CN111017088A

CN111017088A - Automatic steering bicycle

Info

Publication number: CN111017088A
Application number: CN201911393555.6A
Authority: CN
Inventors: 夏正磊; 王琴; 龙美秀; 李鑫
Original assignee: 618 Technology (shenzhen) Co Ltd
Current assignee: 618 Technology (shenzhen) Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-04-17

Abstract

The invention relates to the technical field of bicycles, and provides an automatic steering bicycle, which comprises: the main shaft rotates and is arranged at the center of the first rotating wheel, the main frame body is fixed at two ends of the main shaft, the second rotating wheels are provided with two, the two second rotating wheels rotate and are arranged at two ends of the connecting shaft respectively, the connecting shaft is connected with the main frame body in a rotating mode, and an engaging mechanism used for limiting the main frame body in a matched mode or driving the direction of the second rotating wheels to change is arranged between the connecting shaft and the main frame body. The first rotating wheel and the two second rotating wheels form the tricycle, so that the tricycle is balanced without overturning, the balance of the bicycle is controlled without hands, the direction of the bicycle is changed by changing the advancing direction of the first rotating wheel, the advancing direction of the first rotating wheel can be realized by the bias of the body of a person, and the tricycle can be ridden by hands with looseness.

Description

Automatic steering bicycle

Technical Field

The invention relates to the technical field of bicycles, in particular to an automatic steering bicycle.

Background

Bicycles are a traditional industry with a history of over 100 years, and due to environmental protection and traffic problems, bicycles are becoming popular transportation means for transportation. The current bicycles generally include two-wheeled bicycles, three-wheeled bicycles and four-wheeled bicycles. The existing bicycle generally comprises a frame, a front wheel support, a front wheel, a rear wheel and a chain and chain wheel driving mechanism, wherein the front wheel is rotatably arranged on the front wheel support, the rear wheel is rotatably arranged on the frame, one end of the frame is sleeved on the support through a rotating connecting structure, so that the front wheel is connected with the rear wheel in a rotating mode, a handle is further arranged on the front wheel support and used for being supported by a hand, and the advancing direction of the bicycle is changed. The existing bicycles can change the direction of the bicycle and ensure the stability of the advancing direction only by manually holding the handle. It is known that for a general rider, when hands of the rider leave the handlebar, the advancing direction of the front wheel can automatically shift, and the risk of accidents caused by the fact that the bicycle deviates from the road exists, so that the bicycle cannot be ridden by the rider without hands.

Disclosure of Invention

The invention aims to provide an automatic steering bicycle, and aims to solve the technical problem that a bicycle cannot be ridden by loose hands of a common rider in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: an automatically steered bicycle comprising: main shaft, first swiveling wheel, second swiveling wheel, the body frame body and connecting axle, the main shaft rotates and sets up the center of first swiveling wheel, the body frame body is fixed on the both ends of main shaft, the second swiveling wheel is provided with two, two the second swiveling wheel rotates respectively and sets up the both ends of connecting axle, the connecting axle with the body frame body rotates and connects, the connecting axle with still be equipped with meshing mechanism between the body frame body, meshing mechanism be used for with body frame body cooperation restriction or drive the direction of second swiveling wheel changes.

In one embodiment, the engagement mechanism comprises: the main gear is fixedly arranged on the main frame body, the driven gear or the rack is fixedly arranged on the connecting shaft, and the main gear is meshed and connected with the driven gear or the rack.

In one embodiment, the master gear and the slave gear are both bevel gears, or the master gear is a cylindrical gear, and the rack is meshed with the cylindrical gear.

In one embodiment, the connecting piece comprises a first connecting plate and a second connecting plate, one end of the first connecting plate is bent and extended to form the second connecting plate, the first connecting plate is rotatably connected with the main frame body, and the second connecting plate is rotatably connected with the connecting shaft.

In one embodiment, a fixing shaft is projected from the main frame body, a first mounting hole for the fixing shaft to pass through is formed in the first connecting plate, the main gear is fixed to one end of the fixing shaft far away from the main frame body, and the first connecting plate is rotatably arranged on the fixing shaft.

