Unicycle

Abstract

This invention discloses a unicycle, including a wheel assembly, a frame assembly, and two shock-absorbing assemblies. The wheel assembly includes a guide structure and a wheel, with a guide structure connected to each side of the wheel along its own axis of rotation. The frame assembly is movably arranged relative to the wheel assembly in the vertical direction. Each shock-absorbing assembly corresponds to one of the guide structures and includes a sleeve and a rod. The sleeve is connected to the wheel assembly, and the rod is connected to the frame assembly. The rod slidably passes through the sleeve and guide structure in the vertical direction, forming a variable air chamber between the rod and the sleeve. Because one end of the rod is connected to the frame assembly, and the other end is slidably connected to the guide structure of the wheel assembly, the rod can be directly connected to both the frame assembly and the wheel assembly, resulting in greater consistency in the horizontal movement of the frame assembly and the wheel assembly, thus improving the unicycle's horizontal stability.

Description

Technical Field

[0001] This invention relates to the field of unicycle technology, and particularly to a unicycle. Background Technology

[0002] To further alleviate air pollution and urban traffic congestion, smaller short-distance transportation tools are being chosen by more and more people. Among them, electric unicycles are favored by consumers for their stylishness and portability.

[0003] In related technologies, electric unicycles include a frame assembly, a wheel assembly, and a shock absorber. The frame assembly and the wheel assembly are connected by the shock absorber. The shock absorber ensures that the electric unicycle can maintain the stability of the frame assembly when traveling on uneven roads, thus improving the user experience.

[0004] However, while the shock absorbers on existing electric unicycles can effectively reduce shock in the vertical direction, they are less stable in the horizontal direction, which affects the horizontal stability of the electric unicycle during operation. Summary of the Invention

[0005] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and this invention provides a unicycle with better stability.

[0006] The unicycle provided according to an embodiment of the present invention includes a wheel assembly, a frame assembly, and two shock-absorbing assemblies. The wheel assembly includes a guide structure and a wheel, with a guide structure connected to each side of the wheel in the axial direction. The frame assembly is movably disposed relative to the wheel assembly in the vertical direction. The shock-absorbing assemblies are disposed in a one-to-one correspondence with the guide structures. Each shock-absorbing assembly includes a sleeve and a rod. The sleeve is connected to the wheel assembly, and the rod is connected to the frame assembly. The rod slidably passes through the sleeve and the guide structure in the vertical direction, and a variable air cavity is formed between the rod and the sleeve. When relative sliding occurs between the rod and the sleeve, the variable air cavity can be compressed or expanded to provide resistance that prevents relative sliding between the rod and the sleeve.

[0007] The unicycle described in this invention has at least the following beneficial effects: During the operation of the unicycle, when the wheel assembly vibrates up and down relative to the frame assembly, the sleeve can slide up and down relative to the sleeve, so that the variable air chamber is compressed or expanded, thereby reducing the up and down vibration of the frame assembly and improving the stability of the frame assembly; at the same time, since one end of the sleeve is connected to the frame assembly and the other end of the sleeve is slidably connected to the guide structure of the wheel assembly, the sleeve can be directly connected to the frame assembly and the wheel assembly respectively, making the horizontal movement of the frame assembly and the wheel assembly more consistent and improving the horizontal stability of the unicycle.

[0008] According to the embodiments of the present invention, the shock absorption assembly of the unicycle further includes a damping valve, and a damping cavity is formed between the sleeve and the sleeve. The damping cavity is filled with damping fluid, and the damping valve is disposed in the damping cavity, dividing the damping cavity into a vertically distributed first fluid cavity and a second fluid cavity.

[0009] The unicycle according to an embodiment of the present invention further includes a first blocking structure, and the shock absorption assembly further includes a separating structure and a second blocking structure. The separating structure and the second blocking structure are both disposed between the sleeve rod and the sleeve. The separating structure is disposed between the first blocking structure and the second blocking structure, and the second blocking structure is sleeved on the sleeve rod. A damping cavity is formed between the first blocking structure and the separating structure, and a variable air cavity is formed between the second blocking structure and the separating structure.

