Tricycle

Abstract

This application relates to a tricycle. The tricycle includes a vehicle body frame (10), a folding mechanism (70), two first wheels (20), one second wheel (30), and a caster assembly (80). The vehicle body frame (10) includes a first frame body (11) and a second frame body (12) connected to each other. The folding mechanism (70) connects the first frame body (11) and the second frame body (12). The first frame body (11) and the second frame body (12) are folded or unfolded by the folding mechanism (70). The two first wheels (20) are mounted on the first frame body (11). One second wheel (30) is mounted on the second frame body (12). The caster assembly (80) is mounted on the first frame body (11) or the second frame body (12) and can move relative to the second frame body (12) to switch between a first position and a second position.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of a Chinese patent application with application number 202210931522.8 and title "Three - wheel Bicycle" filed on August 4, 2022, and the entire content thereof is incorporated herein by reference.

[0002] This application relates to the technical field of bicycles, and more particularly to three - wheel bicycles.

Background Art

[0003] A bicycle is an environmentally friendly means of transportation powered by pedaling. Bicycles generally include two - wheel bicycles and three - wheel bicycles. Three - wheel bicycles are used for carrying goods and people and are widely used in daily life.

[0004] However, due to the large volume of the body of a three - wheel bicycle, it is necessary to occupy a large space during storage when not in use, which brings inconvenience to storage.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Based on this, in view of the problem that the storage of conventional three - wheel bicycles is inconvenient, it is necessary to provide a three - wheel bicycle that is convenient for storage.

Means for Solving the Problems

[0006] A three - wheel bicycle, comprising a body frame, a folding mechanism, a first wheel, a second wheel, and a caster assembly, wherein the body frame includes a first frame body and a second frame body connected to each other, the folding mechanism connects the first frame body and the second frame body, and the first frame body and the second frame body are folded or unfolded by the folding mechanism. The two first wheels are mounted on the first frame body. One of the second wheels is mounted on the second frame body. The caster assembly is mounted on the vehicle body frame and can move relative to the vehicle body frame to switch between a first position and a second position. The caster assembly includes casters. When the caster assembly is in the first position, the two first wheels and the second wheel together form a first support surface for supporting the tricycle. When the caster assembly is in the second position, the two first wheels and the casters together form a second support surface for supporting the tricycle.

[0007] In one embodiment, the first frame body includes a first main beam and a first fork. The first fork is hingedly connected to the first main beam. The first wheel is connected to the first fork. The tricycle further includes a cab, which is attached to the first fork. The second frame body includes a second main beam and a second fork connected to each other. The second wheel is connected to the second fork. The folding mechanism connects the first main beam and the second main beam.

[0008] In one embodiment, the first frame body further includes a first vertical tube connected to the first main beam. The tricycle includes a handle, which is rotatably provided on the first vertical tube.

[0009] In one embodiment, the tricycle further includes a quick release, which is connected to the first vertical tube and can be switched between a first state and a second state relative to the first vertical tube. When the quick release is in the first state, the quick release allows the handle to move relative to the first vertical tube. When the quick release is in the second state, the quick release restricts the handle from moving relative to the first vertical tube.

[0010] In one embodiment, the second frame body further includes a second vertical pipe, a connecting pipe, and a connecting portion. The second vertical pipe is connected to both the second main beam and the second fork. The connecting pipe is connected to both the second main beam and the second vertical pipe. The connecting portion is connected to the connecting pipe. The caster assembly is hinge-connected to the connecting portion. The tricycle further includes a saddle, and the saddle is attached to the second vertical pipe.

[0011] In one embodiment, when the tricycle is in a folded state, the first main beam and the second main beam are provided to form an acute angle, and the extending direction of the first main beam is inclined with respect to the extending direction of the axis of the first wheel.

[0012] In one embodiment, the tricycle further includes a cab, and the cab is attached to the first frame body. When the tricycle is in a deployed state, the lowest part of the cab is lower than the axial center position of the first wheel.

[0013] In one embodiment, the tricycle further includes a cab, and the cab is attached to the first frame body. The cab is removably connected to the first frame body. When the tricycle is in a folded state, the remaining part of the tricycle can be accommodated in the cab.

