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A foldable bicycle includes a foldable bicycle frame which comprises a main frame and an enclosing frame foldably to define a receiving cavity; a front and a rear wheel assembly rotatably supported by the bicycle frame; a bicycle driving unit operatively mounted on the bicycle frame and connected to

A foldable bicycle includes a foldable bicycle frame which comprises a main frame and an enclosing frame foldably to define a receiving cavity; a front and a rear wheel assembly rotatably supported by the bicycle frame; a bicycle driving unit operatively mounted on the bicycle frame and connected to the two wheel assemblies for driving at least one of the wheel assemblies rotating; a steering unit longitudinally extended from the front wheel assembly for steering a moving direction of the front wheel assembly; and a folding arrangement. The folding arrangement includes a folding link connecting the front and the rear wheel assembly, the bicycle driving unit, the steering unit, the enclosing frame, and the main frame in a foldable manner; and a folding actuator operatively connected with the folding link in such a manner that the foldable bicycle is adapted to move between a folded position and an unfolded position.

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What is claimed is: 1. A foldable bicycle, comprising: a foldable bicycle frame which comprises a main frame and an enclosing frame foldably connected thereto to define a receiving cavity within said main frame and said enclosing frame; a wheel assembly comprising a front and a rear wheel assembly

What is claimed is: 1. A foldable bicycle, comprising: a foldable bicycle frame which comprises a main frame and an enclosing frame foldably connected thereto to define a receiving cavity within said main frame and said enclosing frame; a wheel assembly comprising a front and a rear wheel assembly rotatably supported by said bicycle frame; a driving unit operatively mounted on said bicycle frame and connected to said wheel assembly for rotatably driving said bicycle frame to move; a steering unit which is supported by said bicycle frame, and is longitudinally extended from said front wheel assembly for steering a moving direction of said front wheel assembly; and a folding arrangement; which comprises: a folding link connecting said front and said rear wheel assembly, said bicycle driving unit, said steering unit, said enclosing frame, and said main frame in a foldably movable manner; and a folding actuator operatively mounted on said bicycle frame and connected with said folding link in such a manner that said foldable bicycle is adapted to move between a folded position that said enclosing frame is pivotally moved to enclose said main frame, wherein said front and said rear wheel assembly, said bicycle driving unit and said steering unit are driven by said folding link to foldably receive into said receiving cavity, and an unfolded position that said enclosing frame, said front and said rear wheel assembly, said bicycle driving unit and said steering unit are unfolded from said receiving cavity to extend on said bicycle frame for normal operation. 2. The foldable bicycle, as recited in claim 1, wherein said fold actuator comprises a fold actuation member mounted on said main frame, a fold supporting member, a first transmission pulley and a first operation gear coaxially mounted with said fold actuation member via a main axle, a second operation gear engaging with said first operation gear, and a second transmission pulley coaxially mounted with said second operation gear via a secondary axle on said fold supporting member, in such a manner that said fold actuation member is adapted to drive said first transmission pulley and said first operation gear to rotatably move with respect to said bicycle frame about said main axle, which in turn drive said second operation gear and said second transmission pulley to rotatably move about said secondary axle. 3. The foldable bicycle, as recited in claim 2, wherein said folding link comprises a primary folding link which is linked with said first transmission pulley, and a secondary folding link which is linked with said second transmission pulley, wherein said fold actuation member is adapted to rotatably drive said first and then said second transmission pulley to rotate so as to actuate said first and said secondary folding link to fold said foldable bicycle into said folded position. 4. The foldable bicycle, as recited in claim 3, wherein said first operation gear has a plurality of engaging teeth formed peripherally thereon, and said second operation gear also has a plurality of engaging teeth formed peripherally on a half of a circumference of said second operation gear to define an effective driven distance which is adapted to be driven to rotate by said first operation gear. 5. The foldable bicycle, as recited in claim 4, wherein said foldable arrangement further comprises an auxiliary fold triggering device operatively provided on said foldable bicycle wherein said auxiliary fold triggering device comprises a steering unit trigger, a front wheel trigger, a driving unit trigger, and an enclosing cover trigger which are linked to secondary transmission pulley via said secondary folding link, for facilitating and coordinating a folding operation of said foldable bicycle. 6. The foldable bicycle, as recited in claim 5, wherein said primary folding link comprises a steering folding link, a driving folding link and an enclosing cover folding link which are extended to link said the steering unit, said wheel assembly, said driving unit, and said rear enclosing frame respectively from said first transmission pulley, in such a manner that when said first transmission pulley is driven to rotate, said primary folding link is actuated to drive said steering folding link, said driving folding link and said enclosing cover folding link to fold said steering unit, said driving unit and said enclosing cover respectively into said folded position of said foldable bicycle. 7. The foldable bicycle, as recited in claim 6, wherein said secondary folding link comprises a steering handle trigger link, a steering member trigger link, a driving trigger link, an enclosing cover trigger link, and a front wheel trigger link which are extended to link with said steering unit trigger, said driving unit trigger, said enclosing cover trigger, and said front wheel trigger respectively from said secondary transmission pulley. 