Damper

Abstract

The damper comprises a piston rod, an oil storage pipe and a working cylinder arranged in the oil storage pipe, a sealing piston connected with the end of the working cylinder in a sealing mode is arranged in the oil storage pipe, the piston rod is movably arranged in the working cylinder, and one end of the piston rod penetrates out of the sealing piston. A limiting piece for limiting the stroke of the piston rod is arranged on the side, close to the working cylinder, of the sealing piston. A first cavity is formed between the piston rod and the working cylinder, a second cavity is formed between the working cylinder and the oil storage pipe, and a damping channel is arranged between the first cavity and the second cavity and penetrates through the sealing piston. The top valve has the advantage of solving the problem that a damping hole is difficult to process on the top valve in the conventional damper. According to the overhead valve, the sealing function and the stroke control function of an existing overhead valve are separated, a damping channel is formed in the sealing piston more simply, the machining difficulty is greatly reduced, the material selection flexibility is higher, and the replacement and maintenance cost can be reduced after one component is damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, in particular to a damper. Background Art

[0002] As described in Chinese Patent Publication No. CN221257503U, entitled "A Novel Photovoltaic Damper," a first hole is defined in the center of the top valve, connecting the space between the working cylinder and the oil reservoir tube to a first gap through the first hole. When the piston rod drives the piston upward, the damping medium enters the first space through the first gap and the first hole. As the damping medium flows through the first gap and the first hole, its flow rate slows, thereby achieving a damping force and a cushioning effect. When the piston rod reaches its maximum upward travel, the stop tube abuts the top valve, preventing further upward movement.

[0003] The top valve has both sealing and limiting functions. In order to ensure that it can cooperate with the limit tube to limit the stroke of the movable rod, the top valve needs to be made of a material with a certain rigidity. In addition, the top valve must have a sealing effect, and its wall thickness is relatively thick. The first hole needs to have a certain damping effect, and the aperture is relatively small. This makes it very difficult to process the first hole on the top valve, which increases the processing cost. Utility Model Content

[0004] The purpose of the utility model is to provide a damper which can effectively solve the problem that it is difficult to machine a damping hole on a top valve in the existing damper.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] A damper comprises a piston rod, an oil reservoir pipe, and a working cylinder disposed in the oil reservoir pipe, wherein a sealing piston is disposed in the oil reservoir pipe and is sealed to an end of the working cylinder, the piston rod is movably disposed in the working cylinder and one end thereof passes through the sealing piston, and a stopper is disposed on a side of the sealing piston close to the working cylinder for limiting the stroke of the piston rod;

[0007] A first chamber is formed between the piston rod and the working cylinder, a second chamber is formed between the working cylinder and the oil storage pipe, a damping channel is provided between the first chamber and the second chamber, and the damping channel passes through the sealing piston.

[0008] In the above damper, the sealing piston is provided with a sealing cavity which is sleeved on the end of the working cylinder, and the limiting member is arranged at the bottom of the sealing cavity.

[0009] In the above damper, the damping channel includes a first channel and a second channel that are connected. The first channel is provided on the limiting member and is connected to the first chamber. The second channel is located on the side wall of the sealing piston and is connected to the second chamber.

[0010] In the above damper, the limiting member is provided with a plurality of notches along its circumference, and at least one of the notches forms the first channel; or a gap is provided between the outer peripheral wall of the limiting member and the inner side wall of the sealing cavity to form the first channel.

[0011] In the above-mentioned damper, the second channel includes a groove opened on the side wall of the sealing piston and an oil outlet hole connecting the groove with the first channel, and the groove is connected to the second chamber; or, a gap is formed between the outer wall of the sealing piston and the inner wall of the oil storage pipe, and the gap is connected to the second chamber, and the second channel includes the gap and the oil outlet hole connecting the gap with the first channel.

[0012] In the above damper, the sealing piston includes a sealing portion sealedly connected to the inner wall of the working cylinder, and the limiting member is located in the working cylinder and abuts against the end surface of the sealing portion.

[0013] In the above damper, the damping channel includes a third channel provided on the sealing portion and a fourth channel provided on the limiting member, the third channel is connected to the second chamber, and the fourth channel is connected to the third channel and the first chamber.

