A folding scooter

Abstract

An embodiment of the present invention discloses a folding scooter, comprising: a frame, a driving mechanism, a transmission mechanism, a front wheel and a rear wheel; the driving mechanism includes a left crank, a left pedal, a right crank and a right pedal; the front wheel includes a left front wheel and a right front wheel that are parallel to each other; the rear wheel includes a left rear wheel, a right rear wheel and a suspension frame; the frame has a folding state with the transmission mechanism, the driving mechanism and the rear wheel. In the folding state, the frame is located between the left front wheel and the right front wheel, the left crank, the left pedal and the left rear wheel are respectively parallel to the left side of the left front wheel, and the right crank, the left pedal and the right rear wheel are respectively parallel to the right side of the right front wheel. By folding the frame between the left front wheel and the right front wheel, folding and attaching the left crank, the left pedal and the left rear wheel to the left side of the left front wheel, and folding and attaching the right crank, the right pedal and the right rear wheel to the right side of the right front wheel, the overall volume of the scooter is very small after folding, which is very convenient for storage and carrying.

Description

Technical Field

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

[0002] Traditional bicycles are large in volume and heavy in weight, making them inconvenient to carry and store. Buses and subways prohibit the carrying of such bicycles. Therefore, various types of folding bicycles have emerged on the market. Using the folding principle, they have to a certain extent met the requirements of being light in weight, small in volume, and convenient to operate.

[0003] Currently, folding bicycles on the market usually have a folding design for the frame part, the handlebar stem, and the handlebars to achieve the purpose of reducing the occupied space. However, this folding method still results in a relatively large volume after folding the bicycle, making it inconvenient for storage and carrying. Therefore, a folding bicycle with a smaller volume after folding is needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a folding balance bike to reduce the volume of the bicycle after folding.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A folding balance bike, comprising: a frame, a drive mechanism, a transmission mechanism, a front wheel, and a rear wheel;

[0006] The drive mechanism includes a left crank, a left pedal, a right crank, and a right pedal. The left pedal is foldably connected to the rear end of the left crank, and the right pedal is foldably connected to the rear end of the right crank; the transmission mechanism is foldably connected to the frame, and the transmission mechanism has an output end and an input end, and the input end is respectively connected to the front end of the left crank and the front end of the right crank;

[0007] The front wheel includes a left front wheel and a right front wheel that are parallel to each other. The output end of the transmission mechanism is respectively connected to the left front wheel and the right front wheel, and the transmission mechanism is located between the left front wheel and the right front wheel;

[0008] The rear wheel includes a left rear wheel, a right rear wheel, and a suspension frame. The middle of the suspension frame is connected to the frame, one end of the suspension frame is connected to the left rear wheel, and the other end is connected to the right rear wheel;

[0009] The frame, the transmission mechanism, the drive mechanism, and the rear wheel all have a folded state. In the folded state, the frame is located between the left front wheel and the right front wheel, the left crank, the left pedal, and the left rear wheel are respectively parallel to the left side of the left front wheel, and the right crank, the left pedal, and the right rear wheel are respectively parallel to the right side of the right front wheel.

[0010] Preferably, the front end of the frame is provided with a U-shaped opening and a connection hole. A quick-release rod detachably connected to the U-shaped opening and a connection shaft rotatably connected to the connection hole are respectively arranged on the transmission mechanism. Removing the quick-release rod enables the frame to rotate around the connection shaft;

[0011] Limit protrusions are respectively arranged on both sides of the U-shaped opening. Limit nuts are respectively arranged at both ends of the quick-release rod. Inner grooves matched with the limit protrusions are arranged on the inner sides of the limit nuts;

[0012] The quick-release rod has two states: open and closed. In the closed state, the inner groove is clamped with the limit protrusion, and the quick-release rod can be restricted within the U-shaped opening; in the open state, the inner groove is separated from the limit protrusion, and the quick-release rod can be separated from the U-shaped opening.

[0013] Preferably, a first lower limit part is connected to the left end of the connection shaft for limiting the lower limit position of the rotation of the left crank. A first elastic block is arranged at the end of the first lower limit part. When the left crank is at the lower limit position of rotation, it abuts against the first elastic block;

[0014] A second lower limit part is connected to the right end of the connection shaft for limiting the lower limit position of the rotation of the right crank. A second elastic block is arranged at the end of the second lower limit part. When the right crank is at the lower limit position of rotation, it abuts against the second elastic block.

[0015] Preferably, the input end of the transmission mechanism is a drive shaft arranged on the drive mechanism. A first ratchet is arranged at the front end of the left crank. The left crank is connected to the left end of the drive shaft through the first ratchet. A second ratchet is arranged at the front end of the right crank. The right crank is connected to the right end of the drive shaft through the second ratchet.

[0016] Preferably, a first upper limit part is arranged on the left side surface of the transmission mechanism. The first upper limit part is close to the left end of the drive shaft for limiting the upper limit position of the rotation of the left crank;

[0017] A second upper limit part is arranged on the right side surface of the transmission mechanism. The second upper limit part is close to the right end of the drive shaft for limiting the upper limit position of the rotation of the right crank.

