A folding car

Abstract

The present invention provides a folding bicycle, which comprises a folding bicycle frame, which comprises a main beam, a seat tube body and a rear flat fork, wherein the main beam and the seat tube body are connected by a first folding mechanism, the rear flat fork is provided with a pedal middle axis hole, the rear flat fork is connected to the seat tube body, and the pedal middle axis hole is located in front of the seat tube body. The present invention solves the problem of how to further reduce the size of the folding bicycle after folding in the prior art.

Description

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 being folded, and are not convenient for storage and carrying.

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

[0004] The purpose of the present invention is to provide a folding bicycle, which mainly solves the problem of the prior art that how to reduce the size of the folding bicycle after folding.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is

[0006] A folding bicycle, characterized in that: the folding bicycle comprises a folding frame, the folding frame comprises a main beam, a seat tube body and a rear fork, the main beam and the seat tube body are connected by a first folding mechanism, the rear fork is provided with a pedal center axis hole, the rear 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 flat 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 flat 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, 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 at a position below the front end of the rear fork corresponding to the seat tube body, and two ends of the elastic member are respectively connected to the bottom of the front end of the rear 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 store 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 also provided with an intermediate gear shaft hole for connecting with the intermediate gear shaft, and the pedal middle 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 accounts for 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 flat fork comprises a left arm and a right arm, the front end of the left arm and the front end of the right arm are connected by a cross beam, the left arm, the right arm and the cross beam are integrally formed or the three are connected by screws or welded, the middle axis hole of the pedal passes through the cross beam, and the left arm or the right arm is provided with an intermediate gear axis hole; 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 comprises a first connecting mechanism for a front fork and a vertical rod, the first connecting mechanism comprises a second connecting member for connecting the vertical rod, a steering shaft for connecting the front fork and a tightening member, and the second connecting member and the steering shaft are threadedly connected;

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

[0025] After one end of the pressing member passes through the first mounting hole, it is embedded in the first positioning groove to achieve relative position fixing between the second connecting member and the steering shaft.

[0026] Furthermore, the first connection mechanism further comprises a first limiting bolt, and the outer side surface of the first limiting bolt is provided with a second 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 first internal thread and the first external thread are in opposite directions;

[0028] The second connecting member is provided with a second connecting groove, in which a second internal thread is provided, 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 second 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 first positioning groove is an axially long strip positioning groove, which is arranged 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 exists between the bearing steel bowl and the second connecting piece, and an elastic piece is arranged in the gap;

[0034] Further, the thread depth of the first internal thread is greater than the thread depth of the second external thread;

[0035] The thread depth of the second 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 second external thread;

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

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

[0038] and / or the pressing member and the first mounting hole are threadedly connected, and one end of the pressing member is inserted into the first positioning groove and then presses against the steering shaft;

[0039] And / or the elastic member is a wave washer; and / or a retaining ring is further arranged 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 correspond to each other on the steering shaft;

[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 pole, the second folding mechanism comprises a third connecting member for connecting the upright pole and the front fork, the third connecting member and the front fork being connected via a second 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 third 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 third mounting hole, and the third connecting shaft is located in the third mounting hole; the third mounting hole is a strip-shaped hole, a second elastic part is provided at the inner bottom of the third mounting hole, the top of the second elastic part is connected to the third connecting shaft, a fourth mounting hole is provided at the top of the front fork, the fourth mounting hole is connected to the third mounting hole, the first limiting member is connected to the fourth mounting hole, the first limiting member and the second elastic part act together on the third connecting shaft to adjust the position of the third connecting shaft in the third mounting hole;

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

[0048] The hook is provided with a hollow part, the top of the hollow part corresponds to the cross bar of the hook, the slot is arranged 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 part, 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, the third connecting member is provided with a third positioning hole, the second positioning pin matches the third positioning hole, so that the second arm of the locking wrench is detachably connected to the third connecting member;

[0050] And / or a fifth 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 fifth mounting hole.

[0051] Furthermore, a fourth positioning hole is provided at the rear side of the front fork, a second positioning hole is provided at the rear side of the third connecting member, and 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 protruding portion 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, 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] Further, 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 an eighth mounting hole, the main beam is provided with a second mounting hole, and the eighth mounting hole and the second mounting hole are connected by bolts to realize the connection between the tenon and the main beam;

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

[0059] Furthermore, the main beam is hollow or one end of the main beam is provided with a first mounting groove, and the tenon at one end of the first connecting member is embedded in one end of the main beam or embedded in the first mounting groove at one end of the main beam, so as to realize the connection between the first connecting member and the main beam; the other end of the first connecting member is hinged with the seat tube body; the other end of the first connecting member is also provided with a locking hole, and the seat tube body is provided with a second locking member, and the second locking member matches the locking hole, so as to realize the connection and fixation between 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 first 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 eighth mounting hole;

[0062] Either the main beam is hollow or a second 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 second 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 rod.

[0063] Furthermore, the folding bicycle also includes a folding mechanism for the crank and the pedal center shaft, one end of the crank is connected to the fourth connecting member through a fourth connecting shaft, and the fourth connecting member is connected to the pedal center shaft.

[0064] Furthermore, the folding bicycle also includes a folding mechanism for the crank and the pedal center axis, a positioning portion is further provided at one end of the crank, the fourth connecting member is provided with a fifth positioning hole or a second positioning groove, and the positioning portion matches the fifth positioning hole or the second positioning groove;

[0065] Or one end of the crank is further provided with a fifth positioning hole or a second positioning groove, and the fourth connecting member is provided with a positioning portion, which matches the fifth positioning hole or the second positioning groove.

[0066] Further, the fourth connecting member is provided with a third protrusion, the third protrusion is provided with a ninth mounting hole, two fourth protrusions are provided at one end of the crank, 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 through a fourth connecting shaft, the front and rear side surfaces of the fourth protrusion are respectively provided with a positioning portion, and the fourth connecting member on both sides of the third protrusion is respectively provided with a fifth positioning hole;

[0067] The fifth positioning hole is located in the first inner concave portion of the fourth connecting member, the cross section of the first inner concave portion is arc-shaped, the cross sections of the tops of the two fourth protrusions are arc-shaped, and the two fourth protrusions are matched with the corresponding first inner concave portions respectively;

[0068] The other end of the crank is connected to the fifth connecting member, and the fifth connecting member is connected to the pedal through the fifth connecting shaft.

[0069] Further, the fourth 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 side surfaces of the sixth protrusion are respectively provided with two positioning portions, the two positioning portions on the same side surface are located at 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 through the fourth connecting shaft;

[0070] The fifth positioning hole is located below the eleventh mounting hole;

[0071] The cross section of the top of the fifth protrusion is arc-shaped, and two second inner concave parts are provided on the end surface of one end of the crank, and the cross section of the second inner concave parts is arc-shaped. The two second inner concave parts are respectively located on both sides of the sixth protrusion, and the two second inner concave parts are respectively matched with the corresponding fifth protrusions;

[0072] The other end of the crank is connected to the fifth connecting member, and the fifth connecting member is connected to the pedal through the fifth connecting shaft.

[0073] The fourth connecting member is provided with a second extension portion, the second extension portion is provided with a seventh positioning portion, the seventh positioning portion is provided with a seventh protrusion, the seventh protrusion and the second extension portion form a seventh slot, the crank is provided with a first positioning hole or a third positioning slot, and a movable third positioning pin, when the crank is unfolded, the seventh positioning portion is embedded in the first positioning hole or the third positioning slot, and one end of the third positioning pin matches the seventh slot.

[0074] Furthermore, a hollow channel is provided in the crank, and the third positioning pin moves in the hollow channel. A third elastic portion is also provided in the hollow channel corresponding to the other end of the third positioning pin. A through hole connected to the hollow channel is provided on the crank, and the push rod passes through the through hole to connect to the third positioning pin.

[0075] A protruding step portion is provided on the second extension portion near the seventh positioning portion, and the shape of the protruding step portion matches the shape of the first positioning hole or the third positioning groove; an inclined surface is provided on one side of the protruding step portion corresponding to one end of the third positioning pin;

[0076] and / or a magnetic positioning part is also provided on the crank; the fourth connecting member is connected to the pedal middle axis by a fixing bolt, and the distance between the magnetic positioning part and the fourth connecting axis is equal to the distance between the fixing bolt and the fourth connecting axis;

[0077] And / or the second extension is made of metal.

[0078] In view of the above technical features, the present invention has the following beneficial effects:

[0079] 1. A folding bicycle of the present invention can shorten 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. Thus, when the folding bicycle is folded by the first folding mechanism, the overall size of the folding bicycle will be reduced.

[0080] 2. A folding bicycle of the present invention realizes folding between the front fork and the upright (or the steering shaft) by providing a second folding mechanism for the front fork and the upright, so as to facilitate folding and storing the front wheel under the frame, thereby further reducing the size of the folded bicycle.

[0081] 3. The folding bicycle of the present invention improves the connection strength between the front fork and the upright pole by providing a first connection mechanism between the front fork and the upright pole, thereby improving the safety of the folding bicycle.

