Shock absorber and monocycle with same

Abstract

The utility model discloses a shock absorber and a wheelbarrow with the shock absorber, which comprise a cylinder barrel with an oil cavity; the piston head is arranged in the oil cavity and divides the oil cavity into a first oil cavity and a second oil cavity, and the piston head is provided with a damping oil passing hole, a one-way valve structure and a two-way oil passing hole; the piston rod comprises a main rod body and a damping adjusting rod, an inner oil cavity is formed in the main rod body, the damping adjusting rod is inserted into the inner oil cavity, and a damping gap is formed between one end of the damping adjusting rod and the inner side wall of the damping oil passing hole; the damping gap and the damping oil passing hole communicate with the second oil cavity and the inner oil cavity, the two-way oil passing hole communicates with the first oil cavity and the second oil cavity, and the one-way valve structure allows oil to flow from the inner oil cavity to the second oil cavity. The inner oil cavity is formed in the main rod body, a new space is opened up under the condition that the size of the cylinder barrel is not increased, meanwhile, flowing of damping oil is achieved through the damping oil passing hole, the one-way valve structure and the two-way oil passing hole, the damping effect is achieved, and occupied space of the whole shock absorber is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field related to shock absorbing equipment, in particular to a shock absorber and a wheelbarrow with the shock absorber. Background Art

[0002] In the field of unicycles, shock absorbers, as a key shock-absorbing accessory, play a vital role in improving riding comfort and safety. Traditional shock absorber designs mainly rely on a combination of springs and damping oil to absorb road vibrations. This type of shock absorber usually includes a cylinder fixedly connected to the vehicle body, filled with high-viscosity damping oil, and equipped with a piston head. A piston rod passes through one end of the cylinder, one end of which is fixedly connected to the wheel frame of the wheel, and the other end is fixedly connected to the piston head in the cylinder. A spring is also sleeved on the outside of the piston rod to provide additional shock-absorbing effect.

[0003] However, in existing shock absorber designs, the piston rod is usually solid. This design needs to provide a cavity and flow channel for the damping oil to flow when controlling the sliding of the piston rod, so that the damping oil can smoothly enter and exit the cylinder during the movement of the piston rod. This design not only increases the volume of the cylinder, but also, in some cases, requires the addition of an additional oil cylinder to provide damping oil in the cylinder, further increasing the volume and complexity of the entire shock absorption system.

[0004] For small unicycles, an overly large shock absorber not only increases the overall weight of the vehicle, but also limits the flexibility of vehicle design. Therefore, how to reduce the size of the shock absorber while ensuring the shock absorption effect has become an urgent problem to be solved in the field of unicycle design. Utility Model Content

[0005] In order to overcome at least one defect of the prior art, the utility model provides a shock absorber and a wheelbarrow with the shock absorber, which can solve the problem of large volume of the shock absorber and meet the demand for a small wheelbarrow.

[0006] The technical solution adopted by the utility model to solve the problem is:

[0007] A shock absorber comprises: a cylinder having an oil chamber therein; a piston head, the piston head being arranged in the oil chamber and dividing the oil chamber into a first oil chamber and a second oil chamber, the piston head being provided with a damping oil through hole, a one-way valve structure and a two-way oil through hole; a piston rod, the piston rod comprising a main rod body and a damping adjustment rod, the main rod body penetrating into the oil chamber from one end of the cylinder barrel and connected to the piston head, an inner oil chamber being formed in the main rod body, the damping adjustment rod being inserted into the inner oil chamber, a damping gap being formed between one end of the damping adjustment rod and an inner side wall of the damping oil through hole; wherein the damping gap and the damping oil through hole communicate the second oil chamber and the inner oil chamber, the two-way oil through hole communicates the first oil chamber and the second oil chamber, and the one-way valve structure allows oil to flow from the inner oil chamber to the second oil chamber.

[0008] By adopting the above scheme, by setting an inner oil chamber in the main rod body of the piston rod, new space is opened up without increasing the volume of the cylinder. At the same time, the flow of damping oil can be realized through the damping oil hole, the one-way valve structure and the two-way oil hole to achieve the damping effect, thereby greatly reducing the space occupied by the overall shock absorber.

