CN109305271A

CN109305271A - It is driven separable folding portable bicycle and method for folding

Info

Publication number: CN109305271A
Application number: CN201710633926.8A
Authority: CN
Inventors: 何立
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-07-29
Filing date: 2017-07-29
Publication date: 2019-02-05

Abstract

The invention discloses a kind of separable folding portable bicycle of transmission and method for folding, including vehicle body fold mechanism, front-wheel folding mechanism, rear-wheel fold mechanism, saddle fold mechanism, handlebar folding mechanism, the structure improvement of emphasis is rear-wheel fold mechanism, traditional folding bicycle is got rid of since chain can not fold, cause to be arranged on the vehicle frame of front end at the folding of big plate wheel, in view of horizontal area, cause big plate wheel in design close to flywheel, so that the optimal design of body mechanics can not be added.The present invention has carried out technological improvement at transmission, transmission device is completely separated completely, get rid of the position limitation of axis, pass through the main points of body mechanics, more preferably find the optimal design position of axis, it ensures the body state ridden for a long time, by repeatedly proving, proposes a kind of conveniently method for folding.

Description

It is driven separable folding portable bicycle and method for folding

Technical field

The invention patent belongs to portable folding bicycle field, and in particular to a kind of separable folding portable of transmission Bicycle and method for folding.

Background technique

Bicycle is a good motion mode for the outdoor sportsmen ridden, for bus station and purpose The people of the traveler of last one kilometer between ground either short distance trip are also a kind of relatively good walking-replacing tool, and are rolled over For folded bicycle because its is foldable, occupied space is smaller, easy to carry more widely to be used.It is existing on the market at present to roll over Folded bicycle, has had reached the requirements such as small in size, light, easy to carry, easy to operate to a certain extent.But at present There is Collapsible bicycle on sale following technical point to improve in the market:

1, the defective tightness of folded vehicle body fitting, horizontal occupy-place is bigger, and the folded shape of each component is not regular enough, It is stored inconveniently and carries；

2, due to considering the problems of not folding or fall off at chain when folding, folding point is located at large fluted disc front end by the prior art Vehicle frame on, in order to avoid folded area is excessive, the prior art is by shortening between large fluted disc and the flywheel of rear wheel The technical solution of distance reduces folded horizontal area, and when riding by the present of organization of human body, seat and handlebar It is smaller apart from adjustable extent, the angle of the line and vertical line that lead to seat and large fluted disc becomes smaller, for body mechanics' angle, It is unsuitable for riding for a long time；

3, due to considering the problems of not folding or fall off at chain when folding, the prior art also adds chain stretching device, To guarantee that chain will not loosen when folding, but the program leads to the more complicated structure of vehicle, manufacture and the increased costs safeguarded, And it is more inconvenient when folding；

The mode of folding: existing technology can not change driving-transmission-it is driven between separation problem.

Summary of the invention

In view of the above technical problems, at least when folding the problem of chain releasing, the invention proposes after a kind of folding Horizontal area it is smaller, shape is more regular, convenient for storing and carrying, without having to worry about the bicycle of chain releasing, the invention is more Meet body mechanics, structure is more compact.

To achieve the above object, the present invention adopts the following technical scheme that, is driven separable folding portable bicycle, packet Include vehicle body fold mechanism, handlebar folding mechanism, front-wheel folding mechanism, rear-wheel fold mechanism, saddle fold mechanism, structural feature It is:

Vehicle body fold mechanism folds vehicle body, overlaps the vehicle body between front wheels and rear wheels, the vehicle body fold mechanism Including front-axle beam, attachment beam, the back rest, the upper end of front-axle beam is equipped with vertical shaft axle sleeve, and lower end passes through the first folding hinge component and attachment beam Upper end connection, the lower end of attachment beam is connected by the front end of the second folding hinge component and the back rest；

Front-wheel folding mechanism folds front-wheel, the front-wheel is made to be overlapped in the side of folded vehicle body, the front-wheel folding machine Structure includes vertical shaft, vertical shaft seat, folds arm, fixed arm, and the lower end of vertical shaft is fixedly connected with vertical shaft seat, folds the upper end of arm by turning The lock connection of the lower end of axis and vertical shaft seat folds the lower end of arm and is connected by shaft and fixed arm lock, the lower end of fixed arm with The front axle of front-wheel is fixedly connected, and vertical shaft is connect with the vertical shaft axle sleeve bearing of vehicle body fold mechanism；

