An oil-gas hybrid shock absorber

Abstract

The present application discloses an oil-gas hybrid shock absorber, which relates to the technical field of shock absorption. It includes 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 hydraulic oil is filled in the first cavity; a second cylinder, the second cylinder is connected to the first piston, and a diversion 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, and gas is filled in the second cavity. The second piston abuts against the first piston so that the first cavity does not communicate with the cylinder cavity of the second cylinder. The present application optimizes the specific structure of the shock absorber, and through the cooperation of hydraulic oil and air, by utilizing the compressibility of air, it effectively reduces the impact brought 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.

Description

Technical Field

[0001] This application relates to the technical field of shock absorption, and particularly to a hybrid oil-gas shock absorber. Background Art

[0002] Currently, shock absorbers mainly include helical spring shock absorbers and rubber intestine bladder (air film) shock absorbers. These shock absorbers are mainly used in working environments with medium and small loads, such as automobiles and equipment platforms. For large load shock absorbers, rubber blocks are mostly used. Due to the high natural frequency of rubber blocks themselves, they cannot isolate vibrations with medium and low frequencies and large amplitudes. Summary of the Invention

[0003] This application aims to solve one of the above technical problems in the prior art. For this purpose, an embodiment of this application provides a hybrid oil-gas shock absorber.

[0004] According to an embodiment of this application, a hybrid oil-gas shock absorber is provided, including 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 hydraulic oil is filled in the first cavity. A second cylinder is connected to the first piston. A diversion 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, and gas is filled in the second cavity. The second piston abuts against the first piston so that the first cavity does not communicate with the cylinder cavity of the second cylinder.

[0005] The above hybrid oil-gas shock absorber has at least the following beneficial effects: This application adopts a double-cylinder structure, effectively improving space utilization rate and making 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 applied to the end of the second cylinder, a pressure difference is generated between the first cavity and the second cavity. The second cylinder drives the first piston to move and compress the hydraulic oil in the first cavity. The amount of hydraulic oil that can be compressed is small. When the load is large enough, the hydraulic oil flows through the diversion structure into the cylinder cavity of the second cylinder under the action of pressure. The hydraulic oil also cooperates with the diversion structure to push the second piston to compress the high-pressure gas in the second cavity. The reaction force generated after the high-pressure gas is compressed becomes the supporting force for supporting the load. The high-pressure gas with a high enough pressure generates a strong reaction force on the second piston per unit area to support the large load, avoiding further compression and achieving the purpose of buffering and shock absorption at the same time. This application optimizes the specific structure of the shock absorber, and through the cooperation of hydraulic oil and air, using the compressibility of air, effectively reduces the impact brought by vibrations. Compared with the prior art, the hybrid oil-gas shock absorber of this application can also effectively isolate low-frequency vibrations and impacts.

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

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

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

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

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

[0011] According to the oil-gas hybrid shock absorber described in the embodiments of the present application, the guiding hole includes a first section and a second section. The first section close to the first cavity is in clearance fit with the first diversion member, and the docking end of the second piston enters the second section and abuts against the first diversion member. The diameter of the second section is larger than that of the first section.

[0012] According to the oil-gas hybrid shock absorber described in the embodiments of the present application, the docking end has a buffer cavity, the buffer cavity seals the open end of the fourth cavity, and a release hole is provided in the buffer cavity 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 embodiments of the present application, the second cylinder barrel is threadedly connected to the first piston, and the first piston seals the open end of the cylinder cavity of the first cylinder barrel.

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

[0015] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Brief Description of the Drawings

[0016] The present application will be further described below in conjunction with the drawings and embodiments;

[0017] Figure 1 is a structural schematic diagram of an embodiment of the present application Figure 1 ;

[0018] Figure 2 is a structural schematic diagram of an embodiment of the present application Figure 2 ;

[0019] Figure 3 is a structural schematic diagram of an embodiment of the present application Figure 3 ;

[0020] Figure 4 is a structural schematic diagram of an embodiment of the present application Figure 4 .

[0021] Reference Signs:

[0022] First cylinder 100, first cavity 101, oil injection plug 110, first piston 120, second sealing ring 121, second guide ring 122;

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

[0024] First flow guiding member 300, fourth cavity 301, overflow hole 310, first sealing ring 320. Detailed Description of the Embodiments

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

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present application.

[0027] In the description of the present application, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceeding", etc. are understood not to include the recited number, and "above", "below", "within", etc. are understood to include the recited number. If "first" and "second" are described, they are only used to distinguish technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0028] In the description of the present application, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

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

[0030] Wherein, a first piston 120 is arranged 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 hydraulic oil is filled in the first cavity 101.

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

[0032] Specifically, the first cylinder 100 serves as an outer cylinder. 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, during use, hydraulic oil is filled in the first cavity 101 formed by the first piston 120 and the first cylinder 100. The second piston 220 of the second cylinder 200 is moved to abut against the first piston 120, and gas with a certain pressure is filled into the second cavity 201 to keep the second piston 220 pressing against the first piston 120. At this time, the second cavity 201 is not communicated with the first cavity 101. Among them, the gas in the second cavity 201 is nitrogen. During operation, the first cylinder 100 serves as a fixed end, and the second cylinder 200 serves as a movable end and is connected to a load.

