A swing tricycle

Abstract

The present invention relates to a swing-type tricycle, wherein the vehicle body comprises a frame, two first wheels movably connected to the front end of the frame, and a second wheel movably connected to the rear end of the frame, wherein a swing mechanism is arranged between the two first wheels, and when the vehicle body is in an inclined state, the second connecting rod of the swing mechanism supports and drives the first wheel to deflect, and the first connecting rod located above the second connecting rod can also constrain the upper part of the first wheel, and the two cooperate with each other, which is equivalent to forming a parallelogram structure, so that the deflection is more stable, the angle changes linearly, and there will be no situation where a large angle changes suddenly; in addition, the design of constraining the first connecting rod and the second connecting rod on the frame can distribute the stress of the two connecting rods themselves during deflection to the frame for joint bearing, and since the frame often has higher strength, such a design can make up for the shortcoming of insufficient connecting rod strength, thereby improving the service life of the whole vehicle.

Description

Technical Field

[0001] The invention relates to a tricycle, in particular to a swing-type tricycle with two front wheels capable of swinging. Background Art

[0002] Tricycles, power-assisted bicycles and recreational vehicles usually have different vehicle structures from two-wheeled traditional bicycles. Such bicycles are often equipped with a bucket or compartment in front of or behind the riding position to meet the load-bearing requirements. For example, there is a kind of inverted three-wheeled recreational vehicle, where the handlebars control the two front wheels, and the bucket is also fixed between the two front wheels. Objects can be placed in the bucket or children can sit in it, making it easier for the rider to look after them.

[0003] For traditional inverted tricycles, during use, the body cannot be tilted, and the two front wheels must fall to the ground together (otherwise it is easy to roll over), and in order to ensure the space in the bucket, the distance between the two front wheels cannot be too small. In this way, during the use of this bicycle, the two front wheels restrain each other with greater force, and the control of the handlebars will obviously feel stiff, and it is difficult to change direction. Especially when making a big turn (such as turning 90 degrees to the left / right or even more than 90 degrees), the centrifugal effect caused by the turn cannot be compensated by the tilt of the body like a traditional bicycle, which leads to a generally large turning radius of this type of vehicle. When the bucket carries heavy objects, the turning radius will be even larger to ensure safety, and if you are not careful, it is easy to roll over, which is not safe enough. To ensure safety, when a big turn is required, the rider often gets off the vehicle and pushes it. It can be seen that there are many inconveniences in the actual use of the existing leisure vehicle.

[0004] For this purpose, a Chinese patent with patent number CN200720011505.3 (publication number CN201023610Y) discloses a "new tricycle", which includes a body, wheels, and wheel shock absorbers. The upper part of the shock absorber of the rear wheel is rotatably connected to the two ends of the swing control rod, the middle part of the swing control rod is provided with a control shaft, the middle part of the shock absorber of the rear wheel is rotatably connected to the two ends of the support frame, the middle part of the support frame is provided with a load-bearing shaft horizontal to the front and rear of the body, the load-bearing shaft is rotatably connected to the support frame, the control shaft is rotatably connected to the body, and the load-bearing shaft is fixed on the body. It should be pointed out that in this patent, the shock absorber is used on an ordinary tricycle with two wheels on the rear side, not the above-mentioned inverted tricycle. The two rear wheel shock absorbers of this patent form a four-bar linkage with the support frame and the swing control rod, so that the two rear wheels of the tricycle are always in contact with the ground when turning, so as to achieve the purpose of preventing rollover.

[0005] Although the above-mentioned tricycle reduces the radius of the tricycle when turning by tilting the wheel body, its swinging and tilting involves two parts, the support frame and the swing control rod. Only the lower support frame is associated with the load-bearing axis of the vehicle body. Although the tilting of the tricycle when turning is achieved, the lack of association between the swing control rod and the load-bearing axis leads to insufficient restraint of the support frame on the tilting of the vehicle body, which is reflected in the abrupt swing of the vehicle body, lack of integrity and great incoordination; on the other hand, if the support frame is used as the swing support, when the vehicle body is in a tilted state, the center of gravity falls completely on the support frame, which will cause uneven force distribution of the support frame and its adjacent parts, which will cause safety hazards in long-term use. At the same time, the shock absorber in the patent cannot be adapted to the above-mentioned inverted tricycle.