[0082] 4. A folding bicycle of the present invention has a folding pedal mechanism. When the folding bicycle is folded, the pedal can also adjust its direction and fold inward as much as possible, so that the size of the folded bicycle can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 This is a schematic diagram of the structure of a folding frame in specific embodiment 1. Figure 1 ;

[0084] Figure 2 This is a schematic diagram of the structure of a folding frame in specific embodiment 1. Figure 2 ;

[0085] Figure 3 This is a schematic diagram of the structure of a folding frame in specific embodiment 1. Figure 3 ;

[0086] Figure 4 is a structural schematic diagram of the shock absorbing mechanism in specific embodiment 1;

[0087] Figure 5 is a schematic structural diagram of a folding bicycle including a folding bicycle frame in specific embodiment 1 (in unfolded state);

[0088] Figure 6 yes Figure 5 A partial enlarged view of the rear fork (including the rear fork, showing the double chain drive design);

[0089] Figure 7 yes Figure 5 A partial enlarged view of the rear fork (excluding the rear fork, showing the double chain drive design);

[0090] Figure 8 is a structural schematic diagram of a folding bicycle including a folding frame in specific embodiment 1 (folded state, front view);

[0091] Fig. 9 is a schematic structural diagram of a folding bicycle including a folding frame in specific embodiment 1 (folded state, top view);

[0092] Fig.10 is a structural schematic diagram of a first connecting mechanism for a front fork and a vertical rod in a specific embodiment 7;

[0093] Fig.11 is a cross-sectional view of a first connecting mechanism for a front fork and a vertical rod in a specific embodiment 7;

[0094] Fig.12 It is a structural schematic diagram of a first connecting mechanism for a front fork and a vertical rod in a specific embodiment 7 (connecting the vertical rod and the front fork);

[0095] Fig.13 is a schematic structural diagram of a steering shaft in specific embodiment 7;

[0096] Fig.14 is a schematic structural diagram of the second connection block in specific embodiment 7;

[0097] Fig.15 is a schematic structural diagram of a limiting bolt in specific embodiment 8;

[0098] Fig.16is a schematic structural diagram of the retaining ring in specific embodiment 10;

[0099] Fig.17 is a schematic diagram of the structure of the bearing steel bowl in specific embodiment 10;

[0100] Fig.18 It is a structural schematic diagram of a first connecting mechanism for a front fork and a vertical rod in a specific embodiment 10 (including a corrugated washer);

[0101] Fig.19 It is a schematic diagram of the structure of the corrugated gasket in specific embodiment 10.

[0102] Fig. 20 Schematic diagram of the structure of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 Fig. 20 (Unfolded state, connecting the front wheels and the pole);

[0103] Fig.21 Schematic diagram of the structure of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 Fig.21 (Unfolded state, connecting the front wheels and the pole);

[0104] Fig. 22 Schematic diagram of the structure of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 Fig. 22 (Unfolded state, connecting the front wheels and the pole);

[0105] Fig.23 Schematic diagram of the structure of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 Fig.23 (expanded state);

[0106] Fig.24 Schematic diagram of the structure of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 Fig.24 (expanded state);

[0107] Fig.25 is a schematic structural diagram of the third connecting member in specific embodiment 11;

[0108] Fig.26 is a schematic structural diagram of the hook in specific embodiment 11;

[0109] Fig. 27 is a schematic structural diagram of the second position-limiting member in specific embodiment 11;

[0110] Fig.28 is a schematic structural diagram of the hook and the second limiting member before they are separated after the second limiting member is flipped over in specific embodiment 12;

[0111] Fig.29Schematic diagram of the structure of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 11 Fig. 27 (In the unfolded state, the front fork and the upright are connected by the steering shaft);

[0112] Fig.30 Schematic diagram of the structure of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 14 Fig.25 (folded state);

[0113] Fig.31 Schematic diagram of the structure of a second folding mechanism for a front fork and a vertical rod in a specific embodiment 15 Fig.26 (folded state);

[0114] Fig.32 is a schematic diagram of the structure of the folding bicycle including a second folding mechanism for the front fork and the upright in the specific embodiment 15 (folded state);

[0115] Fig.33 is a schematic structural diagram of the front fork in specific embodiment 13 (a second elastic portion is provided in the third mounting hole);

[0116] Fig.34 It is a three-dimensional representation of a first connecting member for a folding frame in Example 17. Fig.34 ;

[0117] Fig.35 It is a three-dimensional representation of the first connecting member for a folding frame in Example 17. Fig.35 ;

[0118] Fig.36 It is a three-dimensional representation of the first connecting member for a folding frame in Example 17. Fig.36 ;

[0119] Fig.37 This is a schematic diagram of the structure of a first folding mechanism for a folding vehicle in Example 18. Fig.34 (the seat tube body is connected to the main beam, and the first folding mechanism is in a folded state);

[0120] Fig.38 This is a schematic diagram of the structure of a first folding mechanism for a folding vehicle in Example 18. Fig.35 (the seat tube body is connected to the main beam, and the first folding mechanism is in a folded state);

[0121] Fig.39 is a schematic structural diagram of the main beam of the folding frame in Example 18;

[0122] Fig.40 is a structural schematic diagram of a first folding mechanism for a folding bicycle in Example 18 (the seat tube body is connected to the main beam, and the first folding mechanism is in an unfolded state);

[0123] Fig.41 It is a structural schematic diagram of a connection mechanism (steering shaft and main beam connection) for a folding bicycle frame and a vertical pole in Example 19.

[0124] Fig.42 is a top view of the first connecting member in Example 19;

[0125] Fig.43 is a bottom view of the first connecting member in Example 19;

[0126] Fig.44 is a three-dimensional representation of the fourth connecting member in specific embodiment 20 Figure 1 ;

[0127] Fig.45 is a three-dimensional representation of the fourth connecting member in specific embodiment 20 Figure 2 ;

[0128] Fig.46 It is a three-dimensional representation of the crank in specific embodiment 20. Figure 1 ;

[0129] Fig.47 It is a three-dimensional representation of the crank in specific embodiment 20. Figure 2 ;

[0130] Fig.48 is a structural schematic diagram of a pedal folding mechanism in specific embodiment 21 (folded state);

[0131] Fig.49 is a structural schematic diagram of a pedal folding mechanism in specific embodiment 21 (in unfolded state);

[0132] Fig.50 is the three-dimensional structure of the fourth connecting member in specific embodiment 22 Figure 1 ;

[0133] Fig.51 is the three-dimensional structure of the fourth connecting member in specific embodiment 22 Figure 2 ;

[0134] Fig.52 It is a three-dimensional representation of the crank in specific embodiment 22 Figure 1 ;

[0135] Fig.53 It is a three-dimensional representation of the crank in specific embodiment 22 Figure 2 ;

[0136] Fig.54 is a structural schematic diagram of a pedal folding mechanism in specific embodiment 23 (folded state);

[0137] Fig.55 is a structural schematic diagram of a folding bicycle in specific embodiment 23 (folded state);

[0138] Fig.56 is a structural schematic diagram of a pedal folding mechanism in specific embodiment 25 (in unfolded state);

[0139] Fig.57 The structure of a set of cranks and a fourth connecting member in the specific embodiment 25 is enlarged. Figure 1 ;

[0140] Fig.58 The structure of a set of cranks and a fourth connecting member in the specific embodiment 25 is enlarged. Figure 2 (hide crank);

[0141] Fig.59 The structure of a set of cranks and a fourth connecting member in the specific embodiment 25 is enlarged. Figure 3 (hide crank);

[0142] Fig.60 It is a schematic diagram of the structure of the crank in specific embodiment 25 (showing the hollow channel).

[0143] In the figure: 1000, folding frame; 1100, main beam; 1101, front beam; 1102, rear beam; 1103, bending portion; 1104, head pipe; 1105, headlight; 1106, front wheel; 1107, rear wheel; 1108, second mounting hole; 1109, first mounting groove; 1110, second mounting groove; 1200, seat tube body; 1201, first connecting portion; 1202, first extending portion; 1300, rear fork; 1301, left side arm; 1302 , right arm; 1303, crossbeam; 1304, pedal middle shaft hole; 1305, first connecting shaft; 1306, intermediate gear shaft hole; 1400, first folding mechanism; 1500, shock absorbing mechanism; 1501, spring; 1502, tendon; 1601, first sprocket; 1602, second sprocket; 1603, low gear chain plate; 1604, high gear chain plate; 1605, first chain; 1606, second chain; 1607, pedal crank; 1608, intermediate gear shaft.

[0144] 2000, a first connecting mechanism for the front fork and the upright; 2100, a second connecting member; 2110, a second connecting groove; 2111, a second internal thread; 2130, a first mounting hole; 2140, a countersunk hole; 2200, a steering shaft; 2210, a first connecting groove; 2211, a first internal thread; 2212, a first external thread; 2220, a first step; 2230, a first positioning groove; 2300, a first limiting bolt; 2310, a head of the first limiting bolt; 2313, a second external thread; 2400, a bearing steel bowl; 2410, a retaining ring; 2420, a top screw; 2500, a wave washer.

