Shock-proof frame

Abstract

The invention discloses a suspension frame which comprises a front tripod and a rear fork support, and the front tripod is located in front of the rear fork support. The front tripod comprises an upper tube, a lower tube and a seat tube, the upper end and the lower end of the seat tube are connected with the rear end of the upper tube and the rear end of the lower tube respectively, and the front end of the upper tube is connected with the front end of the lower tube; the lower pipe is provided with a first connecting point, the seat pipe is provided with a second connecting point and a third connecting point which are sequentially arranged from top to bottom, the second connecting point is hinged to the top end of a first connecting rod, the middle of the first connecting rod is hinged to the front end of a second connecting rod, and the bottom end of the first connecting rod is hinged to the rear end of a shock absorber; the rear end of the second connecting rod is hinged to the front upper end of the rear fork support, the front lower end of the rear fork support is hinged to the third connecting point, and the front end of the shock absorber is hinged to the first connecting point. The shock absorber is reasonable in structural design, the shock absorption stroke is increased, and stress points are dispersed.

Description

Technical Field

[0001] The present invention relates to the technical field of bicycles, in particular to a shock-absorbing frame. Background Art

[0002] In the prior art, a shock-absorbing frame with application number 202111141524.9 and titled "A shock-absorbing frame suitable for shock-absorbing vehicles" is provided. The shock-absorbing frame achieves a shock-absorbing effect through the cooperation of a second connecting rod, a first connecting rod, and a shock absorber.

[0003] However, in the above-mentioned conventional suspension frame, since the bottom end of the first link is the turning point, the top end of the first link rotates forward and downward (the top end of the first link is the central hinge point of the second link and the shock absorber), resulting in a small suspension stroke and concentrated stress points, which is not conducive to improving the safety factor. Summary of the Invention

[0004] The object of the present invention is to provide a shock-absorbing frame to solve the technical problem in existing shock-absorbing frames that, due to the bottom end of the first link being the turning point, the top end of the first link rotates forward and downward (the top end of the first link is the centralized hinge point of the second link and the shock absorber), resulting in a small shock-absorbing stroke, concentrated stress points, and a disadvantage in improving the safety factor.

[0005] In order to achieve the above-mentioned objectives, the technical solution of the present invention provides a suspension frame, including a front triangle frame and a rear fork bracket, the front triangle frame is located in front of the rear fork bracket; the front triangle frame includes an upper tube, a down tube, and a seat tube, the upper and lower ends of the seat tube are respectively connected to the rear end of the upper tube and the rear end of the down tube, and the front end of the upper tube is connected to the front end of the down tube; a first connection point is provided on the down tube, and a second connection point and a third connection point are provided on the seat tube in sequence from top to bottom, the second connection point is hinged to the top end of the first connecting rod, the middle part of the first connecting rod is hinged to the front end of the second connecting rod, and the bottom end of the first connecting rod is hinged to the rear end of the shock absorber; the rear end of the second connecting rod is hinged to the front upper end of the rear fork bracket, the front lower end of the rear fork bracket is hinged to the third connection point, and the front end of the shock absorber is hinged to the first connection point.

[0006] Furthermore, the seat tube extends up and down, and the down tube extends obliquely toward the front and upper part; the first connection point is located in the middle of the down tube, the second connection point is located above and behind the first connection point, and the third connection point is located below and behind the first connection point; the first connecting rod is located in front of the seat tube, and the shock absorber is located above and behind the down tube.

[0007] Furthermore, the hinge point formed by the bottom end of the first link and the rear end of the shock absorber moves in front of the third connection point, the hinge point formed by the middle of the first link and the front end of the second link moves in front of the second connection point and the third connection point, and the hinge point formed by the rear end of the second link and the front upper end of the rear fork bracket moves behind the second connection point and the third connection point.

[0008] Furthermore, the shock absorber extends obliquely toward the front and upper part, and the second connecting rod extends obliquely toward the rear and upper part; the first connection point is protrudingly provided on the inner side surface of the down tube, the second connection point is protrudingly provided on the inner side surface of the seat tube, and the third connection point passes through the seat tube left and right; a fixed shaft is provided inside the third connection point, and the left and right side walls of the front lower end of the rear fork bracket are respectively hinged to the two ends of the fixed shaft, and the shock absorber's shock absorption stroke is 170MM±10MM.