[0010] According to an embodiment of the present invention, the first blocking structure is disposed below the second blocking structure.

[0011] According to an embodiment of the present invention, the guide structure of the unicycle forms a first blocking structure.

[0012] According to an embodiment of the present invention, the partition structure is movably configured relative to the sleeve and the sleeve rod.

[0013] According to the embodiment of the present invention, the damping valve is provided with a liquid flow channel, and a first through hole and a second through hole are respectively formed at both ends of the liquid flow channel. The first through hole is connected to a first liquid chamber, and the second through hole is connected to a second liquid chamber. The first liquid chamber is located above the second liquid chamber, and the opening size of the first through hole is smaller than the opening size of the second through hole.

[0014] According to an embodiment of the present invention, the unicycle has a first air passage structure inside the sleeve, the first air passage structure includes a first air outlet communicating with a variable air chamber, and the first air passage structure is used to communicate with an air supply device.

[0015] According to an embodiment of the present invention, the unicycle has a second air passage structure in the frame assembly. The second air passage structure is connected to the first air passage structure in each of the two sleeves. The second air passage structure includes an air inlet for connection with an air supply device.

[0016] According to an embodiment of the present invention, the unicycle has a third air passage structure on the sleeve wall, the third air passage structure including a second air outlet communicating with a variable air chamber; the wheel assembly has a fourth air passage structure, and the two third air passage structures are connected through the fourth air passage structure.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is a schematic diagram of the structure of a wheelbarrow according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A cross-sectional view of the wheelbarrow shown;

[0021] Figure 3 for Figure 2 A magnified view of the structure at point A of the wheelbarrow shown;

[0022] Figure 4 for Figure 2 A magnified view of the structure at point B of the wheelbarrow shown;

[0023] Figure 5 for Figure 2 A magnified view of the structure at point C of the unicycle shown.

[0024] Figure label:

[0025] Wheel assembly 100; guide structure 110; end cap 111; pad 112; first sealing ring 113; wheel 120;

[0026] Chassis assembly 200; Air intake 201;

[0027] Shock absorber assembly 300; variable air chamber 301; damping chamber 302; first liquid chamber 302a; second liquid chamber 302b; sleeve 310; sleeve rod 320; first air passage structure 321; first air outlet 321a; damping valve 330; first through hole 331; second through hole 332; annular flow channel 333; fourth sealing ring 334; partition structure 340; slider 341; third sealing ring 342; second blocking structure 350; blocking block 351; limiting member 352; second sealing ring 353. Detailed Implementation

[0028] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0032] The following is for reference. Figures 1 to 5 The unicycle of the present invention will be described in detail.

[0033] Reference Figure 1 According to an embodiment of the present invention, a unicycle includes a wheel assembly 100, a frame assembly 200, and two shock-absorbing assemblies 300.

[0034] The wheel assembly 100 includes a guide structure 110 and a wheel 120. The wheel 120 is connected to a guide structure 110 on each side of its axis. The frame assembly 200 is movably disposed relative to the wheel assembly 100 in the vertical direction. The shock absorber assembly 300 is disposed in a one-to-one correspondence with the guide structure 110. The shock absorber assembly 300 includes a sleeve 310 and a rod 320. The sleeve 310 is connected to the wheel assembly 100, and the rod 320 is connected to the frame assembly 200. The rod 320 slidably passes through the sleeve 310 and the guide structure 110 in the vertical direction. A variable air chamber 301 is formed between the rod 320 and the sleeve 310. When relative sliding occurs between the rod 320 and the sleeve 310, the variable air chamber 301 can be compressed or expanded to provide resistance to prevent relative sliding between the rod 320 and the sleeve 310.

