Folding bicycle

Abstract

The present invention provides a folding bicycle. The folding bicycle comprises a folding bicycle frame; the folding bicycle frame comprises a main beam, a seat post body, and a rear fork; the main beam is connected to the seat post body by means of a first folding mechanism; the rear fork is provided with a pedal bottom bracket hole; the rear fork is connected to the seat post body; the pedal bottom bracket hole is located in front of the seat post body. The present invention solves the problem in the prior art of how to make the size of the folding bicycle smaller after folding.

Description

A folding bicycle Technical Field

[0001] The present invention relates to the technical field of folding bicycles, and in particular to a folding bicycle. Background Art

[0002] The existing folding vehicles (including but not limited to folding bicycles and folding electric vehicles) are still relatively large in size after folding, making them inconvenient to store and carry.

[0003] Therefore, how to further reduce the size of the folding bicycle after folding becomes a technical problem that needs to be solved.

[0004] Summary of the Invention

[0005] The object of the present invention is to provide a folding bicycle, which mainly solves the problem existing in the prior art of how to further reduce the size of the folding bicycle after folding.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is a folding bicycle, characterized in that: the folding bicycle includes a folding frame, the folding frame includes a main beam, a seat tube body and a rear flat fork, the main beam and the seat tube body are connected by a first folding mechanism, the rear flat fork is provided with a pedal center axis hole, the rear flat fork is connected to the seat tube body, and the pedal center axis hole is located in front of the seat tube body.

[0007] Furthermore, the rear fork is connected to the seat tube body via a first connecting shaft;

[0008] And / or a shock absorbing mechanism is provided between the front end of the rear flat fork and the seat tube body;

[0009] And / or the main beam is provided with a curved portion.

[0010] Furthermore, a shock absorbing mechanism is provided between the top of the front end of the rear fork and the seat tube body;

[0011] And / or a shock absorbing mechanism is provided between the bottom of the front end of the rear flat fork and the seat tube body.

[0012] Furthermore, the shock absorbing mechanism includes an elastic member, and the portion where the seat tube body is connected to the first folding mechanism is a first connecting portion, the first connecting portion is located above the front end of the rear fork, and both ends of the elastic member are respectively connected to the top of the front end of the rear fork and the first connecting portion of the seat tube body;

[0013] And / or a first extension portion extending forward is provided on the seat tube body at a position below the front end of the rear flat fork, and both ends of the elastic member are respectively connected to the bottom of the front end of the rear flat fork and the first extension portion of the seat tube body.

[0014] Furthermore, the rear end of the main beam is connected to the first folding mechanism, the portion of the main beam close to the first folding mechanism is the rear beam portion, the portion of the main beam close to the front end of the main beam is the front beam portion, the connection between the rear beam portion and the front beam portion forms a curved portion, and the space below the curved portion is used to accommodate the folded front wheel;

[0015] The angle between the rear beam and the horizontal plane is greater than the angle between the front beam and the horizontal plane; or the rear beam forms an angle with the horizontal plane and the front beam is horizontally arranged; or the rear beam forms an angle with the horizontal plane and the front beam is slightly inclined.

[0016] Furthermore, the rear fork is further provided with an intermediate gear shaft hole for connecting with the intermediate gear shaft, and the pedal shaft hole and the intermediate gear shaft hole are respectively located on both sides of the first connecting shaft;

[0017] and / or the distance between the front end of the rear fork and the axis of the first connecting shaft is one third to one quarter of the length of the rear fork;

[0018] and / or the front end of the main beam is connected to the head pipe, and the front end of the head pipe is provided with a headlight;

[0019] and / or the inner area of ​​the intermediate gear shaft hole is larger than the cross-sectional area of ​​the intermediate gear shaft;

[0020] and / or the distance between the front end of the rear fork and the axis of the first connecting shaft is less than or equal to the distance between the first folding mechanism and the axis of the seat tube body;

[0021] and / or the rear fork includes a left arm and a right arm, the front ends of the left arm and the right arm are connected by a crossbeam, the left arm, the right arm and the crossbeam are integrally formed, or the three are connected by screws, or the three are welded, the pedal axle hole passes through the crossbeam, and an intermediate gear shaft hole is provided on the left arm or the right arm; the left arm and the right arm are connected to the seat tube body by a first connecting shaft;

[0022] And / or the elastic member is a spring or a tendon; or the elastic member is a spring and a tendon, and the tendon is nested inside the spring.

[0023] A folding bicycle, characterized in that: the folding bicycle further includes a second connecting mechanism for the front fork and the upright, the second connecting mechanism including a second connecting member for connecting to the upright, a steering shaft for connecting to the front fork, and a tightening member, the second connecting member and the steering shaft being threadedly connected;

[0024] The second connecting member is provided with a first mounting hole, and the steering shaft is provided with a positioning groove;

[0025] One end of the pressing member passes through the first mounting hole and is embedded in the positioning groove, thereby fixing the relative positions of the second connecting member and the steering shaft.

[0026] Furthermore, the connection mechanism further comprises a first limiting bolt, and the outer side surface of the first limiting bolt is provided with a third external thread;

[0027] A first connecting groove is provided at one end of the steering shaft, a first internal thread is provided on the inner side wall of the first connecting groove, and a first external thread is provided on the outer side of the steering shaft end, and the directions of the first internal thread and the first external thread are opposite;

[0028] The second connecting member is provided with a second connecting groove, the second connecting groove is provided with a second internal thread, one end of the steering shaft is embedded in the second connecting groove, and the second internal thread matches the first external thread;

[0029] The first limiting bolt is embedded in the first connecting groove, and the third external thread matches the first internal thread;

[0030] After the second connecting member, the steering shaft and the first limiting bolt are installed, the head of the first limiting bolt abuts against the end surface of one end of the second connecting member.

[0031] Furthermore, the positioning groove is an axially long strip positioning groove, which is provided on the outer side surface of the steering shaft;

[0032] and / or the second connecting groove is a countersunk hole, and the countersunk hole of the countersunk hole is used to sink the head of the first limiting bolt;

[0033] And / or a bearing steel bowl is mounted on the steering shaft, a gap is provided between the bearing steel bowl and the second connecting member, and an elastic member is provided in the gap;

[0034] Furthermore, the thread depth of the first internal thread is greater than the thread depth of the third external thread;

[0035] The thread depth of the third external thread is greater than the thread depth of the first external thread, and the thread depth of the second internal thread is less than the thread depth of the third external thread;

[0036] The thread depth of the second internal thread is greater than the thread depth of the first external thread.

[0037] Furthermore, the first internal thread is a reverse thread, the first external thread is a forward thread, the third external thread is a reverse thread, and the second internal thread is a forward thread; or the first internal thread is a forward thread, the first external thread is a reverse thread, the third external thread is a forward thread, and the second internal thread is a reverse thread;

[0038] and / or the tightening member is threadedly connected to the first mounting hole, and one end of the tightening member is inserted into the positioning groove and tightens the steering shaft;

[0039] And / or the elastic member is a wave washer; and / or a retaining ring is further provided above the bearing steel bowl, and the retaining ring and the bearing steel bowl are both located below the elastic member.

[0040] and / or the first internal thread and the first external thread are located on the steering shaft at corresponding positions inside and outside;

[0041] And / or the second connecting member and the upright pole are foldably connected via a connecting shaft

[0042] And / or the folding bicycle further comprises a foldable handle.

[0043] Furthermore, the folding bicycle further comprises a second folding mechanism for the front fork and the upright, the second folding mechanism comprising a third connecting member for connecting the upright and the front fork, the third connecting member and the front fork being connected via a third connecting shaft;

[0044] The third connecting member is provided with a rotatable first locking member, the first locking member is provided with a first protrusion, the front fork is connected to the hook through the fourth connecting shaft, the hook is provided with a slot, the first protrusion and the slot cooperate to achieve a locked state or an unlocked state between the first locking member and the hook.

[0045] Furthermore, the first locking member is further provided with a second protruding portion, and the second protruding portion is provided with a second limiting member for limiting the position of the hook in the locked state;

[0046] and / or the front fork is provided with a fourth mounting hole, the fourth connecting shaft is located in the fourth mounting hole; the fourth mounting hole is a strip-shaped hole, a second elastic portion is provided at the inner bottom of the fourth mounting hole, the top of the second elastic portion is connected to the fourth connecting shaft, a fifth mounting hole is provided at the top of the front fork, the fifth mounting hole is connected to the fourth mounting hole, the first limiting member is connected to the fifth mounting hole, the first limiting member and the second elastic portion jointly act on the fourth connecting shaft to adjust the position of the fourth connecting shaft in the fourth mounting hole;

[0047] Furthermore, the first locking member is an L-shaped locking wrench, which includes a first arm and a second arm at right angles, the first arm being rotatably connected to the third connecting member, the first protrusion and the second protrusion being provided on the first arm, the first protrusion being oriented in the same direction as the second limiting member, and the top end of the second limiting member being higher than the top end of the first protrusion;

[0048] The hook is provided with a hollow portion, the top of the hollow portion corresponds to the cross bar of the hook, and the slot is provided at the bottom of the cross bar. The second protrusion and the second limiting member are driven by the first arm to flip in the hollow portion, so that the second limiting member limits the cross bar of the hook in the locked state.

[0049] The second arm is provided with a second positioning pin, and the third connecting member is provided with a third positioning hole. The second positioning pin matches the third positioning hole, thereby realizing a detachable connection between the second arm of the locking wrench and the third connecting member.

[0050] And / or a second mounting hole is provided on the second protruding portion, the second limiting member is a second limiting bolt, and the second limiting bolt is threadedly connected to the second mounting hole.

[0051] Furthermore, a fourth positioning hole is provided on the rear side of the front fork, and a second positioning hole is provided on the rear side of the third connecting member. After the front fork is folded, the second positioning hole and the fourth positioning hole are connected by a first positioning pin.

[0052] And / or the front fork is further provided with a first elastic portion for tightening the hook;

[0053] And / or the top of the first protrusion is an outward convex arc surface; and / or an elastic pad is provided in the slot, and the bottom of the elastic pad is an inward concave arc surface;

[0054] And / or the upright pole and the third connecting member are connected via the front wheel.

[0055] Furthermore, the folding bicycle also includes a first connecting member for the folding frame, which is characterized in that one end of the first connecting member is provided with a tenon for embedding into one end of the main beam.

[0056] Furthermore, the outer side wall of the tenon is provided with a groove for filling with adhesive;

[0057] And / or the outer side wall of the tenon is further provided with a second mounting hole, the main beam is provided with a first mounting hole, and the second mounting hole and the first mounting hole are connected by bolts to realize the connection between the tenon and the main beam;

[0058] And / or a second step portion is provided at the bottom of the tenon, and the second step portion is welded to the end portion of one end of the main beam;

[0059] Furthermore, the main beam is hollow or a second mounting groove is provided at one end of the main beam, and the tenon at one end of the first connecting member is embedded in the one end of the main beam or embedded in the second mounting groove at one end of the main beam, thereby connecting the first connecting member to the main beam; the other end of the first connecting member is hinged to the seat tube body; the other end of the first connecting member is further provided with a locking hole, and the seat tube body is provided with a second locking member, which matches the locking hole, thereby connecting and fixing the seat tube body and the first connecting member when the folding mechanism is in the unfolded state;

[0060] and / or the shape of the tenon matches the inner shape of one end of the main beam or the inner shape of the second mounting groove of the main beam;

[0061] And / or a circle of grooves is provided on the outer side wall of the tenon, and the grooves are connected to the second mounting hole;

[0062] Either the main beam is hollow or a third mounting groove is provided at the other end of the main beam, and the tenon at one end of the first connecting member is embedded in the other end of the main beam or embedded in the third mounting groove at one end of the main beam to realize the connection between the first connecting member and the main beam, and the other end of the first connecting member is connected to the steering shaft, and the steering shaft is connected to the vertical pole.

[0063] Furthermore, the folding bicycle further comprises a folding mechanism for the crank and the pedal axle, a positioning portion is further provided at one end of the crank, the fifth connecting member is provided with a fifth positioning hole or a fifth positioning groove, and the positioning portion matches the fifth positioning hole or the fifth positioning groove;

[0064] Or one end of the crank is further provided with a fifth positioning hole or a fifth positioning groove, and the fifth connecting piece is provided with a positioning portion, which matches the fifth positioning hole or the fifth positioning groove.

[0065] Furthermore, the fifth connecting member is provided with a third protrusion, the third protrusion is provided with a ninth mounting hole, one end of the crank is provided with two fourth protrusions, the fourth protrusion is provided with a tenth mounting hole, when the third protrusion is embedded in the inner recess between the two fourth protrusions, the two tenth mounting holes and the ninth mounting hole are connected by a fifth connecting shaft, the front and rear side surfaces of the fourth protrusion are respectively provided with a positioning portion, and the fifth connecting member on both sides of the third protrusion is respectively provided with a fifth positioning hole;

[0066] The fifth positioning hole is located in the fifth inner recess of the fifth connecting member. The cross section of the fifth inner recess is arc-shaped. The cross sections of the tops of the two fourth protrusions are also arc-shaped. The two fourth protrusions are respectively matched with the corresponding fifth inner recess.

[0067] The other end of the crank is connected to the sixth connecting member, and the sixth connecting member is connected to the pedal through a sixth connecting shaft.

[0068] Furthermore, the fifth connecting member is provided with two fifth protrusions, the fifth protrusion is provided with an eleventh mounting hole and a fifth positioning hole, a sixth protrusion is provided at one end of the crank, the sixth protrusion is provided with a twelfth mounting hole, two positioning portions are provided on each side surface of the sixth protrusion, the two positioning portions on the same side surface are located on both sides of the twelfth mounting hole, and when the sixth protrusion is embedded in the inner recess between the two fifth protrusions, the two eleventh mounting holes and the twelfth mounting hole are connected by the fifth connecting shaft;

[0069] The fifth positioning hole is located below the eleventh mounting hole;

[0070] The cross-section of the top of the fifth protrusion is arc-shaped, and two sixth concave portions are provided on the end surface of one end of the crank. The cross-section of the sixth concave portions is arc-shaped, and the two sixth concave portions are respectively located on both sides of the sixth protrusion, and the two sixth concave portions respectively match the corresponding fifth protrusions;

[0071] The other end of the crank is connected to the sixth connecting member, and the sixth connecting member is connected to the pedal through a sixth connecting shaft.

