CN219428291U - Tricycle - Google Patents

Abstract

The application relates to a tricycle, include: the frame comprises a front frame body and a rear frame body, wherein the rear frame body comprises a main body and a first vertical pipe which are connected with each other, and the main body is hinged with the front frame body; two front wheels assembled on the front frame body and one rear wheel assembled on the main body; the handle assembly part is rotationally assembled in the first vertical pipe; the connecting rod mechanism and the power assisting mechanism are connected with each other, and the power assisting mechanism is connected with the handle assembly and the front frame body; when the handle assembly is operated to rotate relative to the first vertical pipe, the handle assembly applies acting force to the power assisting mechanism, and the power assisting mechanism assists the front frame body to rotate relative to the rear frame body through the connecting rod mechanism. When the handle assembly is operated to rotate relative to the first vertical pipe, the handle assembly applies acting force to the power assisting mechanism, after the power assisting mechanism receives the acting force, the front frame body is assisted to rotate relative to the rear frame body through the connecting rod mechanism, and the steering of the tricycle can be operated when smaller force is adopted relative to the prior art, so that the steering of the tricycle is facilitated.

Description

Tricycle

Technical Field

The application relates to the technical field of bicycles, in particular to a tricycle.

Background

The bicycle can be used as an environment-friendly transportation means for riding instead of walk and going out. The bicycle comprises a two-wheeled bicycle and a three-wheeled bicycle, wherein the three-wheeled bicycle comprises a carriage, and the carriage can be used for loading goods and carrying people, so that the three-wheeled bicycle is widely applied to daily life of people.

The carriage of the tricycle is loaded on a front frame body for installing the front wheels, and the weight of the carriage acts on the front frame body, so that the front wheels are difficult to steer. When the cargoes or persons are loaded in the carriage, the weight applied to the front frame body by the carriage is larger, and the front wheels are more difficult to turn.

Disclosure of Invention

Based on this, it is necessary to provide a tricycle convenient to steer against the problem of difficult steering of the conventional tricycle.

A tricycle, comprising:

the frame comprises a front frame body and a rear frame body, wherein the rear frame body comprises a main body and a first vertical pipe which are connected with each other, and the main body is hinged with the front frame body;

two front wheels mounted on the front frame and one rear wheel mounted on the main body;

the handle assembly is partially rotatably assembled in the first vertical pipe;

the connecting rod mechanism and the power assisting mechanism are connected with each other, and the power assisting mechanism and the connecting rod mechanism are connected with the handle assembly and the front frame body;

when the handle assembly is operated to rotate relative to the first vertical pipe, the handle assembly applies acting force to the power assisting mechanism, and the power assisting mechanism assists the front frame body to rotate relative to the rear frame body through the connecting rod mechanism.

Above-mentioned tricycle, when operating handle subassembly rotates for first standpipe, handle subassembly will exert effort in power assisting mechanism, and power assisting mechanism receives behind the effort, and frame body rotates behind relative the frame body of helping hand through link mechanism, for prior art (tricycle among the prior art does not set up power assisting mechanism), can operate tricycle when adopting less power and turn to, makes things convenient for tricycle's turning to.

In one embodiment, the assist mechanism and the link mechanism are located on the same side of the main body in an axial direction of the rear wheel.

In one embodiment, the power assisting mechanism is fixedly mounted on the main body or the front frame body;

the connecting rod mechanism comprises a first connecting rod assembly and a second connecting rod assembly, one end of the first connecting rod assembly is hinged with the handle assembly, the other end of the first connecting rod assembly is fixedly connected with the power assisting mechanism, one end of the second connecting rod assembly is fixedly connected with the power assisting mechanism, and the other end of the second connecting rod assembly is hinged with the front frame body;

wherein, when the handle assembly is operated to rotate relative to the first standpipe, the handle assembly applies a force to the booster mechanism via the first linkage assembly.