In one embodiment, a rotating shaft is convexly arranged on the second connecting plate, a second mounting hole is arranged on the connecting shaft, the connecting shaft is rotatably sleeved on the rotating shaft through the second mounting hole, and the extending direction of the rotating shaft is perpendicular to the extending direction of the fixed shaft.

In one embodiment, the connection shaft includes: the interlude, and respectively with first installation section of both ends articulated and the second installation section of interlude, one the second swiveling wheel rotates to be installed on the first installation section, another the second swiveling wheel rotates to be installed on the second installation section, engagement mechanism includes: the rack is arranged in parallel with the middle section at intervals, the first connecting piece is hinged to one end of the rack, the other end of the rack is hinged to the first mounting section, the second connecting piece is hinged to the other end of the rack, the other end of the second connecting piece is hinged to the second mounting section, and the cylindrical gear is fixed to the main frame body and meshed with the rack.

In one embodiment, the middle section is provided with a third mounting hole, the main frame body is convexly provided with a fixing shaft, the extending direction of the fixing shaft is perpendicular to the extending direction of the middle section, the cylindrical gear is fixed at one end of the fixing shaft far away from the main frame body, and the middle section is rotatably arranged on the fixing shaft.

In one embodiment, the first connecting piece and the first mounting section are both coaxially hinged with the middle section, and the second connecting piece and the second mounting section are both coaxially hinged with the middle section.

In one embodiment, the main frame body comprises a first U-shaped frame body and a second U-shaped frame body, the first U-shaped frame body is horizontally arranged and fixed at two ends of the main shaft, the second U-shaped frame body is vertically arranged on the first U-shaped frame body, and a saddle is arranged at one end of the second U-shaped frame body, which is far away from the first U-shaped frame body.

The invention has the beneficial effects that:

according to the automatic steering bicycle, the three-wheel bicycle is formed by the first rotating wheel and the two second rotating wheels, the bicycle is balanced, the bicycle cannot turn over, the balance of the bicycle is controlled without using hands of a user, meanwhile, the direction of the bicycle is changed by changing the advancing direction of the first rotating wheel, the advancing direction of the first rotating wheel can be changed by the bias of the body of the user, and therefore the bicycle can be ridden by the user with a loose hand. Simultaneously, the direction of the second rotating wheel is limited or driven to change by the matching of the meshing mechanism and the main frame body, so that the coordination of the direction between the second rotating wheel and the first rotating wheel is ensured, and the bicycle can normally and smoothly run.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic structural view of an automatic steering bicycle according to embodiment 1 of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is a schematic partially exploded view of an automatic steering bicycle according to embodiment 1 of the present invention;

FIG. 4 is a schematic structural view of an automatic steering bicycle according to embodiment 2 of the present invention;

FIG. 5 is an enlarged view at B in FIG. 4;

fig. 6 is a schematic partial exploded view of an automatic steering bicycle according to embodiment 2 of the present invention.

Reference numerals: 1. a first rotating wheel; 2. a second rotating wheel; 3. a main frame body; 31. a first U-shaped frame body; 32. a second U-shaped frame body; 33. a fixed shaft; 4. a connecting shaft; 41. a second mounting hole; 42. a middle section; 421. a bump; 4211. a third mounting hole; 43. a first mounting section; 44. a second mounting section; 5. an engagement mechanism; 51. a main gear; 52. a slave gear; 53. a connecting member; 531. a first connecting plate; 5311. a first mounting hole; 532. a second connecting plate; 5321. a rotating shaft; 54. a rack; 55. a first connecting piece; 56. a second connecting sheet; 57. a cylindrical gear; 6. a vehicle seat; 7. a pedal mechanism.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example 1:

