Foldable frame and folding bicycle

Abstract

The utility model provides a foldable frame and a foldable bicycle. The foldable frame comprises a front frame connected with a first connecting structural member, a rear frame connected with a second connecting structural member, a pivoting shaft and a locking assembly. The first connecting structural member and the second connecting structural member are pivoted through a pivoting shaft, and the front frame and the rear frame relatively rotate around the pivoting shaft within a preset stroke range based on pivoting matching of the first connecting structural member and the second connecting structural member, and are locked in an unfolded state or a folded state based on a locking assembly. Through the improved design of related structures of the locking assembly, the first connecting structural member and the second connecting structural member, the state switching operation of the foldable frame is simple and convenient, and the foldable frame has good use convenience and practicability.

Description

Technical Field

[0001] The utility model relates to the field of transportation tools, in particular to a foldable frame and a folding bicycle. Background Art

[0002] The folding bike's unique design reduces its actual space usage by folding, making it easier to carry and store. The key goal of this design is to provide a flexible switching structure, making it easier to switch between different configurations to suit different environments and space requirements.

[0003] In the prior art, some folding bicycles have relatively complex structures for switching between different forms, and their operational conveniences are intertwined, which affects the efficiency of the folding bicycles. Utility Model Content

[0004] The utility model provides a foldable frame and a foldable bicycle. The state switching operation of the foldable frame is simple and convenient, and the foldable frame has good convenience and practicality.

[0005] Accordingly, the present invention provides a foldable frame, comprising a front frame and a rear frame, and further comprising:

[0006] A first connecting structural member includes a first fixed end and a first pivot end, wherein the first fixed end is connected and fixed to the front frame;

[0007] A second connecting structural member includes a second fixed end, a second pivot end, and a center shaft mounting hole, wherein the second fixed end is connected and fixed to the rear frame, and an axis of the second pivot end and an axis of the center shaft mounting hole are not coaxial;

[0008] A pivot shaft, wherein the first pivot end and the second pivot end are respectively pivotally connected to the pivot shaft, and the first connecting structure and the second connecting structure rotate relative to each other within a preset range of travel with the pivot shaft as a rotation axis;

[0009] A locking assembly comprising a latch hole provided on the first connecting structure, an elastic member and a latch provided in the latch hole, and an unfolded locking hole and a folded locking hole provided on the second connecting structure;

[0010] During the relative rotation of the first connecting structure and the second connecting structure, the latch is driven by the elastic member to abut against the surface of the second connecting structure;

[0011] When the relative rotation angle of the first connecting structure and the second connecting structure is within a first preset angle range, the relative posture of the front frame and the rear frame is in an unfolded state, and the latch is driven by the elastic member to be inserted into the unfolded locking hole;

[0012] When the relative rotation angle of the first connecting structure and the second connecting structure is within a second preset angle range, the relative posture of the front frame and the rear frame is a folded state, and the latch is driven by the elastic member to be inserted into the folding locking hole.

[0013] In an optional embodiment, the front frame further includes an upper tube and a seat tube, one end of the seat tube is connected to the first fixed end, and the other end of the seat tube is connected to the upper tube.

[0014] In an optional embodiment, a seat post mounting structure is provided at one end of the seat tube away from the first fixed end.

[0015] In an optional embodiment, the front frame further includes a connecting pipe;

[0016] One end of the connecting pipe is connected to the first fixed end, and the other end of the connecting pipe is connected to the upper pipe.

[0017] In an optional embodiment, the rear frame includes:

[0018] A first connecting plate having a first connecting fixing end and a first connecting mounting end, wherein the first connecting fixing end is connected to the second fixing end;

[0019] a second connecting plate having a second connecting and fixing end and a second connecting and mounting end, wherein the second connecting and fixing end is connected to the second fixing end;

[0020] The first connecting plate and the second connecting plate are respectively arranged side by side along the axial direction of the center shaft mounting hole, and the rear wheel assembly mounting position is between the first connecting mounting end and the second connecting mounting end, and the first connecting mounting end and the second connecting mounting end are used for the installation of the rear wheel assembly.

[0021] In an optional embodiment, the rear frame further includes a reinforcement plate;

[0022] The reinforcing plate is connected and fixed to the first connecting plate and the second connecting plate respectively.