In one embodiment, the handle assembly comprises a handle and a connecting pipe which are connected with each other, and the connecting pipe is sleeved in the first vertical pipe;

the tricycle further comprises a connecting piece connected with the connecting pipe, and the connecting piece extends towards a direction away from the main body relative to the connecting pipe; the first connecting rod assembly is connected with the connecting sheet.

In one embodiment, the first link assembly comprises two links hinged to each other; and/or

The second connecting rod assembly comprises two connecting rods hinged with each other.

In one embodiment, the power assisting mechanism comprises a mounting seat mounted on the main body or the front frame body, an input shaft, a torsion sensor, a controller, a first driving piece and an output shaft, wherein the input shaft, the torsion sensor, the controller, the first driving piece and the output shaft are mounted on the mounting seat, the input shaft is connected with the handle assembly, the output shaft is connected with the input shaft and the front frame body, and the torsion sensor is used for detecting whether the input shaft rotates;

when the torsion sensor detects that the input shaft rotates, a signal is transmitted to the controller, the controller controls the first driving piece to drive the output shaft to rotate, and the output shaft drives the input shaft to rotate, so that the front frame body is assisted to rotate relative to the rear frame body through the connecting rod mechanism.

In one embodiment, the main body comprises a main beam and a fork, the main beam comprising a first beam and a second beam; the first vertical pipe is connected with one end of the first beam, the front frame body is hinged with the other end of the first beam, one end of the second beam is sleeved in the first beam, the fork is connected with the other end of the second beam, and the rear wheel is assembled at one end, far away from the second beam, of the fork;

the second beam is capable of being partially retracted into or extended from within the first beam.

In one embodiment, the first standpipe is connected to one of the sides of the first beam in an axial direction of the rear wheel.

In one embodiment, the tricycle has a first center line, two front wheels are symmetrically arranged on two sides of the first center line, the front frame body, the fork and the rear wheels are symmetrical about the first center line, and the first center line passes through a hinge point of the first beam and the front frame body;

the main beam is provided with a second central line extending along the longitudinal direction of the main beam, the first vertical pipe is provided with a third central line extending along the longitudinal direction of the main beam, and the second central line and the third central line are respectively distributed on two sides of the first central line.

In one embodiment, the tricycle further comprises a second driving piece, a screw rod and a nut, wherein the second driving piece is installed in the main beam, the second driving piece is installed on one of the first beam and the second beam, the screw rod is connected with the second driving piece, and the nut is installed on the other one of the first beam and the second beam and is in threaded connection with the screw rod;

the extending direction of the screw rod is parallel to the extending direction of the main beam.

Drawings

FIG. 1 is an isometric view of a tricycle (with the second beam extending from the first beam in FIG. 1) from a perspective according to one embodiment of the present application;

FIG. 2 is an isometric view of the tricycle shown in FIG. 1 from another perspective;

FIG. 3 is an isometric view of the tricycle shown in FIG. 1 from yet another perspective;

FIG. 4 is an isometric view of the tricycle shown in FIG. 1 from a further perspective;

FIG. 5 is an isometric view of a partial structure of the tricycle shown in FIG. 1 (the carriage is omitted from FIG. 5);

FIG. 6 is an isometric view of another view of the structure shown in FIG. 5;

FIG. 7 is an enlarged view at A of the structure shown in FIG. 6;

fig. 8 is a cross-sectional view of a tricycle (the second beam of fig. 8 extending from within the first beam) provided in accordance with another embodiment of the present application.