[0014] In one embodiment, the tricycle further includes a hinge shaft, the hinge shaft is connected to the first frame body or the second frame body, the caster assembly is hinge-connected to the first frame body or the second frame body via the hinge shaft, the caster assembly further includes a connecting shaft, a shaft sleeve, and an elastic member, one end of the connecting shaft is hinge-connected to the hinge shaft, the caster holder is rotatably provided at the other end of the connecting shaft, a position restricting protrusion is protruding on the outer surface of the connecting shaft, both the elastic member and the shaft sleeve are externally fitted outside the connecting shaft, the elastic member is provided in a compressed state between the shaft sleeve and the position restricting protrusion, when the caster assembly is in the first position and the second position, the shaft sleeve abuts against the second frame body and is position-restricted.

[0015] In one embodiment, the second frame body is provided with a first position restricting surface and a second position restricting surface, when the caster assembly is in the first position, the end surface of the shaft sleeve away from the elastic member abuts against the first position restricting surface, restricting the caster assembly from switching from the first position to the second position, when the caster assembly is in the second position, the end surface of the shaft sleeve away from the elastic member abuts against the second position restricting surface, restricting the caster assembly from switching from the second position to the first position.

[0016] In one embodiment, the first frame body includes a first main beam and a first fork, the first fork is hinge-connected to the first main beam, the first wheel is connected to the first fork, the second frame body includes a second main beam and a second fork connected to each other, the second wheel is connected to the second fork, and the folding mechanism connects the first main beam and the second main beam.

[0017] In one embodiment, the folding machine includes a first joint, a second joint, and a handle. The first joint is hingedly connected to the second joint, the handle is hingedly connected to the first joint or the second joint, the first joint is connected to the first main beam, and the second joint is connected to the second main beam.

[0018] In one embodiment, when the tricycle is in a folded state, the extending direction of the second main beam is substantially parallel to the extending direction of the axis of the first wheel.

[0019] In one embodiment, the first frame body further includes a first vertical pipe and an inclined support pipe. The first vertical pipe is connected to the first main beam, and the inclined support pipe is obliquely supported between the first main beam and the first vertical pipe.

[0020] In one embodiment, the second frame body further includes a second vertical pipe. The second vertical pipe is connected to the second main beam. The tricycle further includes a motor system, and the motor system is installed in an installation space formed by the second vertical pipe and the second main beam.

Brief Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required in the following description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only the embodiments of the present application, and those skilled in the art can also obtain the embodiments of other drawings based on the disclosed drawings without creative efforts.

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Mode for Carrying Out the Invention

[0022] Hereinafter, with reference to the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application shall fall within the scope of protection of the present application.

[0023] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "longitudinal direction", "lateral direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for simplifying the description of the present application, and does not indicate or imply that the mentioned device or component must have a specific orientation and be structured and operated in a specific orientation, so it cannot be understood as a limitation to the present application.

[0024] Note that the terms "first" and "second" are for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the specified technical features. Therefore, the features of "first" and "second" may include at least one of the corresponding features explicitly or implicitly. In the description of the present application, "a plurality" means at least two, for example, two, three, etc., unless otherwise specified.

[0025] In the present application, unless otherwise specified, terms such as "attach", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or integral, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or a communication inside two elements or an interaction relationship between two elements. A person skilled in the art can understand the specific meaning of the above terms in the present application based on the specific situation.

[0026] In the present application, unless otherwise specified, when the first feature is "above" or "below" the second feature, the first and second features may be in direct contact, or the first and second features may be indirectly in contact through an intermediate medium. Also, when the first feature is "above", "upper" and "upper side" of the second feature, it may only indicate that the first feature is directly above or obliquely above the second feature, or the horizontal height of the first feature is higher than that of the second feature. When the first feature is "below", "lower" and "lower side" of the second feature, it may only indicate that the first feature is directly below or obliquely below the second feature, or the horizontal height of the first feature is smaller than that of the second feature.

[0027] In addition, when one element is referred to as "fixed to" or "provided on" another element, it may be in direct contact with the other element, or an intermediate element may be present. When one element is considered to be "connected to" another element, it may be directly connected to the other element, or an intermediate element may be present at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this text are for illustrative purposes and do not represent the only embodiment.

