Double-cavity controllable damper

Abstract

The utility model relates to the technical field of dampers, and discloses a double-cavity controllable damper which comprises a cylinder barrel, a hydraulic piston, a piston rod, a floating piston, a tail plug and a guide sealing mechanism, the cylinder barrel comprises an air cavity and an oil cavity, and the floating piston is slidably connected into the cylinder barrel and used for isolating the air cavity from the oil cavity; the tail plug is connected to the end, close to the air cavity, of the cylinder barrel in a sealed mode, the guide sealing mechanism is connected to the end, away from the tail plug, of the cylinder barrel in a sealed mode, the hydraulic piston is slidably connected into the oil cavity and movably connected to one end of the piston rod, and flow holes used for communicating the oil cavities in the two sides of the hydraulic piston are formed in the hydraulic piston. The end, away from the hydraulic piston, of the piston rod is arranged in the guide sealing mechanism in a penetrating mode and extends out of the cylinder barrel. The size of the flow hole is controlled through the valve element, and the damping force is adjusted.

Description

Technical Field

[0001] The present application relates to the technical field of dampers, and in particular to a dual-chamber controllable damper. Background Art

[0002] A damper is a device that provides resistance to movement and dissipates the energy of movement. It is widely used in aerospace, aviation, military, guns, automobiles and other industries. Dampers can generally be divided into: spring dampers, hydraulic dampers, pulse dampers, rotary dampers, wind dampers, viscous dampers, etc.

[0003] The various frictions and other obstacles that attenuate free vibrations are called damping.

[0004] The damping force of the existing damper is set before production and is not easy to change. When the damping force is not clear or different damping forces are required for different working conditions, dampers with different damping forces need to be selected. Utility Model Content

[0005] In order to improve the problem that the damping force of the damper is inconvenient to adjust, the present application provides a dual-chamber controllable damper.

[0006] The present application provides a dual-chamber controllable damper, which adopts the following technical solution:

[0007] A dual-chamber controllable damper comprises a cylinder, a hydraulic piston, a piston rod, a floating piston, a tail plug and a guide sealing mechanism, wherein the cylinder comprises an air chamber and an oil chamber, the floating piston is slidably connected in the cylinder and is used to isolate the air chamber and the oil chamber; the tail plug is seal-connected to one end of the cylinder close to the air chamber, the guide sealing mechanism is seal-connected to one end of the cylinder away from the tail plug, the hydraulic piston is slidably connected in the oil chamber, the hydraulic piston is movably connected to one end of the piston rod, a flow hole for connecting the oil chambers on both sides of the hydraulic piston is provided in the hydraulic piston, a valve core is provided at the end of the piston rod for controlling the size of the flow hole, and the end of the piston rod away from the hydraulic piston is penetrated in the guide sealing mechanism and extends to the outside of the cylinder.

[0008] By adopting the above technical solution, the tail plug and the guide sealing mechanism are respectively sealed at both ends of the cylinder, and a cavity with two sealed ends is formed in the cylinder; the guide sealing mechanism is used to limit the axial movement of the piston rod along the cylinder, so that the movement of the piston rod is stable, and is sealed and connected with the piston rod to prevent leakage; the floating piston is set between the air cavity and the oil cavity, and is used to isolate the air cavity and the oil cavity, so that the hydraulic piston only moves in the oil cavity, solving the problem of the hydraulic piston's idle stroke without damping. The flow hole is used to connect the oil chambers on both sides of the hydraulic piston, and a valve core is set at the end of the piston rod. The size of the flow hole is changed by the valve core to adjust the size of the damping force.

[0009] Optionally, the hydraulic piston includes a valve seat, a first valve plate and a second valve plate are provided at one end of the valve seat, a placement groove is formed between the first valve plate and the second valve plate, a floating sealing ring is provided in the placement groove, the floating sealing ring is respectively pressed against the inner wall of the cylinder and the side wall of the first valve plate, or the floating sealing ring is respectively pressed against the inner wall of the cylinder and the side wall of the second valve plate; a first damping hole connected to the placement groove is provided on the first valve plate, and a plurality of second damping holes connected to the placement groove are provided on the second valve plate; a through hole is provided in the valve seat, the flow hole is provided on the side of the second valve plate on the valve seat away from the first valve plate, and is connected to the through hole, and the valve core is threadedly connected to the through hole for changing the size of the flow hole blocked.