[0072] The fifth connecting member is provided with a fifth extension portion, the fifth extension portion is provided with a seventh positioning portion, the seventh positioning portion is provided with a seventh protrusion, the seventh protrusion and the fifth extension portion form a seventh slot, the crank is provided with a seventh positioning hole or a seventh positioning slot, and a movable seventh positioning pin. When the crank is unfolded, the seventh positioning portion is embedded in the seventh positioning hole or the seventh positioning slot, and one end of the seventh positioning pin matches the seventh slot.

[0073] Furthermore, a hollow channel is provided in the crank, and the seventh positioning pin moves in the hollow channel. A seventh elastic portion is also provided in the hollow channel corresponding to the other end of the seventh positioning pin; a through hole communicating with the hollow channel is provided on the crank, and the push rod passes through the through hole and connects to the seventh positioning pin;

[0074] A protruding step portion is provided on the fifth extension portion near the seventh positioning portion, and the shape of the protruding step portion matches the shape of the seventh positioning hole or the seventh positioning groove; an inclined surface is provided on one side of one end of the seventh positioning pin corresponding to the protruding step portion;

[0075] and / or a magnetic positioning portion is further provided on the crank; the fifth connecting member is connected to the pedal center axis via a fixing bolt, and the distance between the magnetic positioning portion and the fifth connecting axis is equal to the distance between the fixing bolt and the fifth connecting axis;

[0076] And / or the fifth extension is made of metal.

[0077] In view of the above technical features, the present invention has the following beneficial effects:

[0078] 1. A folding bicycle of the present invention shortens the overall length of the folding bicycle by arranging the pedal center axis hole of the rear flat fork in front of the seat tube body. In this way, when the folding bicycle is folded using the first folding mechanism, the overall size of the folding bicycle will be reduced.

[0079] 2. A folding bicycle of the present invention is provided with a second folding mechanism for the front fork and the upright, so that the front fork and the upright (or the steering shaft) can be folded, thereby facilitating the folding and storage of the front wheel under the frame, thereby further reducing the size of the folded bicycle.

[0080] 3. The folding bicycle of the present invention improves the connection strength between the front fork and the upright by providing a second connecting mechanism between the front fork and the upright, thereby improving the safety of the folding bicycle.

[0081] 4. The folding bicycle of the present invention has a folding pedal mechanism. When the folding bicycle is folded, the pedals can also adjust their directions and fold inward as much as possible, so that the size of the folded bicycle can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] FIG1 is a structural schematic diagram 1 of a folding frame in a specific embodiment 1;

[0083] FIG2 is a structural schematic diagram 2 of a folding frame in specific embodiment 1;

[0084] FIG3 is a structural diagram 3 of a folding frame in specific embodiment 1;

[0085] FIG4 is a schematic structural diagram of the shock absorbing mechanism in specific embodiment 1;

[0086] FIG5 is a schematic structural diagram of a folding bicycle including a folding frame in specific embodiment 1 (in unfolded state);

[0087] FIG6 is a partial enlarged view of FIG5 (including the rear flat fork, showing the double chain drive design);

[0088] FIG7 is a partial enlarged view of FIG5 (excluding the rear flat fork, showing the double chain drive design);

[0089] FIG8 is a schematic structural diagram of a folding bicycle including a folding frame in specific embodiment 1 (folded state, front view);

[0090] FIG9 is a schematic structural diagram of a folding bicycle including a folding frame in specific embodiment 1 (folded state, top view);

[0091] 10 is a schematic structural diagram of a second connecting mechanism for a front fork and a vertical rod in a specific embodiment 7;

[0092] 11 is a cross-sectional view of a second connecting mechanism for a front fork and a stem in a specific embodiment 7;

[0093] 12 is a schematic structural diagram of a second connecting mechanism for a front fork and a vertical rod in a specific embodiment 7 (connecting the vertical rod and the front fork);

[0094] 13 is a schematic structural diagram of the steering shaft in specific embodiment 7;

[0095] FIG14 is a schematic structural diagram of the second connecting block in specific embodiment 7;

[0096] 15 is a schematic structural diagram of the limiting bolt in specific embodiment 8;

[0097] FIG16 is a schematic structural diagram of the retaining ring in specific embodiment 10;

[0098] FIG8 is a schematic structural diagram of a bearing steel bowl in a specific embodiment 10;

[0099] FIG9 is a schematic structural diagram of a second connecting mechanism for a front fork and a stem in a specific embodiment 10 (including a wave washer);

[0100] FIG19 is a schematic structural diagram of the corrugated washer in specific embodiment 10. FIG.

[0101] 20 is a schematic structural diagram of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 20 (in an unfolded state, connecting the front wheel and the vertical rod);

[0102] FIG21 is a structural diagram of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 (in an unfolded state, connecting the front wheel and the vertical rod);

[0103] FIG22 is a structural diagram of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 (in an unfolded state, connecting the front wheel and the vertical rod);

[0104] FIG23 is a structural diagram 23 (in unfolded state) of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11;

[0105] FIG24 is a structural diagram 24 (in unfolded state) of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11;

[0106] FIG25 is a schematic structural diagram of the third connecting member in specific embodiment 11;

[0107] FIG26 is a schematic structural diagram of a hook in specific embodiment 11;

[0108] FIG27 is a schematic structural diagram of the second position-limiting member in specific embodiment 11;

[0109] FIG28 is a schematic structural diagram of the hook and the second limiting member before separation after the second limiting member is flipped in specific embodiment 12;

[0110] FIG29 is a structural diagram 27 of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 (in an unfolded state, the front fork and the vertical rod are connected by a steering shaft);

[0111] 30 is a schematic structural diagram 25 (folded state) of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 14;

[0112] FIG31 is a structural diagram 26 (folded state) of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 15;

[0113] 32 is a schematic structural diagram of the folding bicycle (folded state) including a second folding mechanism for the front fork and the uprights in specific embodiment 15;

[0114] FIG33 is a schematic structural diagram of the front fork in specific embodiment 13 (a second elastic portion is provided in the fourth mounting hole);

[0115] FIG34 is a perspective view of a connector for a folding frame in Example 17;

[0116] FIG35 is a perspective view of a connector for a folding frame in Example 17;

[0117] FIG36 is a perspective view of a connector for a folding frame in Example 17;

[0118] FIG37 is a structural diagram 34 of a first folding mechanism for a folding vehicle in Example 18 (the seat tube body and the main beam are connected, and the first folding mechanism is in a folded state);

[0119] FIG38 is a structural schematic diagram 35 of a first folding mechanism for a folding vehicle in Example 18 (the seat tube body and the main beam are connected, and the first folding mechanism is in a folded state);

[0120] Figure 39 is a schematic structural diagram of the main beam of the folding frame in Example 18;

[0121] FIG40 is a schematic structural diagram of a first folding mechanism for a folding vehicle in Example 18 (the seat tube body and the main beam are connected, and the first folding mechanism is in an unfolded state);

[0122] Figure 41 is a structural schematic diagram of a connection mechanism (steering shaft and main beam connection) for a folding bicycle frame and uprights in Example 19.

[0123] FIG42 is a top view of the connecting member in Example 19;

[0124] FIG43 is a bottom view of the connecting member in Example 19;

[0125] FIG44 is a perspective view 1 of the fifth connecting member in specific embodiment 20;

[0126] FIG45 is a perspective view 2 of the fifth connecting member in specific embodiment 20;

[0127] FIG46 is a perspective view 1 of the crank in specific embodiment 20;

[0128] FIG47 is a perspective view 2 of the crank in specific embodiment 20;

[0129] FIG48 is a schematic structural diagram of a footrest folding mechanism in specific embodiment 21 (folded state);

[0130] FIG49 is a schematic structural diagram of a footrest folding mechanism in specific embodiment 21 (in unfolded state);

[0131] FIG50 is a perspective view 1 of the fifth connecting member in specific embodiment 22;

[0132] FIG51 is a perspective view 2 of the fifth connecting member in specific embodiment 22;

[0133] FIG52 is a perspective view 1 of the crank in specific embodiment 22;

[0134] FIG53 is a perspective view 2 of the crank in specific embodiment 22;

[0135] FIG54 is a schematic structural diagram of a pedal folding mechanism (folded state) in specific embodiment 23;

[0136] FIG55 is a schematic structural diagram of a folding vehicle in specific embodiment 23 (folded state);

[0137] FIG56 is a schematic structural diagram of a footrest folding mechanism in specific embodiment 25 (in unfolded state);

[0138] FIG57 is an enlarged structural diagram 1 of a crank and a fifth connecting member in specific embodiment 25;

[0139] FIG58 is an enlarged structural diagram 2 of a set of cranks and a fifth connecting member in specific embodiment 25 (the cranks are hidden);

[0140] FIG59 is an enlarged structural view 3 of a set of cranks and a fifth connecting member in specific embodiment 25 (the cranks are hidden);

[0141] Figure 60 is a structural schematic diagram of the crank in specific embodiment 25 (showing the hollow channel).

[0142] In the figure: 1000, folding frame; 1100, main beam; 1101, front beam; 1102, rear beam; 1103, curved portion; 1104, head tube; 1105, headlight; 1106, front wheel; 1107, rear wheel; 1108, second mounting hole; 1109, second mounting slot; 1110, third mounting slot; 1200, seat tube body; 1201, first connecting portion; 1202, first extension portion; 1300, rear fork; 1301, left arm; 1302 , right arm; 1303, crossbeam; 1304, pedal axle hole; 1305, first connecting shaft; 1306, intermediate gear shaft hole; 1400, first folding mechanism; 1500, shock absorption mechanism; 1501, spring; 1502, tendon; 1601, first sprocket; 1602, second sprocket; 1603, low gear chainring; 1604, high gear chainring; 1605, first chain; 1606, second chain; 1607, pedal crank; 1608, intermediate gear shaft.

[0143] 2000, second connecting mechanism for the front fork and the upright; 2100, second connecting member; 2110, second connecting groove; 2111, second internal thread; 2130, first mounting hole; 2140, countersunk hole; 2200, steering shaft; 2210, first connecting groove; 2211, first internal thread; 2212, first external thread; 2220, first step; 2230, positioning groove; 2300, first limiting bolt; 2310, head of the first limiting bolt; 2313, third external thread; 2400, bearing steel bowl; 2410, retaining ring; 2420, top screw; 2500, wave washer.

[0144] 3000, second folding mechanism for front fork and upright; 3100, third connecting member; 3110, second positioning hole; 3120, third positioning hole; 3130, first positioning pin; 3200, first locking member; 3210, first arm; 3211, first protrusion; 3212, second protrusion; 3213, sixth mounting hole; 3214, second stopper; 3220, second arm; 3222, second positioning pin; 3300, front fork; 3310, Third connecting axis; 3311, third mounting hole; 3320, fourth connecting axis; 3330, fourth mounting hole; 3340, fourth positioning hole; 3350, first elastic portion; 3360, second elastic portion; 3370, fifth mounting hole; 3380, first position-limiting member; 3400, hook; 3410, crossbar; 3411, slot; 3420, hollow portion; 3430, elastic pad; 3440, mounting hole for connecting the fourth connecting axis; 3500, vertical pole;

[0145] 4000, first connecting member; 4100, tenon; 4110, groove; 4120, first mounting slot; 4130, bolt; 4200, second step portion; 4300, locking hole; 4400, hinge portion; 4500, seventh mounting hole;

[0146] 5000, folding footrest mechanism; 5100, fifth connecting member; 5110, fifth positioning hole; 5120, fifth connecting shaft; 5130, third protrusion; 5131, ninth mounting hole; 5140, fifth protrusion; 5141, eleventh mounting hole; 5150, thirteenth mounting hole; 5160, fifth recess; 5170, sixth recess; 5180, fifth extension; 5181, seventh positioning portion; 5182, seventh protrusion; 5183, seventh slot; 5184, protruding step; 51 85. Fixing bolt; 5200. Crank; 5210. Positioning portion; 5230. Fourth protrusion; 5231. Tenth mounting hole; 5240. Sixth protrusion; 5241. Twelfth mounting hole; 5250. Hollow channel; 5251. Through hole; 5252. Seventh positioning hole; 5260. Seventh positioning pin; 5261. Inclined surface; 5262. Push rod; 5270. Seventh elastic portion; 5280. Magnetic positioning portion; 5300. Sixth connecting member; 5400. Pedal; 5500. Pedal center axis.

[0147] 6000, handle; 7000, third folding mechanism. DETAILED DESCRIPTION

[0148] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0149] 1 to 9, a specific embodiment 1, a specific embodiment 1, a folding frame 1000 of this embodiment 1, including a main beam 1100, a seat tube body 1200 and a rear fork 1300, the main beam 1100 and the seat tube body 1200 are connected by a first folding mechanism 1400, the rear fork 1300 is provided with a pedal axle hole 1304, the rear fork 1300 is connected to the seat tube body 1200, and the pedal axle hole 1304 is located in front of the seat tube body 1200, so that the rear fork 1300 can be folded. 0 is moved forward as much as possible, effectively utilizing the space below the frame from the first folding mechanism 1400 to the seat tube body 1200, reducing the overall length of the frame (i.e., the distance between the left and right ends of the folded folding bicycle as viewed from the main view in Figure 8). When the frame is folded, the folded frame length (corresponding to the longitudinal direction) can be effectively reduced, i.e., the lateral space occupied by the folded frame is reduced. A folding bicycle (including but not limited to a folding bicycle or folding electric vehicle) using this folding frame 1000 is more convenient to store and carry after folding. The first folding mechanism 1400 is prior art; as long as it can achieve folding of the main beam 1100 and the seat tube body 1200, it will not be discussed in detail here. The pedal axle hole 1304 is used to mount the pedal crank 1607 to connect the pedals.