[0014] In the above damper, the fourth channel is a through hole penetrating the limiting member; or a gap is provided between the limiting member and the piston rod to form the fourth channel.

[0015] In the above damper, a positioning step abutting against the end of the working cylinder is provided on the sealing portion, and the third channel passes through the positioning step and communicates with the second chamber.

[0016] In the above-mentioned damper, the third channel includes a first through section and a second through section that are connected, the first through section is arranged between the sealing part and the piston rod, the first through section is connected to the fourth channel, and the second through section penetrates the side wall of the sealing part and is connected to the second chamber.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] By providing a sealing piston and a limiter, and providing a damping channel passing through the sealing piston between the first chamber and the second chamber, the problem of difficulty in machining the damping hole on the top valve in the current damper is solved. The sealing piston is mainly used to seal the end of the working cylinder to separate the first chamber and the second chamber, while the limiter serves to limit the movement stroke of the piston rod. Therefore, the two functions of sealing and controlling the stroke of the top valve are separated. Since the sealing piston only needs to play a sealing role, the rigidity requirements for it are not high. It is relatively simple to open a damping channel on the sealing piston, which greatly reduces the processing difficulty. The two functions of sealing and limiting are realized by the sealing piston and the limiter respectively, which not only makes the material selection more flexible, but also reduces the replacement and maintenance costs when a component is damaged.

[0019] Furthermore, the sealing piston is provided with a sealing cavity that is sleeved on the end of the working cylinder, and the stopper is arranged at the bottom of the sealing cavity. A structure in which the sealing piston seals the end of the working cylinder is achieved by wrapping the end of the working cylinder through the sealing cavity, and the stopper is arranged at the bottom of the sealing cavity to facilitate the positioning of the stopper.

[0020] Furthermore, the damping channel includes a first channel and a second channel that are connected. The first channel is provided on the stopper and is connected to the first chamber, and the second channel is located on the side wall of the sealing piston and is connected to the second chamber. Providing the first channel on the stopper prevents the stopper from blocking the second channel, ensuring unobstructed flow of the second channel. Furthermore, the second channel is provided on the side wall of the sealing piston. When the stopper is squeezed, the impact on the second channel is reduced, ensuring that deformation of the second channel remains within a relatively small range.

[0021] Furthermore, the stopper is provided with a plurality of notches along its circumference, at least one of which forms the first channel; or a gap is provided between the outer peripheral wall of the stopper and the inner sidewall of the sealed cavity to form the first channel. Providing a plurality of notches on the stopper to form the first channel facilitates connecting the first channel with the second channel during installation, or providing a gap to form the first channel allows the first channel to be quickly connected to the corresponding second channel without additional adjustment of the position of the first channel.

[0022] Furthermore, the second channel includes a groove formed on the side wall of the sealing piston and an oil outlet hole connecting the groove with the first channel, the groove communicating with the second chamber; or, a gap is formed between the outer side wall of the sealing piston and the inner side wall of the oil storage tube, the gap communicating with the second chamber, and the second channel includes the gap and the oil outlet hole connecting the gap with the first channel. Producing an oil outlet hole is relatively simple, and the damping level can be controlled by adjusting the diameter of the oil outlet hole. The groove or gap formed on the seal or side wall facilitates the entry of the damping medium extruded through the oil outlet hole into the second chamber, and the processing method for forming the groove or gap is also relatively simple.

[0023] Furthermore, the sealing piston includes a sealing portion that is sealed to the inner wall of the working cylinder, and the limiting member is located in the working cylinder and abuts against the end face of the sealing portion. Another structure in which the sealing piston seals the end of the working cylinder is to form a seal with the inner wall of the working cylinder through the sealing avoidance, and the limiting member is located in the working cylinder and abuts against the end face of the sealing portion, and the limiting member can be limited by the inner wall of the working cylinder and the sealing portion.

[0024] Furthermore, the damping channel includes a third channel provided on the sealing portion and a fourth channel provided on the stopper, wherein the third channel is connected to the second chamber, and the fourth channel is connected to the third channel and the first chamber. Providing the fourth channel on the stopper prevents the stopper from obstructing the third channel, thereby ensuring unobstructed flow of the damping channel.