[0006] In addition, the tilt locking mechanism of the tricycle is only set at the joint and lacks limiting force. It is easy to cause unnecessary tilt of the body due to accidental touch during daily use. Summary of the invention

[0007] The first technical problem to be solved by the present invention is to provide a swinging tricycle that can provide effective support and stable constraints for the inclination of the vehicle body and wheels in response to the current status of the prior art. The swinging mechanism of the tricycle can make it easy to turn, greatly reduce the turning radius, and is not prone to rollover during driving, making it safer.

[0008] The second technical problem to be solved by the present invention is to provide a swing type tricycle with a simple and effective locking operation for the swing mechanism in view of the current status of the prior art.

[0009] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a swing-type tricycle, comprising:

[0010] The vehicle body comprises a vehicle frame, two first wheels movably connected to the front end of the vehicle frame, and a second wheel movably connected to the rear end of the vehicle frame;

[0011] A swing mechanism is arranged between the two first wheels, and the swing mechanism comprises:

[0012] A first connecting rod, wherein a portion thereof is rotatably constrained on the frame, a rotation axis of the first connecting rod is consistent with an extension direction of the frame, and two ends of the first connecting rod are respectively connected to the first wheel so as to be deflected to the left or right relative to the first wheel;

[0013] A second connecting rod is arranged below the frame and its middle portion is rotatably constrained on the frame. The second connecting rod has a rotation axis that is vertically parallel to the rotation axis of the first connecting rod and can move relative to the left and right. Both ends of the second connecting rod are connected to the first wheel so as to be rotatable to the left or right relative to the first wheel, and both ends of the second connecting rod are always located below both ends of the first connecting rod.

[0014] When the vehicle body is in a tilted state, the first connecting rod and the second connecting rod can rotate around the rotation axis of their respective middle parts, and move to the left or right side in a staggered manner and approach each other up and down.

[0015] In order to further ensure that the first connecting rod and the second connecting rod can be installed on the connecting seat and have a reasonable layout, preferably, the rocking tricycle also includes a connecting seat extending up and down, the frame is passed through the middle part of the connecting seat, the middle part of the first connecting rod is rotationally constrained at the upper end of the connecting seat, and the middle part of the second connecting rod is rotationally constrained at the lower end of the connecting seat.

[0016] The connecting seat can be in different forms. Specifically, the connecting seat includes two connecting plates arranged at intervals along the extension direction of the frame, a first rotating shaft is provided between the upper ends of the two connecting plates, and the first connecting rod is provided with a first shaft sleeve matching the first rotating shaft in the middle; a second rotating shaft is provided between the lower ends of the two connecting plates, and the second connecting rod is provided with a second shaft sleeve matching the second rotating shaft in the middle.

[0017] In order to facilitate the tilting of the vehicle body, preferably, the first connecting rod has two auxiliary rods distributed on both sides of the first sleeve, and each auxiliary rod is in an arc-shaped structure with both ends bent upward, so as to form a clearance gap in the middle for avoiding the bottom of the box. With such a clearance gap design, when the vehicle body tilts and moves, the first connecting rod will not be affected by the existence of the box to affect its reciprocating movement, further ensuring the smooth tilting of the vehicle body.

[0018] In order to achieve the installation of the wheel and the first connecting rod and the second connecting rod, preferably, a vertically arranged support seat is provided on the axle of each first wheel, the axle can rotate relative to the support seat, and the end of the first connecting rod and the end of the second connecting rod are rotatably connected to the upper and lower parts of the support seat respectively.

[0019] Specifically, the support seat includes a first support plate arranged adjacent to the first link and the second link, and a second support plate arranged adjacent to the corresponding first wheel, the end of the first link is connected to the upper end of the first support plate, the second link is connected to the lower end of the first support plate, the second support plate is arranged at one end of the axle, and the first wheel is installed at the other end of the axle. The design of the support seat can divide the tilting and swinging of the first wheel into two parts, the inner and outer movement of the upper and lower parts, which are connected and driven by the first link and the second link respectively, thereby ensuring the effective tilting of the first wheel.

[0020] In order to compensate for the travel difference that may be caused by the deflection of the first wheel, the first support plate and the second support plate are movably connected together through a joint bearing. The joint bearing includes a bearing outer ring and a ball head embedded in the bearing outer ring. The bearing outer ring is connected to the first support plate, and the ball head is connected to the second support plate.