[0009] Furthermore, an assembly groove is provided inside the first connecting rod, and the notch of the assembly groove is arranged opposite to the inner side surface of the seat tube; the left and right side walls of the top end of the assembly groove are hinged to the left and right side walls of the second connection point respectively, and the left and right side walls of the bottom end of the assembly groove are hinged to the left and right side walls of the rear end of the shock absorber respectively, and the front upper end of the assembly groove is provided with an upper avoidance opening for the passage of the second connection point, and the front lower end of the assembly groove is provided with a lower avoidance opening for the passage of the rear end of the shock absorber.

[0010] Furthermore, the second connecting rod includes a connecting end and two connecting arms, and the front ends of the two connecting arms are connected through the connecting end so that the second connecting rod is in the shape of a U-shaped rod; the connecting end is located between the assembly groove and the seat tube, and the two connecting arms are respectively located on the left and right sides of the seat tube, and the connecting arms extend obliquely toward the rear and upper part, and the front ends of the two connecting arms are respectively hinged to the left and right side walls of the middle part of the assembly groove, and the rear ends of the two connecting arms are respectively hinged to the left and right side walls of the front upper end of the rear fork bracket.

[0011] Furthermore, the rear fork bracket includes a seat fork and a chain fork located on the left side and a seat fork and a chain fork located on the right side, and the rear ends of the seat forks on the left and right sides are respectively integrally formed with the rear ends of the chain forks on the left and right sides; the front ends of the chain forks on the left and right sides are respectively hinged to the two ends of the fixed axis, and the front ends of the seat forks on the left and right sides are respectively hinged to the rear ends of the two connecting arms.

[0012] Furthermore, the front end inner side walls of the upper forks on the left and right sides are respectively provided with arc-shaped rotation grooves with openings facing forward and upward, and the rear ends of the two connecting arms are respectively hinged to the arc-shaped rotation grooves on the left and right sides, and the arc-shaped rotation grooves can limit the rotation range of the connecting arms.

[0013] Furthermore, the front ends of the rear chain forks on the left and right sides are respectively integrally formed with the left and right ends of the first horizontal plate, and the first horizontal plate is located behind and below the third connection point; the rear seat forks on the left and right sides are respectively integrally formed with the left and right ends of the second horizontal plate, and the second horizontal plate is located behind the arc-shaped rotation groove; the front end of the rear chain fork on the left side and the front end of the rear chain fork are respectively integrally formed with the upper and lower ends of the vertical plate on the left side, and the front end of the rear chain fork on the right side are respectively integrally formed with the upper and lower ends of the vertical plate on the right side.

[0014] Furthermore, a gear disc is rotatably provided on one end of the fixed shaft, and the gear disc is located on the outside of the rear fork bracket.

[0015] In summary, the technical solution of the present invention has the following beneficial effects: the structural design of the present invention is reasonable, and includes a front triangle frame and a rear fork bracket, the front triangle frame is located in front of the rear fork bracket; the front triangle frame includes an upper tube, a lower tube, and a seat tube, the upper and lower ends of the seat tube are respectively connected to the rear end of the upper tube and the rear end of the lower tube, and the front end of the upper tube is connected to the front end of the lower tube; a first connection point is provided on the lower tube, and a second connection point and a third connection point are provided on the seat tube in sequence from top to bottom, the second connection point is hinged to the top end of the first connecting rod, the middle part of the first connecting rod is hinged to the front end of the second connecting rod, and the bottom end of the first connecting rod is hinged to the shock absorber The rear end of the second connecting rod is hinged to the front upper end of the rear fork bracket, the front lower end of the rear fork bracket is hinged to the third connection point, and the front end of the shock absorber is hinged to the first connection point; so that when the rear fork bracket encounters vibration, the rear fork bracket will swing forward and downward around the third connection point, and then the rear fork bracket will transmit the impact force of the rear fork bracket to the middle part of the first connecting rod through the second connecting rod, and then drive the first connecting rod to swing forward and upward around the second connection point, and then the first connecting rod will drive the shock absorber to swing adaptively around the first connection point, and at the same time the shock absorber will elastically contract, thereby achieving a shock-absorbing effect. From this analysis, it can be seen that the present invention realizes the coordination of multiple hinge points (i.e., multiple turning points) by arranging the coordination of the first connecting rod, the second connecting rod, and the shock absorber (i.e., multi-link). Since the top, middle, and bottom ends of the first connecting rod are respectively the turning point, the hinge point of the second connecting rod, and the hinge point of the shock absorber, the shock absorption stroke is increased (so that the rear fork bracket can have a larger swing space, which is convenient for improving the shock absorption and buffering performance), the stress points are dispersed (because the dispersed stress points are safer and less likely to break), and ultimately the safety factor is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention from a first viewing angle;

