Shock absorber and monocycle

Abstract

The shock absorber comprises a working fluid cylinder, a piston rod, a piston and a plugging piece, the piston rod is arranged in the working fluid cylinder in a sliding mode, the two ends of the piston rod penetrate out of the two ends of the working fluid cylinder respectively, and the piston rod is hollow and forms a fluid passing cavity; the piston fixedly sleeves the piston rod and divides the interior of the working liquid cylinder into a first liquid cavity and a second liquid cavity, and a first liquid passing hole and a second liquid passing hole are formed in the piston rod; the plugging piece is at least fixedly arranged at one end of the columnar inner cavity and slidably arranged outside the piston rod in a sleeving mode, and when the second liquid passing hole and / or the first liquid passing hole move to the position of the plugging piece, the plugging piece plugs the second liquid passing hole and / or the first liquid passing hole. According to the shock absorber, the anti-collision mechanism is arranged, when the piston rod drives the piston to move to the position of the anti-collision mechanism, a hydraulic oil way is cut off, at the moment, damping of hydraulic oil to the piston and the piston rod is increased, the piston rod and the piston are difficult to continue to move, and collision between the piston and the end of the working fluid cylinder is avoided.

Description

Technical Field

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

[0002] On a unicycle, the main function of the shock absorber is to absorb the impact and vibration caused by uneven road conditions, thereby improving riding stability and comfort. The working principle of the shock absorber is mainly through the reciprocating motion of the internal piston rod and piston in the cylinder filled with damping oil, using the damping force generated by the oil through the valve to absorb vibration.

[0003] When driving, the greater the bumps on the road, the greater the distance the piston moves and the greater the reciprocating distance. When the limit is exceeded, the piston may bottom out or top out, that is, the piston moves quickly or instantly to the end limit position of the cylinder, causing a collision and affecting the overall performance and service life of the shock absorber. Summary of the invention

[0004] In order to overcome at least one of the defects described in the above-mentioned prior art, one of the objects of the present invention is to provide a shock absorber. In the shock absorber, an anti-collision mechanism is arranged. When the piston rod drives the piston to move to the position of the anti-collision mechanism, the hydraulic oil circuit is cut off. At this time, the damping of the hydraulic oil on the piston and the piston rod increases, and the piston rod and the piston are difficult to continue moving, thereby avoiding the collision between the piston and the end of the working fluid cylinder.

[0005] In order to overcome at least one defect of the above-mentioned prior art, the second purpose of the present invention is to provide a wheelbarrow. The aforementioned shock absorber is applied to the wheelbarrow. When the wheelbarrow is traveling on a bumpy road, the shock absorber will not bottom out or top out, thereby ensuring the safety of the shock absorber, extending the service life of the shock absorber, and achieving shock absorption and buffering effects.

[0006] The technical solution adopted by the present invention to solve the problem is:

[0007] A shock absorber, comprising:

[0008] A working fluid cylinder, wherein the working fluid cylinder has a cylindrical inner cavity;

[0009] A piston rod, wherein the piston rod is slidably disposed in the columnar inner cavity of the working fluid cylinder, and the two ends of the piston rod are respectively passed through the two ends of the working fluid cylinder, the two ends of the piston rod are sealed and the interior is hollow to form a liquid passage cavity;

[0010] A piston, wherein the piston fixed sleeve is arranged outside the piston rod and divides the columnar inner cavity into a first liquid cavity and a second liquid cavity, and the piston rod located in the first liquid cavity and the second liquid cavity is provided with a first liquid hole and a second liquid hole respectively; the first liquid hole connects the first liquid cavity and the liquid cavity, and the second liquid hole connects the liquid cavity and the second liquid cavity;

[0011] An anti-collision mechanism, the anti-collision mechanism comprising a blocking member, the blocking member being fixedly arranged at least at one end of the cylindrical inner cavity and slidably arranged outside the piston rod;

[0012] When the first liquid passage hole moves to the position of the blocking member, the blocking member blocks the first liquid passage hole, cutting off the oil passage between the first liquid chamber and the liquid passage chamber, and / or, when the second liquid passage hole moves to the position of the blocking member, the blocking member blocks the second liquid passage hole, cutting off the oil passage between the second liquid chamber and the liquid passage chamber.