8. The foldable bicycle, as recited in claim 7, wherein said steering unit comprises an elongated steering member and two steering handles transversely extended from two sides of said steering member, wherein each of said steering handles comprises a conveying gear having a locking latch outwardly protruded therefrom, and a turning gear engaging with said conveying gear wherein said steering handles are adapted to be pivotally folded towards said steering member in such a manner that said steering handles and said steering member are capable of passing through said folding slot of said front enclosing cover. 9. The foldable bicycle, as recited in claim 8, further comprising a braking system which comprises a front and a rear brake operatively communicated with said front and said rear wheel assemblies, and a brake actuation arrangement which comprises two brake actuation rotors disposed in said two steering handles respectively, two rotor ridges protruded from an inner surface of each said steering handles respectively wherein said respective brake actuation rotor is arranged to be engaged with said respective rotor ridge in a longitudinally movable manner, and two brake cables extended from two inner ends of said brake actuation rotors respectively through said respective conveying gear to said front and said rear brakes in such a manner that when said brake actuation rotors are longitudinally moved to pull said braking cables, said front and said rear brakes are actuated to exert a braking force to said front and said rear wheel assembly respectively. 10. The foldable bicycle, as recited in claim 9, wherein said steering unit trigger comprises two steering handle triggers axially mounted with said two conveying gears respectively, wherein each of said steering handle triggers comprises a circular trigger rotor having a link slot indently and peripherally formed thereon for mounting with said steering handle trigger link, and a steer stopper penetrably mounted on said conveying gear and said circular trigger rotor in a resiliently movable manner for controlling a lateral rotational movement of said conveying gear and said circular trigger rotor, wherein said circular trigger rotor further has a first engaging slot, defining an first inclined sidewall in a first pusher end thereof, formed thereon, and said conveying gear has a first insertion slot, defining a first inclined boundary wall, formed thereon which is substantially aligned with said first engaging slot. 11. The foldable bicycle, as recited in claim 10, wherein said first steering stopper comprises a first main body, a first resilient member mounted in said first main body, and a first stopper head adapted to be slidably pushed to normally extend from said first main body by said first resilient member between a locked position and an unlocked position, wherein in said locked position, said first stopper head is fully extended to penetrate through said first insertion slot to said first pusher end of said first engaging slot wherein said first locking latch is inserted into another end of said first engaging slot, in such a manner that a lateral movement between said circular trigger rotor and said conveying gear is substantially blocked, wherein in said unlocked position, said first stopper head is retracted from said first engaging slot by rotating said circular trigger rotor in such a manner that the said inclined sidewall of said first engaging slot is adapted to rearwardly push said first stopper head disengaging with said first engaging slot and received in said first insertion slot of said conveying gear. 12. The foldable bicycle, as recited in claim 11, wherein said enclosing frame further comprises an enclosing cover movably communicated with said enclosing cover trigger which is mounted on said driving unit via two rear connecting rods in such a manner that said rear enclosing cover is adapted to be pivotally driven to move by said folding arrangement. 13. The foldable bicycle, as recited in claim 12, wherein said enclosing cover trigger comprises a trigger supporting frame mounted on said driving unit, a main trigger gear rotatably mounted in said trigger supporting frame, an cover trigger rotor, having a rotor slot indently and peripherally formed thereon for mounting with said enclosing cover trigger link, coaxially mounted with said main trigger gear, a rear cover rotary gear engaging with said main trigger gear so as to be driven thereby, and a second steering stopper penetrably mounted on said main trigger gear and said cover trigger rotor for controlling a lateral rotational movement of said main trigger gear and said cover trigger rotor. 14. The foldable bicycle, as recited in claim 13, wherein said main trigger gear further has a second locking latch outwardly protruded therefrom for inserting into said second engaging slot of said cover trigger rotor, wherein said second steering stopper comprises a second main body, a second resilient member mounted in said second main body, and a second stopper head adapted to be slidably pushed to normally extend from said second main body between the restricted position and the idle position, wherein in said restricted position, said second stopper head is fully extended from said second main body to penetrate through said second insertion slot to said second pusher end of said second engaging slot wherein said second locking latch is inserted into another end of said second engaging slot, in such a manner that a lateral movement between said cover trigger rotor and said main trigger gear is substantially blocked, wherein in said idle position, said second stopper head is retracted from said second engaging slot by rotating said cover trigger rotor in such a manner that said second inclined sidewall of said second engaging slot is adapted to rearwardly push said second stopper head disengaging with said second engaging slot and received in said second insertion slot of said main trigger gear. 15. The foldable bicycle, as recited in claim 14, wherein said front wheel assembly comprises a front wheel holder, a front wheel rotatably mounted thereon, and a wheel folding hinge movably connecting said front wheel holder and said elongated steering member, wherein said wheel folding hinge has a first operation groove indently formed on a top surface thereof for connecting with said a bottom connecting portion of said elongated steering member in a pivotally movable manner and two first aligned receiving slots indently and transversely formed on two sidewalls of said first operation groove and communicated with said first trigger slot of said elongated steering member. 