Shock absorber and monocycle

Abstract

The shock absorber comprises a shock-absorbing outer cylinder, a piston rod, a piston and an elastic piece, and the shock-absorbing outer cylinder is provided with a columnar inner cavity; the piston rod is arranged in the shock-absorbing outer cylinder in a sliding mode and arranged in the columnar inner cavity, at least one end of the piston rod penetrates out of one end of the shock-absorbing outer cylinder, the piston rod is fixedly sleeved with the piston, the columnar inner cavity is divided into a first liquid cavity and a second liquid cavity, the elastic piece is arranged in the second liquid cavity, and the piston rod or the piston is provided with an abutting part. One end of the elastic piece abuts against the abutting part, and the other end of the elastic piece abuts against the inner end of the shock-proof outer cylinder. According to the shock absorber, the piston rod is directly arranged on the shock-absorbing outer cylinder in a sliding mode, the shock-absorbing outer cylinder is directly used as an oil liquid cylinder, the elastic piece is installed on the piston rod and directly arranged in the columnar inner cavity of the shock-absorbing outer cylinder, and therefore built-in hiding of the elastic piece is achieved, the structure of the shock absorber is simplified, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of unicycles, in particular to a shock absorber and a unicycle. Background Art

[0002] A unicycle can be used as a means of transportation, as well as leisure and sports equipment. Riding a unicycle can improve the body's balance, coordination, and agility. It can also provide a full-body workout, improve cardiopulmonary function, and enhance concentration and reaction speed.

[0003] Generally, in order to improve riding comfort, most unicycles are equipped with shock absorbers, which can absorb impacts and vibrations, and can improve the stability and comfort of unicycle riding.

[0004] In the prior art, the shock absorbers used on unicycles mostly include an outer cylinder, a working oil cylinder, an oil storage cylinder, a piston rod, etc. For example, the patent application "Bidirectional shock absorber and shock absorption module" with application number 202410762784.5 published on July 26, 2024 has a relatively complex structure, is inconvenient to assemble, and has high cost. Utility Model Content

[0005] In order to overcome at least one of the defects described in the above-mentioned prior art, one of the purposes of the present utility model is to provide a shock absorber, in which the piston rod is directly slidably mounted on the shock-absorbing outer cylinder, the shock-absorbing outer cylinder is directly used as an oil cylinder, and the elastic part is installed inside the shock-absorbing outer cylinder, thereby simplifying the structure of the shock absorber, reducing costs, and reducing the outer diameter of the shock absorber.

[0006] In order to overcome at least one of the defects of the above-mentioned prior art, the second purpose of the present utility model is to provide a wheelbarrow, which adopts the above-mentioned shock absorber, has a good shock absorption effect, simplifies the assembly process of the wheelbarrow, and reduces the overall manufacturing cost of the wheelbarrow.

[0007] The technical solution adopted by the present invention to solve the problem is:

[0008] A shock absorber comprising:

[0009] A shock-absorbing outer cylinder, wherein the shock-absorbing outer cylinder has a cylindrical inner cavity;

[0010] a piston rod, the piston rod being slidably disposed in the cylindrical inner cavity of the shock-absorbing outer tube, and at least one end of the piston rod passing through one end portion of the shock-absorbing outer tube;

[0011] A piston, wherein the piston is fixedly sleeved on the outside of the piston rod and divides the cylindrical inner cavity into a first liquid cavity and a second liquid cavity;

[0012] An elastic member is arranged in the second liquid chamber, an abutment portion is provided on the piston rod or the piston, one end of the elastic member abuts against the abutment portion, and the other end of the elastic member abuts against the inner end of the shock-absorbing outer tube.

[0013] Furthermore, a first connecting seat is provided at one end of the shock-absorbing outer tube, and a second connecting seat is provided at the other end of the shock-absorbing outer tube. One end of the piston rod passes through the first connecting seat, the first liquid chamber is close to the first connecting seat, the second liquid chamber is close to the second connecting seat, and the end of the elastic member away from the abutting portion abuts against the second connecting seat.

