A two-wheeled vehicle that can be towed or carried on the back when folded.

Abstract

The present invention discloses a two-wheeled vehicle that can be towed or carried on the back after being folded, comprising a main frame, a sub-frame fixedly connected to the main frame, a front wheel fork assembly installed at the front end portion of the main frame, and a rear wheel fork assembly installed at the rear end portion of the main frame, wherein the front wheel fork assembly comprises a front wheel fork and a front wheel rotatably connected to the front wheel fork, and the front wheel fork comprises a front sleeve rotatable and lockable with the main frame, and a handlebar fixedly connected to the front sleeve. The present invention forms a storage space for storing the front wheel fork assembly on the main frame, and forms a storage space for storing the rear wheel between the main frame and the sub-frame, thereby greatly saving space after the folded two-wheeled vehicle that can be towed or carried on the back after being folded.

Description

Technical Field

[0001] The invention relates to a two-wheeled vehicle which can be towed or carried on the back after being folded. Background Art

[0002] Two-wheeled vehicles that can be folded and towed or carried on the back are widely used in cities because of their flexibility and can effectively avoid traffic jams. As users' requirements become higher and higher, higher requirements are also placed on the two-wheeled vehicles that can be folded and towed or carried on the back. How to make the two-wheeled vehicles that can be folded and towed or carried on the back foldable and thus portable is a problem that urgently needs to be solved. Summary of the invention

[0003] The object of the present invention is to provide a two-wheeled vehicle which is foldable, occupies a small space after being folded, can be towed or carried on the back after being folded.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a two-wheeled vehicle that can be towed or carried on the back after being folded, comprising a main frame, a sub-frame fixedly connected to the main frame, a front wheel fork assembly installed at the front end of the main frame, and a rear wheel fork assembly installed at the rear end of the main frame, the front wheel fork assembly comprising a front wheel fork and a front wheel rotatably connected to the front wheel fork, the front wheel fork comprising a front sleeve rotatable and lockable with the main frame, a handlebar fixedly connected to the front sleeve, a front lower fork frame sleeved with the front sleeve and capable of coaxial rotation and relative locking, and the front wheel The front lower fork frame is rotatably connected to the front lower fork frame, and the front lower fork frame and the front sleeve have an expanded and folded state. When the front lower fork frame and the front sleeve are expanded at the same time, the front sleeve extends toward the front and lower part of the main frame, and the rotation axis of the front lower fork frame and the front wheel is parallel to the rotation connection axis of the front sleeve and the main frame. When the front lower fork frame and the front sleeve are folded at the same time, the front sleeve is folded toward the main frame and is parallel to the main frame or forms an acute angle with the main frame, and the rotation axis of the front lower fork frame and the front wheel is perpendicular to or forms an acute angle with the rotation connection axis of the front sleeve and the main frame.

[0005] The rear wheel fork assembly comprises a rear sleeve which is rotatable and lockable with the main frame, a rear lower fork frame which is sleeved with the rear sleeve and can rotate coaxially and be locked relatively, the rear wheel is rotatably connected to the rear lower fork frame, the rear lower fork frame and the rear sleeve have expanded and folded states, when the rear lower fork frame and the rear sleeve are simultaneously expanded, the rear sleeve extends toward the rear lower part of the main frame, the rotating axis of the rear lower fork frame and the rear wheel is parallel to the rotating connection axis of the rear sleeve and the main frame, when the rear lower fork frame and the rear sleeve are simultaneously folded, the rear sleeve is rotated and folded toward the front upper part of the main frame and is parallel to or forms an acute angle with the main frame, the rotating axis of the rear lower fork frame and the rear wheel is perpendicular to or forms an acute angle with the rotating connection axis of the rear sleeve and the main frame.

[0006] Optimally, a first clearance groove is provided in the middle of the main frame, and when the front lower fork frame and the front sleeve are folded at the same time, the front lower fork frame, the front sleeve and the front wheel are located in the first clearance groove.

[0007] Optimally, the front wheel fork includes a front folding locking portion which locks and unlocks the front sleeve relative to the main frame, the front sleeve is provided with a first slot, the front folding locking portion includes a first locking pin which is slidably connected to the main frame, and a first elastic member which is used to ensure that the first locking pin always has a tendency to move toward the first slot, when the first locking pin exits the first slot, the front sleeve can be flipped and folded relative to the main frame, and when the first locking pin is inserted into the first slot, the front sleeve can be fixed relative to the main frame and be in an open state.