[0010] By adopting the above technical solution, when the piston rod is extended or extended, the floating sealing ring is tightly pressed against the side wall of the first valve plate and the inner wall of the cylinder, or against the side wall of the second valve plate and the inner wall of the cylinder. When the flow hole is blocked, the flow of hydraulic oil in the oil chambers on both sides of the hydraulic piston is controlled by the first damping hole or the second damping hole, and the piston rod is subjected to a larger damping force at this time; when different damping forces are required according to the working conditions of the damper, the flow of hydraulic oil in the oil chambers on both sides of the hydraulic piston is controlled by the flow hole and the first damping hole, or the flow hole and the second damping hole at the same time. By rotating the piston rod and using the valve core to control the size of the flow hole, the flow hole increases, the damping force on the piston rod decreases, and the speed of the piston rod extending or extending increases; conversely, the flow hole decreases, the damping force on the piston rod increases, and the speed of the piston rod extending or extending slows down.

[0011] Optionally, the aperture of the first damping hole is smaller than the aperture of the second damping hole.

[0012] By adopting the above technical solution, the aperture of the first damping hole is smaller than the aperture of the second damping hole, and the damping force applied to the piston rod when extending and retracting is different, so that the speed at which the piston rod extends and retracts is different.

[0013] Optionally, a baffle plate for limiting the stroke of the valve core is fixedly connected to one end of the valve seat away from the air cavity, and the baffle plate sealing sleeve is arranged at one end of the valve core away from the tail plug.

[0014] By adopting the above technical solution, the baffle is used to limit the stroke of the valve core and prevent the valve core from falling off from the through hole of the hydraulic piston.

[0015] Optionally, the guide sealing mechanism includes a guide sleeve, a sealing sleeve and a spacer sleeve, the guide sleeve is sealingly connected to the end of the cylinder away from the tail plug, the guide sleeve is provided with a step hole, the step hole is provided with a bushing tube, the sealing sleeve is placed in the step hole and abuts against the bushing tube, the spacer sleeve abuts against the side of the guide sleeve close to the sealing sleeve, and the side of the spacer away from the spacer sleeve abuts against the limiting portion provided at the end of the cylinder; the piston rod passes through the spacer sleeve, the sealing sleeve and the bushing tube in sequence, the sealing sleeve is tightly pressed against the step hole, and the surface of the piston rod is tightly pressed.

[0016] By adopting the above technical solution, when the piston rod slides axially along the cylinder, it is guided by the guide sleeve and the spacer sleeve, and the telescopic rod is sealed by the sealing sleeve to prevent the filler from leaking to the outside. The setting of the spacer sleeve limits the maximum stroke of the piston rod when it is extended.

[0017] Optionally, the floating piston comprises a valve body, and the valve body is provided with at least one sealing member pressed against the inner wall of the cylinder.

[0018] By adopting the above technical solution, the sealing between the floating piston and the cylinder body is ensured, and leakage between the air cavity and the oil cavity is prevented; by providing multiple sealing elements, the stability of the floating piston can also be ensured.

[0019] Optionally, a plurality of flow holes are provided, and the flow holes are distributed along the radial direction of the hydraulic piston, or distributed along the circumferential direction of the hydraulic piston.

[0020] By adopting the above technical solution, a plurality of flow holes are provided, the adjustment range of the damping force is increased, so that the damper is applicable to a wider range of use and is easy to adjust.

[0021] Optionally, a first connecting member is provided at one end of the piston rod outside the cylinder, and a second connecting member is provided at one end of the tail plug extending outside the cylinder.

[0022] By adopting the above technical solution, the first connecting member and the second connecting member play a role of fixed connection, which is convenient for testing or installing the damper; the second damper also plays a role of fixing the tail plug, so that the tail plug is fixed to the end of the cylinder.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: by controlling the size of the flow hole through the valve core, the damping force of the damper can be adjusted; by setting different apertures and numbers of the first damping hole and the second damping hole, the speed of the piston rod extending in and out can be controlled; by isolating the air chamber and the oil chamber through the floating piston, the hydraulic piston only moves in the oil chamber, thereby solving the problem of undamped idle stroke of the single-chamber damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the double-chamber controllable damper of Example 1 of the present application.