[0014] Furthermore, the other end of the piston rod passes through the second connecting seat;

[0015] The elastic member is a columnar spring, which is sleeved on the outside of the piston rod. The abutment portion is a fixed seat relatively fixed to the piston rod. The fixed seat is placed in the second liquid chamber. The end of the columnar spring close to the piston is sleeved on the fixed seat and abuts against the fixed seat.

[0016] Furthermore, the fixing seat is sleeved on the piston rod and fixed against the piston, and an inclined avoidance surface is provided on a side of the fixing seat facing the piston.

[0017] Furthermore, the piston rod is sealed at both ends and hollow inside to form a liquid passage cavity. The piston rod is provided with a first liquid passage hole and a second liquid passage hole. The first liquid passage hole connects the first liquid cavity and the liquid passage cavity, and the second liquid passage hole connects the liquid passage cavity and the second liquid cavity.

[0018] Furthermore, a plurality of the first liquid passage holes and a plurality of the second liquid passage holes are respectively provided, and are uniformly arranged along the circumference of the piston rod.

[0019] Furthermore, the shock absorber further includes a damping adjustment rod;

[0020] The damping adjustment rod is disposed inside the piston rod and includes a first end and a second end; the first end extends from an end of the liquid passage chamber close to the first liquid chamber and is connected to the damping adjustment mechanism, and the outer peripheral surface of the second end contacts the first liquid passage hole or the second liquid passage hole;

[0021] The damping adjustment mechanism changes the position of the second end along the axial direction of the piston rod, thereby changing the effective liquid flow area of the first liquid flow hole or the second liquid flow hole.

[0022] Furthermore, the second end divides the liquid passage cavity into a first cavity and a second cavity, the first liquid passage hole is located in the first cavity, the second liquid passage hole is located in the second cavity, and the outer peripheral surface of the second end contacts the second liquid passage hole;

[0023] The second end is provided with a first one-way valve, and the first one-way valve conducts a liquid path from the second cavity to the first cavity;

[0024] It also includes a second one-way valve, which includes an overflow hole set on the piston and a valve plate that unidirectionally blocks the overflow hole. The second one-way valve conducts the liquid path from the first liquid chamber to the second liquid chamber.

[0025] Furthermore, the damping adjustment mechanism includes a threaded seat fixed relatively to the shock-absorbing outer cylinder, the first end passes through the threaded seat and is threadedly connected to the threaded seat, and the first end is threadedly connected to an adjustment handle.

[0026] A wheelbarrow comprises a hub motor, an upper body and the aforementioned shock absorber. The hub motor and the shock-absorbing outer cylinder are relatively fixedly connected, and the upper body and the piston rod are relatively fixedly connected.

[0027] In summary, the shock absorber provided by the present invention has the following technical effects:

[0028] 1. The shock absorber includes a shock-absorbing outer cylinder, which is directly used as an oil cylinder, and the piston rod is directly slidably installed in the shock-absorbing outer cylinder. The elastic part is installed on the piston rod and directly placed in the inner cavity of the shock-absorbing outer cylinder, so that the elastic part is hidden inside. Through the sliding of the piston rod and the elastic force of the elastic part, shock absorption and buffering effects are achieved, the use of the cylinder is reduced, the structural components of the shock absorber are reduced, the structure of the shock absorber is simplified, and the cost of the shock absorber is reduced. On the one hand, the radial size of the shock absorber is reduced, and on the other hand, the time for the elastic part to oxidize or rust is prolonged.

[0029] 2. Set the damping adjustment rod to adjust the damping of the piston rod to adjust the shock absorber's shock absorption capacity.

