CN1023986C - Intraframe folding bicycle - Google Patents

Abstract

A foldable bicycle is provided, when in a normal upright position, a front wheel (6) backwardly turns 180 degrees with a handhold subassembly (700), the rotation is prevented in the position, and the handhold members (701, 702) are downwardly folded to sustain the upper members of the corresponding front frame. A left crank subassembly (500) is removed. After being loosened, a rear wheel forwardly slides along two guide plates and is fixed again. Then a front wheel (6) is removed. A front frame subassembly and a rear frame subassembly (300 and 200) are mutually rolled in each other around a pivot bearing (203), therefore, two members of the front frame subassembly move to a place between two seat pillars and two rear forks, and the rear wheel moves to a place between two members of the front frame subassembly, then moves to a place between two upper members till reaching the stop position. The total time is 45 seconds.

Description

Intraframe folding bicycle

The present invention relates to the folding type bicycle, this car be standard-sized and rapidly folding that is to say so that in automobile, aircraft or city motor bus, carry, when depositing, can occupy minimum space.

The bicycle of prior art needs sizable space when folding.For example US Patent 4,441, No. 729, between trailing wheel and seat pipe sizable space arranged.

The object of the present invention is to provide a kind of folding type bicycle, its wheel (for example 28 inches wheels) can be rapidly compactly folding in vehicle frame, so that in automobile, aircraft or city motor bus, carry, or leave in the minimum space, but the while has kept the size and the feature of ordinary bicycle again.

The present invention is reduced to area with the volume of folding type bicycle and roughly is equivalent to trailing wheel, and width is attained the width that is equivalent to back fork of bicycle greatly.This realizes by following manner: hind axle is contained in two after-frame triangles of cycle frame, therefore, trailing wheel can move forward in these two triangles.The folding preceding sprocket wheel propeller boss of coaxial construction can make trailing wheel further move forward, and simultaneously the side arm member is folded down from propeller boss.The two-seater pipe also can make trailing wheel further move forward between left and right seat pipe, makes side arm fold into after-frame around its common axis between two pipes simultaneously, and this trailing wheel is between the preceding frame member.

The present invention has following three major advantages: owing to foldable bicycle in vehicle frame has kept the diamond structure of experiencing all sorts of time check of bicycle, thereby guaranteed the stability of vehicle frame 1.; 2. vehicle frame has only a pivot point during folding; 3. the car behind the folding is little and compact, indistinctively greater than the trailing wheel of bicycle.

Brief description of drawings;

Fig. 1 is the block diagram that bicycle of the present invention is in its mode of operation;

Fig. 2 is the exploded view of bicycle of the present invention;

Fig. 3 is the front elevation behind the bicycle folding of the present invention;

Fig. 4,5a, 5b, 11a, 11b are the detail drawings of preceding sprocket wheel propeller boss branch unit and relevant each parts;

Fig. 6 to 9 is detail drawings of each crank branch unit;

Figure 10 a, 10b are backpedalling brake bar and cycle frame bonded assembly details;

Figure 12 is the front elevation of lady's bicycle side arm branch unit;

Figure 13 a, 13b are the views of preceding sprocket shaft;

Figure 14 is the view of right crank of folding type and pedal;

Figure 15 a-e represents that the various of folding type bicycle of the present invention may structure.

The explanation of preferred embodiment:

Above-mentioned accompanying drawing is represented bicycle 2, and it has vehicle frame 4, front-wheel 6, trailing wheel 8, vehicle seat 11, handgrip branch unit 700, front fork 16 and rear wheel drive system 10.

Vehicle frame 4 is made up of side arm branch unit 300 and triangle after-frame branch unit 200.Frame member can have circle, and is square, the combination of rectangular cross section or above-mentioned various cross-sectional planes.

The side arm branch unit is made up of two upper members 301,302 and two lower members 303,304.Two upper members 301,302 are spaced from each other in the horizontal and with respect to the vertical plane symmetry of bicycle, front end separately is fixed in the upper end of front fork sleeve 313.The lower end (seeing Figure 15 d) of front fork sleeve then is fixed in the upper end of two members 303,304.

Between two upper members 301 and the 302 and space between two lower members 303 and 304 should be able to make rear tyre therefrom pass.The outside width of two upper members 301,302 and two lower members 303,304 should be able to make it pass between two after-frame triangles of triangle after-frame branch unit 200.