[0018] Preferably, a first connecting sleeve is provided at the front end of the left crank, the first connecting sleeve is sleeved on the first ratchet, and a first limit block is provided on the outer wall of the first connecting sleeve; the first upper limit portion includes a first torsion spring and a first limit claw, the first limit claw has a protruding first claw end, the first limit claw can be rotatably sleeved on the transmission mechanism, one end of the first torsion spring is clamped with the first limit claw, and the other end is clamped on the transmission mechanism, the first claw end is limited to a limit position of the first limit block, and the first limit claw can be rotated to make the first claw end disengage from the limit position of the first limit block;

[0019] A second connecting sleeve is provided at the front end of the right crank, and the second connecting sleeve is sleeved on the second ratchet, and a second limit block is provided on the outer wall of the second connecting sleeve; the second upper limit portion includes a second torsion spring and a second limit claw, and the second limit claw has a protruding second claw end, and the second limit claw can be rotatably sleeved on the transmission mechanism, one end of the second torsion spring is clamped with the second limit claw, and the other end is clamped on the transmission mechanism, limiting the second claw end to a limit position relative to the second limit block, and rotating the second limit claw can make the second claw end disengage from the limit position relative to the second limit block.

[0020] Preferably, a third torsion spring is sleeved on the left end of the driving shaft, one end of the third torsion spring is clamped with the first connecting sleeve, and the other end of the third torsion spring is clamped with the transmission mechanism;

[0021] A fourth torsion spring is sleeved on the right end of the driving shaft, one end of the fourth torsion spring is clamped with the second connecting sleeve, and the other end of the fourth torsion spring is clamped with the transmission mechanism.

[0022] Preferably, a first connecting tube is provided at the rear end of the left crank, the first connecting tube having a first interface and a second interface with axes perpendicular to each other, the first interface is sleeved with the left crank, the second interface is connected to the left pedal, and the left pedal can be folded around the rear end of the left crank;

[0023] A second connecting tube is provided at the rear end of the right crank, and the second connecting tube has a third interface and a fourth interface whose axes are perpendicular to each other. The third interface is sleeved on the right crank, and the fourth interface is connected to the right pedal. The right pedal can be folded around the rear end of the right crank.

[0024] Preferably, the first connecting tube further includes a first anti-rotation interface, and the left crank further includes a first anti-rotation component, the first anti-rotation component passes through the first anti-rotation interface and is detachably connected to the left crank, and limits the first connecting tube;

[0025] The second connecting pipe further includes a second anti-rotation interface, and the right crank further includes a second anti-rotation assembly. The second anti-rotation assembly passes through the second anti-rotation interface and is detachably clamped with the right crank, and limits the second connecting pipe.

[0026] Preferably, a connecting rod is provided in the middle of the suspension frame, and the connecting rod is rotatably connected to the rear end of the vehicle frame;

[0027] A left wheel arm is connected between the suspension frame and the left rear wheel, and the left wheel arm can rotate around the axis at the left end of the suspension frame;

[0028] A right wheel arm is connected between the suspension frame and the right rear wheel, and the right wheel arm can rotate around the axis at the right end of the suspension frame.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. By folding the vehicle frame between the left front wheel and the right front wheel, folding and fitting the left crank, the left footrest and the left rear wheel on the left side of the left front wheel, and folding and fitting the right crank, the right footrest and the right rear wheel on the right side of the right front wheel, the overall volume of the scooter is very small after folding, which is very convenient for storage and carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0032] Figure 1 is a schematic structural diagram of the folding scooter in the use state proposed by the present invention Figure 1 ;

[0033] Figure 2 is a schematic structural diagram of the folding scooter in the use state proposed by the present invention Figure 2 ;

[0034] Figure 3 is an exploded structural schematic diagram of the folding scooter in the use state proposed by the present invention;

[0035] Figure 4 is a schematic structural diagram of the folding scooter in the folded state proposed by the present invention;

[0036] Figure 5 is an exploded structural schematic diagram of the left crank and the left footrest of the folding scooter proposed by the present invention;

[0037] Figure 6 is an exploded structural schematic diagram of the vehicle frame of the folding scooter proposed by the present invention;

[0038] Figure 7Explosion structure schematic diagram of the first upper limit part of the folding scooter proposed by the present invention.

[0039] Reference numerals:

[0040] 10, frame; 11, U-shaped opening; 111, limit protrusion; 12, connection hole;

[0041] 20, drive mechanism; 21, left crank; 211, first ratchet; 2111, first tooth seat; 2112, first elastic piece; 2113, first ratchet tooth; 2114, first tooth sleeve; 212, first connection sleeve; 213, first limit block; 214, first connection pipe; 2141, first interface; 2142, second interface; 2143, first anti-rotation interface; 2144, first anti-rotation assembly; 2145, elastic piece; 2146, first anti-rotation retaining piece; 2147, screw; 22, left footrest; 23, right crank; 231, second ratchet; 2311, second tooth seat; 2312, second elastic piece; 2313, second ratchet tooth; 2314, second tooth sleeve; 232, second connection sleeve; 233, second limit block; 234, second connection pipe; 2341, third interface; 2342, fourth interface; 2343, second anti-rotation interface; 2344, second anti-rotation assembly; 24, right footrest; 25, drive shaft; 251, third torsion spring; 252, fourth torsion spring;