[0030] In summary, the unicycle provided by the present invention has the following technical effects:

[0031] The aforementioned shock absorber is adopted in the unicycle, which reduces the overall manufacturing cost of the unicycle and facilitates the control of the overall width of the wheelbarrow. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The figure is a schematic structural diagram of an embodiment of a shock absorber of the present utility model.

[0033] Figure 2 Schematic diagram of the connection between the piston rod and the piston.

[0034] Figure 3 Schematic diagram of the internal structure of the shock absorber.

[0035] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0036] The meanings of the reference numerals are as follows:

[0037] 1. Shock-absorbing outer tube; 10. Cylindrical inner cavity; 11. First liquid cavity; 12. Second liquid cavity; 13. First connecting seat; 14. Second connecting seat; 2. Piston rod; 21. First liquid hole; 22. Second liquid hole; 23. Liquid cavity; 3. Piston; 31. Overflow hole; 32. Valve plate; 4. Elastic member; 5. Fixed seat; 51. Inclined avoidance surface; 6. Damping adjustment rod; 61. First one-way valve; 611. First liquid guide hole; 612. Second liquid guide hole; 613. Spring; 614. Sealing ball; 62. Threaded seat; 63. Adjusting handle. DETAILED DESCRIPTION

[0038] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] 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", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limiting the present invention.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art 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.

[0041] See Figure 1 , the utility model discloses a shock absorber.

[0042] like Figure 2 and Figure 3 As shown, a shock absorber includes a shock-absorbing outer tube 1, a piston rod 2, a piston 3 and an elastic member 4.

[0043] The shock-absorbing outer cylinder 1 has a cylindrical inner cavity 10 .

[0044] The piston rod 2 is slidably disposed in the cylindrical inner cavity 10 of the shock-absorbing outer tube 1 , and at least one end of the piston rod 2 passes through one end portion of the shock-absorbing outer tube 1 .

[0045] The piston 3 is fixedly sleeved on the outside of the piston rod 2 and divides the cylindrical inner cavity 10 into a first liquid cavity 11 and a second liquid cavity 12 .

[0046] The elastic member 4 is arranged in the second liquid chamber 12 , and an abutting portion is provided on the piston rod 2 or the piston 3 . One end of the elastic member 4 abuts against the abutting portion, and the other end of the elastic member 4 abuts against the inner end of the shock-absorbing outer tube 1 .

[0047] Based on the above scheme, the shock absorber only has one cylinder body, the shock-absorbing outer cylinder 1, and the shock-absorbing outer cylinder 1 is also used as an oil cylinder. The piston rod 2 slides in the cylindrical inner cavity 10 of the shock-absorbing outer cylinder 1, so that the piston 3 moves synchronously, changing the proportion of the first liquid cavity 11 and the second liquid cavity 12 in the cylindrical inner cavity 10 inside the shock-absorbing outer cylinder 1, that is, changing the size of the first liquid cavity 11 and the second liquid cavity 12, so that the hydraulic oil is transferred between the first liquid cavity 11 and the second liquid cavity 12, thereby achieving the purpose of buffering and shock absorption.

[0048] Based on the above solution, the shock absorber has only one cylinder, the shock-absorbing outer cylinder 1, which also serves as an oil cylinder, thereby reducing the use of cylinders, reducing the structural components of the shock absorber, simplifying the structure of the shock absorber, and reducing the cost of the shock absorber.

[0049] Based on the above solution, during or after assembly of the shock absorber, the first fluid chamber 11, the second fluid chamber 12, and the transition fluid chamber 23 are all filled with hydraulic oil, or with a specified or constant amount of hydraulic oil. The amount of hydraulic oil filled is determined to ensure that when the piston 3 moves with the piston rod 2, the hydraulic oil can be transferred between the first fluid chamber 11 and the second fluid chamber 12, thereby cushioning the movement of the piston rod 2 and achieving a shock-absorbing effect.

[0050] In this technical solution, the shock absorber further includes an elastic member 4 , which is placed in the second liquid chamber 12 . The piston 3 compresses or releases the elastic member 4 as the piston rod 2 moves.