[0017] Figure 2 is a schematic diagram of the three-dimensional structure of the present invention from a second viewing angle;

[0018] Figure 3 is a schematic diagram of the three-dimensional structure of the present invention from a third viewing angle;

[0019] Figure 4 is a schematic diagram of the three-dimensional structure of the present invention from a fourth viewing angle;

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the front tripod of the present invention;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the rear fork bracket of the present invention;

[0022] Figure 7 This is a schematic diagram of the three-dimensional structure of the present invention when the front tripod and rear fork bracket are removed;

[0023] Description of the accompanying drawings: front tripod (1), rear fork bracket (2), first connecting rod (3), second connecting rod (4), shock absorber (5), fixed shaft (6), toothed disc (7), water bottle placement rack (8), water bottle (9);

[0024] An upper tube (101), a lower tube (102), a seat tube (103); a rear upper fork (201), a rear lower fork (202), an arc-shaped rotation groove (203), a first horizontal plate (204), a second horizontal plate (205), a vertical plate (206); an assembly groove (301), an upper avoidance opening (302), a lower avoidance opening (303); a connecting end (401), a connecting arm (402); a first connecting point (1021), a second connecting point (1031), and a third connecting point (1032). DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention, but this does not constitute a limitation on the protection scope of the present invention.

[0026] In the present invention, for a clearer description, the following explanation is made: the observer faces the Figure 1 For observation, the left side of the observer is set as the front, the right side of the observer is set as the back, the front of the observer is set as the right, the back of the observer is set as the left, the top of the observer is set as the top, and the bottom of the observer is set as the bottom. It should be noted that the terms "front end", "rear end", "left side", "right side", "middle", "top", "bottom" and the like in the text indicate directions or positional relationships based on the directions or positional relationships set in the accompanying drawings. They are only for the convenience of clearly describing the present invention, and do not indicate or imply that the structure or component referred to must have a specific direction or be constructed in a specific direction. Therefore, they cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clarifying or simplifying the description, and cannot be understood as indicating or implying relative importance or quantity.