[0021] In order to further solve the above second technical problem, the technical solution adopted by the present invention is: it also includes a limiting mechanism, and the limiting mechanism includes:

[0022] A first limiting plate is provided on the first connecting rod and is provided with a limiting opening extending along the extension direction of the frame;

[0023] A second limiting piece is arranged at an interval from the first limiting piece and is provided with a limiting groove which penetrates along the extension direction of the frame and extends along the swing direction of the first connecting rod;

[0024] A limiting rod connected to the frame and arranged to move back and forth along the extending direction of the frame to be alternately limited in the limiting opening or the limiting groove;

[0025] When the limiting rod moves to be limited in the limiting opening, the vehicle body is in a first use state;

[0026] When the limit rod moves to the state where it is limited in the limit groove, the vehicle body is in the second use state. The design of such a limit mechanism can flexibly select the state that the vehicle body needs to be in through the position of the limit rod, realize turning tilt during driving, avoid turning too large, realize stable verticality of the vehicle body during straight driving or when stationary, and avoid unnecessary tilting caused by accidental touch. Moreover, through the cooperation of the limit rod and the slots of different diameters on the limit plate, the mechanical structure is stable and mature, and is simpler and more efficient.

[0027] Specifically, a vertically extending bracket is provided at a position adjacent to the end portion of the first end of the frame, the limiting rod is mounted on the bracket via a sleeve, and the first limiting plate and the second limiting plate are both located between the two connecting plates, the limiting rod is arranged outside the two connecting plates, and can move toward the first limiting plate and the second limiting plate.

[0028] In order to ensure that the vehicle body has the maximum tilt angle when it is tilted realistically, preferably, the longitudinal cross-section of the limit groove is an arc-shaped structure with both ends bent upward, and when the vehicle body is tilted to the left or right, the first connecting rod swings synchronously with the vehicle body to make the limit rod abut against the corresponding end walls at both ends of the limit groove, thereby forming a limit for the tilt of the vehicle body on that side. There are many forms of limiting the tilt of the vehicle body. In this way, the limit rod and the limit groove are slidably matched, and the end walls at both ends of the limit groove are used to form a limit on the sliding stroke of the limit rod, which is very convenient and practical.

[0029] In order to ensure that the vehicle body is locked and does not tilt in a natural state, preferably, the limiting mechanism also includes an elastic member, and the power output end of the elastic member acts on the limiting rod so that the limiting rod always has a tendency to move toward the first limiting plate and the second limiting plate.

[0030] There are various structures for realizing locking of the limit rod. Preferably, the limit rod is at least partially located in one end portion of the sleeve, the other end of the sleeve is provided with a locking end, the elastic member is arranged in the sleeve and the two ends are respectively against the locking end and the limit rod.

[0031] In order to ensure that the limit can be triggered stably, preferably, the limit mechanism also includes a trigger member, the power output end of the trigger member acts on the limit rod, and can move the limit rod in a direction away from the first limit plate and the second limit plate, thereby putting the elastic member in an energy storage state.

[0032] In order to make the limiting rod easier to operate, preferably, the frame is provided with a handlebar, the handlebar is provided with a switch, and the trigger member is a traction rope with one end connected to the limiting rod and the other end connected to the switch.

[0033] In order to realize the steering action of the vehicle body when driving, the rocking tricycle also includes a steering mechanism, which includes a steering seat and a steering rod. The power input end of the steering seat is connected to the output end of the handlebar and can rotate synchronously with the handlebar. There are two steering rods, one end of each steering rod is connected to the corresponding side of the steering seat, and the other end is connected to the rear side of the corresponding first wheel. Under the rotation of the steering seat, the steering rod drives the first wheel to deflect towards the turning side, and the deflection axis of the first wheel extends vertically.

[0034] Compared with the prior art, the advantages of the present invention are: in the rocking mechanism of the rocking tricycle, the first connecting rod and the second connecting rod can both rotate relative to the frame. When the body of the tricycle is in a tilted state, in addition to the supporting and driving deflection of the first wheel by the second connecting rod, the first connecting rod located above the second connecting rod can also constrain the upper part of the first wheel. The two cooperate with each other, which is equivalent to forming a parallelogram structure, so that the deflection is more stable, the angle changes linearly, and there will be no sudden change in angle. In addition, the design of constraining the first connecting rod and the second connecting rod on the frame can distribute the stress of the two connecting rods themselves during deflection to the frame for joint bearing. Since the frame often has higher strength, such a design can make up for the shortcoming of insufficient connecting rod strength, thereby improving the service life of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of a rocking tricycle in an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of the overall structure of the swing-type tricycle after omitting the box in the embodiment of the present invention;

