Oil-gas mixing shock absorber

Abstract

The invention discloses an oil-gas mixing shock absorber, and relates to the technical field of shock absorption, the oil-gas mixing shock absorber comprises a first cylinder barrel, a first piston is arranged in a cylinder cavity of the first cylinder barrel, a first cavity is formed between the first piston and the first cylinder barrel, and the first cavity is filled with hydraulic oil; the second cylinder barrel is connected with the first piston, a flow guide structure arranged on the first piston enables the first cavity to be communicated with a cylinder cavity of the second cylinder barrel, the second piston is arranged in the cylinder cavity of the second cylinder barrel, a second cavity is formed between the second cylinder barrel and the second piston, the second cavity is filled with gas, and the second piston abuts against the first piston. And the first cavity is not communicated with the cylinder cavity of the second cylinder barrel. According to the oil-gas mixed shock absorber, the specific structure of the shock absorber is optimized, the hydraulic oil is matched with the air, the compressibility of the air is utilized, impact caused by shock is effectively reduced, and compared with the prior art, the oil-gas mixed shock absorber can effectively isolate low-frequency shock and impact.

Description

Technical Field

[0001] The present application relates to the technical field of shock absorption, and in particular to an oil-gas hybrid shock absorber. Background Art

[0002] At present, shock absorbers are mainly coil spring shock absorbers and rubber intestine bag (air film) shock absorbers. These shock absorbers are mainly used in working environments with small and medium loads, such as automobiles, equipment platforms, etc. Large load shock absorbers mostly use rubber blocks. Due to the high inherent frequency of the rubber blocks themselves, they cannot isolate medium and low frequency and large amplitude vibrations. Summary of the invention

[0003] The present application aims to solve one of the above technical problems in the prior art. To this end, an embodiment of the present application provides an oil-gas hybrid shock absorber.

[0004] According to an embodiment of the present application, an oil-gas hybrid shock absorber is provided, comprising a first cylinder, a first piston is arranged in the cylinder cavity of the first cylinder, a first cavity is formed between the first piston and the first cylinder, and the first cavity is filled with hydraulic oil; a second cylinder, the second cylinder is connected to the first piston, a guide structure arranged on the first piston enables the first cavity to connect to the cylinder cavity of the second cylinder, a second piston is arranged in the cylinder cavity of the second cylinder, a second cavity is formed between the second cylinder and the second piston, the second cavity is filled with gas, and the second piston abuts the first piston so that the first cavity is not connected to the cylinder cavity of the second cylinder.

[0005] The above oil-gas hybrid shock absorber has at least the following beneficial effects: the present application adopts a double-cylinder structure, which effectively improves the space utilization rate and makes the shock absorption range of the entire shock absorber larger. At the same time, a double-piston structure is adopted, and the second cylinder working inside is used as the outer piston rod of the first cylinder. When a large load gravity is loaded on the end of the second cylinder, a pressure difference is generated between the first cavity and the second cavity, and the second cylinder drives the first piston to move and compress the hydraulic oil in the first cavity. The hydraulic oil can be compressed to a small amount. When the load is large enough, the hydraulic oil flows to the cylinder cavity of the second cylinder through the guide structure under the action of pressure. The hydraulic oil also cooperates with the guide structure to push the second piston to compress the high-pressure gas in the second cavity. The reaction force generated by the high-pressure gas after being compressed becomes the supporting force to support the load. The gas with sufficiently high pressure generates a strong reaction force on the second piston per unit area to support the large load, avoiding further compression, and also achieving the purpose of buffering and shock absorption. The present application optimizes the specific structure of the shock absorber, and through the combination of hydraulic oil and air, utilizes the compressibility of air to effectively reduce the impact caused by vibration. Compared with the prior art, the oil-gas hybrid shock absorber of the present application can also effectively isolate low-frequency vibrations and impacts.