as shown in fig. 1 to 3, an embodiment of the present invention provides an automatic steering bicycle, including: the main shaft (not shown in the figure), first swiveling wheel 1, second swiveling wheel 2, the body frame body 3 and connecting axle 4, the main shaft rotates the center that sets up at first swiveling wheel 1, body frame body 3 is fixed on the both ends of main shaft, second swiveling wheel 2 is provided with two, two second swiveling wheels 2 rotate respectively and set up the both ends at connecting axle 4, the centre of connecting axle 4 rotates with body frame body 3 to be connected, still be equipped with engagement mechanism 5 between connecting axle 4 and the body frame body 3, engagement mechanism 5 is used for cooperating the direction that restricts or drive second swiveling wheel 2 with body frame body 3 and changes. In this embodiment, the first rotor 1 is a front wheel and the second rotor 2 is a rear wheel, and in other embodiments, the first rotor 1 is a rear wheel and the second rotor 2 is a front wheel.

In this embodiment, the automatic steering bicycle further comprises a pedal mechanism 7, the pedal mechanism 7 is used for a person to pedal so as to drive the first rotating wheel 1 to run on the ground relative to the main shaft, and the pedal mechanism 7, the main shaft and the first rotating wheel 1 form a single-wheel bicycle structure, so that a chain and chain wheel driving mechanism can be omitted, and the occupied space of the bicycle is reduced. The single-wheel bicycle structure is a single-wheel bicycle structure in the prior art, and the specific structure and the working principle are not stated herein. Of course, in other embodiments, the pedal mechanism 7 may also use a chain and chain wheel driving mechanism to drive the first rotating wheel 1 to rotate relative to the main shaft.

In this embodiment, the bicycle is not provided with a handle, and the first rotating wheel 1 is a front wheel, so the direction of the bicycle is changed by changing the advancing direction of the first rotating wheel 1, and the advancing direction of the first rotating wheel 1 is realized by biasing the body of a person or by applying a biasing force to the main frame body 3 by the person, for example, when turning to the left, the body of the person is biased to the left, so that the main frame body 3 drives the first rotating wheel 1 to bias to the left; when turning to the right, the body of the person is deflected to the right, thereby driving the first rotating wheel 1 to deflect to the right through the main frame body 3. First swiveling wheel 1 is to the left side or the right side in-process, turns into the partial motive power of second swiveling wheel 2 through engagement mechanism 5 with the partial motive power of body frame 3, realizes that second swiveling wheel 2 follows the direction change of first swiveling wheel 1, when first swiveling wheel 1 direction does not change, can restrict the change of second swiveling wheel 2 direction through engagement mechanism 5's meshing effort for the direction of first swiveling wheel 1 and second swiveling wheel 2 keeps unanimous. Therefore, the change of the direction of the bicycle is controlled without using hands, so that the hands are liberated.

According to the automatic steering bicycle provided by the embodiment of the invention, the three-wheeled bicycle is formed by the first rotating wheel 1 and the two second rotating wheels 2, so that the bicycle has balance, the bicycle is not overturned, the balance of the bicycle is controlled without using hands of a person, meanwhile, the direction of the bicycle is changed by changing the advancing direction of the first rotating wheel 1, and the advancing direction of the first rotating wheel 1 can be realized by the bias of the body of the person or the bias force applied by the person, so that the bicycle can be ridden by loosening the hands. Simultaneously, the direction of the second rotating wheel 2 is limited or driven to change by the matching of the meshing mechanism 5 and the main frame body 3, so that the coordination of the direction between the second rotating wheel 2 and the first rotating wheel 1 is ensured, and the bicycle can normally and smoothly run.

As shown in fig. 1-3, in the present embodiment, the main frame 3 includes a first U-shaped frame 31 and a second U-shaped frame 32, the first U-shaped frame 31 is horizontally disposed and fixed at two ends of the main shaft, so that the first rotating wheel 1 can roll relative to the first U-shaped frame 31, the second U-shaped frame 32 is vertically disposed on the first U-shaped frame 31, a seat 6 is disposed at an end of the second U-shaped frame 32 away from the first U-shaped frame 32, and the seat 6 is used for a person to sit, so that the person can conveniently step on the pedal mechanism 7, and a bicycle can move. The first U-shaped frame body 31 is rotatably connected with the connecting shaft 4, and the engaging mechanism 5 is arranged on the first U-shaped frame body 31 and the connecting shaft 4, so that when the first rotating wheel 1 moves, the second rotating wheel 2 is driven to move synchronously. The main frame body 3 is made of steel materials, and the bearing capacity and the deformation resistance of the main frame body are guaranteed.