[0008] Optimally, the front wheel fork includes a front rotation locking portion which relatively locks and unlocks the front sleeve and the front lower fork frame, the front rotation locking portion includes a flower shaft sleeve fixedly arranged in the front sleeve, a flower shaft which matches the flower shaft sleeve and is inserted into the flower shaft sleeve, and a lever installed on the front sleeve for locking and disengaging the flower shaft and the flower shaft sleeve, the flower shaft sleeve is fixedly connected to the handlebar, and the flower shaft is fixedly connected to the front lower fork frame, when the lever is unlocked, the teeth of the flower shaft slide out of the tooth groove in the flower shaft sleeve, and the flower shaft is rotationally connected to the flower shaft sleeve, and when the lever is locked, the teeth of the flower shaft mesh with the tooth groove in the flower shaft sleeve, and the flower shaft is fixedly connected to the flower shaft sleeve.

[0009] Optimized, the auxiliary frame includes auxiliary support rods whose two ends are respectively connected to the two ends of the main frame, a seat cushion assembly installed on the auxiliary support rod, and the seat cushion assembly includes an auxiliary upper support rod whose front end is rotatably connected to the front end of the main frame and is retractable and can also fix its length; an auxiliary lower support rod which is foldable and whose two ends are respectively rotatably connected to the rear end of the main frame and the rear end of the auxiliary upper support rod; a auxiliary locking part for locking the auxiliary lower support rod when it is unfolded; a seat cushion and a backrest arranged on the auxiliary upper support rod; the seat cushion assembly has a folded and unfolded state, when the seat cushion assembly is unfolded, the auxiliary upper support rod is extended, the auxiliary lower support rod is unfolded and the auxiliary locking part is in a locked state, when the seat cushion assembly is folded, the auxiliary upper support rod is contracted, the auxiliary lower support rod is folded and is parallel to the auxiliary support rod or has an acute angle with it.

[0010] Furthermore, the secondary upper support rod includes a secondary upper outer sleeve, a limiting inner pull rod coaxially arranged with the secondary upper outer sleeve and fixed in the secondary upper outer sleeve, and a telescopic cross bar beam sleeved in the limiting inner pull rod and passing through the secondary upper outer sleeve, and the seat cushion and backrest are installed on the telescopic cross bar beam.

[0011] Furthermore, the sub-lower support rod includes a sub-lower first folding rod hinged to the telescopic cross bar beam, a sub-lower second folding rod hinged to the sub-support rod, and a middle folding locking portion, and the middle folding locking portion has two states, locked and unlocked. When the middle folding locking portion is locked, the sub-lower first folding rod and the sub-lower second folding rod are unfolded and locked, and when the middle folding locking portion is unlocked, the sub-lower first folding rod and the sub-lower second folding rod can be folded relative to each other.

[0012] Furthermore, the rear wheel fork assembly includes a rear folding locking portion for locking and unlocking the rear sleeve and the main frame relative to each other, the rear sleeve is provided with a second slot, and the rear folding locking portion includes a second locking pin slidably connected to the main frame, and a second elastic member used to ensure that the second locking pin always has a tendency to move toward the second slot, when the second locking pin exits the second slot, the rear sleeve can be flipped and folded relative to the main frame, and when the second locking pin is inserted into the second slot, the rear sleeve can be fixed relative to the main frame and be in an open state.

[0013] Furthermore, the rear wheel fork assembly includes a rear rotation locking part for relatively locking and unlocking the rear sleeve and the rear lower fork frame, the rear rotation locking part includes a flower shaft sleeve fixedly arranged in the rear sleeve, a flower shaft matching the flower shaft sleeve and inserted in the flower shaft sleeve, and a lever installed on the rear sleeve for locking and disengaging the flower shaft and the flower shaft sleeve, the flower shaft sleeve is fixedly connected to the main frame, and the flower shaft is fixedly connected to the rear lower fork frame, when the lever is unlocked, the teeth of the flower shaft slide out of the tooth groove in the flower shaft sleeve, and the flower shaft is rotationally connected to the flower shaft sleeve, and when the lever is locked, the teeth of the flower shaft engage with the tooth groove in the flower shaft sleeve, and the flower shaft is fixedly connected to the flower shaft sleeve.