[0027] See also Figures 1 to 7The present embodiment provides a suspension frame, comprising a front triangle frame 1 and a rear fork bracket 2. The front triangle frame 1 is located in front of the rear fork bracket 2. The front triangle frame 1 comprises an upper tube 101, a lower tube 102, and a seat tube 103. The upper and lower ends of the seat tube 103 are respectively connected to the rear end of the upper tube 101 and the rear end of the lower tube 102. The front end of the upper tube 101 is connected to the front end of the lower tube 102. The lower tube 102 is provided with a first connection point 1021. The seat tube 103 is provided with a connection point extending from the upper end to the lower end. The second connection point 1031 and the third connection point 1032 are arranged downward in sequence, the second connection point 1031 is hinged to the top end of the first connecting rod 3, the middle part of the first connecting rod 3 is hinged to the front end of the second connecting rod 4, and the bottom end of the first connecting rod 3 is hinged to the rear end of the shock absorber 5; the rear end of the second connecting rod 4 is hinged to the front upper end of the rear fork bracket 2, the front lower end of the rear fork bracket 2 is hinged to the third connection point 1032, and the front end of the shock absorber 5 is hinged to the first connection point 1021. Function: The front triangle frame is located in front of the rear fork frame. The front triangle frame includes an upper tube, a lower tube and a seat tube. The upper and lower ends of the seat tube are respectively connected to the rear end of the upper tube and the rear end of the lower tube, and the front end of the upper tube is connected to the front end of the lower tube. The lower tube is provided with a first connection point, and the seat tube is provided with a second connection point and a third connection point arranged in sequence from top to bottom. The second connection point is hinged to the top end of the first connecting rod, the middle part of the first connecting rod is hinged to the front end of the second connecting rod, and the bottom end of the first connecting rod is hinged to the rear end of the shock absorber. The rear end of the second connecting rod is hinged to the rear fork. The front upper end of the bracket is hinged, the front lower end of the rear fork bracket is hinged to the third connection point, and the front end of the shock absorber is hinged to the first connection point; so that when the rear fork bracket encounters vibration, the rear fork bracket will swing forward and downward around the third connection point, and then the rear fork bracket will transmit the impact force of the rear fork bracket to the middle part of the first connection rod through the second connecting rod, and then drive the first connecting rod to swing forward and upward around the second connection point, and then the first connecting rod will drive the shock absorber to swing adaptively around the first connection point, and at the same time the shock absorber will undergo elastic contraction, thereby achieving a shock-absorbing effect. From this analysis, it can be seen that the present invention realizes the coordination of multiple hinge points (i.e., multiple turning points) by setting the coordination of the first connecting rod, the second connecting rod, and the shock absorber (i.e., multi-link). Since the top, middle, and bottom ends of the first connecting rod are respectively the turning point, the hinge point of the second connecting rod, and the hinge point of the shock absorber, the shock absorber stroke is increased (so that the rear fork bracket can have a larger swing space, which is convenient for improving the shock absorption and buffering performance), the stress points are dispersed (because the stress points are more secure and less likely to break), and the safety factor is finally improved. After actual testing: In the prior art, the shock absorber frame with application number 202111141524.9 and the name "A shock absorber frame suitable for shock absorber vehicles" has a shock absorber stroke of only 120MM, while the shock absorber stroke of the present invention can be 170MM, and the shock absorber stroke has been increased by 50MM. Therefore, the innovation of the shock absorber stroke, shock absorption effect, comfort and safety have been greatly improved.It is worth noting that the shock absorber stroke can be calculated by the length of the shock absorber, because it can be seen from the length of the shock absorber that the greater the shock absorber stroke, the longer the shock absorber is. This is the most direct manifestation.

[0028] Specifically, the seat tube 103 extends vertically, while the down tube 102 extends obliquely forward and upward. A first connection point 1021 is located in the middle of the down tube 102, a second connection point 1031 is located above and behind the first connection point 1021, and a third connection point 1032 is located below and behind the first connection point 1021. The first link 3 is located in front of the seat tube 103, and the shock absorber 5 is located above and behind the down tube 102. Function: Generally speaking, the longer the shock absorber's stroke, the better the shock absorption effect. However, this requires careful consideration of the location, number, angle, and stress of the pivot points. Otherwise, not only will the shock absorber's shock absorption effect be poor, but it may also easily break the rear fork bracket. In the present invention, the first connection point 1021, the second connection point 1031, and the third connection point 1032 are arranged in a triangular pattern, allowing the impact force to be transmitted sequentially through the rear fork bracket, the second link, the first link, and the shock absorber, forming a Z-shaped impact transmission path. This effectively meets the long shock absorber stroke, improves the shock absorption effect, and disperses stress points.

[0029] Specifically, the hinge point formed between the bottom end of the first link 3 and the rear end of the shock absorber 5 moves forward of the third connection point 1032. The hinge point formed between the middle portion of the first link 3 and the front end of the second link 4 moves forward of the second connection point 1031 and the third connection point 1032. The hinge point formed between the rear end of the second link 4 and the front upper end of the rear fork bracket 2 moves rearward of the second connection point 1031 and the third connection point 1032. Function: Because all three hinge points are movable, by moving forward or rearward between the second connection point 1031 and the third connection point 1032, or forward of the third connection point 1032, Z-shaped transmission of impact force is facilitated, thereby meeting the expansion and contraction and rotation requirements of the shock absorber.

