Damping cylinder

Abstract

The present disclosure provides a damping oil cylinder, belonging to the field of hydraulic elements. The damping oil cylinder comprises a cylinder body, a piston and a pilot assembly. The cylinder body has a first oil inlet, a bypass oil passage and a drain passage, the first end of the first oil inlet and the first end of the drain passage both penetrate the outer surface of the cylinder body, and the first end of the bypass oil passage is connected with the first oil inlet; a part of the piston is movably inserted into the cylinder body to form a first cavity and a pilot cavity between the piston and the cylinder body, the first cavity is connected with the second end of the first oil inlet, and the pilot cavity is connected with the second end of the bypass oil passage and the second end of the drain passage; the pilot assembly comprises a pilot valve core and an elastic member, the pilot valve core is movably located in the pilot cavity, and the moving direction of the pilot valve core is consistent with the moving direction of the piston, and the elastic member is clamped between the pilot valve core and the piston. The present disclosure can realize reliable damping for the thrust bearing.

Description

Technical Field

[0001] This disclosure pertains to the field of hydraulic components, and particularly relates to a vibration damping cylinder. Background Technology

[0002] A thrust bearing is a type of bearing capable of withstanding axial loads. The thrust plate is an important component of a thrust bearing, primarily used to bear the load.

[0003] In related technologies, in order to eliminate the vibration caused by load impact, a spring or rubber pad is usually placed behind the thrust plate.

[0004] However, with prolonged use, both the springs and rubber pads will age and fail. Summary of the Invention

[0005] This disclosure provides a vibration-damping cylinder capable of reliably reducing vibrations in thrust bearings. The technical solution is as follows:

[0006] This disclosure provides a vibration damping cylinder, including:

[0007] The cylinder block has a first oil inlet passage, a bypass oil passage, and an oil drain passage. The first end of the first oil inlet passage and the first end of the oil drain passage both penetrate the outer surface of the cylinder block. The first end of the bypass oil passage is connected to the first oil inlet passage.

[0008] A piston is partially movably inserted into the cylinder to form a first cavity and a pilot cavity between the piston and the cylinder. The first cavity is connected to the second end of the first oil inlet passage, and the pilot cavity is connected to the second end of the bypass oil passage and the second end of the drain passage.

[0009] A pilot assembly includes a pilot valve core and an elastic element. The pilot valve core is movably located within the pilot cavity, and the direction of movement of the pilot valve core is consistent with the direction of movement of the piston. The elastic element is sandwiched between the pilot valve core and the piston. The pilot assembly is configured such that, under the oil pressure of the bypass oil passage, the pilot valve core moves toward the piston and compresses the elastic element to open the second end of the drain passage.

[0010] In one implementation of this disclosure, the piston has a guide post on the side facing the cylinder.

[0011] The axial direction of the guide post is consistent with the moving direction of the piston, and one end of the guide post is movably located in the pilot cavity.

[0012] In one implementation of this disclosure, the pilot valve core has a guide groove on the side facing the elastic member;

[0013] The length direction of the guide groove is consistent with the moving direction of the pilot valve core;

[0014] One end of the guide post is movably inserted into the guide groove.

[0015] In one implementation of this disclosure, the elastic element is a disc spring, and the elastic element is sleeved on the guide post.

[0016] In one implementation of this disclosure, the pilot valve core has a pointed tip on the side facing away from the elastic element;

[0017] When the pointed tip is inserted into the second end of the bypass oil passage, the pilot valve core closes the second end of the drain passage.

[0018] In one implementation of this disclosure, the cylinder body has a groove on the side facing the piston;

[0019] The piston has a boss on the side facing the cylinder body. The boss protrudes along the direction of piston movement and is movably inserted into the groove to form the first cavity.

[0020] In one implementation of this disclosure, the cylinder block has a second oil inlet passage, the first end of which penetrates the outer surface of the cylinder block;

[0021] A second cavity is provided between the piston and the cylinder, and the second cavity is connected to the second end of the second oil inlet passage.

[0022] In one implementation of this disclosure, the second cavity is arranged around the perimeter of the first cavity.

[0023] In one implementation of this disclosure, the cylinder body has an annular groove on the side facing the piston;

[0024] The piston has a protruding ring on the side facing the cylinder body. The protruding ring protrudes along the direction of piston movement and is movably inserted into the ring groove to form the second cavity.