[0037] Figure 3 for Figure 2 Schematic diagram from another angle;

[0038] Figure 4 It is a schematic diagram of the first end of the frame after omitting some structures in the embodiment of the present invention;

[0039] Figure 5 for Figure 4 A schematic diagram of partial structural decomposition from another angle;

[0040] Figure 6 for Figure 5 Schematic diagram of partial structural decomposition from the first angle;

[0041] Figure 7 for Figure 5 Schematic diagram of partial structural decomposition from the first angle;

[0042] Figure 8 It is an overall schematic diagram of the limiting mechanism in an embodiment of the present invention;

[0043] Fig. 9 It is a partial cross-sectional view of the cooperation between the limiting mechanism and the frame in the embodiment of the present invention;

[0044] Fig.10 for Fig. 9 The enlarged schematic diagram of point A in the middle;

[0045] Fig.11 It is a schematic diagram of the swing mechanism of the swing-type tricycle in a normal state according to an embodiment of the present invention;

[0046] Fig.12 Schematic diagram of the rocking mechanism of the rocking tricycle in a tilted state in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below with reference to the accompanying drawings.

[0048] like Figures 1 to 12 As shown, it is a preferred embodiment of the present invention. In this embodiment, the swing tricycle includes a body 1 and a swing mechanism R, wherein the body 1 has a frame 11, two first wheels 13 movably connected to the front end of the frame 11, and a second wheel 14 movably connected to the rear end of the frame 11.

[0049] Generally speaking, a handlebar 112 is provided on the vehicle frame 11, and the steering of the vehicle body 1 is achieved through a steering mechanism 7. Specifically, the steering mechanism 7 in this embodiment includes a steering seat 71 and a steering rod 72, the power input end of the steering seat 71 is connected to the output end of the handlebar 112, and can rotate synchronously with the handlebar 112, there are two steering rods 72, one end of each steering rod 72 is connected to the corresponding side of the steering seat 71, and the other end is connected to the rear side of the corresponding first wheel 13, and under the rotation of the steering seat 71, the steering rod 72 drives the first wheel 13 to deflect toward the turning side, and the deflection axis of the first wheel 13 extends vertically. The above-mentioned steering mechanism is a conventional configuration of a tricycle and will not be described in detail here.

[0050] When turning, the deflection and tilting of the vehicle body 1 is achieved by a swaying mechanism R, which is arranged between the two first wheels 13, and specifically includes a first link 2 and a second link 3, wherein the middle part of the first link 2 can be rotatably constrained on the frame 11, the rotation axis of the first link 2 is consistent with the extension direction of the frame 11, and the two ends can be connected to the first wheel 13 to deflect to the left or right relative to the first wheel 13; and the second link 3 is arranged below the frame 11 and the middle part can be rotatably constrained on the frame 11, the rotation axis of the second link 3 is arranged parallel to the rotation axis of the first link 2 and can be displaced relative to the left and right, and the two ends can be connected to the first wheel 13 to deflect to the left or right relative to the first wheel 13, and the two ends of the second link 3 are always located below the two ends of the first link 2. In addition, the swaying tricycle mentioned in this embodiment also includes a box 12, which is installed on the frame 1 and located between the two first wheels 13 above the center rod 11a of the frame 1.

[0051] It is precisely because of the connection method of the first link 2 and the second link 3 in the rocking mechanism R that the vehicle body 1 can be tilted when turning, thereby having a smaller turning radius, that is, when the vehicle body 1 is in a tilted state, the first link 2 and the second link 3 can rotate around the rotation axis of their respective middle parts, and move to the left or right in an interlaced manner and approach each other up and down. The rotation form of the two links allows the ends of the first link 2 and the second link 3 to move to the left or right, and the ends of both can also deflect up and down relative to the first wheel 13. For example, if the first link 2 moves to the left relative to the second link 3, the second link 3 moves to the right relatively, so as to drive the upper part of the first wheel 13 to deflect to the tilted side and the lower part to deflect in the opposite direction to the tilted side, thereby driving the two first wheels 13 to automatically adjust to a state of tilting on the same side as the vehicle body 1, see Fig.11 , Fig.12 .