[0023] In an optional implementation manner, the left value and the right value of the first preset angle range are different.

[0024] In an optional embodiment, with the axis of the pivot shaft as a reference, the circumferential dimension of the expansion locking hole is greater than the radial dimension of the pin.

[0025] An optional embodiment further includes a shock-absorbing spring;

[0026] One end of the shock-absorbing spring is fixedly connected to the front frame, and when the relative posture of the front frame and the rear frame is in an unfolded state, the other end of the shock-absorbing spring abuts against the rear frame;

[0027] Or one end of the shock-absorbing spring is fixedly connected to the rear frame, and when the relative posture of the front frame and the rear frame is in the unfolded state, the other end of the shock-absorbing spring abuts against the front frame.

[0028] In an optional embodiment, a positioning bracket is provided on the first connecting structure, and the upper end of the latch is arranged to pass through the positioning bracket; and a pull wire fixedly connected to the upper end of the latch is further included, so that the latch can be operated by the pull wire.

[0029] Accordingly, the present invention provides a folding bicycle comprising the foldable bicycle frame.

[0030] In summary, the present invention provides a foldable frame and a foldable bicycle. When the user needs to switch the state of the foldable frame, such as switching the foldable frame from the folded state to the unfolded state, he only needs to pull the pin and unfold the foldable frame. When the pin is out of engagement with the folding locking hole, the pin can be released; the foldable frame is continued to be unfolded until the foldable frame is fully unfolded, and the pin will automatically fall into the unfolding locking hole under the drive of the elastic member, and the state of the foldable frame is switched. If the foldable frame needs to be switched from the unfolded state to the folded state, he only needs to pull the pin and fold the foldable frame. When the pin is out of engagement with the unfolding locking hole, the pin can be released; the foldable frame is continued to be folded until the foldable frame is fully folded, and the pin will automatically fall into the folding locking hole under the drive of the elastic member, and the state of the foldable frame is switched. The user operation is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a three-dimensional schematic diagram of the foldable frame structure of an embodiment of the present utility model.

[0033] Figure 2 This is a front view of the foldable frame structure of an embodiment of the present utility model.

[0034] Figure 3 This is a left side view of the foldable frame structure of an embodiment of the present utility model.

[0035] Figure 4 This is a cross-sectional structural diagram of the foldable frame structure of an embodiment of the present utility model.

[0036] Figure 5 This is a partially enlarged view of the foldable frame structure of an embodiment of the present utility model.

[0037] Figure 6 This is a schematic diagram of the coordination structure of the first connecting structural member and the second connecting structural member according to an embodiment of the present utility model.

[0038] Figure 7 This is a three-dimensional structural diagram of another embodiment of the foldable frame of the utility model.

[0039] Figure 8 yes Figure 7 A partial enlarged view of .

[0040] Figure 9 This is a schematic diagram of the three-dimensional structure of a folding bicycle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Combine Figures 1-6 As shown, an embodiment of the present invention provides a foldable frame, comprising a front frame 1 and a rear frame 2. Specifically, the front frame and the rear frame refer to two parts of the foldable frame that can be folded together.

[0043] Furthermore, the foldable frame of the embodiment of the utility model further includes:

[0044] The first connecting structural member 41 includes a first fixed end 47 and a first pivot end 49. The first fixed end 47 is connected and fixed to the front frame 1. Specifically, according to the structural difference of the front frame 1, the specific connection structure between the first fixed end 47 and the front frame 1 is different.

[0045] The second connecting structure 42 includes a second fixed end 46, a second pivot end 48, and a center axle mounting hole 45. The second fixed end 46 is connected and fixed to the rear frame 2. The axis of the second pivot end 48 and the axis of the center axle mounting hole 45 are not coaxial. Specifically, depending on the structural differences of the rear frame 2, the specific connection structure between the second fixed end 46 and the rear frame 2 is different.