100. A tricycle; 10. a frame; 11. a front frame body; 12. a rear frame body; 121. a main body; 1211. a main beam; 1212. a fork; 1213. a first beam; 1214. a second beam; 1215. a second standpipe; 1216. a mounting; 122. a first standpipe; 20. a front wheel; 30. a rear wheel; 40. a carriage; 50. a handle assembly; 51. a handle; 52. a connecting pipe; 60. a link mechanism; 61. a first link assembly; 62. a second link assembly; 70. a power assisting mechanism; 71. a mounting base; 72. an input shaft; 73. a torsion sensor; 74. a first driving member; 75. an output shaft; 80. a connecting sheet; 90. a saddle; 110. a cushion; l1, a first center line; l2, a second centerline; 120. a second driving member; 130. a screw rod; 140. and (3) a nut.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 and 2, one embodiment of the present utility model provides a tricycle 100 that includes a frame 10, two front wheels 20, and a rear wheel 30. Front wheel 20 and rear wheel 30 are both mounted to frame 10. Specifically, the two front wheels 20 are coaxially disposed. In the traveling direction of the tricycle 100, the two front wheels 20 are located on the same side of the rear wheel 30. When the tricycle 100 is walking, the front wheel 20 is positioned in front of the rear wheel 30.

The frame 10 includes a front frame 11 and a rear frame 12, the rear frame 12 includes a main body 121 and a first vertical pipe 122 connected to each other, and the main body 121 is hinged to the front frame 11. Both front wheels 20 are mounted on the front frame 11, and the rear wheel 30 is mounted at one end of the main body 121 remote from the front frame 11. The tricycle 100 further includes a carriage 40, and the carriage 40 is mounted on the front frame body 11 so as to load goods or carry persons. Specifically, the lowest point of the wagon box 40 is lower than the axial center position of the front wheel 20, so that the center of gravity of the entire tricycle 100 is lower to ensure the running stability of the tricycle 100.

The tricycle 100 also includes a handle assembly 50, a linkage 60, and a booster mechanism 70. The link mechanism 60 and the power assist mechanism 70 are connected to each other, and at the same time, the link mechanism 60 and the power assist mechanism 70 are connected to the handle assembly 50 and the front frame 11 together.

It should be noted that, the following cases where the link mechanism 60 and the power assisting mechanism 70 jointly connect the handle assembly 50 and the front frame 11 include:

1. the power assisting mechanism 70 is directly connected with the front frame 11 and is connected with the handle assembly 50 through the connecting rod mechanism 60;

2. the power assisting mechanism 70 is directly connected with the handle assembly 50 and is connected with the front frame 11 through the connecting rod mechanism 60;

3. the assist mechanism 70 is indirectly connected to the handle assembly 50 and the front frame 11 via the link mechanism 60.

Further, when the handle assembly 50 is operated to rotate relative to the first standpipe 122, the handle assembly 50 applies a force to the assist mechanism 70, and the assist mechanism 70 assists the front frame body 11 to rotate relative to the rear frame body 12 via the link mechanism 60.

When the handle assembly 50 is rotated relative to the first vertical tube 122, the handle assembly 50 applies a force to the booster mechanism 70, and after the booster mechanism 70 receives the force, the front frame 11 is boosted by the link mechanism 60 to rotate relative to the rear frame 12, and the tricycle 100 can be steered with a smaller force compared with the prior art (the tricycle 100 in the prior art is not provided with the booster mechanism 70), so that the tricycle 100 can be steered conveniently.

In one embodiment, referring to fig. 3, the assist mechanism 70 is located on the same side of the body 121 as the link mechanism 60 in the axial direction of the rear wheel 30, to facilitate the installation of the assist mechanism 70 and the link mechanism 60.

Further, the power assisting mechanism 70 is fixedly mounted on the main body 121 or the front frame 11, and the link mechanism 60 includes a first link assembly 61 and a second link assembly 62 (see fig. 2 and 4). One end of the first link assembly 61 is hinged to the handle assembly 50, and the other end is fixedly connected to the power assist mechanism 70. One end of the second link assembly 62 is fixedly connected with the booster mechanism 70, and the other end is hinged with the front frame 11. Wherein, when the handle assembly 50 is rotated relative to the first standpipe 122, the handle assembly 50 applies a force to the booster mechanism 70 via the first linkage assembly 61.