[0013] Furthermore, the sealing member includes a guide ring, which is fixedly installed at the end of the columnar inner cavity, the piston rod is slidably connected to the guide ring, and the end of the piston rod penetrates the first liquid cavity or the second liquid cavity through the guide ring, so that the end of the piston rod extends out of the columnar inner cavity.

[0014] Furthermore, a blocking seat is fixed to at least one end of the columnar inner cavity, and the blocking member is fixedly mounted to the blocking seat.

[0015] Furthermore, the blocking member is provided with two and is respectively fixed to the end of the first liquid chamber away from the second liquid chamber and the end of the second liquid chamber away from the first liquid chamber. When the piston rod moves to a preset position, the first liquid hole is blocked by the blocking member in the first liquid chamber, or the second liquid hole is blocked by the blocking member in the second liquid chamber.

[0016] Furthermore, a shock-absorbing elastic member is connected to the piston rod, and the shock-absorbing elastic member provides shock-absorbing elastic force for the piston rod.

[0017] Furthermore, the shock-absorbing elastic member includes a shock-absorbing spring, which is sleeved on the piston rod and located in the second liquid chamber;

[0018] One end of the shock absorbing spring is connected to the piston, and the other end is fixed to the end of the second liquid chamber away from the first liquid chamber.

[0019] 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.

[0020] Furthermore, the shock absorber further includes a damping adjustment rod;

[0021] The damping adjustment rod is arranged inside the piston rod and includes a first end and a second end; the first end extends from the end of the liquid passage cavity close to the first liquid cavity and is connected to the damping adjustment mechanism, and the outer peripheral surface of the second end is in contact with the first liquid passage hole or the second liquid passage hole;

[0022] The damping adjustment mechanism changes the position of the second end along the axial direction of the piston rod, thereby changing the effective liquid passing area of ​​the first liquid passing hole or the second liquid passing hole.

[0023] Furthermore, the second end divides the liquid passage cavity into a first cavity and a second cavity, the first cavity is connected to the first liquid cavity through the first liquid passage hole, and the second cavity is connected to the second liquid cavity through the second liquid passage hole;

[0024] The second end is provided with a first one-way valve; the first one-way valve is a one-way oil passage connecting the second chamber to the first chamber;

[0025] The shock absorber further comprises a second one-way valve, which unidirectionally conducts the oil passage from the first liquid chamber to the second liquid chamber;

[0026] The second one-way valve comprises an overflow hole arranged on the piston and a valve plate for one-way blocking the overflow hole.

[0027] A wheelbarrow is provided with the aforementioned shock absorber.

[0028] In summary, the shock absorber provided by the present invention has the following technical effects:

[0029] 1. A blocking member constituting an anti-collision mechanism is arranged in the working fluid cylinder, so that when the first liquid hole and the second liquid hole move with the piston rod, when the first liquid hole or the second liquid hole moves to the position of the blocking member, the first liquid hole or the second liquid hole is blocked, the oil passage between the first liquid chamber and the liquid passage chamber is cut off, or the oil passage between the second liquid chamber and the liquid passage chamber is cut off, so as to prevent the piston from continuing to move, or slow down the speed of the piston movement, so as to prevent the piston from colliding with the end of the first liquid chamber or the second liquid chamber, thereby ensuring the safety of the shock absorber.

[0030] 2. Set the damping adjustment rod to adjust the damping of the piston rod to adjust the shock absorber's shock absorbing capacity.