[0035] For example, such as Figure 1 and Figure 2As shown, the unicycle includes a wheel assembly 100, a frame assembly 200, and two shock-absorbing components 300. The wheel assembly 100 is located below the frame assembly 200, and the frame assembly 200 is vertically movable relative to the wheel assembly 100. The wheel assembly 100 includes a wheel 120 and two guide structures 110. The axis of the wheel 120 is in the left-right direction, and the two guide structures 110 are respectively located on the left and right sides of the wheel 120. Two shock-absorbing components 300 are provided, and the two shock-absorbing components 300 are respectively located on the wheel. The shock absorber assembly 300 includes a vertically extending sleeve 310 and a vertically extending rod 320, which are connected to the left and right sides of the 120 and correspond one-to-one with the two guide structures 110. The sleeve 310 is fixedly mounted on the guide structure 110, and the rod 320 is slidably inserted into the sleeve 310 in the vertical direction. The upper end of the rod 320 is fixedly connected to the frame assembly 200, and the lower end of the rod 320 is slidably inserted into the guide structure 110 in the vertical direction. A variable air chamber 301 is formed between the rod 320 and the sleeve 310. During the operation of the unicycle of the present invention, when the unicycle travels on uneven ground, the wheel 120 will shake up and down with the road surface. At this time, the sleeve 320 will slide up and down relative to the sleeve 310 to compress or expand the variable air chamber 301, thereby reducing the shock of the frame assembly 200 and improving the experience of the person on the frame assembly 200. At the same time, since the upper end of the guide rod is fixedly connected to the frame assembly 200 and the lower end of the guide rod is slidably inserted through the guide structure 110, the guide rod can be directly connected to the frame assembly 200 and the wheel assembly 100 respectively, making the horizontal movement consistency of the frame assembly 200 and the wheel assembly 100 higher and improving the horizontal stability of the unicycle.

[0036] In some embodiments of the present invention, the damping assembly 300 further includes a damping valve 330, and a damping cavity 302 is formed between the sleeve 320 and the sleeve 310. The damping cavity 302 is filled with damping fluid, and the damping valve 330 is disposed within the damping cavity 302, dividing the damping cavity 302 into a vertically distributed first liquid cavity 302a and a second liquid cavity 302b. For example, as... Figure 2 and Figure 4As shown, the shock absorber assembly 300 also includes a damping valve 330. A damping cavity 302 is formed between the sleeve rod 320 and the sleeve 310, and the damping cavity 302 is filled with damping fluid. The damping valve 330 is sleeved on the sleeve rod 320 and located within the damping cavity 302. The damping valve 330 divides the damping cavity 302 into a first liquid cavity 302a and a second liquid cavity 302b, which are distributed vertically. When the unicycle travels on uneven ground, the sleeve rod 320 slides up and down relative to the sleeve 310. At this time, the damping valve 330 can move up and down with the sleeve rod 320 within the damping cavity 302. The damping fluid flows back and forth within the first liquid cavity 302a and the second liquid cavity 302b to dissipate the energy of the sleeve rod 320, thereby improving the shock absorption effect of the shock absorber. Understandably, since the damping valve 330 is sleeved on the sleeve rod 320, the height of the damping cavity 302 relative to the wheel 120 remains constant during the up-and-down sliding of the sleeve rod 320 relative to the sleeve 310, thus making the unicycle more stable during travel.

[0037] Specifically, the damping fluid is damping oil. Damping oil has a high surface tension and a good damping effect.

[0038] In some embodiments of the present invention, the unicycle further includes a first blocking structure, and the shock-absorbing assembly 300 further includes a separating structure 340 and a second blocking structure 350. Both the separating structure 340 and the second blocking structure 350 are disposed between the sleeve 320 and the sleeve 310. The separating structure 340 is disposed between the first blocking structure and the second blocking structure 350, and the second blocking structure 350 is sleeved on the sleeve 320. A damping cavity 302 is formed between the first blocking structure and the separating structure 340, and a variable air cavity 301 is formed between the second blocking structure 350 and the separating structure 340. For example, as... Figure 2 As shown, the first blocking structure is fixedly disposed relative to the sleeve 310, the second blocking structure 350 is sleeved on the sleeve rod 320, and the separating structure 340 is fixedly installed on the inner wall of the sleeve 310. A damping cavity 302 is formed between the first blocking structure and the separating structure 340, and an air cavity is formed between the second blocking structure 350 and the separating structure 340. Since the first blocking structure is fixedly disposed relative to the sleeve 310 and the separating structure 340 is fixedly disposed on the inner wall of the sleeve 310, the position of the damping cavity 302 relative to the sleeve 310 is fixed, and thus the position of the damping cavity 302 relative to the wheel 120 is fixed. During the process of the sleeve rod 320 sliding up and down relative to the sleeve 310, the second blocking structure 350 slides up and down with the sleeve rod 320 to move closer to or away from the separating structure 340, thereby compressing or expanding the variable air cavity 301.