[0028] Referring to FIG. 1, an embodiment of the present application provides a tricycle 100 including a vehicle body frame 10, two first wheels 20 and one second wheel 30. Both the first wheel 20 and the second wheel 30 are attached to the vehicle body frame 10. Specifically, the two first wheels 20 are provided coaxially. In the traveling direction of the tricycle 100, the second wheel 30 is located on the same side of the two first wheels 20.

[0029] In one specific embodiment, the two first wheels 20 are the front wheels of the tricycle 100, and the second wheel 30 is the rear wheel of the tricycle 100. That is, when the tricycle 100 travels, the second wheel 30 is located behind the first wheels 20. In other specific embodiments, the two first wheels 20 are the rear wheels of the tricycle 100, and the second wheel 30 is the front wheel of the tricycle 100. That is, when the tricycle 100 travels, the second wheel 30 is located in front of the first wheels 20.

[0030] The vehicle body frame 10 includes a first frame body 11 and a second frame body 12 connected to each other. The first wheel 20 is attached to the first frame body 11, and the second wheel 30 is attached to the second frame body 12.

[0031] Referring to FIG. 2, the first frame body 11 includes a first main beam 111 and a first fork 112. The first fork 112 is hingedly connected to the first main beam 111, and the first wheel 20 is connected to the first fork 112. The second frame body 12 includes a second main beam 121 and a second fork 122 connected to each other. The second main beam 121 is connected to the first main beam 111, and the second wheel 30 is connected to the second fork 122. Thus, since the first fork 112 is hingedly connected to the first main beam 111, when the tricycle 100 is running, the first fork 112 can rotate relative to the first main beam 111, whereby the first wheel 20 rotates relative to the second wheel 30 to realize the turning of the tricycle 100.

[0032] The tricycle 100 further includes a cab 40. For loading luggage and passengers, the cab 40 is attached to the first fork 112. When the tricycle is in the deployed state, the lowest part of the cab 40 is lower than the axial center position of the first wheel 20. Thus, the overall center of gravity of the tricycle 100 is lowered, and the stability of the tricycle 100 is improved.

[0033] In one embodiment, the first frame body 11 further includes a first vertical tube 113 connected to the first main beam 111. Referring to FIGS. 2 and 3, the tricycle 100 further includes a handle 50, and the handle 50 is attached to the first vertical tube 113. The second frame body 12 further includes a second vertical tube 123, and the tricycle 100 further includes a saddle 60, and the saddle 60 is attached to the second vertical tube 123. Thus, since the handle 50 is attached to the first frame body 11 and the saddle 60 is attached to the second frame body 12, the cyclist sits on the saddle 60, holds the handle 50 with his hand, and rides on the tricycle 100. Since the first wheel 20 is attached to the first frame body 11 and the second wheel 30 is attached to the second frame body 12, at this time, the second wheel 30 is used as the rear wheel of the tricycle 100.

[0034] The first frame body 11 further includes an inclined support pipe 114. The inclined support pipe 114 is obliquely supported between the first main beam 111 and the first vertical pipe 113 to improve the strength of the first frame body 11. Specifically, the inclined support pipe 114 is provided on the side of the first vertical pipe 113 close to the second frame body 12.

[0035] In one embodiment, the tricycle 100 further includes a folding mechanism 70. The folding mechanism 70 connects the first frame body 11 and the second frame body 12. Specifically, the folding mechanism 70 connects the first main beam 111 and the second main beam 121. The first frame body 11 and the second frame body 12 are folded or unfolded by the folding mechanism 70. In this way, when the tricycle 100 is in use, the first frame body 11 and the second frame body 12 are unfolded by the folding mechanism 70, and the tricycle 100 is in an unfolded state, enabling the normal use of the tricycle 100. When the tricycle 100 needs to be stored without being used, the first frame body 11 and the second frame body 12 are folded by the folding mechanism 70, and the tricycle 100 is in a folded state, facilitating the storage of the tricycle 100.

[0036] Referring to FIGS. 2 and 4, the folding mechanism 70 includes a first joint 71, a second joint 72, and a handle 73. The first joint 71 is connected to the first main beam 111, and the second joint 72 is connected to the second main beam 121. The first joint 71 is hingedly connected to the second joint 72, and the handle 73 is hingedly connected to the first joint 71 or the second joint 72. The folding mechanism 70 has a proximity state and a separation state. When the folding mechanism 70 is in the proximity state, the first joint 71 and the second joint 72 are close to each other, and the handle 73 locks the first joint 71 and the second joint 72. At this time, the first frame body 11 and the second frame body 12 are unfolded. When the folding mechanism 70 is in the separation state, the handle 73 unlocks the first joint 71 and the second joint 72, and the first joint 71 and the second joint 72 are separated. At this time, the first frame body 11 and the second frame body 12 are folded.