[0033] Compared with the prior art, the present application optimizes the structure and working principle of the entire shock absorber. By adopting a double-cylinder structure, the space utilization rate is effectively improved, and the shock absorption range of the entire shock absorber is made 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 gravity is applied to the end of the second cylinder 200, 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 compressible amount of the hydraulic oil is small. When the load is large enough, the hydraulic oil flows through the diversion structure to the cylinder cavity of the second cylinder 200 under the action of pressure. The hydraulic oil also cooperates with the diversion 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 for supporting the load. The gas with a high enough pressure generates a strong reaction force on the second piston 220 per unit area to support the large load, avoiding further compression, and at the same time achieving the purpose of buffering and shock absorption.

[0035] The present application optimizes the specific structure of the shock absorber, and through the cooperation 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 diversion structure includes a first diversion member 300. The first diversion member 300 is fixed to the first cavity 101. The first diversion member 300 is sealingly connected to the first piston 120. When the first piston 120 compresses the space of the first cavity 101, the first diversion 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 first diversion member 300.

[0037] It should be noted that during the process of the first piston 120 compressing the first cavity 101, the first diversion member 300 passes through the first piston 120 and pushes against the second piston 220 to compress the second cavity 201, so as to form a third cavity for storing hydraulic oil between the first piston 120 and the second piston 220.

[0038] Specifically, when the oil-gas hybrid shock absorber of the present application works, a large load compresses the second cylinder body, and the second rod body pushes the first piston 120 to compress the first cavity 101. Since the first flow guide member 300 is fixed inside the first cavity 101, and the first piston 120 is hermetically connected to the first flow guide member 300, and during the compression of the first cavity 101, when the first flow guide member 300 enters the cylinder cavity of the second cylinder 200, it can simultaneously direct the hydraulic oil to the cylinder cavity of the second cylinder 200, that is, into the third cavity. Under the action of the first flow guide member 300 cooperating with the hydraulic oil, the second piston 220 is pushed away from the first piston 120, and the second piston 220 moves to compress the gas in the second cavity 201. Therefore, the linear motion of the second cylinder body can be converted into the motion of compressing the gas in the second cavity 201. Since the compression process is a non-linear 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 301. One end of the first flow guide member 300 is fixed inside the first cavity 101 through an oil injection plug 110 provided at the bottom of the first cylinder 100. The oil injection plug 110 is used to inject hydraulic oil into the first cavity 101. The oil injection plug 110 is threadedly connected to the first flow guide member 300. Among them, one end of the fourth cavity 301 is sealed and the other end is open. When the first flow guide member 300 abuts against the second piston 220, the open end of the fourth cavity 301 faces the second piston 220.

[0040] Furthermore, the first flow guide member 300 is provided with a plurality of overflow holes 310. The overflow holes 310 are arranged at intervals along the axial direction of the first flow guide member 300. The overflow holes 310 communicate the fourth cavity 301 with the first cavity 101.

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

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

[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 hydraulic oil flowing into the third cavity 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, 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 docking end has a buffer cavity, the buffer cavity seals the opening of the fourth cavity 301, and the buffer cavity is provided with a release hole 223, so that the hydraulic oil in the fourth cavity 301 can enter between the first piston 120 and the second piston 220 through the release hole 223. This effectively avoids the occurrence of contact shock under rapid compression, making the shock absorption effect smoother and more effective.

[0049] In some embodiments, the second cylinder 200 is threadedly connected to the first piston 120, and the first piston 120 seals the opening of the cylinder cavity 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 cavity opening of the second cylinder 200, so that the first piston 120 can be fixed to the cylinder opening of the second cylinder 200, effectively sealing the cylinder cavity of the second cylinder 200. At the same time, the outer cylinder body of the second cylinder 200 also has a clearance fit with the inner wall of the cylinder cavity of the first cylinder 100.

[0051] 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 setting of the first guide ring 230 enables the first piston 120 and the second cylinder 200 to achieve coaxial sliding, ensuring smooth movement.

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

[0053] Compared with rubber shock absorption in the prior art, the oil-gas hybrid shock absorber of the present application can carry a large load in a small space, and is used for anti-collision at the end of the stroke of large-tonnage electric cylinders or large robotic arms and to assist in reducing the probability of motor burnout caused by excessive starting current during startup.

[0054] For example, when applied to aircraft landing gears, large-tonnage armored vehicles, etc., the oil-gas hybrid shock absorber of the present application can isolate low-frequency vibrations and impacts even for large loads.

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

[0056] The above has described the embodiments of the present application in detail with reference to the drawings, but the present application is not limited to the above embodiments. Various changes can be made without departing from the purpose of the present application within the scope of knowledge possessed by those of ordinary skill in the art.

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, the second cylinder is connected to the first piston, a flow guide structure provided on the first piston enables the first cavity to communicate with the cylinder cavity of the second cylinder, a second piston is provided 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; The flow guide structure includes a first flow guide member, which is fixed to the first cavity and is 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 first flow guide member. When the first piston compresses the first cavity, the first flow guide 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; The first flow guide has a fourth cavity therein, and the first flow guide is provided with a plurality of overflow holes, and the overflow holes connect the fourth cavity with the first cavity; The first piston has a guide hole for the first flow guide to pass through, the guide hole includes a first section and a second section, the first section close to the first cavity is in clearance fit with the first flow guide, the butt end of the second piston enters the second section to abut against the first flow guide, and the diameter of the second section is greater than the diameter of the first section; 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.

2. The oil-gas hybrid shock absorber according to claim 1, characterized in that: The overflow holes are arranged at intervals along the axial direction of the first flow guide member.

3. The oil-gas hybrid shock absorber according to claim 2, 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.

4. The oil-gas hybrid shock absorber according to claim 1, characterized in that: A first sealing ring is arranged between the guide hole and the first flow guide member.

5. 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.

6. The oil-gas hybrid shock absorber according to claim 5, 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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