[0039] Further reference Figure 2The first blocking structure is located below the second blocking structure 350. It can be understood that the first blocking structure is located below the second blocking structure 350, thus allowing the damping cavity 302 to be located below the air cavity. The damping cavity 302 is filled with damping fluid. The location of the damping cavity 302 below the air cavity lowers the center of gravity of the unicycle, making the unicycle more stable during operation.

[0040] In some embodiments of the present invention, the guide structure 110 forms a first blocking structure. It is understood that the guide structure 110 forming a first blocking structure simplifies the overall structure of the unicycle and reduces its manufacturing cost.

[0041] Optionally, in some other embodiments of the present invention, the first blocking structure and the guide structure 110 are provided separately. In this case, the first blocking structure is provided between the sleeve 310 and the sleeve rod 320, and the first blocking structure is fixedly installed on the inner wall of the sleeve 310.

[0042] In some embodiments of the present invention, the partition structure 340 is movably disposed relative to the sleeve 310 and the rod 320, respectively. It is understood that when the rod 320 slides downward relative to the sleeve 310, the second blocking structure 350 can move downward to compress the variable air chamber 301. At this time, the variable air chamber 301 can apply a thrust to the partition structure 340. Since the partition structure 340 is movably disposed relative to the sleeve 310 and the rod 320, the thrust borne by the partition structure 340 can be directly transmitted to the guide structure 110 through the damping fluid in the damping chamber 302, thereby reducing the stress on the sleeve 310 and the rod 320, improving the stability of the shock absorber assembly 300, and extending the service life of the shock absorber assembly 300.

[0043] In some embodiments of the present invention, reference is made to Figure 5 The first blocking structure includes an end cap 111, a pad 112, and multiple first sealing rings 113. The pad 112 is fitted onto the outside of the end cap 111, and an annular installation gap is left between the upper end of the pad 112 and the upper end of the end cap 111. The installation gap allows the sleeve 310 to extend in. The inner side wall of the lower end of the sleeve 310 is provided with an internal thread, and the outer side wall of the upper end of the end cap 111 is provided with an external thread. The internal thread and the external thread mesh with each other to achieve a detachable connection between the sleeve 310 and the first blocking structure. The inner side wall of the end cap 111 is provided with multiple first sealing rings 113 in the vertical direction. The sleeve rod 320 is slidably inserted on the end cap 111 and abuts against the sealing rings.

[0044] In some embodiments of the present invention, reference is made to Figure 3The second blocking structure 350 includes an annular blocking block 351, an annular limiting member 352, and a second sealing ring 353. There are two limiting members 352, which are distributed vertically and are fixedly sleeved on the outer wall of the sleeve rod 320. The blocking block 351 is sleeved on the outer wall of the sleeve rod 320 and is located between the two limiting members 352. The two limiting members 352 abut against the upper and lower ends of the blocking block 351 respectively to limit and fix the blocking block 351. There are four second sealing rings 353, two of which are vertically arranged between the blocking block 351 and the sleeve rod 320, and the other two are vertically arranged between the blocking block 351 and the sleeve 310.

[0045] In some embodiments of the present invention, reference is made to Figure 4 The partition structure 340 includes an annular slider 341 and eight third sealing rings 342. The slider 341 is slidably disposed between the sleeve rod 320 and the sleeve 310. Four of the third sealing rings 342 are disposed vertically between the slider 341 and the sleeve rod 320, and the other four third sealing rings 342 are disposed vertically between the slider 341 and the sleeve 310.