The rearmost end of each upper member 301,302 is fixed in a pivot block 311, one sidewise hole 312 is arranged on the pivot block, can pack into the pin axial sleeve 203 of triangle after-frame branch unit, thereby form one by hole 312 and cover 203 bearings of forming, side arm branch unit 300 and triangle after-frame branch unit 200 are bonded together by pivot.Pivot block 311 also is used as the adjustable support part 3 of vehicle seat or the attachment point of non-adjustable supporting member 5.

The right side inner member 404 of preceding sprocket wheel propeller boss branch unit 400 is fixed in the lower end of the right lower member 304 of side arm branch unit, and left side inner member 403 then is fixed in the lower end of lower-left member 303.

Front fork sleeve 313 is equipped with a kind of ball bearing of main shaft commonly known in the art, and front fork 16 just is contained in this bearing.

Triangle after-frame branch unit 200 is made up of a pin axial sleeve 203 and an after-frame tie bolt 205 that left and right triangle 201 and 202, has axial hole 204.There is a screw 207 at the angle of going up most at left triangle 201, and at the angle of going up most of right triangle 202 not threaded hole 208 is arranged.Pin axial sleeve 203 is installed between the hole 207,208 of two triangle 201,202, and it is axially perpendicular to the vertical plane of bicycle, and it is the receiving device of side arm branch unit 300.After-frame tie bolt 205 at first passes hole 208, passes the hole 204 in the pin axial sleeve 203 then, then screws in screw 207, thereby two triangle is fixed together with pin axial sleeve as therebetween spacer on side direction.

Each triangle 201 and 202 is all by separately seat pillar 209,210, vehicle seat brace 211,212 separately, back vent member 213,214 separately, trailing wheel receiving device 215,216 separately, and 401,402 compositions of preceding sprocket wheel propeller boss external member separately, trailing wheel receiving device 215,216 is provided with dump tank and leads to each triangle inside.

Near the trailing wheel receiving device 216 on right side, right back triangle 202 is provided with the anchor fitting 206 that can accept chain frame 217.Chain frame 217 remains on the control position messenger chain 40, when trailing wheel 8 makes messenger chain 40 automatically by 42 engagements of back sprocket wheel when the folded position of its front end is shifted to its control position.When mode of operation, chain frame 217 does not contact with messenger chain 40.

In the trailing wheel receiving device 215 of after- frame triangle 201 and 202 and 216 and be parallel between the corresponding seat pillar 209 and 210 of bicycle vertical plane, each after-frame triangle is respectively equipped with the trailing wheel guide plate 219 and 220 of a trough of belt, groove 221 and 222 on guide plate is respectively the extendible portion of the groove of trailing wheel receiving device, along groove 221 and 222, hind axle and trailing wheel move in the time of can or launching at folding.

Trailing wheel guide plate 219 and 220 also has other effect, promptly when with rear frame member 303 and 304 and be separately fixed at inner member 403 and 404 on it when after-frame branch unit 200 is folded down, with the trailing wheel that tightens in anteposition on guide plate, two after- frame triangles 201 and 202 are fixed together.

If bicycle rear has backpedalling brake, then as can be known from prior art, backpedalling brake bar 19 is not fixed on the cycle frame, but as Figure 10 a, be contained in the groove 221 of trailing wheel guide plate 219 by guide pin bushing 20 shown in the 10b, when trailing wheel moved forward and backward, restrictor bar 19 slided with wheel by the guide pin bushing that is contained in the groove 221.

Before sprocket wheel propeller boss branch unit 400 by five coaxial detouchable relateds parts, promptly left and right external member 401 and 402, left and right inner member 403 and 404 and one intermediate member 417 are formed.As shown in Figure 4, by the inboard separately seat 405 and 406 of external member 401 and 402, with inner member 403 and 404 separately the outside projection 407 and 408 match, and borrow and seat 409 and 410 that inner member 403 and 404 is inboard separately, match with the diameter of intermediate member 417, above-mentioned five members coaxially are assembled together.The branch unit that this is coaxial when axially being pulled in a time-out, can guarantee the concentricity of the preceding sprocket wheel propeller boss branch unit of vehicle frame at full load, thereby only needs less axial force to be assembled together, and the loading and unloading of propeller boss are simple and easy to do.

