Self-compensating pressure propeller dampened oil and gas bumper

Abstract

The application discloses a self-supplemental pressure propeller damping oil-gas buffer and relates to the field of buffering and damping, which comprises a cylinder, a piston is slidably connected in the cylinder, the piston is internally hollow and filled with hydraulic oil, a propeller damper is arranged in the piston, a cavity above the piston in the cylinder is a gas chamber, gas is reserved in the gas chamber, and an air charging device is further arranged in the cylinder; the damping mechanism in the application adopts a propeller screw mode, the hydraulic oil is arranged in the completely sealed piston, buffering and energy absorption are realized by using the screw damping structure, the larger damping stroke can be realized in the limited space, the hydraulic oil does not participate in sliding, the situation that dust enters the hydraulic oil and oil leakage can be avoided, the air charging device is additionally arranged, the air charging device utilizes the characteristic that the piston reciprocates under impact to charge the gas chamber with air, the excess gas is discharged from a pressure relief valve, an air spring is formed, and the efficiency of buffering and shock absorption is further improved.

Description

Technical Field

[0001] This invention relates to the field of buffering and shock absorption, specifically to a self-compensating 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 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 self-compensating propeller damping oil-gas buffer to solve the problems mentioned in the background art.

[0006] A self-compensating propeller damping hydraulic shock absorber includes a cylinder, a piston slidably connected inside the cylinder, and a cylinder end cap threadedly connected to the top opening of the piston. 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. The cavity inside the cylinder and above the piston is an air chamber containing gas. A connecting part is provided at the bottom of the piston, and a telescopic sleeve is provided between the connecting part and the cylinder. An air filling device is also provided inside the cylinder. The air filling device uses the reciprocating motion of the piston to fill the air chamber with air. The propeller damper absorbs energy by rotating its own propeller in the hydraulic oil.

[0007] Preferably, the propeller damper includes a helical guide rod, the upper and lower ends of which are respectively embedded and fixed at 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] When the ball screw sleeve rotates upward along the spiral guide rod, the inner and outer rings of the one-way bearing are locked, and the ball screw sleeve drives the paddle to rotate.

[0009] 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.

[0010] The propeller has multiple blades equidistantly arranged in the circumferential direction, and each blade has multiple oil holes.

[0011] Preferably, the inflation device includes an inflation cylinder and an inflation rod. The inflation rod is slidably and sealed inside the inflation cylinder. The cap has an oil injection hole. The inflation rod is threadedly connected to the oil injection hole. The inflation rod has an air passage inside, which connects the inside of the inflation cylinder to the air chamber. The top of the inflation rod has an inflation check valve connected to the air passage. The cylinder end cap has a gas inlet that connects to the inside of the inflation cylinder. The gas inlet is connected to a central nitrogen tank. The inflation cylinder has a suction check valve inside.

[0012] Preferably, the telescopic sleeve, the connecting part, and the cylinder are all fixed together by a clamp.

[0013] Preferably, the outer wall of the air chamber is provided with a vent, and the vent is connected to a vent valve.

[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] The advantages of this invention are as follows: The damping mechanism in this invention adopts a paddle-type helical method and the hydraulic oil is located inside a completely sealed piston. The helical damping structure is used to achieve buffering and energy absorption. Not only can a large damping stroke be achieved in a limited space, but the hydraulic oil does not participate in sliding, which can avoid the entry of dust into the hydraulic oil and the leakage of oil. An air charging device is added, which uses the characteristic that the piston will reciprocate when impacted to charge the air chamber and remove excess gas from the pressure relief valve to form an air spring, further reducing the impact and obtaining high-efficiency buffering and shock absorption. Attached Figure Description

[0017] Figure 1 This is a general sectional view of the present invention;

[0018] Figure 2 This is a schematic diagram of the propeller damper of the present invention;

[0019] Figure 3 This is the present invention. Figure 1A partial sectional view at point A in the middle.

[0020] Figure 4 This is a schematic diagram of the application state of the present invention.

[0021] In the diagram: 1. Cylinder; 11. Air chamber; 12. Air inlet; 13. Air vent;

[0022] 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;

[0023] 22. Sealing cap; 23. Spring 1; 24. Connecting part; 25. Sealing ring; 26. Sealing ring;

[0024] 3. Cylinder end cap; 31. Buffer connection end; 4. Telescopic sleeve;

[0025] 5. Inflation device; 51. Inflation cylinder; 52. Inflation rod; 521. Air passage; 53. Inflation check valve; 54. Suction check valve; 6. Hoop; 7. 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 self-compensating propeller damping hydraulic shock absorber includes a cylinder 1, a piston 2 slidably connected inside the cylinder 1, and a cylinder end cap 3 threadedly connected to the top opening of the piston 2. The piston 2 is hollow 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. The cavity inside the cylinder 1 and above the piston 2 is an air chamber 11, which contains gas. A connecting part 24 is provided at the bottom of the piston 2. A telescopic sleeve 4 is provided between the connecting part 24 and the cylinder 1. An air filling device 5 is also provided inside the cylinder 1. The air filling device 5 uses the reciprocating motion of the piston 2 to fill the air chamber 11 with air. The propeller damper 21 absorbs energy by rotating its own propeller 214 in the hydraulic oil.