[0014] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the present invention forms a storage space for storing the front wheel fork assembly on the main frame, the four ends connecting the sub-frame and the main frame are bent, and the two are spliced ​​to form a hexagon, and a storage space for storing the rear wheel is formed between the main frame and the sub-frame, which greatly saves the space after the folded two-wheeled vehicle that can be towed or carried on the back is folded. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a schematic diagram of the present invention in Example 1;

[0016] Attached Figure 2 , 3 They are schematic diagrams of the front rotation locking assembly in the first embodiment when locked and unlocked respectively;

[0017] Attached Figure 4 , 5 They are schematic diagrams of the mechanism of the two-wheeled vehicle that can be towed or carried on the back after being folded in the first embodiment when being carried on the back and towed;

[0018] Attached Figure 6 , 7 They are schematic diagrams of the structure of the two-wheeled vehicle that can be towed or carried on the back after folding and its rear folding locking part in the second embodiment;

[0019] Attached Figure 8 , 11 12 is a schematic diagram of the structure of the flower axis and the flower axis sleeve in Examples 1 and 2;

[0020] Attached Fig. 9 It is a schematic diagram of the structure of the front wheel fork or the rear wheel fork in the third embodiment;

[0021] Attached Fig.10 It is a schematic diagram of the structure of the front wheel fork or the rear wheel fork in the fourth embodiment. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] like Figure 1 As shown, the two-wheeled vehicle that can be towed or carried on the back after folding comprises a main frame 1, a sub-frame 2 fixedly connected to the main frame 1, a front wheel fork assembly 3 installed at the front end of the main frame 1, and a rear wheel fork assembly 4 installed at the rear end of the main frame 1. The two-wheeled vehicle can be an electric vehicle or a fuel-powered vehicle.

[0028] The front wheel fork assembly 3 includes a front wheel fork 5 and a front wheel 6 rotatably connected to the front wheel fork 5, the front wheel fork 5 includes a front sleeve 7 rotatable and lockable with the main frame 1, a handlebar 8 fixedly connected to the front sleeve 7, a front lower fork frame 9 sleeved with the front sleeve 7 and capable of coaxial rotation and relative locking, the front wheel 6 is rotatably connected to the front lower fork frame 9, the front lower fork frame 9 and the front sleeve 7 have an expanded and folded state, when the front lower fork frame 9 and the front sleeve 7 are simultaneously expanded, the front sleeve 7 extends toward the front and lower part of the main frame 1, the rotation axis of the front lower fork frame 9 and the front wheel 6 is parallel to the rotation connection axis of the front sleeve 7 and the main frame 1, when the front lower fork frame 9 and the front sleeve 7 are simultaneously folded, the front sleeve 7 is folded toward the main frame 1 and is parallel to the main frame 1 or forms an acute angle with the main frame 1, and the rotation axis of the front lower fork frame 9 and the front wheel 6 is perpendicular to or forms an acute angle with the rotation connection axis of the front sleeve 7 and the main frame 1.

[0029] A first clearance groove 10 is provided in the middle of the main frame 1 . When the front lower fork frame 9 and the front sleeve 7 are folded simultaneously, the front lower fork frame 9 , the front sleeve 7 and the front wheel 6 are located in the first clearance groove 10 .

[0030] The front wheel fork 5 includes a front folding locking portion 11 for locking and unlocking the front sleeve 7 relative to the main frame 1. A first slot 12 is provided on the front sleeve 7. The front folding locking portion 11 includes a first locking pin 13 slidably connected to the main frame 1, and a first elastic member 14 for ensuring that the first locking pin 13 always has a tendency to move toward the first slot 12. When the first locking pin 13 exits the first slot 12, the front sleeve 7 can be flipped and folded relative to the main frame 1. When the first locking pin 13 is inserted into the first slot 12, the front sleeve 7 is fixed relative to the main frame 1 and is in an open state.