[0025] In one implementation of this disclosure, the cylinder body includes a body and an end cap;

[0026] The end cap is detachably and sealingly connected to the cylinder body to form the pilot cavity between the cylinder body and the piston.

[0027] The beneficial effects of the technical solutions provided in this disclosure are:

[0028] The vibration damping cylinder provided in this embodiment dampens the thrust bearing by connecting the portion of the piston outside the cylinder to the thrust plate of the thrust bearing, such that the force direction of the thrust plate is consistent with the movement direction of the piston. In this way, the movement of the piston absorbs and bears a portion of the force on the thrust plate, thereby achieving a vibration damping effect.

[0029] When the damping cylinder is working, hydraulic oil is introduced into the first end of the first inlet passage. The hydraulic oil enters the first chamber through the first inlet passage, causing the piston to always tend to move towards the thrust plate, thus supporting the thrust plate. Simultaneously, a portion of the hydraulic oil in the first inlet passage enters the bypass passage, driving the pilot valve core to move towards the piston and compressing the elastic element. This opens the second end of the drain passage, allowing further hydraulic oil to drain and preventing excessive oil pressure in the first chamber. If the load on the thrust plate increases, the thrust plate will push the piston towards the cylinder body, compressing the elastic element and increasing its compression. This increases the elastic force exerted by the elastic element on the pilot valve core, causing the pilot valve core to move away from the piston, reducing the opening of the second end of the drain passage. Because the opening of the second end of the drain passage decreases, the amount of oil drained also decreases, thereby increasing the oil pressure in the first chamber and increasing the piston's load-bearing capacity on the thrust plate. If the load on the thrust plate decreases, the piston will move toward the thrust plate to reset, the compression of the elastic element will decrease, and the pilot valve core will move toward the piston to increase the opening of the second end of the drain passage, thereby reducing the oil pressure in the first chamber and reducing the piston's load on the thrust plate.

[0030] In other words, the vibration damping cylinder provided in this embodiment can provide corresponding load-bearing capacity to the thrust plate according to the magnitude of the load, thereby achieving the effect of vibration damping. Furthermore, the vibration damping cylinder has a fast response, stable dynamic adjustment, long service life, and high reliability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the vibration damping cylinder provided in the embodiments of this disclosure.

[0033] The symbols in the diagram represent the following meanings:

[0034] 10. Cylinder block;

[0035] 110. First oil inlet passage; 120. Bypass oil passage; 130. Drain passage; 140. Groove; 150. Second oil inlet passage; 160. Annular groove; 170. Main body; 180. End cap;

[0036] 20. Piston;

[0037] 210. Guide post; 220. Boss; 230. Plug ring;

[0038] 30. First cavity;

[0039] 40. Pilot cavity;

[0040] 50. Pilot component;

[0041] 510. Pilot valve core; 520. Elastic element; 530. Guide groove; 540. Point;

[0042] 60. Second cavity. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0044] A thrust bearing is a type of bearing capable of withstanding axial loads. The thrust plate is an important component of a thrust bearing, primarily used to bear the load.

[0045] In related technologies, in order to eliminate the vibration caused by load impact, a spring or rubber pad is usually placed behind the thrust plate.

[0046] However, with prolonged use, both the springs and rubber pads will age and fail.

[0047] To address the aforementioned technical problems, this disclosure provides a vibration-damping hydraulic cylinder. Figure 1 See the schematic diagram of the vibration damping cylinder. Figure 1In this embodiment, the damping cylinder includes a cylinder body 10, a piston 20, and a pilot assembly 50. The cylinder body 10 has a first oil inlet passage 110, a bypass oil passage 120, and an oil drain passage 130. The first end of the first oil inlet passage 110 and the first end of the oil drain passage 130 both penetrate the outer surface of the cylinder body 10. The first end of the bypass oil passage 120 is connected to the first oil inlet passage 110. A portion of the piston 20 is movably inserted into the cylinder body 10 to form a first cavity 30 and a pilot cavity 40 between the piston 20 and the cylinder body 10. The first cavity 30 is connected to the second end of the first oil inlet passage 110, and the pilot cavity 40 is connected to the second ends of the bypass oil passage 120 and the second ends of the oil drain passage 130. The pilot assembly 50 includes a pilot valve core 510 and an elastic element 520. The pilot valve core 510 is movably located within the pilot cavity 40, and the direction of movement of the pilot valve core 510 is consistent with the direction of movement of the piston 20. The elastic element 520 is sandwiched between the pilot valve core 510 and the piston 20. The pilot assembly 50 is configured such that the pilot valve core 510 moves toward the piston 20 and compresses the elastic element 520 under the oil pressure of the bypass oil passage 120, thereby opening the second end of the drain passage 130.

