Bidirectional hydraulic damping gas spring

Abstract

The utility model discloses a bidirectional hydraulic damping gas spring, which comprises a cylinder body, a pneumatic piston rod and a hydraulic piston rod, a partition part is arranged in the cylinder body, and the partition part divides the internal space of the cylinder body into a gas cavity and an oil cavity; the air pressure piston rod extends into the cylinder body from the end, close to the air cavity, of the cylinder body, a first piston part is arranged at the end, extending into the cylinder body, of the air pressure piston rod, and the first piston part is located in the air cavity; the hydraulic piston rod comprises a first rod body, the first rod body extends into the cylinder body from the end, close to the oil cavity, of the cylinder body, and a second piston part is arranged at the tail end, extending into the cylinder body, of the first rod body. The ends, away from the cylinder body, of the air pressure piston rod and the first rod body are both connected with connecting parts. The utility model discloses a bidirectional hydraulic damping gas spring.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas springs, and specifically refers to a two-way hydraulic damping gas spring. Background Art

[0002] In modern industry and daily life, as an important support and buffer element, gas springs are widely used in fields such as furniture, seats, doors and windows, and mechanical equipment. Traditional gas springs mainly rely on the pressure change of gas to achieve the support and buffer functions, but there are some obvious deficiencies: First, traditional gas springs usually only use the pressure change of gas to provide buffering. Due to relying only on gas pressure, when facing large loads or rapid movements, the buffering performance of traditional gas springs often fails to meet the requirements, which may lead to equipment damage or a decline in the usage experience; Second, during long-term use or in harsh environments, traditional gas springs may experience gas leakage, affecting their performance and service life; In the case of being compressed to the limit or stretched to the limit, traditional gas springs often lack an effective secondary buffering mechanism and cannot provide additional protection in the extreme state. Content of the Utility Model

[0003] In order to solve the above problems in the prior art, the utility model proposes a two-way hydraulic damping gas spring, which can...

[0004] To solve the above technical problems, the technical solution adopted by the utility model is as follows: A two-way hydraulic damping gas spring includes a cylinder body, a pneumatic piston rod, and a hydraulic piston rod. A partition part is provided inside the cylinder body, and the partition part divides the internal space of the cylinder body into a gas chamber and an oil chamber. The gas chamber is filled with nitrogen, and the oil chamber is filled with hydraulic oil;

[0005] The pneumatic piston rod extends into the cylinder body from one end of the cylinder body close to the gas chamber. A first piston part is provided at the end of the pneumatic piston rod extending into the cylinder body. The first piston part is located in the gas chamber, and the pneumatic piston rod can drive the first piston part to move in the gas chamber;

[0006] The hydraulic piston rod includes a first rod body which extends into the cylinder block from one end of the cylinder block close to the oil chamber. A second piston portion is provided at the end of the first rod body extending into the cylinder block. The first rod body can drive the second piston portion to move in the oil chamber, and the hydraulic oil in the oil chamber flows from one side of the second piston portion to the other side at a certain rate. Connecting portions are connected to one end of the pneumatic piston rod and the first rod body away from the cylinder block. The gas spring is connected to two relatively movable components through the connecting portions to play a role in support and buffering. When the gas spring is compressed, the force required to push the pneumatic piston rod into the cylinder block is greater than the force required to push the hydraulic piston rod into the cylinder block. The pneumatic piston rod is pushed first and drives the first piston portion to move in the air chamber. The air pressure on the side of the first piston portion close to the oil chamber increases, which can slow down the speed of the pneumatic piston rod being pushed in and play a buffering role. When the force required to continue pushing the pneumatic piston rod into the cylinder block is greater than the force required to push the hydraulic piston rod into the cylinder block, the hydraulic piston rod starts to be pushed into the cylinder block. The second piston portion in the oil chamber moves towards the side close to the air chamber. Due to the damping characteristic of the liquid, the movement speed of the second piston portion can be slowed down, which can play a role in buffering and smooth movement, slow down the speed of the hydraulic piston rod being pushed in, and continue to play a buffering role.