In the above arrangement, when the handle assembly 50 is rotated relative to the first standpipe 122, the handle assembly 50 drives the first link assembly 61 to move, the first link assembly 61 applies a force to the assist mechanism 70, and after the assist mechanism 70 receives the force, the front frame 11 is assisted to rotate relative to the main body 121 by the first link assembly 61 and the second link assembly 62, so as to facilitate steering.

In one embodiment, the first and second link assemblies 61 and 62 each comprise two links that are hingedly connected to each other. It should be appreciated that in other embodiments, the number of links included in the first and second link assemblies 61 and 62 is not limited and may include one link or more than two links that are articulated to one another.

Referring to fig. 5 to 7, the assist mechanism 70 includes a mount 71, an input shaft 72, a torque sensor 73, a controller, a first driving member 74, and an output shaft 75. The mount 71 is attached to the main body 121 or the front frame 11, and the input shaft 72, the torque sensor 73, the controller, the first driver 74, and the output shaft 75 are attached to the mount 71. The input shaft 72 is connected to the first link assembly 61, and the output shaft 75 is connected to the input shaft 72 and to the front frame 11 through the second link assembly 62. The torque sensor 73 is configured to detect whether the input shaft 72 rotates, and when the torque sensor 73 detects that the output shaft 75 rotates, a signal is transmitted to the controller, and the controller controls the first driving member 74 to drive the output shaft 75 to rotate, and the output shaft 75 drives the input shaft 72 to rotate, and drives the front frame 11 to rotate relative to the rear frame 12 through the first link assembly 61 and the second link assembly 62, so as to assist the tricycle 100 to steer. Specifically, the first driver 74 is a motor.

Specifically, when the input shaft 72 rotates 0.1 ° -0.5 °, the torsion sensor 73 detects the rotation of the input shaft 72 and transmits a signal to the controller.

In one embodiment, with continued reference to FIG. 2, the handle assembly 50 includes a handle 51 and a connecting tube 52 connected to each other, the connecting tube 52 is sleeved in the first standpipe 122, and the first connecting rod assembly 61 is connected to an end of the connecting tube 52 extending out of the first standpipe 122. Specifically, the tricycle 100 further includes a connection piece 80 (see fig. 1 and 7) connected to the connection pipe 52, the connection piece 80 extending away from the main body 121 with respect to the connection pipe 52, and the first link assembly 61 is connected to the connection pipe 52 through the connection piece 80. Thus, since the connection piece 80 has a certain extension length, interference with other parts during mutual rotation caused by direct connection of the first link assembly 61 and the connection pipe 52 is avoided, and interference with steering of the tricycle 100 is reduced.

In one embodiment, with continued reference to fig. 2 and 3, the main body 121 includes a main beam 1211 and a fork 1212, the main beam 1211 including a first beam 1213 and a second beam 1214. The first standpipe 122 is connected to one end of the first beam 1213, the front frame 11 is hinged to the other end of the first beam 1213, one end of the second beam 1214 is sleeved in the first beam 1213, the fork 1212 is connected to the other end of the second beam 1214, and the rear wheel 30 is mounted to one end of the fork 1212 remote from the second beam 1214. The second beam 1214 can at least partially retract into the first beam 1213 or extend from within the first beam 1213.

In the above arrangement, since the second beam 1214 of the main beam 1211 can be at least partially retracted into the first beam 1213, the occupied space can be reduced when the tricycle 100 is stored, which is convenient for home storage.

Further, in the axial direction of the rear wheel 30, the first standpipe 122 is connected to one side of the first beam 1213. Generally, the main beam 1211 has a rectangular parallelepiped cross-sectional shape, and the width of the side portions is greater than the widths of the top and bottom portions. When the first standpipe 122 is connected to the side of the first beam 1213, the connection area of the first standpipe 122 to the first beam 1213 is increased, and the connection strength is ensured. Meanwhile, when the first standpipe 122 is connected to the side of the first beam 1213, the connection tube 52 is facilitated to pass out of the first standpipe 122 for connection with other components.