[0009] Furthermore, the one-way valve structure includes: an oil passage, which connects the second oil chamber and the inner oil chamber; a cover plate, which can be opened and closed and assembled on the side of the piston head facing the second oil chamber to cover the oil passage; when the piston head slides into the oil chamber, the cover plate abuts against the piston head to close the oil passage; when the piston head slides out of the oil chamber, the cover plate partially detaches from the piston head to open the oil passage.

[0010] By adopting the above solution, the one-way valve structure ensures that the oil can only flow from the inner oil chamber to the second oil chamber, but not in the opposite direction. This design allows the oil to flow smoothly from the inner oil chamber to the second oil chamber when the piston head of the shock absorber slides into the oil chamber, that is, when the vehicle is subjected to compression shock, so that the damping oil in the first oil chamber quickly returns to the second oil chamber, achieving rapid rebound and reset of the piston rod. When the piston head slides out of the oil chamber, that is, when the vehicle rebounds, the oil cannot flow back to the inner oil chamber through the oil channel, thereby avoiding unnecessary energy loss and weakening of the damping effect.

[0011] Furthermore, an adjustment structure is provided between the main rod body and the damping adjustment rod, and the adjustment structure adjusts the relative displacement between the damping adjustment rod and the main rod body to adjust the size of the damping gap.

[0012] By adopting the above scheme and introducing the adjustment structure, users or maintenance personnel can change the size of the damping gap by adjusting the relative displacement between the damping adjustment rod and the main rod body according to actual needs, thereby achieving precise control of the shock absorption effect.

[0013] Furthermore, the adjustment structure includes an adjustment chamber arranged at one end of the cylinder and an adjustment portion arranged at the other end of the damping adjustment rod, the adjustment chamber is provided with an internal thread, and the adjustment portion is provided with an external thread meshing with the internal thread.

[0014] By adopting the above solution, the relative displacement between the damping adjustment rod and the main rod body can be accurately controlled by rotating the damping adjustment rod to engage the internal thread in the adjustment cavity at one end of the cylinder. This design ensures that the size of the damping gap can be fine-tuned as needed, thereby achieving accurate control of the shock absorption effect, and the position of the damping adjustment rod after adjustment can also remain relatively stable, and the shock absorption effect will not be affected by looseness or displacement.

[0015] Furthermore, an extension rod is provided at the other end of the damping adjustment rod, and the extension rod passes through the adjustment cavity and comes out from one end of the cylinder. The part of the extension rod passing through the cylinder is equipped with an adjustment member, and the adjustment member is used to drive the extension rod and the damping adjustment rod to rotate.

[0016] By adopting the above solution, this design avoids the cumbersome steps of disassembling or opening the cylinder to adjust the damping gap, thereby greatly improving the convenience of adjustment. The adjusting member can adjust the damping gap by simple rotation, which is easy to operate.

[0017] Furthermore, the inner oil chamber is a negative pressure chamber.

[0018] By adopting the above solution, when the inner oil chamber is a negative pressure chamber, there is unsatisfied air inside it, so a low-pressure area will be formed inside. This negative pressure state will cause the oil to encounter greater resistance when flowing through the damping oil hole, because the oil needs to overcome the attraction of negative pressure to flow. This increased resistance will further improve the damping effect of the shock absorber.

[0019] Furthermore, a piston rod end cover is provided at the other end of the piston rod, and the piston rod end cover has a damping rod through-hole for the damping adjusting rod to pass through, and the damping rod through-hole includes a sealing portion, and the sealing portion is provided with at least one sealing ring groove, and the sealing ring groove is provided with a sealing ring for sealing with the damping adjusting rod; the adjusting portion is located in the damping rod through-hole and is adjacent to the sealing portion, and the aperture of the sealing portion is smaller than the aperture of the adjusting portion.

[0020] By adopting the above solution, the sealing ring can ensure that oil will not leak from the gap between the piston rod and the damping adjustment rod. Since the aperture of the adjustment part is large, the damping adjustment rod can rotate smoothly during the adjustment process, thereby facilitating the damping adjustment by users or maintenance personnel.