[0031] In summary, the unicycle provided by the present invention has the following technical effects:

[0032] The unicycle adopts the aforementioned shock absorber, which has a good shock absorption effect and can be ridden on relatively bumpy roads without causing damage to the shock absorber, thereby extending the service life of the shock absorber and reducing the use cost of the unicycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The figure is a schematic structural diagram of an embodiment of a shock absorber of the present invention.

[0034] Figure 2 It is a schematic diagram of the connection between the piston rod and the sealing member.

[0035] Figure 3 Schematic diagram of the internal structure of the shock absorber.

[0036] Figure 4 This is a partial enlarged view of the sealing part.

[0037] Figure 5 This is a schematic diagram of the state in which the sealing member seals the second liquid passage hole.

[0038] The meanings of the reference numerals are as follows:

[0039] 1. Working fluid cylinder; 10. Columnar inner cavity; 11. First liquid cavity; 12. Second liquid cavity; 2. Piston rod; 21. Liquid cavity; 22. First liquid hole; 23. Second liquid hole; 3. Anti-collision mechanism; 31. Blocking member; 32. Blocking seat; 4. Piston; 41. Overflow hole; 42. Valve plate; 5. Shock-absorbing elastic member; 6. Fixed seat; 61. Inclined avoidance surface; 7. Damping adjustment rod; 71. First one-way valve; 711. First liquid guide hole; 712. Second liquid guide hole; 713. Spring; 714. Blocking ball; 72. Threaded seat; 73. Adjustment handle. DETAILED DESCRIPTION

[0040] 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.

[0041] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships 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.

[0042] 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 in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0043] See also Figure 1 and Figure 2 , the present invention discloses a shock absorber.

[0044] A shock absorber comprises a working fluid cylinder 1, a piston rod 2, a piston 4 and an anti-collision mechanism 3.

[0045] The working fluid cylinder 1 has a cylindrical inner cavity 10 .

[0046] The piston rod 2 is slidably disposed in the columnar inner cavity 10 of the working fluid cylinder 1 , and both ends of the piston rod 2 pass through the two ends of the working fluid cylinder 1 respectively. Both ends of the piston rod 2 are sealed and the interior is hollow to form a liquid passage cavity 21 .

[0047] The piston 4 is fixedly sleeved on the outside of the piston rod 2, and divides the columnar inner cavity 10 into a first liquid cavity 11 and a second liquid cavity 12, and the piston rod 2 located in the first liquid cavity 11 and the second liquid cavity 12 is respectively provided with a first liquid hole 22 and a second liquid hole 23. The first liquid hole 22 connects the first liquid cavity 11 and the liquid cavity 21, and the second liquid hole 23 connects the liquid cavity 21 and the second liquid cavity 12.

[0048] The anti-collision mechanism 3 includes a blocking member 31 . The blocking member 31 is fixed to at least one end of the cylindrical inner cavity 10 and is slidably sleeved on the outside of the piston rod 2 .

[0049] When the first liquid hole 22 moves to the position of the blocking member 31, the blocking member 31 blocks the first liquid hole 22, cutting off the oil passage between the first liquid chamber 11 and the liquid passage chamber 21, and / or, when the second liquid hole 23 moves to the position of the blocking member 31, the blocking member 31 blocks the second liquid hole 23, cutting off the oil passage between the second liquid chamber 12 and the liquid passage chamber 21.

[0050] Based on the above scheme, the piston rod 2 is slidably arranged inside the columnar inner cavity of the working fluid cylinder 1, and the two ends of the piston rod 2 are respectively passed through the two ends of the working fluid cylinder 1, providing a larger space and stroke for the sliding of the piston rod 2, increasing the stroke of the shock absorber, so that the shock absorber can cope with greater bumpy road conditions, and improve the adaptability of the unicycle using the shock absorber.