[0145] 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, fifth mounting hole; 3214, second stopper; 3220, second arm; 3222, second positioning pin; 3300, front fork; 3310, second connecting shaft; 3311, mounting hole A; 3320, third connecting shaft; 3330, third mounting hole; 3340, fourth positioning hole; 3350, first elastic part; 3360, second elastic part; 3370, fourth mounting hole; 3380, first stopper; 3400, hook; 3410, crossbar; 3411, slot; 3420, hollow part; 3430, elastic pad; 3440, mounting hole for connecting the fourth connecting shaft; 3500, vertical pole;

[0146] 4000, first connecting member; 4100, tenon; 4110, groove; 4120, eighth mounting hole; 4130, bolt; 4200, step portion; 4300, locking hole; 4400, hinge portion; 4500, mounting hole B;

[0147] 5000, folding pedal mechanism; 5100, fourth connecting member; 5110, fifth positioning hole; 5120, fourth connecting shaft; 5130, third protrusion; 5131, ninth mounting hole; 5140, fifth protrusion; 5141, eleventh mounting hole; 5150, thirteenth mounting hole; 5160, first inner recess; 5170, second inner recess; 5180, second extension; 5181, seventh positioning portion; 5182, seventh protrusion; 5183, seventh slot; 5184, protruding step portion; 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. first positioning hole; 5260. third positioning pin; 5261. inclined surface; 5262. push rod; 5270. third elastic portion; 5280. magnetic positioning portion; 5300. fifth connecting member; 5400. pedal; 5500. pedal center axis.

[0148] 6000. handle; 7000. third folding mechanism. DETAILED DESCRIPTION

[0149] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it 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 within the scope limited by the appended claims of the application equally.

[0150] See also Figures 1 to 9 , Specific embodiment 1, Specific embodiment 1, a folding frame 1000 of this embodiment 1 includes 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 middle shaft hole 1304, the rear fork 1300 is connected to the seat tube body 1200, and the pedal middle shaft hole 1304 is located in front of the seat tube body 1200. This design can move the rear fork 1300 forward as much as possible, effectively utilize the space under the frame from the first folding mechanism 1400 to the seat tube body 1200, and reduce the overall length of the frame (i.e. Figure 8 The length of the distance between the left and right ends of the folded folding bicycle from the perspective of the central main view) can effectively reduce the length of the folded frame (corresponding to the length direction) when the frame is folded, that is, the lateral space occupied by the folded frame is reduced, and the folding bicycle (including but not limited to folding bicycles or folding electric vehicles) using the folding frame 1000 is more convenient to store and carry after folding. The first folding mechanism 1400 is a prior art, as long as the main beam 1100 and the seat tube body 1200 can be folded, it will not be discussed in detail here. The pedal middle axis hole 1304 is used to install the pedal crank 1607 to connect the pedal.

[0151] Preferably, another specific embodiment 2, see Figure 2 The difference between the second embodiment and the first embodiment is that the rear fork 1300 and the seat tube body 1200 are axially connected, for example, through 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, so that the two ends of the rear fork can rotate around the first connecting shaft 1305 as the axis, and cooperate with the shock absorbing mechanism to play a vibration reduction role.

[0152] For example, the rear fork 1300 includes a left arm 1301 and a right arm 1302, and the front end of the left arm 1301 and the front end of the right arm 1302 are connected by a cross beam 1303. At this time, the left arm 1301 and the right arm 1302 are connected to the seat tube body 1200 through the first connecting shaft 1305, and the pedal middle shaft hole 1304 passes through the cross beam 1303, so that the rear fork 1300 is more firmly connected to the seat tube body 1200. At this time, the pedal middle shaft hole 1304 is located in front of the first connecting shaft 1305, and the distance between the front end of the rear fork 1300 (i.e., the front side of the cross beam 1303) and the axis of the first connecting shaft 1305 is the horizontal length distance that can be saved by the frame.

[0153] Preferably, the distance between the front end of the rear fork 1300 and the axis of the first connecting shaft 1305 is about one third to one quarter of the length of the rear fork 1300, or 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 middle shaft hole 1304, so that the first chainring is located in front of the seat tube body 1200, and the space in front of the seat tube body 1200 is effectively utilized. The length of the rear fork 1300 refers to the distance from the front end of the rear fork 1300 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.

[0154] Alternatively, the left arm 1301 and the right arm 1302 are respectively connected to the seat tube body 1200 via 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 rod into the seat tube body 1200.

[0155] 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 extending the length of the frame after folding in disguise, avoiding a significant reduction in the effect of reducing the overall length of the frame. Therefore, it is preferred that the projection of the front end of the rear fork 1300 in the vertical direction does not exceed the projection of the first folding mechanism 1400 in the vertical direction.

[0156] Preferably, another specific embodiment 3, see Figure 3The difference between this embodiment 3 and the above-mentioned embodiment is that a shock absorbing mechanism 1500 is provided between the front end of the rear fork 1300 and the seat tube body 1200, and the design that the rear fork 1300 and the seat tube body 1200 are connected through the first connecting shaft 1305 is used for shock absorbing or shock absorbing of 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 (used to connect the rear wheel 1107) and the axis of the first connecting shaft 1305. Through the principle of leverage, the shock absorbing mechanism 1500 plays a role in shock absorbing or shock absorbing the rear fork 1300, thereby improving the comfort of the folding bicycle.

[0157] The shock absorbing mechanism 1500 includes an elastic member, which may be a spring 1501 or a tendon 1502 or other new elastic materials, or a spring 1501 plus a tendon 1502, wherein 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 to achieve a stronger shock absorbing effect.

[0158] In the folding frame 1000 of the 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. Figure 4 Specifically, 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 fork 1300, and the two 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 attached Figures 1 to 3 ), or as an alternative, a 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 is connected to the first folding mechanism 1400 is the first connecting portion 1201, the first connecting portion 1201 is located above the front end of the rear fork 1300, and the two ends of the elastic member are respectively connected to the top of the front end of the rear fork 1300 and the first connecting portion 1201 of the seat tube body 1200. In these two designs, the shock absorbing mechanism 1500 is located in front of the seat tube body 1200, and like the front end of the rear fork 1300, the space below the frame from the first folding mechanism 1400 to the seat tube body 1200 is effectively utilized, and the volume of the shock absorbing mechanism 1500 is also minimized, occupying the least space.

[0159] 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 avoid the movement of the front end of the rear flat fork 1300, thereby achieving the shock absorption effect of the rear end of the rear flat fork 1300.

[0160] Preferably, another specific embodiment 4, see Figure 1 , the difference between this embodiment 4 and the above-mentioned embodiment is that: the main beam 1100 is provided with a curved portion 1103, 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 the rear beam portion 1102, the portion of the main beam 1100 close to the front end of the main beam 1100 is the 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. 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 curved portion 1103, so that the volume width of the folded folding vehicle (i.e. Fig. 9 From a bird's-eye view, the distance between the upper and lower ends of the folding bicycle is shorter after folding, and the space occupied by the folding bicycle is smaller, making it more convenient to store and carry.

[0161] For example, the rear beam 1102 forms an angle with the horizontal plane, and the front beam 1101 is arranged horizontally. Alternatively, as an alternative, 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, as long as the space below the curved portion 1103 can accommodate the folded front wheel 1106. Alternatively, as an alternative, the rear beam 1102 forms an angle with the horizontal plane, and the front beam 1101 is arranged slightly inclined, as long as the space below the curved portion 1103 can accommodate the folded front wheel 1106.

[0162] Preferably, another specific embodiment 5, see Figure 1 The difference between this embodiment 5 and the aforementioned embodiment is that: the rear fork 1300 is further provided with an intermediate gear shaft hole 1306 for connecting with 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 double-chain drive. Under the condition of ensuring the rotation speed of the rear wheel 1107, the length of the rear fork 1300 can be shortened, which helps to reduce the overall volume of the folding bicycle after folding. Under the condition of ensuring that the speed of the bicycle is not reduced, the double-chain drive also makes the rider more labor-saving.

[0163] Of course, the middle gear shaft hole 1306 can also be set on the right arm 1302 according to actual conditions.

[0164] For example, the pedal axle hole 1304 is connected to the first sprocket 1601 (also called a 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), and 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 variable speed conversion, and the high gear chainring 1604 rotates and then drives the second sprocket 1602 (also called a flywheel, corresponding to the rear wheel 1107) to rotate through the second chain 1606.

[0165] Preferably, another specific embodiment 6, see Figure 1 The difference between this embodiment 6 and the above-mentioned embodiment is that the left arm 1301, the right arm 1302 and the crossbeam 1303 are integrally formed, which also ensures that the position between the pedal middle shaft hole 1304 on the crossbeam 1303 and the middle gear shaft hole 1306 of the left arm 1301 is relatively fixed, and the chain will not become loose or even fall off due to the change of the position of the two, thereby improving the safety of chain use. Of course, the left arm 1301, the right arm 1302 and the crossbeam 1303 can also be formed by screw connection or welding.