Rear-wheel fold mechanism, stowed rear wheels make the rear-wheel be overlapped in the other side of folded vehicle body, the rear-wheel folding machine Structure includes driving box, transmission case, and driving box is fixedly connected with the back rest, and driving gear and mesomerism gear, driving are equipped in driving box Gear is fastenedly connected on the back rest of the vehicle body fold mechanism by axis, axis with driving gear be fixedly connected, axis with The connection of back rest bearing, the both ends of axis are connected with crank, and the other end of crank is equipped with rotatable and folding foot pedal, in Jie's gear is fixedly mounted in driving box by shaft, and driving gear engages connection with mesomerism gear, is equipped with toothed chain in transmission case Combined wheels, flywheel, toothed chain combined wheels are fixedly mounted in transmission case by shaft, and toothed chain combined wheels include gear and coaxial drive Sprocket wheel, sprocket wheel connect by transmission chain with flywheel, and flywheel is fixedly mounted in transmission case by shaft, flywheel and coaxial drive Rear-wheel be fixedly connected, mesomerism gear engages connection with the gear in toothed chain combined wheels, and driving box and transmission case are in mesomerism gear Third folding hinge component is equipped with the gear engagement place in toothed chain combined wheels；

Saddle fold mechanism, foldable saddle are overlapped in saddle between folded front wheels and rear wheels, the saddle fold mechanism Including seat bar, the top of seat bar is equipped with saddle, and the lower section of seat bar is connect with seat rod bearing shaft, and seat rod bearing is installed on the back rest The rear side of side.

Preferably, the handlebar folding mechanism include staking, left hinge ear, right hinge ear, manage, the upper end of staking Equipped with lock collar, lock collar intermediate vertical disk is equipped with hinge ear shaft, and the vertical disk in lock collar upper end is equipped with upper locating piece, and lock collar lower end is hung down Straight disk is equipped with lower locating piece, and the disk of lock collar is equipped with lock pillar, is equipped among the left hinge ear and right hinge ear and hinge ear shaft phase Corresponding through-hole, lock collar are successively rotatablely connected with right hinge ear and left hinge ear by hinge ear shaft, the right disk for cutting with scissors ear equipped with The corresponding lockhole of the lock pillar of lock collar, disk of the left hinge ear close to right hinge ear side are equipped with lock pillar corresponding with lockhole, institute It states hinge ear spindle central and is equipped with through-hole, the left hinge ear, right hinge ear are fastenedly connected with pipe respectively.

Further, the handlebar folding mechanism further includes handle bar folding locking device, and handle bar folding locking device includes connecting Extension bar, connecting rod are connect close to lock collar one end with screwed retaining ring, and the other end is fixedly connected with the shaft of spanner, the spanner It is eccentric design at shaft.

Further, the connecting rod close to nut end is additionally provided with baffle, spring emits, return spring, the other end of connecting rod It is additionally provided with cover plate, slide plate, the front end of spanner is equipped with anticreep card, the anticreep card that spanner is corresponded to behind vertical upper end is equipped with anti- Off card film trap.

Preferably, tension spring is equipped between the lock collar and right hinge ear, right hinge ear and left hinge ear.

Preferably, the section that pipe is intersected with hinge ear is scarf.

Preferably, the saddle fold mechanism is additionally provided with vehicle seat locked component, and the lock ring of vehicle seat locked component is mounted on On seat bar, the unlock of vehicle seat locked component is partly installed in the upper end above the back rest.

The method for folding of the separable folding portable bicycle of transmission, includes the following steps:

S1. bicycle is in the open state, first folds foot pedal；

S2. handlebar lock is opened, handle bar folding is got up, closes handlebar lock；

S3. third folding hinge component is opened, buttresses saddle and take advantage of a situation and is dropped to left rear side, at this point, rear-wheel is close to the side of the back rest Face；

S4. after rear-wheel fitting, it is put into bicycle, rear-wheel is made to be affixed to ground;

S5. the lock on vertical shaft seat and fixed arm is opened, takes advantage of a situation and is lifted up front-wheel, front-wheel is made to fit with vertical shaft；

S6. the first folding hinge component and the second folding hinge component are opened, front-axle beam is lifted, taking advantage of a situation pastes front-axle beam closely with the back rest It closes；

S7. the vehicle seat lock on saddle is opened, saddle is transferred between two-wheeled；

So far, entire folding process is completed.