[0030] Specifically, the shock absorber 5 extends obliquely toward the front and upper part, and the second connecting rod 4 extends obliquely toward the rear and upper part; the first connection point 1021 is protrudingly provided on the inner side surface of the down tube 102, the second connection point 1031 is protrudingly provided on the inner side surface of the seat tube 103, and the third connection point 1032 passes through the seat tube 103 left and right; a fixed shaft 6 is provided inside the third connection point 1032, and the left and right side walls of the front lower end of the rear fork bracket 2 are respectively hinged to the two ends of the fixed shaft 6, and the shock absorption stroke of the shock absorber 5 is 170MM±10MM. Function: The shock absorber 5 and the second connecting rod 4 are tilted so that when the rear fork bracket encounters vibration, the rear fork bracket will swing forward and downward about the third connection point. The rear fork bracket then quickly transmits the impact force of the rear fork bracket forward and downward to the middle of the first connecting rod through the second connecting rod, which then drives the first connecting rod to swing forward and upward about the second connection point. The first connecting rod then drives the shock absorber to swing backward and upward about the first connection point. Simultaneously, the shock absorber elastically contracts, thereby achieving a shock absorption effect. In other words, this not only improves the compactness of the structure, but also improves the efficiency of impact force transmission, thereby better shock absorption. The first connecting point 1021 and the second connecting point 1031 are protruding from the inner side surface, allowing for better articulation with the first connecting rod and shock absorber. The provision of the fixed axis 6 ensures a more balanced support force for the rear fork bracket. With the above-mentioned suspension frame structure, setting the shock absorber 5 to a suspension travel of 170mm ± 10mm can achieve a relatively ideal shock absorption effect.

[0031] Specifically, a mounting slot 301 is provided within the first connecting rod 3. The notch of the mounting slot 301 is positioned opposite the inner side surface of the seat tube 103. The left and right side walls at the top of the mounting slot 301 are hingedly connected to the left and right side walls of the second connection point 1031, respectively. The left and right side walls at the bottom of the mounting slot 301 are hingedly connected to the left and right side walls of the rear end of the shock absorber 5, respectively. An upper clearance opening 302 is provided at the front upper end of the mounting slot 301 for passage of the second connection point 1031, and a lower clearance opening 303 is provided at the front lower end of the mounting slot 301 for passage of the rear end of the shock absorber 5. Function: The provision of the mounting slot 301 allows for better articulated coordination with the shock absorber and the second connection point 1031. The upper and lower clearance openings 302 and 303 prevent interference with the normal rotation of the first connecting rod and the shock absorber.

[0032] Specifically, the second connecting rod 4 includes a connecting end 401 and two connecting arms 402. The front ends of the two connecting arms 402 are connected by the connecting end 401, giving the second connecting rod 4 a U-shaped rod shape. The connecting end 401 is located between the assembly groove 301 and the seat tube 103. The two connecting arms 402 are located on the left and right sides of the seat tube 103, extending obliquely upward and rearward. The front ends of the two connecting arms 402 are hinged to the left and right side walls of the middle portion of the assembly groove 301, and the rear ends of the two connecting arms 402 are hinged to the left and right side walls of the front upper end of the rear fork bracket 2. Function: The arrangement of the connecting end 401 and the two connecting arms 402 can improve force balance and ensure normal rotational coordination between the second connecting rod 4 and the first connecting rod.

[0033] Specifically, the rear fork bracket 2 includes a seat stay 201 and a chain stay 202 on the left side, and a seat stay 201 and a chain stay 202 on the right side. The rear ends of the seat stays 201 on the left and right sides are integrally formed with the rear ends of the chain stays 202 on the left and right sides, respectively. The front ends of the chain stays 202 on the left and right sides are hinged to the ends of the fixed shaft 6, respectively, and the front ends of the seat stays 201 on the left and right sides are hinged to the rear ends of the two connecting arms 402. Function: The integral molding can greatly improve the strength of the rear fork bracket; the front ends of the seat stays 201 and chain stays 202 on the left and right sides are hinged, which can improve the force balance of the rear fork bracket.