[0150] Preferably, another specific embodiment 2, referring to FIG2 , is different from embodiment 1 in that: the rear fork 1300 is axially connected to the seat tube body 1200, for example, by a first connecting shaft 1305, that is, the connection between the rear fork 1300 and the seat tube body 1200 is the first connecting shaft 1305, and the first connecting shaft 1305 can be equipped with a wear-resistant sleeve or a bearing to enable the two ends of the rear fork to rotate around the first connecting shaft 1305 as the axis, thereby cooperating with the shock-absorbing mechanism to play a vibration-reducing role.

[0151] For example, the rear fork 1300 includes a left arm 1301 and a right arm 1302. The front ends of the left arm 1301 and the right arm 1302 are connected by a crossbeam 1303. Both the left arm 1301 and the right arm 1302 are connected to the seat tube body 1200 via a first connecting shaft 1305. A pedal axle hole 1304 extends through the crossbeam 1303, further strengthening the connection between the rear fork 1300 and the seat tube body 1200. In this case, the pedal axle hole 1304 is located in front of the first connecting shaft 1305. The distance between the front end of the rear fork 1300 (i.e., the front side of the crossbeam 1303) and the axis of the first connecting shaft 1305 is the distance that can be saved in lateral length of the frame.

[0152] Preferably, the distance between the front end of the rear fork 1300 and the axis of the first connecting shaft 1305 is approximately one-third to one-quarter of the length of the rear fork 1300. In other words, the distance between the front end of the rear fork 1300 and the axis of the first connecting shaft 1305 is equal to or slightly larger than the diameter of the first chainring connected to the pedal axle hole 1304. This positions the first chainring in front of the seat tube body 1200, effectively utilizing the space in front of the seat tube body 1200. The length of the rear fork 1300 refers to the distance from the front end to the rear end of the rear fork 1300. The front end of the rear fork 1300 refers to the end of the rear fork 1300 facing the front wheel 1106. The rear end of the rear fork 1300 refers to the end connected to the rear wheel 1107.

[0153] Alternatively, the left arm 1301 and the right arm 1302 are respectively connected to the seat tube body 1200 through the first connecting shaft 1305, which does not occupy the internal space of the seat tube body 1200 and does not affect the storage of the seat post into the seat tube body 1200.

[0154] In addition, the distance between the front end of the rear fork 1300 and the axis of the first connecting shaft 1305 is less than or equal to the distance between the first folding mechanism 1400 and the axis of the tube body of the seat tube body 1200. In this way, after the folding bicycle is folded, the front end of the rear fork 1300 will not protrude from the first folding mechanism 1400, which not only fully utilizes the space under the frame from the first folding mechanism 1400 to the seat tube body 1200, but also avoids the front end of the rear fork 1300 protruding from the first folding mechanism 1400 after folding, thereby indirectly extending the length of the frame after folding and avoiding a significant reduction in the effect of reducing the overall length of the frame. Therefore, it is preferred that the vertical projection of the front end of the rear fork 1300 does not exceed the vertical projection of the first folding mechanism 1400.

[0155] Preferably, another specific embodiment 3, referring to FIG. 3 , differs from the previous embodiments in that a shock-absorbing mechanism 1500 is provided between the front end of the rear fork 1300 and the seat tube body 1200. This mechanism, coupled with the design of the connection between the rear fork 1300 and the seat tube body 1200 via the first connecting shaft 1305, provides for shock absorption or vibration reduction for the rear fork 1300. The distance between the front end of the rear fork 1300 and the axis of the first connecting shaft 1305 is smaller than the distance between the rear end of the rear fork 1300 (for connection to the rear wheel 1107) and the axis of the first connecting shaft 1305. By leveraging the principle of leverage, the shock-absorbing mechanism 1500 provides shock absorption or vibration reduction for the rear fork 1300, thereby improving the user comfort of the folding bicycle.

[0156] The shock absorbing mechanism 1500 includes an elastic part, which can be a spring 1501 or a tendon 1502 or other new elastic materials, or a spring 1501 plus a tendon 1502, and the tendon 1502 is nested inside the spring 1501, see Figure 4, increasing the pressure range that the shock absorbing mechanism 1500 can withstand or increasing the elastic force of the shock absorbing mechanism 1500, thereby achieving a stronger shock absorbing effect.

[0157] In the folding frame 1000 of this third embodiment, a shock-absorbing mechanism 1500 is provided between the bottom of the front end of the rear fork 1300 and the seat tube body 1200, as shown in Figure 4. Specifically, the seat tube body 1200 is provided with a first extension portion 1202 extending forward at a position corresponding to the lower portion of the front end of the rear fork 1300. The ends of the elastic member are respectively connected to the bottom of the front end of the rear fork 1300 and the first extension portion 1202 of the seat tube body 1200 (see Figures 1 to 3). Alternatively, as an alternative, the shock-absorbing mechanism 1500 is provided between the top of the front end of the rear fork 1300 and the seat tube body 1200. Specifically, the portion where the seat tube body 1200 connects to the first folding mechanism 1400 is the first connection portion 1201. The first connection portion 1201 is located above the front end of the rear fork 1300, and the ends of the elastic member are respectively connected to the top of the front end of the rear fork 1300 and the first connection portion 1201 of the seat tube body 1200. In both designs, the shock absorber mechanism 1500 is located in front of the seat tube body 1200, similar to the front end of the rear fork 1300. This effectively utilizes the space under the frame from the first folding mechanism 1400 to the seat tube body 1200, and the volume of the shock absorber mechanism 1500 is minimized, taking up minimal space.

[0158] When the rear end of the rear flat fork 1300 vibrates, the rear flat fork 1300 rotates with the first connecting shaft 1305 as a fulcrum, and the front end of the rear flat fork 1300 compresses or stretches the shock absorbing mechanism 1500. The shock absorbing mechanism 1500 can effectively reduce the movement amplitude of the front end of the rear flat fork 1300 or prevent the front end of the rear flat fork 1300 from moving, thereby achieving the shock absorption effect of the rear end of the rear flat fork 1300.

[0159] Preferably, another specific embodiment 4, referring to Figure 1, this embodiment 4 is different from the above-mentioned embodiment in that: the main beam 1100 is provided with a bending portion 1103, the rear end of the main beam 1100 is connected to the first folding mechanism 1400, the part of the main beam 1100 close to the first folding mechanism 1400 is the rear beam portion 1102, the part of the main beam 1100 close to the front end of the main beam 1101 is the front beam portion 1101, and the connection between the rear beam portion 1102 and the front beam portion 1101 forms a bending portion 1103, and the space below the bending portion 1103 is used to store the folded front wheel 1106. When the folding vehicle (including but not limited to a folding bicycle or a folding electric vehicle) using the folding frame 1000 is folded, the front wheel 1106 can be stored in the space below the bending portion 1103, so that the volume width of the folded folding vehicle (that is, the length of the distance between the upper and lower ends of the folding vehicle when viewed from the top in Figure 9) is shorter, the space occupied by the folded folding vehicle is smaller, and it is more convenient to store and carry.

[0160] For example, the rear beam 1102 may be angled with the horizontal plane, while the front beam 1101 may be horizontally disposed. Alternatively, the angle of the rear beam 1102 with the horizontal plane may be greater than the angle of the front beam 1101 with the horizontal plane, as long as the space below the curved portion 1103 can accommodate the folded front wheel 1106. Alternatively, the rear beam 1102 may be angled with the horizontal plane, while the front beam 1101 may be slightly inclined, as long as the space below the curved portion 1103 can accommodate the folded front wheel 1106.

[0161] Preferably, another specific embodiment 5, see Figure 1, this embodiment 5 is different from the previous embodiment in that: the rear fork 1300 is also provided with an intermediate gear shaft hole 1306 for connecting to the intermediate gear shaft 1608, for example, the intermediate gear shaft hole 1306 is located in the middle of the left arm 1301, the pedal middle shaft hole 1304 (for connecting the front gear) and the intermediate gear shaft hole 1306 are respectively located on both sides of the first connecting shaft 1305, and the rear end of the rear fork 1300 is connected to the rear wheel 1107 to form a design for realizing dual-chain drive. While ensuring the rotation speed of the rear wheel 1107, the length of the rear fork 1300 can be shortened to help reduce the overall volume of the folding bicycle after folding. While ensuring that the speed of the bicycle is not reduced, the dual-chain drive also makes the rider more labor-saving.

[0162] Of course, the intermediate gear shaft hole 1306 can also be set on the right arm 1302 according to actual conditions.

[0163] For example, the pedal axle hole 1304 is connected to the first sprocket 1601 (also called the chainring, corresponding to the front wheel 1106), and the intermediate gear shaft hole 1306 is coaxially connected to the low gear chainring 1603 and the high gear chainring 1604 through the intermediate gear shaft 1608 (the diameter of the low gear chainring 1603 is smaller than the diameter of the high gear chainring 1604). The first sprocket 1601 drives the low gear chainring 1603 to rotate through the first chain 1605, and the low gear chainring 1603 drives the coaxial high gear chainring 1604 to rotate to achieve high speed conversion. The high gear chainring 1604 rotates and then drives the second sprocket 1602 (also called the flywheel, corresponding to the rear wheel 1107) to rotate through the second chain 1606.

[0164] Preferably, another specific embodiment 6, referring to FIG1 , differs from the previous embodiments in that the left arm 1301, the right arm 1302, and the crossbeam 1303 are integrally formed. This ensures that the pedal center axle hole 1304 on the crossbeam 1303 and the intermediate gear shaft hole 1306 on the left arm 1301 are relatively fixed in position, preventing the chain from becoming loose or even falling off due to changes in their positions, thereby improving chain safety. Of course, the left arm 1301, the right arm 1302, and the crossbeam 1303 can also be formed by screw connection or welding.

[0165] Preferably, the inner area of ​​the intermediate gear shaft hole 1306 is larger than the cross-sectional area of ​​the intermediate gear shaft 1608, so as to facilitate adjustment or fine-tuning of the position of the intermediate gear shaft 1608, and help achieve a balance in the tightness of the first sprocket 1601 and the second sprocket 1602 corresponding to the first chain 1605 and the second chain 1606, ensuring that both chains are in good working condition and are not too loose or too tight. For example, the shape of the intermediate gear shaft hole 1306 can be an elongated strip, an oval, a rounded rectangle, etc.

[0166] The front end of the main beam 1100 is connected to the head pipe 1104. A headlight 1105 is provided at the front end of the head pipe 1104. The headlight 1105 is embedded in the head pipe 1104 without the need for additional mounting brackets. After installation, the volume of the headlight 1105 exposed to the outside is also minimized, thereby minimizing the impact of the headlight 1105 on the volume of the folded bicycle.

[0167] 10 to 13 , specific embodiment 7 is provided. This embodiment 7 provides a second connecting mechanism for a front fork and a vertical post, including a second connecting member 2100 for connecting the vertical post 3500, a steering shaft 2200 for connecting the front fork 3300, and a tightening member, wherein the second connecting member 2100 and the steering shaft 2200 are threadedly connected; a first mounting hole 2130 is provided on the second connecting member 2100, and a positioning groove 2230 is provided on the steering shaft 2200; one end of the tightening member passes through the first mounting hole 2130 and is embedded in the positioning groove 2230, thereby achieving relative position fixation between the second connecting member 2100 and the steering shaft 2200, and “relative position fixation” means that the second connecting member 2100 and the steering shaft 2200 will rotate or remain stationary synchronously. The tightening member can effectively limit the mutual rotation between the second connecting member 2100 and the steering shaft 2200, ensure the tightness of the connection between the second connecting member 2100 and the steering shaft 2200, ensure that the connection between the two is more firm and reliable, more non-slip, and not easy to disengage, and thus ensure that the connection between the handlebar stem and the front fork is firmer and more reliable, and the relative positions of the two will not change, thereby preventing the handlebar stem and the front fork from loosening.

[0168] Preferably, the pressing member is threadedly connected to the first mounting hole 2130, and one end of the pressing member (such as a jackscrew or a positioning bolt) is inserted into the positioning groove 2230 and then presses against the steering shaft 2200. The pressing member exerts a circumferential restraining force on the steering shaft 2200 through the positioning groove 2230, thereby limiting the rotation of the steering shaft 2200. At the same time, because the pressing member presses against the steering shaft 2200 after being inserted into the positioning groove 2230, the pressing member also exerts a radial pressure on the steering shaft 2200, which can increase the pressure intensity between the steering shaft 2200 and the second connecting member 2100, increase the friction between the steering shaft 2200 and the second connecting member 2100, and effectively prevent the second connecting member 2100 and the steering shaft 2200 from rotating relative to each other.

[0169] Preferably, an axially elongated positioning groove 2230 is provided on the outer side of the steering shaft 2200. Regardless of how the depth of the threaded connection between the second connecting member 2100 and the steering shaft 2200 changes, for example, a few more or fewer rotations, the first mounting hole 2130 and the elongated positioning groove 2230 can be aligned. After the two are aligned, one end of the pressing member can always be inserted into the positioning groove 2230 after passing through the first mounting hole 2130 (the height position of the end of the pressing member in the positioning groove 2230 also changes accordingly), thereby circumferentially positioning the steering shaft 2200 and preventing the second connecting member 2100 and the steering shaft 2200 from rotating relative to each other. In other words, the elongated positioning groove 2230 can effectively cope with the height change of one end of the pressing member.

[0170] Compared with the clamp connection method used in the existing front fork and the upright, the second connecting mechanism 2000 for the front fork and the upright in this embodiment 7 is smaller in size. For example, the height of the connecting mechanism 2000 for the front fork 3300 and the upright 3500 is shorter. The connecting mechanism 2000 for the front fork 3300 and the upright 3500 in this embodiment 7 is connected by a thread between the steering shaft 2200 and the second connecting member 2100. The two are circumferentially limited and tightened to each other by a tightening member to fix the relative position between the two. A stable threaded connection can be formed with a thread height of only about 3cm to 4cm, which indirectly realizes a stable connection between the front fork 3300 and the upright 3500, and can also make the overall volume or size of the folding vehicle (including but not limited to folding bicycles or folding electric vehicles) smaller, and the volume or size after folding will also be smaller.