[0046] A pivot shaft 44, wherein the first pivot end 49 and the second pivot end 48 are respectively pivotally connected to the pivot shaft 44, and the first connecting structure 41 and the second connecting structure 42 rotate relative to each other within a preset range of travel with the pivot shaft 44 as the rotation axis;

[0047] The locking assembly includes a latch hole 6 provided on the first connecting structure, an elastic member 7 and a latch 43 provided in the latch hole 6, and an unfolded locking hole 81 and a folded locking hole 82 provided on the second connecting structure 42;

[0048] During the relative rotation of the first connecting structure 41 and the second connecting structure 42 , the latch 43 is driven by the elastic member 61 to abut against the surface of the second connecting structure 42 ;

[0049] When the relative rotation angle between the first connecting structure 41 and the second connecting structure 42 is within a first preset angle range, the relative posture between the front frame 1 and the rear frame 2 is in an unfolded state, and the latch 43 is driven by the elastic member 7 to be inserted into the unfolding locking hole 81;

[0050] When the relative rotation angle of the first connecting structure 41 and the second connecting structure 42 is within a second preset angle range, the relative posture of the front frame 1 and the rear frame 2 is in a folded state, and the latch 43 is driven by the elastic member 7 to be inserted into the folding locking hole 82.

[0051] In the foregoing description, when the front frame 1 and the rear frame 2 are in the unfolded state and the folded state, the relative rotation angles of the first connecting structure 41 and the second connecting structure 42 in the two states are defined respectively. The relative rotation angle is understood as: a first vertical segment is drawn from a first fixed point on the front frame to the axis of the pivot shaft 44, and a second vertical segment is drawn from a second fixed point on the rear frame to the axis of the pivot shaft 44, forming a first vertical segment; and a second vertical segment is drawn from a second fixed point on the rear frame to the axis of the pivot shaft 44, forming a second vertical segment; with the axis of the pivot shaft as a reference, the angle formed by the second vertical segment and the first vertical segment in a preset fixed direction (clockwise or counterclockwise) is the relative rotation angle of the first connecting structure 41 and the second connecting structure 42. Based on the foregoing definition, the first connecting structure 41 and the second connecting structure 42 rotate relative to each other about the pivot shaft 44 within a preset travel range (i.e., the range of possible values ​​of the relative rotation angle), and the first preset angle range and the second preset angle range are within the preset travel range.

[0052] In actual implementation, the front frame and the rear frame can be folded with each other based on the cooperation of the first connecting structure and the second connecting structure; under the drive of the elastic member 7, the latch 43 in the latch hole 6 can be tightly attached to the outer surface of the second connecting structure, and when the relative rotation angle of the first structure and the second structure reaches the first preset angle range, due to the provision of the expansion locking hole 81, under the drive of the elastic member 7, the end of the latch 43 falls into the expansion locking hole 81; when the first connecting structure and the second connecting structure continue to rotate relative to each other, and the relative rotation angle needs to exceed the first preset angle range, the hole wall of the expansion locking hole 81 (with the axis of the pivot shaft as a reference, located at the expansion locking hole 81) is pressed. The position restriction of the hole wall in the circumferential direction of the unfolded locking hole 81 prevents the relative rotational movement of the first connecting structure and the second connecting structure from continuing; in actual implementation, it is necessary to pull the head end of the pin 43 so that the tail end of the pin 43 is disengaged from the unfolded locking hole 81, so that the first connecting structure and the second connecting structure can continue to move beyond the first preset angle range; similarly, when the relative rotation angle of the first structure and the second structure reaches the second preset angle range, the tail end of the pin 43 will be inserted into the folding locking hole 82, and the hole wall of the folding locking hole 82 can interfere with the pin 43, thereby preventing the first connecting structure and the second connecting structure from exceeding the second preset angle range. When the foldable frame is folded, the latch 43 is automatically engaged with the folding locking hole 81, and the latch 43 is released; the foldable frame is continued to be folded until the foldable frame is fully folded, and the latch 43 is automatically engaged with the folding locking hole 81, and the state of the foldable frame is switched. The user operation is very convenient.

[0053] It can be seen from the above description that when the first connecting structure and the second connecting structure continue to rotate relative to each other, and the relative rotation angle needs to exceed the first preset angle range, the relative rotation movement of the first connecting structure and the second connecting structure cannot continue due to the position restriction of the hole wall of the deployment locking hole 81 (the hole wall located in the circumferential direction of the deployment locking hole 81 with reference to the axis of the pivot shaft). Therefore, further, the left value and the right value of the first preset angle range are different. When the foldable frame is in the deployed state, the first connecting structure and the second connecting structure can still rotate relative to each other within a small range of angles; this numerical definition is expressed in the physical structure as follows: with reference to the axis of the pivot shaft, the circumferential dimension of the deployment locking hole is greater than the radial dimension of the pin.