[0031] like Figure 2 As shown in / 3, the front wheel fork 5 includes a front rotating locking part 15 which relatively locks and unlocks the front sleeve 7 and the front lower fork frame 9. The front rotating locking part 15 includes a flower shaft sleeve 17 fixedly arranged in the front sleeve 7, a flower shaft 16 which matches the flower shaft sleeve 17 and is inserted into the flower shaft sleeve 17, a tightening screw 163 which is arranged in the flower shaft sleeve 17 and fixedly connected to the flower shaft 16, and a flower shaft spring 162 which is arranged between the tightening screw 163 and the flower shaft sleeve 17, one end of the flower shaft spring 162 is fixed on the tightening screw 163 and the other end of which is fixed with an inner limit ring 165, and the inner limit ring 165 is pressed against an annular shoulder 172 in the flower shaft sleeve 17. The flower shaft spring 162 makes the flower shaft 16 always have a tendency to move toward the flower shaft sleeve 17, and the buckle 18 installed on the front sleeve 7 is used to lock and disengage the flower shaft 16 and the flower shaft sleeve 17. The flower shaft sleeve 17 is fixedly connected to the handlebar 8, and the flower shaft 16 is fixedly connected to the front lower fork frame 9. Figure 2 / 3, the pull button 18 is rotatably connected to the outer wall of the front sleeve 7, and a push plate 181 is rotatably connected thereto. The lower end of the push plate 181 is rotatably connected to a U-shaped connecting plate 182. The flower shaft 16 has a boss 164, which abuts against the circumference of the through hole in the middle of the U-shaped connecting plate 182 and is fixedly connected to the front lower fork frame 9. In order to make the rotation smoother, a plane bearing 91 is connected between the boss 164 and the flat plate in the middle of the U-shaped connecting plate 182. The boss 164 and the flat bearing 91 are located on the same side of the flat plate in the middle of the U-shaped connecting plate 182, and the flower shaft sleeve 17 is located on the other side of the flat plate in the middle of the U-shaped connecting plate 182. When the lever 18 is unlocked, it flips downward, and the push plate 181 pushes the U-shaped connecting plate 182 downward until the teeth 161 of the flower shaft 16 slide out of the tooth groove 171 of the flower shaft sleeve 17. At this time, the flower shaft 16 is rotationally connected with the flower shaft sleeve 17. When it needs to be locked, the flower shaft 16 moves inward and outward of the flower shaft sleeve 1 under the action of the flower shaft spring 162 until the lever 18 is locked, and the teeth 161 of the flower shaft 16 are engaged with the tooth groove 171 of the flower shaft sleeve 17, and the flower shaft 16 is fixedly connected with the flower shaft sleeve 17. The teeth of the flower shaft 16 can be single teeth or multiple teeth. When the teeth of the flower shaft 16 are single teeth, the tooth groove of the flower shaft sleeve 17 has one more tooth than the teeth of the flower shaft 16. The rotation angle range of the flower shaft 16 is 0°-180°, which is also the rotation angle range of the front lower fork frame and the rear lower fork frame.

[0032] The rear wheel fork assembly 4 includes a rear sleeve 19 which is rotatable and lockable with the main frame 1, a rear lower fork frame 20 which is sleeved with the rear sleeve 19 and can rotate coaxially and be relatively locked, and a rear wheel 41. The rear wheel 41 is rotatably connected to the rear lower fork frame 20. The rear lower fork frame 20 and the rear sleeve 19 have an expanded and folded state. When the rear lower fork frame 20 and the rear sleeve 19 are simultaneously expanded, the rear sleeve 19 extends toward the rear lower part of the main frame 1, and the rotation axis of the rear lower fork frame 20 and the rear wheel is parallel to the rotation connection axis of the rear sleeve 19 and the main frame 1. When the rear lower fork frame 20 and the rear sleeve 19 are simultaneously folded, the rear sleeve 19 is rotated and folded toward the front upper part of the main frame 1 and is parallel to or forms an acute angle with the main frame 1. The rotation axis of the rear lower fork frame 20 and the rear wheel is perpendicular to or forms an acute angle with the rotation connection axis of the rear sleeve 19 and the main frame 1.