[0042] 30, transmission mechanism; 31, quick release lever; 311, limit nut; 312, inner groove; 32, connection shaft; 33, first lower limit part; 331, first elastic block; 34, second lower limit part; 341, second elastic block; 35, first upper limit part; 351, first limit claw; 352, first torsion spring; 353, first claw end; 36, second upper limit part; 361, second limit claw; 362, second torsion spring; 363, second claw end;

[0043] 40, front wheel; 41, left front wheel; 42, right front wheel;

[0044] 50, rear wheel; 51, left rear wheel; 52, right rear wheel; 53, suspension frame; 531, left wheel arm; 5311, first wheel fork; 532, right wheel arm; 5321, second wheel fork; 533, connecting rod. Detailed implementation manners

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In addition, the terms "first", "second", "third", "upper, lower, left, right", etc. are only used for descriptive purposes, in order to facilitate the description of the present invention and simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation, indication or implication of the relative importance of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. At the same time, in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0046] The following will describe the implementation of the present invention in detail in conjunction with specific embodiments.

[0047] As Figures 1-7 shown, it is an embodiment provided by the present invention.

[0048] An embodiment of the present invention provides a folding scooter, including: a frame 10, a driving mechanism 20, a transmission mechanism 30, a front wheel 40 and a rear wheel 50; the driving mechanism 20 includes a left crank 21, a left pedal 22, a right crank 23 and a right pedal 24. The left pedal 22 is foldably connected to the rear end of the left crank 21, and the right pedal 24 is foldably connected to the rear end of the right crank 23; the transmission mechanism 30 is foldably connected to the frame 10. The transmission mechanism 30 has an output end and an input end. The input ends of the left front wheel 41 are respectively connected to the front ends of the left crank 21 and the right crank 23; the front wheel 40 includes a left front wheel 41 and a right front wheel 42 that are parallel to each other. The output end of the transmission mechanism 30 is respectively connected to the left front wheel 41 and the right front wheel 42. The transmission mechanism 30 is located between the left front wheel 41 and the right front wheel 42; the rear wheel 50 includes a left rear wheel 51, a right rear wheel 52 and a suspension frame 53. The middle of the suspension frame 53 is connected to the frame 10. One end of the suspension frame 53 is connected to the left rear wheel 51, and the other end is connected to the right rear wheel 52; the frame 10, the transmission mechanism 30, the driving mechanism 20 and the rear wheel 50 all have a folding state. In the folding state, the frame 10 is located between the left front wheel 41 and the right front wheel 42. The left crank 21, the left pedal 22 and the left rear wheel 51 are respectively parallel to the left side of the left front wheel 41, and the right crank 23, the left pedal 22 and the right rear wheel 52 are respectively parallel to the right side of the right front wheel 42.

[0049] In an embodiment of the present invention, since the above-mentioned folding scooter does not include structures such as a handlebar and a seat, the left crank 21, the left pedal 22, the right crank 23, and the right pedal 24 are the main load-bearing mechanisms. Therefore, the materials used for these structures need to have relatively high strength or be able to bear more weight than common cranks and pedals. Different from traditional bicycles, the above-mentioned folding scooter is "front-wheel 40 drive" to drive the rear wheel 50. The user alternately steps on the left pedal 22 and the right pedal 24 to drive the up and down rotation of the left crank 21 and the right crank 23, and transmits the power to the transmission mechanism 30. And the front wheel 40 includes a left front wheel 41 and a right front wheel 42. The left front wheel 41 and the right front wheel 42 are parallel to each other and are arranged at a certain distance. Compared with the traditional bicycle where the drive chain is arranged on one side of the wheel, the transmission mechanism 30 in this embodiment is located between the left front wheel 41 and the right front wheel 42, making the overall structure of the vehicle compact, reducing space occupancy, and such an arrangement can make the transmission of power more balanced, without tilting to the left or right, and the loss caused during the force transmission process is also smaller, making the bicycle easier to ride and more efficient. The transmission mechanism 30 has an outer protective shell, which can support the frame 10 and play a connecting role. The function of the rear wheel 50 is both a balance wheel and a support wheel. The rear wheel 50 includes a left rear wheel 51 and a right rear wheel 52. Compared with the front wheel 40, the distance between the left rear wheel 51 and the right rear wheel 52 is larger. This can assist the user in maintaining balance and stabilizing the center of gravity during riding, making the balance bicycle easier to operate and more entertaining. Compared with the traditional folding bicycle, in this embodiment, after removing the handlebar and the seat, the volume of the whole vehicle before folding is also smaller. When folding, as Figure 4 shown, the frame 10 hinged to the transmission mechanism 30 can be directly folded between the left front wheel 41 and the right front wheel 42. Rotating the left crank 21 and the right crank 23 upward and forward can make the left and right cranks 23 respectively parallel and fit on both sides of the front wheel 40. Then, rotating the left pedal 22 and the right pedal 24 forward to the front wheel 40 respectively makes them respectively parallel and fit on both sides of the front wheel 40. After folding, the whole vehicle is tightly attached to the front wheel 40, and the whole is more compact and occupies less space.