[0054] Furthermore, in the embodiment of the present invention, the axis 92 of the pivot shaft and the axis of the center axle mounting hole 91 are not parallel, but when the foldable frame is assembled into a complete vehicle, the front frame 1 and the rear frame 2 are folded via the first connecting structure 41 and the second connecting structure 42, and the front wheel assembly and the rear wheel assembly can be offset from each other, further reducing the space occupied by the folded foldable vehicle and improving the portability of the foldable vehicle. Generally, the relative angle between the axis 92 of the pivot shaft and the axis of the center axle mounting hole 91 is less than or equal to 45 degrees.

[0055] Correspondingly, when the left value and the right value of the first preset angle range or the second preset angle range are equal, when the foldable frame is in the unfolded state or the folded state, the relative rotation angle of the first connecting structure and the second connecting structure cannot be changed, and the front frame and the rear frame are completely locked and cannot move relative to each other.

[0056] Furthermore, in the embodiment of the present invention, the front frame 1 further includes an upper tube 102 and a seat tube 105 , one end of the seat tube 105 is connected to the first fixed end 47 , and the other end of the seat tube 47 is connected to the upper tube 102 .

[0057] Furthermore, a seat post mounting structure 104 is provided at one end of the seat tube 47 away from the first fixed end 47. When a user uses the foldable frame, the weight of the human body can be transferred to the first connecting structure through the seat tube 47 in a nearly vertical direction. Combined with the accompanying drawings, the axial direction of the seat tube 47 is very close to the axial direction of the pivot shaft, and the lever arm is short, which can optimize the force condition of the pivot shaft and improve the durability of the pivot shaft.

[0058] Furthermore, the front frame also includes a connecting tube 103; one end of the connecting tube 103 is connected to the first fixed end 47, and the other end of the connecting tube 103 is connected to the upper tube 102. The upper tube 102, the connecting tube 103 and the seat tube 105 form a relatively stable triangular structure, which is beneficial to improving the overall rigidity of the front frame.

[0059] Furthermore, a front wheel assembly mounting position 101 for mounting a front wheel mechanism such as a front fork or a head tube is provided at the front end of the upper tube 102, that is, the end of the upper tube 102 away from the pivot axis; the front wheel mechanism can be selected from existing front wheel mechanisms according to needs.

[0060] Furthermore, the rear frame 2 includes:

[0061] A first connecting plate 201 has a first connecting and fixing end and a first connecting and mounting end, wherein the first connecting and fixing end is connected to the second fixing end 46;

[0062] A second connecting plate 202 has a second connecting and fixing end and a second connecting and mounting end, wherein the second connecting and fixing end is connected to the second fixing end 46;

[0063] The first connecting plate and the second connecting plate are respectively arranged side by side along the axial direction of the center shaft mounting hole 45, and the rear wheel assembly mounting position is between the first connecting mounting end and the second connecting mounting end, and the first connecting mounting end and the second connecting mounting end are used for the installation of the rear wheel assembly.

[0064] Specifically, in combination with the accompanying drawings, according to the design structure of the second connecting structure of the embodiment of the present invention, the rear frame of the embodiment of the present invention is composed of a first connecting plate 201 and a second connecting plate 202, and the front end of the first connecting plate 201 (the first connecting and fixing end, that is, the end close to the center shaft mounting hole) and the front end of the second connecting plate 202 (the second connecting and fixing end, that is, the end close to the center shaft mounting hole) are respectively arranged on both sides of the axial direction of the center shaft mounting hole 45 of the second connecting structure. Accordingly, there is a certain spacing distance between the first connecting structure plate and the second connecting structure plate, and the rear end of the first connecting structure plate (the first connecting and mounting end, that is, the end away from the center shaft mounting hole) and the rear end of the second connecting structure plate (the second connecting and mounting end, that is, the end away from the center shaft mounting hole) correspondingly form a space for installing the rear wheel assembly.

[0065] Furthermore, the rear frame 2 further includes a reinforcement plate 203 ; the reinforcement plate 203 is respectively connected and fixed to the first connecting plate 201 and the second connecting plate 202 to improve the overall rigidity of the rear frame 2 .