[0033] The auxiliary frame 2 includes an auxiliary support rod 21 whose two ends are respectively connected to the two ends of the main frame 1, and a seat cushion assembly 22 installed on the auxiliary support rod 21. The seat cushion assembly 22 includes an auxiliary upper support rod 23 whose front end is rotatably connected to the front end of the main frame 1 and is retractable and can fix the length; a foldable auxiliary lower support rod 24 whose two ends are rotatably connected to the rear end of the main frame 1 and the rear end of the auxiliary upper support rod 23; a secondary locking part used to lock the auxiliary lower support rod 24 when it is unfolded; a seat cushion 28 and a backrest 29 provided on the auxiliary upper support rod 23; the seat cushion assembly 22 has a folded and unfolded state. When the seat cushion assembly 22 is unfolded, the auxiliary upper support rod 23 is extended, the auxiliary lower support rod 24 is unfolded and the auxiliary locking part is in a locked state. When the seat cushion assembly 22 is folded, the auxiliary upper support rod 23 is contracted, and the auxiliary lower support rod 24 is folded and parallel to the auxiliary support rod 21 or at an acute angle.

[0034] The auxiliary upper support rod 23 includes an auxiliary upper outer sleeve 25, a limiting inner pull rod 26 coaxially arranged with the auxiliary upper outer sleeve 25 and fixed in the auxiliary upper outer sleeve 25, a telescopic cross bar beam 27 sleeved in the limiting inner pull rod 26 and passing through the auxiliary upper outer sleeve 25, and a seat cushion 28 and a backrest 29 are installed on the telescopic cross bar beam 27.

[0035] The auxiliary lower support rod 24 includes a auxiliary lower first folding rod 30 hinged to the telescopic cross bar beam, a auxiliary lower second folding rod 31 hinged to the auxiliary support rod 21, and a middle folding locking portion 32. The middle folding locking portion 32 has two states: locked and unlocked. When the middle folding locking portion 32 is locked, the auxiliary lower first folding rod 30 and the auxiliary lower second folding rod 31 are unfolded and locked. When the middle folding locking portion 32 is unlocked, the auxiliary lower first folding rod 30 and the auxiliary lower second folding rod 31 can be folded relative to each other. The middle folding locking portion 32 includes a first sliding sleeve 33 fixed to the sub-lower first folding rod 30, a sliding locking pin 35 inserted into the first sliding sleeve 33, and a second sliding sleeve 34 fixedly connected to the sub-lower second folding rod 31, so that the sliding locking pin 35 has a sliding spring 36 that tends to slide toward the second sliding sleeve 34. When the sliding locking pin 35 slides out of the second sliding sleeve 34, the sub-lower first folding rod 30 and the sub-lower second folding rod 31 can be relatively folded. When the sliding locking pin 35 is inserted into the second sliding sleeve 34, the sub-lower first folding rod 30 and the sub-lower second folding rod 31 are unfolded and relatively locked.

[0036] The rear wheel fork assembly includes a rear folding locking portion for locking and unlocking the rear sleeve 19 relative to the main frame 1. A second slot 42 is provided on the rear sleeve 19. The rear folding locking portion includes a second locking pin 43 slidably connected to the main frame 1, and a second elastic member 44 for ensuring that the second locking pin always has a tendency to move toward the second slot. When the second locking pin exits the second slot, the rear sleeve 19 can be flipped and folded relative to the main frame 1. When the second locking pin is inserted into the second slot, the rear sleeve 19 is fixed relative to the main frame 1 and is in an open state.