[0034] Specifically, the front inner sidewalls of the left and right seat stays 201 are each provided with an arcuate rotation slot 203, opening toward the front and upward. The rear ends of the two connecting arms 402 are hingedly connected to the arcuate rotation slots 203 on either side, respectively. The arcuate rotation slots 203 limit the rotation range of the connecting arms 402. Function: The arcuate rotation slots 203 limit the rotation angle between the seat stay 201 and the connecting arms 402, thereby keeping their rotation within a reasonable range. Furthermore, because the second connecting rod 4 is entirely located within the rear fork bracket and the assembly slot 301, it improves structural compactness while facilitating the sequential transmission of impact force, thereby facilitating shock absorption.

[0035] Specifically, the front ends of the left and right chain stays 202 are integrally formed with the left and right ends of a first horizontal plate 204, respectively. The first horizontal plate 204 is located below and behind the third connection point 1032. The left and right seat stays 201 are integrally formed with the left and right ends of a second horizontal plate 205, respectively. The second horizontal plate 205 is located behind the arc-shaped rotation slot 203. The front ends of the left seat stay 201 and the chain stay 202 are integrally formed with the upper and lower ends of the left vertical plate 206, respectively. The front ends of the right seat stay 201 and the chain stay 202 are integrally formed with the upper and lower ends of the right vertical plate 206, respectively. Function: The first and second horizontal plates 204 and 205 limit the rotation range of the rear fork bracket, while the vertical plate 206 increases the overall strength of the rear fork bracket.

[0036] Specifically, a sprocket 7 is rotatably mounted on one end of the fixed shaft 6, and is located outside the rear fork bracket 2. Function: Since the fixed shaft 6 is stationary, while the sprocket 7 is rotatable, the sprocket 7 can be used to coordinate with sprockets in other locations for transmission. This allows for an additional sprocket compared to existing suspension frames, enabling faster acceleration and saving effort.

[0037] Preferably, the suspension frame can be a carbon fiber suspension frame, which can be selected as needed. Since the downtube 102 is thicker than the upper tube 101, the first connection point 1021 is located on the inner side of the downtube 102. This provides better support for the shock absorber, greater strength, increased safety, and improved shock absorption. A water bottle holder 8 is provided on the inner side of the downtube 102. The water bottle holder 8 can hold a water bottle 9 and is located above and in front of the first connection point 1021.

[0038] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A suspension frame, comprising a front triangle frame (1) and a rear fork frame (2), wherein the front triangle frame (1) is located in front of the rear fork frame (2); characterized in that: The front tripod (1) comprises an upper tube (101), a lower tube (102), and a seat tube (103); the upper and lower ends of the seat tube (103) are respectively connected to the rear end of the upper tube (101) and the rear end of the lower tube (102); the front end of the upper tube (101) is connected to the front end of the lower tube (102); the lower tube (102) is provided with a first connection point (1021); the seat tube (103) is provided with a second connection point (1031), a third connection point (1032), and a fourth connection point (1033) arranged in sequence from top to bottom. 1032), the second connection point (1031) is hinged to the top end of the first connection rod (3), the middle part of the first connection rod (3) is hinged to the front end of the second connection rod (4), and the bottom end of the first connection rod (3) is hinged to the rear end of the shock absorber (5); the rear end of the second connection rod (4) is hinged to the front upper end of the rear fork bracket (2), the front lower end of the rear fork bracket (2) is hinged to the third connection point (1032), and the front end of the shock absorber (5) is hinged to the first connection point (1021).

2. The shock-absorbing frame according to claim 1, characterized in that: The seat tube (103) extends up and down, and the lower tube (102) extends obliquely toward the front and upper part; the first connection point (1021) is located in the middle of the lower tube (102), the second connection point (1031) is located above and behind the first connection point (1021), and the third connection point (1032) is located below and behind the first connection point (1021); the first connecting rod (3) is located in front of the seat tube (103), and the shock absorber (5) is located above and behind the lower tube (102).

3. The shock-absorbing frame according to claim 2, characterized in that: The hinge point formed by the bottom end of the first connecting rod (3) and the rear end of the shock absorber (5) moves in front of the third connecting point (1032), the hinge point formed by the middle part of the first connecting rod (3) and the front end of the second connecting rod (4) moves in front of the second connecting point (1031) and the third connecting point (1032), and the hinge point formed by the rear end of the second connecting rod (4) and the front upper end of the rear fork bracket (2) moves in the rear between the second connecting point (1031) and the third connecting point (1032).