[0025] Furthermore, the fourth channel is a through hole penetrating the stopper; or, the fourth channel is formed by a gap between the stopper and the piston rod. Both structural forms of the fourth channel simplify and facilitate the processing of the stopper and ensure unimpeded communication between the third channel and the first chamber.

[0026] Furthermore, the sealing portion is provided with a positioning step that abuts against the end of the working cylinder, and the third passage extends from the positioning step to communicate with the second chamber. The positioning step can fix the relative position of the working cylinder and the sealing piston, ensuring that the sealing portion and the working cylinder are properly mated. The third passage extends from the positioning step to prevent the working cylinder from obstructing the third passage.

[0027] Furthermore, the third channel includes a first section and a second section that communicate with each other. The first section is disposed between the sealing portion and the piston rod and communicates with the fourth channel. The second section penetrates the sidewall of the sealing portion and communicates with the second chamber. Splitting the third channel into the first and second sections facilitates machining on the sealing piston. This structure also ensures that the damping medium can smoothly pass through the fourth and third channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a damper of the utility model when it is extended;

[0029] Figure 2 for Figure 1 Cross-sectional view of AA;

[0030] Figure 3 for Figure 2 B is a partial enlarged view of Example 1;

[0031] Figure 4 This is a three-dimensional diagram of the sealing piston in Example 1 of the present utility model;

[0032] Figure 5 This is a front view of the sealing piston in Example 1 of the present utility model;

[0033] Figure 6 for Figure 5 Cross-sectional view of CC;

[0034] Figure 7 This is a three-dimensional diagram of the limiting member in the first embodiment of the present utility model;

[0035] Figure 8 for Figure 2 B is a partial enlarged view of Example 2;

[0036] Figure 9 This is a front view of the assembly of the sealing piston and the limiting member in the second embodiment of the present invention;

[0037] Figure 10 for Figure 9 Cross-sectional view of the middle DD;

[0038] Figure 11 This is a cross-sectional view of a damper of the utility model when it is retracted.

[0039] The accompanying drawings are:

[0040] The piston rod 100, the oil storage pipe 200, the second chamber 210, the working cylinder 300, the first chamber 310, the sealing piston 400, the sealing chamber 410, the sealing portion 420, the positioning step 421, the limiting member 500, the notch 510, the damping channel 600, the first channel 610, the second channel 620, the groove 621, the oil outlet hole 622, the third channel 630, the first through section 631, the second through section 632, the fourth channel 640, and the limiting tube 700. DETAILED DESCRIPTION

[0041] A damper includes a piston rod 100, an oil storage pipe 200 and a working cylinder 300 arranged in the oil storage pipe 200, a sealing piston 400 sealedly connected to the end of the working cylinder 300 is provided in the oil storage pipe, the piston rod 100 is movably arranged in the working cylinder 300 and one end passes through the sealing piston 400, and a limiting member 500 is provided on the side of the sealing piston 400 close to the working cylinder 300 for limiting the stroke of the piston rod 100; a first chamber 310 is formed between the piston rod 100 and the working cylinder 300, a second chamber 210 is formed between the working cylinder 300 and the oil storage pipe 200, a damping channel 600 is provided between the first chamber 310 and the second chamber 210, and the damping channel 600 passes through the sealing piston 400.

[0042] By providing a sealing piston 400 and a stopper 500, and providing a damping passage 600 passing through the sealing piston 400 between the first chamber 310 and the second chamber 210, the difficulty of machining the damping hole in the top valve of the current damper is resolved. The sealing piston 400 primarily seals the end of the working cylinder 300, separating the first chamber 310 from the second chamber 210, while the stopper 500 limits the travel of the piston rod 100. This separates the current functions of sealing and controlling the travel of the top valve. Since the sealing piston 400 only needs to perform the sealing function, the rigidity requirements for it are not high. Providing the damping passage 600 in the sealing piston 400 is relatively simple, significantly reducing the manufacturing difficulty. By separating the sealing and limiting functions by the sealing piston 400 and the stopper 500, not only does it provide greater flexibility in material selection, but it also reduces replacement and maintenance costs if one component is damaged.