[0046] In some embodiments of the present invention, the damping valve 330 is provided with a liquid flow channel, and a first through hole 331 and a second through hole 332 are respectively formed at both ends of the liquid flow channel. The first through hole 331 communicates with the first liquid chamber 302a, and the second through hole 332 communicates with the second liquid chamber 302b. The first liquid chamber 302a is located above the second liquid chamber 302b, and the opening size of the first through hole 331 is smaller than the opening size of the second through hole 332. For example, as... Figure 4As shown, the first liquid chamber 302a is located above the second liquid chamber 302b. The damping valve 330 is provided with a liquid flow channel, which includes a first through hole 331, a second through hole 332, and multiple annular flow channels 333. The multiple annular flow channels 333 are distributed vertically and connected in sequence. The first through hole 331 connects the first liquid chamber 302a and the uppermost annular flow channel 333, and the second through hole 332 connects the second liquid chamber 302b and the lowermost annular flow channel 333. The opening size of the first through hole 331 is smaller than the opening size of the second through hole 332. Understandably, due to the downward direction of gravity, the unicycle experiences significant vibration when passing over protrusions. To ensure the stability of the frame assembly 200, the sleeve 320 needs to slide downward relative to the sleeve 310 when the unicycle passes over a protrusion. At this time, the variable air chamber 301 is compressed, and the damping valve 330 slides downward relative to the sleeve 310 along with the sleeve 320. The damping fluid in the second liquid chamber 302b flows into the first liquid chamber 302a through the damping valve 330. By setting the opening size of the second through hole 332 to be larger than the opening size of the first through hole 331, the damping fluid can flow from the second liquid chamber 302b to the first liquid chamber 302a more quickly. This allows the sleeve 320 to move downward relative to the sleeve 310 more quickly, thereby achieving shock absorption of the frame assembly 200 more rapidly.

[0047] Further reference Figure 4 In order to improve the sealing between the damping valve 330 and the sleeve 310, a fourth sealing ring 334 is installed at the annular flow channel 333, and the fourth sealing ring 334 is in close contact with the inner wall of the sleeve 310.

[0048] In some embodiments of the present invention, the sleeve 320 is provided with a first air passage structure 321, the first air passage structure 321 including a first air outlet 321a communicating with the variable air chamber 301, and the first air passage structure 321 is used to communicate with an air supply device. For example, Figure 2 and Figure 3 As shown, the sleeve rod 320 is a hollow rod, so that a vertically extending first air passage structure 321 is formed inside the sleeve rod 320. A first air outlet 321a is opened on the rod wall of the sleeve rod 320, and the first air outlet 321a is connected to the variable air chamber 301. The first air passage structure 321 is used to connect to the air supply device. Then, the operator can operate the air supply device to introduce gas into or expel gas from the variable air chamber 301 through the first air passage structure 321, thereby adjusting the air pressure in the variable air chamber 301 and thus adjusting the shock absorption capacity of the shock absorption component 300.

[0049] Further reference Figure 1The frame assembly 200 is equipped with a second air passage structure, which is connected to the first air passage structure 321 in each of the two sleeves 320. The second air passage structure includes an air inlet 201 for connection to an air supply device. Understandably, the second air passage structure allows the operator to simultaneously control the air pressure in the variable air chambers 301 of the two shock absorber assemblies 300 by introducing or expelling air through the air inlet 201. Simultaneously, the second air passage structure connects the variable air chambers 301 of the two shock absorber assemblies 300, ensuring that the air pressure in the variable air chambers 301 of the two shock absorber assemblies 300 is the same during unicycle operation, thereby improving the stability of the unicycle during travel.

[0050] In other embodiments of the present invention, the sleeve 310 has a third air passage structure on its cylindrical wall, the third air passage structure including a second air outlet communicating with the variable air chamber 301; the wheel assembly 100 has a fourth air passage structure, and the two third air passage structures are connected through the fourth air passage structure. For example, the fourth air passage structure can be set on the axle of the wheel 120, and a portion of the fourth air passage structure is provided on both the axle of the wheel 120 and the guide structure 110. The portions of the third air passage structure and the fourth air passage structure located on the guide structure 110 are connected, so that the third air passage structures of the two shock-absorbing assemblies 300 can be connected through the fourth air passage structure, thereby realizing the connection between the variable air chambers 301 of the two shock-absorbing assemblies 300, so that the air pressure between the two variable air chambers 301 can be kept consistent.