[0021] Furthermore, the cylinder barrel also includes an end cover and a base support, the base support is sealingly connected to the other end of the cylinder barrel, the end cover is assembled on one end of the cylinder barrel, the end cover has a piston rod through hole for the piston rod to pass through, and a limit baffle is arranged on the inner wall of the piston rod through hole, and the limit baffle is used to limit the piston head in the oil chamber.

[0022] By adopting the above scheme, the base seal is connected to the other end of the cylinder, which ensures the closure of the oil chamber, prevents oil leakage from the bottom of the cylinder, and ensures the stable circulation and damping effect of the oil during the operation of the shock absorber; the limit baffle limits the piston head in the oil chamber, limits the movement range of the piston head to a certain extent, ensures the accuracy and stability of its movement trajectory, prevents it from leaving the oil chamber, and affects the normal operation of the shock absorber.

[0023] A wheelbarrow with a shock absorber comprises a wheel, a frame movably connected up and down relative to the wheel, and a shock absorber, wherein the shock absorber is connected between the wheel and the frame to provide damping and shock absorption.

[0024] By adopting the above solution, the effect of reducing the overall volume of the wheelbarrow can be achieved.

[0025] In summary, the shock absorber and the unicycle with the shock absorber provided by the utility model have the following technical effects:

[0026] 1. Reduced volume: By setting an inner oil chamber in the main rod body and inserting the damping adjustment rod into the inner oil chamber, the design that originally required an additional oil cylinder to provide damping oil flow has been optimized. This design significantly reduces the volume of the cylinder, thus meeting the requirements of the small wheelbarrow for the volume of the shock absorber.

[0027] 2. Optimize the flow path of damping oil: The damping oil hole, one-way valve structure and two-way oil hole set on the piston head together constitute the flow path of damping oil. This design not only ensures that the damping oil can flow smoothly when the piston head moves, but also realizes the precise control of the damping oil flow rate through the coordination of the damping gap and the damping oil hole, thereby ensuring the stability and reliability of the shock absorption effect.

[0028] 3. Improve shock absorption effect: The one-way valve structure allows the oil to flow from the inner oil chamber to the second oil chamber. This design can increase the flow resistance of the damping oil when the piston head moves in a certain direction, thereby improving the shock absorption effect. At the same time, the existence of the two-way oil hole ensures that the damping oil can also flow smoothly when the piston head moves in the other direction, thereby achieving a two-way shock absorption effect.

[0029] 4. High flexibility: By adjusting the position of the damping adjustment rod, the size of the damping gap can be changed, thereby adjusting the flow rate of the damping oil and the shock absorption effect. This design enables the shock absorber to adapt to different road conditions and needs, and improves its flexibility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a side structural schematic diagram of an embodiment of the utility model;

[0031] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0032] Figure 3 for Figure 2 Enlarged view of area B in the middle;

[0033] Figure 4 for Figure 2 Enlarged view of middle C area;

[0034] Figure 5 This is a schematic diagram of a partial explosion structure of an embodiment of the utility model;

[0035] Figure 6 A schematic structural diagram of a wheelbarrow according to an embodiment of the utility model;

[0036] Figure 7 The figure is a schematic diagram of the partial explosion structure of a wheelbarrow according to an embodiment of the utility model.

[0037] Among them, the meanings of the accompanying drawings are as follows: 1. cylinder barrel; 11. oil chamber; 111. first oil chamber; 112. second oil chamber; 12. end cover; 121. piston rod through hole; 122. limit baffle; 13. bottom support; 2. piston head; 21. damping oil hole; 22. one-way valve structure; 221. oil passage; 222. cover plate; 223. lip plate; 23. two-way oil hole; 3. piston rod; 31. main rod body; 311. inner oil chamber; 32. damping adjustment rod; 321. extension rod; 33. damping gap; 4. adjustment structure; 41. adjustment chamber; 411. internal thread; 42. adjustment part; 421. external thread; 43. adjustment member; 5. piston rod end cover; 51. damping rod through hole; 511. sealing part; 6. wheel; 7. frame; 8. buffer spring. DETAILED DESCRIPTION