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0047] Example 1

[0048] See Figures 1 to 7 This is a first embodiment of a damper of the present invention, which includes a piston rod 100, an oil storage pipe 200 and a working cylinder 300. The working cylinder 300 is tubular, arranged in the oil storage pipe 200 and coaxial with the oil storage pipe 200. The working cylinder 300 and the oil storage pipe 200 are spaced apart to form a second chamber 210. A top valve is provided at the top of the working cylinder 300. In addition to closing the bottom end of the working cylinder 300, the top valve also has the function of keeping the top end of the working cylinder 300 coaxial with the oil storage pipe 200, and a damping hole is also opened on the top valve, so that the space in the working cylinder 300 between the piston and the top valve is connected to the space between the working cylinder 300 and the oil storage pipe 200. A piston is provided in the working cylinder 300, and the piston is sealedly connected to the inner wall of the working cylinder 300. A piston rod 100 is fixedly connected to the piston, and the bottom end of the piston rod 100 passes through the bottom end of the working cylinder 300. The diameter of the piston rod 100 is smaller than the inner diameter of the working cylinder 300, thereby forming a first chamber 310 between the piston rod 100 and the working cylinder 300.

[0049] A sealing piston 400 is provided at the bottom end of the working cylinder 300. The sealing piston 400 closes the bottom end of the working cylinder 300, thereby separating the first chamber 310 and the second chamber 210. A damping channel 600 is provided between the first chamber 310 and the second chamber 210. The damping channel 600 passes through the sealing piston 400. When the piston rod 100 drives the piston to slide in the working cylinder 300, the volume of the first chamber 310 will change. The damping medium in the first chamber 310 or the second chamber 210, such as air or oil, will flow into or out of the second chamber 210 through the damping channel 600, thereby obtaining a damping force and a buffering effect.

[0050] A stopper 500 is provided on the side of the sealing piston 400 near the working cylinder 300 to limit the travel of the piston rod 100. The stopper 500 primarily limits the distance the piston rod 100 can extend out of the working cylinder 300. A stopper can be provided on the piston rod 100 to cooperate with the stopper 500. The stopper will expand the diameter of the piston rod 100 at that location, so that after the piston rod 100 extends a certain distance out of the working cylinder 300, it will abut against the stopper 500, preventing the piston rod 100 from extending further outward. In addition to providing the stopper on the piston rod 100, a stopper tube 700 can also be provided on the piston rod 100. The end of the stopper tube 700 abuts against the stopper 500, preventing the piston rod 100 from extending further outward, thereby achieving the purpose of limiting the travel of the piston rod 100. In this embodiment, a stopper tube 700 is used to facilitate the processing of the piston rod 100. After being sleeved onto the piston rod 100, the stopper tube 700 can be fixedly connected to the piston rod 100 by bonding or welding. The main purpose of the stopper 500 is to have sufficient strength and rigidity to abut against the moving piston rod 100 and limit the movement of the piston rod 100. Therefore, there are no special requirements for the shape of the stopper 500, but its thickness can be made as thin as possible to reduce manufacturing costs.

[0051] Through the above structure, the sealing piston 400 that blocks the end of the working cylinder 300 and the limiter 500 for limiting the stroke of the piston rod 100 are divided into two parts, which are independent of each other. The sealing piston 400 and the limiter 500 can be made of different materials and structures to cope with different functions, so as to maximize their respective advantages. Since the sealing piston 400 mainly plays a sealing role and has low rigidity requirements, the processing difficulty of the damping channel 600 passing through the sealing piston 400 will be reduced compared with the existing solution. As long as the limiter 500 meets the limiting requirements, its structure will be simplified, and there will be more types of materials to choose from. It can be made thinner and lighter, and can be designed into different shapes as needed. During daily maintenance, the sealing piston 400 and the limiter 500 can also be replaced separately according to the wear and tear of the sealing piston 400 and the limiter 500, which reduces maintenance and servicing costs.

[0052] Furthermore, in this embodiment, the sealing piston 400 is sleeved on the bottom end of the working cylinder 300 to achieve sealing of the working cylinder 300. Specifically, a sealing cavity 410 is provided on the top surface of the sealing piston 400, and a seal is formed between the side wall of the sealing cavity 410 and the outer wall of the working cylinder 300. The seal can be formed by the material and structure of the sealing piston 400 itself, or by adding a sealing ring between the side wall of the sealing cavity 410 and the outer wall of the working cylinder 300. The limiting member 500 is provided at the bottom of the sealing cavity 410. When the sealing piston 400 is sleeved on the bottom end of the working cylinder 300, the bottom end of the working cylinder 300 is inserted into the sealing cavity 410, and the limiting member 500 will be clamped between the bottom end of the working cylinder 300 and the bottom of the sealing cavity 410, thereby also achieving the positioning of the limiting member 500.

