A closed cylinder propeller damper oil and gas buffer

Abstract

This invention discloses a closed-cylinder propeller-damped hydraulic shock absorber, relating to the field of buffering and vibration reduction. It includes a piston slidably connected inside a cylinder, with a cylinder end cap threadedly connected to its top opening. The piston is hollow and filled with hydraulic oil. A propeller damper is installed inside the piston cavity, with a sealing cap threadedly connected to its top opening. The cavity inside the cylinder and above the piston is a gas chamber containing gas. The propeller-like helical structure of this invention achieves damping and energy dissipation, and the hydraulic oil is located inside a completely sealed piston. This not only achieves a higher energy dissipation effect through increased helical damping stroke, but also prevents dust from entering the hydraulic oil and oil leakage by ensuring the hydraulic oil does not participate in sliding. The gas chamber is equipped with an air inlet, which is connected to both a vent valve and a nitrogen tank through a pneumatic pressure control system, allowing for air replenishment, pressure maintenance, and subsequent maintenance of the gas chamber.

Description

Technical Field

[0001] This invention relates to the field of buffering and shock absorption, specifically to a closed-cylinder propeller damping oil-gas buffer. Background Technology

[0002] Hydraulic dampers are typically placed between the axle and frame of a vehicle to reduce the impact of road undulations and sudden load changes on the vehicle body and occupants. Existing hydraulic dampers use a baffle with damping holes to divide the cylinder into an oil chamber and an air chamber. The damping chamber absorbs energy by pressurizing hydraulic oil into the air chamber, utilizing air pressure changes and fluid resistance.

[0003] Existing hydraulic dampers use linear motion damping pistons, which limits the design of the damping stroke. Moreover, the oil chamber of the hydraulic damper is not a closed structure. During long-term operation, the repeated friction between the piston and the cylinder can easily cause wear and lead to hydraulic oil leakage. Therefore, it is often necessary to replenish liquid and gas working substances, and even add additional hydraulic pressure detection and replenishment auxiliary systems. This inevitably leads to the complexity of the hydraulic damping system structure, increased manufacturing and maintenance costs, and reduced reliability.

[0004] The limited linear damping stroke restricts the damping energy dissipation effect. In addition, dust entering the hydraulic oil can clog the damping orifice, affecting the normal use of the oil-air buffer. Summary of the Invention

[0005] The purpose of this invention is to provide a closed-cylinder propeller damping oil-gas buffer to solve the problems mentioned in the background art.

[0006] A closed-cylinder type propeller damping oil-gas buffer includes a cylinder, a piston is slidably connected inside the cylinder and a cylinder end cap is threadedly connected to the top opening of the cylinder, the piston is hollow and filled with hydraulic oil, a propeller damper is provided in the inner cavity of the piston and a sealing cap is threadedly connected to the top opening of the piston.

[0007] The propeller damper includes a helical guide rod, the upper and lower ends of which are respectively embedded in the center of the cap and the center of the bottom of the piston's inner cavity. A ball sleeve is threaded onto the helical guide rod, and a propeller is connected to the outer side of the ball sleeve via a one-way bearing. A spring end support is connected to the upper and lower ends of the ball sleeve via end support bearings. A spring is provided between the upper spring end support and the cap, and between the lower spring end support and the inner bottom of the piston.

[0008] The cavity inside the cylinder and above the piston is a gas chamber, which contains gas.

[0009] Preferably, when the ball sleeve rotates upward along the helical guide rod, the inner and outer rings of the one-way bearing are locked, and the ball sleeve drives the propeller to rotate.

[0010] When the ball screw sleeve rotates downward along the spiral guide rod, the inner and outer rings of the one-way bearing can rotate freely, and the ball screw sleeve does not drive the propeller to rotate.

[0011] The propeller has multiple blades equidistantly arranged in the circumferential direction, and each blade has multiple oil holes.

[0012] Preferably, the piston has a connecting part at the bottom, and a telescopic sleeve is provided between the connecting part and the cylinder. The telescopic sleeve, the connecting part, and the cylinder are all fixed together by a clamp.

[0013] Preferably, the outer wall of the gas chamber is provided with a gas inlet, which is connected to both a vent valve and a nitrogen tank through a gas pressure control system, and the gas is nitrogen.

[0014] Preferably, a buffer connection end is fixedly connected to the cylinder end cap, and a spring is embedded in the top of the cap.

[0015] Preferably, a sealing ring is provided between the cap and the piston, and a sealing ring is fitted on the outer wall of the piston.

[0016] Preferably, the cap is threaded with a plug, and the upper end of the spiral guide rod is connected to a screw.

[0017] The advantages of this invention are:

[0018] The paddle-type helical structure in this invention achieves damping energy dissipation, and the hydraulic oil is located inside a completely sealed piston. This not only achieves a higher energy dissipation effect by increasing the helical damping stroke, but also prevents dust from entering the hydraulic oil and oil leakage by ensuring that the hydraulic oil does not participate in sliding. The air chamber is equipped with an air supply port, which is connected to the air release valve and nitrogen tank through the air pressure control system. This allows for air supply to the air chamber, maintenance of air pressure, and subsequent maintenance. Attached Figure Description

[0019] Figure 1 This is a general sectional view of the present invention;

[0020] Figure 2 This is a schematic diagram of the propeller damper.