[0051] Based on the above technical solution, on the basis of the solution based on which the two ends of the piston rod 2 respectively pass through the two ends of the working fluid cylinder 1, an anti-collision mechanism 3 is additionally provided. The anti-collision mechanism 3 is used to prevent the piston rod 2 and the piston 4 from colliding in the first liquid chamber 11 or the second liquid chamber 12 during the sliding process.

[0052] In the above scheme, the anti-collision mechanism 3 adopts a sealing member 31. During the synchronous sliding process of the piston rod 2 and the piston 4, when the first liquid hole 22 moves to the position of the sealing member 31, the sealing member 31 blocks the first liquid hole 22, cutting off the oil passage between the first liquid chamber 11 and the liquid passage chamber 21, and / or, when the second liquid hole 23 moves to the position of the sealing member 31, the sealing member 31 blocks the second liquid hole 23, cutting off the oil passage between the second liquid chamber 12 and the liquid passage chamber 21. That is, the sealing member 31 seals the first liquid hole 22 or the second liquid hole 23 on the piston rod 2, so that when the piston 4 approaches the end of the first liquid chamber 11 away from the second liquid chamber 12 or approaches the end of the second liquid chamber 12 away from the first liquid chamber 11, the hydraulic oil can no longer pass through the first liquid hole 22 or the second liquid hole 23, the first liquid chamber 11 or the second liquid chamber 12 can not be further compressed, the piston rod 2 and the piston 4 move to the allowable limit position, the piston 4 and the piston rod 2 will not continue to move, and the piston 4 will not collide with the end of the first liquid chamber 11 or the end of the second liquid chamber 12, thereby avoiding damage to the piston 4 and protecting the integrity of the shock absorber and good shock absorption performance.

[0053] like Figure 2 As shown, the blocking member 31 of the anti-collision mechanism 3 can be arranged in the first liquid chamber 11 to prevent the piston 4 from colliding with the end of the first liquid chamber 11 away from the second liquid chamber 12, or can be arranged in the second liquid chamber 12 to prevent the piston 4 from colliding with the end of the second liquid chamber 12 away from the first liquid chamber 11, or can be arranged in both the first liquid chamber 11 and the second liquid chamber 12. When the piston 4 slides in the first liquid chamber 11 and the second liquid chamber 12, it will not collide with the ends of the first liquid chamber 11 and the second liquid chamber 12.

[0054] In the present technical solution, the sealing member 31 includes a guide ring, which is fixedly installed at the end of the columnar inner cavity 10, the piston rod 2 is slidably connected to the guide ring, and the end of the piston rod 2 penetrates the first liquid cavity 11 or the second liquid cavity 12 through the guide ring, so that the end of the piston rod extends out of the columnar inner cavity 10.

[0055] The plugging member 31 adopts a guide ring, which can be completely sleeved and wrapped around the outside of the piston rod 2, so as to achieve the blocking of the first liquid hole 22 or the second liquid hole 23 on the piston rod 2, and at the same time, seal and block the two ends of the working fluid cylinder 1. In addition, the plugging member 31 adopts a guide ring, which can reduce the friction on the piston rod 2, extend the service life of the piston rod 2, and ensure the sealing effect of the plugging member 31.

[0056] In the technical solution, a blocking seat 32 is fixed to at least one end of the columnar inner cavity 10, and the blocking member 31 is fixedly installed with the blocking seat 32. The blocking seat 32 is provided to achieve the installation of the blocking member 31. Of course, if the blocking member 31 is provided at only one end of the columnar inner cavity 10, the blocking member 31 is installed at this end by providing the blocking seat 32. If the blocking members 31 are provided at both ends of the columnar inner cavity 10, the blocking seats 32 are provided at both ends of the columnar inner cavity 10 to respectively achieve the installation of the two blocking members 31. Of course, when the blocking member 31 is provided at only one end of the columnar inner cavity 10, the blocking seat 32 can also be provided at the other end of the columnar inner cavity 10. The blocking seat 32 realizes the sealing of the end of the columnar inner cavity 10, and the piston rod 2 passes through the blocking seat 32, and the blocking seat 32 also realizes the sealing of the space between the piston rod 2 and the columnar inner cavity 10.