[0053] The limiting member 500 can be composed of multiple monomers, and adjacent monomer structures can be arranged at intervals, so as to avoid the entrance and exit of the damping channel 600 opened on the sealing piston 400, or a gap can be formed between the limiting members 500 of adjacent monomer structures, so that the damping channel 600 on the sealing piston 400 is connected to the first chamber 310, that is, the damping channel 600 can achieve the connection between the first chamber 310 and the second chamber 210 as long as it passes through the sealing piston 400, without the need to open the damping channel 600 on the limiting member 500. Of course, the stopper 500 can also be a single piece. To facilitate manufacturing and installation, the stopper 500 in this embodiment is a single piece and is in the shape of a disc with a central opening. The central opening allows the piston rod 100 to pass through. The diameter of the stopper 500 is equal to the inner diameter of the placement cavity. In this way, when the working cylinder 300 is inserted into the sealing cavity 410, the periphery of the stopper 500 can abut against the end surface of the working cylinder 300, ensuring that the force on the stopper 500 is uniform. The following description will be based on the structure of the stopper 500 being a single piece. If the stopper 500 is a single piece with multiple spaced apart structures as described above, the structure of the second channel 620 on the sealing piston 400 described below can also be referred to.

[0054] The damping channel 600 includes a first channel 610 and a second channel 620. The first channel 610 is provided on the stopper 500 and communicates with the first chamber 310. The second channel 620 is provided on the sidewall of the sealing piston 400 and communicates with the second chamber 210. This forms a damping channel 600 that connects the first chamber 310 and the second chamber 210. When the damping medium enters the second chamber 210 from the first chamber 310 through the damping channel 600, or when the damping medium in the second chamber 210 enters the first chamber 310 through the damping channel 600, a damping force and a buffering effect are obtained. Although the first channel 610 is required to be provided on the stopper 500 in this solution, since the stopper 500 is currently only considered to produce a limiting effect, its thickness can be made relatively thin and its structure is relatively simple. Therefore, providing the first channel 610 on the stopper 500 will also be relatively simple.

[0055] Specifically, such as Figure 7 As shown, there are various structures for setting the first channel 610 on the limit member 500. Multiple notches 510 can be set along the circumference of the limit member 500, and at least one notch 510 forms a first channel 610 connected to the second channel 620. Such a setting can facilitate the installation of the limit member 500. The limit member 500 can quickly align and connect the first channel 610 and the second channel 620. Moreover, since the notch 510 is opened on the periphery of the limit member 500, and the position where the limit member 500 plays a limiting role is near the center hole, the notch 510 does not have much impact on the limiting of the limit member 500. In addition, the incision is located on the periphery of the limit member 500, close to the side wall of the sealing cavity 410, and the second channel 620 can also be opened on the side wall of the sealing cavity 410 to shorten the length of the second channel 620, which is more conducive to the processing of the second channel 620. In addition to the above-mentioned structure of opening a notch 510 around the limiting member 500, the diameter of the limiting member 500 can also be set to be slightly smaller than the inner diameter of the sealing cavity 410, so that there will be a gap between the limiting member 500 and the inner wall of the sealing cavity 410 to form a first channel 610, which can also meet the purpose of connecting the second channel 620 with the first chamber 310.

[0056] like Figures 4 to 6As shown, the second channel 620 includes a groove 621 formed on the outer wall of the sealing piston 400 and an oil outlet 622 connecting the groove 621 with the first channel 610. The groove 621 is connected to the second chamber 210. The oil outlet 622 is generally formed on the side wall of the sealing piston 400 corresponding to the sealing chamber 410, that is, the oil outlet 622 directly connects the sealing chamber 410 with the groove 621. This oil outlet 622 is the shortest and easiest to manufacture. In addition, the groove 621 formed on the outer wall of the sealing piston 400 does not significantly affect the sealing or support between the outer wall of the sealing piston 400 and the oil storage tube 200. In addition to forming the groove 621 on the outer wall of the sealing piston 400, the outer diameter of the sealing piston 400 can also be reduced to form a gap between the sealing piston 400 and the inner wall of the oil storage tube 200, thereby achieving communication between the oil outlet 622 and the second chamber 210.