Because sprocket wheel propeller boss branch unit 400 before this.Can inner member 403 and 404 be installed in its external member 401 and 402 separately, make inner member 403 and 404 to rotate.Therefore, as Figure 11 a, shown in the 11b, annular protrusion 407 and 408 can be assemblied in respectively in external member 401 and 402 by spring coil 418.In this modification, shown in Figure 15 c, be fixed on the front fork sleeve lower member removable jew.In the structure shown in Figure 15 a and Figure 15 b, two lower members are fixed in front fork sleeve by the connecting device that can pivot.For some cycle frame size, structure can't realize shown in Figure 15 d.

Each external member 401 and 402 inboard are equipped with one respectively and are formed semi-round pod above the backing block.At Fig. 5 a, drawn among the 5b external member 401 and backing block 413 thereof with and on semicircle pod 415.The radius of each pod equates with the main radius of inner member 403 and 404, thereby when launching bicycle, just before joint, each inner member contact pod separately, the resistance of formation to rotating, and the mutual rotation by side arm branch unit and after-frame branch unit, make it further separately, thereby overcome the resistance that lower member 303 and 304 causes, each inner member is engaged in respectively in the pod of respective stop piece, force each inner member axially to enter separately external member to one of the lower member prestrain outside with respect to inner member, thus the connection of between side arm branch unit and after-frame branch unit, setting up rigidity.

The chain wheel drive system 10 of bicycle is mainly by preceding sprocket wheel, two cranks and pedal, and an axle, messenger chain 40 and back sprocket wheel 42 are formed.Two branch units that axially can divide, promptly left crank branch unit 500 and preceding sprocket wheel branch unit 600 have been formed the front portion of drive system.

As shown in Figure 6, left crank branch unit 500 is by left-hand tread plate 501, left crank 502, and left crank shaft 503, preceding sprocket wheel propeller boss tie bolt 505, spring washer 506, cover of dust 507, spacer ring 509 and ball bearing of main shaft 511 are formed.On the axle 503 hole 504 of accepting tie bolt 505 is arranged.Spring washer 506 is positioned under the head of tie bolt 505.

Cover of dust 507 has an axial hole 508, and cover of dust 507 screws in left crank in the prior art manner known.Because the diameter in hole 508 enters but can hold hex drive tool less than the diameter of tie bolt 505 heads, thereby bolt 505, packing ring 506 can be fixed in the left crank branch unit 500, and rotatable bolt 500.As shown in Figure 8, the thread end of bolt 505 exceeds the end of axle 503, so bolt 505 can screw in the corresponding screw in the preceding sprocket wheel branch unit 600.As shown in Figure 6, axle 503 is provided with radial teeth, engages with radial teeth on the axle 603 shown in Figure 7.

In the bearing seat 411 of sprocket wheel propeller boss branch unit 400, the diameter of axle 503 should make its inner ring that can push away ball bearing of main shaft 511, the periphery of touching inner ring up to spacer ring 509 before ball bearing of main shaft 511 press fit over.By bolt 505, left crank branch unit 500 is connected in preceding sprocket wheel branch unit 600.

Another kind method (not drawing) is that ball bearing of main shaft 511 was installed on axle at 503 o'clock, makes spacer ring 509 prop up the circumference of ball bearing of main shaft inner ring, then this assembly is pushed the chain wheel hub, thereby the outer ring of ball bearing of main shaft is pushed in the bearing seat 411.

As shown in Figure 7, preceding sprocket wheel branch unit 600 is by preceding sprocket shaft 603, preceding sprocket wheel 604, and right-hand tread plate 601, right crank 602 and ball bearing of main shaft 605 are formed.Preceding sprocket wheel is fixed in or removable jew is fixed in axle 603.Right crank 602 is fixed in or removable jew is fixed in sprocket wheel 604 or axle 603.When adopting removable jew fixedly, as shown in figure 14, can crank 602 be fixed in sprocket wheel branch unit 600 by articulated manner, make it can rotate 90 °, therefore, make pedal be parallel to the vertical plane of bicycle.Be screwed into tie bolt 505 in the screw 608.

At Fig. 1, in 2,3 and 7, sprocket wheel before has drawn, have an integral type crank on it, have receiving device on the crank, so that accept to have side's awl attaching parts of axle, these are known in the art, as shown in Figure 7, on the axle 603 screw 606 that can accept tie bolt 505 are arranged.Axle 603 press fit in the inner ring of bearing 605, and above-mentioned sprocket wheel then is connected in the opposite end.