[0007] Further, the hydraulic piston rod further includes a second rod body which passes through the partition portion. Both ends of the second rod body are respectively located in the air chamber and the oil chamber. A third piston portion is provided at one end of the second rod body located in the air chamber, and one end of the second rod body located in the oil chamber is connected to the end of the first rod body. When the gas spring is compressed by an external force, both the pneumatic piston rod and the hydraulic piston rod extend into the cylinder block. At this time, the volume between the first piston portion and the third piston portion becomes smaller and the air pressure increases. When the external force applied to the gas spring is removed, both the pneumatic piston rod and the hydraulic piston rod are pushed outwards and can still play a secondary buffering role when being compressed next time.

[0008] Further, sealing rings are provided at both ends of the oil chamber, and the sealing rings are used to prevent the leakage of hydraulic oil.

[0009] Further, a stud is provided at one end of the first rod body close to the second rod body, and a threaded hole is provided at one end of the second rod body close to the first rod body. The stud is screwed into the threaded hole, and the first rod body and the second rod body are connected through the cooperation of the stud and the threaded hole.

[0010] Further, both the pneumatic piston rod and the hydraulic piston rod can be completely extended into the cylinder block.

[0011] Further, when the pneumatic piston rod and the hydraulic piston rod are fully inserted into the cylinder block, the adjacent ends of the pneumatic piston rod and the hydraulic piston rod abut against each other. When the gas spring is compressed to the limit, the pneumatic piston rod and the hydraulic piston rod abut against each other, and there is no need to provide a limiting structure on the cylinder block to block the pneumatic piston rod and the hydraulic piston rod, and the cylinder block does not need to bear additional pressure.

[0012] The beneficial effects of a two-way hydraulic damping gas spring of the present utility model are as follows: A pneumatic piston rod and a hydraulic piston rod are provided. The pneumatic piston rod drives the first piston part to move in the gas chamber, and the hydraulic piston rod drives the second piston part to move in the oil chamber, realizing the composite damping effect of gas resistance and liquid resistance, and providing a more stable and controllable buffering performance; A partition part is provided to clearly separate the gas chamber and the oil chamber, ensuring that during the operation of the gas spring, the gas and the hydraulic oil do not interfere with each other, improving the overall stability and reliability. The sealing ring design at both ends of the oil chamber effectively prevents the leakage of the hydraulic oil, maintains the sealing of the hydraulic system, and extends the service life of the gas spring; It has a secondary buffering function. When the gas spring is compressed, the force required to push the pneumatic piston rod into the cylinder block is greater than the force required to push the hydraulic piston rod into the cylinder block. The pneumatic piston rod is first pushed, and drives the first piston part to move in the gas chamber. The air pressure on the side of the first piston part close to the oil chamber increases, which can slow down the speed of the pneumatic piston rod being pushed in and play a buffering role. When the force required to continue pushing the pneumatic piston rod into the cylinder block is greater than the force required to push the hydraulic piston rod into the cylinder block, the hydraulic piston rod begins to be pushed into the cylinder block, and the second piston part in the oil chamber moves towards the side close to the gas chamber, resulting in an increase in the pressure on the side of the oil chamber close to the gas chamber, which can slow down the speed of the hydraulic piston rod being pushed in and continue to play a buffering role, realizing the secondary buffering in the extreme state and effectively absorbing the additional impact energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional view of a two-way hydraulic damping gas spring of the present utility model in a stretched state;

[0014] Figure 2 is a cross-sectional view of a two-way hydraulic damping gas spring of the present utility model in a compressed state;

[0015] Wherein, 1 - cylinder block, 11 - gas chamber, 12 - oil chamber, 121 - sealing ring, 13 - partition part, 2 - pneumatic piston rod, 21 - first piston part, 3 - hydraulic piston rod, 31 - first rod body, 311 - second piston part, 32 - second rod body, 321 - third piston part, 4 - connecting part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0017] As Figure 1 shown, the present utility model is a two-way hydraulic damping gas spring, which includes a cylinder body 1, a pneumatic piston rod 2 and a hydraulic piston rod 3. A partition portion 13 is provided inside the cylinder body 1. The partition portion 13 divides the internal space of the cylinder body 1 into a gas chamber 11 and an oil chamber 12. The gas chamber 11 is filled with nitrogen, and the oil chamber 12 is filled with hydraulic oil;