As shown in fig. 1 to 3, in the present embodiment, the engagement mechanism 5 includes: a master gear 51 fixed on the main frame body 3 and a slave gear 52 fixed on the connecting shaft 4, wherein the master gear 51 is meshed with the slave gear 52. In other embodiments, the engaging mechanism 5 includes a main gear 51 fixed on the main frame 3, and a rack fixed on the connecting shaft 4, and the main gear 51 is engaged with the rack. Specifically, in the present embodiment, the main frame body 3 and the intermediate portion of the connecting shaft 4 are rotatably connected by the connecting member 53. Specifically, the main gear 51 is disposed on the first U-shaped frame 31, and the main gear 51 is disposed horizontally and vertically from the gear 52. The connecting piece 53 is used for realizing the rotating connection between the first U-shaped frame body 31 and the connecting shaft 4, the main gear 51 is meshed with the driven gear 52 and then used for realizing the transmission connection and the limiting effect between the first U-shaped frame body 31 and the connecting shaft 4, on one hand, the rotation between the first U-shaped frame body 31 and the connecting shaft 4 is ensured to have small amplitude, the bicycle is ensured not to easily have the situation of sharp turning in the riding process, and on the other hand, the consistency of the rolling driving directions of the first rotating wheel 1 and the second rotating wheel 2 is ensured.

In the present embodiment, the master gear 51 and the slave gear 52 are both bevel gears. Therefore, the left and right deflection forces of the main frame body 3 can be converted into the horizontal rotating force of the connecting shaft 4 through the two bevel gears which are meshed with each other, so that the consistency of the direction change of the first rotating wheel 1 and the second rotating wheel 2 is realized. In other embodiments, the main gear 51 is a cylindrical gear, and the rack gear is engaged with the cylindrical gear.

As shown in fig. 1 to 3, in the present embodiment, the connecting member 53 includes a first connecting plate 531 and a second connecting plate 532 formed by bending and extending one end of the first connecting plate 531, the first connecting plate 531 is rotatably connected to the main frame body 3, and the second connecting plate 532 is rotatably connected to the connecting shaft 4. Specifically, the included angle between the first connecting plate 531 and the second connecting plate 532 is a right angle, so that the left and right deflection forces of the main frame body 3 are conveniently converted into the horizontal rotating force of the connecting shaft 4, the first connecting plate 531 and the second connecting plate 532 are integrally formed, and the connecting piece 53 is made of a metal material.

As shown in fig. 1 to 3, in the present embodiment, the main frame 3 is provided with a fixing shaft 33 protruding upward, the first connecting plate 531 is provided with a first mounting hole 5311 for the fixing shaft 33 to pass through, the main gear 51 is fixed to an end of the fixing shaft 33 away from the main frame 3, and the first connecting plate 531 is rotatably provided on the fixing shaft 33 between the main gear 51 and the main frame 3. Specifically, the fixing shaft 33 is protruded from one end of the first U-shaped frame 31 away from the first rotating wheel 1, the fixing shaft 33 is rotatably connected to the first connecting plate 531 through the first mounting hole 5311, the fixing shaft 33 is fixedly connected to the main gear 51, the fixing shaft 33 is welded to the main gear 51, or the fixing shaft 33 is horizontally connected to the main gear 51 through a limiting hole, and then a bolt or bolt connection is vertically disposed to sequentially penetrate through the main gear 51 and the fixing shaft 33, so as to fixedly connect the fixing shaft 33 and the main gear 51.