[0048] The vibration damping cylinder provided in this embodiment dampens the thrust bearing by connecting the portion of the piston 20 outside the cylinder body 10 to the thrust plate of the thrust bearing, such that the force direction of the thrust plate is consistent with the movement direction of the piston 20. In this way, the movement of the piston 20 can absorb and bear a portion of the force on the thrust plate, thereby achieving a vibration damping effect.

[0049] When the damping cylinder is working, hydraulic oil is introduced into the first end of the first inlet passage 110. The hydraulic oil enters the first chamber 30 through the first inlet passage 110, causing the piston 20 to always tend to move towards the thrust plate, thereby achieving load bearing on the thrust plate. At the same time, a portion of the hydraulic oil in the first inlet passage 110 enters the bypass passage 120, thereby driving the pilot valve core 510 to move towards the piston 20 and compress the elastic element 520, opening the second end of the drain passage 130, allowing the hydraulic oil to further drain through the drain passage 130 to avoid excessive oil pressure in the first chamber 30. If the load on the thrust plate increases, the thrust plate will push the piston 20 towards the cylinder body 10, thereby compressing the elastic element 520, increasing the compression of the elastic element 520, and thus increasing the elastic force of the elastic element 520 acting on the pilot valve core 510, causing the pilot valve core 510 to move away from the piston 20, thereby reducing the opening of the second end of the drain passage 130. Because the opening of the second end of the drain passage 130 decreases, the amount of oil drained by the drain passage 130 also decreases, thereby increasing the oil pressure in the first chamber 30 and increasing the load-bearing capacity of the piston 20 on the thrust plate. If the load on the thrust plate decreases, the piston 20 will move toward the thrust plate to reset, the compression of the elastic element 520 will decrease, and the pilot valve core 510 will move toward the piston 20 to increase the opening of the second end of the drain passage 130, thereby reducing the oil pressure in the first chamber 30 and reducing the load-bearing capacity of the piston 20 on the thrust plate.

[0050] In other words, the vibration damping cylinder provided in this embodiment can provide corresponding load-bearing capacity to the thrust plate according to the magnitude of the load, thereby achieving the effect of vibration damping. Furthermore, the vibration damping cylinder has a fast response, stable dynamic adjustment, long service life, and high reliability.

[0051] It should be noted that the cylinder body 10 also has an oil return passage (not shown in the figure) for returning the hydraulic oil in the damping cylinder to the oil tank.

[0052] See also Figure 1 In this embodiment, the piston 20 has a guide post 210 on the side facing the cylinder 10. The axial direction of the guide post 210 is consistent with the moving direction of the piston 20, and one end of the guide post 210 is movably located in the pilot cavity 40.

[0053] Since the axial direction of the guide post 210 is consistent with the moving direction of the piston 20, the guide post 210 can guide the moving direction of the piston 20, ensuring that the moving direction of the piston 20 remains unchanged and always consistent with the force direction of the thrust plate. In this way, the piston 20 can effectively bear the load applied by the thrust plate, thereby improving the reliability and vibration damping effect of the damping cylinder.

[0054] For example, the piston 20 is a cylindrical structure, and the guide post 210 is arranged coaxially with the piston 20, so that the guide post 210 is located at the center of the piston 20, which can better guide the piston 20.

[0055] In this embodiment, the pilot valve core 510 has a guide groove 530 on the side facing the elastic member 520. The length direction of the guide groove 530 is consistent with the moving direction of the pilot valve core 510, and one end of the guide post 210 is movably inserted into the guide groove 530.