[0171] Referring to Figures 10 to 15 , Embodiment 8 provides a second connection mechanism for a front fork and a column. Embodiment 8 differs from Embodiment 7 in that the connection mechanism further includes a first limiting bolt 2300, the outer surface of which is provided with a third external thread 2313. A first connection groove 2210 is provided at one end (e.g., the top end) of the steering shaft 2200, the inner sidewall of which is provided with a first internal thread 2211. A first external thread 2212 is provided at the outer side of this end of the steering shaft 2200, the first internal thread 2211 and the first external thread 2212 being oriented in opposite directions.

[0172] The second connecting member 2100 is provided with a second connecting groove 2110, and a second internal thread 2111 is provided in the second connecting groove 2110. One end of the steering shaft 2200 is embedded in the second connecting groove 2110, and the second internal thread 2111 matches the first external thread 2212 (that is, the two threads correspond to each other, realizing a threaded connection between the second connecting member 2100 and the steering shaft 2200); the first limiting bolt 2300 is embedded in the first connecting groove 2210, and the third external thread 2313 matches the first internal thread 2211 (that is, the two threads correspond to each other, realizing a threaded connection between the first limiting bolt 2300 and the steering shaft 2200). After the second connecting member 2100 and the first limiting bolt 2300 are respectively connected to the steering shaft 2200, the locking direction of the second connecting member 2100 and the steering shaft 2200 is exactly opposite to the locking direction of the first limiting bolt 2300 and the steering shaft 2200. Once the second connecting member 2100 and the first limiting bolt 2300 are against each other, the friction between the two is used to achieve synchronous rotation of the second connecting member 2100 and the first limiting bolt 2300. The first limiting bolt 2300 can achieve a good locking effect on the second connecting member 2100, making the connection between the second connecting member 2100 and the steering shaft 2200 more firm and reliable, avoiding reverse rotation between the second connecting member 2100 and the steering shaft 2200 (that is, rotation in the opposite direction to the locking direction, or in the loosening direction), and avoiding loosening between the second connecting member 2100 and the steering shaft 2200.

[0173] For example, assuming that the second connecting member 2100 and the steering shaft 2200 are connected by a forward thread (i.e., the second connecting member 2100 rotates clockwise relative to the steering shaft 2200 to tighten the two, such as the first external thread 2212 is a forward thread and the second internal thread 2111 is a forward thread), and the first limiting bolt 2300 and the steering shaft 2200 are connected by a reverse thread (i.e., the first limiting bolt 2300 rotates counterclockwise relative to the steering shaft 2200 to tighten the two, the first internal thread 2211 is a reverse thread and the third external thread 2313 is a reverse thread), once the second connecting member 2100 and the steering shaft 2200 are connected by a forward thread. Looseness occurs between them, that is, the second connecting member 2100 and the steering shaft 2200 rotate counterclockwise, and at this time, the first limiting bolt 2300 also rotates counterclockwise synchronously. The first limiting bolt 2300 and the steering shaft 2200 are tightened more and more, and the first limiting bolt 2300 is less rotatable. The second connecting member 2100 is simultaneously limited by the first limiting bolt 2300 and will not rotate, thereby achieving the purpose of limiting or stopping the rotation of the second connecting member 2100, thereby ensuring the tightness of the connection between the second connecting member 2100 and the steering shaft 2200, and ensuring that the connection between the two is more firm, reliable, more non-slip, and not easy to disengage.

[0174] As an alternative, the second connecting member 2100 and the steering shaft 2200 are connected by reverse threads, and the first limiting bolt 2300 and the steering shaft 2200 are connected by forward threads, which can also achieve the above technical effects. For example, the second connecting member 2100 and the steering shaft 2200 are connected by reverse threads (such as the first external thread 2212 is a reverse thread and the second internal thread 2111 is a reverse thread), and the first limiting bolt 2300 and the steering shaft 2200 are connected by forward threads (such as the first internal thread 2211 is a forward thread and the third external thread 2313 is a forward thread). In this way, the first limiting bolt 2300 can limit the second connecting member 2100 and help lock the second connecting member 2100 with the steering shaft 2200.

[0175] Preferably, the positions of the first internal thread 2211 and the first external thread 2212 on the steering shaft 2200 correspond to each other inside and outside. For example, the two overlap in the circumferential direction, but are respectively located on the inner and outer sides of the steering shaft 2200. This minimizes the space required for connecting the second connecting member 2100, the steering shaft 2200 and the first limiting bolt 2300, or reduces the size of the three after connection.

[0176] After the second connecting member 2100, the steering shaft 2200, and the first limiting bolt 2300 are installed, the head 2310 of the first limiting bolt abuts against the end surface of one end (e.g., the top) of the second connecting member 2100. Assuming that the tensioning member slides out of the positioning groove 2230, once the steering shaft 2200 and the second connecting member 2100 become loose, the second connecting member 2100 will inevitably move upward relative to the steering shaft 2200. At this time, the head 2310 of the first limiting bolt abuts against the top end surface of the second connecting member 2100, limiting the upward movement of the second connecting member 2100, thereby indirectly limiting the rotation of the second connecting member 2100 relative to the steering shaft 2200. In other words, the possibility of loosening between the second connecting member 2100 and the steering shaft 2200 is indirectly avoided or reduced. At the same time, as the second connecting member 2100 moves upward, the friction between the end face of one end (for example, the top) of the second connecting member 2100 and the head 2310 of the first limiting bolt also increases. At this time, if the second connecting member 2100 is to be rotated compared to the steering shaft 2200, it will drive the first limiting bolt 2300 to rotate synchronously. Because the first internal thread 2211 and the first external thread 2212 are in opposite directions, the first limiting bolt 2300 and the steering shaft 2200 will be tightened more and more, and the first limiting bolt 2300 will be more immovable. The first limiting bolt 2300 in turn uses friction to effectively limit the second connecting member 2100 from continuing to rotate, so that the second connecting member 2100 The positions of the second connecting member 2100 and the steering shaft 2200 are mutually locked, that is, the first limiting bolt 2300 has a locking effect on the second connecting member 2100 and the steering shaft 2200, so that the second connecting member 2100 and the steering shaft 2200 are not easily loosened or separated, and the connection is firm and has a good anti-slip effect, thereby indirectly ensuring that the vertical rod 3500 and the front wheel will not rotate, and the angles of the two can be kept consistent (for example, the initial angle is maintained, that is, the handlebar and the front wheel are perpendicular to each other), thereby preventing the handlebar connected to the vertical rod 3500 from changing in angle with the front wheel, or preventing the relative position of the handlebar vertical rod 3500 and the front fork 3300 from being inaccurate, which can easily cause the handlebar or front wheel to deviate from the direction when riding. This design can be said to be an additional safety insurance on the basis of Example 7, effectively preventing loosening between the second connecting member 2100 and the steering shaft 2200.

[0177] Preferably, the second connecting groove 2110 is a countersunk hole, and the countersunk hole 2140 of the countersunk hole is used to sink the head 2310 of the first limiting bolt. For example, the countersunk hole generally includes two parts, namely, a coaxially distributed hole and a countersunk hole. The hole (i.e., the through hole corresponding to the second internal thread 2111) cooperates with the screw (e.g., the first external thread 2212 corresponding to the steering shaft 2200 and the screw of the first limiting bolt 2300), and the countersunk hole 2140 is used to sink the screw head (e.g., the head 2310 of the first limiting bolt). This can increase the friction between the second connecting member 2100 and the head 2310 of the first limiting bolt. The head 2310 of the first limiting bolt is embedded in the countersunk hole 2140, and the appearance is also more beautiful.

[0178] Referring to Figures 11 to 12, specific embodiment 9, this embodiment 9 provides a second connecting mechanism for a front fork and a vertical rod. The difference between this embodiment 9 and the previous embodiments is that: the thread depth of the first internal thread 2211 is greater than the thread depth of the third external thread 2313, and the first limiting bolt 2300 can be more fully embedded in the first connecting groove 2210 of the steering shaft 2200, so that the head 2310 of the first limiting bolt is against the end face of the second connecting member 2100 or the countersunk hole 2140 of the second connecting member 2100, thereby exerting the locking and limiting effect of the first limiting bolt 2300 on the second connecting member 2100.

[0179] The thread depth of the third external thread 2313 is greater than the thread depth of the first external thread 2212, and the depth of the second internal thread 2111 is less than the depth of the third external thread 2313. Even if the second connecting member 2100 becomes loose or even detached from the steering shaft 2200, the third external thread 2313 and the first internal thread 2211 are still connected, and the first limiting bolt 2300 and the steering shaft 2200 will not separate. At this time, the first limiting bolt 2300 can also prevent the second connecting member 2100 from falling off the steering shaft 2200, and also provide a layer of safety for the connection between the upright 3500 and the front fork 3300, or provide a third layer of insurance for the safe riding of the folding bicycle.

[0180] The thread depth of the second internal thread 2111 is greater than the thread depth of the first external thread 2212. When the second connecting member 2100 and the steering shaft 2200 are connected, it can be ensured that the top end face of the second connecting member 2100 protrudes from the end face of the steering shaft 2200, so that the end face of the second connecting member 2100 is against the head 2310 of the first limiting bolt, and the end face of the steering shaft 2200 does not contact the head 2310 of the first limiting bolt, so as to avoid the head 2310 of the first limiting bolt from generating friction on the steering shaft 2200, and avoid affecting the locking effect of the first limiting bolt on the second connecting member 2100.

[0181] Referring to Figures 10 to 19 , Embodiment 10 provides a second connection mechanism for a front fork and a vertical column. Embodiment 10 differs from the previous embodiments in that a bearing steel bowl 2400 is mounted on the steering shaft 2200. A gap exists between the bearing steel bowl 2400 and the second connecting member 2100, and an elastic member is disposed within the gap. The elastic member can be used to fill the gap, particularly when the second connecting member 2100 and the steering shaft 2200 are axially adjusted, thereby affecting the size of the gap. The elastic member can also be used to compress the bearing steel bowl 2400, ensuring that the bearing steel bowl 2400 is stably connected to a fixed position on the outer side of the steering shaft 2200, thereby preventing the bearing steel bowl 2400 from sliding axially.

[0182] For example, a step portion 2220 is provided on the outer side surface of the steering shaft 2200, and the step portion 2220 is located below the first external thread 2212. After the steering shaft 2200 is nested in the bearing steel bowl 2400, the bottom of the bearing steel bowl 2400 is placed on the step portion 2220 (that is, the bearing steel bowl 2400 is installed on the step portion), or the bearing in the bearing steel bowl 2400 is interference fit with the steering shaft 2200. After the steering shaft 2200 is installed with the second connecting member 2100, the second connecting member 2100 presses the elastic member, and the elastic member presses the bearing steel bowl 2400. The elastic member plays a role in adaptively adjusting the position of the bearing steel bowl 2400 fixed on the outer side surface of the steering shaft 2200 to prevent the bearing steel bowl 2400 from loosening in the axial direction with the steering shaft 2200.

[0183] Preferably, the elastic member is a wave washer 2500, which is small in size and has good elasticity. It can wrap around the steering shaft 2200 and provide uniform elastic force, so that the force (i.e. elastic force) pressing on the bearing steel bowl 2400 is more uniform.

[0184] Preferably, a retaining ring 2410 is further provided above the bearing steel bowl 2400 , and the retaining ring 2410 and the bearing steel bowl 2400 are both located below the elastic member, and the wave washer 2500 presses the retaining ring 2410 and the bearing steel bowl 2400 together.

[0185] In addition, while the elastic member presses the bearing steel bowl 2400, it also has an axial elastic force on the second connecting member 2100 above it, which can help increase the friction between the second internal thread 2111 of the second connecting member 2100 and the first external thread 2212 of the steering shaft 2200, reduce the possibility of reverse rotation between the two (i.e., rotation in the opposite direction to the locking direction, or the loosening direction), and help improve the firmness and reliability of the connection between the second connecting member 2100 and the steering shaft 2200.

[0186] 20 to 27 and 29 , a specific embodiment 11 is provided. This embodiment 11 provides a second folding mechanism for a front fork and a vertical column. The second folding mechanism includes a third connecting member 3100 for connecting the vertical column 3500 and a front fork 3300. The third connecting member 3100 and the front fork 3300 are connected via a third connecting shaft 3310. For example, the front fork 3300 is provided with a third mounting hole 3311, and the third connecting shaft 3310 is mounted within the third mounting hole 3311. The third connecting member 3100 and the front fork 3300 can rotate or flip relative to each other along the third connecting shaft 3310 to achieve an unfolded state and a folded state between the third connecting member 3100 and the front fork 3300.

[0187] The third connecting member 3100 is provided with a rotatable locking member 3200 having a first protrusion 3211. The front fork 3300 is connected to the hook 3400 via a fourth connecting shaft 3320. The hook 3400 has a slot 3411. The first protrusion 3211 cooperates with the slot 3411 to achieve a locked or unlocked state between the locking member 3200 and the hook 3400. When the third connecting member 3100 and the front fork 3300 are in an extended state, the first protrusion 3211 cooperates with the slot 3411, i.e., the first protrusion 3211 fits into the slot 3411, locking the locking member 3200 and the hook 3400. The relative position between the third connecting member 3100 and the front fork 3300 is fixed. In this state, the extended third connecting member 3100 and the front fork 3300 are safer and more reliable to use. When the third connecting member 3100 and the front fork 3300 need to be changed into a folded state, for example, by rotating the locking member 3200 so that the first protrusion 3211 and the slot 3411 are separated, the locking member 3200 and the hook 3400 are in an unlocked state, and the third connecting member 3100 and the front fork 3300 can rotate relative to each other along the third connecting axis 3310 so that the front fork 3300 and the front wheel 1106 are folded up. For example, the front fork 3300 is folded backward, and the space under the frame is used to store the front fork 3300 and the front wheel 1106, thereby reducing the size of the folded folding bicycle. The size of a folding bicycle refers to the size of the space occupied by the length, width and height of the folding bicycle.