As shown in fig. 1-3, in this embodiment, a rotating shaft 5321 is convexly disposed on a side of the second connecting plate 532 close to the first connecting plate 531, a second mounting hole 41 is disposed on the connecting shaft 4, the connecting shaft 4 is rotatably sleeved on the rotating shaft 5321 through the second mounting hole 41, and an extending direction of the rotating shaft 5321 is perpendicular to an extending direction of the fixing shaft 33. Specifically, the master gear 51 and the slave gear 52 are meshingly connected in the opening between the first connecting plate 531 and the second connecting plate 532, so that the positions of the master gear 51 and the slave gear 52 are defined by the positional relationship between the first connecting plate 531 and the second connecting plate 532, thereby ensuring the stability of meshing between the master gear 51 and the slave gear 52, while also facilitating the installation. The connecting shaft 4 is rotatably sleeved on the rotating shaft 5321 through the second mounting hole 41 to realize rotating connection, and the rotating shaft 5321 has the advantage of convenience in mounting, wherein the rotating shaft 5321 is used for realizing rotating connection of the connecting shaft 4, and is also used for driving the second rotating wheel 2 to move along with the first rotating wheel 1. In the present embodiment, the slave gear 52 and the rotation shaft 5321 are on the same axis, and the fixed shaft 33 and the master gear 51 are on the same axis, which makes the transmission of force between the master gear 51 and the slave gear 52 least effort.

Example 2:

in the present embodiment, the difference from the other embodiments is in the specific structures of the connecting shaft 4 and the engaging mechanism 5, and the specific structures of the connecting shaft 4 and the engaging mechanism 5 will be described in detail below.

As shown in fig. 4 to 6, the connecting shaft 4 includes: the middle section 42, and the first mounting section 43 and the second mounting section 44 hinged with the two ends of the middle section 42 respectively, wherein one second rotating wheel 2 is rotatably mounted on the first mounting section 43, and the other second rotating wheel 2 is rotatably mounted on the second mounting section 44. The second rotor 2 is thus biased to the left or right relative to the intermediate section 42 in preparation for synchronous biasing following the first rotor 1.

As shown in fig. 4 to 6, the engagement mechanism 5 includes: a rack 54 arranged parallel to the intermediate section 42 at a distance therefrom, a first connecting piece 55 having one end hinged to one end of the rack 54 and the other end fixedly connected to the first mounting section 43, a second connecting piece 56 having one end hinged to the other end of the rack 54 and the other end fixedly connected to the second mounting section 44, and a spur gear 57 fixed to the main frame body 3 and engaging with the rack 54. The rack 54 is provided with a plurality of tooth forms at one side close to the cylindrical gear 57 and is used for being meshed with the cylindrical gear 57

Wherein the first connecting piece 55 and the first mounting section 43 are both coaxially hinged with the middle section 42, and the second connecting piece 56 and the second mounting section 44 are both coaxially hinged with the middle section 42. Specifically, it can be understood that the first connecting piece 55 and the first mounting section 43 are integrally formed to have a right-angle structure, and the right-angle portion is hinged to the first mounting section 43, and the second connecting piece 56 and the second mounting section 44 are integrally formed to have a right-angle structure, and the right-angle portion is hinged to the middle section 42. Thus, in the present embodiment, the rack 54, the first connecting piece 55, the middle section 42 and the second connecting piece 56 are hinged to form a parallelogram structure, and the two second rotating wheels 2 are respectively arranged on two corners of the same side, and when the cylindrical gear 57 rotates, the rack 54 is driven to deflect left or right, so that the first mounting section 43 and the second mounting section 44 are driven to deflect left or right through the first connecting piece 55 and the second connecting piece 56, and the two second rotating wheels 2 are deflected.

As shown in fig. 4-6, in the present embodiment, the middle section 42 is provided with a third mounting hole 4211, specifically, the middle section 42 is provided with a protruding block 421, the third mounting hole 4211 is provided on the protruding block 421, the protruding block 421 is integrally formed or welded with the middle section 42, the main frame body 3 is provided with a fixing shaft 33 protruding thereon, the extending direction of the fixing shaft 33 is perpendicular to the extending direction of the middle section 42, the cylindrical gear 57 is fixed on one end of the fixing shaft 33 away from the main frame body 3, and the protruding block 421 rotates on the fixing shaft 33 located between the cylindrical gear 57 and the main frame body 3. The fixed shaft 33 is rotatably connected to the connecting shaft 4, so that the main frame 3 is biased to drive the cylindrical gear 57 to rotate.