[0050] In one embodiment, the front end of the frame 10 is provided with a U-shaped opening 11 and a connection hole 12. The transmission mechanism 30 is respectively provided with a quick-release rod 31 detachably connected to the U-shaped opening 11 and a connection shaft 32 rotatably connected to the connection hole 12. Removing the quick-release rod 31 allows the frame 10 to rotate around the connection shaft 32.

[0051] Limit protrusions 111 are respectively provided on both sides of the U-shaped opening 11. Limit nuts 311 are respectively provided at both ends of the quick-release rod 31. Inner grooves 312 matching the limit protrusions 111 are provided on the inner sides of the limit nuts 311.

[0052] The quick-release rod 31 has two states: open and closed. In the closed state, the inner groove 312 is engaged with the limiting protrusion 111, and the quick-release rod 31 can be restricted within the U-shaped opening 11. In the open state, the inner groove 312 is separated from the limiting protrusion 111, and the quick-release rod 31 can be separated from the U-shaped opening 11.

[0053] In this embodiment, as Figure 6 shown, the frame 10 is generally rod-shaped as a whole. The housing of the transmission mechanism 30 is rotatably connected to the frame 10 through a connecting shaft 32. The quick-release rod 31 is arranged on the housing of the transmission mechanism 30. The U-shaped opening 11 on the frame 10 can be clamped on the quick-release rod 31 for fixation. The function of the quick-release rod 31 is similar to that of a fixing pin, which can change the rotational connection between the transmission mechanism 30 and the frame 10 into a fixed connection. Of course, separating the U-shaped opening 11 from the quick-release rod 31 can make it return to the rotational connection state again. When the folding balance bike needs to be folded, the dial of the quick-release rod 31 is pulled to loosen the limiting nuts 311 at both ends of the quick-release rod 31. At this time, the inner groove 312 inside the limiting nut 311 is separated from the U-shaped limiting protrusion 111 outside the U-shaped opening 11. The U-shaped opening 11 is no longer limited by the inner groove 312, and the U-shaped opening 11 can be separated from the rod part of the quick-release rod 31, leaving only the connecting shaft 32 connecting the transmission mechanism 30 and the frame 10 to achieve rotational folding. Correspondingly, when in use, the quick-release rod 31 is tightened so that the inner groove 312 of the limiting nut 311 is engaged with the limiting protrusion 111 of the U-shaped opening 11, and the U-shaped opening 11 clamps the quick-release rod 31 to achieve the fixing function.

[0054] In one embodiment, a first lower limiting portion 33 is connected to the left end of the connecting shaft 32 for limiting the lower limit position of the rotation of the left crank 21. A first elastic block 331 is provided at the end of the first lower limiting portion 33, and the left crank 21 abuts against the first elastic block 331 when it is in the lower limit position of rotation.

[0055] A second lower limiting portion 34 is connected to the right end of the connecting shaft 32 for limiting the lower limit position of the rotation of the right crank 23. A second elastic block 341 is provided at the end of the second lower limiting portion 34, and the right crank 23 abuts against the second elastic block 341 when it is in the lower limit position of rotation.

[0056] In this embodiment, different from a traditional pedal bicycle where the pedals on the left and right sides continuously perform a complete circular motion during use, the left and right pedals 24 of the above-mentioned folding scooter perform a reciprocating curvilinear motion alternately up and down. Therefore, during the downward movement of the crank, in order to prevent the crank from continuing to perform a circular motion and causing the movement amplitude to be too large for the user to maintain balance, it is necessary to set a lower limit part to limit it. When the user needs to rest, the lower limit part can also support the crank. Specifically, the front ends of the left pedal 22 and the right pedal 24 are respectively connected to both sides of the transmission mechanism 30 at a position close to the upper part of the upper end of the transmission mechanism 30, and the connecting shaft 32 is located at a position close to the lower part of the upper end of the transmission mechanism 30. Taking the left crank 21 and the first lower limit part 33 as an example, the right crank 23 and the second lower limit part 34 are similar. When the left crank 21 abuts against the first lower limit part 33, the left crank 21 is at its rotation lower limit position. At this time, the first lower limit part 33 is as close as possible to the middle of the left crank 21 to avoid the force arm being too long when the left crank 21 is stressed, resulting in excessive pressure on the connection between the first lower limit part 33 or the left crank 21 and the transmission mechanism 30. If the material strength of the left crank 21 or the transmission mechanism 30 is insufficient, there is a risk of breakage. In addition, a first elastic block 331 is provided at the end of the first lower limit part 33, which can form a buffering effect when the left crank 21 abuts against the first lower limit part 33. It can not only protect the left crank 21, but also, since the person is standing while riding, the first elastic block 331 has elasticity and can play a certain shock-absorbing role.