In one embodiment, with continued reference to fig. 4, the tricycle 100 has a first centerline L1, the two front wheels 20 are symmetrically disposed on both sides of the first centerline L1, the front frame 11, the fork 1212, and the rear wheel 30 are symmetrical about the first centerline L1, and the first centerline L1 passes through the hinge point of the first beam 1213 and the front frame 11. The main beam 1211 has a second central line L2 extending along the longitudinal direction thereof, the first standpipe 122 has a third central line extending along the longitudinal direction thereof, and the second central line L2 and the third central line are respectively distributed on two sides of the first central line L1. In this manner, the connection of the first standpipe 122 to the side of the first beam 1213 can be facilitated to increase the strength of the connection. Meanwhile, as the second central line L2 and the third central line are respectively positioned at two sides of the first central line L1, compared with the situation that the second central line L2 coincides with the first central line L1 and only the third central line deviates from the first central line L1, the distance of the third central line deviating from the first central line L1 is reduced, namely the distance of the center of the first vertical pipe 122 deviating from the first central line L1 of the tricycle 100 is reduced, the handles 51 at two sides are symmetrical, and riding experience is improved.

In one embodiment, with continued reference to fig. 3 and 5, the body 121 further includes a second standpipe 1215, the second standpipe 1215 is connected to both the second beam 1214 and the fork 1212, and the second standpipe 1215 is located on a side of the first standpipe 122 remote from the carriage 40. The tricycle 100 also includes a saddle 90, the saddle 90 being disposed on a second standpipe 1215.

Referring to fig. 8, the tricycle 100 further includes a second driving member 120 installed in the main beam 1211, the second driving member 120 being installed on one of the first beam 1213 and the second beam 1214, the screw 130 being connected to the second driving member 120, and a screw nut 140 being installed on the other of the first beam 1213 and the second beam 1214 and being screw-coupled to the screw 130. The extending direction of the screw 130 is parallel to the extending direction of the main beam 1211.

In the above arrangement, the second driving member 120 can drive the screw 130 to rotate so as to drive the nut 140 to move, thereby enabling the second beam 1214 to automatically retract into the first beam 1213 or extend from the first beam 1213.

In one embodiment, the second driver 120 is mounted on the first beam 1213 and the nut 140 is coupled to the second beam 1214. In another embodiment, the second driver 120 may be mounted to the second beam 1214 with the nut 140 coupled to the first beam 1213.

Specifically, the second driving member 120 is a motor. Of course, in other embodiments, the type of the second driving member 120 is not limited, as long as the driving screw 130 can be driven to rotate.

Further, with continued reference to fig. 1 and 3, the body 121 further includes a seat carrier 1216, the seat carrier 1216 being connected to the fork 1212 and positioned rearward of the second standpipe 1215. The tricycle 100 also includes a seat cushion 110, the seat cushion 110 being disposed on the seat carrier 1216 to improve riding comfort for a rider.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. A tricycle, comprising:

the vehicle frame (10) comprises a front frame body (11) and a rear frame body (12), wherein the rear frame body (12) comprises a main body (121) and a first vertical pipe (122) which are connected with each other, and the main body (121) is hinged with the front frame body (11);

two front wheels (20) mounted on the front frame body (11) and one rear wheel (30) mounted on the main body (121);

a handle assembly (50) partially rotatably mounted within the first standpipe (122);

a link mechanism (60) and a power assisting mechanism (70) which are connected with each other, wherein the power assisting mechanism (70) and the link mechanism (60) connect the handle assembly (50) and the front frame body (11);

wherein, when the handle assembly (50) is operated to rotate relative to the first vertical pipe (122), the handle assembly (50) applies a force to the power assisting mechanism (70), and the power assisting mechanism (70) assists the front frame body (11) to rotate relative to the rear frame body (12) through the connecting rod mechanism (60).

2. Tricycle according to claim 1, characterised in that the booster mechanism (70) and the link mechanism (60) are located on the same side of the body (121) in the axial direction of the rear wheel (30).