[0166] 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 chain 1605 and the second chain 1606 corresponding to the first sprocket 1601 and the second sprocket 1602, thereby 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 may be a long strip, an oval, a rounded rectangle, etc.

[0167] 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 an additional mounting bracket. 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.

[0168] See also Figures 10 to 13, Specific embodiment 7, this embodiment 7 provides a first connecting mechanism 2000 for a front fork and a vertical rod, including a second connecting member 2100 for connecting the vertical rod 3500, a steering shaft 2200 and a tightening member for connecting the front fork 3300, the second connecting member 2100 and the steering shaft 2200 are threadedly connected; the second connecting member 2100 is provided with a first mounting hole 2130, and the steering shaft 2200 is provided with a first positioning groove 2230; after one end of the tightening member passes through the first mounting hole 2130, it is embedded in the first positioning groove 2230, so that the relative position between the second connecting member 2100 and the steering shaft 2200 is fixed, and "relative position fixed" 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 relative 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, reliable, more non-slip, and not easy to disengage, thereby ensuring that the connection between the handlebar stem and the front fork is more firm and more reliable, and the relative positions of the two will not change, thereby preventing the handlebar stem and the front fork from loosening.

[0169] Preferably, the pressing member and the first mounting hole 2130 are threadedly connected, and one end of the pressing member (such as a pressing screw or a positioning bolt) is inserted into the first positioning groove 2230 and then presses the steering shaft 2200. The pressing member has a circumferential constraint force on the steering shaft 2200 through the first positioning groove 2230, limiting the rotation of the steering shaft 2200. At the same time, because the pressing member is inserted into the first positioning groove 2230 and then presses the steering shaft 2200, the pressing member also has a radial pressure on the steering shaft 2200, which can increase the pressure strength 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 can also effectively prevent the second connecting member 2100 and the steering shaft 2200 from rotating relative to each other.

[0170] Preferably, an axial long strip first positioning groove 2230 is provided on the outer side of the steering shaft 2200. No matter 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 turns, the first mounting hole 2130 and the long strip first positioning groove 2230 can be aligned. After the two are aligned, after one end of the top member passes through the first mounting hole 2130, it can always be embedded in the first positioning groove 2230 (the height position of one end of the top member in the first positioning groove 2230 also changes accordingly), and the steering shaft 2200 is circumferentially positioned to prevent the second connecting member 2100 and the steering shaft 2200 from rotating relative to each other, that is, the long strip first positioning groove 2230 can well cope with the height change of one end of the top member.

[0171] Compared with the clamp connection method used in the existing front fork and the upright, the first connecting mechanism 2000 used for the front fork and the upright in this embodiment 7 is smaller in size. For example, the height of the first connecting mechanism 2000 used for the front fork 3300 and the upright 3500 is shorter. The first connecting mechanism 2000 used for the front fork 3300 and the upright 3500 in this embodiment 7 is threadedly connected between the steering shaft 2200 and the second connecting member 2100. The two are circumferentially limited and mutually tightened by a tightening member to fix the relative position between the two. A stable threaded connection can be formed with a thread height of 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 a folding bicycle or a folding electric vehicle) smaller, and the volume or size after folding will also be smaller.

[0172] See also Figures 10 to 15 , Specific embodiment 8, this embodiment 8 provides a first connection mechanism for a front fork and a vertical rod, and this embodiment 8 is different from embodiment 7 in that: the first connection mechanism 2000 also includes a first limiting bolt 2300, and the outer side of the first limiting bolt 2300 is provided with a second external thread 2313. A first connection groove 2210 is provided at one end (such as the top end) of the steering shaft 2200, and a first internal thread 2211 is provided on the inner side wall of the first connection groove 2210, and a first external thread 2212 is provided on the outer side of the end of the steering shaft 2200, and the first internal thread 2211 and the first external thread 2212 are in opposite directions.

[0173] 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 threads of the two correspond to each other, and a threaded connection between the second connecting member 2100 and the steering shaft 2200 is realized); the first limiting bolt 2300 is embedded in the first connecting groove 2210, and the second external thread 2313 matches the first internal thread 2211 (that is, the threads of the two correspond to each other, and a threaded connection between the first limiting bolt 2300 and the steering shaft 2200 is realized). 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, so that the connection between the second connecting member 2100 and the steering shaft 2200 is more firm and reliable, avoiding reverse rotation (i.e. rotation in the opposite direction to the locking direction, or in the loosening direction) between the second connecting member 2100 and the steering shaft 2200, and avoiding looseness between the second connecting member 2100 and the steering shaft 2200.

[0174] 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 achieve tightening of 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 achieve tightening of the two, the first internal thread 2211 is a reverse thread and the second external thread 2313 is a reverse thread), once the second connecting member 2100 and the steering shaft 2200 are connected by a forward thread, the first internal thread 2211 is a reverse thread and the second external thread 2313 is a reverse thread. Looseness occurs between them, that is, the second connecting member 2100 and the steering shaft 2200 rotate counterclockwise, and the first limiting bolt 2300 also rotates counterclockwise synchronously at this time, and the first limiting bolt 2300 and the steering shaft 2200 are tightened more and more, and the first limiting bolt 2300 is more and more non-rotatable, and the second connecting member 2100 is limited by the first limiting bolt 2300 and will not rotate either, 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.

[0175] 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 second external thread 2313 is a forward thread), which can also achieve the limiting effect of the first limiting bolt 2300 on the second connecting member 2100, and help the second connecting member 2100 and the steering shaft 2200 to achieve locking.

[0176] 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.

[0177] 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 face of one end (such as the top end) of the second connecting member 2100. Assuming that the jacking member slides out of the first positioning groove 2230, once the steering shaft 2200 and the second connecting member 2100 become loose, the second connecting member 2100 will inevitably move upwards compared to the steering shaft 2200. At this time, the head 2310 of the first limiting bolt abuts against the top end face of the second connecting member 2100, limiting the second connecting member 2100 from moving upwards, thereby limiting the second connecting member 2100 from rotating compared to the steering shaft 2200, that is, avoiding or reducing the possibility of loosening between the second connecting member 2100 and the steering shaft 2200. 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 end) of the second connecting member 2100 and the head 2310 of the first limiting bolt also increases continuously. 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. In turn, the first limiting bolt 2300 uses the friction force 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, and the second connecting member 2100 and the steering shaft 2200 are not easy to loosen or disengage, and the connection is firm and the anti-skid effect is good, 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 kept consistent, that is, the handlebar and the front wheel are at a vertical angle), avoiding the handlebar connected to the vertical rod 3500 and the front wheel from changing in angle or avoiding the relative position of the handlebar vertical rod 3500 and the front fork 3300 from being inaccurate, which is easy to cause the direction deviation of the handlebar or the front wheel when riding. This design can be said to be based on Example 7, adding a safety insurance, which effectively prevents the second connecting member 2100 and the steering shaft 2200 from loosening.

[0178] 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 (such as 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 (such as the head 2310 of the first limiting bolt), so that the friction between the second connecting member 2100 and the head 2310 of the first limiting bolt can be increased, and the head 2310 of the first limiting bolt is embedded in the countersunk hole 2140, and the appearance is also more beautiful.

[0179] See also Figure 11 to Figure 12 , specific embodiment 9, this embodiment 9 provides a first 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 second 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, so as to play the locking and limiting role of the first limiting bolt 2300 on the second connecting member 2100.

[0180] The thread depth of the second 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 second external thread 2313. Even if the second connecting member 2100 and the steering shaft 2200 become loose or even detached, the second 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 safety guarantee for the connection between the upright 3500 and the front fork 3300, or provide a third insurance for the safe riding of the folding bicycle.

[0181] 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, while the end face of the steering shaft 2200 is not in contact with 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, so as to avoid affecting the locking effect of the first limiting bolt on the second connecting member 2100.

[0182] See also Figures 10 to 19, Specific embodiment 10, this embodiment 10 provides a first connection mechanism for a front fork and a vertical rod, and this embodiment 10 is different from the previous embodiments in that: a bearing steel bowl 2400 is installed on the steering shaft 2200, and there is a gap between the bearing steel bowl 2400 and the second connecting member 2100, and an elastic member is arranged in the gap. The elastic member can be used to fill the space of the gap, especially when the second connecting member 2100 and the steering shaft 2200 are adjusted in the axial direction, thereby affecting the size of the gap, at this time, the role of the elastic member in filling the gap is more obvious, and the elastic member can also be used to press the bearing steel bowl 2400, so that the bearing steel bowl 2400 can be stably connected to a fixed position on the outer side of the steering shaft 2200, to prevent the bearing steel bowl 2400 from sliding axially.

[0183] For example, a first step portion 2220 is provided on the outer side surface of the steering shaft 2200, and the first 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 first step portion 2220 (that is, the bearing steel bowl 2400 is installed on the first step portion 222), or the bearing in the bearing steel bowl 2400 is connected to the steering shaft 2200 by an interference fit. 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.

[0184] Preferably, the elastic member is a corrugated washer 2500, which has a small size and good elasticity and can wrap around the steering shaft 2200 to provide uniform elastic force, so that the force (ie, elastic force) pressing on the bearing steel bowl 2400 is more uniform.