[0188] Preferably, the top of the first protrusion 3211 is curved, facilitating easier switching between the locked and unlocked states of the locking member 3200 and the hook 3400 after the locking member 3200 is flipped. Specifically, the first protrusion 3211 of the locking member 3200 matches the slot 3411 of the hook 3400 (i.e., the first protrusion 3211 fits within the slot 3411), thereby locking the locking member 3200 and the hook 3400. Rotating the locking member 3200 to change the orientation of the first protrusion 3211 can cause the first protrusion 3211 and the slot 3411 to align, facilitating separation of the locking member 3200 and the hook 3400, and achieving an unlocked state between the locking member 3200 and the hook 3400. Switching between the locked and unlocked states can be accomplished simply by rotating the locking member 3200, making it more convenient to use.

[0189] Preferably, an elastic pad 3430 is provided in the slot 3411. The elastic pad 3430 is used to protect the hook 3400 and the locking member 3200. It can also make up for the gap between the first protrusion 3211 and the slot 3411, increase the friction between the first protrusion 3211 and the slot 3411, and indirectly increase the fastening force between the first protrusion 3211 and the slot 3411.

[0190] The bottom of the elastic pad 3430 is an arc surface, corresponding to the arc surface of the first protrusion 3211. When the locking member 3200 is locked with the hook 3400, the two arc surfaces fit together. For example, the top of the first protrusion 3211 is an outward convex arc surface, and the bottom of the elastic pad 3430 is an inward concave arc surface.

[0191] In addition, the upright pole 3500 and the third connecting member 3100 may also be indirectly connected via a steering shaft 2200, as shown in Figure 29. The steering shaft 2200 is used to connect or indirectly connect to the folding frame 1000 of the folding bicycle.

[0192] 20 to 28 , a specific embodiment 12 is provided. This embodiment 12 provides a second folding mechanism for a front fork and a vertical rod. This embodiment 12 is different from the previous embodiment in that: the locking member 3200 is further provided with a second protrusion 3212, and the second protrusion 3212 is provided with a second limiting member 3214 for limiting the hook 3400 in the locked state. The hook 3400 is provided with a hollow portion 3420, the top of the hollow portion 3420 corresponds to the cross bar 3410 of the hook 3400, and the slot 3411 is provided at the bottom of the cross bar 3410. When the locking member 3200 and the hook 3400 need to be locked, the locking member 3200 drives the first protrusion 3211 and the second protrusion 3212 to rotate synchronously while rotating, so that the first protrusion 3211 is turned to the locking angle (for example, when the first protrusion 3211 is facing upward). As long as the hook 3400 is rotated so that the slot 3411 and the first protrusion 3211 are connected, that is, the first protrusion 3211 is sunk into the slot 3411 (or the elastic pad 3430 in the slot 3411), the locking member 3200 and The locking state between the hooks 3400 indirectly realizes the locking and fixation between the third connecting member 3100 and the front fork 3300. At this time, the front fork 3300 and the front wheel 1106 are in the unfolded state, and the connection between the front fork 3300 and the vertical rod 3500 is firm, which is convenient for the user to ride the unfolded folding bicycle. At the same time, the second limiting member 3214 is located in front of the cross bar 3410 of the hook 3400, and is used to limit the cross bar 3410 to prevent the first protrusion 3211 and the slot 3411 from accidentally slipping off, avoiding accidental separation of the locking member 3200 and the hook 3400, ensuring that the locking state of the locking member 3200 and the hook 3400 is more stable, and improving the safety of use of the front fork 3300 and the vertical rod 3500 in the unfolded state.

[0193] When unlocking is required between the locking member 3200 and the hook 3400, as long as the locking member 3200 is rotated (for example, in the opposite direction), the locking member 3200 drives the first protrusion 3211 and the second protrusion 3212 to rotate synchronously while rotating, so that the first protrusion 3211 leaves the locking angle (for example, when the first protrusion 3211 changes from upward to forward), the first protrusion 3211 and the card slot 3411 are staggered, and the first protrusion 3211 slides out of the card slot 3411. At this time, the first protrusion 3211 has no locking effect on the card slot 3411, and the hook 3400 can be rotated so that the hook 3400 and the lock are unlocked. When the fastener 3200 is separated, the unlocking state between the locking member 3200 and the hook 3400 is achieved, and the unlocking between the third connecting member 3100 and the front fork 3300 is indirectly achieved. At this time, the front fork 3300 and the front wheel 1106 can be rotated along the third connecting shaft 3310 to achieve the folding of the front fork 3300 and the front wheel 1106, and the second limiting member 3214 is synchronously flipped to the oblique lower part of the cross bar 3410 (see Figure 28). At this time, the second limiting member 3214 does not have a limiting effect on the cross bar 3410, and the hook 3400 can be flipped and disengaged from the locking member 3200, preparing for the folding of the front fork 3300.

[0194] Preferably, a sixth mounting hole 3213 is provided on the second protrusion 3212, and the second limiting member 3214 is a second limiting bolt, which is threadedly connected to the sixth mounting hole 3213. The threaded connection design between the sixth mounting hole 3213 and the second limiting bolt facilitates the assembly of the sixth mounting hole 3213 and the second limiting member 3214, and also facilitates the adjustment of the height of the second limiting bolt relative to the cross bar 3410 and the first protrusion.

[0195] 27 , specific embodiment 13, this embodiment 13 provides a second folding mechanism for a front fork and a vertical rod, and this embodiment 13 is different from the above-mentioned embodiment in that: the locking member 3200 is an L-shaped locking wrench, the locking wrench includes two first arms 3210 and second arms 3220 at right angles, the first arm 3210 is rotatably connected to the third connecting member 3100, the first protrusion 3211 and the second protrusion 3212 are arranged on the first arm 3210, the first protrusion 3211 and the second limiting member 3214 are in the same direction, such as keeping them synchronously upward, synchronously realizing the engagement of the first protrusion 3211 with the card slot 3411 and the limitation of the second limiting member 3214 on the cross bar 3410, the first protrusion 3211 and the second limiting member 3214 are synchronously flipped to realize the synchronous release of the above-mentioned engagement and limiting state. Specifically, when the first arm When the first arm 3210 rotates so that the first protrusion 3211 and the slot 3411 are engaged, realizing a locked state between the third connecting member 3100 and the front fork 3300, the second limit member 3214 is located in front of the cross bar 3410, and the second limit member 3214 limits the cross bar 3410. When the first arm 3210 rotates so that the first protrusion 3211 and the slot 3411 are separated, the first arm 3210 rotates so that the second protrusion 3212 and the second limit member 3214 flip in the hollow portion 3420, and the second limit member 3214 moves to the obliquely lower part of the cross bar 3410. The second limit member 3214 cannot limit the cross bar 3410, and the hook 3400 can flip freely, realizing the separation of the hook 3400 and the first arm 3210 of the locking wrench, that is, realizing the unlocked state between the third connecting member 3100 and the front fork 3300.

[0196] The top of the second limiting member 3214 is higher than the top of the first protrusion 3211 in order to better and effectively limit the cross bar 3410 .

[0197] The second protrusion 3212 and the second limiting member 3214 are driven by the first arm 3210 to flip in the hollow portion 3420, so that the second limiting member 3214 limits the crossbar 3410 of the hook 3400 in the locked state.

[0198] Preferably, the second arm 3220 is provided with a second positioning pin 3222 (such as a dividing pin), and the third connecting member 3100 is provided with a third positioning hole 3120. The second positioning pin 3222 matches the third positioning hole 3120 to achieve a detachable connection between the second arm 3220 of the locking wrench and the third connecting member 3100. When the locking member 3200 and the hook 3400 are locked, the second positioning pin 3222 is inserted into the third positioning hole 3120 to fix the position and state of the locking member 3200, prevent the locking member 3200 from rotating, and ensure that the locking state of the locking member 3200 and the hook 3400 is more stable. After the second positioning pin 3222 is pulled out from the third positioning hole 3120, the locking member 3200 can rotate, so that the user can drive the first arm 3210 to rotate by rotating the second arm 3220. The two ends of the first arm 3210 are installed in the two mounting holes (i.e., the third mounting hole 3311) of the third connecting member 3100, and the second protrusion 3212 and the second limit member 3214 are located between the two third mounting holes 3311. In this way, the installation and rotation of the first arm 3210 are more stable.

[0199] 30 , specific embodiment 14 is provided in this embodiment 14 as a second folding mechanism for a front fork and a vertical rod. This embodiment 14 is different from the aforementioned embodiments in that: the front fork 3300 is further provided with a first elastic portion 3350 (such as a first spring or an elastic portion made of other elastic materials) for tightening the hook 3400. When the locking member 3200 and the hook 3400 are separated, the first elastic portion 3350 tightens the hook 3400, so that the relative positions of the hook 3400 and the front fork 3300 are fixed, thereby preventing the hook 3400 from rotating and shaking and causing damage to the hook 3400. It can also help the hook 3400 to reset itself, that is, the hook 3400 quickly forms a locked state with the first protrusion 3211 of the locking member 3200 under the action of the first elastic portion 3350. When the locking member 3200 and the hook 3400 are locked, the first elastic portion 3350 also provides a certain fastening force between the locking member 3200 and the hook 3400, ensuring that the locking state of the locking member 3200 and the hook 3400 is more stable.

[0200] 30 to 32 , Embodiment 15 provides a second folding mechanism for a front fork and a vertical column. Embodiment 15 differs from the previous embodiments in that a fourth positioning hole 3340 is provided on the rear side of the front fork 3300, and a second positioning hole 3110 is provided on the rear side of the third connecting member 3100. After the front fork 3300 is folded, the second positioning hole 3110 and the fourth positioning hole 3340 are connected by a first positioning pin 3130. After the front fork 3300 and the front wheel 1106 are folded, the second positioning hole 3110 on the rear side of the third connecting member 3100 and the fourth positioning hole 3340 on the rear side of the front fork 3300 are connected by the first positioning pin 3130, thereby securing the front fork 3300 and the front wheel 1106 in the stowed state. This reduces the size of the folded foldable bicycle and makes the folded structure more stable and safer.

[0201] Referring to Figure 33, specific embodiment 16, this embodiment 16 provides a second folding mechanism for the front fork and the upright. The difference between this embodiment 16 and the previous embodiment is that: the front fork 3300 is provided with a fourth mounting hole 3330, and the fourth connecting shaft 3320 is located in the fourth mounting hole 3330. For example, a mounting hole 3440 for connecting the fourth connecting shaft is provided at the bottom of the hook 3400, and the fourth connecting shaft 3320 is located in the mounting hole, so that the hook 3400 can rotate along the fourth connecting shaft 3320, thereby realizing a locked state or an unlocked state between the hook 3400 and the locking member 3200.

[0202] The fourth mounting hole 3330 is a strip-shaped hole, and a second elastic portion 3360 (such as a second spring or an elastic portion made of other elastic material) is provided at the bottom inner side of the fourth mounting hole 3330. The top of the second elastic portion 3360 is connected to the fourth connecting shaft 3320. A fifth mounting hole 3370 is provided on the top of the front fork 3300. The fifth mounting hole 3370 is connected to the fourth mounting hole 3330. The first limiting member 3380 is connected to the fifth mounting hole 3370. The first limiting member 3380 and the second elastic portion 3360 act together on the fourth connecting shaft 3320 to adjust the position of the fourth connecting shaft 3320 in the fourth mounting hole 3330, see Figure 33. The first limiting member 3380 (such as a bolt or a top screw) and the second elastic part 3360 act together on the fourth connecting shaft 3320 to adjust the position of the fourth connecting shaft 3320 in the fourth mounting hole 3330. For example, when looseness occurs between the hook 3400 and the first protrusion 3211 of the locking member 3200, the first limiting member 3380 can be used to move the fourth connecting shaft 3320 downward in the fourth mounting hole 3330 (i.e., the bar hole), so that the hook 3400 and the locking member 3200 in the locked state are tightened, the fit is tighter, the use effect is better, and it is safer.

[0203] Referring to Figures 34 to 38 , Embodiment 17 provides a first connector for a folding frame. The folding frame 1000 includes a main beam 1100. A tenon 4100 is provided at one end of the first connector 4000 for embedding within the end of the main beam 1100. The tenon 4100 of the first connector 4000 is embedded within the main beam 1100 of the folding frame 1000. A portion of the first connector 4000 overlaps the main beam 1100, thereby enhancing the connection strength between the first connector 4000 and the main beam 1100. Folding vehicles employing the folding frame 1000 include, but are not limited to, folding bicycles and folding electric vehicles.

[0204] The outer wall of the tenon 4100 corresponds to the inner wall of one end of the main beam 1100, and there is a gap between the two. The outer wall of the tenon 4100 is provided with a groove 4110 for filling with adhesive (such as glue). The adhesive can be used to fill the gap between the tenon 4100 and the main beam 1100, so that after the tenon 4100 is embedded in the main beam 1100, the outer wall of the tenon 4100 and the inner wall of one end of the main beam 1100 are stuck together, which can also improve the connection strength between the first connecting member 4000 and the main beam 1100.

[0205] Preferably, a circle of grooves 4110 is provided on the outer wall of the tenon 4100, and the adhesive can evenly fill the gap between the tenon 4100 and the main beam 1100, bonding the outer wall of the tenon 4100 to the inner wall of one end of the main beam 1100, making the connection between the first connecting member 4000 and the main beam 1100 more secure.

[0206] The outer wall of the tenon 4100 is further provided with a second mounting hole 4120, and the main beam 1100 is provided with a first mounting hole 1108. The second mounting hole 4120 and the first mounting hole 1108 are connected by bolts 4130 to achieve the connection between the tenon 4100 and the main beam 1100.