[0037] Furthermore, when the tricycle 100 is in the deployed state, in the extending direction of the first main beam 111, the second main beam 121 is provided at one end of the first main beam 111. Referring to FIGS. 5 and 6, when the tricycle 100 is in the folded state, the first main beam 111 and the second main beam 121 are provided at an acute angle, and the extending direction of the first main beam 111 is inclined with respect to the extending direction of the axis of the first wheel 20. In this way, the volume of the tricycle 100 is reduced, the space occupied by the tricycle 100 is decreased, and the storage of the tricycle 100 becomes convenient.

[0038] Furthermore, referring to FIG. 7, the cab 40 is removably connected to the first frame body 11, and when the tricycle 100 is in the folded state, the other parts of the tricycle 100 can be accommodated in the cab 40. In this way, the storage of the tricycle 100 becomes convenient.

[0039] In one specific embodiment, referring to FIGS. 8 and 9, when the tricycle 100 is in the folded state, the extending direction of the second main beam 121 is substantially parallel to the extending direction of the axis of the first wheel 20.

[0040] Referring to FIG. 2, the tricycle 100 further includes a caster assembly 80 mounted on the first frame body 11 or the second frame body 12. The caster assembly 80 can move relative to the vehicle body frame 10 and switch between a first position and a second position. When the caster assembly 80 is in the first position (see FIG. 2), the two first wheels 20 and the second wheel 30 together form a first support surface for supporting the tricycle 100. That is, when the tricycle 100 is placed on the ground, the caster assembly 80 does not push up the first wheels 20 and the second wheel 30. When the caster assembly 80 is in the second position (see FIGS. 10 and 11), the two first wheels 20 and the caster 81 of the caster assembly 80 together form a second support surface for supporting the tricycle 100. That is, when the tricycle 100 is placed on the ground, the caster assembly 80 can push up the second wheel 30.

[0041] According to the above arrangement, when the caster assembly 80 is in the first position, the two first wheels 20 and the second wheel 30 form a first support surface supported by the ground, and the caster assembly 80 does not contact the ground and does not interfere with the normal running of the tricycle 100. When the caster assembly 80 is in the second position, the two first wheels 20 and the caster 81 form a second support surface supported by the ground. At this time, the second wheel 30 is pushed up by the caster 81, which saves effort when folding or unfolding the tricycle 100. When the tricycle 100 is in the folded state, since the caster 81 can move in all directions at 360°, the tricycle 100 can also be moved via the caster 81, making it easier to move the tricycle 100 in the folded state.

[0042] Referring to FIGS. 12 and 13, the second frame body 12 further includes a connecting pipe 124 and a connecting portion 125. The connecting pipe 124 is connected to both the second main beam 121 and the second vertical pipe 123. The connecting portion 125 is connected to the connecting pipe 124, and the caster assembly 80 is hinge-connected to the connecting portion 125. By connecting the connecting pipe 124 to both the second main beam 121 and the second vertical pipe 123, the connection strength between the caster assembly 80 and the second frame body 12 can be improved.

[0043] As can be understood, in some other embodiments, the connecting pipe 124 may be connected to only the second main beam 121 or the second vertical pipe 123.

[0044] The tricycle 100 further includes a hinge shaft 90. The hinge shaft 90 is connected to the first frame body 11 or the second frame body 12. Specifically, the hinge shaft 90 is connected to the connecting portion 125 of the second frame body 12. More specifically, the hinge shaft 90 is bored through the connecting portion 125. The caster assembly 80 is hinge-connected to the first frame body 11 or the second frame body 12 via the hinge shaft 90. Specifically, the caster assembly 80 further includes a connecting shaft 82. The caster 81 is connected to one end of the connecting shaft 82, and the hinge shaft 90 is bored through the other end of the connecting shaft 82.