[0052] Specifically, the first connecting rod 2 and the second connecting rod 3 are constrained on the frame 11 through the connecting seat 4, and the connecting seat 4 is basically extended vertically, wherein the frame 11 is arranged in the middle of the connecting seat 4, the middle part of the first connecting rod 2 is rotationally constrained at the upper end of the connecting seat 4, and the middle part of the second connecting rod 3 is rotationally constrained at the lower end of the connecting seat 4. The connecting seat 4 in this embodiment specifically includes two connecting pieces 41 arranged at intervals along the extension direction of the frame 11, a first rotating shaft 4a is provided between the upper ends of the two connecting pieces 41, and the first connecting rod 2 is provided with a first shaft sleeve 20 matching the first rotating shaft 4a in the middle; a second rotating shaft 4b is provided between the lower ends of the two connecting pieces 41, and the second connecting rod 3 is provided with a second shaft sleeve 30 matching the second rotating shaft 4b in the middle. In addition, in order to prevent the first link 2 from colliding with the box 12 when moving, the first link 2 has two auxiliary rods 21 distributed on both sides of the first sleeve 20, and each auxiliary rod 21 is an arc-shaped structure with both ends bent upward, so as to form a clearance gap 22 in the middle to avoid the bottom of the box 12. When the tricycle is in motion and the body 1 is in a non-tilted state, the two first wheels 13 are in a vertical state, and the rotation axis of the first link 2, the rotation axis of the second link 3 and the center rod 11a of the frame 11 are located on the same vertical plane. At this time, the first link 2, the second link 3 and the two support seats 5 form a rectangle, and the connecting piece 41 is also in a vertical state.

[0053] The assembly form of the first wheel 13 and the first link 2 and the second link 3 will inevitably affect the tilting effect of the vehicle body 1. In this embodiment, the ends of the first link 2 and the second link 3 are indirectly connected to the corresponding first wheel 13 through the support seat 5. The two support seats 5 together with the first link 2 and the second link 3 form a stable parallelogram, so that the staggered lateral movement of the first link 2 and the second link 3 is smoother.

[0054] In this embodiment, the support seat 5 includes a first support plate 51 arranged adjacent to the first link 2 and the second link 3, and a second support plate 52 arranged adjacent to the corresponding first wheel 13. The end of the first link 2 is connected to the upper end of the first support plate 51, and the second link 3 is connected to the lower end of the first support plate 51. The second support plate 52 is arranged at one end of the axle 53, and the first wheel 13 is installed at the other end of the axle 53. In addition, in order to compensate for the travel difference generated when the first wheel 13 is tilted, the first support plate 51 and the second support plate 52 are movably connected together through a joint bearing 54. The joint bearing 54 includes a bearing outer ring 541 and a ball head 542 embedded in the bearing outer ring 541. The bearing outer ring 541 is connected to the first support plate 51, and the ball head 542 is connected to the second support plate 52.

[0055] Of course, the vehicle body 1 needs to be flexibly switched between the two use states, so the swing tricycle also includes a limiting mechanism 6. Specifically, the limiting mechanism 6 includes a first limiting piece 61, a second limiting piece 62 and a limiting rod 63. The first limiting piece 61 is arranged on the first connecting rod 2, and a limiting opening 610 is provided thereon, which is through the extension direction of the frame 11. The second limiting piece 62 is arranged at intervals from the first limiting piece 61, and a limiting groove 620 is provided thereon, which is through the extension direction of the frame 11 and extends along the swing direction of the first connecting rod 2. The limiting rod 63 is connected to the frame 11 and is arranged to move back and forth along the extension direction of the frame 11 to alternately limit in the limiting opening 610 or the limiting groove 620. When the limiting rod 63 moves to the state where it is limited in the limiting opening 610, the vehicle body 1 is in the first use state, and when the limiting rod 63 moves to the state where it is limited in the limiting groove 620, the vehicle body 1 is in the second use state. In this way, by manipulating the positional relationship between the limiting rod 63 and the two limiting plates, the limiting rod 63 is placed in the limiting opening 610 or the limiting groove 620 , so that the tilting state of the vehicle body 1 can be easily switched.

[0056] Specifically, the first end of the vehicle frame 11 in this embodiment is provided with a bracket 111 extending vertically at a position adjacent to the end, the limiting rod 63 is mounted on the bracket 111 through a sleeve 64, and the first limiting piece 61 and the second limiting piece 62 are both located between the two connecting pieces 41, the limiting rod 63 is arranged outside the two connecting pieces 41, and can move toward the first limiting piece 61 and the second limiting piece 62. The longitudinal cross-section of the above-mentioned limiting groove 620 is an arc-shaped structure with both ends bent upward, and when the vehicle body 1 is tilted to the left or right, the first connecting rod 2 and the vehicle body 1 swing synchronously, so that the limiting rod 63 abuts against the corresponding end walls at both ends of the limiting groove 620, thereby forming a limit for the vehicle body 1 to tilt on that side.