[0038] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] In order to facilitate the understanding of the embodiments of the present utility model, the following will be further explained by taking specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present utility model.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0042] Embodiment 1 of the present utility model is referred to Figure 1-Figure 5 As shown, a shock absorber is disclosed, including a cylinder 1, a piston head 2 and a piston rod 3, wherein the piston rod 3 includes a main rod body 31 and a damping adjustment rod 32, wherein the cylinder 1 has an oil chamber 11, wherein the piston head 2 is arranged in the oil chamber 11 and the oil chamber 11 is divided into a first oil chamber 111 and a second oil chamber 112, wherein the piston head 2 is provided with a damping oil hole 21, a one-way valve structure 22 and a two-way oil hole 23, and preferably, the damping oil hole 21, the one-way valve structure 22 and the two-way oil hole 23 are sequentially arranged radially outwardly along the piston head 2; one end of the main rod body 31 is provided with the One end of the cylinder 1 penetrates into the oil chamber 11 and is connected to the piston head 2, so that the piston head 2 and the piston rod 3 are slidably connected to the cylinder 1, an inner oil chamber 311 is formed in the main rod body 31, and the damping adjustment rod 32 is inserted in the inner oil chamber 311, and a damping gap 33 is formed between one end of the damping adjustment rod 32 and the inner wall of the damping oil hole 21, and the other end of the damping adjustment rod 32 passes through the main rod body 31, and the passed part is in sealing contact with the main rod body 31, so that the oil chamber 11 and the inner oil chamber 311 have good air tightness.

[0043] Among them, see Figure 2 , Figure 4 As shown, the damping gap 33 and the damping oil hole 21 connect the second oil chamber 112 and the inner oil chamber 311, the two-way oil hole 23 connects the first oil chamber 111 and the second oil chamber 112, and the one-way valve structure 22 allows the oil to flow from the inner oil chamber 311 to the second oil chamber 112. By arranging the inner oil chamber 311 in the main rod body 31 of the piston rod 3, a new space is opened up without increasing the volume of the cylinder 1. At the same time, the damping oil can flow through the damping oil hole 21, the one-way valve structure 22 and the two-way oil hole 23 to achieve a damping effect, thereby greatly reducing the space occupied by the overall shock absorber.

[0044] In one embodiment, see Figure 4 As shown, the one-way valve structure 22 includes an oil passage 221 and a cover plate 222. The oil passage 221 connects the second oil chamber 112 and the inner oil chamber 311. The cover plate 222 can be opened and closed and assembled on the side of the piston head 2 facing the second oil chamber 112 to cover the oil passage 221. When the piston head 2 slides into the oil chamber 11, the cover plate 222 abuts against the piston head 2 to close the oil passage 221; when the piston head 2 slides out of the oil chamber 11, the cover plate 222 partially detaches from the piston head 2 to open the oil passage 221, ensuring that the oil can only flow from the inner oil chamber 311 to the second oil chamber 112, but not in the opposite direction, thereby quickly returning the damping oil in the first oil chamber 111 to the second oil chamber 112, thereby achieving rapid rebound and reset of the piston rod 3. In this embodiment 1, the damping oil hole 21 has a lip plate 223 extending into the second oil chamber 112, and the cover plate 222 is clamped between the lip plate 223 and the piston head 2; of course, in other embodiments, the damping oil hole 21 has a separate cylindrical part assembled with the piston head 2, and the cylindrical part is partially exposed to form a lip plate 223 extending into the second oil chamber 112 with the piston head 2, and the cover plate 222 is clamped between the lip plate 223 and the piston head 2. The cover plate 222 is made of a rigid material that can be elastically deformed. When the piston head 2 slides toward the second oil chamber 112, the cover plate 222 is pressed against the piston head 2 by the pressure of the damping oil in the second oil chamber 112, thereby achieving a blocking effect on the oil passage 221; when the piston head 2 slides toward the first oil chamber 111, the cover plate 222 is deformed toward the second oil chamber 112 by the pressure of the damping oil in the first oil chamber 111, thereby opening the oil passage 221 and achieving a circulation effect of the damping oil. With this arrangement, the basic function of a one-way valve can be completed.