[0045] The caster assembly 80 further includes a shaft sleeve 83 and an elastic member 84. A position regulating protrusion 821 protrudes from the outer surface of the connecting shaft 82. Both the elastic member 84 and the shaft sleeve 83 are externally fitted outside the connecting shaft 82. The elastic member 84 is provided in a compressed state between the shaft sleeve 83 and the position regulating protrusion 821. When the caster assembly 80 is in the first position and the second position, the shaft sleeve 83 abuts against the connecting portion 125 and is position-regulated.

[0046] According to the above installation, when the caster 81 is in the first position and the second position, due to the action of the elastic member 84, the shaft sleeve 83 abuts against the connecting portion 125. In this way, it restricts the caster assembly 80 from switching from the first position to the second position due to the action of gravity, and also restricts the caster assembly 80 from switching from the second position to the first position during the process of folding or unfolding the tricycle 100.

[0047] In one embodiment, the elastic member 84 is a spring. Of course, in some other embodiments, the type of the elastic member 84 is not limited.

[0048] Furthermore, the connecting portion 125 is provided with a first position restricting surface 1251 and a second position restricting surface 1252. When the caster assembly 80 is in the first position, the end surface of the shaft sleeve 83 away from the elastic member 84 abuts against the first position restricting surface 1251, restricting the caster assembly 80 from switching from the first position to the second position. When the caster assembly 80 is in the second position, the end surface of the shaft sleeve 83 away from the elastic member 84 abuts against the second position restricting surface 1252, restricting the caster assembly 80 from switching from the second position to the first position. In this way, the position restricting effect is strengthened by the abutment of surfaces.

[0049] In one embodiment, the handle 50 is rotatably provided on the first vertical tube 113. In this way, when folding the tricycle 100, the handle 50 can be rotated to an appropriate position, and furthermore, the space occupied during the folding of the tricycle 100 can be reduced.

[0050] Furthermore, referring to FIG. 2, the tricycle 100 further includes a quick release 110, which is connected to the first vertical tube 113 and can be switched between a first state and a second state with respect to the first vertical tube 113. When the quick release 110 is in the first state, the quick release 110 allows the handle 50 to move with respect to the first vertical tube 113, while when the quick release 110 is in the second state, the quick release 110 restricts the handle 50 from moving with respect to the first vertical tube 113. By installing the quick release 110, the handle 50 can be locked during driving, enabling safe driving. When the tricycle 100 needs to be switched between a folded state and a deployed state, the quick release 110 is in the first state so that the handle 50 can move with respect to the first vertical tube 113.

[0051] The handle 50 includes a sleeve tube 51 and a handle body 52 connected to each other, and the sleeve tube 51 is fitted with the first vertical tube 113. When the quick release 110 is in the first state, the quick release 110 allows the sleeve tube 51 to move with respect to the first vertical tube 113, while when the quick release 110 is in the second state, the quick release 110 restricts the sleeve tube 51 from moving with respect to the first vertical tube 113. Specifically, when the quick release 110 is in the first state, the quick release 110 allows the sleeve tube 51 to rotate and move axially with respect to the first vertical tube 113, while when the sleeve tube 51 is in the second state, the quick release 110 restricts the sleeve tube 51 from rotating and moving axially with respect to the first vertical tube 113.

[0052] In one embodiment, the tricycle 100 further includes a motor system 120, which is installed in an installation space formed by the second vertical tube 123 and the second main beam 121. In this way, it is possible to realize the integration of manual driving and motor - assisted power.

[0053] The operating principle of the tricycle 100 according to the embodiments of the present application is as follows.

[0054] When switching from the unfolded state to the folded state: Operate the caster assembly 80 to switch it from the first position to the second position. The caster assembly 80 pushes up the second wheel 30, and the first wheel 20 and the caster 81 form the second support surface. Operate the handle 73 to unlock the first joint 71 and the second joint 72. With the assistance of the caster 81, the folding of the first frame body 11 and the second frame body 12 is completed. Operate the cab 40 to drive the second fork 122 to rotate with respect to the first main beam 111, and make the second main beam 121 substantially parallel to the axis of the first wheel 20. Operate the quick release 110 to enable the handle 50 to rotate and move axially with respect to the first vertical tube 113, rotate the handle 50 to an appropriate angle, and retract the sleeve tube 51 into the first vertical tube 113.