[0207] Preferably, the groove 4110 is connected to the second mounting hole 4120. When the tenon 4100 is embedded in one end of the main beam 1100, the second mounting hole 4120 and the first mounting hole 1108 are aligned. At this time, adhesive can be injected into the groove 4110 through the first mounting hole 1108. The adhesive gradually flows in the groove 4110 until a circle of grooves 4110 is filled with adhesive. After the adhesive solidifies, the outer wall of the tenon 4100 is adhered to the inner wall of one end of the main beam 1100. This makes the operation simpler, more convenient, and more efficient, and also saves adhesive to the greatest extent.

[0208] Preferably, a second step portion 4200 is provided at the bottom of the tenon 4100 , and the second step portion 4200 is welded to the end portion of one end of the main beam 1100 to increase the connection strength between the first connecting member 4000 and the main beam 1100 .

[0209] The first connecting member 4000 in this embodiment 17 is connected to the main beam 1100 in a three-fold manner to increase the connection strength between the two. First, the tenon 4100 is embedded in the main beam 1100, and the second mounting hole 4120 is aligned with the first mounting hole 1108. The second step portion 4200 is first welded to the end of one end of the main beam 1100 to achieve the first connection. Then, adhesive is injected into the groove 4110 through the first mounting hole 1108 to fill a circle of the groove 4110. The outer wall of the tenon 4100 is adhered to the inner wall of one end of the main beam 1100 with the adhesive. This is the second connection. Finally, the second mounting hole 4120 and the first mounting hole 1108 are connected and fixed with bolts 4130 to achieve the connection between the tenon 4100 and the main beam 1100. This is the third connection. This can make the connection between the main beam 1100 (i.e., the frame 1000) and the first connecting member 4000 more firmly, greatly improving the connection strength between the two.

[0210] Referring to Figures 37 to 40 , Embodiment 18 provides a first folding mechanism for a folding bicycle, including the first connector for a folding bicycle frame described in Embodiment 17. A main beam 1100 is hollow, or a second mounting slot 1109 is provided at one end of the main beam 1100. A tenon 4100 at one end of a first connector 4000 engages within the end of the main beam 1100 or the second mounting slot 1109 at one end of the main beam 1100, thereby achieving a triple connection between the first connector 4000 and the main beam 1100 (or, in other words, a triple connection between the first connector 4000 and the main beam 1100). The other end of the first connector 4000 is hingedly connected to a seat tube body 1200, with the hinged portion 4400 forming the hinged portion. The seat tube body 1200 is used to connect to the rear fork and the seat cushion.

[0211] Preferably, the other end of the first connecting member 4000 is further provided with a locking hole 4300, and the seat tube body 1200 is provided with a second locking member 1203, which matches the locking hole 4300 to achieve the connection and fixation of the seat tube body 1200 and the first connecting member 4000 when the first folding mechanism is in the unfolded state.

[0212] Preferably, the shape of tenon 4100 matches the internal shape of one end of main beam 1100 or the internal shape of second mounting groove 1109 of main beam 1100. For example, if tenon 4100 is square, and the internal shape of one end of main beam 1100 or the internal shape of second mounting groove 1109 of main beam 1100 is square, circumferential rotation between main beam 1100 and tenon 4100 will not occur, ensuring a more secure and stable connection between the two. Of course, the shape of tenon 4100 and the internal shape of one end of main beam 1100 or the internal shape of second mounting groove 1109 of main beam 1100 may also be other shapes, as long as they match, prevent circumferential rotation between the two, and ensure a more secure and stable connection between the two.

[0213] When the seat tube body 1200 and the frame 1000 (i.e., the main beam 1100) need to be folded, the locking hole 4300 and the second locking member 1203 are separated, and the seat tube body 1200 and the first connecting member 4000 rotate through the hinge portion 4400. At this time, the first folding mechanism is in a folded state. When the seat tube body 1200 and the frame 1000 (i.e., the main beam 1100) need to be unfolded and fixed for use, the seat tube body 1200 and the first connecting member 4000 are rotated through the hinge portion 4400. 00 is rotated so that the locking hole 4300 and the second locking member 1203 correspond to each other and form a locking state (for example, the second locking member 1203 includes a pin, and the pin is embedded in the locking hole 4300). At this time, the first folding mechanism is in the unfolded state, and the main beam 1100 (i.e., the frame 1000) is more firmly connected to the first connecting member 4000, which can also indirectly achieve a stronger connection between the seat tube body 1200 and the frame 1000 (i.e., the main beam 1100), making the folding bicycle safer to ride.

[0214] 41 to 43 , a nineteenth embodiment is provided. This embodiment provides a connection mechanism between a folding bicycle frame and a vertical post, including the first connection member for a folding bicycle frame according to the seventeenth embodiment. The main beam 1100 is hollow or a third mounting groove 1110 is provided at the other end of the main beam 1100. The tenon 4100 at one end of the first connection member 4000 is embedded in the other end of the main beam 1100 or in the third mounting groove 1110 at one end of the main beam 1100, thereby connecting the first connection member 4000 to the main beam 1100.

[0215] The vertical pole 3500 is connected to the steering shaft 2200, and the other end of the first connecting member 4000 is connected to the steering shaft 2200. For example, the other end of the first connecting member 4000 is provided with a seventh mounting hole 4500 for mounting the steering shaft 2200. The steering shaft 2200 is sleeved in the seventh mounting hole 4500, and the connection and fixation between the steering shaft 2200 and the main beam 1100 of the frame 1000 is realized through the first connecting member 4000.

[0216] Referring to Figures 44 to 49, specific embodiment 20, this embodiment 1 provides a folding mechanism for a crank and a pedal axle, including a crank 5200, one end of the crank 5200 is connected to a fifth connecting member 5100 via a fifth connecting shaft 5120, and the fifth connecting member 5100 is connected to the pedal axle 5500. For example, the fifth connecting member 5100 is connected to the pedal axle 5500 via a thirteenth mounting hole 5150, and the pedal axle 5500 is connected to the rear fork 1300.

[0217] One end of the crank 5200 is provided with a positioning portion 5210, and the fifth connecting member 5100 is provided with a fifth positioning hole 5110 or a fifth positioning slot. The positioning portion 5210 mates with the fifth positioning hole 5110 or the fifth positioning slot, thereby facilitating the positioning of the crank 5200 along the fifth connecting axis 5120 relative to the pedal axle 5500 after folding. For example, a 180° fold allows the crank 5200 to be positioned at two angles relative to the fifth connecting member 5100. When the folding bicycle is folded, both cranks 5200 can face downward (for example, the two cranks 5200 face in the same direction and overlap, folding at opposite ends of the pedal axle 5500). Adjusting the direction of the cranks 5200 adjusts the shape of the entire pedal mechanism, further reducing the size of the folded bicycle to facilitate storage of the pedals 5400. The folded size of the folded bicycle refers to the three-dimensional volume formed by the length, width, and height of the outermost portion of the folded bicycle.

[0218] As an optional alternative, a fifth positioning hole 5110 or a fifth positioning groove may be further provided at one end of the crank 5200, and the fifth connecting member 5100 may be provided with a positioning portion 5210, and the positioning portion 5210 may match the fifth positioning hole 5110 or the fifth positioning groove, so as to achieve the positioning effect after the crank 5200 is folded along the fifth connecting axis 5120.

[0219] The other end of the crank 5200 is connected to the sixth connecting member 5300, and the sixth connecting member 5300 is connected to the foot pedal 5400 through the sixth connecting axis (not shown in the accompanying drawings). The foot pedal 5400 can be folded along the sixth connecting axis to achieve folding of the foot pedal 5400 for easy storage, making full use of the internal space of the folded folding bicycle and reducing the size of the folded folding bicycle.

[0220] The connection structures of the left and right cranks 5200, the pedal axle 5500 and the pedals 5400 are exactly the same. When the left and right cranks 5200 are opposite to each other, it is convenient to ride. When the two cranks 5200 overlap, the folding bicycle can be folded as a whole, reducing the occupied space and facilitating storage.

[0221] Specifically, the fifth connecting member 5100 is provided with a third protrusion 5130, and the third protrusion 5130 is provided with a ninth mounting hole 5131. Two fourth protrusions 5230 are provided at one end of the crank 5200. The top of the fourth protrusion 5230 is arc-shaped to facilitate the flipping of the crank 5200. The fourth protrusion 5230 is provided with a tenth mounting hole 5231. When the third protrusion 5130 is embedded in the inner recess between the two fourth protrusions 5230, the two tenth mounting holes 5231 and the ninth mounting hole 5131 are connected by the fifth connecting shaft 5120. The front and rear sides of the fourth protrusion 5230 are each provided with a positioning portion 5210. For example, each fourth protrusion 5230 A positioning portion 5210 is provided at the front and back (for example, a protruding positioning point A and a protruding positioning point B), and a fifth positioning hole 5110 (for example, two positioning holes) is provided on the fifth connecting member 5100 on both sides of the third protrusion 5130, so that the crank 5200 can be positioned forward and backward along the fifth connecting axis 5120. In this solution 1, the fifth connecting member 5100 is a male member, and the two fourth protrusions 5230 at one end of the crank 5200 form a female member. The fifth connecting member 5100 can also be designed as a female member and one end of the crank 5200 can be designed as a male member according to actual conditions, as long as the two can be folded and connected with the fifth connecting axis 5120.

[0222] The fifth positioning hole 5110 is located in the fifth recessed portion 5160 of the fifth connecting member 5100. The cross-section of the fifth recessed portion 5160 is arc-shaped, and the cross-section of the top of the two fourth protrusions 5230 is arc-shaped. The two fourth protrusions 5230 are respectively matched with the corresponding fifth recessed portions 5160, that is, when one end of the crank 5200 rotates along the fifth connecting axis 5120, the top of the fourth protrusion 5230 rotates in the corresponding fifth recessed portion, so that the positioning portions 5210 on the front and rear sides of the fourth protrusion 5230 form different positioning states with the fifth positioning hole 5110, that is, the crank 5200 is in an unfolded state (for normal riding) and the crank 5200 is in a folded state (for storing pedals when the folding bicycle is folded, thereby reducing the size of the folding bicycle after folding).

[0223] Referring to Figures 44 to 49, Embodiment 21 provides a pedal folding mechanism. This embodiment 21 includes a folding mechanism for a crank and pedal axle of Embodiment 20. The other end of the crank 5200 is connected to a sixth connecting member 5300, which is connected to a pedal 5400 via a sixth connecting shaft. When the folding bicycle is folded and stored, the pedal can be rotated via the sixth connecting shaft and stored inside the bicycle, minimizing the size of the folded bicycle.

[0224] 50 to 53, a specific embodiment 22 is provided. This embodiment 22 provides a folding mechanism for a crank and a pedal axle. The difference between this embodiment 22 and embodiment 20 is that: the fifth connecting member 5100 is provided with two fifth protrusions 5140, the fifth protrusion 5140 is provided with an eleventh mounting hole 5141 and a fifth positioning hole 5110, one end of the crank 5200 is provided with a sixth protrusion 5240, the sixth protrusion 5240 is provided with a twelfth mounting hole 5241, and the sixth positioning hole 5110 is provided on the sixth protrusion 5240. Two positioning portions 5210 are provided on each side of the protrusion 5240. The two positioning portions 5210 on the same side are located on either side of the twelfth mounting hole 5241. When the sixth protrusion 5240 is inserted into the recessed portion between the two fifth protrusions 5140, the two eleventh mounting holes 5141 and the twelfth mounting hole 5241 are connected by the fifth connecting shaft 5120. At this point, the fifth positioning hole 5110 and the positioning portions 5210 can achieve two positioning effects for the front and back of the crank 5200. In this second embodiment, the fifth connecting member 5100 is a female component, and one end of the crank 5200 is a male component.

[0225] The cross-section of the top of the fifth protrusion 5140 is arc-shaped, and two sixth inner recesses 5170 are provided on the end surface of one end of the crank 5200. The cross-section of the sixth inner recess 5170 is arc-shaped. The two sixth inner recesses 5170 are respectively located on both sides of the sixth protrusion 5240, and the two sixth inner recesses 5170 are respectively matched with the corresponding fifth protrusion 5140, that is, when one end of the crank 5200 rotates or folds along the fifth connecting axis 5120, the top of the fifth protrusion 5140 rotates in the corresponding sixth inner recess 5170, so that the two groups of positioning parts 5210 provided on both sides of the sixth protrusion 5240 are positioned in corresponding positions, and respectively form different positioning states with the fifth positioning hole 5110, that is, the crank 5200 is in an unfolded state (for normal riding) and the crank 5200 is in a folded state (for storing pedals when the folding bicycle is folded, thereby reducing the size of the folding bicycle after folding).

[0226] Preferably, the fifth positioning hole 5110 is located below the eleventh mounting hole 5141, raising the position of the eleventh mounting hole 5141 to facilitate the rotation of the crank 5200 along the fifth connecting axis, while at the same time satisfying the positioning of the fifth positioning hole 5110 with the corresponding positioning portion 5210, thereby realizing the transformation of the crank 5200 into different states.

[0227] Referring to Figures 50 to 55 , Embodiment 23 provides a pedal folding mechanism. This embodiment 23 includes a folding mechanism for a crank and pedal axle of Embodiment 21. The other end of the crank 5200 is connected to a sixth connecting member 5300, which is connected to a pedal 5400 via a sixth connecting shaft. When the folding bicycle is folded and stored, the pedal can be rotated via the sixth connecting shaft and stored inside the bicycle, minimizing the size of the folded bicycle. See Figures 54 and 55 .

[0228] 5 and 8 , a specific embodiment 24 is provided. This embodiment 24 is different from the aforementioned embodiments in that the folding vehicle further includes a second connecting member 2100 and an upright pole 3500 that are foldably connected via a connecting shaft. For example, the upright pole and the second connecting member 2100 can be unfolded, fixed, and folded for storage via a third folding mechanism 7000. The third folding mechanism 7000 belongs to the prior art, and includes, for example, a connecting shaft for realizing mutual rotation between the second connecting member 2100 and the upright pole 3500, and a locking hole and a locking pin for fixing the relative positions of the second connecting member 2100 and the upright pole 3500 when the second connecting member 2100 and the upright pole 3500 are unfolded.