Folded bicycle can be wrapped up directly with dust cover and be stored, and folded bicycle vertical can also be risen Come, the front and back wheel of bicycle is rotatable at this time, is conducive to carry.

The process of folded bicycle expansion is opposite with the process of folding.

Compared with the prior art, the invention has the following advantages:

1, folding point passes through excellent design, is properly fit onto folded vehicle body between the two-wheeled of front and back, folded level Area is only the horizontal area of tire, and folded shape is very regular, is conducive to store and carry.

2, traditional folding bicycle is got rid of since chain can not fold, and leads to that front end is arranged at the folding of big plate wheel On vehicle frame, it is contemplated that horizontal area causes big plate wheel in design close to flywheel, sets so that the optimal of body mechanics can not be added Meter.The present invention has carried out technological improvement at transmission, is completely completely separated transmission device, gets rid of the position limitation of axis, By the main points of body mechanics, the optimal design position of axis is more preferably found, it is ensured that the body state ridden for a long time.

3, technological improvement has been carried out at transmission, without adding the tensioning of the chain device, reduces answering for the structure of vehicle Miscellaneous degree, the cost for reducing manufacture and maintenance, the program for simplifying folding.

4, by the technological improvement of many places, optimize driving-transmission-it is driven between separation problem, thoroughly change Traditional folding means.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of vehicle unfolded state of the present invention；

Fig. 2 is the structural schematic diagram of rear-wheel fold mechanism of the present invention；

Fig. 3 is the top view cross-sectional structural schematic diagram of rear-wheel fold mechanism of the present invention；

Fig. 4 is the assembling schematic diagram of handlebar folding mechanism of the present invention；

Fig. 5 is the unfolded state structural schematic diagram of front-wheel folding mechanism of the present invention；

Status architecture schematic diagram when Fig. 6 is the folding of front-wheel folding mechanism of the present invention；

Fig. 7 is status architecture schematic diagram after the folding of front-wheel folding mechanism of the present invention；

Fig. 8 is the unfolded state structural schematic diagram of saddle fold mechanism of the present invention；

Fig. 9 is status architecture schematic diagram after the folding of saddle fold mechanism of the present invention；

Figure 10 is locking device structure schematic diagram of the present invention；

In figure: 101- front-axle beam, 102- attachment beam, the 103- back rest, the first folding hinge of 104- component, the second folding hinge of 105- Component, 201- vertical shaft, 202- vertical shaft seat, 203- fold arm, 204- fixed arm, 205- front-wheel, 301- driving box, 302- transmission Case, 303- drive gear, 304- mesomerism gear, 305- axis, 306- crank, 307- foot pedal, 308- toothed chain combined wheels, 309- Flywheel, 310- transmission chain, 311- rear-wheel, 312- third folding hinge component, 401- bars, 402- saddle, 403- rod bearings, 404- vehicle seat locked component, 501- cut with scissors staking, the left hinge ear of 502-, the right hinge ear of 503-, 504- pipe, 505- lock collar, 506- Locating piece, 509- lock pillar, 510- lockhole, 601- extension bar, 602- nut, 603- gear under the upper locating piece of ear shaft, 507-, 508- Piece, 604- spring emit, 605- return spring, 606- spanner, 607- shaft, 608- slide plate, 609- cover plate, 7- tension spring.

Specific embodiment

The present invention is further explained below in conjunction with specific embodiment, but the not limitation present invention, is said Structure, ratio, size depicted in bright book attached drawing etc., only to cooperate the revealed content of specification, for being familiar with this skill The personage of art understands and reads, and is not intended to limit the invention enforceable qualifications, therefore does not have technical essential meaning, The modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the effect of present invention can be generated and institute's energy Under the purpose reached, should all still it fall in the range of disclosed technology contents can cover.Meanwhile in this specification Cited such as "upper", "lower", "front", "rear", " centre " term are merely convenient to being illustrated for narration, rather than to limit The enforceable range of the present invention, relativeness are altered or modified, under the content of no substantial changes in technology, when being also considered as this hair Bright enforceable scope.