[0057] When the piston rod 100 is subjected to external force, Figure 2 Switch to the stretched state Figure 11 When the piston rod 100 is in the retracted state, it pushes the piston upward, increasing the volume of the first chamber 310 and generating negative pressure within the first chamber 310. The damping medium in the second chamber 210 enters the first chamber 310 through the damping channel 600. Simultaneously, the damping medium in the working cylinder 300, located between the piston and the top valve, flows into the second chamber 210 through the damping orifice. As the damping medium passes through the damping channel 600 and the damping orifice, it generates a damping force and a buffering effect, slowing the movement of the piston rod 100. When the piston rod 100 moves from the retracted state to the extended state, the volume of the first chamber 310 decreases, forcing the damping medium in the first chamber 310 from the damping channel 600 into the second chamber 210. The damping medium in the second chamber 210 also enters the space between the piston and the top valve in the working cylinder 300 through the damping orifice, similarly slowing the movement of the piston rod 100. After the piston rod 100 extends outward a certain distance, the limiting portion or limiting tube 700 on the piston rod 100 abuts against the limiting member 500, thereby preventing the piston rod 100 from further outward movement and ensuring that the piston rod 100 moves within the designed range of travel. Since the piston rod 100 must pass through the bottom of the oil reservoir tube 200, the sealing piston 400 not only seals the bottom end of the working cylinder 300, but also seals the bottom end of the oil reservoir tube 200, preventing the damping medium in the second chamber 210 from leaking out of the bottom end of the oil reservoir tube 200. The sealing piston 400 and the piston rod 100 are also in a sealed connection. For the remaining damper structures in this embodiment, please refer to the description of Patent Publication No. CN221257503U or other related damper patents.

[0058] Example 2

[0059] The difference between this embodiment and the first embodiment is that the sealing method of the sealing piston 400 and the working cylinder 300 in this embodiment is different. In this embodiment, the sealing piston 400 is inserted into the working cylinder 300 to achieve the sealing of the bottom end of the working cylinder 300, instead of setting a sealing chamber 410 to seal the bottom end of the working cylinder 300 by wrapping it in the first embodiment.

[0060] like Figures 8 to 10 As shown, the sealing piston 400 includes a sealing portion 420 that is sealed to the inner wall of the working cylinder 300, and the limiting member 500 is located in the working cylinder 300 and abuts against the end face of the sealing portion 420, that is, the sealing portion 420 is inserted into the bottom end of the working cylinder 300 and is sealed to the inner wall of the working cylinder 300, thereby sealing the bottom end of the working cylinder 300, and the end face of the sealing portion 420 is used to limit the limiting member 500 in the axial direction, and the peripheral wall of the working cylinder 300 limits the limiting member 500 in the radial direction.

[0061] The structure of the stopper 500 can be consistent with that of the first embodiment. In this embodiment, the stopper 500 is also in the shape of a disc with a central opening. The stopper 500 is positioned between the first chamber 310 and the sealing piston 400. Therefore, the sealing channel includes a third channel 630 defined in the sealing portion 420 and a fourth channel 640 defined in the stopper 500. The third channel 630 communicates with the second chamber 210, and the fourth channel 640 communicates with the third channel 630 and the first chamber 310, thereby forming a complete damping channel 600.

[0062] The fourth channel 640 can be a through hole opened on the limit member 500, or a gap can be provided between the limit member 500 and the piston rod 100 to form the fourth channel 640. The opening of the through hole can not affect the limiting function of the middle hole of the limit member 500, and the aperture of the center hole of the limit member 500 is made slightly larger than the diameter of the piston rod 100. The formation of the gap can eliminate the need for additional processing steps. Therefore, in this embodiment, a solution of providing a gap between the limit member 500 and the piston rod 100 to form the fourth channel 640 will be adopted.