[0051] like Figure 3 As shown, Figure 3 From the perspective of , the piston 3 moves downward with the piston rod 2, compressing the elastic member 4. At this time, the elastic member 4 provides damping for the movement of the piston rod 2. The elastic member 4 absorbs and cushions the movement of the piston rod 2, thereby achieving a shock-absorbing effect.

[0052] Therefore, in summary, in this technical solution, the elastic member 4 is arranged in the second liquid chamber 12, and when the piston rod 2 is forced to move toward the second liquid chamber 12, the elastic member 4 will be compressed, thereby achieving a shock-absorbing effect. It can be understood that if the force sliding direction of the piston rod 2 changes, such as the piston rod 2 is forced to move toward the first liquid chamber 11, the elastic member 4 can be arranged in the first liquid chamber 11 at this time, and when the piston rod 2 moves toward the first liquid chamber 11, the elastic member 4 will be compressed, thereby achieving a shock-absorbing effect. The setting of the elastic member 4 can be set according to the shock-absorbing direction of the shock absorber, and it is not necessary to be set in the second liquid chamber 12. In this solution, the elastic member 4 is selected to be set in the second liquid chamber 12, and the piston 3 and piston rod 2 in the shock absorber move toward the second liquid chamber 12 to achieve a shock-absorbing effect.

[0053] Based on the above solution, the elastic member 4 is installed within the shock-absorbing outer cylinder 1, achieving internal concealment of the elastic member. This eliminates the need for an additional outer cylinder, thus reducing the number of cylinders used. This reduces the number of structural components in the shock absorber, simplifies the shock absorber structure, and reduces the cost of the shock absorber. It also facilitates reducing the radial dimension of the shock absorber, achieving miniaturization. Furthermore, the elastic member 4 is installed in the second liquid chamber 12 and immersed in the hydraulic oil in the second liquid chamber 12, which prolongs the time it takes for the elastic member 4 to oxidize and rust, thereby extending the service life of the elastic member 4.

[0054] In this technical solution, a first connecting seat 13 is provided at one end of the shock-absorbing outer tube 1, and a second connecting seat 14 is provided at the other end of the shock-absorbing outer tube 1. One end of the piston rod 2 passes through the first connecting seat 13, the first liquid chamber 11 is close to the first connecting seat 13, the second liquid chamber 12 is close to the second connecting seat 14, and the end of the elastic member 4 away from the abutting portion abuts against the second connecting seat 14.

[0055] like Figure 2 As shown, the piston rod 2 passes through the first connecting seat 13, and the elastic member 4 is disposed in the second liquid chamber 12. One end of the elastic member 4 moves with the piston 3 or piston rod 2, and the other end is fixed to the inner end of the shock-absorbing outer tube 1. That is, one end of the elastic member 4 abuts against the abutment portion, and the end of the elastic member 4 away from the abutment portion abuts against the second connecting seat 14. In this way, when the piston 3 and piston rod 2 move toward the second liquid chamber 12, the elastic member 4 is restrained by the second connecting seat 14 and compressed by the abutment portion, thereby buffering and reducing the movement of the piston rod 2.

[0056] In the above scheme, the first connecting seat 13 and the second connecting seat 14 respectively realize the closure of the two ends of the shock-absorbing outer tube 1, so that the shock-absorbing outer tube 1 obtains a cylindrical inner cavity, and at the same time provides space for the piston rod 2 to pass through, so that the piston rod 2 can pass through the shock-absorbing outer tube 1.

[0057] In one embodiment of the present invention, one end of the piston rod 2 extends from the first connecting seat 13, and the other end of the piston rod extends from the second connecting seat 14. This provides a greater effective displacement for the movement of the piston rod 2, so that when the piston rod 2 is used to achieve shock absorption, it can have a better shock absorption effect, so that the wheelbarrow using the shock absorber can adapt to driving on more bumpy roads.