[0018] The pneumatic piston rod 2 extends into the cylinder body 1 from one end of the cylinder body 1 close to the gas chamber 11. A first piston portion 21 is provided at one end of the pneumatic piston rod 2 extending into the cylinder body 1. The first piston portion 21 is located in the gas chamber 11. The pneumatic piston rod 2 can drive the first piston portion 21 to move in the gas chamber 11;

[0019] The hydraulic piston rod 3 includes a first rod body 31. The first rod body 31 extends into the cylinder body 1 from one end of the cylinder body 1 close to the oil chamber 12. A second piston portion 311 is provided at the end of the first rod body 31 extending into the cylinder body 1. The first rod body 31 can drive the second piston portion 311 to move in the oil chamber 12. The hydraulic oil in the oil chamber 12 flows from one side of the second piston portion 311 to the other side at a certain rate; Both the pneumatic piston rod 2 and the first rod body 31 are connected with a connecting portion 4 at the end far from the cylinder body 1. The gas spring is connected with two relatively movable components through the connecting portion 4 to play a role of support and buffering. When the gas spring is compressed, the force required to push the pneumatic piston rod 2 into the cylinder body 1 is greater than the force required to push the hydraulic piston rod 3 into the cylinder body 1. The pneumatic piston rod 2 is first pushed, and drives the first piston portion 21 to move in the gas chamber 11. The air pressure on the side of the first piston portion 21 close to the oil chamber 12 increases, which can slow down the speed of pushing the pneumatic piston rod 2 and play a buffering role; When the force required to continue pushing the pneumatic piston rod 2 into the cylinder body 1 is greater than the force required to push the hydraulic piston rod 3 into the cylinder body 1, the hydraulic piston rod 3 begins to be pushed into the cylinder body 1. The second piston portion 311 in the oil chamber 12 moves towards the side close to the gas chamber 11. Due to the damping characteristic of the liquid, the movement speed of the second piston portion 311 can be slowed down, which can play a role of buffering and smooth movement, slow down the speed of pushing the hydraulic piston rod 3, and continue to play a buffering role.

[0020] Further, the hydraulic piston rod 3 further includes a second rod body 32. The second rod body 32 passes through the partition portion 13. Both ends of the second rod body 32 are respectively located in the air chamber 11 and the oil chamber 12. A third piston portion 321 is provided at one end of the second rod body 32 located in the air chamber 11. One end of the second rod body 32 located in the oil chamber 12 is connected to the end of the first rod body 31. When the gas spring is compressed by an external force, both the pneumatic piston rod 2 and the hydraulic piston rod 3 extend into the cylinder body 1. At this time, the volume between the first piston portion 21 and the third piston portion 321 becomes smaller and the air pressure increases. When the external force applied to the gas spring is removed, both the pneumatic piston rod 2 and the hydraulic piston rod 3 are pushed outwards, and a secondary buffering effect can still be achieved during the next compression.

[0021] Further, sealing rings 121 are provided at both ends of the oil chamber 12. The sealing rings 121 are used to prevent hydraulic oil leakage.

[0022] Further, a stud is provided at one end of the first rod body 31 close to the second rod body 32. A threaded hole is provided at one end of the second rod body 32 close to the first rod body 31. The stud is screwed into the threaded hole, and the first rod body 31 and the second rod body 32 are connected by the cooperation of the stud and the threaded hole.

[0023] Further, both the pneumatic piston rod 2 and the hydraulic piston rod 3 can completely extend into the cylinder body 1.

[0024] Further, when the pneumatic piston rod 2 and the hydraulic piston rod 3 completely extend into the cylinder body 1, the adjacent ends of the pneumatic piston rod 2 and the hydraulic piston rod 3 are in contact with each other. When the gas spring is compressed to the limit, the pneumatic piston rod 2 and the hydraulic piston rod 3 are in contact with each other. There is no need to provide a limiting structure on the cylinder body 1 to block the pneumatic piston rod 2 and the hydraulic piston rod 3. The cylinder body 1 does not need to bear additional pressure. Generally, a stroke is reserved to avoid the collision between the pneumatic piston rod 2 and the hydraulic piston rod 3.