[0185] 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 corrugated washer 2500 presses the retaining ring 2410 and the bearing steel bowl 2400 together.

[0186] In addition, while the elastic member compresses the bearing steel bowl 2400, the elastic member 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 in the loosening direction), and help improve the firmness and reliability of the connection between the second connecting member 2100 and the steering shaft 2200.

[0187] See also Figures 20 to 27 , Fig.29, Specific embodiment 11, this embodiment 11 provides a second folding mechanism for a front fork and a vertical pole, the second folding mechanism includes a third connecting member 3100 for connecting the vertical pole 3500, and a front fork 3300, the third connecting member 3100 and the front fork 3300 are connected through a second connecting shaft 3310, for example, the front fork 3300 is provided with a mounting hole A3311, and the second connecting shaft 3310 is installed in the mounting hole A3311. The third connecting member 3100 and the front fork 3300 can rotate or flip relative to each other along the second connecting shaft 3310 to achieve an unfolded state and a folded state between the third connecting member 3100 and the front fork 3300.

[0188] 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 through the third 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. When the third connecting member 3100 and the front fork 3300 are in the unfolded state, the first protrusion 3211 and the slot 3411 cooperate, that is, the first protrusion 3211 is embedded in the slot 3411, the first locking member 3200 and the hook 3400 are in a locked state, and the relative position between the third connecting member 3100 and the front fork 3300 is fixed. At this time, the third connecting member 3100 and the front fork 3300 in the unfolded state are safer and more reliable to use. When the third connecting member 3100 and the front fork 3300 need to be changed into a folding state, for example, by rotating the first locking member 3200 so that the first protrusion 3211 and the slot 3411 are separated, the first 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 second 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 backwards, 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.

[0189] Preferably, the top of the first protrusion 3211 is an arc surface, so that after the first locking member 3200 is turned over, the first locking member 3200 and the hook 3400 can switch between the state (locked state or unlocked state) more conveniently. Specifically, the first protrusion 3211 of the first locking member 3200 matches the slot 3411 of the hook 3400 (that is, the first protrusion 3211 is embedded in the slot 3411), so that the first locking member 3200 and the hook 3400 are locked. After the first locking member 3200 is rotated, the direction of the first protrusion 3211 is changed, so that the first protrusion 3211 and the slot 3411 are staggered, so that the first locking member 3200 and the hook 3400 are separated, and the unlocked state between the first locking member 3200 and the hook 3400 is realized. The locked state and the unlocked state can be switched by rotating the first locking member 3200, which is more convenient to use.

[0190] Preferably, an elastic pad 3430 is provided in the slot 3411, and the elastic pad 3430 is used to protect the hook 3400 and the first 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 strength between the first protrusion 3211 and the slot 3411.

[0191] The bottom of the elastic pad 3430 is an arc surface, corresponding to the arc surface of the first protrusion 3211. When the first locking member 3200 is locked with the hook 3400, the two arc surfaces fit each other. 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.

[0192] In addition, the vertical rod 3500 and the third connecting member 3100 can also be indirectly connected through the steering shaft 2200, see Fig.29 The steering shaft 2200 is used to be connected or indirectly connected to the folding frame 1000 of the folding bicycle.

[0193] See also Figures 20 to 28, specific embodiment 12, this embodiment 12 provides a second folding mechanism for a front fork and a vertical rod, and this embodiment 12 is different from the previous embodiments in that: the first locking member 3200 is also 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 arranged at the bottom of the cross bar 3410. When the first locking member 3200 and the hook 3400 need to be locked, the first 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 rotated to a locking angle (for example, when the first protrusion 3211 faces 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 first locking member 3200 can be realized. The locking state between the third connecting member 3100 and the hook 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 front fork 3300 is firmly connected with the vertical rod 3500, 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 the first locking member 3200 and the hook 3400 from accidentally separating, ensuring that the locking state of the first 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.

[0194] When the first locking member 3200 and the hook 3400 need to be unlocked, the first locking member 3200 only needs to be rotated (for example, in the reverse direction). The first 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 away from the locking angle (for example, when the first protrusion 3211 changes from facing upward to facing forward), the first protrusion 3211 and the slot 3411 are staggered, and the first protrusion 3211 slides out of the slot 3411. At this time, the first protrusion 3211 is opposite to the locking member 3200. The card slot 3411 has no locking effect, and the card hook 3400 can be rotated to separate the card hook 3400 and the first locking member 3200, so as to realize the unlocking state between the first locking member 3200 and the card hook 3400, and indirectly realize the unlocking between the third connecting member 3100 and the front fork 3300. At this time, the front fork 3300 and the front wheel 1106 can be rotated along the second connecting shaft 3310 to realize 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 side of the cross bar 3410 (see Fig.28 ), at this time, the second limiting member 3214 does not limit the cross bar 3410, and the hook 3400 can be flipped out of the first locking member 3200 to prepare for the folding of the front fork 3300.

[0195] Preferably, a fifth 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 fifth mounting hole 3213. The threaded connection design between the fifth mounting hole 3213 and the second limiting bolt is convenient for assembling the fifth mounting hole 3213 and the second limiting member 3214, and is also convenient for adjusting the height of the second limiting bolt relative to the cross bar 3410 and the first protrusion.

[0196] See also Fig. 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 embodiments in that: the first locking member 3200 is an L-shaped locking wrench, and the locking wrench includes two first arms 3210 and second arms 3220 at right angles, and the first arm 3210 is rotatably connected to the third connecting member 3100, and the first protrusion 3211 and the second protrusion 3212 are arranged on the first arm 3210, and the first protrusion 3211 and the second limiting member 3214 have the same orientation, such as keeping synchronously upward, synchronously realizing the clamping connection between the first protrusion 3211 and the clamping groove 3411 and the limiting of the cross bar 3410 by the second limiting member 3214, and the first protrusion 3211 and the second limiting member 3214 are synchronously flipped to realize the synchronous release of the above-mentioned clamping and limiting states. Specifically, when the first arm 3 210 rotates so that the first protrusion 3211 and the slot 3411 are engaged with each other, and when the third connecting member 3100 and the front fork 3300 are in a locked state, the second limiting member 3214 is located in front of the cross bar 3410, and the second limiting 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 limiting member 3214 flip in the hollow portion 3420, and the second limiting member 3214 moves to the oblique lower part of the cross bar 3410. The second limiting member 3214 cannot limit the cross bar 3410, and the hook 3400 can flip freely, so that the hook 3400 and the first arm 3210 of the locking wrench are separated, that is, the unlocked state between the third connecting member 3100 and the front fork 3300 is achieved.

[0197] The top of the second limiting member 3214 is higher than the top of the first protruding portion 3211 , so as to better effectively limit the cross bar 3410 .

[0198] 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 the locked state.

[0199] 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 first 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 first locking member 3200, thereby preventing the first locking member 3200 from rotating and ensuring that the locking state of the first 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 first 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 two mounting holes (i.e., mounting holes A3311) of the third connecting member 3100, and the second protrusion 3212 and the second limit member 3214 are located between the two mounting holes A3311. In this way, the installation and rotation of the first arm 3210 are more stable.

[0200] See also Fig.30 , specific embodiment 14, this embodiment 14 provides a second folding mechanism for a front fork and a vertical rod. The difference between this embodiment 14 and the previous embodiments is that: the front fork 3300 is also 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 first 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, avoiding the hook 3400 from rotating and shaking and causing damage to the hook 3400, and also helping the hook 3400 to self-reset, that is, the hook 3400 is quickly locked with the first protrusion 3211 of the first locking member 3200 under the action of the first elastic portion 3350. When the first locking member 3200 and the hook 3400 are locked, the first elastic portion 3350 also provides a certain fastening force between the first locking member 3200 and the hook 3400, ensuring that the locking state of the first locking member 3200 and the hook 3400 is more stable.

[0201] See also Figure 30 to Figure 32, Specific embodiment 15, this embodiment 15 provides a second folding mechanism for the front fork and the upright pole, and this embodiment 15 is different from the previous embodiment 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, and 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, so as to fix the front fork 3300 and the front wheel 1106 in the storage state, and make the structure of the folded folding bicycle more stable and safer while reducing the size of the folded folding bicycle.

[0202] See also Fig.33 , specific embodiment 16, this embodiment 16 provides a second folding mechanism for a front fork and a vertical rod. The difference between this embodiment 16 and the previous embodiment is that: the front fork 3300 is provided with a third mounting hole 3330, and the third connecting shaft 3320 is located in the third mounting hole 3330. For example, a mounting hole 3440 for connecting the third connecting shaft 3320 is provided at the bottom of the hook 3400, and the third connecting shaft 3320 is located in the mounting hole, so that the hook 3400 can rotate along the third connecting shaft 3320 to achieve a locked state or an unlocked state between the hook 3400 and the first locking member 3200.