[0055] When switching from the folded state to the unfolded state: Operate the quick release 110 to enable the handle 50 to rotate and move axially with respect to the first vertical tube 113. The handle 50 returns, and the sleeve tube 51 extends out from the first vertical tube 113. Operate the cab 40 to drive the second fork 122 to rotate and return with respect to the first main beam 111. The caster assembly 80 is still in the second position. The caster assembly 80 pushes up the second wheel 30. With the assistance of the caster 81, the first frame body 11 and the second frame body 12 unfold. Operate the handle 73 to lock the first joint 71 and the second joint 72.

[0056] Each technical feature of the above embodiments can be arbitrarily combined. For the sake of brevity of description, not all possible combinations of each technical feature in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be understood that it is within the scope described in this specification.

[0057] The above embodiments merely illustrate some embodiments of the present application. Although the description is specifically detailed, it should not be construed as limiting the scope of the claims. For those skilled in the art, several modifications and improvements are possible without departing from the concept of the present application, and all of these belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application should be based on the scope of the claims.

Description of Reference Numerals

[0058] 100 Three-wheeled bicycle, 10 Vehicle body frame, 11 First frame body, 111 First main beam, 112 First fork, 113 First vertical tube, 114 Inclined support tube, 12 Second frame body, 121 Second main beam, 122 Second fork, 123 Second vertical tube, 124 Connecting tube, 125 Connection part, 1251 First position regulating surface, 1252 Second position regulating surface, 20 First wheel, 30 Second wheel, 40 Passenger compartment, 50, Handle, 51 Sleeve tube, 52 Handle body, 60 Saddle, 70 Folding mechanism, 71 First joint, 72 Second joint, 73 Handlebar, 80 Caster assembly, 81 Caster, 82 Connecting shaft, 821 Position regulating protrusion, 83 Shaft sleeve, 84 Elastic member, 90 Hinge shaft, 110 Quick release, 120 Motor system.

Claims

1. A tricycle, comprising a vehicle body frame (10), a folding mechanism (70), a first wheel (20), a second wheel (30), and a caster assembly (80), wherein the vehicle body frame (10) includes a first frame body (11) and a second frame body (12) connected to each other, the folding mechanism (70) connects the first frame body (11) and the second frame body (12), and the first frame body (11) and the second frame body (12) are folded or unfolded by the folding mechanism (70), two of the first wheels (20) are mounted on the first frame body (11), one of the second wheels (30) is mounted on the second frame body (12), the caster assembly (80) is mounted on the vehicle body frame (10) and is movable relative to the vehicle body frame (10) to switch between a first position and a second position. The caster assembly (80) includes a caster (81). When the caster assembly (80) is in the first position, the two first wheels (20) and the second wheel (30) form a first support surface for supporting the tricycle. When the caster assembly (80) is in the second position, the two first wheels (20) and the caster (81) form a second support surface for supporting the tricycle. A tricycle characterized by the above.

2. The first frame body (11) includes a first main beam (111) and a first fork (112). The first fork (112) is hingedly connected to the first main beam (111). The first wheel (20) is connected to the first fork (112). The tricycle further includes a cab (40). The cab (40) is attached to the first fork (112). The second frame body (12) includes a second main beam (121) and a second fork (122) connected to each other. The second wheel (30) is connected to the second fork (122). The folding mechanism (70) connects the first main beam (111) and the second main beam (121). The tricycle according to claim 1, characterized by the above.

3. The first frame body (11) further includes a first vertical pipe (113) connected to the first main beam (111). The tricycle includes a handle (50), and the handle (50) is rotatably provided on the first vertical tube (113). The tricycle according to claim 2, characterized in that.

4. The tricycle further includes a quick release (110). The quick release (110) is connected to the first vertical tube (113) and can be switched between a first state and a second state with respect to the first vertical tube (113). When the quick release (110) is in the first state, the quick release (110) allows the handle (50) to move with respect to the first vertical tube (113). When the quick release (110) is in the second state, the quick release (110) restricts the movement of the handle (50) with respect to the first vertical tube (113). The tricycle according to claim 3, characterized in that.

5. The second frame body (12) further includes a second vertical tube (123), a connecting tube (124), and a connecting portion (125). The second vertical tube (123) is connected to both the second main beam (121) and the second fork (122). The connecting tube (124) is connected to both the second main beam (121) and the second vertical tube (123). The connecting portion (125) is connected to the connecting tube (124). The caster assembly (80) is hingedly connected to the connecting portion (125). The tricycle further includes a saddle (60), and the saddle (60) is attached to the second vertical tube (123). The tricycle according to claim 2, characterized in that.