[0063] Furthermore, a positioning step 421 is provided on the sealing part 420, and the positioning step 421 abuts against the end of the working cylinder 300. The third channel 630 passes through the positioning step 421 and is connected to the second chamber 210. The inner wall of the positioning step 421 is flush with the inner wall of the sealing part 420. The outer peripheral wall of the positioning step 421 is slightly larger in diameter than the outer peripheral wall of the sealing part 420, thereby forming a step surface. When the sealing part 420 is inserted into the working cylinder 300, it abuts against the bottom end surface of the working cylinder 300. This arrangement enables the third channel 630 to have a shorter path and can avoid the obstruction of the working cylinder 300.

[0064] Furthermore, to more rationally arrange the path of the third channel 630, the third channel 630 includes a first through section 631 and a second through section 632. The first through section 631 is disposed between the sealing portion 420 and the piston rod 100. This can be achieved by making the central aperture of the sealing portion 420 slightly larger than the outer diameter of the piston rod 100, or by providing a groove in the central aperture of the sealing portion 420. The structure of the first through section 631 is preferably combined with the fourth channel 640 to provide a clearance fit between the stopper 500 and the piston rod 100. The second through section 632 penetrates the positioning step 421 to connect the first through section 631 with the second chamber 210. This effectively requires only machining the second through section 632 on the sealing piston 400. Furthermore, the second through section 632 only needs to pass through the wall thickness of the positioning step 421, making it relatively short in length, further reducing machining difficulty.

[0065] This embodiment can achieve the same technical effects as the first embodiment, but adopts a different structure. For other contents not described in this embodiment, please refer to the first embodiment.

[0066] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.

Claims

1. A damper comprising a piston rod, an oil storage pipe and a working cylinder arranged in the oil storage pipe, characterized in that: A sealing piston is provided in the oil storage pipe and is sealedly connected to the end of the working cylinder. The piston rod is movably arranged in the working cylinder and one end passes through the sealing piston. A limiter is provided on the side of the sealing piston close to the working cylinder for limiting the stroke of the piston rod. A first chamber is formed between the piston rod and the working cylinder, a second chamber is formed between the working cylinder and the oil storage pipe, a damping channel is provided between the first chamber and the second chamber, and the damping channel passes through the sealing piston.

2. A damper according to claim 1, characterized in that: The sealing piston is provided with a sealing cavity which is sleeved on the end of the working cylinder, and the limiting member is arranged at the bottom of the sealing cavity.

3. A damper according to claim 2, characterized in that: The damping channel includes a first channel and a second channel that are connected. The first channel is provided on the limiting member and is connected to the first chamber. The second channel is located on the side wall of the sealing piston and is connected to the second chamber.

4. A damper according to claim 3, characterized in that: The limiting member is provided with a plurality of notches along its circumference, and at least one of the notches forms the first channel; or a gap is provided between the outer peripheral wall of the limiting member and the inner side wall of the sealing cavity to form the first channel.

5. A damper according to claim 3, characterized in that: The second channel includes a groove formed on the side wall of the sealing piston and an oil outlet hole connecting the groove with the first channel, and the groove is connected to the second chamber; or, a gap is formed between the outer side wall of the sealing piston and the inner side wall of the oil storage pipe, and the gap is connected to the second chamber, and the second channel includes the gap and the oil outlet hole connecting the gap with the first channel.

6. A damper according to claim 1, characterized in that: The sealing piston includes a sealing portion sealedly connected to the inner wall of the working cylinder, and the limiting member is located in the working cylinder and abuts against the end surface of the sealing portion.

7. A damper according to claim 6, characterized in that: The damping channel includes a third channel provided on the sealing portion and a fourth channel provided on the limiting member. The third channel is communicated with the second chamber, and the fourth channel is communicated with the third channel and the first chamber.

8. A damper according to claim 7, characterized in that: The fourth channel is a through hole penetrating the limiting member; or, a gap is provided between the limiting member and the piston rod to form the fourth channel.

9. A damper according to claim 7, characterized in that: The sealing portion is provided with a positioning step that abuts against the end of the working cylinder, and the third channel passes through the positioning step and communicates with the second chamber.

10. A damper according to claim 9, characterized in that: The third channel includes a first through section and a second through section that are connected. The first through section is provided between the sealing portion and the piston rod. The first through section is connected to the fourth channel. The second through section penetrates the side wall of the sealing portion and is connected to the second chamber.

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