[0021] Figure 3 Figure 1 A partial sectional view at point A in the middle;

[0022] Figure 4 This is a schematic diagram of the application state of the present invention.

[0023] In the diagram: 1. Cylinder; 11. Air chamber; 12. Air inlet;

[0024] 2. Piston; 21. Propeller damper; 211. Helical guide rod; 212. Ball sleeve; 213. One-way bearing; 214. Paddle wheel; 215. Spring end support; 216. End support bearing; 22. Sealing cap; 221. Plug; 23. Spring 1; 24. Connecting part; 25. Sealing ring; 26. Sealing ring;

[0025] 3. Cylinder end cap; 31. Buffer connection end; 4. Telescopic sleeve; 5. Hoop; 6. Spring 2. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0027] like Figures 1 to 4 As shown, a closed-cylinder type propeller damping oil-gas buffer includes a cylinder 1, a piston 2 is slidably connected inside the cylinder 1 and a cylinder end cap 3 is threadedly connected to the top opening of the piston 1, the piston 2 is hollow inside and filled with hydraulic oil, a propeller damper 21 is provided in the inner cavity of the piston 2 and a sealing cap 22 is threadedly connected to the top opening of the piston 2.

[0028] The propeller damper 21 includes a helical guide rod 211, with its upper and lower ends embedded in the center of the cap 22 and the center of the bottom of the piston 2's inner cavity, respectively. A ball sleeve 212 is threaded onto the helical guide rod 211. A propeller 214 is connected to the outer side of the ball sleeve 212 via a one-way bearing 213. A spring end support 215 is connected to the upper and lower ends of the ball sleeve 212 via end support bearings 216. A spring-1 23 is provided between the upper spring end support 215 and the cap 22, and between the lower spring end support 215 and the inner bottom of the piston 2. The spring end support 215 and the spring-1 23 work together to ensure that the ball sleeve 212 is in the center position when not under impact.

[0029] The cavity inside the cylinder 1 and above the piston 2 is a gas chamber 11, which contains gas.

[0030] In this embodiment, when the ball screw sleeve 212 rotates upward along the spiral guide rod 211, the inner and outer rings of the one-way bearing 213 are locked, and the ball screw sleeve 212 drives the propeller 214 to rotate.

[0031] When the ball screw sleeve 212 rotates downward along the spiral guide rod 211, the inner and outer rings of the one-way bearing 213 can rotate freely, and the ball screw sleeve 212 does not drive the propeller 214 to rotate.

[0032] The propeller 214 has multiple blades equidistantly arranged in the circumferential direction, and the blades have multiple oil holes.

[0033] In this embodiment, the piston 2 has a connecting part 24 at its bottom, and a telescopic sleeve 4 is provided between the connecting part 24 and the cylinder 1. The telescopic sleeve 4, the connecting part 24, and the cylinder 1 are all fixed together by a clamp 5. The telescopic sleeve 4 is used to protect the piston 2 from contact with the outside world.

[0034] In this embodiment, a gas supply port 12 is provided on the outer wall of the gas chamber 11. The gas supply port 12 is connected to both a vent valve and a nitrogen tank via a gas pressure control system, and the gas is nitrogen. The gas pressure control system is used to control the nitrogen tank and the corresponding solenoid valve to supply gas to the gas supply port 12.

[0035] In this embodiment, a buffer connection end 31 is fixedly connected to the cylinder end cap 3, and a spring 6 is embedded in the top of the sealing cap 22. The spring 6 is used to limit the minimum distance between the piston 2 and the cylinder 1 to maintain safe support between the frame and the axle.

[0036] In this embodiment, a sealing ring 25 is provided between the cap 22 and the piston 2, and a sealing ring 26 is fitted on the outer wall of the piston 2.

[0037] In this embodiment, the cap 22 is threaded with a screw plug 221, and the upper end of the spiral guide rod 211 is connected to a screw.

[0038] Working process and its principle:

[0039] The inner cavity of piston 2 is pre-filled with hydraulic oil. Spring 23 causes propeller damper 21 to be suspended in the middle of the cavity. Connecting part 24 and buffer connecting end 31 are connected to axle and frame respectively, so that the vehicle body and frame are suspended on axle by buffer.

[0040] When the vehicle encounters a bump in the ground or an impact on the vehicle body while driving, piston 2 moves upward, and air chamber 11 is continuously compressed, increasing air pressure and resistance, thus reducing some of the impact energy.