Axle 603 can be solid or hollow, and this depends on the selection of connecting device between left crank branch unit 500 and the preceding sprocket wheel branch unit 600.Three kinds of connecting devices are adopted in suggestion, can bore connecting device and screw connection in the side of setting at the free end of axle 503, and these two kinds of connecting devices match with corresponding receiver devices in the sprocket wheel branch unit 600.These two kinds of connecting devices all require hollow shaft 603, as shown in Figure 9.The third connecting device is the radial teeth connecting device shown in Fig. 6 and 7, preferably uses solid axle this moment.

The preceding sprocket wheel propeller boss branch unit 400 required axial force that is assembled together is provided by sprocket wheel propeller boss tie bolt 505.The size of this power is by the axial width control of spacer ring 509.By encircle 509 with the circumferential contact of the inner ring of bearing 511, ball bearing of main shaft 511 and 605 inner ring are pulled together, ball by bearing again, the outer ring of bearing is pulled in together, chain wheel hub external member 401 and 402 is pulled together then, without the hub adapter sleeve, and just sprocket wheel propeller boss branch unit can be fixed with a bolt, but, also can consider to adopt the hub adapter sleeve.

Shaft assembly is made up of axle 503 and axle 603, only contacts with 605 inner ring with bearing 511, and this is because of the internal diameter of the preceding sprocket wheel propeller boss diameter greater than described Shaft assembly.When bicycle assembling or dismounting, and when tightening or loosening, only can push or pull out propeller boss to left crank branch unit 500 easily by a bolt.Preceding sprocket wheel propeller boss branch unit is made core type by oneself, when engaging, just forward and backward is locked together, thereby makes left crank branch unit insert easily and extract.

By ball bearing of main shaft 605, the bearing seat 412 of the right external member 402 of sprocket wheel propeller boss branch unit can be installed in preceding sprocket wheel branch unit on the cycle frame independently independently before being pressed into.Folding bicycle, when left crank branch unit 500 was pulled down on the sprocket wheel propeller boss branch unit in the past, sprocket wheel branch unit 600 was still stayed on the cycle frame.

The structure of handgrip branch unit 700 makes the handgrip member 701 and 702 fold-downs in right side and left side.By connecting panel 703 and 704 and bolt 705 and 706, handgrip member 701 and 702 is fixed on the handgrip post 707, and the handgrip post is connected in front fork 16 by bolt 708 and head 709 again in the prior art manner known.By the brake lining between handgrip member 701 and 702 710 and 711, and depend on the tightening torque that acts on bolt 705 and 706, it is adjustable that handgrip member 701 and 702 is moved up and down required power.By adjustment handgrip member 701 and 702 is remained on the needed position of mode of operation, just can move up and down the handgrip member as long as apply a very powerful power.Control position on the orientation of exceeding is provided with a retainer.

By above-mentioned frictional connection, when handgrip member 701 and 702 being folded down and propping up upper member 301 and 302 respectively, front fork 16 is no matter related front-wheel 6 whether, all is blocked and can not rotates.

Folding of bicycle:

1. make bicycle be in the normal stand position, front fork 16 and front-wheel 6 rotated backward 180 °, be prevented from rotation-prevention in this position by handgrip branch unit 700, handgrip member 701 and 702 is folded down prop up respectively upper member 301 and 302(3 second).

2. use hex drive tool with Panasonic on preceding 505 the past of sprocket wheel propeller boss tie bolt sprocket wheel branch unit 600, left crank branch unit 500 is pulled out in the sprocket wheel propeller boss branch unit 400 in the past.Intermediate member 417 usefulness fine rules are fixed on the vehicle frame, and pitch but still hang over (15 seconds) on the vehicle frame this moment.

3. after trailing wheel unclamps in the groove 221 and 222 of trailing wheel guide plate 219 and 220 to front slide, touch pivot block 311 until rear tyre.Sprocket wheel is topped now is fixed in 3 points with messenger chain on the wheel face of back, promptly the chain frame 217, preceding sprocket wheel 604 and back sprocket wheel 42.Trailing wheel is fastened on this forward position once more, thereby stablizes after-frame triangle 201 and 202(25 second).

4. pull down front-wheel (30 seconds).