It is driven separable folding portable bicycle, including vehicle body fold mechanism, rear-wheel fold mechanism, handlebar folding Structure, front-wheel folding mechanism, saddle fold mechanism, folded bicycle overall plan are vehicle body in centre, and two sides are after folding Front-wheel and folded rear-wheel.

The specific scheme is that

As shown in Figure 1, vehicle body fold mechanism includes front-axle beam (101), attachment beam (102), the back rest (103), the upper end of front-axle beam (101) Equipped with vertical shaft axle sleeve, lower end is connect by the first folding hinge component (104) with the upper end of attachment beam (102), attachment beam (102) Lower end connect with the front end of the back rest (103) by the second folding hinge component (105), before folded vehicle body can overlap It takes turns between (205) and rear-wheel (311)；

As shown in Figures 2 and 3, rear-wheel fold mechanism includes driving box (301), transmission case (302), driving box (301) and the back rest (103) it is fixedly connected, driving gear (303) and mesomerism gear (304) is equipped in driving box (301), driving gear (303) passes through Axis (305) is fastenedly connected on the back rest (103) of the vehicle body fold mechanism, and axis (305) and driving gear (303) are fixed Connection, axis (305) are connect with the back rest (103) bearing, and the both ends of axis (305) are connected with crank (306), crank (306) The other end, which is equipped with, can be rotated and folding foot pedal (307), mesomerism gear (304) are fixedly mounted on driving box by shaft (301) in, connection is engaged in driving gear (303) with mesomerism gear (304), is equipped with toothed chain combined wheels in transmission case (301) (308), flywheel (309), toothed chain combined wheels (308) are fixedly mounted in transmission case (302) by shaft, toothed chain combined wheels It (308) include gear and the sprocket wheel coaxially driven, sprocket wheel is connect by transmission chain (310) with flywheel (309), and flywheel (309) is logical It crosses shaft to be fixedly mounted in transmission case (302), flywheel (309) is fixedly connected with the rear-wheel (311) coaxially driven, mesomerism gear (304) connection is engaged with the gear in toothed chain combined wheels (308), driving box (301) and transmission case (302) are in mesomerism gear (304) third folding hinge component (312), folded rear-wheel weight are equipped with the gear engagement place in toothed chain combined wheels (308) It is laminated on the side of folded vehicle body；

As illustrated in figs. 5-7, front-wheel folding mechanism includes vertical shaft (201), vertical shaft seat (202), folds arm (203), fixed arm (204), the lower end of vertical shaft (201) is fixedly connected with vertical shaft seat (202), and the upper end for folding arm (203) passes through shaft and vertical shaft seat (202) lower end latches connection, and the lower end for folding arm (203) is connected by shaft and fixed arm (204) lock, fixed arm (204) lower end is fixedly connected with the front axle of front-wheel (205), and the vertical shaft axle sleeve bearing of vertical shaft (201) and vehicle body fold mechanism connects It connects, folded front-wheel is overlapped in the other side of folded vehicle body；

As shown in FIG. 8 and 9, saddle fold mechanism includes seat bar (401), and the top of seat bar (401) is equipped with saddle (402), seat bar (401) lower section is connect with seat rod bearing (403) shaft, and seat rod bearing (403) is installed on the rear side above the back rest (103), is Stable saddle (402) are additionally provided with vehicle seat locked component on saddle fold mechanism, and the lock ring of vehicle seat locked component installs present bar (401) on, the unlock of vehicle seat locked component is partly installed in the upper end above the back rest (103), and folded saddle is overlapped in folding Between the front-wheel (205) and rear-wheel (311) of poststack；