[0058] The elastic member 4 is a columnar spring with a simple structure, low cost, convenient and quick installation, and good energy absorption effect when working.

[0059] The cylindrical spring is sleeved on the outside of the piston rod 2, and the abutting part is a fixed seat 5 relatively fixed to the piston rod 2. The fixed seat 5 is placed in the second liquid chamber 12, and the end of the cylindrical spring close to the piston 3 is sleeved on the fixed seat 5 and abuts against the fixed seat 5.

[0060] One end of the cylindrical spring is directly or indirectly fixed to the piston rod 2 and piston 3, while the other end abuts the inner end of the shock-absorbing outer tube 1. One end of the cylindrical spring is always fixed to the inner end of the shock-absorbing outer tube 1, while the other end is directly or indirectly fixed to the piston 3 or piston rod 2. As the piston 3 and piston rod 2 move, they are compressed or released, achieving energy absorption or rebound reset. The cylindrical spring is provided to help the piston rod 2 rebound and reset, allowing it to rebound quickly and prepare for the next buffering and energy absorption.

[0061] In the present technical solution, the fixing seat 5 is sleeved on the piston rod and fixed against the piston 3, thereby facilitating the installation of the fixing seat 5 and utilizing the piston 3 to provide support force. The end of the columnar spring close to the piston 3 is fixedly sleeved on the fixing seat 5. The provision of the fixing seat 5 facilitates the installation of the columnar spring and prevents the columnar spring from directly contacting the piston 3, causing friction on the piston 3, affecting the performance of the piston 3, and causing failure of the piston 3. In addition, the connection between the columnar spring and the fixing seat 5 also prevents the columnar spring from blocking the overflow hole 31 on the piston, ensuring that when the piston rod 2 rebounds, the hydraulic oil in the first liquid chamber 11 can be smoothly transferred to the second liquid chamber 12, ensuring the smooth rebound of the piston rod 2.

[0062] In addition, the fixing seat 5 is provided to fix the cylindrical spring relative to the piston rod 2 in the radial direction, thereby avoiding friction between the cylindrical spring and the outer wall of the piston rod 2, which affects the service life and performance of the cylindrical spring or the piston rod 2.

[0063] In one embodiment, an inclined avoidance surface 51 is provided on the side of the fixing seat 5 facing the piston 3. Based on the above solution, that is, the fixing seat 5 is provided at the end of the piston 3 facing the second liquid chamber 12, and the inclined avoidance surface 51 is provided on the side of the fixing seat 5 facing the piston 3. The inclined avoidance surface 51 avoids the valve disc 32, ensuring that the overflow hole 31 is smoothly opened and conductive. At the same time, the inclined avoidance surface 51 can also limit the valve disc 32, preventing the valve disc 32 from being over-opened and difficult to reset.

[0064] In this technical solution, both ends of the piston rod 2 are sealed and the interior is hollow to form a liquid passage cavity 23. A first liquid passage hole 21 and a second liquid passage hole 22 are provided on the piston rod 2. The first liquid passage hole 21 connects the first liquid cavity 11 and the liquid passage cavity 23, and the second liquid passage hole 22 connects the liquid passage cavity 23 and the second liquid cavity 12.

[0065] When the shock absorber is operating, the piston rod 2 slides downward, compressing the space in the second liquid chamber 12. A portion of the hydraulic oil originally in the second liquid chamber 12 flows through the second liquid hole 22 into the liquid hole 23, and then from the liquid hole 23 into the first liquid chamber 11 through the first liquid hole 21. As the piston rod 2 moves upward, the space in the first liquid chamber 11 is compressed, and the space in the second liquid chamber 12 is released. At this time, the hydraulic oil in the first liquid chamber 11 is transferred to the second liquid chamber 12. During this process of hydraulic oil from the first liquid chamber 11 to the second liquid chamber 12, the hydraulic oil can flow in the reverse direction through the liquid hole 23. That is, the oil in the first liquid chamber 11 enters the liquid hole 23 through the first liquid hole 21, and then enters the second liquid chamber 12 through the second liquid hole 22. Of course, the hydraulic oil can also flow into the second liquid chamber 12 through other locations within the shock absorber outer tube 1, such as directly through the piston.

