A new bidirectional damper

Abstract

This utility model discloses a novel bidirectional damper, including a damping tube and two piston rods on both sides. An mounting plate is provided at the inner end of each piston rod, and a spring is installed inside the damping tube. Both ends of the spring are fixedly connected to the mounting plates on both sides. This novel bidirectional damper innovatively adopts an integrated structural design where the spring connects the two piston rods on both sides, completely abandoning the traditional approach of cylinder separation. Through the coordinated cooperation of the spring inside the damping tube, the mounting plates on both sides, and the piston head, the piston rods on both sides can achieve smooth extension and retraction throughout their full stroke inside the damping tube, no longer limited by the constraints of half the cylinder space. This significantly expands the effective stroke of the damper, allowing the rod extension distance to fully adapt to the overall length of the damping tube, fully meeting the needs of scenarios such as large-amplitude movement buffering during engineering machinery operation and long-stroke shock absorption during vehicle driving.

Description

Technical Field

[0001] This utility model relates to the field of damper technology, specifically a novel bidirectional damper. Background Technology

[0002] Hydraulic dampers are common mechanical devices primarily used for controlling movement speed and reducing vibration. Their structure typically consists of components such as a cylinder, piston, valve, seals, and connecting joints. Their working principle is based on the resistance to fluid flow. When the device is displaced, the fluid is compressed within narrow gaps, channels, or the cylinder, generating shear or compressive forces that convert kinetic energy into heat energy, thereby slowing down the movement and achieving vibration reduction and damping effects. Hydraulic dampers are speed-sensitive vibration control devices widely used in engineering machinery, the automotive industry, aerospace, nuclear power, and thermal power plants.

[0003] The existing Chinese patent publication number CN209621932U, entitled "A Bidirectional Hydraulic Damper," explicitly states in its abstract that "This utility model provides a bidirectional hydraulic damper. The bidirectional hydraulic damper includes: a hydraulic cylinder; a first hydraulic device, the first hydraulic device being disposed on the left side of the inner wall of the hydraulic cylinder, and the first hydraulic device including a first hydraulic sleeve, with a first movable frame and a second movable frame slidably connected to the top and bottom of the inner wall of the first hydraulic sleeve. The bidirectional hydraulic damper provided by this utility model has the first and second hydraulic sleeves internally supported by a first push rod and the end of a first push rod, and a second push rod and the end of a second push rod. The damper has a damping channel connecting both sides of the floating piston, which can reduce the pressure exerted on the sealing structure by the damping fluid when the floating piston moves. Therefore, a simpler sealing structure can be used to ensure the sealing effect, thereby simplifying the structure, reducing processing costs, and improving the damping effect."

[0004] However, in this technology, the damper needs to be divided into two parts inside the cylinder to ensure the extension and retraction of the rod. In this case, the rod on one side can only extend and retract half the distance inside the cylinder, which limits the effective stroke of the overall damper. It is not suitable for scenarios that require large displacement compensation and cannot meet the needs of engineering machinery, automotive industry and other fields for long stroke and wide range of damping. Utility Model Content

[0005] The purpose of this invention is to provide a novel bidirectional damper to solve the problem mentioned in the background art that the rod on one side can only extend and retract half the distance inside the cylinder.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A novel bidirectional damper includes a damping tube and piston rods on both sides; The piston rod has an inner end plate, and the damping tube has a spring inside. The two ends of the spring are fixedly connected to the two mounting plates.

[0007] In a preferred embodiment of this utility model, the damping tube is provided with limit ports at the top and bottom, and the piston rod is slidably connected to the limit ports.

[0008] In a preferred embodiment of this utility model, an oil injection hole is provided on one side of the damping tube, and the inside of the damping tube is filled with hydraulic oil.

[0009] In a preferred embodiment of this utility model, a sealing sleeve is provided at the top and bottom of the inner side of the damping tube, and the sealing sleeve is in contact with the piston rod.

[0010] In a preferred embodiment of this utility model, a piston head is provided on one side of the mounting plate, and the piston head contacts the inner wall of the damping tube.

[0011] In a preferred embodiment of this utility model, the piston head and the mounting plate are provided with oil leakage ports.

[0012] In a preferred embodiment of this utility model, a limiting plate is further provided on the inner side of the piston rod, and a blocking ring is provided on one side of the limiting plate.