[0006] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, the flow guide structure includes a first flow guide member, the first flow guide member is fixed to the first cavity, the first flow guide member is sealingly connected to the first piston, when the first piston compresses the space of the first cavity, the first flow guide member can enter the cylinder cavity of the second cylinder, and the hydraulic oil in the first cavity is guided to the cylinder cavity of the second cylinder through the flow guide member.

[0007] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, during the process of the first piston compressing the first cavity, the first flow guide member passes through the first piston and pushes against the second piston to compress the second cavity, so that a third cavity for storing hydraulic oil is formed between the first piston and the second piston.

[0008] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, a fourth cavity is provided in the first flow guide member, and the first flow guide member is provided with a plurality of overflow holes, the overflow holes are arranged at intervals along the axial direction of the first flow guide member, and the overflow holes connect the fourth cavity with the first cavity.

[0009] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, the diameter of the overflow hole gradually decreases from the overflow hole closest to the second piston to the overflow hole farthest from the second piston.

[0010] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, the first piston has a guide hole for the first guide member to pass through, and a first sealing ring is arranged between the guide holes.

[0011] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, the guide hole includes a first section and a second section, the first section close to the first cavity is gap-matched with the first guide member, the butt end of the second piston enters the second section and abuts the first guide member, and the diameter of the second section is larger than the diameter of the first section.

[0012] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, the docking end has a buffer cavity, which blocks the opening of the fourth cavity. The buffer cavity is provided with a release hole so that the hydraulic oil in the fourth cavity can enter between the first piston and the second piston through the release hole.

[0013] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, the second cylinder is connected to the first piston through threads, and the first piston blocks the cylinder cavity opening of the first cylinder.

[0014] According to the oil-gas hybrid shock absorber described in the embodiment of the present application, a first guide ring is arranged in the first cylinder, and the first guide ring is sleeved outside the second cylinder.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application is further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 This is a schematic diagram of the structure of the embodiment of the present application. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the embodiment of the present application. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the structure of the embodiment of the present application. Figure 3 ;

[0020] Figure 4 This is a schematic diagram of the structure of the embodiment of the present application. Figure 4 .

[0021] Reference numerals:

[0022] A first cylinder 100, a first cavity 101, an oil filling plug 110, a first piston 120, a second sealing ring 121, and a second guide ring 122;

[0023] The second cylinder 200, the second cavity 201, the gas injection plug 210, the second piston 220, the third sealing ring 221, the third guide ring 222, the release hole 223, and the first guide ring 230;

[0024] A first flow guide 300 , a third cavity 301 , an overflow hole 310 , and a first sealing ring 320 . DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0026] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 application.

[0027] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0029] Reference Figures 1 to 4 An embodiment of the present application provides an oil-gas hybrid shock absorber, which includes a first cylinder 100 and a second cylinder 200 .

[0030] A first piston 120 is disposed in the cylinder cavity of the first cylinder 100 , a first cavity 101 is formed between the first piston 120 and the first cylinder 100 , and the first cavity 101 is filled with hydraulic oil.

[0031] The second cylinder 200 is connected to the first piston 120. The guide structure arranged on the first piston 120 enables the first cavity 101 to communicate with the cylinder cavity of the second cylinder 200. The second piston 220 is arranged in the cylinder cavity of the second cylinder 200. A second cavity 201 is formed between the second cylinder 200 and the second piston 220. The second cavity 201 is filled with gas. The second piston 220 abuts against the first piston 120 so that the first cavity 101 is not connected with the cylinder cavity of the second cylinder 200.

[0032] Specifically, the first cylinder 100 is used as an outer cylinder, and the second cylinder 200 is connected to the first piston 120 in the first cylinder 100 and becomes the piston of the first cylinder 100. At the same time, when in use, the first cavity 101 formed by the first piston 120 and the first cylinder 100 is filled with hydraulic oil, so that the second piston 220 of the second cylinder 200 moves to abut against the first piston 120, and a certain pressure of gas is filled into the second cavity 201, so that the second piston 220 maintains pressing against the first piston 120. At this time, the second cavity 201 is not connected to the first cavity 101, wherein the gas in the second cavity 201 is nitrogen. When working, the first cylinder 100 is used as a fixed end, and the second cylinder 200 is used as a movable end and connected to the load.