[0056] Since the length direction of the guide groove 530 is consistent with the moving direction of the pilot valve core 510, the cooperation between the guide groove 530 and the guide post 210 can guide the moving direction of the pilot valve core 510, ensuring that the moving direction of the pilot valve core 510 remains unchanged, avoiding unnecessary shaking of the pilot valve core 510 in the first cavity 30, thereby accurately controlling the opening of the second end of the oil drain passage 130.

[0057] It should be noted that since the moving direction of the pilot valve core 510 is the same as the moving direction of the piston 20, and the moving direction of the guide post 210 is the same as the moving direction of the piston 20, the moving direction of the guide post 210 and the moving direction of the pilot valve core 510 are the same, so that the two will not interfere with each other during the movement.

[0058] In this embodiment, the elastic element 520 is a disc spring, and the elastic element 520 is sleeved on the guide post 210.

[0059] In the above implementation, the disc spring and the guide post 210 are arranged coaxially, which ensures that the compression direction of the disc spring is consistent with the axial direction of the guide post 210, avoids the problem of the disc spring being skewed during compression, and improves reliability.

[0060] For example, the outer peripheral wall of the guide post 210 has an outer flange, one end of the disc spring abuts against the outer flange, and the other end of the disc spring abuts against the pilot valve core 510, thereby achieving a stable installation of the disc spring and preventing the disc spring from detaching from the guide post 210.

[0061] In this embodiment, the pilot valve core 510 has a pointed tip 540 on the side facing away from the elastic member 520. When the pointed tip 540 is inserted into the second end of the bypass oil passage 120, the pilot valve core 510 closes the second end of the drain oil passage 130.

[0062] In the above implementation, the pointed end 540 is inserted into the second end of the bypass oil passage 120, and the pilot valve core 510 closes the second end of the drain oil passage 130. At this time, all the hydraulic oil in the first inlet oil passage 110 enters the first chamber 30, thereby applying the maximum force to the thrust plate through the piston 20.

[0063] Furthermore, since the tip 540 faces the second end of the bypass oil passage 120, when the hydraulic oil flows out from the second end of the bypass oil passage 120, it can contact the tip 540, thereby reducing the impact on the pilot valve core 510 and effectively improving the dynamic adjustment stability.

[0064] For example, the tip 540 and the pilot valve core 510 are integral structural components, which not only improves the structural strength between the tip 540 and the pilot valve core 510, but also improves manufacturing efficiency.

[0065] In order to further adapt to the high load of the thrust bearing and improve the load that the damping cylinder can bear, in this embodiment, the cylinder body 10 has a second oil inlet 150, the first end of the second oil inlet 150 penetrates the outer surface of the cylinder body 10, and a second cavity 60 is provided between the piston 20 and the cylinder body 10, the second cavity 60 being connected to the second end of the second oil inlet 150.

[0066] In the above implementation, hydraulic oil is introduced into the first end of the second oil inlet 150. The hydraulic oil enters the second cavity 60 through the second oil inlet 150, so that the piston 20 always has a tendency to move toward the thrust plate, thereby further improving the piston 20's load-bearing capacity on the thrust plate.

[0067] It should be noted that the first oil inlet 110 and the second oil inlet 150 can be supplied with oil separately or together, and this disclosure does not impose any restrictions on this.

[0068] When the first oil inlet 110 and the second oil inlet 150 are supplied with oil separately, oil can be supplied only through the first oil inlet 110 as needed, while the second oil inlet 150 is not supplied with oil. In this way, the energy consumption of the vibration damping cylinder is effectively reduced.

[0069] For example, the second cavity 60 is arranged around the first cavity 30.

[0070] This design not only avoids mutual interference between the first chamber 30 and the second chamber 60, but also ensures that the hydraulic oil in the first chamber 30 and the second chamber 60 applies a more even force to the piston 20, effectively improving the stability of dynamic adjustment.

[0071] For example, the first cavity 30 and the second cavity 60 are both located on the same side of the piston 20. The first cavity 30 is located in the middle of the piston 20, and it is an annular cavity arranged around the guide post 210 and coaxial with the piston 20. The second cavity 60 is located at the edge of the piston 20, and it is an annular cavity arranged around the first cavity 30 and coaxial with the piston 20.