[0203] The third mounting hole 3330 is a strip-shaped hole. A second elastic portion 3360 (such as a second spring or an elastic portion made of other elastic materials) is provided at the inner bottom of the third mounting hole 3330. The top of the second elastic portion 3360 is connected to the third connecting shaft 3320. A fourth mounting hole 3370 is provided on the top of the front fork 3300. The fourth mounting hole 3370 is connected to the third mounting hole 3330. The first limiting member 3380 is connected to the fourth mounting hole 3370. The first limiting member 3380 and the second elastic portion 3360 act on the third connecting shaft 3320 together to adjust the position of the third connecting shaft 3320 in the third mounting hole 3330. See Fig.33 The first limiting member 3380 (such as a bolt or a top screw) and the second elastic portion 3360 act together on the third connecting shaft 3320 to adjust the position of the third connecting shaft 3320 in the third mounting hole 3330. For example, when the hook 3400 and the first protrusion 3211 of the first locking member 3200 are loose, the first limiting member 3380 can be used to move the third connecting shaft 3320 downward in the third mounting hole 3330 (i.e., the strip hole), so that the hook 3400 and the first locking member 3200 in the locked state are tightened, the fit is tighter, the use effect is better, and it is safer.

[0204] See also Figures 34 to 38, Specific embodiment 17, this embodiment 17 provides a first connecting member for a folding frame, the folding frame 1000 includes a main beam 1100, and one end of the first connecting member 4000 is provided with a tenon 4100 for embedding into one end of the main beam 1100. The tenon 4100 of the first connecting member 4000 is embedded in the main beam 1100 of the folding frame 1000, and there is an overlapping portion between the first connecting member 4000 and the main beam 1100, which helps to improve the connection strength between the first connecting member 4000 and the main beam 1100. The folding vehicle used by the folding frame 1000 includes but is not limited to a folding bicycle and a folding electric vehicle.

[0205] 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 adhered to each other, which can also improve the connection strength between the first connecting member 4000 and the main beam 1100.

[0206] 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, so that the connection between the first connecting member 4000 and the main beam 1100 is more firmly established.

[0207] The outer side wall of the tenon 4100 is further provided with an eighth mounting hole 4120, and the main beam 1100 is provided with a second mounting hole 1108. The eighth mounting hole 4120 and the second mounting hole 1108 are connected by bolts 4130 to realize the connection between the tenon 4100 and the main beam 1100.

[0208] Preferably, the groove 4110 is connected to the eighth mounting hole 4120. When the tenon 4100 is embedded in one end of the main beam 1100, the eighth mounting hole 4120 is aligned with the second mounting hole 1108. At this time, adhesive can be injected into the groove 4110 through the second mounting hole 1108. The adhesive gradually flows in the groove 4110 until a circle of the groove 4110 is filled with adhesive. After the adhesive solidifies, the outer wall of the tenon 4100 is bonded 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 maximum extent.

[0209] Preferably, a step portion 4200 is provided at the bottom of the tenon 4100 , and the step portion 4200 is welded to the end of one end of the main beam 1100 to increase the connection strength between the first connecting member 4000 and the main beam 1100 .

[0210] 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 eighth mounting hole 4120 is aligned with the second mounting hole 1108. The 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 second 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 by the adhesive. This is the second connection. Finally, the eighth mounting hole 4120 and the second mounting hole 1108 are connected and fixed by bolts 4130 to achieve the connection between the tenon 4100 and the main beam 1100. This is the third connection. In this way, the main beam 1100 (i.e., the frame 1000) and the first connecting member 4000 are more firmly connected, greatly improving the connection strength between the two.

[0211] See also Figures 37 to 40 , Specific embodiment 18, this embodiment 18 provides a first folding mechanism for a folding bicycle, including a first connecting member for a folding frame in the above embodiment 17, the main beam 1100 is hollow or a first installation groove 1109 is provided at one end of the main beam 1100, 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 first 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 (or realize the triple connection between the first connecting member 4000 and the main beam 1100); the other end of the first connecting member 4000 is hinged to the seat tube body 1200, and the hinged part of the two is the hinged part 4400. The seat tube body 1200 is used to connect the rear fork and the seat cushion.

[0212] 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 between the seat tube body 1200 and the first connecting member 4000 when the first folding mechanism is in the unfolded state.

[0213] Preferably, the shape of the tenon 4100 matches the internal shape of one end of the main beam 1100 or the internal shape of the first mounting groove 1109 of the main beam 1100. For example, if the shape of the tenon 4100 is square, the internal shape of one end of the main beam 1100 or the internal shape of the first mounting groove 1109 of the main beam 1100 is square, and the main beam 1100 and the tenon 4100 will not rotate in the circumferential direction, ensuring that the connection between the two is more secure and stable. Of course, the shape of the tenon 4100 and the internal shape of one end of the main beam 1100 or the internal shape of the first mounting groove 1109 of the main beam 1100 can also be other shapes, as long as the two can match, avoid circumferential rotation between the two, and ensure that the connection between the two is more secure and stable.

[0214] 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 are rotated 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.

[0215] See also Figure 41 to Figure 43 , Specific embodiment 19, this embodiment 19 provides a connection mechanism for a folding bicycle frame and a vertical pole, including a first connection piece for a folding bicycle frame in the above embodiment 17, the main beam 1100 is hollow or the other end of the main beam 1100 is provided with a second installation groove 1110, the tenon 4100 at one end of the first connection piece 4000 is embedded in the other end of the main beam 1100 or embedded in the second installation groove 1110 at one end of the main beam 1100, so as to realize the connection between the first connection piece 4000 and the main beam 1100;

[0216] The vertical rod 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 mounting hole B4500 for mounting the steering shaft 2200. The steering shaft 2200 is sleeved in the mounting hole B4500, 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.

[0217] See also Figures 44 to 49 , Specific embodiment 20, this embodiment 1 provides a folding mechanism for a crank and a pedal center shaft, including a crank 5200, one end of the crank 5200 is connected to a fourth connecting member 5100 via a fourth connecting shaft 5120, the fourth connecting member 5100 is connected to the pedal center shaft 5500, for example, the fourth connecting member 5100 is connected to the pedal center shaft 5500 via a thirteenth mounting hole 5150, and the pedal center shaft 5500 is connected to the rear fork 1300.

[0218] A positioning portion 5210 is also provided at one end of the crank 5200, and the fourth connecting member 5100 is provided with a fifth positioning hole 5110 or a second positioning groove. The positioning portion 5210 matches the fifth positioning hole 5110 or the second positioning groove, and helps the crank 5200 to be positioned after being folded along the fourth connecting axis 5120 and the pedal center axis 5500. For example, folding 180° can realize the positioning of the crank 5200 and the fourth connecting member 5100 at two angles. When the folding bicycle is folded, the two cranks 5200 can be both facing downward (for example, the two cranks 5200 are in the same direction and overlapped, and the two cranks 5200 are folded at both ends of the pedal center axis 5500). That is, the shape of the entire pedal mechanism can be adjusted by adjusting the direction of the crank 5200, and the size of the folding bicycle after folding is further reduced in coordination with the overall folding of the folding bicycle, so as to facilitate the storage of the pedal 5400. The size of the folding bicycle after folding refers to the three-dimensional volume formed by the length, width and height of the outermost part of the folding bicycle after folding.

[0219] As an optional alternative, a fifth positioning hole 5110 or a second positioning groove may be further provided at one end of the crank 5200, and the fourth 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 second positioning groove, so as to achieve the positioning effect after the crank 5200 is folded along the fourth connecting axis 5120.

[0220] The other end of the crank 5200 is connected to the fifth connecting member 5300, and the fifth connecting member 5300 is connected to the foot pedal 5400 via a fifth connecting axis (not shown in the drawings). The foot pedal 5400 can be folded along the fifth 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.

[0221] The connection structures of the left and right cranks 5200, the pedal center shaft 5500 and the pedal 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, which reduces the occupied space and is convenient for storage.

[0222] Specifically, the fourth 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, which is convenient for the crank 5200 to flip. 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 fourth connecting shaft 5120. The front and rear sides of the fourth protrusion 5230 are respectively provided with a positioning portion 5210. For example, each fourth protrusion 5230 A positioning portion 5210 (such as a protruding positioning point A and a protruding positioning point B) is provided at the front and back, and a fifth positioning hole 5110 (such as two positioning holes) is provided on the fourth connecting member 5100 on both sides of the third protruding portion 5130, so that the crank 5200 can be positioned forward and backward along the fourth connecting axis 5120. In this scheme 1, the fourth connecting member 5100 is a male member, and the two fourth protruding portions 5230 at one end of the crank 5200 form a female member. The fourth 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 foldably connected with the fourth connecting axis 5120.

[0223] The fifth positioning hole 5110 is located in the first recessed portion 5160 of the fourth connecting member 5100. The cross-section of the first recessed portion 5160 is arc-shaped. The cross-section of the top of the two fourth protrusions 5230 is arc-shaped. The two fourth protrusions 5230 are matched with the corresponding first recessed portions 5160, respectively. That is, when one end of the crank 5200 rotates along the fourth 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, namely, 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).