[0013] In a preferred embodiment of this utility model, the blocking ring is sleeved on the outside of the piston rod and slides, and the blocking ring contacts one side of the mounting plate.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0015] Beneficial effects: This novel bidirectional damper innovatively adopts an integrated structural design with springs connecting the piston rods on both sides, completely abandoning the traditional approach of cylinder block separation. Through the coordinated cooperation of the spring inside the damping tube with the mounting plates on both sides and the piston head, the piston rods on both sides can achieve smooth extension and retraction throughout the entire stroke inside the damping tube, no longer limited by the constraints of half the space of the cylinder block. This significantly expands the effective stroke of the damper, allowing the rod extension and retraction distance to fully adapt to the overall length of the damping tube, fully meeting the needs of scenarios such as large-amplitude movement buffering during construction machinery operation and long-stroke shock absorption during vehicle driving.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the main structure of a novel bidirectional damper; Figure 2 A schematic diagram of the internal structure of the damping tube in a novel bidirectional damper; Figure 3 A schematic diagram of the cross-sectional structure of the damping tube in a novel bidirectional damper; Figure 4 This is a schematic diagram of the connection structure of the mounting plates on both sides in a novel bidirectional damper. Figure 5 This is a schematic diagram of the cross-sectional structure of the mounting plate and piston head in a novel bidirectional damper.

[0018] In the diagram: 1. Damping tube; 11. Oil injection hole; 12. Limiting port; 13. Sealing sleeve; 2. Piston rod; 21. Limiting plate; 22. Mounting plate; 23. Piston head; 3. Spring; 31. Blocking ring; 32. Oil leakage port. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] Please refer to Figures 1-5 This utility model discloses a novel bidirectional damper, comprising a damping tube 1 and two piston rods 2 on both sides. The damping tube 1 is made of high-strength seamless steel pipe with an outer diameter of 80-120mm, an inner diameter of 60-100mm, and a length of 300-500mm, preferably with an outer diameter of 100mm, an inner diameter of 80mm, and a length of 400mm. The piston rods 2 are made of No. 45 steel with a diameter of 30-50mm and a length of 200-350mm, preferably with a diameter of 40mm and a length of 300mm, ensuring sufficient load-bearing strength and deformation resistance.

[0021] A mounting plate 22 is welded to the inner end of the piston rod 2. The mounting plate 22 is made of stainless steel with a thickness of 8-12mm and a diameter that matches the inner diameter of the damping tube 1, which is 58-98mm. The optimal thickness is 10mm and the diameter is 78mm. A spring 3 is installed inside the damping tube 1. The spring 3 is made of alloy spring steel with a wire diameter of 5-8mm, an outer diameter of 50-80mm, and a free length of 150-250mm. The optimal wire diameter is 6mm, the outer diameter is 65mm, and the free length is 200mm. The two ends of the spring 3 are fixedly connected to the mounting plates 22 on both sides by welding to realize the linkage of the piston rods 2 on both sides.

[0022] The top and bottom of the damping tube 1 are integrally formed with a limiting port 12. The inner diameter of the limiting port 12 is 0.5-1mm larger than the diameter of the piston rod 2, and preferably 0.8mm larger, to ensure that the piston rod 2 and the limiting port 12 are smoothly connected and to prevent the piston rod 2 from deviating or getting stuck during the sliding process.

[0023] An oil injection hole 11 is opened on one side of the damping tube 1. The diameter of the oil injection hole 11 is set to 8-12mm, and the optimal diameter is 10mm. The hole is provided with internal threads and can be sealed by bolts. The inside of the damping tube 1 is filled with No. 46 anti-wear hydraulic oil, and the filling amount is 80%-90% of the internal volume of the damping tube 1, and the optimal amount is 85%, to ensure stable hydraulic damping effect.

[0024] The top and bottom of the inner side of the damping tube 1 are fitted with a sealing sleeve 13 by an interference fit. The sealing sleeve 13 is made of nitrile rubber with a thickness of 5-8mm, preferably 6mm. Its inner diameter is matched with the diameter of the piston rod 2. The sealing sleeve 13 is in close contact with the piston rod 2, which effectively prevents the leakage of hydraulic oil inside the damping tube 1.