[0066] Based on the above scheme and the working principle of the shock absorber, when the piston rod 2 and the piston 3 move, the hydraulic oil is transferred. Since the hydraulic oil is transferred through the first liquid hole 21 and / or the second liquid hole 22, the apertures of the first liquid hole 21 and the second liquid hole 22 are both small, so the hydraulic oil can absorb part of the movement of the piston rod, thereby achieving the damping effect and purpose.

[0067] In this technical solution, a plurality of first and second fluid holes 21, 22 are provided, and are evenly spaced along the circumference of the piston rod 2. The even placement of the first and second fluid holes 21, 22 along the circumference of the piston rod 2 allows multiple holes in each of the first and second fluid holes 21, 22 to participate in the hydraulic oil transfer process, facilitating uniform passage of the hydraulic oil, improving the hydraulic oil flow efficiency, and ensuring the damping performance of the shock absorber.

[0068] In this technical solution, the shock absorber further includes a damping adjustment rod 6, which adjusts the flow rate of the hydraulic oil during the transfer process to achieve the adjustment of the vibration absorption capacity of the piston rod 2.

[0069] like Figure 3 and Figure 4 As shown, the damping adjustment rod 6 is disposed within the piston rod 2 and includes a first end and a second end. The first end extends from the end of the liquid passage chamber 23 near the first liquid chamber 11 and is connected to the damping adjustment mechanism. The outer circumference of the second end contacts the first liquid passage hole 21 or the second liquid passage hole 22.

[0070] The damping adjustment mechanism changes the position of the second end of the piston rod 2 along its axial direction, thereby altering the effective fluid flow area of the first or second fluid flow hole 21, 22. By adjusting the position of the second end of the damping adjustment rod within the fluid flow chamber of the piston rod through the damping adjustment mechanism, the damping adjustment rod blocks the first or second fluid flow hole 21, 22 to varying degrees, changing the effective fluid flow area of the first or second fluid flow hole 21, 22. This, in turn, changes the flow rate of the hydraulic oil and, consequently, the damping of the piston rod 2. By adjusting the damping of the piston rod 2, the shock absorber's damping capacity and instantaneous damping amplitude are altered, allowing a unicycle equipped with this shock absorber to adapt to different driving environments.

[0071] The second end divides the liquid flow chamber 23 into a first chamber and a second chamber. The first liquid flow hole 21 is located in the first chamber, and the second liquid flow hole 22 is located in the second chamber. The outer peripheral surface of the second end contacts the second liquid flow hole 22. When the piston 3 and the piston rod 2 move toward the second liquid chamber 12, the oil in the second liquid chamber 12 enters the liquid flow chamber 23 through the second liquid flow hole 22. The damping adjustment rod 6 adjusts the liquid flow area of the second liquid flow hole 22, thereby changing the flow rate of the oil in the second liquid chamber 12 through the second liquid flow hole 22, directly changing the damping. Compared with adjusting the first liquid flow hole 21, the damping adjustment rod 6 directly adjusts the second liquid flow hole 22, making the damping feedback more direct and the error smaller.