[0072] See also Figure 1In this embodiment, the cylinder body 10 has a groove 140 on the side facing the piston 20, and the piston 20 has a boss 220 on the side facing the cylinder body 10. The boss 220 protrudes along the moving direction of the piston 20 and is movably inserted into the groove 140 to form a first cavity 30.

[0073] In the above implementation, the first cavity 30 is disposed between the boss 220 and the groove 140, ensuring the sealing of the first cavity 30. Furthermore, since the boss 220 protrudes along the moving direction of the piston 20, the cooperation between the boss 220 and the groove 140 effectively guides the relative movement between the piston 20 and the cylinder 10, thereby further improving the reliability of the damping cylinder.

[0074] For example, in order to further improve the sealing performance of the first cavity 30, a sealing ring is provided between the outer wall of the boss 220 and the inner wall of the groove 140.

[0075] In this embodiment, the cylinder body 10 has an annular groove 160 on the side facing the piston 20, and the piston 20 has a protruding ring 230 on the side facing the cylinder body 10. The protruding ring 230 protrudes along the moving direction of the piston 20 and is movably inserted into the annular groove 160 to form a second cavity 60.

[0076] In the above implementation, the second cavity 60 is disposed between the convex ring 230 and the annular groove 160, ensuring the sealing performance of the second cavity 60. Furthermore, since the convex ring 230 protrudes along the moving direction of the piston 20, the cooperation between the convex ring 230 and the annular groove 160 effectively guides the relative movement between the piston 20 and the cylinder 10, thereby further improving the reliability of the damping cylinder.

[0077] For example, in order to further improve the sealing performance of the second cavity 60, a sealing ring is provided between the outer wall of the piston 20 and the inner wall of the cylinder 10.

[0078] In this embodiment, the cylinder body 10 includes a main body 170 and an end cap 180. The end cap 180 is detachably and sealingly connected to the cylinder body 10 to form a pilot cavity 40 between the cylinder body 10 and the piston 20.

[0079] In the above implementation, since the cylinder body 10 is divided into two parts, the main body 170 and the end cover 180, and the end cover 180 is detachably connected to the cylinder body 10, when it is necessary to maintain or replace the pilot component 50 in the pilot cavity 40, only the end cover 180 needs to be removed, which effectively improves the convenience of maintenance for the vibration damping cylinder.

[0080] In this embodiment, the first oil inlet 110 and the second oil inlet 150 are parallel to each other, and the first end of the first oil inlet 110 and the first end of the second oil inlet 150 have the same orientation, which makes it convenient to simultaneously input hydraulic oil into the first oil inlet 110 and the second oil inlet 150.

[0081] In addition, the first end of the first oil inlet 110 is located at the end cap 180, and the first end of the second oil inlet 150 is located at the main body 170. This design can also prevent the first oil inlet 110 and the second oil inlet 150 from affecting each other when hydraulic oil is input separately.

[0082] The working process of the vibration damping cylinder is described below.

[0083] When the damping cylinder is working, hydraulic oil is supplied to the first end of the first oil inlet 110 and the first end of the second oil inlet 150 according to the maximum load on the thrust plate. If the maximum load on the thrust plate is small, hydraulic oil only needs to be supplied to the first end of the first oil inlet 110. The hydraulic oil enters the first cavity 30 through the first oil inlet 110 and enters the second cavity 60 through the second oil inlet 150, so that the piston 20 always has a tendency to move towards the thrust plate, thereby achieving the bearing of the thrust plate.

[0084] Simultaneously, a portion of the hydraulic oil in the first inlet passage 110 enters the bypass passage 120, thereby driving the pilot valve core 510 to move towards the piston 20 and compress the elastic element 520, opening the second end of the drain passage 130. This allows the hydraulic oil to further drain through the drain passage 130, preventing excessive oil pressure in the first chamber 30. If the load on the thrust plate increases, the thrust plate will push the piston 20 towards the cylinder 10, thereby compressing the elastic element 520, increasing the compression of the elastic element 520, and thus increasing the elastic force exerted by the elastic element 520 on the pilot valve core 510. This causes the pilot valve core 510 to move away from the piston 20, reducing the opening of the second end of the drain passage 130. Because the opening of the second end of the drain passage 130 decreases, the amount of oil drained from the drain passage 130 also decreases, thereby increasing the oil pressure in the first chamber 30 and increasing the load-bearing capacity of the piston 20 on the thrust plate. If the load on the thrust plate decreases, the piston 20 will move toward the thrust plate to reset accordingly, the compression of the elastic element 520 will decrease, and the pilot valve core 510 will move toward the piston 20 to increase the opening of the second end of the drain passage 130, thereby reducing the oil pressure in the first chamber 30 and reducing the load-bearing capacity of the piston 20 on the thrust plate.