[0041] During this process, the ball sleeve 212 attempts to maintain its original position in the vertical direction due to inertia. Therefore, the ball sleeve 212 moves downward and rotates relative to the upward-moving piston 2 along the spiral guide rod 211. Since the one-way bearing 213 is in the unlocked state at this time, the paddle 214 will not rotate with the one-way bearing 213. During this process, the friction between the ball sleeve 212 and its accessories and the hydraulic oil in the piston 2 cavity, as well as the internal friction of the fluid, generated by the downward movement of the ball sleeve 212 and its accessories relative to the hydraulic oil in the piston 2 cavity, is converted into heat energy, which can also offset some of the impact energy.

[0042] In order for the piston 2 to rise and retract quickly when encountering a ground protrusion, so as to reduce the impact on the vehicle body, it is desirable for the ball screw sleeve 212 to descend quickly along the helical guide rod 211 under the influence of inertia. Therefore, the helix angle of both should be designed to be relatively large.

[0043] When the impact ends, piston 2 resets under the pressure of air in air chamber 11 and the action of spring 23. At this time, ball sleeve 212, due to inertia, still attempts to maintain its original position in the vertical direction. Therefore, ball sleeve 212 moves upward relative to helical guide rod 211 and rotates in the opposite direction under the action of the thread. Since one-way bearing 213 is locked at this time, propeller 214 rotates in the same direction as ball sleeve 212. The blades of propeller 214 agitate the hydraulic oil and consume the impact energy. Because the helical stroke formed by this helical mechanism is large, the fluid damping absorption effect on impact energy is also better during the reset process of ball sleeve 212.

[0044] When the pressure in the air chamber 11 is completely lost due to some malfunction, the weight of the frame and body causes the cylinder 1 to sink, which reduces the distance between the piston 2 and the cylinder 1. Therefore, a second spring 6 is added. When the second spring 6 is compressed, it can limit the minimum distance between the piston 2 and the cylinder 1 to maintain the safe support between the frame and the axle.

[0045] Nitrogen can be supplied to the gas chamber 11 via the gas supply port 12. The pressure relief valve is used to maintain the gas pressure in the gas chamber 11 below the safe pressure. When gas supply is not required, the pipeline connected to the pressure relief valve and the gas supply port 12 is disconnected by a solenoid valve to prevent gas from leaking from the pressure relief valve during normal use of the buffer.

[0046] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative and not exhaustive. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A closed-cylinder type propeller damping oil-gas buffer, characterized in that, Includes a cylinder (1), inside which a piston (2) is slidably connected and a cylinder end cap (3) is threadedly connected to the top opening of the cylinder (1). The piston (2) is hollow and filled with hydraulic oil. The closed-cylinder propeller refers to the piston (2) having a propeller damper (21) in its inner cavity. A sealing cap (22) is threadedly connected to the top opening of the piston (2). The propeller damper (21) includes a helical guide rod (211), the upper and lower ends of which are respectively embedded in the center of the cap (22) and the center of the bottom of the inner cavity of the piston (2). A ball sleeve (212) is threaded onto the helical guide rod (211). A propeller (214) is connected to the outer side of the ball sleeve (212) through a one-way bearing (213). A spring end support (215) is connected to the upper and lower ends of the ball sleeve (212) through an end support bearing (216). A spring 1 (23) is provided between the upper spring end support (215) and the cap (22) and between the lower spring end support (215) and the inner bottom of the piston (2). The cavity inside the cylinder (1) and above the piston (2) is a gas chamber (11), and gas is stored in the gas chamber (11). When the ball screw sleeve (212) rotates upward along the spiral guide rod (211), the inner and outer rings of the one-way bearing (213) are locked, and the ball screw sleeve (212) drives the propeller (214) to rotate. When the ball screw sleeve (212) rotates downward along the spiral guide rod (211), the inner and outer rings of the one-way bearing (213) can rotate freely, and the ball screw sleeve (212) does not drive the propeller (214) to rotate. The propeller (214) has multiple blades equidistantly arranged in the circumferential direction, and the blades have multiple oil holes.

2. The closed-cylinder type propeller damping oil-gas buffer according to claim 1, characterized in that, The piston (2) has a connecting part (24) at its bottom. A telescopic sleeve (4) is provided between the connecting part (24) and the cylinder (1). The telescopic sleeve (4), the connecting part (24), and the cylinder (1) are all fixed together by a sleeve clamp (5).

3. The closed-cylinder type propeller damping oil-gas buffer according to claim 1, characterized in that, The outer wall of the gas chamber (11) is provided with a gas supply port (12), which is connected to both a vent valve and a nitrogen tank through a gas pressure control system. The gas is nitrogen.

4. The closed-cylinder type propeller damping oil-gas buffer according to claim 1, characterized in that, A buffer connection end (31) is fixedly connected to the cylinder end cap (3), and a spring (6) is embedded in the top of the sealing cap (22).

5. A closed-cylinder type propeller damping oil-gas buffer according to claim 1, characterized in that, A sealing ring (25) is provided between the cap (22) and the piston (2), and a sealing ring (26) is fitted on the outer wall of the piston (2).

6. A closed-cylinder type propeller damping oil-gas buffer according to claim 1, characterized in that, The cap (22) is threaded with a screw plug (221), and the upper end of the spiral guide rod (211) is connected to a screw.

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