[0045] It should be noted that the number of the oil passage channels 221 may be two or more. When there are multiple oil passage channels 221, the oil passage channels 221 are evenly spaced around the damping oil passage hole 21.

[0046] To make the shock absorber's damping adjustable, refer to Figure 3 As shown, in some embodiments, the damping gap 33 is set to be adjustable. Specifically, an adjustment structure 4 can be provided between the main rod body 31 and the damping adjustment rod 32. The adjustment structure 4 adjusts the relative displacement between the damping adjustment rod 32 and the main rod body 31 to adjust the size of the damping gap 33. The introduction of the adjustment structure 4 allows users or maintenance personnel to change the size of the damping gap 33 by adjusting the relative displacement between the damping adjustment rod 32 and the main rod body 31 according to actual needs, thereby achieving precise control of the shock absorption effect. In the present embodiment 1, the adjustment structure 4 includes an adjustment chamber 41 disposed at one end of the cylinder 1 and an adjustment portion 42 disposed at the other end of the damping adjustment rod 32, the adjustment chamber 41 is provided with an internal thread 411, and the adjustment portion 42 is provided with an external thread 421 meshed with the internal thread 411. By rotating the damping adjustment rod 32 to mesh with the internal thread 411 in the adjustment chamber 41 at one end of the cylinder 1, the relative displacement between the damping adjustment rod 32 and the main rod body 31 can be accurately controlled. In other embodiments, the specific implementation method of the adjustment structure 4 is not limited in detail, and it is sufficient to have an adjustable function.

[0047] In this embodiment 1, in order to facilitate the rotation of the damping adjustment rod 32, refer to Figure 3 As shown, optionally, an extension rod 321 is provided at the other end of the damping adjustment rod 32, the extension rod 321 passes through the adjustment chamber 41 and passes out from one end of the cylinder 1, and the portion of the extension rod 321 passing out of the cylinder 1 is equipped with an adjustment member 43, and the adjustment member 43 is used to drive the extension rod 321 and the damping adjustment rod 32 to rotate. The adjustment member 43 is preferably a rotating sleeve or a turntable structure with an anti-slip groove on the outside, and preferably, the adjustment member 43 is fixedly connected to the extension rod 321 by screws, and this arrangement can avoid the cumbersome steps of disassembling or opening the cylinder 1 to adjust the damping gap 33, thereby greatly improving the convenience of adjustment, and the damping gap 33 can be adjusted by simple rotation, which is easy to operate.

[0048] In some embodiments, in order to achieve a better reset effect for the cover plate 222, a concave receiving groove can be optionally provided on the side of the piston head 2 facing the cover plate 222, and a reset spring or a tension spring is provided in the receiving groove. The reset spring is used to provide the cover plate 222 with a force to reset itself toward the piston head 2. The reset spring or the tension spring can provide the cover plate 222 with a force to reset itself toward the piston head 2, thereby avoiding problems such as reset difficulties caused by long-term deformation of the cover plate 222, and thus extending the practical life of the one-way valve structure 22.

[0049] It should be noted that the inner oil chamber 311 is a negative pressure chamber, so the inner oil chamber 311 contains a mixture of damping oil and air, and the air does not fill the inner oil chamber 311. When the inner oil chamber 311 is a negative pressure chamber, there is insufficient air inside, so a low-pressure area is formed inside. This negative pressure state will cause the oil to encounter greater resistance when flowing through the damping oil hole 21, because the oil needs to overcome the attraction of negative pressure to flow. This increased resistance will further improve the damping effect of the shock absorber.