With side arm lower member 303 and 304 to together the extruding, inner member 403 and 404 is thrown off from external member 401 and 402, thereby can make side arm branch unit 300, together with handgrip, vehicle seat and front fork change after-frame branch unit 200 over to around pin axial sleeve 203 together, like this, and along with these two branch units change the other side mutually over to, two side arm lower members 303 and 304 walk between two seat pillars 209 and 210 and two back vent members 213 and 214, and trailing wheel walks between two side arm lower members 303 and 304.Walk to then between two side arm upper members 301 and 302, until reaching final position (45 seconds).So far take 45 seconds altogether.Also can select for use spring 41 to fix messenger chain.

As the improvement of this bicycle, Figure 13 a, 13b a kind of U-shaped axle that draws.U-shaped axle 30 between two seat pillars 209 and 210, and between side arm lower member 303 and 304, can freely rotate in cycle frame between two back vent members 213 and 214.In order to hold the U-shaped axle, removed two backing blocks, inner member 403 and 404, and intermediate member 417, thus with the lower end removable jew of lower member 303 and 304 be individually fixed in external member 401 and 402.By being installed in surface 31 and 32 in the bearing inner ring, with 605 the external member axial restraint is in the same place by bearing 511.Trailing wheel can move forward at 34 of the U-shapeds of U-shaped axle, and will not pull down by axle, and the shank of crank and U-shaped 33 is 90 °, thereby crank is automatically topped on back wheel face.

Improvement shown in Figure 12 is collapsible woman's bicycle, wherein the side arm upper member has been done improvement.Because the leap degree of depth of woman's bicycle is relevant with the geometric configuration of trailing wheel, thereby in order to guarantee the darker leap degree of depth, upper member preferably is installed in the outside of after-frame branch unit (not drawing).The upper end of side arm upper member then need be provided with the attachment point that a transverse member (not drawing) is used as vehicle seat.

Claims (16)

1, a kind of folding type bicycle assembly has:

One side arm branch unit, it comprises a front fork sleeve, two upper members and two lower members, one front fork is housed in front fork sleeve in the prior art manner known, one pivot coupling device is together with the after-frame branch unit, two upper members laterally are spaced from each other and with respect to bicycle vertical plane symmetry, its front end is fixed in the upper end of front fork sleeve, its rearmost end removable jew ground is fixed in described after-frame branch unit, the lower end of front fork sleeve is fixed in the upper end of two lower members, preceding sprocket wheel propeller boss branch unit then is fixed in its lower end, is used as the pivot coupling device with the after-frame branch unit;

The front end of two upper members is fixed on the upper end of front fork sleeve;

It is characterized in that: the rearmost end of two upper members is fixed on the pivot block, is fixing bike saddle on the pivot block, and the lower end of front fork sleeve is fixed in the upper end of two lower members, and the removable jew ground, lower end of two lower members is fixed in preceding sprocket wheel propeller boss branch unit;

One after-frame branch unit, it comprises two triangles, one pin axial sleeve, one pin axial sleeve bolt, an and trailing wheel, above-mentioned two triangle is placed side by side, topmost laterally link together at it, above-mentioned pin axial sleeve is used as the trunnion bearing and the axle of side arm branch unit pivot block, it is axially perpendicular to the vertical plane of bicycle, between the top of above-mentioned two triangle, above-mentioned after-frame tie bolt, pass the axial hole on the pivot block, laterally above-mentioned two triangle being reached the pin axial sleeve that is used as spacer betwixt is fixed together, each triangle, be that right triangle and left triangle are respectively by a seat pillar, one back vent member, one vehicle seat brace, the external member of one a trailing wheel receiving device and a sprocket wheel propeller boss is formed, each seat pillar and back vent member all are fixed on separately the sprocket wheel propeller boss external member, each back vent member and vehicle seat brace all are fixed on separately the trailing wheel receiving device, in each leg-of-mutton the top, each vehicle seat brace all is fixed on separately the seat pillar, above-mentioned trailing wheel is installed between the above-mentioned two triangle, and the axis normal of hind axle is positioned within each triangle in the bicycle vertical plane, every groove of each trailing wheel receiving device also is positioned within each triangle, thereby trailing wheel can move forward between two triangle;