[0025] The beneficial effects of a two-way hydraulic damping gas spring of the present utility model are as follows: An air pressure piston rod and a hydraulic piston rod are provided. The air pressure piston rod drives the first piston part to move in the air chamber, and the hydraulic piston rod drives the second piston part to move in the oil chamber, achieving a composite damping effect of air resistance and liquid resistance, and providing a more stable and controllable buffering performance; A partition part is provided to clearly separate the air chamber and the oil chamber, ensuring that during the operation of the gas spring, the gas and the hydraulic oil do not interfere with each other, improving the overall stability and reliability. The sealing ring design at both ends of the oil chamber effectively prevents the leakage of the hydraulic oil, maintains the sealing of the hydraulic system, and extends the service life of the gas spring; It has a secondary buffering effect. When the gas spring is compressed, the force required to push the air pressure piston rod into the cylinder body is greater than the force required to push the hydraulic piston rod into the cylinder body. The air pressure piston rod is first pushed, and drives the first piston part to move in the air chamber. The air pressure on the side of the first piston part close to the oil chamber increases, which can slow down the speed of the air pressure piston rod being pushed in and play a buffering role. When the force required to continue pushing the air pressure piston rod into the cylinder body is greater than the force required to push the hydraulic piston rod into the cylinder body, the hydraulic piston rod begins to be pushed into the cylinder body, and the second piston part in the oil chamber moves towards the side close to the air chamber, resulting in an increase in the pressure on the side of the oil chamber close to the air chamber, which can slow down the speed of the hydraulic piston rod being pushed in and continue to play a buffering role, achieving secondary buffering in the limit state and effectively absorbing additional impact energy.

[0026] The above describes the present utility model and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the creation of the present utility model, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present utility model.

Claims

1. A bidirectional hydraulic damping gas spring, characterized in that: The invention comprises a cylinder body (1), a pneumatic piston rod (2) and a hydraulic piston rod (3); a partition (13) is provided in the cylinder body (1); the partition (13) divides the internal space of the cylinder body (1) into an air chamber (11) and an oil chamber (12); the air chamber (11) is filled with nitrogen, and the oil chamber (12) is filled with hydraulic oil; The pneumatic piston rod (2) extends into the cylinder body (1) from one end of the cylinder body (1) close to the air cavity (11); a first piston part (21) is provided at the end of the pneumatic piston rod (2) extending into the cylinder body (1); the first piston part (21) is located in the air cavity (11); the pneumatic piston rod (2) can drive the first piston part (21) to move in the air cavity (11); The hydraulic piston rod (3) comprises a first rod body (31), the first rod body (31) extending into the cylinder body (1) from one end of the cylinder body (1) close to the oil chamber (12), a second piston part (311) being provided at the end of the first rod body (31) extending into the cylinder body (1), and the first rod body (31) can drive the second piston part (311) to move in the oil chamber (12); the ends of the pneumatic piston rod (2) and the first rod body (31) away from the cylinder body (1) are both connected to a connecting part (4), and the gas spring is connected to two relatively movable parts via the connecting part (4).

2. A bidirectional hydraulic damping gas spring according to claim 1, characterized in that: The hydraulic piston rod (3) further comprises a second rod body (32), the second rod body (32) passing through the partition (13), the two ends of the second rod body (32) being respectively located in the air cavity (11) and the oil cavity (12), the end of the second rod body (32) located in the air cavity (11) being provided with a third piston part (321), and the end of the second rod body (32) located in the oil cavity (12) being connected to the end of the first rod body (31).

3. A bidirectional hydraulic damping gas spring according to claim 2, characterized in that: Both ends of the oil chamber (12) are provided with sealing rings (121), and the sealing rings (121) are used to prevent leakage of hydraulic oil.

4. A bidirectional hydraulic damping gas spring according to claim 2, characterized in that: A stud is provided at one end of the first rod body (31) close to the second rod body (32), and a threaded hole is provided at one end of the second rod body (32) close to the first rod body (31). The stud is screwed into the threaded hole, and the first rod body (31) and the second rod body (32) are connected by the cooperation between the stud and the threaded hole.

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