[0025] Figure 2 It is a structural schematic diagram of the guide sealing mechanism of Example 1 of the present application.

[0026] Figure 3 It is a schematic diagram of the structure of the floating piston in Example 1 of the present application.

[0027] Figure 4 It is a structural schematic diagram of the connection between the hydraulic piston and the piston rod in Example 1 of the present application.

[0028] Figure 5 It is a structural schematic diagram of a state of the flow hole after the piston rod rotates in Example 1 of the present application.

[0029] Figure 6 It is a schematic diagram of the structure when the piston rod of Example 1 of the present application is extended.

[0030] Figure 7 It is a schematic diagram of the radial distribution structure of Example 2 of the present application.

[0031] Figure 8 It is a schematic structural diagram of the circumferential distribution of flow holes in Example 2 of the present application.

[0032] Fig. 9 It is a schematic diagram of the structure of the dustproof telescopic sleeve of Example 3 of the present application.

[0033] Reference numerals: 1, cylinder barrel; 11, air chamber; 12, oil chamber; 121, first chamber; 122, second chamber; 13, first folding portion; 14, second folding portion; 15, limit portion; 2, hydraulic piston; 21, valve seat; 211, flow hole; 212, through hole; 22, first valve plate; 221, first damping hole; 23, second valve plate; 231, second damping hole; 24, placement groove; 25, floating seal ring; 26, baffle; 3 , piston rod; 31, valve core; 4, floating piston; 41, valve body; 42, sealing element; 5, tail plug; 51, fourth sealing ring; 6, guide sealing mechanism; 61, guide sleeve; 62, sealing sleeve; 63, spacer sleeve; 64, bushing tube; 65, first sealing ring; 66, second sealing ring; 67, third sealing ring; 68, step hole; 7, first connecting piece; 8, second connecting piece; 9, dustproof telescopic sleeve; 91, sleeve joint; 92, telescopic part. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings.

[0035] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0036] Embodiment 1:

[0037] The present application embodiment discloses a dual-chamber controllable damper, referring to Figure 1 , including a cylinder 1, a hydraulic piston 2, a piston rod 3, a floating piston 4, a tail plug 5 and a guide sealing mechanism 6. The cylinder 1 is a hollow tubular structure with two ends blocked. The two ends of the cylinder 1 are respectively provided with a first folding portion 13 and a second folding portion 14. The end of the cylinder 1 close to the second folding portion 14 is provided with a limit portion 15. The limit portion 15 is composed of an air chamber 11 and an oil chamber 12, which are formed by the cylinder 1. The air chamber 11 is filled with high-pressure nitrogen, and the oil chamber 12 is filled with hydraulic oil. The floating piston 4 is slidably connected in the cylinder 1 to isolate the air chamber 11 and the oil chamber 12. The hydraulic piston 2 is slidably connected in the oil chamber 12, and the hydraulic piston 2 divides the oil chamber 12 into a first cavity 121 and a second cavity 122. One end of the piston rod 3 is movably connected to the hydraulic piston 2. The end of the piston rod 3 away from the hydraulic piston 2 is sealed and penetrated in the guide sealing mechanism 6 and extends to the outside of the cylinder 1. The end of the piston rod 3 extending to the outside of the cylinder 1 is provided with a first connecting member 7.