[0057] In this technical solution, if Figure 2 and Figure 3 As shown, two blocking members 31 are provided and are respectively fixed to the end of the first liquid chamber 11 away from the second liquid chamber and the end of the second liquid chamber 12 away from the first liquid chamber, that is, the two blocking members 31 are respectively located at the two ends of the columnar inner cavity 10. When the piston rod 2 moves, the first liquid hole 22 is blocked by the blocking member 31 in the first liquid chamber 11, or the second liquid hole 23 is blocked by the blocking member 31 in the second liquid chamber 12.

[0058] There are two blocking members 31, and when the piston rod 2 moves to the preset position, the first liquid hole 22 is blocked by the blocking member 31 in the first liquid chamber 11, or the second liquid hole 23 is blocked by the blocking member 31 in the second liquid chamber 12. The preset position here is generally set according to the stroke of the piston rod 2, or the corresponding distance moved by the piston rod 2 when the piston 4 moves from the first liquid hole 22 to the position of the blocking member 31 in the first liquid chamber 11, or the corresponding distance moved by the piston rod 2 when the piston 4 moves from the second liquid hole 23 to the position of the blocking member 31 in the second liquid chamber 12.

[0059] Based on the above scheme, if Figures 3 to 5 As shown, after the shock absorber is installed, it is in a vertical state or a substantially vertical state, and the two blocking members 31 are respectively arranged at the top and bottom of the columnar inner cavity 10. When the shock absorber is working, when the piston rod 2 moves downward, the piston 4 moves toward the end of the second liquid hole 23 away from the first liquid hole 22. When the second liquid hole 23 moves downward to contact the blocking member 31 at the bottom of the columnar inner cavity 10, the second liquid hole 23 is blocked by the blocking member 31, and the oil passage between the second liquid chamber 12 and the liquid chamber 21 is cut off. The hydraulic oil in the second liquid chamber 12 cannot enter the liquid chamber 21 through the second liquid hole 23, and the second liquid chamber 12 cannot continue to be compressed, preventing the piston 4 and the piston rod 2 from continuing to move downward.

[0060] In this technical solution, the piston rod 2 is also connected to a shock-absorbing elastic member 5, which provides shock-absorbing elastic force for the piston rod. Figure 3 As shown, when the piston rod 2 moves downward, the piston 4 compresses the shock-absorbing elastic member 5, and the shock-absorbing elastic member 5 buffers and slows down the movement of the piston rod 2, absorbs the vibration on the piston rod 2, and achieves the purpose of further shock absorption. In addition, when the piston rod 2 moves upward, the shock-absorbing elastic member 5 is reset to assist and promote the upward movement of the piston rod 2.

[0061] In the present technical solution, the shock-absorbing elastic member 5 includes a shock-absorbing spring, which is sleeved on the piston rod 2 and located in the second liquid chamber 12. The shock-absorbing spring is sleeved on the piston rod and placed in the second liquid chamber 12, so as to reduce or shrink the outer diameter of the shock absorber. At the same time, the shock-absorbing spring is immersed in the hydraulic oil to prevent oxidation and rust of the shock-absorbing spring, thereby extending the service life of the shock-absorbing spring.

[0062] At this time, since the allowable compression stroke of the shock-absorbing elastic member 5 itself will limit the downward stroke of the piston rod 2 and the piston 4, the function of the blocking member 31 located in the second liquid chamber 12 will be to protect the shock-absorbing elastic member 5 and prevent the shock-absorbing elastic member 5 from being over-compressed and causing collision and abnormal noise.

[0063] In this technical solution, one end of the damping spring is directly or indirectly connected to the piston 4, and the other end is fixed to the end of the second liquid chamber 12 away from the first liquid chamber 11, so that the damping spring and the piston 4 move synchronously.