[0050] In this embodiment 1, in order to achieve the airtightness of the oil chamber 11 and the inner oil chamber 311, refer to Figure 3 As shown, a piston rod end cover 5 is provided at the other end of the piston rod 3, and the piston rod end cover 5 has a damping rod through-hole 51 for the damping adjustment rod 32 to pass through, and the damping rod through-hole 51 includes a sealing portion 511, and the sealing portion 511 is provided with at least one sealing ring groove, and the sealing ring groove is provided with a sealing ring for sealing with the damping adjustment rod 32; the adjustment portion 42 is located in the damping rod through-hole 51 and is adjacent to the sealing portion 511, and the aperture of the sealing portion 511 is smaller than the aperture of the adjustment portion 42. With this arrangement, the sealing ring can ensure that oil will not leak from the gap between the piston rod 3 and the damping adjustment rod 32. Since the aperture of the adjustment portion 42 is relatively large, the damping adjustment rod 32 can rotate smoothly during the adjustment process, thereby facilitating the damping adjustment by the user or maintenance personnel. Figure 2 As shown, the cylinder 1 also includes an end cover 12 and a bottom support 13, the bottom support 13 is sealed and connected to the other end of the cylinder 1, the end cover 12 is assembled on one end of the cylinder 1, the end cover 12 has a piston rod through hole 121 for the piston rod 3 to pass through, and a limit baffle 122 is arranged on the inner wall of the piston rod through hole 121, and the limit baffle 122 is used to limit the piston head 2 in the oil chamber 11. This arrangement ensures the closedness of the oil chamber 11, prevents the oil from leaking from the bottom of the cylinder 1, and ensures the stable circulation and damping effect of the oil during the operation of the shock absorber; the limit baffle 122 limits the piston head 2 in the oil chamber 11, limits the movement range of the piston head 2 to a certain extent, ensures the accuracy and stability of its movement trajectory, and prevents it from leaving the oil chamber 11, affecting the normal operation of the shock absorber.

[0051] The utility model also relates to a wheelbarrow with a shock absorber, see Figure 6-7 As shown, it includes a wheel 6, a frame 7 movably connected up and down relative to the wheel 6, and a shock absorber. The shock absorber is connected between the wheel 6 and the frame 7 to provide damping and shock absorption, which can achieve the effect of reducing the overall volume of the wheelbarrow. Specifically, the cylinder 1 is fixed to the wheel 6 through a fixing frame, and the piston rod 3 is outer-mounted with an oil buffer spring 8. One end of the buffer spring 8 is fixedly connected to the frame 7, and the other end abuts against the cylinder 1, which helps to achieve the resetting of the piston rod 3.

[0052] In summary, the shock absorber and the unicycle with the shock absorber provided by the utility model have the following technical effects:

[0053] 1. Reduced volume: By providing an inner oil chamber 311 in the main rod body 31 and inserting the damping adjustment rod 32 into the inner oil chamber 311, the design that originally required an additional oil cylinder to provide damping oil flow is optimized. This design significantly reduces the volume of the cylinder 1, thereby meeting the requirements of the small wheelbarrow for the volume of the shock absorber.

[0054] 2. Optimize the flow path of damping oil: The damping oil hole 21, the one-way valve structure 22 and the two-way oil hole 23 provided on the piston head 2 together constitute the flow path of damping oil. This design not only ensures that the damping oil can flow smoothly when the piston head 2 moves, but also realizes the precise control of the flow rate of damping oil through the coordination of the damping gap 33 and the damping oil hole 21, thereby ensuring the stability and reliability of the shock absorption effect.

[0055] 3. Improve shock absorption effect: The one-way valve structure 22 allows the oil to flow from the inner oil chamber 311 to the second oil chamber 112. This design can increase the flow resistance of the damping oil when the piston head 2 moves in a certain direction, thereby improving the shock absorption effect. At the same time, the existence of the two-way oil hole 23 ensures that the damping oil can also flow smoothly when the piston head 2 moves in another direction, thereby achieving a two-way shock absorption effect.

[0056] 4. High flexibility: By adjusting the position of the damping adjustment rod 32, the size of the damping gap 33 can be changed, thereby adjusting the flow rate of the damping oil and the shock absorption effect. This design enables the shock absorber to adapt to different road conditions and requirements, and improves its flexibility and adaptability.