As shown in figure 4, having carried out completely new design, handlebar folding to handlebar to preferably handlebar be allowed to fit with vehicle Structure include staking (501), left hinge ear (502), right hinge ear (503), manage (504), the upper end of staking (501) is equipped with Lock collar (505), lock collar (505) intermediate vertical disk are equipped with hinge ear shaft (506), and the vertical disk in lock collar (505) upper end is equipped with upper Locating piece (507), the vertical disk in lock collar (505) lower end are equipped with lower locating piece (508), and the disk of lock collar (505) is equipped with lock pillar (509), through-hole corresponding with hinge ear shaft (506), lock collar are equipped among the left hinge ear (502) and right hinge ear (503) (505) it is successively rotatablely connected with right hinge ear (503) and left hinge ear (502) by hinge ear shaft (506), the disk of right hinge ear (503) Face is equipped with lockhole (510) corresponding with lock pillar (509) of lock collar (505), and left hinge ear (502) is close to right hinge ear (503) one The disk of side is equipped with lock pillar (509) corresponding with lockhole (510), and left hinge ear (502), right hinge ear (503) are respectively and pipe (504) it is fastenedly connected, pipe (504) is being designed as scarf with the section that ear intersects is cut with scissors.In order to safer, handlebar folding It is mounted with that handle bar folding locking device, handle bar folding locking device include connecting rod (601) on structure, cuts with scissors ear shaft (506) center Equipped with through-hole, connecting rod (601) is penetrated from hinge ear shaft (506) center, and connecting rod (601) is close to lock collar (505) one end and prevents De- nut (602) connection, the other end are fixedly connected with the shaft (607) of the fastening end of spanner (606), the fastening of spanner (606) It is designed for eccentric shaft at end.It is more convenient in order to operate, connecting rod (601) close to nut (602) end be additionally provided with baffle (603), Spring emits (604), return spring (605), and the other end of connecting rod (601) is additionally provided with cover plate (609), slide plate (608), in lock collar (505) tension spring (605) are equipped between right hinge ear (503), right hinge ear (503) and left hinge ear (502), wherein Hui Li Spring (605) plays the role of the limitation between lock pillar (509) and lockhole (510) and positions, and tension spring (605) can make vehicle More smooth when folding.For further security consideration, it is equipped with anticreep card in the front end of spanner (606), in handle The anticreep card that spanner is corresponded to behind staking (501) upper end is equipped with anticreep card slot, anticreep card and anticreep card slot phase Interaction prevents spanner to be opened accidentally.

First folding hinge component (104), the second folding hinge component (105), front-wheel folding mechanism folding in above scheme The upper end of folded arm and the lock mode of vertical shaft seat (202) are that folding bicycle Quick release common in the market latches.

As shown in Figure 10, third folding hinge component (312), front-wheel folding mechanism fold the lock of arm and fixed arm (204) Tight mode, locking mode of saddle fold mechanism etc. are this kind of locking mode.

S1. bicycle is in the open state, first folds foot pedal, foot pedal and crank will be received in after folding two-wheeled it Between, moreover, if foot pedal will affect the folding of two-wheeled below without first folding；

S2. handlebar lock is opened, handle bar folding is got up, handlebar is closed and latches, after handle bar folding, front-wheel can carried out into one The folding of step；

S3. third folding hinge component is opened, buttresses saddle and take advantage of a situation and is dropped to left rear side, at this point, rear-wheel is close to the side of the back rest Face, but bicycle is still within upright state, is convenient for subsequent operation；

S4. after rear-wheel fitting, it is put into bicycle, rear-wheel is made to be affixed to ground, it is more convenient in the folding for carrying out front-wheel at this time；

S7. the reason of vehicle seat lock on opening saddle, saddle is transferred between two-wheeled, and saddle is placed on last folding is, if preceding Face is wanted to shove along after folding, and saddle can be helped to carry out at this time, more convenient in this way；

So far, entire folding process is completed.

It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims

1. being driven separable folding portable bicycle, including vehicle body fold mechanism, front-wheel folding mechanism, rear-wheel folding machine Structure, saddle fold mechanism, handlebar folding mechanism, it is characterised in that:

Vehicle body fold mechanism includes front-axle beam, attachment beam, the back rest, and the upper end of front-axle beam is equipped with vertical shaft axle sleeve, and lower end is folded by first The lower end of the connection of the upper end of hinge component and attachment beam, attachment beam is connected by the front end of the second folding hinge component and the back rest；

Front-wheel folding mechanism includes vertical shaft, vertical shaft seat, folds arm, fixed arm, and the lower end of vertical shaft is fixedly connected with vertical shaft seat, is folded The upper end of arm is latched by the lower end of shaft and vertical shaft seat and is connected, and the lower end for folding arm is connected by shaft and fixed arm lock, The lower end of fixed arm is fixedly connected with the front axle of front-wheel, and vertical shaft is connect with the vertical shaft axle sleeve bearing of vehicle body fold mechanism；