[0057] In one embodiment, the input end of the transmission mechanism 30 is the drive shaft 25 provided on the drive mechanism 20. A first ratchet 211 is provided at the front end of the left crank 21, and the left crank 21 is connected to the left end of the drive shaft 25 through the first ratchet 211. A second ratchet 231 is provided at the front end of the right crank 23, and the right crank 23 is connected to the right end of the drive shaft 25 through the second ratchet 231.

[0058] In this embodiment, as Figure 5As shown, both ends of the drive shaft 25 are respectively connected to the left crank 21 and the right crank 23, transmitting the power of the two cranks to the transmission mechanism 30 connected in the middle, and then driving the front wheel 40 to rotate. The first ratchet wheel 211 and the second ratchet wheel 231 can only rotate in one direction. Taking the first ratchet wheel 211 as an example, the second ratchet wheel 231 is similar. The first ratchet wheel 211 includes a first tooth seat 2111, a first elastic piece 2112, a first ratchet tooth 2113 and a first tooth sleeve 2114. The second ratchet wheel 231 includes a second tooth seat 2311, a second elastic piece 2312, a second ratchet tooth 2313 and a second tooth sleeve 2314. The first ratchet wheel 211 realizes the one-way rotation of the left crank 21 through the first tooth sleeve 2114 arranged inside the front end of the left crank 21 and engaging with the first tooth seat 2111 clamped to the left end of the drive shaft 25. That is, the first ratchet tooth 2113 is stuck on the first tooth seat 2111, one end of the first elastic piece 2112 abuts against the first ratchet tooth 2113, and the other end abuts against the first tooth seat 2111, so that the first ratchet tooth 2113 meshes with the first tooth sleeve 2114 to realize one-way locking. Specifically, when the left crank 21 moves from top to bottom, the left crank 21 and the drive shaft 25 are in a locked state, and the left crank 21 drives the drive shaft 25 to rotate, and the drive shaft 25 does work internally to realize power input. When the left crank 21 moves from bottom to top, the left crank 21 and the drive shaft 25 are in a non-locked state, and the left crank 21 returns upward while the drive shaft 25 does not rotate, that is, the upward movement from bottom to top is the idle stroke of the left crank 21. It is worth mentioning that the number of the above-mentioned first elastic piece 2112 and first ratchet tooth 2113 can be set as required, and can be one, two, three, etc.

[0059] In one embodiment, a first upper limit portion 35 is provided on the left side surface of the transmission mechanism 30. The first upper limit portion 35 is close to the left end of the drive shaft 25 and is used to limit the upper limit position of the rotation of the left crank 21.

[0060] A second upper limit portion 36 is provided on the right side surface of the transmission mechanism 30. The second upper limit portion 36 is close to the right end of the drive shaft 25 and is used to limit the upper limit position of the rotation of the right crank 23.

[0061] In this embodiment, taking the coordinate origin being located on the drive shaft 25 and the X-axis facing the front of the vehicle as an example, the lower limit position of the left crank 21 and the right crank 23 can be set at an angle of 180 to 240 degrees with the horizontal plane. When riding, the user pedals in a range of about 100 degrees, for example, in a range of 135 to 225 degrees, and can always pedal in the most efficient angle interval. The up and down reset also saves a lot of idling strokes compared to the 360-degree circular motion. In this case, the crank can be made longer than the crank of an ordinary bicycle. According to the principle of lever, the longer the force arm, the more labor-saving it is. Since the crank of an ordinary bicycle works in a circle and ensures that the crank cannot hit the ground, its length is limited. In addition, this up and down pedaling is more suitable for standing riding, so it also makes full use of the person's own gravity, so it is easier to ride, and standing riding is also more ergonomic. Combining the above three points, this pedaling system is more efficient than an ordinary bicycle by more than 50%.

[0062] In one embodiment, a first connecting sleeve 212 is provided at the front end of the left crank 21, and the first connecting sleeve 212 is sleeved on the first ratchet 211, and a first limiting block 213 is provided on the outer wall of the first connecting sleeve 212; the first upper limit portion 35 includes a first torsion spring 352 and a first limiting claw 351, and the first limiting claw 351 has a protruding first claw end 353, and the first limiting claw 351 can be rotatably sleeved on the transmission mechanism 30, one end of the first torsion spring 352 is clamped with the first limiting claw 351, and the other end is clamped on the transmission mechanism 30, and the first claw end 353 is limited to the limiting position of the first limiting block 213, and the first limiting claw 351 is rotated to make the first claw end 353 disengage from the limiting position of the first limiting block 213;

[0063] A second connecting sleeve 232 is provided at the front end of the right crank 23, and the second connecting sleeve 232 is sleeved on the second ratchet 231. A second limit block 233 is provided on the outer wall of the second connecting sleeve 232; the second upper limit portion 36 includes a second torsion spring 362 and a second limit claw 361, and the second limit claw 361 has a protruding second claw end 363, and the second limit claw 361 can be rotatably sleeved on the transmission mechanism 30, one end of the second torsion spring 362 is clamped with the second limit claw 361, and the other end is clamped on the transmission mechanism 30, limiting the second claw end 363 to the limiting position of the second limit block 233, and rotating the second limit claw 361 can make the second claw end 363 disengage from the limiting position of the second limit block 233.