[0051] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wheelbarrow, characterized in that, include: A wheel assembly (100) includes a guide structure (110) and a wheel (120), wherein the wheel (120) is connected to a guide structure (110) on both sides of its own rotation axis. A frame assembly (200) is movably disposed relative to the wheel assembly (100) in the vertical direction; Two shock-absorbing components (300) are provided, each corresponding to a guide structure (110). Each shock-absorbing component (300) includes a sleeve (310) and a rod (320). The sleeve (310) is connected to the wheel assembly (100), and the rod (320) is connected to the frame assembly (200). The rod (320) slides vertically through the sleeve (310) and the guide structure (110). A variable air chamber (301) is formed between the rod (320) and the sleeve (310). When relative sliding occurs between the rod (320) and the sleeve (310), the variable air chamber (301) can be compressed or expanded to provide resistance to prevent relative sliding between the rod (320) and the sleeve (310). The shock absorption assembly (300) also includes a damping valve (330), and a damping cavity (302) is formed between the sleeve rod (320) and the sleeve (310). The damping cavity (302) is filled with damping fluid, and the damping valve (330) is disposed in the damping cavity (302) and divides the damping cavity (302) into a vertically distributed first liquid cavity (302a) and a second liquid cavity (302b). The first blocking structure, the shock absorption assembly (300) further includes a partition structure (340) and a second blocking structure (350), the partition structure (340) and the second blocking structure (350) are both disposed between the sleeve rod (320) and the sleeve (310), the partition structure (340) is disposed between the first blocking structure and the second blocking structure (350), the second blocking structure (350) is sleeved on the sleeve rod (320), the damping cavity (302) is formed between the first blocking structure and the partition structure (340), and the variable air cavity (301) is formed between the second blocking structure (350) and the partition structure (340); The second blocking structure (350) can slide up and down with the sleeve (320) to get closer to or away from the separating structure (340), the damping valve (330) can move up and down in the damping cavity (302) with the sleeve (320), and the separating structure (340) is fixed on the inner wall of the sleeve (310).

2. A wheelbarrow according to claim 1, characterized in that, The first blocking structure is located below the second blocking structure (350).

3. A wheelbarrow according to claim 2, characterized in that, The guide structure (110) forms the first blocking structure.

4. A wheelbarrow according to claim 3, characterized in that, The partition structure (340) is movably disposed relative to the sleeve (310) and the sleeve rod (320).

5. A wheelbarrow according to claim 1, characterized in that, The damping valve (330) is provided with a liquid flow channel. A first through hole (331) and a second through hole (332) are formed at both ends of the liquid flow channel. The first through hole (331) is connected to the first liquid chamber (302a), and the second through hole (332) is connected to the second liquid chamber (302b). The first liquid chamber (302a) is located above the second liquid chamber (302b), and the opening size of the first through hole (331) is smaller than the opening size of the second through hole (332).

6. A wheelbarrow according to claim 1, characterized in that, The sleeve (320) is provided with a first air passage structure (321), the first air passage structure (321) includes a first air outlet (321a) communicating with the variable air chamber (301), and the first air passage structure (321) is used to communicate with the air supply device.

7. A wheelbarrow according to claim 6, characterized in that, The frame assembly (200) is provided with a second air passage structure, which is connected to the first air passage structure (321) in the two sleeves (320) respectively. The second air passage structure includes an air inlet (201) for connection with an air supply device.

8. A wheelbarrow according to claim 1, characterized in that, The sleeve (310) has a third air passage structure on its cylinder wall, the third air passage structure including a second air outlet communicating with the variable air chamber (301); the wheel assembly (100) has a fourth air passage structure, and the two third air passage structures are connected through the fourth air passage structure.

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