[0229] The folding bicycle also includes a foldable handle 6000. The folding of the handle 6000 also belongs to the existing technology. For example, similar to the third folding mechanism, a connecting axis is used to realize a foldable connection between the handle 6000 and the vertical pole 3500, that is, the handle 6000 is flipped along the corresponding connecting axis. After the handle 6000 is unfolded, the locking hole and locking pin (or other existing locking mechanisms) are used to realize the locking of the handle 6000 and the vertical pole 3500 to each other for easy riding.

[0230] Such designs are all intended to ensure that the folding bicycle has the smallest size after folding, without affecting the folding effects of other embodiments.

[0231] 56 to 60 , a specific embodiment 25 is provided. This embodiment 25 provides a folding mechanism for a crank and a pedal axle. This embodiment 25 differs from the previous embodiments in that: a fifth connecting member 5100 is provided with a fifth extension 5180, a seventh positioning portion 5181 is provided on the fifth extension 5180, a seventh protrusion 5182 is provided on the seventh positioning portion 5181, the seventh protrusion 5182 and the fifth extension 5180 form a seventh slot 5183, and a crank 5200 is provided with a seventh positioning hole 5252 (or a seventh positioning slot) and a movable seventh positioning pin 5260. When the crank 5200 is unfolded, the seventh positioning portion 5181 is embedded in the seventh positioning hole 5252 (or the seventh positioning slot). Inside, one end of the seventh positioning pin 5260 matches the seventh slot 5183, that is, when one end of the seventh positioning pin 5260 is embedded in the seventh slot 5183, it is used for positioning between the crank 5200 and the fifth extension portion 5180 (that is, to achieve the positioning effect after the crank 5200 is folded along the fifth connecting axis 5120, such as keeping the crank 5200 and the fifth extension portion 5180 side by side and overlapping, and the seventh positioning portion 5181 is embedded in the seventh positioning hole 5252), limiting the crank 5200 from flipping along the fifth connecting axis 5120, avoiding separation between the crank 5200 and the fifth extension portion 5180, avoiding affecting the user's stepping on the corresponding pedal 5400, and avoiding riding risks.

[0232] When the crank 5200 is unfolded (see Figures 56 to 58), the crank 5200 and the fifth extension portion 5180 overlap side by side, and the seventh positioning portion 5181 is embedded in the seventh positioning hole 5252 (or the seventh positioning groove), which is the first fixed connection point. In addition, one end of the crank 5200 is connected to the fifth connecting member 5100 through the fifth connecting shaft 5120, which is the second fixed connection point, to achieve two-point fixation between the crank 5200 and the fifth connecting member 5100. The connection between the crank 5200 and the fifth connecting member 5100 is more stable and secure. When the user steps on the pedal 5400 to flip it, the crank 5200 drives the fifth connecting member 5100 and its fifth extension portion 5180 to rotate accordingly more stably and securely.

[0233] By moving the seventh positioning pin 5260 so that one end of the seventh positioning pin 5260 is disengaged from the seventh retaining groove 5183, the crank 5200 can be folded, that is, the crank 5200 is separated from the fifth extension 5180. After the crank 5200 is rotated 180 degrees along the fifth connecting axis 5120, the two cranks 5200 are in the same direction (i.e., the cranks 5200 are folded). This facilitates folding of the folding bicycle, for example, by allowing both cranks 5200 to face downward (i.e., the two cranks 5200 are in the same direction and overlap, and the two cranks 5200 are folded at both ends of the pedal axle 5500). In other words, by adjusting the direction of the cranks 5200, the shape of the entire pedal mechanism can be adjusted, and the size of the folded folding bicycle can be further reduced to facilitate storage of the pedals 5400. The size of the folded folding bicycle refers to the three-dimensional volume formed by the length, width, and height of the outermost periphery of the folding bicycle.

[0234] The seventh positioning hole 5252 may also be replaced by a seventh positioning groove, as long as the seventh positioning portion 5181 can be embedded therein to achieve the positioning effect of the crank 5200 and the fifth extension portion 5180 .

[0235] The seventh positioning portion 5181 can be a bolt, which is threadedly connected to the fifth extending portion 5180 , and a circle of groove is formed between the head of the bolt and the fifth extending portion 5180 , and the circle of groove is the seventh clamping groove 5183 .

[0236] A hollow channel 5250 is provided in the crank 5200, and the seventh positioning pin 5260 moves in the hollow channel 5250. A seventh elastic part 5270 is also provided in the hollow channel 5250 corresponding to the other end of the seventh positioning pin 5260. The seventh positioning pin 5260 and the seventh elastic part 5270 are both arranged in the hollow channel 5250 in the crank 5200, which makes the overall appearance more beautiful.

[0237] In addition, the seventh elastic part 5270 can be a compression spring or other elastic part, one end of the compression spring is abutted against or connected to the other end of the seventh positioning pin 5260, and the other end of the compression spring is abutted against or connected to one end of the hollow channel 5250. The compression spring provides pressure or elastic force for the seventh positioning pin 5260, so that the seventh positioning pin 5260 is clamped with the seventh slot 5183 to prevent the two from accidentally disengaging; the crank 5200 is provided with a through hole 5251 connecting to the hollow channel 5250, and the push rod 5262 passes through the through hole 5251 to connect to the seventh positioning pin 5260, so that the user can use the push rod 5262 to drive the seventh positioning pin 5260 to move back and forth in the hollow channel 5250, so as to realize the operation of embedding one end of the seventh positioning pin 5260 into the seventh slot 5183 or disengaging one end of the seventh positioning pin 5260 from the seventh slot 5183.

[0238] A protruding step portion 5184 is provided on the fifth extension portion 5180 near the seventh positioning portion 5181. The shape of the protruding step portion 5184 matches the shape of the seventh positioning hole 5252 (or the seventh positioning groove). When the protruding step portion 5184 is embedded in the seventh positioning hole 5252 (or the seventh positioning groove), the upper and lower outer edges of the protruding step portion 5184 abut against the upper and lower inner walls of the seventh positioning hole 5252 to avoid a gap, or the outer edges of the protruding step portion 5184 abut against the inner wall of the seventh positioning hole 5252 to avoid a gap. This can prevent the crank 5200 and the fifth extension portion 5180 from shaking, especially when the user steps on the pedal 5400 to drive the crank 5200, the fifth extension portion 5180 and the fifth connecting member 5100 to rotate, the crank 5200 and the fifth extension portion 5180 will not shake.

[0239] The upper and lower outer edges of the protruding step portion 5184 refer to the two edges of the protruding step portion 5184 close to both sides of the fifth extension portion 5180, and the upper and lower inner walls of the seventh positioning hole 5252 refer to the two inner walls of the seventh positioning hole 5252 close to both sides of the crank 5200.

[0240] An inclined surface 5261 is provided on one side of the protruding step portion 5184 at one end of the seventh positioning pin 5260. For example, an inclined surface 5261 is provided at the bottom of one end of the seventh positioning pin 5260. In the process of one end of the seventh positioning pin 5260 being embedded in the seventh slot 5183, the inclined surface 5261 can help one end of the seventh positioning pin 5260 to be embedded in the seventh slot 5183 more quickly and accurately.

[0241] The crank 5200 is also provided with a magnetic positioning part 5280 (such as a magnet, a magnet or a magnetic part made of magnetic material), and the fifth connecting part 5100 is connected to the pedal center axis 5500 by a fixing bolt 5185. The distance between the magnetic positioning part 5280 and the fifth connecting axis 5120 is equal to the distance between the fixing bolt 5185 and the fifth connecting axis 5120; when the crank 5200 is folded, the magnetic positioning part 5280 and the pedal center axis 5500 (such as the fixing bolt 5185 of the pedal center axis 5500) are offset, and the magnetic positioning part 5280 uses magnetic force to tighten the pedal center axis 5500, so that the folded crank 5200 and the pedal center axis 5500 are mutually positioned, indirectly realizing the mutual positioning between the folded crank 5200 and the fifth connecting part 5100, and preventing the crank 5200 from moving after folding.

[0242] When the fifth extension portion 5180 is made of metal and the crank 5200 is unfolded, the crank 5200 in the unfolded state and the fifth extension portion 5180 overlap side by side, and the magnetic positioning portion 5280 can also tighten the fifth extension portion 5180 to help improve the positioning effect between the crank 5200 in the unfolded state and the fifth extension portion 5180.

[0243] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A folding bicycle, Features: The folding bicycle comprises a folding frame, which comprises a main beam (1100), a seat tube body (1200) and a rear fork (1300); the main beam (1100) and the seat tube body (1200) are connected via a first folding mechanism (1400); the rear fork (1300) is provided with a pedal middle axis hole (1304); the rear fork (1300) is connected to the seat tube body (1200); and the pedal middle axis hole (1304) is located in front of the seat tube body (1200).

2. A folding bicycle according to claim 1, Features: The rear flat fork (1300) is connected to the seat tube body (1200) via a first connecting shaft (1305); and / or a shock absorbing mechanism (1500) is provided between the front end of the rear flat fork (1300) and the seat tube body (1200) And / or the main beam (1100) is provided with a bent portion (1103).

3. A folding bicycle according to claim 2, Features: A shock absorbing mechanism (1500) is provided between the top of the front end of the rear flat fork (1300) and the seat tube body (1200); And / or a shock absorbing mechanism (1500) is provided between the bottom of the front end of the rear flat fork (1300) and the seat tube body (1200).

4. A folding bicycle according to claim 3, Features: The shock absorbing mechanism (1500) comprises an elastic member, the portion of the seat tube body (1200) connected to the first folding mechanism (1400) is a first connecting portion (1201), the first connecting portion (1201) is located above the front end of the rear flat fork (1300), and the two ends of the elastic member are respectively connected to the top of the front end of the rear flat fork (1300) and the first connecting portion (1201) of the seat tube body (1200); And / or the seat tube body (1200) is provided with a first extension portion (1202) extending forward at a position below the front end of the rear flat fork (1300) corresponding to the rear flat fork (1300), and the two ends of the elastic member are respectively connected to the bottom of the front end of the rear flat fork (1300) and the first extension portion (1202) of the seat tube body (1200).

5. A folding bicycle according to claim 4, Features: The rear end of the main beam (1100) is connected to the first folding mechanism (1400); the portion of the main beam (1100) close to the first folding mechanism (1400) is a rear beam portion (1102); the portion of the main beam (1100) close to the front end of the main beam (1100) is a front beam portion (1101); the connection between the rear beam portion (1102) and the front beam portion (1101) forms a curved portion (1103); and the space below the curved portion (1103) is used to store the folded front wheel (1106); The angle between the rear beam (1102) and the horizontal plane is greater than the angle between the front beam (1101) and the horizontal plane; or the rear beam (1102) and the horizontal plane form an angle, and the front beam (1101) is arranged horizontally; or the rear beam (1102) and the horizontal plane form an angle, and the front beam (1101) is arranged slightly inclined.

6. A folding bicycle according to claim 5, Features: The rear fork (1300) is also provided with an intermediate gear shaft hole (1306) for connecting with the intermediate gear shaft, and the pedal middle shaft hole (1304) and the intermediate gear shaft hole (1306) are respectively located on both sides of the first connecting shaft (1305); and / or the distance between the front end of the rear flat fork (1300) and the axis of the first connecting shaft (1305) is one third to one quarter of the length of the rear flat fork (1300); and / or the front end of the main beam (1100) is connected to a head pipe (1104), and a head light (1105) is provided at the front end of the head pipe (1104); and / or the inner area of ​​the intermediate gear shaft hole (1306) is larger than the cross-sectional area of ​​the intermediate gear shaft; and / or the distance between the front end of the rear fork (1300) and the axis of the first connecting shaft (1305) is less than or equal to the distance between the first folding mechanism (1400) and the axis of the seat tube body (1200); And / or the rear flat fork (1300) comprises a left side arm (1301) and a right side arm (1302), the front end of the left side arm (1301) and the front end of the right side arm (1302) are connected via a cross beam (1303), the left side arm (1301), the right side arm (1302) and the cross beam (1303) are integrally formed or the three are connected by screws or are welded, the pedal middle axis hole (1304) passes through the cross beam (1303), and an intermediate gear shaft hole (1306) is provided on the left side arm (1301) or the right side arm (1302); the left side arm (1301) and the right side arm (1302) are connected to the seat tube body (1200) via a first connecting shaft (1305); And / or the elastic member is a spring (1501) or a tendon (1502); or the elastic member is a spring (1501) and a tendon (1502), and the tendon (1502) is nested inside the spring (1501).

7. A folding bicycle according to claim 1 or 2 or 3 or 4 or 5 or 6, Features: The folding bicycle further comprises a second connecting mechanism for the front fork and the upright pole, the second connecting mechanism (2000) comprising a second connecting member (2100) for connecting the upright pole (3500), a steering shaft (2200) for connecting the front fork (3300) and a tightening member, the second connecting member (2100) and the steering shaft (2200) being threadedly connected; The second connecting member (2100) is provided with a first mounting hole (2130), and the steering shaft (2200) is provided with a positioning groove (2230); After one end of the tightening member passes through the first mounting hole (2130), it is embedded in the positioning groove (2230), thereby achieving relative position fixation between the second connecting member (2100) and the steering shaft (2200).

8. A folding bicycle according to claim 7, Features: The connection mechanism further comprises a first limiting bolt (2300), and the outer side surface of the first limiting bolt (2300) is provided with a third external thread (2313); A first connecting groove (2210) is provided at one end of the steering shaft (2200), a first internal thread (2211) is provided on the inner side wall of the first connecting groove (2210), and a first external thread (2212) is provided on the outer side surface of the steering shaft (2200), and the directions of the first internal thread (2211) and the first external thread (2212) are opposite; The second connecting member (2100) is provided with a second connecting groove (2110), a second internal thread (2111) is provided in the second connecting groove (2110), one end of the steering shaft (2200) is embedded in the second connecting groove (2110), and the second internal thread (2111) matches the first external thread (2212); The first limiting bolt (2300) is embedded in the first connecting groove (2210), and the third external thread (2313) matches the first internal thread (2211); After the second connecting member (2100), the steering shaft (2200) and the first limiting bolt (2300) are installed, the head of the first limiting bolt (2300) abuts against the end surface of one end of the second connecting member (2100).