4. The shock-absorbing frame according to claim 3, characterized in that: The shock absorber (5) extends obliquely toward the front and upward, and the second connecting rod (4) extends obliquely toward the rear and upward; the first connection point (1021) is protrudingly provided on the inner side surface of the lower tube (102), the second connection point (1031) is protrudingly provided on the inner side surface of the seat tube (103), and the third connection point (1032) passes through the seat tube (103) left and right; a fixed shaft (6) is provided inside the third connection point (1032), and the left and right side walls of the front lower end of the rear fork bracket (2) are respectively hinged to the two ends of the fixed shaft (6), and the shock absorbing stroke of the shock absorber (5) is 170MM±10MM.

5. The shock-absorbing frame according to claim 4, characterized in that: An assembly groove (301) is provided inside the first connecting rod (3), and the notch of the assembly groove (301) is arranged opposite to the inner side surface of the seat tube (103); the left and right side walls at the top of the assembly groove (301) are hinged to the left and right side walls of the second connection point (1031) respectively, and the left and right side walls at the bottom of the assembly groove (301) are hinged to the left and right side walls at the rear end of the shock absorber (5) respectively; the front upper end of the assembly groove (301) is provided with an upper avoidance opening (302) for the second connection point (1031) to pass through, and the front lower end of the assembly groove (301) is provided with a lower avoidance opening (303) for the rear end of the shock absorber (5) to pass through.

6. The shock-absorbing frame according to claim 5, characterized in that: The second connecting rod (4) includes a connecting end (401) and two connecting arms (402), the front ends of the two connecting arms (402) are connected through the connecting end (401), so that the second connecting rod (4) is in the shape of a U-shaped rod; the connecting end (401) is located between the assembly groove (301) and the seat tube (103), the two connecting arms (402) are respectively located on the left and right sides of the seat tube (103), the connecting arms (402) extend obliquely toward the rear and upward, the front ends of the two connecting arms (402) are respectively hinged to the left and right side walls of the middle part of the assembly groove (301), and the rear ends of the two connecting arms (402) are respectively hinged to the left and right side walls of the front upper end of the rear fork bracket (2).

7. The shock-absorbing frame according to claim 6, characterized in that: The rear fork bracket (2) comprises a rear upper fork (201) and a rear lower fork (202) on the left side and a rear upper fork (201) and a rear lower fork (202) on the right side, wherein the rear ends of the rear upper forks (201) on the left and right sides are respectively integrally formed with the rear ends of the rear lower forks (202) on the left and right sides; the front ends of the rear lower forks (202) on the left and right sides are respectively hinged to the two ends of the fixed shaft (6), and the front ends of the rear upper forks (201) on the left and right sides are respectively hinged to the rear ends of the two connecting arms (402).

8. The shock-absorbing frame according to claim 7, characterized in that: The front inner side walls of the upper forks (201) on the left and right sides are respectively provided with arc-shaped rotation grooves (203) with openings facing the front and upper sides. The rear ends of the two connecting arms (402) are respectively hinged to the arc-shaped rotation grooves (203) on the left and right sides. The arc-shaped rotation grooves (203) can limit the rotation range of the connecting arms (402).

9. The shock-absorbing frame according to claim 8, characterized in that: The front ends of the rear lower forks (202) on the left and right sides are respectively integrally formed with the left and right ends of the first horizontal plate (204), and the first horizontal plate (204) is located behind and below the third connection point (1032); the rear upper forks (201) on the left and right sides are respectively integrally formed with the left and right ends of the second horizontal plate (205), and the second horizontal plate (205) is located behind the arc-shaped rotation groove (203); the front end of the rear upper fork (201) on the left and the front end of the rear lower fork (202) are respectively integrally formed with the upper and lower ends of the left vertical plate (206), and the front end of the rear upper fork (201) on the right and the front end of the rear lower fork (202) are respectively integrally formed with the upper and lower ends of the right vertical plate (206).

10. The shock-absorbing frame according to any one of claims 4 to 9, characterized in that: A toothed disc (7) is rotatably provided at one end of the fixed shaft (6), and the toothed disc (7) is located outside the rear fork bracket (2).

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