Sprocket wheel propeller boss branch unit before one, it comprises coaxial related parts, the i.e. external member in a left side, the external member on one right side, the inner member in one left side, the inner member on one right side and an intermediate member, at these coaxial related parts places, above-mentioned seat pillar, the lower member of side arm branch unit and back vent member are connected, the inner member in above-mentioned left side is fixed in the lower end of the left side lower member of side arm branch unit, the inner member on above-mentioned right side is fixed in the lower end of the right side lower member of side arm branch unit, above-mentioned intermediate member can be drawn together on an above-mentioned left side, between the right inner member, annular protrusion by the seat in inboard each hole of each external member and each inner member outside of matching with it, and by the seat in inboard each hole of each inner member, the diameter of the intermediate member that is mated, each external member is together with seat pillar and back vent member fixing on it, each inner member coaxially fits together together with the lower member and the intermediate member of side arm branch unit fixing on it, thereby formed stable load connector, yet this joint is assembly and disassembly easily again, and only need very little axial force just preceding sprocket wheel propeller boss branch unit can be fixed together;

During the folding bicycle, trailing wheel moves to anteposition in the after-frame branch unit, then, with side arm branch unit and after-frame branch unit around its public pin axial sleeve axis mutually to changing the other side over to, thereby along with two branch units to changeing, the lower member of side arm branch unit walks between two seat pillars and the two back vent members, trailing wheel then walks between two lower members of side arm branch unit, walk to then between two upper members of side arm branch unit, thereby the inner member under the lower member is approximately walked between the two trailing wheel receiving devices, touch up to trailing wheel till the lower end of front fork sleeve, on this terminal location, substantially equal the radius of trailing wheel from the axis of hind axle to the pivot block axis with to the distance of the axis that passes the trailing wheel receiving device, and equal the trailing wheel radius substantially from the axis of the hind axle distance of the axis of sprocket wheel propeller boss before pass and deduct preceding sprocket radius.

2, folding type bicycle assembly as claimed in claim 1, it is characterized in that: above-mentioned assembly, between leg-of-mutton trailing wheel receiving device of each after-frame and corresponding seat pillar, the trailing wheel guide plate that also has a fluting that is parallel to the bicycle vertical plane, groove on this trailing wheel guide plate is the extendible portion of the groove on the trailing wheel receiving device, when folding or expansion bicycle, hind axle and trailing wheel can move along this groove.

3, folding type bicycle assembly as claimed in claim 2, it is characterized in that: when with the lower member of side arm branch unit and before each corresponding inner member of sprocket wheel propeller boss branch unit when the after-frame branch unit is snapped away from, the trailing wheel guide plate is fixed together together with the two triangle of the trailing wheel that is fixed on anteposition on it with after-frame.

4, folding type bicycle assembly as claimed in claim 1, it is characterized in that: when having the backpedalling brake bar as trailing wheel, above-mentioned assembly also has a sliding sleeve, in the groove of the trailing wheel guide plate on the left of being fixed on, but be installed to rigidly on the restrictor bar, restrictor bar can slide with trailing wheel when trailing wheel moves forward and backward.

5, folding type bicycle assembly as claimed in claim 1, it is characterized in that: described assembly also has the backing block on each external member that is installed on preceding sprocket wheel propeller boss branch unit, semicircle pod is all arranged on each backing block, its radius equals the main radius of each inner member of sprocket wheel propeller boss branch unit, thereby when launching bicycle, just before joint, inner member contacts backing block separately respectively, make side arm branch unit and after-frame branch unit mutually to changeing, further separately, overcome the resistance of the lower member formation of side arm branch unit, the inner member interlock is advanced in the pod of respective stop part, and further force each inner member axially to enter separately external member with respect to an outside prestrain of the inner member of the lower member of side arm branch unit, be rigidly connected thereby between side arm branch unit and after-frame branch unit, set up.

6, folding type bicycle assembly as claimed in claim 1, it is characterized in that: described assembly also has an interior preceding sprocket wheel branch unit of external member that is installed in preceding sprocket wheel propeller boss right side, and interior left crank branch unit of external member that is installed in preceding sprocket wheel propeller boss left side, when these two branch units being linked together by sprocket wheel propeller boss tie bolt, these two branch units axially are fixed together preceding sprocket wheel propeller boss branch unit, described bolt is pulled in the inner ring of left side ball bearing of main shaft inner ring and right side ball bearing of main shaft together by spacer ring on the left crank branch unit and the axle by preceding sprocket wheel branch unit, ball by two bearings is pulled in the outer ring of two bearings together again, thereby the left side of preceding sprocket wheel propeller boss and the external member on right side be pulled in together, because the diameter of axle in the preceding sprocket wheel propeller boss is less than the internal diameter of propeller boss, the tumbler of these two branch units that match only contacts with the inner ring of two ball bearing of main shafts.

