Linkage assembly (3), the linkage assembly (3) is located in the vacant area (101) and rotatably connected to the frame body (1), the linkage assembly (3) is also located between the two connecting arms (21a) and rotatably connected to at least one of the connecting arms (21a); ​​and The shock absorber assembly (4) is rotatably mounted on the frame body (1), and the telescopic end of the shock absorber assembly (4) is movably connected to the linkage assembly (3). The vertical projection area of ​​the frame body (1) completely or partially covers the vertical projection area of ​​the link assembly (3); The projected area of ​​the connecting arm (21a) in the horizontal direction completely or partially covers the projected area of ​​the link assembly (3) in the horizontal direction.

2. The bicycle frame according to claim 1, characterized in that, The rear fork assembly (2) includes a rear upper fork (21) and a rear lower fork (22). The upper rear fork (21) includes two connecting arms (21a), one end of the lower rear fork (22) is rotatably connected to the frame body (1), and the other end of the lower rear fork (22) is connected to the two connecting arms (21a).

3. The bicycle frame according to claim 1, characterized in that, The linkage assembly (3) includes a rear fork linkage (31) and a shock absorber linkage (32). The rear fork link (31) includes a frame connecting end (311) and two rear fork fixing ends (312). The frame connecting end (311) is rotatably connected to the frame body (1), and the two rear fork fixing ends (312) are rotatably connected to the two connecting arms (21a) in a one-to-one correspondence, and the two rear fork fixing ends (312) are located between the two connecting arms (21a). The shock absorber link (32) includes a shock absorber connection end (321) and two rear fork linkage ends (322). The shock absorber connection end (321) is movably connected to the telescopic end of the shock absorber assembly (4). The two rear fork linkage ends (322) are rotatably connected to the two connecting arms (21a) in a one-to-one correspondence, and the two rear fork linkage ends (322) are located between the two connecting arms (21a).

4. The bicycle frame according to claim 3, characterized in that, Each of the connecting arms (21a) is provided with a first connecting part (211) and a second connecting part (212), with the first connecting part (211) and the second connecting part (212) spaced apart; The two first connecting parts (211) are rotatably connected to the two rear fork fixing ends (312) in a one-to-one correspondence, and the two second connecting parts (212) are rotatably connected to the two rear fork linkage ends (322) in a one-to-one correspondence.

5. The bicycle frame according to claim 4, characterized in that, The first connecting part (211) is adapted to the outer surface of the rear fork fixing end (312); The second connecting part (212) is adapted to the outer surface of the rear fork linkage end (322).

6. The bicycle frame according to claim 5, characterized in that, Each of the first connecting portions (211) is provided with a clearance groove (2111), and each clearance groove (2111) is provided with a first connecting hole (2112). The two rear fork fixing ends (312) are rotatably connected to the two first connecting holes (2112) in a one-to-one correspondence. At least a portion of each rear fork fixing end (312) is located in the clearance groove (2111); and / or Each of the second connecting parts (212) is provided with a occupant boss (2121), and each of the occupant bosses (2121) is provided with a second connecting hole (2122). The two rear fork linkage ends (322) are rotatably connected to the two second connecting holes (2122) in a one-to-one correspondence. The size of the gap between the two occupant bosses (2121) is adapted to the shape of the shock absorber link (32).

7. The bicycle frame according to claim 3, characterized in that, The frame body (1) has a receiving cavity (102), the opening of the receiving cavity (102) faces the empty area (101), the frame connecting end (311) is rotatably connected to the receiving cavity (102), and the projected area of ​​the receiving cavity (102) in the horizontal direction is greater than the maximum projected area of ​​the frame connecting end (311) in the horizontal direction.

8. The bicycle frame according to claim 7, characterized in that, The frame body (1) includes an upper tube (11), a middle tube (12) and a lower tube (13). The upper tube (11), the middle tube (12) and the lower tube (13) together form the empty area (101). The shock absorber assembly (4) is rotatably disposed at the bottom of the upper tube (11). The bottom of the upper tube (11) is also provided with a receiving cavity (102). The opening of the receiving cavity (102) is exposed in the empty area (101). The connecting rod assembly (3) is rotatably connected in the receiving cavity (102). The middle tube (12) is located between the two connecting arms (21a).

9. The bicycle frame according to claim 7, characterized in that, The accommodating cavity (102) is a triangular cavity whose inner wall contour is adapted to the movement trajectory of the frame connection end (311).

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