[0085] In other words, the vibration damping cylinder provided in this embodiment can provide corresponding load-bearing capacity to the thrust plate according to the magnitude of the load, thereby achieving the effect of vibration damping. Furthermore, the vibration damping cylinder has a fast response, stable dynamic adjustment, long service life, and high reliability.

[0086] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0087] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A vibration damping cylinder, characterized in that, include: The cylinder block (10) has a first oil inlet passage (110), a bypass oil passage (120) and an oil drain passage (130). The first end of the first oil inlet passage (110) and the first end of the oil drain passage (130) both penetrate the outer surface of the cylinder block (10). The first end of the bypass oil passage (120) is connected to the first oil inlet passage (110). A piston (20) is partially movably inserted into the cylinder (10) to form a first cavity (30) and a pilot cavity (40) between the piston (20) and the cylinder (10). The first cavity (30) is connected to the second end of the first oil inlet passage (110). The pilot cavity (40) is connected to the second end of the bypass oil passage (120) and the second end of the drain passage (130). The piston (20) has a guide post (210) on the side facing the cylinder (10). The axial direction of the guide post (210) is consistent with the moving direction of the piston (20). One end of the guide post (210) is movably located in the pilot cavity (40). The pilot assembly (50) includes a pilot valve core (510) and an elastic element (520). The pilot valve core (510) is movably located within the pilot cavity (40), and the direction of movement of the pilot valve core (510) is consistent with the direction of movement of the piston (20). The elastic element (520) is sandwiched between the pilot valve core (510) and the piston (20). The pilot assembly (50) is configured such that the pilot valve core (510) moves toward the piston (20) and compresses the elastic element (520) under the oil pressure of the bypass oil passage (120) to open the second end of the drain passage (130).

2. The vibration damping cylinder according to claim 1, characterized in that, The pilot valve core (510) has a guide groove (530) on the side facing the elastic member (520); The length direction of the guide groove (530) is consistent with the moving direction of the pilot valve core (510); One end of the guide post (210) is movably inserted into the guide groove (530).

3. The vibration damping cylinder according to claim 1, characterized in that, The elastic element (520) is a disc spring, and the elastic element (520) is sleeved on the guide post (210).

4. The vibration damping cylinder according to claim 1, characterized in that, The pilot valve core (510) has a pointed tip (540) on the side opposite to the elastic member (520). When the tip (540) is inserted into the second end of the bypass oil passage (120), the pilot valve core (510) closes the second end of the drain passage (130).

5. The vibration damping cylinder according to claim 1, characterized in that, The cylinder (10) has a groove (140) on the side facing the piston (20). The piston (20) has a boss (220) on the side facing the cylinder (10), the boss (220) protrudes along the moving direction of the piston (20), and the boss (220) is movably inserted into the groove (140) to form the first cavity (30).

6. The vibration damping cylinder according to claim 1, characterized in that, The cylinder block (10) has a second oil inlet passage (150), the first end of which penetrates the outer surface of the cylinder block (10); A second cavity (60) is provided between the piston (20) and the cylinder (10), and the second cavity (60) is connected to the second end of the second oil inlet (150).

7. The vibration damping cylinder according to claim 6, characterized in that, The second cavity (60) is arranged around the first cavity (30).

8. The vibration damping cylinder according to claim 6, characterized in that, The cylinder (10) has an annular groove (160) on the side facing the piston (20). The piston (20) has a protruding ring (230) on the side facing the cylinder (10). The protruding ring (230) protrudes along the moving direction of the piston (20) and is movably inserted into the ring groove (160) to form the second cavity (60).

9. The vibration damping cylinder according to claim 1, characterized in that, The cylinder (10) includes a main body (170) and an end cap (180). The end cap (180) is detachably and sealingly connected to the cylinder (10) to form the pilot cavity (40) between the cylinder (10) and the piston (20).

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