7, folding type bicycle assembly as claimed in claim 1, it is characterized in that: described assembly also has a preceding sprocket wheel branch unit, by the ball bearing of main shaft of the described branch unit in the external member on sprocket wheel propeller boss right side before being contained in, preceding sprocket wheel branch unit is fixed on the cycle frame as a rotating unit.

8, folding type bicycle assembly as claimed in claim 1, it is characterized in that: a sprocket wheel branch unit and a left crank branch unit before above-mentioned assembly also has one, connect in order to set up anti-the commentaries on classics, these two branch units are by the radial teeth connecting device or the side bores connecting device or screw connection links together, and by preceding sprocket wheel propeller boss tie bolt, with two branch units the axle axially link together.

9, folding type bicycle assembly as claimed in claim 1, it is characterized in that: sprocket wheel branch unit before above-mentioned assembly also has, its crank is anti-to be fixed on the preceding sprocket wheel branch unit with changeing, unclamp on the sprocket wheel branch unit in the past, when unclamping, by with the hinge arrangement of preceding sprocket wheel branch unit, above-mentioned crank and its pedal can be around 90 ° of rotational that is parallel to the crank major axis, thereby make the principal plane of pedal be parallel to the bicycle vertical plane.

10, folding type bicycle assembly as claimed in claim 1, it is characterized in that, above-mentioned assembly also has the cycle frame of being installed in right side, near the trailing wheel receiving device a chain frame, therefore, when trailing wheel when its anterior folded position moves to its control position, the chain frame remains on the position of " dead work " messenger chain, make messenger chain automatically by the back sprocket engagement, and on control position, the chain frame does not contact with messenger chain.

11, folding type bicycle assembly as claimed in claim 1, it is characterized in that: above-mentioned assembly also has a side arm branch unit, and wherein each upper member and each lower member all have rectangular cross section.

12, folding type bicycle assembly as claimed in claim 1, it is characterized in that: above-mentioned assembly also has a side arm branch unit, wherein two lower members and two upper members are fixed in front fork sleeve by the connecting device that can pivot, and above-mentioned pivotally supported axis normal is in the vertical plane of bicycle.

13, folding type bicycle assembly as claimed in claim 1, it is characterized in that: above-mentioned assembly also has a side arm branch unit, wherein the removable jew ground, upper end of each lower member is fixed in front fork sleeve, and the lower end of each lower member is fixed in the corresponding external member of preceding sprocket wheel propeller boss branch unit in the following manner; When the upper end of lower member when front fork sleeve is taken apart, lower member can be around the rotational that overlaps with preceding sprocket shaft.

14, folding type bicycle assembly as claimed in claim 1, it is characterized in that: above-mentioned assembly also has the handgrip branch unit that is installed on bicycle front fork in the prior art manner known, mobilizable left hand and right hand is firmly held in member on the position of any needs by two braking liners, a left side, the upper and lower mobile required power of right handgrip member can be adjusted, and, will stop the rotation of front fork when handgrip member folding during to the lower position of the corresponding upper member that props up the side arm branch unit.

15, folding type bicycle assembly as claimed in claim 1, it is characterized in that: above-mentioned assembly also has the preceding sprocket shaft of a U-shaped, sprocket shaft has replaced the backing block of preceding sprocket wheel propeller boss branch unit before the above-mentioned U-shaped, an intermediate member and a left side, right inner member, thereby the lower end of each lower member of side arm branch unit then removable jew ground regularly in the corresponding external member of preceding sprocket wheel propeller boss branch unit, each external member then axially is fixed together by being contained in the U-shaped axle in the corresponding bearing inner ring, the U-shaped axle can be freely in cycle frame, at two back vent members, two seat pillars, and freely rotate between two members of side arm branch unit, thereby trailing wheel can move forward between the U-shaped of U-shaped axle, and because the shank of crank and U-shaped is 90 °, thereby when trailing wheel was in its anteposition, crank was automatically topped on the wheel face of back.

16, folding type bicycle assembly as claimed in claim 1, it is characterized in that: above-mentioned assembly does not have a side arm branch unit, wherein upper member extends downwards backward from the upper end of front fork sleeve, yet extend upward backward again, engage with pivot block, thereby form a side arm branch unit that is applicable to lady's bicycle.

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