[0064] In this embodiment, specifically, taking the left crank 21 as an example (the right crank 23 is similar), the front end of the left crank 21, that is, the end where the left crank 21 is connected to the drive shaft 25, the first connecting sleeve 212 is a hollow tube, sleeved on the first ratchet 211. A toothed structure is provided on the inner wall of the first connecting sleeve 212, which can cooperate with the first tooth sleeve 2114. The first claw end 353 of the first limiting claw 351 abuts against the outer surface of the first connecting sleeve 212. As the first connecting sleeve 212 rotates upward, the first limiting block 213 will abut against the first claw end 353 of the first limiting claw 351, and the first limiting claw 351 forms a limit on the first limiting block 213. As Figure 7 shown, the first limiting claw 351 includes a first torsion spring 352. One end of the first torsion spring 352 is clamped on the first limiting claw 351, and the other end is clamped on the housing of the transmission mechanism 30. When the first limiting claw 351 is rotated, it drives the first torsion spring 352 to twist and generate elastic potential energy. After releasing the first limiting claw 351, the first torsion spring 352 drives the first limiting claw 351 to return to its original position. When the folding scooter needs to be folded, the first limiting claw 351 can be rotated upward to make the first claw end 353 away from the rotation path of the first limiting block 213, so that it can no longer block the first limiting block 213, and then the left crank 21 can rotate upward and forward without obstruction to fold to the side of the front wheel 40.

[0065] In one embodiment, a third torsion spring 251 is sleeved on the left end of the drive shaft 25. One end of the third torsion spring 251 is clamped with the first connecting sleeve 212, and the other end is clamped with the transmission mechanism 30;

[0066] A fourth torsion spring 252 is sleeved on the right end of the drive shaft 25. One end of the fourth torsion spring 252 is clamped with the second connecting sleeve 232, and the other end is clamped with the transmission mechanism 30.

[0067] In this embodiment, in order to enable the left crank 21 and the right crank 23 to automatically reset upward after the process of working downward ends, third torsion spring 251 and fourth torsion spring 252 that are correspondingly matched with it are respectively arranged at both ends of the drive shaft 25. Taking the left crank 21 side as an example, when the left crank 21 is stepped on and rotated downward, it drives the third torsion spring 251 to rotate and wind up. At this time, the third torsion spring 251 continuously accumulates elastic potential energy. When the user shifts the center of gravity and applies force to step on the right crank 23, the left crank 21 is not subject to a downward force. At this time, the elastic potential energy of the third torsion spring 251 is released, driving the left crank 21 to rotate upward and return to its original position, facilitating the user to step back and forth for riding.

[0068] In one embodiment, a first connecting pipe 214 is provided at the rear end of the left crank 21. The first connecting pipe 214 has a first interface 2141 and a second interface 2142 with perpendicular axes. The first interface 2141 is sleeved on the left crank 21, and the second interface 2142 is connected to the left pedal 22. The left pedal 22 can be folded around the rear end of the left crank 21;

[0069] A second connecting pipe 234 is provided at the rear end of the right crank 23. The second connecting pipe 234 has a third interface 2341 and a fourth interface 2342 with perpendicular axes. The third interface 2341 is sleeved on the right crank 23, and the fourth interface 2342 is connected to the right pedal 24. The right pedal 24 can be folded around the rear end of the right crank 23.

[0070] The first connecting pipe 214 further includes a first anti-rotation interface 2143, and the left crank 21 further includes a first anti-rotation assembly 2144. The first anti-rotation assembly 2144 passes through the first anti-rotation interface 2143 and is detachably clamped to the left crank 21 to limit the first connecting pipe 214;

[0071] The second connecting pipe 234 further includes a second anti-rotation interface 2343, and the right crank 23 further includes a second anti-rotation assembly 2344. The second anti-rotation assembly 2344 passes through the second anti-rotation interface 2343 and is detachably clamped to the right crank 23 to limit the second connecting pipe 234.