[0033] Compared with the prior art, the present application optimizes the structure and working principle of the entire shock absorber, adopts a double-cylinder structure, effectively improves space utilization, and makes the shock absorbing range of the entire shock absorber larger. At the same time, a double-piston structure is adopted, and the second cylinder 200 working inside is used as the outer piston rod of the first cylinder 100.

[0034] When a large load is loaded on the end of the second cylinder 200 by gravity, a pressure difference is generated between the first cavity 101 and the second cavity 201. The second cylinder 200 drives the first piston 120 to move and compress the hydraulic oil in the first cavity 101. The hydraulic oil can be compressed a small amount. When the load is large enough, the hydraulic oil flows to the cylinder cavity of the second cylinder 200 through the guide structure under the action of pressure. The hydraulic oil also cooperates with the guide structure to push the second piston 220 to compress the high-pressure gas in the second cavity 201. The reaction force generated after the high-pressure gas is compressed becomes the supporting force to support the load. The gas with sufficiently high pressure generates a strong reaction force on the second piston 220 per unit area to support the large load and avoid further compression. At the same time, the purpose of buffering and shock absorption is also achieved.

[0035] The present application optimizes the specific structure of the shock absorber, and through the combination of hydraulic oil and air, utilizes the compressibility of air to effectively reduce the impact caused by vibration. Compared with the prior art, the oil-gas hybrid shock absorber of the present application can also effectively isolate low-frequency vibrations and impacts.

[0036] In some embodiments, the flow guide structure includes a first flow guide member 300, which is fixed to the first cavity 101. The first flow guide member 300 is sealed and connected to the first piston 120. When the first piston 120 compresses the space of the first cavity 101, the first flow guide member 300 can enter the cylinder cavity of the second cylinder 200, and the hydraulic oil in the first cavity 101 is guided to the cylinder cavity of the second cylinder 200 through the flow guide member.

[0037] It should be noted that when the first piston 120 compresses the first cavity 101 , the first flow guide 300 passes through the first piston 120 and pushes against the second piston 220 to compress the second cavity 201 , so that a third cavity 301 for storing hydraulic oil is formed between the first piston 120 and the second piston 220 .

[0038] Specifically, when the oil-gas hybrid shock absorber of the present application is working, a large load compresses the second cylinder body, and the second rod body pushes the first piston 120 to compress the first cavity 101. Because the first guide member 300 is fixed in the first cavity 101, and the first piston 120 is sealed and connected to the first guide member 300, and during the compression of the first cavity 101, the first guide member 300 can simultaneously guide the hydraulic oil to the cylinder cavity of the second cylinder 200 when entering the cylinder cavity of the second cylinder 200, that is, the third cavity 301. Under the action of the first guide member 300 and the hydraulic oil, the second piston 220 is pushed away from the first piston 120, and the second piston 220 moves to compress the second cavity 201, so that the linear motion of the second cylinder body can be converted into the motion of the steel tooth gas compressing the second cavity 201. Because the compression process is a nonlinear process, it can effectively reduce the vibration of the load and play a buffering role.

[0039] In some embodiments, the first flow guide member 300 has a fourth cavity therein, and one end of the first flow guide member 300 is fixed to the inside of the first cavity 101 through an oil filling plug 110 arranged at the bottom of the first cylinder 100, and the oil filling plug 110 is used to inject hydraulic oil into the first cavity 101. The oil filling plug 110 is connected to the first flow guide member 300 by threads, wherein one end of the fourth cavity is closed and one end is open, and when the first flow guide member 300 abuts against the second piston 220, the open end of the fourth cavity faces the second piston 220.

[0040] Furthermore, the first flow guide 300 is provided with a plurality of overflow holes 310 , and the overflow holes 310 are arranged at intervals along the axial direction of the first flow guide 300 , and the overflow holes 310 connect the fourth cavity with the first cavity 101 .