[0057] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A shock absorber, characterized in that: include: A cylinder barrel (1), wherein the cylinder barrel (1) has an oil chamber (11); A piston head (2), the piston head (2) being arranged in the oil chamber (11) and dividing the oil chamber (11) into a first oil chamber (111) and a second oil chamber (112), the piston head (2) being provided with a damping oil hole (21), a one-way valve structure (22) and a two-way oil hole (23); A piston rod (3), the piston rod (3) comprising a main rod body (31) and a damping adjustment rod (32), the main rod body (31) passing through the oil chamber (11) from one end of the cylinder barrel (1) and connected to the piston head (2), an inner oil chamber (311) being formed in the main rod body (31), the damping adjustment rod (32) being inserted into the inner oil chamber (311), and a damping gap (33) being formed between one end of the damping adjustment rod (32) and the inner side wall of the damping oil hole (21); The damping gap (33) and the damping oil hole (21) are connected to the second oil chamber (112) and the inner oil chamber (311); the two-way oil hole (23) is connected to the first oil chamber (111) and the second oil chamber (112); and the one-way valve structure (22) allows oil to flow from the inner oil chamber (311) to the second oil chamber (112).

2. A shock absorber according to claim 1, characterized in that: The one-way valve structure (22) comprises: An oil passage (221), the oil passage (221) communicating with the second oil chamber (112) and the inner oil chamber (311); A cover plate (222), the cover plate (222) being assembled on a side of the piston head (2) facing the second oil chamber (112) in an openable and closable manner so as to cover the oil passage (221); When the piston head (2) slides into the oil chamber (11), the cover plate (222) abuts against the piston head (2) to close the oil passage (221); when the piston head (2) slides out of the oil chamber (11), the cover plate (222) partially detaches from the piston head (2) to open the oil passage (221).

3. A shock absorber according to claim 1, characterized in that: An adjustment structure (4) is provided between the main rod body (31) and the damping adjustment rod (32), and the adjustment structure (4) adjusts the relative displacement between the damping adjustment rod (32) and the main rod body (31) to adjust the size of the damping gap (33).

4. A shock absorber according to claim 3, characterized in that: The adjustment structure (4) comprises an adjustment chamber (41) arranged at one end of the cylinder (1) and an adjustment portion (42) arranged at the other end of the damping adjustment rod (32), wherein the adjustment chamber (41) is provided with an internal thread (411), and the adjustment portion (42) is provided with an external thread (421) meshing with the internal thread (411).

5. A shock absorber according to claim 4, characterized in that: An extension rod (321) is provided at the other end of the damping adjustment rod (32). The extension rod (321) passes through the adjustment chamber (41) and comes out from one end of the cylinder barrel (1). The portion of the extension rod (321) that passes out of the cylinder barrel (1) is equipped with an adjustment member (43). The adjustment member (43) is used to drive the extension rod (321) and the damping adjustment rod (32) to rotate.

6. A shock absorber according to claim 1, characterized in that: The inner oil chamber (311) is a negative pressure chamber.

7. A shock absorber according to claim 4, characterized in that: The other end of the piston rod (3) is provided with a piston rod end cover (5), the piston rod end cover (5) having a damping rod through hole (51) for the damping adjustment rod (32) to pass through, the damping rod through hole (51) comprising a sealing portion (511), the sealing portion (511) being provided with at least one sealing ring groove, the sealing ring groove being provided with a sealing ring for sealing with the damping adjustment rod (32); The adjusting portion (42) is located in the damping rod through-hole (51) and is adjacent to the sealing portion (511); the aperture of the sealing portion (511) is smaller than the aperture of the adjusting portion (42).

8. A shock absorber according to claim 1, characterized in that: The cylinder barrel (1) further comprises an end cover (12) and a base (13); the base (13) is sealingly connected to the other end of the cylinder barrel (1); the end cover (12) is assembled on one end of the cylinder barrel (1); the end cover (12) has a piston rod through hole (121) for the piston rod (3) to pass through; a limit baffle (122) is arranged on the inner wall of the piston rod through hole (121); the limit baffle (122) is used to limit the piston head (2) in the oil chamber (11).

9. A wheelbarrow with a shock absorber, comprising a wheel (6), a frame (7) movably connected up and down relative to the wheel (6), and a shock absorber according to any one of claims 1 to 8, characterized in that: The shock absorber is connected between the wheel (6) and the frame (7) to provide damping and shock absorption.

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