3. Tricycle according to claim 1 or 2, characterised in that the booster mechanism (70) is fixedly mounted on the main body (121) or the front frame body (11);

the connecting rod mechanism (60) comprises a first connecting rod assembly (61) and a second connecting rod assembly (62), one end of the first connecting rod assembly (61) is hinged with the handle assembly (50), the other end of the first connecting rod assembly is fixedly connected with the power assisting mechanism (70), one end of the second connecting rod assembly (62) is fixedly connected with the power assisting mechanism (70), and the other end of the second connecting rod assembly is hinged with the front frame body (11);

wherein, when the handle assembly (50) is operated to rotate relative to the first standpipe (122), the handle assembly (50) applies a force to the booster mechanism (70) via the first linkage assembly (61).

4. A tricycle according to claim 3, characterised in that the handle assembly (50) comprises a handle (51) and a connecting tube (52) connected to each other, the connecting tube (52) being nested within the first standpipe (122);

the tricycle further comprises a connecting piece (80) connected with the connecting pipe (52), and the connecting piece (80) extends towards a direction away from the main body (121) relative to the connecting pipe (52); the first link assembly (61) is connected with the connecting piece (80).

5. A tricycle according to claim 3, characterised in that the first link assembly (61) comprises two links hinged to each other; and/or

The second link assembly (62) includes two links that are hinged to each other.

6. The tricycle according to claim 1, characterised in that the power-assisted mechanism (70) comprises a mounting (71) mounted on the main body (121) or the front frame (11), and an input shaft (72), a torsion sensor (73), a controller, a first driving member (74) and an output shaft (75) mounted on the mounting (71), the input shaft (72) being connected to the handle assembly (50), the output shaft (75) being connected to the input shaft (72) and the front frame (11), the torsion sensor (73) being arranged to detect whether the input shaft (72) is rotated;

when the torsion sensor (73) detects that the input shaft (72) rotates, a signal is transmitted to the controller, the controller controls the first driving piece (74) to drive the output shaft (75) to rotate, the output shaft (75) drives the input shaft (72) to rotate, and then the front frame body (11) is assisted to rotate relative to the rear frame body (12) through the connecting rod mechanism (60).

7. The tricycle of claim 1, wherein the main body (121) comprises a main beam (1211) and a fork (1212), the main beam (1211) comprising a first beam (1213) and a second beam (1214); the first vertical pipe (122) is connected with one end of the first beam (1213), the front frame body (11) is hinged with the other end of the first beam (1213), one end of the second beam (1214) is sleeved in the first beam (1213), the fork (1212) is connected with the other end of the second beam (1214), and the rear wheel (30) is assembled at one end of the fork (1212) far away from the second beam (1214);

the second beam (1214) is partially collapsible into the first beam (1213) or extendable from within the first beam (1213).

8. The tricycle according to claim 7, characterised in that the first standpipe (122) is connected to one of the sides of the first beam (1213) in the axial direction of the rear wheel (30).

9. The tricycle according to claim 8, characterised in that it has a first centre line (L1), two of said front wheels (20) being symmetrically arranged on both sides of said first centre line (L1), said front frame (11), said fork (1212) and said rear wheel (30) being symmetrical with respect to said first centre line (L1), said first centre line (L1) passing through the hinge point of said first beam (1213) with said front frame (11);

the main beam (1211) has a second center line (L2) extending in a longitudinal direction thereof, the first standpipe (122) has a third center line extending in the longitudinal direction thereof, and the second center line (L2) and the third center line are respectively distributed on both sides of the first center line (L1).

10. The tricycle of claim 7, further comprising a second drive member (120) mounted within the main beam (1211), a screw (130) and a nut (140), the second drive member (120) being mounted on one of the first beam (1213) and the second beam (1214), the screw (130) being connected to the second drive member (120), the nut (140) being mounted on the other of the first beam (1213) and the second beam (1214) and being threaded with the screw (130);

the extending direction of the screw rod (130) is parallel to the extending direction of the main beam (1211).