[0041] When the load gravity is applied to the end of the second cylinder 200, the first piston 120 is driven to move and compress the hydraulic oil in the first cavity 101. Under the action of pressure, the hydraulic oil flows from the overflow hole 310 of the first guide member 300 to the third cavity 301 of the first guide member 300, and then is guided through the third cavity 301 to between the first piston 120 and the second piston 220, that is, to the cylinder cavity of the second cylinder 200.

[0042] Furthermore, the diameter of the overflow hole 310 gradually decreases from the overflow hole 310 closest to the second piston 220 to the overflow hole 310 farthest from the second piston 220 .

[0043] When the first piston 120 gradually compresses the first cavity 101, since the position of the first piston 120 sealing the first guide member 300 gradually moves away from the second piston 220, the number of overflow holes 310 exposed in the first cavity 101 gradually decreases, that is, the flow area of ​​the overflow holes 310 also gradually decreases, and thus the flow rate of the hydraulic oil flowing into the third cavity 301 also gradually decreases. Therefore, the resistance generated by compressing the first cavity 101 also gradually increases, which can effectively prevent the first piston 120 from hitting the bottom of the first cylinder 100 and damaging the shock absorber and the load when pulse vibration occurs.

[0044] In some embodiments, the first piston 120 has a guide hole for the first guide member 300 to pass through, and a first sealing ring 320 is arranged between the guide holes. The first sealing ring 320 seals the gap between the first guide member 300 and the first piston 120 to prevent the hydraulic oil from leaking from the gap between the first guide member 300 and the guide hole to affect the shock absorption effect.

[0045] In some embodiments, a second guide ring 122 and a second sealing ring 121 are also provided between the first piston 120 and the first cylinder 100 . The second guide ring 122 is used to guide the first piston 120 , and the second sealing ring 121 can prevent the hydraulic oil from leaking from the gap between the first piston 120 and the first cavity 101 .

[0046] In some embodiments, a third guide ring 222 and a third sealing ring 221 are arranged between the second piston 220 and the second cylinder 200 . The second guide ring 222 is used to guide the second piston 220 , and the third sealing ring 221 can prevent hydraulic oil or gas from leaking from the gap between the second piston 220 and the second cavity 201 .

[0047] In some specific embodiments, the guide hole includes a first section and a second section, the first section close to the first cavity 101 is in clearance with the first guide member 300, so that the first guide member 300 can slide, the butt end of the second piston 220 enters the second section to abut the first guide member 300, and the diameter of the second section is larger than the diameter of the first section. It can be seen that after the second piston 220 abuts the first piston 120, because the diameter of the second section is larger than the diameter of the first section, there is a certain buffer space between the first piston 120 and the second piston 220 for the flow of hydraulic oil. At the same time, the butt end may not completely block the open part of the third cavity 301, so that when the working pressure is applied, the hydraulic oil can flow smoothly between the first piston 120 and the second piston 220, effectively preventing the occurrence of contact shock waves.

[0048] In some specific embodiments, the butt end has a buffer cavity, which blocks the opening of the fourth cavity, and the buffer cavity is provided with a release hole 223, so that the hydraulic oil in the fourth cavity can enter between the first piston 120 and the second piston 220 through the release hole 223. The situation of contact shock wave caused by rapid pressure is effectively avoided, making the shock absorption effect more gentle and effective.

[0049] In some embodiments, the second cylinder 200 is connected to the first piston 120 via threads, and the first piston 120 blocks the cylinder cavity opening of the first cylinder 100 .

[0050] In a specific embodiment, an external thread is provided on the outer side of the first piston 120, and an internal thread is provided at the cylinder opening of the second cylinder 200, so that the first piston 120 is fixed to the cylinder opening of the second cylinder 200, and the cylinder of the second cylinder 200 is effectively sealed. At the same time, the outer cylinder body of the second cylinder 200 also matches the inner wall of the cylinder of the first cylinder 100 with a clearance.