[0064] In the present technical solution, in one embodiment, the elastic member is a columnar spring. An abutting portion is fixedly provided on the piston rod 2, and the end of the columnar spring connected to the piston 4 abuts on the low connection portion, so that the columnar spring and the piston 4 are indirectly fixedly connected. The abutting portion is a fixed seat 6 sleeved on the piston rod, and the fixed seat 6 is placed in the second liquid chamber 12 and abuts against the piston. One end of the columnar spring close to the piston 4 is fixedly sleeved on the fixed seat 6. The provision of the fixed seat 6 facilitates the installation of the columnar spring, and avoids the columnar spring directly contacting the piston 4, causing friction to the piston 4, affecting the performance of the piston 4, and causing the piston 4 to fail. In addition, the connection between the columnar spring and the fixed seat 6 also avoids the problem of the columnar spring blocking the overflow hole 41 on the piston 4, 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.

[0065] In addition, the fixing seat 6 is provided to fix the columnar spring relative to the piston rod 2 in the radial direction, thereby avoiding friction between the columnar spring and the outer wall of the piston rod 2, which would affect the service life and performance of the columnar spring or the piston rod 2.

[0066] In the present technical solution, a plurality of first liquid holes 22 and second liquid holes 23 are respectively provided, and are evenly arranged along the circumference of the piston rod 2. The first liquid holes 22 and the second liquid holes 23 are evenly arranged along the circumference of the piston rod 2, so that when the hydraulic oil is transferred, multiple holes of the first liquid holes 22 and the second liquid holes 23 are involved in the work, which facilitates the uniform passage of the hydraulic oil, improves the passing efficiency of the hydraulic oil, and ensures the shock absorption performance of the shock absorber.

[0067] In the technical solution, the shock absorber further comprises a damping adjustment rod 7. The damping adjustment rod 7 adjusts the flow rate of the hydraulic oil during the transfer process to adjust the vibration absorption capacity of the piston rod 2.

[0068] The damping adjustment rod 7 is disposed inside 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 21 close to the first liquid chamber 11 and is connected to the damping adjustment mechanism, and the outer peripheral surface of the second end contacts the first liquid passage hole 22 or the second liquid passage hole 23.

[0069] The damping adjustment mechanism changes the position of the second end along the axial direction of the piston rod 2 , thereby changing the effective liquid passing area of ​​the first liquid passing hole 22 or the second liquid passing hole 23 .

[0070] The damping adjustment mechanism is used to adjust the position of the second end of the damping adjustment rod 7 in the liquid passage chamber 21 of the piston rod 2, so that the damping adjustment rod 7 blocks the first liquid passage hole 22 or the second liquid passage hole 23 by different amounts, thereby changing the effective liquid passage area of ​​the first liquid passage hole 22 or the second liquid passage hole 23, that is, changing the speed of the hydraulic oil flow, that is, changing the damping of the piston rod 2. By adjusting the damping of the piston rod 2, the shock absorbing capacity and instantaneous shock absorbing amplitude of the shock absorber are changed, so that the unicycle using the shock absorber can adapt to different driving environments.

[0071] In the technical solution, the damping adjustment mechanism includes a threaded seat 72 fixed relatively to the working fluid cylinder 1, a first end passes through the threaded seat 72 and is threadedly connected to the threaded seat 72, and the first end is threadedly connected to an adjustment handle 73. When adjusting, the adjustment handle 73 is rotated, the damping adjustment rod 7 moves relative to the threaded seat 72, and the second end moves axially along the piston rod 2, so as to adjust the blocking amount of the first liquid hole 22 or the second liquid hole 23, and adjust the damping of the piston rod 2, and the adjustment operation is simple and convenient.