[0072] A first one-way valve 61 is provided at the second end, and the first one-way valve 61 conducts the liquid path from the second chamber to the first chamber. Figure 3 As shown, the piston rod 2 slides downward, the capacity of the second liquid chamber 12 is compressed by the piston, the hydraulic pressure in the second liquid chamber 12 increases, and the hydraulic oil in the second liquid chamber 12 enters the liquid chamber 23 through the second liquid hole 22, specifically into the space between the second end of the damping adjusting rod 6 and the bottom end of the liquid chamber 23. At this time, the hydraulic pressure in this space increases, and the hydraulic pressure will actively squeeze the first one-way valve 61, so that the first one-way valve 61 opens, and the hydraulic oil circuit between the second liquid chamber 12 and the first liquid chamber 11 is opened, and the hydraulic oil is transferred from the second liquid chamber 12 to the first liquid chamber 11.

[0073] like Figure 4As shown, the first one-way valve 61 is an automatic opening and closing one-way valve, including a first liquid guide hole 611, a second liquid guide hole 612, a spring 613, and a blocking ball 614. When the hydraulic pressure in the second liquid chamber 12 increases, the blocking ball 614 is squeezed, and the blocking ball 614 squeezes the spring 613, thereby achieving conductivity between the first liquid guide hole 611 and the second liquid guide hole 612. Hydraulic oil can enter the first liquid chamber 11 from the second liquid chamber 12, thereby absorbing the vibration or movement of the piston rod 2. Conversely, when the hydraulic pressure in the first liquid chamber 11 increases, the hydraulic oil cannot reversely push the blocking ball 614 to squeeze the spring 613, and the first one-way valve 61 is closed.

[0074] When the piston rod 2 rebounds upward, the first one-way valve 61 becomes inoperable. At this point, the hydraulic oil in the first fluid chamber 11 needs to flow into the second fluid chamber 12. To achieve this, a second one-way valve is also provided within the shock absorber. The second one-way valve comprises an overflow hole 31 provided on the piston 3 and a valve plate 32 that one-way blocks the overflow hole 31. The second one-way valve allows fluid to flow from the first fluid chamber 11 to the second fluid chamber 12.

[0075] Based on the above solution, when the hydraulic pressure in the first liquid chamber 11 increases to a certain value, the hydraulic oil in the first liquid chamber 11 will flush the second one-way valve, so that the first liquid chamber 11 and the second liquid chamber 12 are connected. Figure 3 As shown, when the hydraulic pressure in the first liquid chamber 11 increases, the hydraulic oil pushes down to open the valve plate 32, the bottom end of the overflow hole 31 is opened, the overflow hole 31 is connected, and the hydraulic oil can be transferred. In the above solution, the second one-way valve has a simple structure and can achieve oil return.

[0076] Based on the above solution, the first one-way valve 61 conducts the downward shock-absorbing oil circuit, and the second one-way valve conducts the piston rod rebound oil circuit. The first one-way valve 61 and the second one-way valve work in sequence to complete a complete shock-absorbing process.

[0077] In this technical solution, the damping adjustment mechanism includes a threaded seat 62 fixed relative to the shock-absorbing outer tube 1. The first end extends through the threaded seat 62 and is threadedly connected to the threaded seat 62. The first end is also threadedly connected to the adjustment handle 63. During adjustment, the adjustment handle 63 is rotated, and the damping adjustment rod 6 moves relative to the threaded seat 62. The second end then moves axially along the piston rod 2, adjusting the amount of blockage of the first liquid passage hole 21 or the second liquid passage hole 22, thereby adjusting the piston rod damping. The adjustment operation is simple and convenient.

[0078] This technical solution also proposes a unicycle comprising pedals, a hub motor, an upper body, and the aforementioned shock absorber. The hub motor and the shock-absorbing outer cylinder are relatively fixedly connected, and the upper body and one end of the piston rod are relatively fixedly connected. Furthermore, the upper body can be fixedly connected to a battery box, and the pedals can be fixedly connected to the battery box or the other end of the piston rod. This unicycle utilizes the aforementioned shock absorber, reducing the overall manufacturing cost of the unicycle and facilitating control of the overall width of the unicycle.