[0025] A piston head 23 is fixedly connected to one side of the mounting plate 22 by bolts. The piston head 23 is made of polyurethane with a thickness of 10-15mm, preferably 12mm. Its diameter is fitted with the inner diameter of the damping tube 1 with a clearance of 0.1-0.2mm, preferably 0.15mm. The piston head 23 is in close contact with the inner wall of the damping tube 1, thereby separating the internal space of the damping tube 1 and driving the hydraulic oil.

[0026] Both the piston head 23 and the mounting plate 22 are provided with oil drain ports 32. The diameter of the oil drain ports 32 is set to 3-5mm, with 4mm being the best. The number of ports is set to 3-5, with 4 being the best. They are evenly distributed along the circumference to ensure that the hydraulic oil can pass through smoothly and form a stable damping force.

[0027] A limiting plate 21 is welded and fixed to the inner side of the piston rod 2. The limiting plate 21 is made of stainless steel with a thickness of 6-10mm, preferably 8mm. Its diameter is 5-10mm smaller than the inner diameter of the damping tube 1, preferably 8mm smaller. A blocking ring 31 is provided on one side of the limiting plate 21. The blocking ring 31 is made of polytetrafluoroethylene. Its inner diameter is 0.2-0.3mm larger than the diameter of the piston rod 2, preferably 0.25mm larger. Its outer diameter is 3-5mm smaller than the inner diameter of the damping tube 1, preferably 4mm smaller. The blocking ring 31 is sleeved on the outside of the piston rod 2 and can slide smoothly along the piston rod 2. The blocking ring 31 is in close contact with one side of the mounting plate 22, which plays a limiting and buffering role, preventing the mounting plate 22 from directly colliding with the limiting plate 21 and causing damage.

[0028] The working principle of this utility model is as follows: When the damper is subjected to external force, the piston rod 2 on one side pushes into the damping tube 1, causing the corresponding mounting plate 22 and piston head 23 to move. The piston head 23 squeezes the hydraulic oil inside the damping tube 1, and the hydraulic oil flows to the other side through the oil leakage port 32 on the piston head 23 and mounting plate 22. At the same time, the spring 3 is compressed and generates a reverse elastic force. When the external force disappears, the spring 3 returns to its original shape, pushing the mounting plates 22 and piston head 23 on both sides to reset, and causing the piston rods 2 on both sides to return to their initial positions. During this process, the hydraulic oil flows back through the oil leakage port 32 again. Through the resistance of the hydraulic oil flow and the elastic force of the spring 3, the movement speed is controlled and the shock absorption effect is achieved. The limiting port 12 restricts the sliding direction of the piston rod 2, the sealing sleeve 13 prevents hydraulic oil leakage, and the limiting plate and the blocking ring 31 prevent excessive collision of components, ensuring the stable operation of the device.

[0029] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A novel bidirectional damper, characterized in that: Includes a damping tube (1) and piston rods on both sides (2); The piston rod (2) has an inner end plate (22) and a spring (3) inside the damping tube (1). The two ends of the spring (3) are fixedly connected to the two sides of the mounting plate (22).

2. The novel bidirectional damper according to claim 1, characterized in that, The damping tube (1) is provided with limit ports (12) at the top and bottom, and the piston rod (2) is slidably connected to the limit ports (12).

3. A novel bidirectional damper according to claim 1, characterized in that, The damping tube (1) has an oil injection hole (11) on one side, and the damping tube (1) is filled with hydraulic oil.

4. A novel bidirectional damper according to claim 1, characterized in that, The damping tube (1) has a sealing sleeve (13) at the top and bottom of its inner side, and the sealing sleeve (13) is in contact with the piston rod (2).

5. A novel bidirectional damper according to claim 1, characterized in that, A piston head (23) is provided on one side of the mounting plate (22), and the piston head (23) is in contact with the inner wall of the damping tube (1).

6. A novel bidirectional damper according to claim 5, characterized in that, The piston head (23) and the mounting plate (22) are provided with oil leakage ports (32).

7. A novel bidirectional damper according to claim 1, characterized in that, The piston rod (2) is also provided with a limiting plate (21) on the inner side, and a blocking ring (31) is provided on one side of the limiting plate (21).

8. A novel bidirectional damper according to claim 7, characterized in that, The blocking ring (31) is sleeved on the outside of the piston rod (2) and slides, and the blocking ring (31) contacts one side of the mounting plate (22).

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