[0037] The rear wheel fork assembly includes a rear rotation locking portion 36 for relatively locking and unlocking the rear sleeve 19 and the rear lower fork frame 20. The rear rotation locking portion 36 has the same principle as the front rotation locking portion 15, and includes a flower shaft sleeve 17 fixedly arranged in the rear sleeve 19, a flower shaft 16 matching the flower shaft sleeve 17 and inserted into the flower shaft sleeve 17, a tightening screw 163 arranged in the flower shaft sleeve 17 and fixedly connected to the flower shaft 16, and a flower shaft spring 162 arranged between the tightening screw 163 and the flower shaft sleeve 17, one end of the flower shaft spring 162 is fixed on the tightening screw 163 and the other end is fixed with an inner limit ring 165, and the inner limit ring 165 is pressed against an annular shoulder 172 in the flower shaft sleeve 17. The flower shaft spring 162 makes the flower shaft 16 always have a tendency to move toward the flower shaft sleeve 17, and the buckle 18 installed on the front sleeve 7 is used to lock and disengage the flower shaft 16 and the flower shaft sleeve 17. The flower shaft sleeve 17 is fixedly connected to the handlebar 8, and the flower shaft 16 is fixedly connected to the front lower fork frame 9. Figure 7 As shown, the pull button 18 is rotatably connected to the outer side wall of the rear sleeve 19, and a push plate 181 is rotatably connected thereto. The lower end of the push plate 181 is rotatably connected to a U-shaped connecting plate 182. The flower shaft 16 has a boss 164, which abuts against the circumference of the through hole in the middle of the U-shaped connecting plate 182 and is fixedly connected to the front lower fork frame 9. In order to make the rotation smoother, a plane bearing 91 is connected between the boss 164 and the flat plate in the middle of the U-shaped connecting plate 182. The boss 164 and the flat bearing 91 are located on the same side of the flat plate in the middle of the U-shaped connecting plate 182, and the flower shaft sleeve 17 is located on the other side of the flat plate in the middle of the U-shaped connecting plate 182. When the pull button 18 is unlocked, the pull button 18 flips downward, and the push plate 181 pushes the U-shaped connecting plate 182 downward until the tooth 161 of the flower shaft 16 slides out of the tooth groove 171 of the flower shaft sleeve 17. At this time, the flower shaft 16 is rotatably connected with the flower shaft sleeve 17. When it needs to be locked, the flower shaft 16 moves inward and outward of the flower shaft sleeve 1 under the action of the flower shaft spring 162 until the pull button 18 is locked, and the tooth of the flower shaft 16 is engaged with the tooth groove of the flower shaft sleeve 17, and the flower shaft 16 is fixedly connected with the flower shaft sleeve 17. The tooth of the flower shaft 16 can be a single tooth or multiple teeth. When the tooth of the flower shaft 16 is a single tooth, the tooth groove of the flower shaft sleeve 17 has one more tooth than the tooth of the flower shaft 16.

[0038] The main frame 1 is also provided with a folding footrest 37 having two states of folding and extending and a footrest groove 45 for accommodating the folding footrest. The handlebar 8 is a retractable handlebar 8. All acute angles are less than 10°. A small wheel 38 is provided at the rear end of the main frame 1 for folding the two-wheeled vehicle that can be towed or carried on the back when folded, and the small wheel 38 can be folded. A backrest 40 is provided on the lower end surface of the main frame 1 for carrying the vehicle on the back. A battery pack 39 of the two-wheeled vehicle that can be towed or carried on the back after folding is provided on the front lower fork frame.

[0039] like Figure 4 As shown in / 5, the two-wheeled vehicle can be towed or carried on the back after being folded.

[0040] Embodiment 2

[0041] like Figure 6 , 7 As shown, the difference between this embodiment and the first embodiment is that: in this embodiment, the unlocking method of the rear sleeve and the main frame is different. In order to improve the shock absorption effect, the rear folding locking part includes a rear sleeve rotating tube 46 fixed to the rear sleeve 19 and rotatably connected to the rear end of the main frame 1, a rear sleeve unlocking block 47 fixed to the rear sleeve rotating tube 46, a rear sleeve unlocking pin 48 telescopically inserted on the rear sleeve unlocking block 47, a shock absorption mounting rod 410 fixed to the secondary support rod 21, and a shock absorption rod 49 whose two ends are respectively fixedly connected to the rear sleeve unlocking block 47 and the shock absorption mounting rod 410 and which is telescopic. , a shock absorber spring 40 is sleeved on the shock absorber rod 49, and the two ends of the shock absorber spring 40 are respectively against the rear sleeve unlocking block 47 and the shock absorber mounting rod 410. The main frame 1 is divided into two left and right pieces, and a space for accommodating the front wheel is formed between the left piece 01 and the right piece 02. A rear sleeve unlocking shaft 411 is fixed between the rear ends of the left piece 01 and the right piece 02, and a locking hole is opened on the rear sleeve unlocking shaft. When the rear sleeve unlocking pin 48 is inserted into the locking hole, the rear sleeve 19 is fixed relative to the main frame 1 and is in an open state, and the rear sleeve 19 then sleeves the swing of the rotating tube 46 and the buffering of the shock absorber spring 40 to achieve shock absorption.