[0038] Reference Figure 1 and Figure 2The guide sealing mechanism 6 is placed at one end of the cylinder 1 close to the oil chamber 12. The guide sealing mechanism 6 includes a guide sleeve 61, a sealing sleeve 62, a bushing tube 64 and a spacer sleeve 63. A step hole 68 is provided in the guide sleeve 61. The bushing tube 64 has a T-shaped cross section. The bushing tube 64 is placed in the step hole 68. The outer wall of the bushing tube 64 is tightly against the inner wall of the guide sleeve 61. The sealing sleeve 62 is placed in the step hole 68 and is tightly against the inner wall of the guide sleeve 61 and the end of the bushing tube 64. One end of the guide sleeve 61 is in contact with the inner wall of the first folded portion 13. The side of the sealing sleeve 62 away from the bushing tube 64 is flush with the side of the guide sleeve 61 away from the first folded portion 13. The outer wall of the guide sleeve 61 is provided with a first sealing ring 65 that is tightly against the inner wall of the cylinder 1. The spacer 63 is a cylindrical structure. The spacer 63 is axially provided with a through hole 212 for passing the piston rod 3. The spacer 63 is sealed and connected to the cylinder 1. One side of the spacer 63 is flush with the guide sleeve 61 and the sealing sleeve 62 and is pressed against the other side. The other side of the spacer 63 is in contact with the limiting portion 15. The guide sealing mechanism 6 is limited to the end of the cylinder 1 through the first folding portion 13 and the limiting portion 15. A second sealing ring 66 is arranged on the outer wall of the spacer 63 to contact the inner wall of the cylinder 1. The piston rod 3 is slidably passed through the spacer 63, the sealing sleeve 62 and the bushing tube 64 in sequence. The inner wall of the sealing sleeve 62 is pressed against the surface of the piston rod 3. A third sealing ring 67 is arranged in the spacer 63 to contact the surface of the piston rod 3 to ensure the sealing performance of the guide sealing mechanism 6 with the inner wall of the cylinder 1 and the piston rod 3.

[0039] The tail plug 5 is placed at one end of the cylinder 1 close to the air cavity 11 and is pressed against the second folded portion 14. A connecting portion is provided at the other end of the tail plug 5 and extends outside the cylinder 1. A second connecting member 8 is threadedly connected to the connecting portion, and the end of the second connecting member 8 close to the cylinder 1 is pressed against the outside of the first folded portion 13 to fix the tail plug 5 at the end of the cylinder 1. At least one fourth sealing ring 51 is provided between the end of the tail plug 5 located in the cylinder 1 and the inner wall of the cylinder 1. The fourth sealing ring 51 is pressed against the inner wall of the cylinder and the tail plug 5 respectively to ensure the sealing between the tail plug 5 and the cylinder 1 and prevent leakage of gas in the air cavity 11.

[0040] The first connecting member 7 and the second connecting member 8 can be sheet joints, steel joints, plastic joints, etc.

[0041] The surface of the cylinder 11 is spray-painted, and the surface of the piston rod 3 is QPQ (Quench-Polish-Quench) treated.

[0042] Reference Figure 1 and Figure 3The floating piston 4 includes a valve body 41, which is a cylindrical structure. At least one sealing member 42 is provided on the valve body 41. The sealing member 42 is respectively pressed against the inner wall of the cylinder 1 and the valve body 41 to ensure the sealing performance of the floating piston 4 and the inner wall of the cylinder 1, and at the same time increase the contact area between the floating piston 4 and the inner wall of the cylinder 1, thereby improving the stability of the floating piston 4 in the cylinder 1. When in use, in order to ensure the stability of the floating piston 4, a pressure of at least 20N is applied to the air chamber 11.

[0043] Reference Figure 4 , Figure 5 and Figure 6 The hydraulic piston 2 includes a valve seat 21, one end of which is fixedly connected to a first valve plate 22 and a second valve plate 23 arranged in parallel, a placement groove 24 is formed between the first valve plate 22 and the second valve plate 23, a floating seal ring 25 is arranged in the placement groove 24, and the floating seal ring 25 is an O-ring. A first damping hole 221 is provided on the first valve plate 22, and the first damping hole 221 is connected to the first oil chamber 12 and the placement groove 24. A plurality of second damping holes 231 are provided on the second valve plate 23 at equal intervals, and the second damping holes 231 are connected to the second oil chamber 12 and the placement groove 24, and the aperture of the first damping hole 221 is smaller than the aperture of the second damping hole 231. An axial through hole 212 and a radial flow hole 211 are provided in the valve seat 21, and the through hole 212 and the flow hole 211 form a channel, and the channel is connected to the oil chambers 12 on both sides of the hydraulic piston 2.

[0044] A valve core 31 is provided at the end of the piston rod 3 close to the hydraulic piston 2. The valve core 31 is threadedly connected to the through hole 212. The side of the valve core 31 blocks the flow hole 211, thereby changing the flow of hydraulic oil passing through the flow hole 211 and changing the damping force on the hydraulic piston 2. A baffle 26 is provided at one end of the through hole 212 away from the first valve plate 22 to limit the stroke of the valve core 31 and prevent the valve core 31 from falling off during rotation.