[0224] See also Figures 44 to 49 , Specific embodiment 21, this embodiment 21 provides a pedal folding mechanism, this embodiment 21 includes a folding mechanism for a crank and a pedal middle axis of embodiment 20, the other end of the crank 5200 is connected to the fifth connecting member 5300, and the fifth connecting member 5300 is connected to the pedal 5400 through the fifth connecting shaft. When the folding bicycle is folded and stored, the pedal can be rotated through the fifth connecting shaft and stored inside the folding bicycle, so as to reduce the size of the folded folding bicycle as much as possible.

[0225] See also Figure 50 to Figure 53, Specific embodiment 22, this embodiment 22 provides a folding mechanism for a crank and a pedal middle axis, and the difference between this embodiment 22 and embodiment 20 is that: the fourth 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, and the sixth protrusion 5240 is provided with a twelfth mounting hole 5241, and two positioning portions 5210 are respectively provided on both sides of the sixth protrusion 5240, and the two positioning portions 5210 on the same side are located on both sides of the twelfth mounting hole 5241, 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 by the fourth connecting shaft 5120, and at this time, the fifth positioning hole 5110 and the positioning portion 5210 can achieve two positioning effects before and after the crank 5200 is folded. In this solution 2, the fourth connecting member 5100 is a female member, and one end of the crank 5200 is a male member.

[0226] The cross-section of the top of the fifth protrusion 5140 is arc-shaped, and two second inner recesses 5170 are provided on the end surface of one end of the crank 5200. The cross-section of the second inner recess 5170 is arc-shaped. The two second inner recesses 5170 are respectively located on both sides of the sixth protrusion 5240, and the two second 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 fourth connecting axis 5120, the top of the fifth protrusion 5140 rotates in the corresponding second inner recess 5170, so that the two groups of positioning parts 5210 provided on both sides of the sixth protrusion 5240 are in corresponding positions, and 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, so as to reduce the size of the folding bicycle after folding).

[0227] 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.

[0228] See also Figure 50 to Figure 55 , Specific embodiment 23, this embodiment 23 provides a pedal folding mechanism, this embodiment 23 includes a folding mechanism for a crank and a pedal middle axis of embodiment 21, the other end of the crank 5200 is connected to the fifth connecting member 5300, and the fifth connecting member 5300 is connected to the pedal 5400 through the fifth connecting shaft. When the folding bicycle is folded and stored, the pedal can be rotated through the fifth connecting shaft and stored inside the folding bicycle, so as to minimize the size of the folded folding bicycle, see Fig.54, 55 .

[0229] See also Figure 5 , Figure 8 , specific embodiment 24, this embodiment 24 provides a folding bicycle, and this embodiment 24 is different from the previous embodiment in that: the folding bicycle also includes a second connecting member 2100 and the vertical pole 3500 that are foldably connected through a connecting shaft, for example, the vertical pole and the second connecting member 2100 are unfolded and fixed and folded and stored through a third folding mechanism 7000, and the third folding mechanism 7000 belongs to the prior art, for example, it includes a connecting shaft for realizing mutual rotation between the second connecting member 2100 and the vertical pole 3500, and a locking hole and a locking pin for fixing the relative position of the second connecting member 2100 and the vertical pole 3500 when the second connecting member 2100 and the vertical pole 3500 are unfolded.

[0230] The folding bicycle also includes a foldable handle 6000. The folding of the handle 6000 also belongs to the prior art. 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, a locking hole and a 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, which is convenient for riding.

[0231] Such designs are all intended to ensure that the size of the folding bicycle is minimized after folding, without affecting the folding effects of other embodiments.

[0232] See also Figures 56 to 60, Specific embodiment 25, this embodiment 25 provides a folding mechanism for a crank and a pedal middle shaft, and this embodiment 25 is different from the previous embodiment in that: the fourth connecting member 5100 is provided with a second extension portion 5180, the second extension portion 5180 is provided with a seventh positioning portion 5181, the seventh positioning portion 5181 is provided with a seventh protrusion 5182, the seventh protrusion 5182 and the second extension portion 5180 form a seventh slot 5183, the crank 5200 is provided with a first positioning hole 5252 (or a third positioning slot) and a movable third positioning pin 5260, when the crank 5200 is unfolded, the seventh positioning portion 5181 is embedded in the first positioning hole 5252 (or the third positioning slot), and the third positioning pin 5260 is movable. One end of the positioning pin 5260 matches the seventh slot 5183, that is, when one end of the third positioning pin 5260 is embedded in the seventh slot 5183, it is used for positioning between the crank 5200 and the second extension portion 5180 (that is, to achieve the positioning effect after the crank 5200 is folded along the fourth connecting axis 5120, such as keeping the crank 5200 and the second extension portion 5180 side by side and overlapping, and the seventh positioning portion 5181 is embedded in the first positioning hole 5252), limiting the crank 5200 from flipping along the fourth connecting axis 5120, avoiding separation between the crank 5200 and the second extension portion 5180, avoiding affecting the user's stepping on the corresponding pedal 5400, and avoiding riding risks.

[0233] When the crank 5200 is extended (see Figure 56 to Figure 58 ), the crank 5200 and the second extension portion 5180 overlap side by side, the seventh positioning portion 5181 is embedded in the first positioning hole 5252 (or the third positioning groove), which is the first fixed connection point, and one end of the crank 5200 is connected to the fourth connecting member 5100 through the fourth connecting shaft 5120, which is the second fixed connection point, to achieve two-point fixation between the crank 5200 and the fourth connecting member 5100, and the connection between the crank 5200 and the fourth connecting member 5100 is more stable and more secure. When the user steps on the pedal 5400 to flip it, the crank 5200 drives the fourth connecting member 5100 and its second extension portion 5180 to rotate accordingly more stably and securely.

[0234] By moving the third positioning pin 5260, one end of the third positioning pin 5260 is disengaged from the seventh slot 5183, so that the crank 5200 can be folded up, that is, the crank 5200 is separated from the second extension portion 5180. After the crank 5200 is turned 180° along the fourth connecting axis 5120, the two cranks 5200 are in the same direction (that is, the cranks 5200 are folded), which is convenient for folding the folding bicycle. For example, the two cranks 5200 can be directed downward (that is, the two cranks 5200 are in the same direction and overlap, and the two cranks 5200 are folded at both ends of the pedal center axis 5500). That is, the shape of the entire pedal mechanism can be adjusted by adjusting the direction of the crank 5200, and the size of the folding bicycle after folding is further reduced to facilitate the storage of the pedal 5400. The size of the folding bicycle after folding refers to the three-dimensional volume formed by the length, width and height of the outermost part of the folding bicycle after folding.

[0235] The first positioning hole 5252 may also be replaced by the third 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 second extension portion 5180 .

[0236] The seventh positioning portion 5181 can be a bolt, which is threadedly connected to the second extending portion 5180 , and a circle of groove is formed between the head of the bolt and the second extending portion 5180 , and the circle of groove is the seventh slot 5183 .

[0237] A hollow channel 5250 is provided in the crank 5200, and a third positioning pin 5260 moves in the hollow channel 5250. A third elastic portion 5270 is also provided in the hollow channel 5250 corresponding to the other end of the third positioning pin 5260. The third positioning pin 5260 and the third elastic portion 5270 are both arranged in the hollow channel 5250 in the crank 5200, which is more beautiful as a whole.

[0238] In addition, the third elastic portion 5270 can be a compression spring or other elastic member, one end of the compression spring is abutted against or connected to the other end of the third positioning pin 5260, and the other end of the compression spring is abutted against or connected to one end of the hollow channel 5250, and the compression spring provides pressure or elastic force for the third positioning pin 5260, so that the third 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 connected to the hollow channel 5250, and the push rod 5262 passes through the through hole 5251 to connect to the third positioning pin 5260, so that the user can use the push rod 5262 to drive the third 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 third positioning pin 5260 into the seventh slot 5183 or disengaging one end of the third positioning pin 5260 from the seventh slot 5183.

[0239] A protruding step portion 5184 is provided on the second extension portion 5180 near the seventh positioning portion 5181. The shape of the protruding step portion 5184 matches the shape of the first positioning hole 5252 (or the third positioning groove). When the protruding step portion 5184 is embedded in the first positioning hole 5252 (or the third positioning groove), the upper and lower outer edges of the protruding step portion 5184 abut against the upper and lower inner walls of the first positioning hole 5252 to avoid a gap, or the outer edges of the protruding step portion 5184 abut against the inner wall of the first positioning hole 5252 to avoid a gap. This can prevent the crank 5200 and the second extension portion 5180 from shaking, especially when the user steps on the pedal 5400 to drive the crank 5200, the second extension portion 5180 and the fourth connecting member 5100 to rotate, the crank 5200 and the second extension portion 5180 will not shake.

[0240] 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 second extension portion 5180 , and the upper and lower inner walls of the first positioning hole 5252 refer to the two inner walls of the first positioning hole 5252 close to both sides of the crank 5200 .

[0241] An inclined surface 5261 is provided on one side of the protruding step portion 5184 at one end of the third positioning pin 5260. For example, an inclined surface 5261 is provided at the bottom of one end of the third positioning pin 5260. When one end of the third positioning pin 5260 is inserted into the seventh slot 5183, the inclined surface 5261 can help one end of the third positioning pin 5260 to be inserted into the seventh slot 5183 more quickly and accurately.