6. When the tricycle is in the folded state, the first main beam (111) and the second main beam (121) are provided to form an acute angle, and the extending direction of the first main beam (111) is inclined with respect to the extending direction of the axis of the first wheel (20). The tricycle according to claim 2, characterized in that.

7. The tricycle further includes a cab (40), and the cab (40) is attached to the first frame body (11). When the tricycle is in the deployed state, the lowest part of the cab (40) is lower than the axial center position of the first wheel (20). The tricycle according to claim 1, characterized in that.

8. The three-wheeled bicycle further includes a cab (40), and the cab (40) is attached to the first frame body (11). The cab (40) is removably connected to the first frame body (11). When the three-wheeled bicycle is in a folded state, the remaining part of the three-wheeled bicycle can be accommodated in the cab (40). The three-wheeled bicycle according to claim 1, characterized in that.

9. The three-wheeled bicycle further includes a hinge shaft (90). The hinge shaft (90) is connected to the first frame body (11) or the second frame body (12). The caster assembly (80) is hingedly connected to the first frame body (11) or the second frame body (12) via the hinge shaft (90). The caster assembly (80) further includes a connecting shaft (82), a shaft sleeve (83), and an elastic member (84). One end of the connecting shaft (82) is hingedly connected to the hinge shaft (90), and the holder of the caster (81) is rotatably provided at the other end of the connecting shaft (82). A position regulating protrusion (821) is convexly provided on the outer surface of the connecting shaft (82). Both the elastic member (84) and the shaft sleeve (83) are externally fitted outside the connecting shaft (82). The elastic member (84) is provided in a compressed state between the shaft sleeve (83) and the position regulating protrusion (821). When the caster assembly (80) is in the first position and the second position, the shaft sleeve (83) abuts against the second frame body (12) and is position-regulated. The three-wheeled bicycle according to any one of claims 1 to 7, characterized in that.

10. A first position regulating surface (1251) and a second position regulating surface (1252) are provided on the second frame body (12). When the caster assembly (80) is in the first position, the end surface of the shaft sleeve (83) away from the elastic member (84) abuts against the first position regulating surface (1251), restricting the caster assembly (80) from switching from the first position to the second position. When the caster assembly (80) is in the second position, the end surface of the shaft sleeve (83) away from the elastic member (84) abuts against the second position regulating surface (1252), restricting the caster assembly (80) from switching from the second position to the first position. The three-wheeled bicycle according to claim 9, characterized in that.

11. The first frame body (11) includes a first main beam (111) and a first fork (112). The first fork (112) is hingedly connected to the first main beam (111), and the first wheel (20) is connected to the first fork (112). The second frame body (12) includes a second main beam (121) and a second fork (122) connected to each other. The second wheel (30) is connected to the second fork (122). The folding mechanism (70) connects the first main beam (111) and the second main beam (121). The tricycle according to claim 1, characterized in that.

12. The folding mechanism (70) includes a first joint (71), a second joint (72), and a handle (73). The first joint (71) is hingedly connected to the second joint (72), and the handle (73) is hingedly connected to the first joint (71) or the second joint (72). The first joint (71) is connected to the first main beam (111), and the second joint (72) is connected to the second main beam (121). The tricycle according to claim 11, characterized in that.

13. When the tricycle (100) is in a folded state, the extending direction of the second main beam (121) is substantially parallel to the extending direction of the axis of the first wheel (20). The tricycle according to claim 11, characterized in that.

14. The first frame body (11) further includes a first vertical tube (113) and an inclined support tube (114). The first vertical tube (113) is connected to the first main beam (111), and the inclined support tube (114) is obliquely supported between the first main beam (111) and the first vertical tube (113). The tricycle according to claim 11, characterized in that.

15. The second frame body (12) further includes a second vertical tube (123), and the second vertical tube (123) is connected to the second main beam (121). The tricycle (100) further includes a motor system (120), and the motor system (120) is installed in an installation space formed by the second vertical tube (123) and the second main beam (121). The tricycle according to claim 11, characterized in that.

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