Rear-wheel fold mechanism includes driving box, transmission case, and driving box is fixedly connected with the back rest, be equipped in driving box driving gear and Mesomerism gear, driving gear are fastenedly connected on the back rest of the vehicle body fold mechanism by axis, and axis and driving gear are solid Fixed connection, axis are connect with back rest bearing, and the both ends of axis are connected with crank, and the other end of crank, which is equipped with, can be rotated and can roll over Folded foot pedal, mesomerism gear are fixedly mounted in driving box by shaft, and driving gear engages connection with mesomerism gear, are driven Toothed chain combined wheels, flywheel are equipped in case, toothed chain combined wheels are fixedly mounted in transmission case by shaft, and toothed chain combined wheels include tooth Wheel and the sprocket wheel coaxially driven, sprocket wheel are connect by transmission chain with flywheel, and flywheel is fixedly mounted in transmission case by shaft, are flown Wheel is fixedly connected with the rear-wheel coaxially driven, and mesomerism gear engages connection, driving box and transmission with the gear in toothed chain combined wheels Gear engagement place of the case in mesomerism gear and toothed chain combined wheels is equipped with third folding hinge component；

Saddle fold mechanism includes seat bar, and the top of seat bar is equipped with saddle, and the lower section of seat bar is connect with seat rod bearing shaft, seat bar Support is installed on the rear side above the back rest；

Handlebar folding mechanism is connected with the vertical shaft of front-wheel folding mechanism.

2. the separable folding portable bicycle of transmission according to claim 1, it is characterised in that: the handle bar folding Mechanism include staking, left hinge ear, right hinge ear, managing, the upper end of staking equipped with lock collar, lock collar intermediate vertical disk is set Hinged ear shaft, the vertical disk in lock collar upper end are equipped with upper locating piece, and the vertical disk in lock collar lower end is equipped with lower locating piece, the disk of lock collar Face is equipped with lock pillar, and through-hole corresponding with hinge ear shaft is equipped among the left hinge ear and right hinge ear, and lock collar passes through hinge ear shaft It is successively rotatablely connected with right hinge ear and left hinge ear, the disk of right hinge ear is equipped with lockhole corresponding with the lock pillar of lock collar, left hinge Disk of the ear close to right hinge ear side is equipped with lock pillar corresponding with lockhole, and the hinge ear spindle central is equipped with through-hole, described Left hinge ear, right hinge ear are fastenedly connected with pipe respectively.

3. the separable folding portable bicycle of transmission according to claims 1 and 2, it is characterised in that: state handlebar folding Folded mechanism further includes handle bar folding locking device, and handle bar folding locking device includes connecting rod, connecting rod close to lock collar one end with Screwed retaining ring connection, the other end are fixedly connected with the shaft of spanner, are eccentric design at the shaft of the spanner.

4. the separable folding portable bicycle of transmission according to claim 2, it is characterised in that: the connecting rod is leaned on Close nut end is additionally provided with baffle, spring emits, return spring, and the other end of connecting rod is additionally provided with cover plate, slide plate, and the front end of spanner is set There is anticreep card, the anticreep card that spanner is corresponded to behind vertical upper end is equipped with anticreep card slot.

5. the separable folding portable bicycle of transmission according to claim 2, it is characterised in that: the lock collar and the right side Tension spring is equipped between hinge ear, right hinge ear and left hinge ear.

6. the separable folding portable bicycle of transmission according to claim 2, it is characterised in that: described pipe and hinge The section of ear intersection is scarf.

7. the separable folding portable bicycle of transmission according to claim 1, it is characterised in that: the saddle folding Folded mechanism is additionally provided with vehicle seat locked component, and the lock ring of vehicle seat locked component is installed on present bar, the solution lock section of vehicle seat locked component Divide the upper end being installed on above the back rest.

8. the method for folding of the separable folding portable bicycle of transmission described in, includes the following steps:

S1. bicycle is in the open state, first folds foot pedal；

S4. after rear-wheel fitting, it is put into bicycle, rear-wheel is made to be affixed to ground；

So far, entire folding process is completed.