[0066] Furthermore, the foldable price difference also includes a shock-absorbing spring 3;

[0067] One end of the shock-absorbing spring 3 is fixedly connected to the front frame 1, and when the relative posture of the front frame 1 and the rear frame 2 is in an unfolded state, the other end of the shock-absorbing spring 3 abuts against the rear frame;

[0068] Alternatively, one end of the shock absorbing spring 3 is fixedly connected to the rear frame 1 , and when the relative posture of the front frame 1 and the rear frame 2 is in the unfolded state, the other end of the shock absorbing spring 3 abuts against the front frame 1 .

[0069] In the embodiment of the present invention, in combination with the actual structures of the front frame and the rear frame, the position where the front frame 1 interacts with the shock-absorbing spring 3 is the seat tube 105 , and the position where the rear frame 2 interacts with the shock-absorbing spring 3 is the reinforcement plate 203 .

[0070] Further integration Figure 7 and Figure 8 In the illustrated embodiment, after the upper end of the latch 43 extends out of the first connecting structure 41, the latch 43 is pulled to selectively insert the lower end of the latch 43 into the deployment locking hole 81 or the folding locking hole 82 provided on the second connecting structure 42, thereby locking the frame in the deployed or folded state. To facilitate user operation of the latch 43 to switch the frame between the deployed and folded states on demand, a pull wire 109 is fixed to the upper end of the latch 43 in this embodiment. The pull wire 109 extends to the front frame 1 and even the handlebar assembly 304, allowing the user to pull the latch 43 via the pull wire 109 to switch the frame between the deployed and folded states as needed during use.

[0071] A positioning bracket 441 is provided on the first connecting structure 41. The upper end of the pin 43 passes through the positioning bracket 441 and is connected to the pull wire 109, ensuring that the pin 43 is not easily stuck when operating it through the pull wire 109, which is conducive to improving the reliability of operating the pin 43 using the pull wire 109.

[0072] Figure 9 3D schematic diagram of the folding bicycle of an embodiment of the present invention. Accordingly, the present invention further provides a folding bicycle comprising the aforementioned foldable frame. Specifically, in combination with the basic structure of the folding bicycle and the aforementioned structural description of the foldable frame, in the embodiment of the present invention, the folding bicycle further comprises a center axle assembly 302, a front wheel assembly 303, a rear wheel assembly 301, a seat post assembly, and a handlebar assembly 304, wherein the center axle assembly 302 is mounted on the center axle mounting hole on the second connecting structural member, the rear wheel assembly 301 is disposed at the rear wheel assembly mounting position between the first connecting mounting end and the second connecting mounting end, the front wheel assembly 303 and the handlebar assembly 304 are mounted on the front wheel assembly mounting position of the front frame, and the seat post assembly is mounted on the seat tube.

[0073] It should be noted that the foldable frame of the embodiment of the present invention is suitable for bicycles, electric power-assisted bicycles, electric bicycles and other models. Accordingly, the folding vehicle of the embodiment of the present invention can be a bicycle, electric power-assisted bicycle, electric bicycle and other models.

[0074] In summary, the present invention provides a foldable frame and a foldable bicycle. When the user needs to switch the state of the foldable frame, such as switching the foldable frame from the folded state to the unfolded state, he only needs to pull the pin and unfold the foldable frame. When the pin is out of engagement with the folding locking hole, the pin can be released; the foldable frame is continued to be unfolded until the foldable frame is fully unfolded, and the pin will automatically fall into the unfolding locking hole under the drive of the elastic member, and the state of the foldable frame is switched. If the foldable frame needs to be switched from the unfolded state to the folded state, he only needs to pull the pin and fold the foldable frame. When the pin is out of engagement with the unfolding locking hole, the pin can be released; the foldable frame is continued to be folded until the foldable frame is fully folded, and the pin will automatically fall into the folding locking hole under the drive of the elastic member, and the state of the foldable frame is switched. The user operation is very convenient.