[0057] In addition, in order to realize the automatic reset of the limit rod 63, the limit mechanism 6 also includes an elastic member 65, and the power output end of the elastic member 65 acts on the limit rod 63, so that the limit rod 63 always has a tendency to move toward the first limit plate 61 and the second limit plate 62. The limit rod 63 is at least partially located in one end of the sleeve 64, and the other end of the sleeve 64 is provided with a locking end 66. The elastic member 65 is arranged in the sleeve 64 and its two ends are respectively against the locking end 66 and the limit rod 63.

[0058] In order to switch the tilt state of the vehicle body 1 at a convenient position of the vehicle body 1, the above-mentioned limiting mechanism 6 also includes a trigger member 67, the power output end of the trigger member 67 acts on the limiting rod 63, and can move the limiting rod 63 in a direction away from the first limiting piece 61 and the second limiting piece 62, thereby putting the elastic member 65 in an energy storage state. A handlebar 112 is provided on the frame 11, and a switch is provided on the handlebar 112. The trigger member 67 is a traction rope with one end connected to the limiting rod 63 and the other end connected to the switch.

[0059] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A swing-type tricycle, comprising: A vehicle body (1) comprises a vehicle frame (11), two first wheels (13) movably connected to the front end of the vehicle frame (11), and a second wheel (14) movably connected to the rear end of the vehicle frame (11); The invention is characterized in that a swing mechanism (R) is arranged between the two first wheels (13), and the swing mechanism comprises: A first connecting rod (2), wherein the middle portion is rotatably constrained on the vehicle frame (11), the rotation axis of the first connecting rod (2) is consistent with the extension direction of the vehicle frame (11), and the two ends are respectively connected to the first wheel (13) so as to be deflected to the left or right relative to the first wheel (13); A second connecting rod (3) is arranged below the vehicle frame (11) and the middle part of the second connecting rod (3) is rotatably constrained on the vehicle frame (11). The rotation axis of the second connecting rod (3) is arranged vertically parallel to the rotation axis of the first connecting rod (2) and can be displaced relative to the left and right. The two ends of the second connecting rod (3) can be connected to the first wheel (13) in a manner of being deflected to the left or right relative to the first wheel (13). The two ends of the second connecting rod (3) are also always located below the two ends of the first connecting rod (2). When the vehicle body (1) is in a tilted state, the first connecting rod (2) and the second connecting rod (3) can rotate around the rotation axis of their respective middle parts, and move to the left or right in an interlaced manner and approach each other up and down; It also includes a connecting seat (4) extending up and down, the frame (11) is arranged in the middle of the connecting seat (4), the middle part of the first connecting rod (2) is rotationally constrained at the upper end of the connecting seat (4), and the middle part of the second connecting rod (3) is rotationally constrained at the lower end of the connecting seat (4); the connecting seat (4) includes two connecting plates (41) arranged at intervals along the extension direction of the frame (11), a first rotating shaft (4a) is provided between the upper ends of the two connecting plates (41), and the first connecting rod (2) is provided with a first shaft sleeve (20) matching the first rotating shaft (4a) in the middle; a second rotating shaft (4b) is provided between the lower ends of the two connecting plates (41), and the second connecting rod (3) is provided with a second shaft sleeve (30) matching the second rotating shaft (4b) in the middle; It also includes a limiting mechanism (6), wherein the limiting mechanism (6) includes: A first limiting plate (61) is provided on the first connecting rod (2) and is provided with a limiting opening (610) extending along the extension direction of the vehicle frame (11); A second limiting plate (62) is arranged at an interval from the first limiting plate (61), and is provided with a limiting groove (620) which passes through the extension direction of the frame (11) and extends along the swing direction of the first connecting rod (2); A limiting rod (63) is connected to the frame (11) and is arranged to move back and forth along the extension direction of the frame (11) to alternately limit the position in the limiting opening (610) or the limiting groove (620); When the limiting rod (63) moves to be limited in the limiting opening (610), the vehicle body (1) is in a first use state; When the limiting rod (63) moves to a state where it is limited in the limiting groove (620), the vehicle body (1) is in a second use state.