[0045] The implementation principle of a dual-chamber controllable damper in an embodiment of the present application is: when in use, the magnitude of the damping force is adjusted according to the working conditions. By rotating the piston rod 3, the valve core 31 at the end of the piston rod 3 moves in the valve seat 21, and the side of the valve core 31 blocks the size of the flow hole 211, thereby adjusting the magnitude of the damping force on the piston. When the piston rod 3 is rotated forward, the valve core 31 moves toward the direction close to the hydraulic piston 2, the flow hole 211 is gradually blocked, and the damping force on the piston rod 3 increases; when the piston rod 3 is reversed, the valve core 31 moves toward the direction away from the hydraulic piston 2, the flow hole 211 gradually increases, the amount of oil passing through the flow hole 211 increases, and the damping force on the piston rod 3 decreases.

[0046] After the damping force is determined, when the piston rod 3 is extended, the hydraulic piston 2 squeezes the second oil chamber 12, the floating sealing ring 25 presses against the first valve plate 22 and the inner wall of the cylinder 1 respectively, and the hydraulic oil flows from the second oil chamber 12 to the first oil chamber 12 through the first damping hole 221 and the flow hole 211; when the piston rod 3 is extended, the hydraulic piston 2 squeezes the first oil chamber 12, the floating sealing ring 25 presses against the second valve plate 23 and the inner wall of the cylinder 1 respectively, and the hydraulic oil flows from the first oil chamber 12 to the second oil chamber 12 through the second damping hole 231 and the flow hole 211. Since the aperture of the first damping hole 221 is smaller than the aperture of the second damping hole 231, and the number of the first damping holes 221 is less than the number of the second damping holes 231, the damping force received by the piston rod 3 when it is extended is greater than the damping force received when it is extended, so that the speed of the piston rod 3 when it is extended is slower than the speed when it is extended.

[0047] Embodiment 2:

[0048] The structure of this embodiment is basically the same as that of embodiment 1, except that the number of flow holes is different: Figure 7 and Figure 8 A plurality of flow holes 211 are provided, and the flow holes 211 are symmetrically distributed along the radial direction of the valve seat 21 , or uniformly distributed along the circumference of the valve seat 21 .

[0049] The implementation principle of a dual-chamber controllable damper in an embodiment of the present application is: multiple flow holes 211 are provided to increase the adjustment range of the damping force, so that the damper is applicable to a wider range of use and is easy to adjust.

[0050] Embodiment 3:

[0051] The structure of this embodiment is basically the same as that of embodiment 1 and embodiment 2, except that a dustproof telescopic sleeve 9 is provided at the end of the cylinder barrel 1: Fig. 9 The end of the cylinder 1 close to the guide sealing mechanism 6 is provided with a dustproof telescopic sleeve 9. The dustproof telescopic sleeve 9 is made of elastic rubber material. The dustproof telescopic sleeve 9 is a hollow integrated structure. The dustproof telescopic sleeve 9 includes a sleeve portion 91 and a telescopic portion 92. The sleeve portion 91 is sleeved on the outer side wall of the end of the cylinder 1 close to the guide sealing mechanism 6 and is adhered to the outer wall of the cylinder 1 by glue to prevent the sleeve portion 91 from falling off. The telescopic portion 92 is a continuously bent structure. The telescopic portion 92 is easy to telescope when subjected to external force. The end of the piston rod 3 located outside the cylinder 1 is inserted into the telescopic portion 92. The bent portion of the telescopic portion 92 close to the piston rod 3 is pressed against the surface of the piston rod 3 to prevent external dust from entering the cylinder 1.

[0052] The implementation principle of a dual-chamber controllable damper in an embodiment of the present application is: the sleeve portion 91 is adhered to the outer wall of the end of the cylinder 1 to prevent the sleeve portion 91 from falling off; the telescopic portion 92 is sealed and connected to the piston rod 3 to prevent dust from entering, and when the telescopic portion 92 is acted upon by an external force, the telescopic portion 92 expands and contracts in the direction of the force.