[0028] In this embodiment, the propeller damper 21 includes a helical guide rod 211. The upper and lower ends of the helical guide rod 211 are respectively embedded and fixed at 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. The outer side of the ball sleeve 212 is connected to a propeller 214 through a one-way bearing 213. The upper and lower ends of the ball sleeve 212 are each connected to a spring end support 215 through an end support bearing 216. A spring 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.

[0029] 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.

[0030] 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.

[0031] The propeller 214 has multiple blades equidistantly arranged in the circumferential direction, and the blades have multiple oil holes.

[0032] In this embodiment, the inflation device 5 includes an inflation cylinder 51 and an inflation rod 52. The inflation rod 52 is slidably connected to the inflation cylinder 51. The cap 22 is provided with an oil injection hole. The inflation rod 52 is threadedly connected to the oil injection hole. The inflation rod 52 is provided with an air passage 521. The air passage 521 connects the inside of the inflation cylinder 51 with the air chamber 11. The top of the inflation rod 52 is provided with an inflation one-way valve 53 connected to the air passage 521. The cylinder end cap 3 is provided with an air inlet 12 that communicates with the inside of the inflation cylinder 51. The air inlet 12 is connected to the central nitrogen tank. The inflation cylinder 51 is provided with an intake one-way valve 54.

[0033] In this embodiment, the telescopic sleeve 4, the connecting part 24, and the cylinder 1 are all fixed together by the sleeve 6.

[0034] In this embodiment, the outer wall of the air chamber 11 is provided with a vent 13, and the vent 13 is connected to a vent valve.

[0035] In this embodiment, a buffer connection end 31 is fixedly connected to the cylinder end cap 3, and a spring 7 is embedded in the top of the sealing cap 22.

[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] Working process and its principle:

[0038] 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.

[0039] 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.

[0040] 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. At this time, the inner and outer rings of the one-way bearing 213 are in the unlocked state. Therefore, the propeller 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.

[0041] 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.

[0042] When the impact ends, piston 2 resets under the pressure of air in air chamber 11 and the action of spring 7. 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. At this time, the inner and outer rings of one-way bearing 213 are locked. Therefore, 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.

[0043] 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 7 is added. When the second spring 7 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.

[0044] During the above process, the reciprocating motion of piston 2 drives the inflation rod 52 to reciprocate within the inflation cylinder 51. When the inflation rod 52 leaves the interior of the inflation rod 52, the intake check valve 54 opens and the inflation check valve 53 closes, allowing nitrogen from the central nitrogen tank to enter the inflation cylinder 51 through the air inlet 12 and the intake check valve 54. When the inflation rod 52 extends into the interior of the inflation rod 52, the intake check valve 54 closes and the inflation check valve 53 opens, allowing nitrogen from the inflation cylinder 51 to enter the air chamber 11 through the air passage 521 to form a gas spring, reducing impact energy. The overpressure generated by self-compensating inflation can be released through the central pressure relief valve pre-set by the vehicle's suspension air pressure control system to maintain stable air pressure in the upper air chamber of piston 2. Simultaneously, the above intake and exhaust processes can also absorb some impact energy.

[0045] 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 self-compensating pressure propeller damping oil-gas buffer, characterized in that, The cylinder (1) includes a piston (2) which is slidably connected inside the cylinder (1) and a cylinder end cap (3) is threadedly connected to the top opening of the piston (2). The piston (2) is hollow and filled with hydraulic oil. The piston (2) has a propeller damper (21) in its inner cavity and a sealing cap (22) is threadedly connected to the top opening of the piston (2). The cavity inside the cylinder (1) and above the piston (2) is a gas chamber (11). The gas chamber (11) contains gas. The bottom of the piston (2) has a connecting part (24). A telescopic sleeve (4) is provided between the connecting part (24) and the cylinder (1). The cylinder (1) also has an air filling device (5). The air filling device (5) uses the reciprocating motion of the piston (2) to fill the gas chamber (11) with air. The propeller damper (21) absorbs energy by rotating its own propeller (214) in the hydraulic oil. The propeller damper (21) includes a helical guide rod (211). The upper and lower ends of the helical guide rod (211) are respectively embedded and fixed at 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). 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 self-compensating propeller damping oil-gas buffer according to claim 1, characterized in that, The inflation device (5) includes an inflation cylinder (51) and an inflation rod (52). The inflation rod (52) is slidably connected to the inflation cylinder (51). The sealing cap (22) is provided with an oil injection hole. The inflation rod (52) is threadedly connected to the oil injection hole. The inflation rod (52) is provided with an air passage (521). The air passage (521) connects the inside of the inflation cylinder (51) with the air chamber (11). The top of the inflation rod (52) is provided with an inflation check valve (53) connected to the air passage (521). The cylinder end cap (3) is provided with an air inlet (12) connected to the inside of the inflation cylinder (51). The air inlet (12) is connected to the central nitrogen tank. The inflation cylinder (51) is provided with an air intake check valve (54).

3. The self-compensating propeller damping oil-gas buffer according to claim 1, characterized in that, The telescopic sleeve (4), the connecting part (24), and the cylinder (1) are all fixed together by a sleeve clamp (6).

4. The self-compensating propeller damping oil-gas buffer according to claim 1, characterized in that, The outer wall of the air chamber (11) is provided with an air vent (13), which is connected to an air vent valve.

5. The self-compensating 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 (7) is embedded in the top of the sealing cap (22).

6. The self-compensating 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 provided on the outer wall of the piston (2).

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