9. A folding bicycle according to claim 8, Features: The positioning groove (2230) is an axially long strip-shaped positioning groove, and is arranged on the outer side surface of the steering shaft (2200); and / or the second connecting groove (2110) is a countersunk hole, and the countersunk hole (2140) of the countersunk hole is used to sink the head of the first limiting bolt (2300); and / or a bearing steel bowl (2400) is mounted on the steering shaft (2200), a gap is provided between the bearing steel bowl (2400) and the second connecting member (2100), and an elastic member is provided in the gap; 10. A folding bicycle according to claim 9, Features: The thread depth of the first internal thread (2211) is greater than the thread depth of the third external thread (2313); The thread depth of the third external thread (2313) is greater than the thread depth of the first external thread (2212), and the thread depth of the second internal thread (2111) is less than the thread depth of the third external thread (2313); The thread depth of the second internal thread (2111) is greater than the thread depth of the first external thread (2212).

11. A folding bicycle according to claim 10, Features: The first internal thread (2211) is a reverse thread, the first external thread (2212) is a forward thread, the third external thread (2313) is a reverse thread, and the second internal thread (2111) is a forward thread; or the first internal thread (2211) is a forward thread, the first external thread (2212) is a reverse thread, the third external thread (2313) is a forward thread, and the second internal thread (2111) is a reverse thread; and / or a threaded connection between the pressing member and the first mounting hole (2130), one end of the pressing member being inserted into the positioning groove (2230) and then pressing the steering shaft (2200); And / or the elastic member is a wave washer (2500); and / or a retaining ring (2410) is further provided above the bearing steel bowl (2400), and the retaining ring (2410) and the bearing steel bowl (2400) are both located below the elastic member. and / or the positions of the first internal thread (2211) and the first external thread (2212) on the steering shaft (2200) correspond inside and outside; and / or the second connecting member (2100) and the vertical pole (3500) are foldably connected via a connecting shaft; And / or the folding vehicle further comprises a foldable handle (6000).

12. A folding bicycle according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8 or 9 or 10 or 11, Features: The folding bicycle further comprises a second folding mechanism for the front fork and the upright pole, the second folding mechanism (3000) comprising a third connecting member (3100) for connecting the upright pole (3500) and the front fork (3300), the third connecting member (3100) and the front fork (3300) being connected via a third connecting shaft (3310); The third connecting member (3100) is provided with a rotatable first locking member (3200), the first locking member (3200) is provided with a first protrusion (3211), the front fork (3300) is connected to the hook (3400) via a fourth connecting shaft (3320), the hook (3400) is provided with a slot (3411), the first protrusion (3211) and the slot (3411) cooperate to achieve a locked state or an unlocked state between the first locking member (3200) and the hook (3400).

13. A folding bicycle according to claim 12, Features: The first locking member (3200) is further provided with a second protruding portion (3212), and the second protruding portion (3212) is provided with a second limiting member (3214) for limiting the position of the hook (3400) in the locked state; And / or the front fork (3300) is provided with a fourth mounting hole (3330), and the fourth connecting shaft (3320) is located in the fourth mounting hole (3330); the fourth mounting hole (3330) is a strip hole, and the inner bottom of the fourth mounting hole (3330) is provided with a second elastic part (3360), and the top of the second elastic part (3360) is connected to the fourth connecting shaft (3320), and the top of the front fork (3300) is provided with a fifth mounting hole (3370), and the fifth mounting hole (3370) is connected to the fourth mounting hole (3330), and the first limiting member (3380) is connected to the fifth mounting hole (3370), and the first limiting member (3380) and the second elastic part (3360) act together on the fourth connecting shaft (3320) to adjust the position of the fourth connecting shaft (3320) in the fourth mounting hole (3330).

14. A folding bicycle according to claim 13, Features: The first locking member (3200) is an L-shaped locking wrench, which comprises a first arm (3210) and a second arm (3220) which are at right angles, the first arm (3210) being rotatably connected to the third connecting member (3100), the first protrusion (3211) and the second protrusion (3212) being arranged on the first arm (3210), the first protrusion (3211) and the second limiting member (3214) having the same orientation, and the top end of the second limiting member (3214) being higher than the top end of the first protrusion (3211); The hook (3400) is provided with a hollow portion (3420), the top of the hollow portion (3420) corresponds to the cross bar (3410) of the hook (3400), the slot (3411) is arranged at the bottom of the cross bar (3410), the second protrusion (3212) and the second limiting member (3214) are driven by the first arm (3210) to flip in the hollow portion (3420), so that the second limiting member (3214) limits the cross bar (3410) of the hook (3400) in a locked state; The second arm (3220) is provided with a second positioning pin (3222), the third connecting member (3100) is provided with a third positioning hole (3120), and the second positioning pin (3222) matches the third positioning hole (3120), so as to realize a detachable connection between the second arm (3220) of the locking wrench and the third connecting member (3100); And / or the second protruding portion (3212) is provided with a second mounting hole (3213), the second limiting member (3214) is a second limiting bolt, and the second limiting bolt is threadedly connected to the second mounting hole (3213).

15. A folding bicycle according to claim 14, Features: A fourth positioning hole (3340) is provided on the rear side of the front fork (3300), a second positioning hole (3110) is provided on the rear side of the third connecting member (3100), and after the front fork (3300) is folded, the second positioning hole (3110) and the fourth positioning hole (3340) are connected via a first positioning pin (3130); And / or the front fork (3300) is further provided with a first elastic portion (3350) for tightening the hook (3400); and / or the top of the first protruding portion (3211) is an outwardly convex arc surface; and / or an elastic pad (3430) is provided in the slot (3411), and the bottom of the elastic pad (3430) is an inwardly concave arc surface; And / or the vertical pole (3500) and the third connecting member (3100) are connected via a steering shaft (2200).

16. A folding bicycle according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8 or 9 or 10 or 11 or 13 or 14 or 15, Features: The folding bicycle also includes a first connecting member for the folding bicycle frame, characterized in that one end of the first connecting member (4000) is provided with a tenon (4100) for embedding into one end of the main beam (1100).

17. A folding bicycle according to claim 16, Features: The outer side wall of the tenon (4100) is provided with a groove (4110) for filling with adhesive; and / or the outer side wall of the tenon (4100) is further provided with a second mounting hole (4120), the main beam (1100) is provided with a first mounting hole (1108), the second mounting hole (4120) and the first mounting hole (1108) are connected by bolts (4140), so as to realize the connection between the tenon (4100) and the main beam (1100); and / or a second step portion (4200) is provided at the bottom of the tenon (4100), and the second step portion (4200) is welded to the end portion of one end of the main beam (1100); 18. A folding bicycle according to claim 17, Features: The main beam (1100) is hollow or one end of the main beam (1100) is provided with a second installation groove (1109), and the tenon (4100) at one end of the first connecting member (4000) is embedded in one end of the main beam (1100) or embedded in the second installation groove (1109) at one end of the main beam (1100), so as to realize the connection between the first connecting member (4000) and the main beam (1100); the other end of the first connecting member (4000) is hinged with the seat tube body (1200); the other end of the first connecting member (4000) is also provided with a locking hole (4300), and the seat tube body (1200) is provided with a second locking member (1203), and the second locking member (1203) matches the locking hole (4300), so as to realize the connection and fixation between the seat tube body (1200) and the first connecting member (4000) when the folding mechanism is in the unfolded state; and / or the shape of the tenon (4100) matches the internal shape of one end of the main beam (1100) or the internal shape of the second mounting groove (1109) of the main beam (1100); and / or the outer side wall of the tenon (4100) is provided with a circle of grooves (4110), and the grooves (4110) are connected to the second mounting hole (4120); The main beam (1100) is hollow or the other end of the main beam (1100) is provided with a third installation groove (1110), and the tenon (4100) at one end of the first connecting member (4000) is embedded in the other end of the main beam (1100) or embedded in the third installation groove (1110) at one end of the main beam (1100), so as to realize the connection between the first connecting member (4000) and the main beam (1100), and the other end of the first connecting member (4000) is connected to the steering shaft (2200), and the steering shaft (2200) is connected to the vertical rod (3500).

19. A folding bicycle according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8 or 9 or 10 or 11 or 13 or 14 or 15 or 17 or 8, Features: The folding bicycle also includes a folding mechanism for a crank and a pedal center shaft, wherein one end of the crank (5200) is connected to a fifth connecting member (5100) via a fifth connecting shaft (5120), and the fifth connecting member (5100) is connected to the pedal center shaft (5500).

20. A folding bicycle according to claim 19, Features: A positioning portion (5210) is also provided at one end of the crank (5200), and the fifth connecting member (5100) is provided with a fifth positioning hole (5110) or a fifth positioning groove, and the positioning portion (5210) matches the fifth positioning hole (5110) or the fifth positioning groove; Or a fifth positioning hole (5110) or a fifth positioning groove is further provided at one end of the crank (5200), and a positioning portion (5210) is provided on the fifth connecting member (5100), and the positioning portion (5210) matches the fifth positioning hole (5110) or the fifth positioning groove.

21. A folding bicycle according to claim 20, Features: The fifth connecting member (5100) is provided with a third protruding portion (5130), and the third protruding portion (5130) is provided with a ninth mounting hole (5131). Two fourth protruding portions (5230) are provided at one end of the crank (5200), and the fourth protruding portion (5230) is provided with a tenth mounting hole (5231). When the third protruding portion (5130) is embedded in the inner recess between the two fourth protruding portions (5230), the two tenth mounting holes (5231) and the ninth mounting hole (5131) are connected via a fifth connecting shaft (5120). Positioning portions (5210) are respectively provided on the front and rear side surfaces of the fourth protruding portion (5230), and fifth positioning holes (5110) are respectively provided on the fifth connecting member (5100) on both sides of the third protruding portion (5130); The fifth positioning hole (5110) is located in the fifth inner recess (5160) of the fifth connecting member (5100), the cross section of the fifth inner recess (5160) is arc-shaped, the cross sections of the tops of the two fourth protrusions (5230) are arc-shaped, and the two fourth protrusions (5230) are matched with the corresponding fifth inner recesses (5160) respectively; The other end of the crank (5200) is connected to the sixth connecting member (5300), and the sixth connecting member (5300) is connected to the pedal (5400) via a sixth connecting shaft.

22. A folding bicycle according to claim 20, Features: The fifth connecting member (5100) is provided with two fifth protrusions (5140), the fifth protrusion (5140) is provided with an eleventh mounting hole (5141) and a fifth positioning hole (5110), a sixth protrusion (5240) is provided at one end of the crank (5200), the sixth protrusion (5240) is provided with a twelfth mounting hole (5241), two positioning portions (5210) are respectively provided on two side surfaces of the sixth protrusion (5240), and the two positioning portions (5210) on the same side surface are located on both sides of the twelfth mounting hole (5241), and when the sixth protrusion (5240) is embedded in the inner recess between the two fifth protrusions (5140), the two eleventh mounting holes (5141) and the twelfth mounting hole (5241) are connected through the fifth connecting shaft (5120); The fifth positioning hole (5110) is located below the eleventh mounting hole (5141); The cross section of the top of the fifth protrusion (5140) is arc-shaped, and two sixth recessed portions (5170) are provided on the end surface of one end of the crank (5200). The cross section of the sixth recessed portion (5170) is arc-shaped. The two sixth recessed portions (5170) are respectively located on both sides of the sixth protrusion (5240), and the two sixth recessed portions (5170) are respectively matched with the corresponding fifth protrusion (5140); The other end of the crank (5200) is connected to the sixth connecting member (5300), and the sixth connecting member (5300) is connected to the pedal (5400) via a sixth connecting shaft.

23. A folding bicycle according to claim 19, Features: The fifth connecting member (5100) is provided with a fifth extension portion (5180). The fifth extension portion (5180) is provided with a seventh positioning portion (5181). The seventh positioning portion (5181) is provided with a seventh protruding portion (5182). The seventh protruding portion (5182) and the fifth extension portion (5180) form a seventh card slot (5183). The crank (5200) is provided with a seventh positioning hole (5252) or a seventh positioning slot, and a movable seventh positioning pin (5260). When the crank (5200) is unfolded, the seventh positioning portion (5181) is embedded into the seventh positioning hole (5252) or the seventh positioning slot, and one end of the seventh positioning pin (5260) is matched with the seventh card slot (5183).

24. The folding bicycle according to claim 23, wherein: A hollow channel (5250) is provided inside the crank (5200). The seventh positioning pin (5260) moves inside the hollow channel (5250). A seventh elastic portion (5270) is further provided inside the hollow channel (5250) corresponding to the other end of the seventh positioning pin (5260). A through hole (5251) communicating with the hollow channel (5250) is provided on the crank (5200). A push rod (5262) passes through the through hole (5251) to connect the seventh positioning pin (5260); A convex step portion (5184) is provided on the fifth extension portion (5180) near the seventh positioning portion (5181). The shape of the convex step portion (5184) is matched with the shape of the seventh positioning hole (5252) or the seventh positioning slot. An inclined surface (5261) is provided on one end of the seventh positioning pin (5260) corresponding to one side of the convex step portion (5184); and / or a magnetic positioning portion (5280) is further provided on the crank (5200). The fifth connecting member (5100) is connected to the pedal spindle (5500) through a fixing bolt (5185). The distance between the magnetic positioning portion (5280) and the fifth connecting shaft (5120) is equal to the distance between the fixing bolt (5185) and the fifth connecting shaft (5120); and / or the fifth extension portion (5180) is made of metal.

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