[0042] Embodiment 3

[0043] The difference between this embodiment and the first embodiment is that: Fig. 9 As shown, the front rotation locking portion 15 can also be a front locking plate 1501 rotatably connected to a front sleeve with a locking hole and a front locking block 1502 provided on the front lower fork frame. When the front locking plate 1501 is buckled on the front locking block 1502, the front lower fork frame and the front sleeve are relatively fixed, otherwise the two can rotate relatively, and the rotation angle range of the front lower fork frame is 0°-180°. The rear rotation locking portion 36 can also be the above-mentioned form.

[0044] Embodiment 4

[0045] The difference between this embodiment and the first embodiment is that: Fig.10 As shown, the front rotation locking part 15 can also be a front sleeve 7 and a front lower wheel fork 9 that are connected together, and unlocking and fixing are achieved through a through hole opened on both and a locking bolt 03 passing through the through hole, and the rotation angle range of the front lower fork frame is 0°-180°. The rear rotation locking part 36 can also be the above-mentioned form.

[0046] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-wheeled vehicle that can be towed or carried on the back after being folded, comprising a main frame, a sub-frame fixedly connected to the main frame, a front wheel fork assembly installed at the front end of the main frame, and a rear wheel fork assembly installed at the rear end of the main frame, wherein the front wheel fork assembly comprises a front wheel fork and a front wheel rotatably connected to the front wheel fork, characterized in that: The front wheel fork comprises a front sleeve which is rotatable and lockable with the main frame, a handlebar fixedly connected to the front sleeve, a front lower fork frame which is sleeved with the front sleeve and can rotate coaxially and be locked relatively, the front wheel is rotatably connected to the front lower fork frame, the front lower fork frame and the front sleeve have an expanded and folded state, when the front lower fork frame and the front sleeve are simultaneously expanded, the front sleeve extends toward the front lower part of the main frame, the rotation axis of the front lower fork frame and the front wheel is parallel to the rotation connection axis of the front sleeve and the main frame, when the front lower fork frame and the front sleeve are simultaneously folded, the front sleeve is folded toward the main frame and is parallel to or forms an acute angle with the main frame, and the rotation axis of the front lower fork frame and the front wheel is perpendicular or perpendicular to the rotation connection axis of the front sleeve and the main frame. The rear wheel fork assembly comprises a rear sleeve which is rotatable and lockable with the main frame, a rear lower fork frame which is sleeved with the rear sleeve and can rotate coaxially and be locked relative to each other, the rear wheel is rotatably connected to the rear lower fork frame, the rear lower fork frame and the rear sleeve have an expanded and folded state, when the rear lower fork frame and the rear sleeve are simultaneously expanded, the rear sleeve extends toward the rear lower part of the main frame, the rotating axis of the rear lower fork frame and the rear wheel is parallel to the rotating connection axis of the rear sleeve and the main frame, when the rear lower fork frame and the rear sleeve are simultaneously folded, the rear sleeve is rotated and folded toward the front upper part of the main frame and is parallel to the main frame or forms an acute angle, the rotating axis of the rear lower fork frame and the rear wheel is perpendicular to or forms an acute angle with the rotating connection axis of the rear sleeve and the main frame.

2. The two-wheeled vehicle that can be towed or carried on the back after being folded according to claim 1, characterized in that: A first clearance groove is provided in the middle of the main frame. When the front lower fork frame and the front sleeve are folded simultaneously, the front lower fork frame, the front sleeve and the front wheel are located in the first clearance groove.

3. The two-wheeled vehicle that can be towed or carried after folding according to claim 1, characterized in that: The front wheel fork includes a front folding locking portion that locks and unlocks the front sleeve relative to the main frame. The front sleeve is provided with a first slot. The front folding locking portion includes a first locking pin slidably connected to the main frame and a first elastic member used to ensure that the first locking pin always has a tendency to move toward the first slot. When the first locking pin exits the first slot, the front sleeve can be flipped and folded relative to the main frame. When the first locking pin is inserted into the first slot, the front sleeve is fixed relative to the main frame and is in an open state.