[0051] In order to make the movement of the second cylinder 200 smoother, a first guide ring 230 is provided in the first cylinder 100, and the first guide ring 230 is sleeved outside the second cylinder 200. The provision of the first guide ring 230 enables the first piston 120 and the second cylinder 200 to slide coaxially, ensuring smooth movement.

[0052] In some embodiments, a gas injection plug 210 is disposed at the bottom of the second cylinder 200 , and the gas injection plug 210 is used to inject nitrogen into the second cavity 201 .

[0053] Compared with the prior art of shock absorption by rubber, the oil-gas hybrid shock absorber of the present application can carry a large load in a small space, and is used for collision prevention at the end of the stroke of a large-tonnage electric cylinder or a large mechanical arm, and helps reduce the probability of burning caused by excessive starting current of the motor during startup.

[0054] For example, when used in aircraft landing gear, large-tonnage armored vehicles, etc., the oil-gas hybrid shock absorber of the present application can isolate low-frequency vibrations and shocks even under large loads.

[0055] The oil-gas hybrid shock absorber of the present application can also be used in environments that have quality requirements for shock absorbers, such as space equipment and aerospace vehicles.

[0056] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. An oil-gas hybrid shock absorber, characterized in that: include A first cylinder, wherein a first piston is disposed in a cylinder cavity of the first cylinder, a first cavity is formed between the first piston and the first cylinder, and the first cavity is filled with hydraulic oil; a second cylinder, wherein the second cylinder is connected to the first piston, a flow guide structure arranged on the first piston enables the first cavity to communicate with the cylinder cavity of the second cylinder, a second piston is arranged in the cylinder cavity of the second cylinder, a second cavity is formed between the second cylinder and the second piston, the second cavity is filled with gas, and the second piston abuts against the first piston so that the first cavity is not communicated with the cylinder cavity of the second cylinder.

2. The oil-gas hybrid shock absorber according to claim 1, characterized in that: The flow guide structure includes a first flow guide member, which is fixed to the first cavity and sealed to the first piston. When the first piston compresses the space of the first cavity, the first flow guide member can enter the cylinder cavity of the second cylinder, and the hydraulic oil in the first cavity is guided to the cylinder cavity of the second cylinder through the flow guide member.

3. The oil-gas hybrid shock absorber according to claim 2, characterized in that: During the process of the first piston compressing the first cavity, the first flow guide member passes through the first piston and pushes against the second piston to compress the second cavity, so that a third cavity for storing hydraulic oil is formed between the first piston and the second piston.

4. The oil-gas hybrid shock absorber according to claim 2 or 3, characterized in that: The first flow guide has a fourth cavity therein, and the first flow guide is provided with a plurality of overflow holes, the overflow holes are arranged at intervals along the axial direction of the first flow guide, and the overflow holes connect the fourth cavity with the first cavity.

5. The oil-gas hybrid shock absorber according to claim 4, characterized in that: The diameters of the overflow holes gradually decrease from the overflow hole closest to the second piston to the overflow hole farthest from the second piston.

6. The oil-gas hybrid shock absorber according to claim 4, characterized in that: The first piston has a guide hole for the first flow guide to pass through, and a first sealing ring is arranged between the guide holes.

7. The oil-gas hybrid shock absorber according to claim 6, characterized in that: The guide hole includes a first section and a second section. The first section close to the first cavity is clearance-matched with the first guide member. The butt end of the second piston enters the second section and abuts against the first guide member. The diameter of the second section is greater than that of the first section.

8. The oil-gas hybrid shock absorber according to claim 7, characterized in that: The butt end has a buffer cavity, which blocks the opening of the fourth cavity. The buffer cavity is provided with a release hole so that the hydraulic oil in the fourth cavity can enter between the first piston and the second piston through the release hole.

9. The oil-gas hybrid shock absorber according to claim 1, characterized in that: The second cylinder is connected to the first piston via threads, and the first piston blocks the cylinder cavity opening of the first cylinder.

10. The oil-gas hybrid shock absorber according to claim 9, characterized in that: A first guide ring is arranged in the first cylinder, and the first guide ring is sleeved outside the second cylinder.

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