[0242] A magnetic positioning portion 5280 (such as a magnet, a magnet or a magnetic member made of magnetic material) is also provided on the crank 5200, and the fourth connecting member 5100 is connected to the pedal center axis 5500 by a fixing bolt 5185, and the distance between the magnetic positioning portion 5280 and the fourth connecting axis 5120 is equal to the distance between the fixing bolt 5185 and the fourth connecting axis 5120; when the crank 5200 is folded, the magnetic positioning portion 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 portion 5280 uses magnetic force to tightly absorb the pedal center axis 5500, so that the folded crank 5200 and the pedal center axis 5500 are mutually positioned, thereby indirectly realizing the mutual positioning between the folded crank 5200 and the fourth connecting member 5100, and preventing the crank 5200 from moving after folding.

[0243] When the second extension portion 5180 is made of metal and the crank 5200 is unfolded, the crank 5200 in the unfolded state and the second extension portion 5180 overlap side by side, and the magnetic positioning portion 5280 can also absorb the second extension portion 5180 to help improve the positioning effect between the crank 5200 in the unfolded state and the second extension portion 5180.

[0244] 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 specification 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, characterized in that: 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 shaft hole (1304); the rear fork (1300) is connected to the seat tube body (1200); and the pedal middle shaft hole (1304) is located in front of the seat tube body (1200); The folding bicycle further comprises a first connection mechanism (2000) for the front fork and the upright pole, the first connection mechanism (2000) comprising a second connection member (2100) for connecting the upright pole (3500) and a steering shaft (2200) for connecting the front fork (3300), the second connection member (2100) and the steering shaft (2200) being threadedly connected; The first connection mechanism (2000) further comprises a first limiting bolt (2300), and the outer side surface of the first limiting bolt (2300) is provided with a second 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 second 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).

2. A folding bicycle according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 inclinedly.

6. A folding bicycle according to claim 5, characterized in that: 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 quarter to one third 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, characterized in that: The first connection mechanism (2000) comprises a tightening member, the second connection member (2100) is provided with a first mounting hole (2130), and the steering shaft (2200) is provided with a first positioning groove (2230); After one end of the tightening member passes through the first mounting hole (2130), it is embedded in the first 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, characterized in that: The first 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 exists between the bearing steel bowl (2400) and the second connecting member (2100), and an elastic member is arranged in the gap.

9. A folding bicycle according to claim 8, characterized in that: The thread depth of the first internal thread (2211) is greater than the thread depth of the second external thread (2313); The thread depth of the second 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 second external thread (2313); The thread depth of the second internal thread (2111) is greater than the thread depth of the first external thread (2212).

10. A folding bicycle according to claim 9, characterized in that: The first internal thread (2211) is a reverse thread, the first external thread (2212) is a forward thread, the second 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 second 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 first 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).

11. A folding bicycle according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8 or 9 or 10, characterized in that: 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 second 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 third 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).

12. A folding bicycle according to claim 11, characterized in that: 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 third mounting hole (3330), and the third connecting shaft (3320) is located in the third mounting hole (3330); the third mounting hole (3330) is a strip hole, and a second elastic part (3360) is provided at the inner bottom of the third mounting hole (3330), and the top of the second elastic part (3360) is connected to the third connecting shaft (3320); a fourth mounting hole (3370) is provided at the top of the front fork (3300), and the fourth mounting hole (3370) is connected to the third mounting hole (3330), and the first limiting member (3380) is connected to the fourth mounting hole (3370), and the first limiting member (3380) and the second elastic part (3360) act together on the third connecting shaft (3320) to adjust the position of the third connecting shaft (3320) in the third mounting hole (3330).

13. A folding bicycle according to claim 12, characterized in that: 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 a fifth mounting hole (3213) is provided on the second protruding portion (3212), the second limiting member (3214) is a second limiting bolt, and the second limiting bolt is threadedly connected to the fifth mounting hole (3213).

14. A folding bicycle according to claim 13, characterized in that: 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).

15. A folding bicycle according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8 or 9 or 10 or 13 or 14, characterized in that: The folding bicycle also includes a first connecting member for the folding 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).

16. A folding bicycle according to claim 15, characterized in that: 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 an eighth mounting hole (4120), the main beam (1100) is provided with a second mounting hole (1108), the eighth mounting hole (4120) and the second mounting hole (1108) are connected by bolts (4130), so as to realize the connection between the tenon (4100) and the main beam (1100); And / or a step portion (4200) is provided at the bottom of the tenon (4100), and the step portion (4200) is welded to the end of one end of the main beam (1100).

17. A folding bicycle according to claim 16, characterized in that: The main beam (1100) is hollow or one end of the main beam (1100) is provided with a first 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 first installation groove (1109) at one end of the main beam (1100) to achieve 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) to achieve 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 first 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 eighth mounting hole (4120); The main beam (1100) is hollow or the other end of the main beam (1100) is provided with a second 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 second 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).

18. A folding bicycle according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8 or 9 or 10 or 13 or 14 or 17, characterized in that: 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 fourth connecting member (5100) via a fourth connecting shaft (5120), and the fourth connecting member (5100) is connected to the pedal center shaft (5500).

19. A folding bicycle according to claim 18, characterized in that: A positioning portion (5210) is also provided at one end of the crank (5200), and the fourth connecting member (5100) is provided with a fifth positioning hole (5110) or a second positioning groove, and the positioning portion (5210) matches the fifth positioning hole (5110) or the second positioning groove; Or one end of the crank (5200) is also provided with a fifth positioning hole (5110) or a second positioning groove, and the fourth connecting member (5100) is provided with a positioning portion (5210), and the positioning portion (5210) matches the fifth positioning hole (5110) or the second positioning groove.

20. A folding bicycle according to claim 19, characterized in that: The fourth 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); one end of the crank (5200) is provided with two fourth protruding portions (5230), 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 fourth connecting shaft (5120); the front and rear side surfaces of the fourth protruding portion (5230) are respectively provided with a positioning portion (5210), and the fourth connecting member (5100) on both sides of the third protruding portion (5130) is respectively provided with a fifth positioning hole (5110); The fifth positioning hole (5110) is located in the first inner recess (5160) of the fourth connecting member (5100), the cross section of the first inner recess (5160) is arc-shaped, the cross section of the top of the two fourth protrusions (5230) is arc-shaped, and the two fourth protrusions (5230) are matched with the corresponding first inner recess (5160) respectively; The other end of the crank (5200) is connected to the fifth connecting member (5300), and the fifth connecting member (5300) is connected to the pedal (5400) via a fifth connecting shaft.

21. A folding bicycle according to claim 19, characterized in that: The fourth 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 via a fourth 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 second inner recesses (5170) are provided on the end surface of one end of the crank (5200). The cross section of the second inner recesses (5170) is arc-shaped. The two second inner recesses (5170) are respectively located on both sides of the sixth protrusion (5240), and the two second inner recesses (5170) are respectively matched with the corresponding fifth protrusion (5140); The other end of the crank (5200) is connected to the fifth connecting member (5300), and the fifth connecting member (5300) is connected to the pedal (5400) via a fifth connecting shaft.

22. A folding bicycle according to claim 18, characterized in that: The fourth connecting member (5100) is provided with a second extending portion (5180), the second extending portion (5180) is provided with a seventh positioning portion (5181), the seventh positioning portion (5181) is provided with a seventh protrusion (5182), the seventh protrusion (5182) and the second extending portion (5180) form a seventh slot (5183), the crank (5200) is provided with a first positioning hole (5252) or a third positioning slot, and a movable third positioning pin (5260), when the crank (5200) is unfolded, the seventh positioning portion (5181) is embedded in the first positioning hole (5252) or the third positioning slot, and one end of the third positioning pin (5260) matches the seventh slot (5183).

23. A folding bicycle according to claim 22, characterized in that: A hollow channel (5250) is provided in the crank (5200), and a third positioning pin (5260) moves in the hollow channel (5250), and a third elastic portion (5270) is further provided in the hollow channel (5250) corresponding to the other end of the third positioning pin (5260); a through hole (5251) communicating with the hollow channel (5250) is provided on the crank (5200), and a push rod (5262) ​​passes through the through hole (5251) to connect with the third positioning pin (5260); A protruding step portion (5184) is provided on the second extension portion (5180) near the seventh positioning portion (5181), and the shape of the protruding step portion (5184) matches the shape of the first positioning hole (5252) or the third positioning groove; an inclined surface (5261) is provided on one side of one end of the third positioning pin (5260) corresponding to the protruding step portion (5184); and / or the crank (5200) is also provided with a magnetic positioning portion (5280); the fourth connecting member (5100) is connected to the pedal middle axis (5500) via a fixing bolt (5185), and the distance between the magnetic positioning portion (5280) and the fourth connecting axis (5120) is equal to the distance between the fixing bolt (5185) and the fourth connecting axis (5120); And / or the second extension (5180) is made of metal.

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