4. The foldable two-wheeled vehicle that can be towed or carried on the back according to claim 1, characterized in that: The front wheel fork includes a front rotation locking part which relatively locks and unlocks the front sleeve and the front lower fork frame, the front rotation locking part includes a flower shaft sleeve fixed in the front sleeve, a flower shaft which matches the flower shaft sleeve and is passed through the flower shaft sleeve, and a lever installed on the front sleeve for locking and disengaging the flower shaft and the flower shaft sleeve, the flower shaft sleeve is fixedly connected to the handlebar, and the flower shaft is fixedly connected to the front lower fork frame, when the lever is unlocked, the teeth of the flower shaft slide out of the tooth groove in the flower shaft sleeve, and the flower shaft is rotationally connected to the flower shaft sleeve, and when the lever is locked, the teeth of the flower shaft mesh with the tooth groove in the flower shaft sleeve, and the flower shaft is fixedly connected to the flower shaft sleeve.

5. The foldable two-wheeled vehicle that can be towed or carried on the back according to claim 1, characterized in that: The auxiliary frame includes an auxiliary support rod whose two ends are respectively connected to the two ends of the main frame, and a seat cushion assembly installed on the auxiliary support rod, wherein the seat cushion assembly includes an auxiliary upper support rod whose front end is rotatably connected to the front end of the main frame and can be retracted and fixed in length; and an auxiliary lower support rod which is foldable and whose two ends are respectively rotatably connected to the rear end of the main frame and the rear end of the auxiliary upper support rod; A secondary locking portion for locking the secondary lower support rod when it is deployed; A seat cushion and a backrest are arranged on the secondary upper support rod; the seat cushion assembly has a folded and unfolded state. When the seat cushion assembly is unfolded, the secondary upper support rod is extended, the secondary lower support rod is unfolded and the secondary locking portion is in a locked state. When the seat cushion assembly is folded, the secondary upper support rod is contracted, the secondary lower support rod is folded and is parallel to the secondary support rod or has an acute angle with it.

6. The two-wheeled vehicle that can be towed or carried on the back after being folded according to claim 5, characterized in that: The auxiliary upper support rod includes an auxiliary upper outer sleeve, a limiting inner pull rod coaxially arranged with the auxiliary upper outer sleeve and fixed in the auxiliary upper outer sleeve, and a telescopic cross bar beam sleeved in the limiting inner pull rod and passing through the auxiliary upper outer sleeve, and the seat cushion and backrest are installed on the telescopic cross bar beam.

7. The foldable two-wheeled vehicle that can be towed or carried on the back according to claim 6, characterized in that: The auxiliary lower support rod includes a auxiliary lower first folding rod hinged to the telescopic cross bar beam, a auxiliary lower second folding rod hinged to the auxiliary support rod and a middle folding locking part, the middle folding locking part has two states of locking and unlocking, when the middle folding locking part is locked, the auxiliary lower first folding rod and the auxiliary lower second folding rod are unfolded and locked, when the middle folding locking part is unlocked, the auxiliary lower first folding rod and the auxiliary lower second folding rod can be folded relative to each other.

8. The foldable two-wheeled vehicle that can be towed or carried on the back according to claim 1, characterized in that: The rear wheel fork assembly includes a rear folding locking portion for locking and unlocking the rear sleeve relative to the main frame, a second slot is provided on the rear sleeve, and the rear folding locking portion includes a second locking pin slidably connected to the main frame, and a second elastic member is used to make the second locking pin always have a movement tendency toward the second slot, when the second locking pin exits the second slot, the rear sleeve can be flipped and folded relative to the main frame, and when the second locking pin is inserted into the second slot, the rear sleeve is fixed relative to the main frame and is in an open state.

9. The foldable two-wheeled vehicle that can be towed or carried on the back according to claim 1, characterized in that: The rear wheel fork assembly includes a rear rotation locking part for relatively locking and unlocking the rear sleeve and the rear lower fork frame, the rear rotation locking part includes a flower shaft sleeve fixedly arranged in the rear sleeve, a flower shaft matching the flower shaft sleeve and inserted in the flower shaft sleeve, and a lever installed on the rear sleeve for locking and disengaging the flower shaft and the flower shaft sleeve, the flower shaft sleeve is fixedly connected to the main frame, and the flower shaft is fixedly connected to the rear lower fork frame, when the lever is unlocked, the teeth of the flower shaft slide out of the tooth groove in the flower shaft sleeve, and the flower shaft is rotationally connected to the flower shaft sleeve, and when the lever is locked, the teeth of the flower shaft engage with the tooth groove in the flower shaft sleeve, and the flower shaft is fixedly connected to the flower shaft sleeve.

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