16. The foldable bicycle, as recited in claim 15, wherein said steering unit trigger further comprises a steering member trigger which is mounted in said first trigger slot of said elongated steering member and said wheel folding hinge, wherein said steering member trigger comprises a first steering trigger rotor, having two first locking indents formed on two sides thereof respectively, rotatably mounted in said first trigger slot and operatively linked with said steering member trigger link which is then extended to said fold actuator, two pusher balls movably received in said two receiving slots of said wheel folding hinge respectively, and two first pusher elements mounted in said two receiving slots for normally applying an inward urging force to said respective first pusher balls within said respective receiving slot, in such a manner that said two first pusher balls are normally pushed to bias against two sides of said first steering trigger rotor so that a rotational movement of said elongated steering member with respect to said front wheel assembly is substantially restricted by said two first pusher balls. 17. The foldable bicycle, as recited in claim 16, wherein said front wheel holder further has a second operation groove indently formed on a top surface thereof for connecting with a bottom coupling portion of said wheel folding hinge in a pivotally movable manner, and two second aligned receiving slots indently and transversely formed on two sidewalls of said second operation groove and communicated with said second trigger slot of said wheel folding hinge, wherein said bottom coupling portion of said wheel folding hinge has a second trigger slot formed therein for mounting said front wheel trigger. 18. The foldable bicycle, as recited in claim 17, wherein said front wheel trigger comprises a second steering trigger rotor, having two second locking indents formed on two sides thereof respectively, rotatably mounted in said second trigger slot and operatively linked with said front wheel folding link, two second pusher balls movably received in said two second receiving slots of said front wheel holder respectively, and two second pusher elements mounted in said two second receiving slots for normally applying an inward urging force to said respective second pusher balls within said respective second receiving slot, in such a manner that said two second pusher balls are normally pushed to bias against said two sides of said second steering trigger rotor so that a rotational movement of said wheel folding hinge with respect to said front wheel holder is substantially restricted by said two second pusher balls. 19. The foldable bicycle, as recited in claim 18, wherein said transmission member of said driving unit comprises a front sustaining member and a rear sustaining member foldably connected with said front sustaining member via said securing device, which comprises an upper fold guider comprising a first guider housing having a first slanted surface, and a first resilient axle longitudinally extended from said first slanted surface, wherein said rear sustaining member has a bottom linkage portion having a first inclined surface downwardly extended towards said securing device and is arranged to correspond and align with said first slanted surface of said upper fold guider. 20. The foldable bicycle, as recited in claim 19, wherein said securing device further comprises a lower fold guider comprising a second guider housing having a second slanted surface, and a second resilient axle longitudinally extended from said second slanted surface, wherein said rear wheel assembly comprises a rear wheel holder having an upper linkage portion which has a second inclined surface upwardly extended towards said securing device and is arranged to correspond and align with said second slanted surface of said lower fold guider. 21. The foldable bicycle, as recited in claim 20, wherein said driving unit trigger comprises a first and a second supporting gear mounted in said securing device wherein said driving trigger link comprises a first drive trigger link and a second drive trigger link movably engaged on said first and said second supporting gears which are arranged to be driven to rotate by a respective pulling force applied on said first and said second drive trigger link by said auxiliary fold actuator. 22. The foldable bicycle, as recited in claim 21, wherein said driving unit trigger further comprises a first and a second blocking member engaged with said first and said second supporting gears respectively, wherein said first and said second blocking member are extended out of said securing device to communicate with said upper linkage portion of said rear sustaining member and said bottom linkage portion of said front sustaining member respectively in such a manner that said first and said second blocking member are adapted to normally block a pivotal movement of said front sustaining member and said rear sustaining member about said first and said second resilient axle respectively. 23. The foldable bicycle, as recited in claim 21, wherein when said front sustaining member and said rear sustaining member are being folded, said front sustaining member and said second sustaining member are substantially guided by said first and said second slanted surfaces respectively in such a manner that said front sustaining member and said rear sustaining member are arranged to opposedly and transversely displace by a predetermined distance so as to disalign with each other for foldably receiving in said transmission member main frame. 24. The foldable bicycle, as recited in claim 23, wherein said driving unit further comprises an elongated slider mounted on said driving axle wherein said dynamic gear is adapted to slidably move along said elongated slider when said second sustaining member is folded to be transversely displaced as guided by said second slanted surface. 25. The foldable bicycle, as recited in claim 24, wherein said driving unit trigger further comprises a first and a second resilient springs mounted in said securing device and adapted to normally apply an urging force to said first and said second blocking members so as to normally push said blocking member extending out of said securing device for blocking said pivotal movement of said front and said rear sustaining member respectively, in such a manner that when said first and said second drive trigger link are relieved, said first and said second resilient springs are adapted to outwardly push said first and said second blocking member so as to block said pivotal movement of said front and said rear sustaining member.