[0053] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A dual-chamber controllable damper, characterized in that: The invention comprises a cylinder (1), a hydraulic piston (2), a piston rod (3), a floating piston (4), a tail plug (5) and a guide sealing mechanism (6); the cylinder (1) comprises an air chamber (11) and an oil chamber (12); the floating piston (4) is slidably connected in the cylinder (1) to isolate the air chamber (11) from the oil chamber (12); the tail plug (5) is sealably connected to one end of the cylinder (1) close to the air chamber (11); the guide sealing mechanism (6) is sealably connected to the end of the cylinder (1) away from the tail plug (5). At one end, the hydraulic piston (2) is slidably connected to the oil chamber (12), the hydraulic piston (2) is movably connected to one end of the piston rod (3), the hydraulic piston (2) is provided with a flow hole (211) for connecting the oil chambers (12) on both sides of the hydraulic piston (2), the end of the piston rod (3) is provided with a valve core (31) for controlling the size of the flow hole (211), and the end of the piston rod (3) away from the hydraulic piston (2) is inserted into the guide sealing mechanism (6) and extends to the outside of the cylinder (1).

2. The dual-chamber controllable damper according to claim 1, characterized in that: The hydraulic piston (2) comprises a valve seat (21), one end of which is provided with a first valve plate (22) and a second valve plate (23), a placement groove (24) is formed between the first valve plate (22) and the second valve plate (23), a floating sealing ring (25) is provided in the placement groove (24), the floating sealing ring (25) is respectively pressed against the inner wall of the cylinder barrel (1) and the side wall of the first valve plate (22), or the floating sealing ring (25) is respectively pressed against the inner wall of the cylinder barrel (1) and the side wall of the second valve plate (23); the first valve plate (22) A first damping hole (221) connected to the placement groove (24) is provided on the valve seat (21), and a plurality of second damping holes (231) connected to the placement groove (24) are provided on the second valve plate (23); a through hole (212) is provided in the valve seat (21), and the flow hole (211) is provided on the side of the second valve plate (23) on the valve seat (21) away from the first valve plate (22) and is connected to the through hole (212); the valve core (31) is threadedly connected to the through hole (212) and is used to change the size of the flow hole (211) for blocking.

3. The dual-chamber controllable damper according to claim 2, characterized in that: The aperture of the first damping hole (221) is smaller than the aperture of the second damping hole (231).

4. The dual-chamber controllable damper according to claim 2, characterized in that: The end of the valve seat (21) away from the air cavity (11) is fixedly connected to a baffle (26) for limiting the valve core (31), and the baffle (26) sealing sleeve is arranged on the end of the valve core (31) away from the tail plug (5).

5. The dual-chamber controllable damper according to claim 1, characterized in that: The floating piston (4) comprises a valve body (41), and the valve body (41) is provided with at least one sealing member (42) pressed tightly against the inner wall of the cylinder barrel (1).

6. The dual-chamber controllable damper according to claim 1, characterized in that: The guide sealing mechanism (6) comprises a guide sleeve (61), a sealing sleeve (62) and a spacer sleeve (63). The guide sleeve (61) is sealedly connected to the end of the cylinder (1) away from the tail plug (5). A step hole (68) is provided in the guide sleeve (61). A bushing tube (64) is provided in the step hole (68). The sealing sleeve (62) is placed in the step hole (68) and abuts against the bushing tube (64). The spacer sleeve (63) abuts against a side of the guide sleeve (61) close to the sealing sleeve (62). A side of the spacer sleeve (63) away from the spacer sleeve (63) abuts against a limiting portion (15) provided at the end of the cylinder (1). The piston rod (3) passes through the spacer sleeve (63), the sealing sleeve (62) and the bushing tube (64) in sequence. The sealing sleeve (62) abuts against the step hole (68) and the surface of the piston rod (3) abuts against it.

7. The dual-chamber controllable damper according to claim 1, characterized in that: A plurality of flow holes (211) are provided, and the flow holes (211) are distributed radially along the hydraulic piston (2), or distributed circumferentially along the hydraulic piston (2).

8. The dual-chamber controllable damper according to claim 1, characterized in that: A first connecting member (7) is provided at one end of the piston rod (3) located outside the cylinder barrel (1), and a second connecting member (8) is provided at one end of the tail plug (5) extending outside the cylinder barrel (1).

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