[0072] In this embodiment, as Figure 5As shown in the figure, taking the first connecting pipe 214 as an example (the second connecting pipe 234 is similar), the first connecting pipe 214 is a "T"-shaped or "L"-shaped connecting pipe. The axis lines of the two end openings of the first connecting pipe 214 are perpendicular to each other. One end of the first connecting pipe 214 is sleeved on the rear end of the left crank 21, and the first connecting pipe 214 can rotate around the axis line of the rear end of the left crank 21. Similarly, the other end of the first connecting pipe 214 is connected to one end of the left footrest 22, and the whole left footrest 22 can rotate around the axis line of the rear end of the left crank 21. When folding the above folding balance bike, rotating the first connecting pipe 214 upward by 90 degrees can make the left footrest 22 fit parallel to the left side of the front wheel 40. In addition, in order to enable the left footrest 22 to support the user's foot during use, a mechanism for preventing the first connecting pipe 214 from rotating is also provided on the first connecting pipe 214. The first anti-rotation assembly 2144 is a combination of one or several components with a circumferential limit structure. The first anti-rotation assembly 2144 is composed of a spring piece 2145, a first anti-rotation retaining piece 2146 and a screw 2147. An inwardly protruding quadrilateral convex block is provided on the inner side of the first anti-rotation retaining piece 2146, and a quadrilateral groove is provided on the end face side of the end of the left crank 21. The quadrilateral convex block and the quadrilateral groove are clamped and then fixed to the end of the left crank 21 by the screw 2147 passing through the first anti-rotation retaining piece 2146. In this way, the first anti-rotation retaining piece 2146 cannot rotate circumferentially. At this time, the spring piece 2145 is clamped between the first anti-rotation retaining piece 2146 and the first connecting pipe 214 to increase the rotational friction of the first connecting pipe 214, that is, only when the left footrest 22 is forcefully pulled during use, the left footrest 22 can rotate. Some clamping blocks can also be provided between the first connecting pipe 214 and the end of the left crank 21, that is, clamping blocks that cooperate with each other are provided on the inner side wall of the first connecting pipe 214 and the outer side wall of the end of the left crank 21 to limit the left footrest 22 when it is folded outward to a position parallel to the horizontal plane. One side of the second connecting pipe 234 is similar to the first connecting pipe 214 and will not be elaborated.

[0073] In one embodiment, a connecting rod 533 is provided in the middle of the suspension bracket 53, and the connecting rod 533 is rotatably connected to the rear end of the vehicle frame 10;

[0074] A left wheel arm 531 is connected between the suspension bracket 53 and the left rear wheel 51, and the left wheel arm 531 can rotate around the axis line of the left end of the suspension bracket 53;

[0075] A right wheel arm 532 is connected between the suspension bracket 53 and the right rear wheel 52, and the right wheel arm 532 can rotate around the axis line of the right end of the suspension bracket 53.

[0076] In this embodiment, the above-mentioned suspension bracket 53 can be an integrally formed part, or can be formed by welding or splicing several components. It can be a V-shaped part or a T-shaped part. After the connecting rod 533 is connected to the vehicle frame 10 through a bearing, at this time, the connecting rod 533 has the function of guiding the rear wheel 50 to turn. It is worth mentioning that the left and right ends of the suspension bracket 53 are slightly inclined upward, while the end of the corresponding left wheel arm 531 connected to the left rear wheel 51 is slightly inclined downward and is connected to the left end of the suspension bracket 53. The specific structure of the right wheel arm 532 is similar to that of the left wheel arm 531. After such connection, when both the left rear wheel 51 and the right rear wheel 52 are in the use state position, the left rear wheel 51 and the right rear wheel 52 are in an external "eight" shape as a whole. At this time, both the left rear wheel 51 and the right rear wheel 52 are below the suspension bracket 53. When both the left rear wheel 51 and the right rear wheel 52 are in the folded state position, the left rear wheel 51, the right rear wheel 52 and the front wheel 40 are parallel as a whole. At this time, both the left rear wheel 51 and the right rear wheel 52 are in front of the suspension bracket 53. The above-mentioned use state position and folded state position refer to two different fixed positions of the left rear wheel 51 and the right rear wheel 52. Since the two wheels are in a parallel state after folding, the overall structure is tightened compared to before folding, the occupied space is reduced, and they can be used as support wheels. In addition, a first wheel fork 5311 is provided at the end of the left wheel arm 531 connected to the left rear wheel 51, and the left rear wheel 51 is connected to the first wheel fork 5311 through a wheel axle and screws; a second wheel fork 5321 is provided at the end of the right wheel arm 532 connected to the right rear wheel 52, and the right rear wheel 52 is connected to the second wheel fork 5321 through a wheel axle and screws.

[0077] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A folding scooter, characterized in that, Including: A frame, a driving mechanism, a transmission mechanism, a front wheel and a rear wheel; The driving mechanism includes a left crank, a left pedal, a right crank and a right pedal. The left pedal is foldably connected to the rear end of the left crank, and the right pedal is foldably connected to the rear end of the right crank. The transmission mechanism is foldably connected to the frame. The transmission mechanism has an output end and an input end, and the input end is respectively connected to the front ends of the left crank and the right crank; The front wheel includes a left front wheel and a right front wheel that are parallel to each other. The output end of the transmission mechanism is respectively connected to the left front wheel and the right front wheel, and the transmission mechanism is located between the left front wheel and the right front wheel; The rear wheel includes a left rear wheel, a right rear wheel and a suspension frame. The middle of the suspension frame is connected to the frame. One end of the suspension frame is connected to the left rear wheel, and the other end is connected to the right rear wheel; The frame, the transmission mechanism, the driving mechanism and the rear wheel all have a folded state. In the folded state, the frame is located between the left front wheel and the right front wheel. The left crank, the left pedal and the left rear wheel are respectively parallel to the left side of the left front wheel, and the right crank, the left pedal and the right rear wheel are respectively parallel to the right side of the right front wheel.