[0075] The present invention provides a foldable frame and a foldable bicycle, comprising a front frame connected to a first connecting member and a rear frame connected to a second connecting member, a pivot shaft, and a locking assembly. The first connecting member and the second connecting member are pivotally connected via the pivot shaft. Based on the pivotal connection between the first and second connecting members, the front and rear frames rotate relative to each other about the pivot shaft within a preset range of travel and are locked in either an unfolded state or a folded state by the locking assembly. By improving the design of the locking assembly, the first connecting member, and the second connecting member, the foldable frame facilitates state switching, providing excellent convenience and practicality.

[0076] The foldable frame and folding bicycle provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A foldable frame, comprising a front frame and a rear frame, characterized in that: Also includes: A first connecting structural member includes a first fixed end and a first pivot end, wherein the first fixed end is connected and fixed to the front frame; A second connecting structural member includes a second fixed end, a second pivot end, and a center shaft mounting hole, wherein the second fixed end is connected and fixed to the rear frame, and an axis of the second pivot end and an axis of the center shaft mounting hole are not coaxial; A pivot shaft, wherein the first pivot end and the second pivot end are respectively pivotally connected to the pivot shaft, and the first connecting structure and the second connecting structure rotate relative to each other within a preset range of travel with the pivot shaft as a rotation axis; A locking assembly comprising a latch hole provided on the first connecting structure, an elastic member and a latch provided in the latch hole, and an unfolded locking hole and a folded locking hole provided on the second connecting structure; During the relative rotation of the first connecting structure and the second connecting structure, the latch is driven by the elastic member to abut against the surface of the second connecting structure; When the relative rotation angle of the first connecting structure and the second connecting structure is within a first preset angle range, the relative posture of the front frame and the rear frame is in an unfolded state, and the latch is driven by the elastic member to be inserted into the unfolded locking hole; When the relative rotation angle of the first connecting structure and the second connecting structure is within a second preset angle range, the relative posture of the front frame and the rear frame is a folded state, and the latch is driven by the elastic member to be inserted into the folding locking hole.

2. The foldable frame according to claim 1, wherein: The front frame further includes an upper tube and a seat tube, one end of the seat tube is connected to the first fixed end, and the other end of the seat tube is connected to the upper tube.

3. The foldable frame according to claim 2, wherein: A seat post mounting structure is provided at one end of the riser away from the first fixed end.

4. The foldable frame according to claim 2, wherein: The front frame further includes a connecting tube; one end of the connecting tube is connected to the first fixed end, and the other end of the connecting tube is connected to the upper tube.

5. The foldable frame according to claim 1, wherein: The rear frame comprises: A first connecting plate having a first connecting fixing end and a first connecting mounting end, wherein the first connecting fixing end is connected to the second fixing end; a second connecting plate having a second connecting and fixing end and a second connecting and mounting end, wherein the second connecting and fixing end is connected to the second fixing end; The first connecting plate and the second connecting plate are respectively arranged side by side along the axial direction of the center shaft mounting hole, and the rear wheel assembly mounting position is between the first connecting mounting end and the second connecting mounting end, and the first connecting mounting end and the second connecting mounting end are used for the installation of the rear wheel assembly.

6. The foldable frame according to claim 5, wherein: The rear frame further includes a reinforcing plate; the reinforcing plate is respectively connected and fixed to the first connecting plate and the second connecting plate.

7. The foldable frame according to claim 6, wherein: Also includes shock springs; One end of the shock-absorbing spring is fixedly connected to the front frame, and when the relative posture of the front frame and the rear frame is in an unfolded state, the other end of the shock-absorbing spring abuts against the rear frame; Or one end of the shock-absorbing spring is fixedly connected to the rear frame, and when the relative posture of the front frame and the rear frame is in the unfolded state, the other end of the shock-absorbing spring abuts against the front frame.

8. The foldable frame according to claim 1, wherein: The left value and the right value of the first preset angle range are different; with the axis of the pivot shaft as a reference, the circumferential dimension of the expansion locking hole is greater than the radial dimension of the pin.

9. The foldable frame according to any one of claims 1 to 8, characterized in that: A positioning bracket is provided on the first connecting structure, and the upper end of the latch passes through the positioning bracket; a pull wire is also included which is fixedly connected to the upper end of the latch, so that the latch can be operated by the pull wire.

10. A folding bicycle, characterized in that: A foldable frame comprising the foldable frame according to any one of claims 1 to 9.

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