[0072] In the present technical solution, the second end divides the liquid passage cavity into a first cavity and a second cavity. The first cavity is connected to the first liquid cavity 11 through the first liquid passage hole 22, and the second cavity is connected to the second liquid cavity 12 through the second liquid passage hole 23. The second end is provided with a first one-way valve 71, which conducts the oil passage from the second cavity to the first cavity. Figure 3 and Figure 4As 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 21 through the second liquid hole 23, specifically enters the space between the second end of the damping adjusting rod 7 and the bottom end of the liquid chamber 21, that is, enters the second chamber. At this time, the hydraulic pressure in this second chamber increases, and the hydraulic pressure will actively squeeze the first one-way valve 71, so that the first one-way valve 71 opens, and the hydraulic oil circuit from the second chamber to the first chamber is opened, and the hydraulic oil is transferred from the second chamber to the first chamber, that is, the oil channel from the second liquid chamber 12 to the first liquid chamber 11 is connected, and the oil in the second liquid chamber 12 enters the first liquid chamber 11.

[0073] like Figure 4 As shown, the first one-way valve 71 is an automatic opening and closing one-way valve, including a first liquid guide hole 711, a second liquid guide hole 712, a spring 713, and a blocking ball 714. When the hydraulic pressure in the second chamber increases, the blocking ball 714 is squeezed, and the blocking ball 714 squeezes the spring 713, so that the first liquid guide hole 711 and the second liquid guide hole 712 are connected, and the hydraulic oil can enter the first chamber from the second chamber to absorb the vibration or movement of the piston rod 2. On the contrary, when the hydraulic pressure in the first chamber increases, the hydraulic oil cannot push the blocking ball 714 in the opposite direction to squeeze the spring 713, and the first one-way valve is not connected at this time.

[0074] When the piston rod 2 rebounds upward, the first one-way valve 71 cannot be opened. At this time, the hydraulic oil in the first liquid chamber 11 needs to enter the second liquid chamber 12. To achieve this purpose, a second one-way valve is also provided in the shock absorber. The second one-way valve unidirectionally conducts the oil channel from the first liquid chamber 11 to the second liquid chamber 12.

[0075] The second one-way valve includes an overflow hole 41 provided on the piston 4 and a valve plate 42 for one-way blocking the overflow hole 41 . When the second one-way valve is turned on, the oil in the first liquid chamber 11 flows into the second liquid chamber 12 through the overflow hole 41 .

[0076] 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 42, the bottom end of the overflow hole 41 is opened, the overflow hole 41 is connected, and the hydraulic oil can be transferred. In the above solution, the second one-way valve has a simple structure and can realize oil return.

[0077] In the above scheme, the fixed seat 6 is located in the second liquid chamber 12, and an inclined avoidance surface 61 is provided on the side of the fixed seat 6 facing the piston 4. The inclined avoidance surface 61 avoids the valve plate 42 to ensure that the overflow hole 41 is smoothly opened and conducted. At the same time, the inclined avoidance surface 61 can also limit the valve plate 42 to avoid the problem that the valve plate 42 is over-opened and difficult to reset.

[0078] In the present technical solution, a wheelbarrow with the aforementioned shock absorber is also proposed. As a specific example, the wheelbarrow includes a hub motor, an upper body, a battery box, a foot pedal and the aforementioned shock absorber, the working fluid cylinder is fixedly connected to the hub motor, the upper body is connected to one end of the piston rod 2 (specifically, the upper end of the piston rod 2), the battery box is fixedly connected to the upper body, and the foot pedal can be connected to the battery box or the other end of the piston rod 2. The wheelbarrow adopts the aforementioned shock absorber, which has a good shock absorption effect, can adapt to driving on more bumpy roads, will not cause damage to the shock absorber, prolongs the service life of the shock absorber, and reduces the use cost of the wheelbarrow.