The automatic steering bicycle provided by the embodiment of the invention omits a handle structure and a chain and chain wheel driving mechanism, has simple and compact structure, small occupied space, reduced production cost, no chain disengagement, reduced failure rate, reduced maintenance cost and greatly reduced resource loss, can be ridden by people with loose hands, and is convenient for people to take articles.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An automatically steering bicycle, comprising: main shaft, first swiveling wheel, second swiveling wheel, the body frame body and connecting axle, the main shaft rotates and sets up the center of first swiveling wheel, the body frame body is fixed on the both ends of main shaft, the second swiveling wheel is provided with two, two the second swiveling wheel rotates respectively and sets up the both ends of connecting axle, the connecting axle with the body frame body rotates and connects, the connecting axle with still be equipped with meshing mechanism between the body frame body, meshing mechanism be used for with body frame body cooperation restriction or drive the direction of second swiveling wheel changes.

2. An automatically steering bicycle according to claim 1, wherein the engagement mechanism comprises: the main gear is fixedly arranged on the main frame body, the driven gear or the rack is fixedly arranged on the connecting shaft, and the main gear is meshed and connected with the driven gear or the rack.

3. The automatically steering bicycle of claim 2, wherein the master gear and the slave gear are both bevel gears, or the master gear is a cylindrical gear, and the rack gear is engaged with the cylindrical gear.

4. The automatic steering bicycle according to claim 2, wherein the main frame body is rotatably connected to the middle of the connecting shaft through a connecting member, the connecting member includes a first connecting plate and a second connecting plate formed by bending and extending one end of the first connecting plate, the first connecting plate is rotatably connected to the main frame body, and the second connecting plate is rotatably connected to the connecting shaft.

5. The automatically steered bicycle of claim 4, wherein a fixed shaft is projected from the main frame, a first mounting hole is formed in the first connecting plate for the fixed shaft to pass through, the main gear is fixed to an end of the fixed shaft remote from the main frame, and the first connecting plate is rotatably disposed on the fixed shaft.

6. The automatic steering bicycle of claim 5, wherein a rotating shaft is protruded from the second connecting plate, a second mounting hole is formed in the connecting shaft, the connecting shaft is rotatably sleeved on the rotating shaft through the second mounting hole, and the extending direction of the rotating shaft is perpendicular to the extending direction of the fixed shaft.

7. The automatically steering bicycle of claim 1, wherein the connecting shaft comprises: the interlude, and respectively with first installation section of both ends articulated and the second installation section of interlude, one the second swiveling wheel rotates to be installed on the first installation section, another the second swiveling wheel rotates to be installed on the second installation section, engagement mechanism includes: the rack is arranged in parallel with the middle section at intervals, the first connecting piece is hinged to one end of the rack at one end and fixedly connected to the first mounting section at the other end, the second connecting piece is hinged to the other end of the rack at one end and fixedly connected to the second mounting section at the other end, and the cylindrical gear is fixed to the main frame body and meshed with the rack.

8. The automatically steerable bicycle of claim 7, wherein the middle section defines a third mounting hole, the main frame body defines a mounting shaft extending in a direction perpendicular to the direction of extension of the middle section, the cylindrical gear is fixed to an end of the mounting shaft remote from the main frame body, and the middle section is rotatably disposed on the mounting shaft.

9. The automatically steering bicycle of claim 8, wherein the first connecting tab and the first mounting section are both coaxially hinged with the intermediate section, and the second connecting tab and the second mounting section are both coaxially hinged with the intermediate section.

10. The automatic steering bicycle according to any one of claims 1 to 9, wherein the main frame body comprises a first U-shaped frame body and a second U-shaped frame body, the first U-shaped frame body is horizontally arranged and fixed at two ends of the main shaft, the second U-shaped frame body is vertically arranged on the first U-shaped frame body, and a seat is arranged at one end of the second U-shaped frame body, which is far away from the first U-shaped frame body.