2. The rocking tricycle according to claim 1, characterized in that: The first connecting rod (2) has two auxiliary rods (21) distributed on both sides of the first shaft sleeve (20), and each auxiliary rod (21) is an arc-shaped structure with both ends bent upward, so that a clearance gap (22) is formed in the middle to avoid the bottom of the box (12).

3. The rocking tricycle according to claim 1 or 2, characterized in that: A vertically arranged support seat (5) is provided on the wheel axle (53) of each first wheel (13); the wheel axle (53) can rotate relative to the support seat (5); and the end of the first connecting rod (2) and the end of the second connecting rod (3) are rotatably connected to the upper part and the lower part of the support seat (5), respectively.

4. The rocking tricycle according to claim 3, characterized in that: The support seat (5) comprises a first support plate (51) arranged adjacent to the first connecting rod (2) and the second connecting rod (3), and a second support plate (52) arranged adjacent to the corresponding first wheel (13), the end of the first connecting rod (2) is connected to the upper end of the first support plate (51), the second connecting rod (3) is connected to the lower end of the first support plate (51), the second support plate (52) is arranged on one end of the wheel axle (53), and the first wheel (13) is installed on the other end of the wheel axle (53).

5. The rocking tricycle according to claim 4, characterized in that: The first support plate (51) and the second support plate (52) are movably connected together via a joint bearing (54); the joint bearing (54) comprises a bearing outer ring (541) and a ball head (542) embedded in the bearing outer ring (541); the bearing outer ring (541) is connected to the first support plate (51), and the ball head (542) is connected to the second support plate (52).

6. The rocking tricycle according to claim 1, characterized in that: A vertically extending bracket (111) is provided at a position adjacent to the first end of the frame (11); the limiting rod (63) is mounted on the bracket (111) via a sleeve (64); the first limiting plate (61) and the second limiting plate (62) are both located between the two connecting plates (41); the limiting rod (63) is arranged outside the two connecting plates (41) and is movable toward the first limiting plate (61) and the second limiting plate (62).

7. The rocking tricycle according to claim 6, characterized in that: The longitudinal cross-section of the limiting groove (620) is an arc-shaped structure with both ends bent upward, and when the vehicle body (1) is tilted to the left or right, the first connecting rod (2) and the vehicle body (1) swing synchronously, so that the limiting rod (63) abuts against the corresponding end walls at both ends of the limiting groove (620), thereby forming a limit for the vehicle body (1) to tilt to that side.

8. The rocking tricycle according to claim 7, characterized in that: The limiting mechanism (6) further comprises an elastic member (65), the power output end of the elastic member (65) acting on the limiting rod (63) so that the limiting rod (63) always has a tendency to move towards the first limiting piece (61) and the second limiting piece (62).

9. The rocking tricycle according to claim 8, characterized in that: The limiting rod (63) is at least partially located in one end portion of the sleeve (64), and the other end of the sleeve (64) is provided with a locking end (66). The elastic member (65) is arranged in the sleeve (64) and its two ends respectively abut against the locking end (66) and the limiting rod (63).

10. The rocking tricycle according to claim 9, characterized in that: The limiting mechanism (6) further comprises a trigger member (67), the power output end of the trigger member (67) acting on the limiting rod (63) and enabling the limiting rod (63) to move in a direction away from the first limiting plate (61) and the second limiting plate (62), thereby placing the elastic member (65) in an energy storage state.

11. The rocking tricycle according to claim 10, characterized in that: The frame (11) is provided with a handlebar (112), the handlebar (112) is provided with a switch, and the trigger member (67) is a traction rope having one end connected to the limit rod (63) and the other end connected to the switch.

12. The rocking tricycle according to claim 11, characterized in that: The vehicle further comprises a steering mechanism (7), wherein the steering mechanism (7) comprises a steering seat (71) and a steering rod (72), wherein a power input end of the steering seat (71) is connected to an output end of the handlebar (112) and can rotate synchronously with the handlebar (112), wherein there are two steering rods (72), wherein one end of each steering rod (72) is connected to a corresponding side of the steering seat (71), and the other end is connected to a rear side of a corresponding first wheel (13), and under the rotation of the steering seat (71), the steering rod (72) drives the first wheel (13) to deflect toward a turning side, and the deflection axis of the first wheel (13) extends vertically.

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