[0079] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned 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 present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A shock absorber, characterized in that: include: A working fluid cylinder, wherein the working fluid cylinder has a cylindrical inner cavity; A piston rod, wherein the piston rod is slidably disposed in the columnar inner cavity of the working fluid cylinder, and the two ends of the piston rod are respectively passed through the two ends of the working fluid cylinder, the two ends of the piston rod are sealed and the interior is hollow to form a liquid passage cavity; A piston, wherein the piston fixed sleeve is arranged outside the piston rod and divides the columnar inner cavity into a first liquid cavity and a second liquid cavity, and the piston rod located in the first liquid cavity and the second liquid cavity is respectively provided with a first liquid hole and a second liquid 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; An anti-collision mechanism, the anti-collision mechanism comprising a blocking member, the blocking member being fixedly arranged at least at one end of the cylindrical inner cavity and slidably arranged outside the piston rod; When the first liquid passage hole moves to the position of the blocking member, the blocking member blocks the first liquid passage hole, cutting off the oil passage between the first liquid chamber and the liquid passage chamber, and / or, when the second liquid passage hole moves to the position of the blocking member, the blocking member blocks the second liquid passage hole, cutting off the oil passage between the second liquid chamber and the liquid passage chamber.

2. The shock absorber according to claim 1, characterized in that: The sealing member includes a guide ring, which is fixedly installed at the end of the columnar inner cavity. The piston rod is slidably connected to the guide ring, and the end of the piston rod penetrates the first liquid cavity or the second liquid cavity through the guide ring, so that the end of the piston rod extends out of the columnar inner cavity.

3. The shock absorber according to claim 2, characterized in that: A blocking seat is fixed to at least one end of the columnar inner cavity, and the blocking member is fixedly installed on the blocking seat.

4. The shock absorber according to any one of claims 1 to 3, characterized in that: The blocking members are provided in two and are respectively fixed to the end of the first liquid chamber away from the second liquid chamber and the end of the second liquid chamber away from the first liquid chamber. When the piston rod moves to a preset position, the first liquid hole is blocked by the blocking member in the first liquid chamber, or the second liquid hole is blocked by the blocking member in the second liquid chamber.

5. The shock absorber according to claim 4, characterized in that: The piston rod is also connected with a shock-absorbing elastic member, and the shock-absorbing elastic member provides shock-absorbing elastic force for the piston rod.

6. The shock absorber according to claim 5, characterized in that: The shock-absorbing elastic member includes a shock-absorbing spring, which is sleeved on the piston rod and located in the second liquid chamber; One end of the shock absorbing spring is connected to the piston, and the other end is fixed to the end of the second liquid chamber away from the first liquid chamber.

7. The shock absorber according to any one of claims 1 to 3, characterized in that: A plurality of the first liquid passage holes and a plurality of the second liquid passage holes are respectively provided, and are evenly arranged along the circumference of the piston rod.

8. The shock absorber according to any one of claims 1 to 3, characterized in that: Also included is a damping adjustment lever; The damping adjustment rod is arranged inside the piston rod and includes a first end and a second end; the first end extends from the end of the liquid passage cavity close to the first liquid cavity and is connected to the damping adjustment mechanism, and the outer peripheral surface of the second end is in contact with 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 passing area of ​​the first liquid passing hole or the second liquid passing hole.

9. The shock absorber according to any one of claims 1 to 3, characterized in that: The second end divides the liquid passage cavity into a first cavity and a second cavity, the first cavity is connected to the first liquid cavity through the first liquid passage hole, and the second cavity is connected to the second liquid cavity through the second liquid passage hole; The second end is provided with a first one-way valve; the first one-way valve is a one-way oil passage connecting the second chamber to the first chamber; The shock absorber further comprises a second one-way valve, which unidirectionally conducts the oil passage from the first liquid chamber to the second liquid chamber; The second one-way valve comprises an overflow hole arranged on the piston and a valve plate for one-way blocking the overflow hole.

10. A wheelbarrow, characterized in that: The invention relates to a shock absorber as claimed in any one of claims 1 to 9.

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