[0079] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A shock absorber, characterized in that: include: A shock-absorbing outer cylinder, wherein the shock-absorbing outer cylinder has a cylindrical inner cavity; a piston rod, the piston rod being slidably disposed in the cylindrical inner cavity of the shock-absorbing outer tube, and at least one end of the piston rod passing through one end portion of the shock-absorbing outer tube; A piston, wherein the piston is fixedly sleeved on the outside of the piston rod and divides the cylindrical inner cavity into a first liquid cavity and a second liquid cavity; An elastic member is arranged in the second liquid chamber, an abutment portion is provided on the piston rod or the piston, one end of the elastic member abuts against the abutment portion, and the other end of the elastic member abuts against the inner end of the shock-absorbing outer tube.

2. The shock absorber according to claim 1, characterized in that A first connecting seat is provided at one end of the shock-absorbing outer tube, and a second connecting seat is provided at the other end of the shock-absorbing outer tube. One end of the piston rod passes through the first connecting seat, the first liquid chamber is close to the first connecting seat, the second liquid chamber is close to the second connecting seat, and the end of the elastic member away from the abutting portion abuts against the second connecting seat.

3. The shock absorber according to claim 2, characterized in that The other end of the piston rod passes through the second connecting seat; The elastic member is a columnar spring, which is sleeved on the outside of the piston rod. The abutment portion is a fixed seat relatively fixed to the piston rod. The fixed seat is placed in the second liquid chamber. The end of the columnar spring close to the piston is sleeved on the fixed seat and abuts against the fixed seat.

4. The shock absorber according to claim 3, characterized in that The fixing seat is sleeved on the piston rod and fixed against the piston, and an inclined avoidance surface is provided on a side of the fixing seat facing the piston.

5. The shock absorber according to any one of claims 1 to 4, characterized in that The piston rod is sealed at both ends and hollow inside to form a liquid passage cavity. The piston rod is provided with a first liquid passage hole and a second liquid passage hole. The first liquid passage hole connects the first liquid cavity and the liquid passage cavity, and the second liquid passage hole connects the liquid passage cavity and the second liquid cavity.

6. The shock absorber according to claim 5, characterized in that A plurality of the first liquid passage holes and the second liquid passage holes are respectively provided, and are uniformly arranged along the circumference of the piston rod.

7. The shock absorber according to claim 5, characterized in that Also included is a damping adjustment lever; The damping adjustment rod is disposed inside the piston rod and includes a first end and a second end; the first end extends from an end of the liquid passage chamber close to the first liquid chamber and is connected to the damping adjustment mechanism, and the outer peripheral surface of the second end contacts the first liquid passage hole or the second liquid passage hole; The damping adjustment mechanism changes the position of the second end along the axial direction of the piston rod, thereby changing the effective liquid flow area of the first liquid flow hole or the second liquid flow hole.

8. The shock absorber according to claim 7, characterized in that The second end divides the liquid passage cavity into a first cavity and a second cavity, the first liquid passage hole is located in the first cavity, the second liquid passage hole is located in the second cavity, and the outer peripheral surface of the second end contacts the second liquid passage hole; The second end is provided with a first one-way valve, and the first one-way valve conducts a liquid path from the second cavity to the first cavity; It also includes a second one-way valve, which includes an overflow hole set on the piston and a valve plate that unidirectionally blocks the overflow hole. The second one-way valve conducts the liquid path from the first liquid chamber to the second liquid chamber.

9. The shock absorber according to claim 7, characterized in that The damping adjustment mechanism includes a threaded seat fixed relatively to the shock-absorbing outer cylinder, the first end passes through the threaded seat and is threadedly connected to the threaded seat, and the first end is threadedly connected to an adjustment handle.

10. A wheelbarrow, characterized in that: It comprises a hub motor, an upper body, a pedal and the shock absorber according to any one of claims 1 to 9, wherein the hub motor and the shock-absorbing outer cylinder are relatively fixedly connected, and the upper body and the piston rod are relatively fixedly connected.

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