2. The folding scooter according to claim 1, wherein A U-shaped opening and a connection hole are provided at the front end of the frame. A quick-release rod detachably connected to the U-shaped opening and a connection shaft rotatably connected to the connection hole are respectively provided on the transmission mechanism. Removing the quick-release rod allows the frame to rotate around the connection shaft; Limit protrusions are respectively provided on both sides of the U-shaped opening. Limit nuts are respectively provided at both ends of the quick-release rod, and inner grooves matching the limit protrusions are provided on the inner sides of the limit nuts; The quick-release rod has two states: open and closed. In the closed state, the inner groove is clamped with the limit protrusion, and the quick-release rod can be restricted within the U-shaped opening. In the open state, the inner groove is separated from the limit protrusion, and the quick-release rod can be separated from the U-shaped opening.

3. The folding scooter according to claim 2, wherein, A first lower limit portion is connected to the left end of the connection shaft for limiting the lower limit position of the rotation of the left crank. A first elastic block is provided at the end of the first lower limit portion, and the left crank abuts against the first elastic block when it is at the lower limit position of rotation; A second lower limit portion is connected to the right end of the connection shaft for limiting the lower limit position of the rotation of the right crank. A second elastic block is provided at the end of the second lower limit portion, and the right crank abuts against the second elastic block when it is at the lower limit position of rotation.

4. The folding scooter according to claim 1, wherein, The input end of the transmission mechanism is a drive shaft provided on the driving mechanism. A first ratchet is provided at the front end of the left crank, and the left crank is connected to the left end of the drive shaft through the first ratchet. A second ratchet is provided at the front end of the right crank, and the right crank is connected to the right end of the drive shaft through the second ratchet.

5. The folding scooter according to claim 4, wherein A first upper limit portion is provided on the left side surface of the transmission mechanism. The first upper limit portion is close to the left end of the drive shaft and is used for limiting the upper limit position of the rotation of the left crank; A second upper limit portion is disposed on the right side surface of the transmission mechanism, and the second upper limit portion is close to the right end of the driving shaft and is used to limit the upper limit position of the rotation of the right crank.

6. The folding scooter according to claim 5, wherein A first connecting sleeve is provided at the front end of the left crank, the first connecting sleeve is sleeved on the first ratchet, and a first limiting block is provided on the outer wall of the first connecting sleeve; The first upper limit portion includes a first torsion spring and a first limit claw, the first limit claw having a protruding first claw end, the first limit claw being rotatably sleeved on the transmission mechanism, one end of the first torsion spring being clamped with the first limit claw, and the other end being clamped on the transmission mechanism, limiting the first claw end to a limit position relative to the first limit block, and rotating the first limit claw can cause the first claw end to be separated from the limit position relative to the first limit block; A second connecting sleeve is provided at the front end of the right crank, the second connecting sleeve is sleeved on the second ratchet, and a second limiting block is provided on the outer wall of the second connecting sleeve; The second upper limit portion includes a second torsion spring and a second limit claw, the second limit claw having a protruding second claw end, the second limit claw can be rotatably sleeved on the transmission mechanism, one end of the second torsion spring is clamped with the second limit claw, and the other end is clamped on the transmission mechanism, limiting the second claw end to a limit position relative to the second limit block, and rotating the second limit claw can cause the second claw end to be disengaged from the limit position relative to the second limit block.

7. The folding scooter according to claim 6, wherein A third torsion spring is sleeved on the left end of the driving shaft, one end of the third torsion spring is clamped with the first connecting sleeve, and the other end of the third torsion spring is clamped with the transmission mechanism; A fourth torsion spring is sleeved on the right end of the driving shaft, one end of the fourth torsion spring is clamped with the second connecting sleeve, and the other end of the fourth torsion spring is clamped with the transmission mechanism.

8. The folding scooter according to claim 1, wherein, A first connecting tube is provided at the rear end of the left crank, the first connecting tube having a first interface and a second interface with axes perpendicular to each other, the first interface is sleeved with the left crank, the second interface is connected to the left pedal, and the left pedal can be folded around the rear end of the left crank; A second connecting tube is provided at the rear end of the right crank, and the second connecting tube has a third interface and a fourth interface whose axes are perpendicular to each other. The third interface is sleeved on the right crank, and the fourth interface is connected to the right pedal. The right pedal can be folded around the rear end of the right crank.

9. The folding scooter according to claim 8, wherein The first connecting tube further includes a first anti-rotation interface, and the left crank further includes a first anti-rotation component, the first anti-rotation component passes through the first anti-rotation interface and is detachably connected to the left crank, and limits the first connecting tube; The second connecting tube further includes a second anti-rotation interface, and the right crank further includes a second anti-rotation component. The second anti-rotation component passes through the second anti-rotation interface and is detachably connected to the right crank, and limits the second connecting tube.

10. The folding balance bike according to claim 1, characterized in that, A connecting rod is provided in the middle of the suspension frame, and the connecting rod is rotatably connected to the rear end of the frame; A left wheel arm is connected between the suspension frame and the left rear wheel, and the left wheel arm can rotate around the axis of the left end of the suspension frame; A right wheel arm is connected between the suspension bracket and the right rear wheel, and the right wheel arm can rotate around the axis at the right end of the suspension bracket.

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