CN109296691B - Double-cavity buffer - Google Patents
Double-cavity buffer Download PDFInfo
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- CN109296691B CN109296691B CN201811333227.2A CN201811333227A CN109296691B CN 109296691 B CN109296691 B CN 109296691B CN 201811333227 A CN201811333227 A CN 201811333227A CN 109296691 B CN109296691 B CN 109296691B
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- inner cylinder
- oil
- cavity
- outer cylinder
- cylinder
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- 239000000872 buffer Substances 0.000 title claims abstract description 25
- 238000007667 floating Methods 0.000 claims abstract description 33
- 230000000903 blocking effect Effects 0.000 claims abstract description 12
- 230000009977 dual effect Effects 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 60
- 239000007789 gas Substances 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/062—Bi-tubular units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/12—Fluid damping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/12—Fluid damping
- F16F2222/126—Fluid damping using gases
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The application belongs to the technical field of design of aircraft landing gear buffers, and particularly relates to a double-cavity buffer. A dual chamber buffer is provided, which includes: an inner barrel; a first blanking cover; a second blanking cover; a first floating piston; a second floating piston; an outer cylinder; a blocking sleeve; the double-cavity buffer is characterized in that the inner cylinder is internally provided with a first oil cavity, a first air cavity and a second air cavity which are mutually independent, the outer cylinder is sleeved on the outer side of the inner cylinder, the second oil cavity is formed between the outer cylinder and the inner cylinder and is communicated with the first oil cavity through a throttling hole, and the outer cylinder, the first oil cavity and the second air cavity are arranged in parallel.
Description
Technical Field
The application belongs to the technical field of design of aircraft landing gear buffers, and particularly relates to a double-cavity buffer.
Background
In order to reduce the impact load on the aircraft, landing gears are designed on modern aircraft to bear and reduce the impact load. In this respect, it is desirable that the landing gear be as lightweight as possible and as small as possible, again because the landing gear is not effective during flight of the aircraft.
The key part of the landing gear for bearing and relieving the impact load is a buffer on the landing gear, and the buffer absorbs and dissipates the energy carried by the impact load through the compression of oil and gas in the buffer during the landing process of the airplane, so that the influence on the airplane is relieved.
Helicopters have higher landing performance requirements, and common single-chamber buffers are difficult to obtain ideal overload control, and at the moment, double-chamber buffers are mostly adopted. The typical double-chamber buffer is structured as shown in fig. 1, when an airplane lands, an oil chamber a is compressed, liquid oil in the oil chamber a flows through an oil hole to press a low-pressure chamber B, and gas in the low-pressure chamber B is compressed, so that energy of an impact load is absorbed; when the pressure in the low pressure cavity B is higher than the pressure in the high pressure cavity C, the gas in the high pressure cavity C is compressed, so that the energy of the impact load is further absorbed, and the influence of the impact load on the airplane during landing is reduced. The upper oil cavity, the low pressure cavity and the high pressure cavity of the double-cavity buffer are sequentially arranged along the axial direction as a whole, and the whole buffer is longer and has certain weight cost.
It would be desirable to have a solution that overcomes or at least alleviates at least one of the above-mentioned disadvantages of the prior art.
Disclosure of Invention
It is an object of the present application to provide a dual chamber bumper that addresses or alleviates at least one of the problems set forth above.
The technical scheme of the application is as follows: a dual chamber bumper, comprising:
the inner cylinder is provided with a throttling hole;
the first plugging cover is used for plugging one end of the inner barrel;
the second plugging cover is used for plugging the other end of the inner barrel;
the first floating piston is arranged in the inner cylinder, is in sealing contact with the inner cylinder and can axially move along the inner cylinder; a first air cavity is formed between the first floating piston and the first plugging cover;
the second floating piston is arranged in the inner cylinder, is in sealing contact with the inner cylinder and can axially move along the inner cylinder; a second air cavity is formed between the second floating piston and the second plugging cover; a first oil chamber is formed between the first floating piston and the second floating piston;
the outer cylinder is arranged on the periphery of the inner cylinder and can move along the axial direction relative to the inner cylinder; one end of the outer cylinder is sealed with the outer wall of the inner cylinder;
the blocking sleeve is arranged between the inner cylinder and the outer cylinder, is fixedly arranged with the inner cylinder and is in sealing contact with the outer cylinder; a second oil cavity is formed among the blocking sleeve, the inner cylinder and the outer cylinder; the throttle hole is communicated with the first oil cavity and the second oil cavity;
wherein,
the first air cavity and the second air cavity are filled with gas;
the first oil chamber and the second oil chamber are filled with liquid oil.
Preferably, also include:
the first supporting sleeve is arranged between the inner cylinder and the outer cylinder, is positioned at one end of the outer cylinder, is in sealing contact with the inner cylinder and the outer cylinder, and can move along with the outer cylinder;
and the second support sleeve is arranged between the inner cylinder and the outer cylinder, is positioned at the other end of the outer cylinder, is in sealing contact with the inner cylinder and the outer cylinder, and can move along with the outer cylinder.
Preferably, also include:
the first inflation nozzle is arranged on the first blocking cover and used for inflating or deflating the first air cavity;
the second inflating nozzle is arranged on the inner cylinder and is used for inflating or deflating the second air cavity;
and the oil filling nozzle is arranged on the outer cylinder and used for filling oil or discharging oil for the second oil cavity.
Preferably, also include:
the first boss is arranged in the first oil cavity, is positioned on one side of the throttling hole and is close to the first floating piston;
and the second boss is arranged in the first oil cavity and positioned on the other side of the throttling hole.
Preferably, P1> P2 or P1< P2;
wherein,
p1 is the pressure in the first air cavity when the first floating piston is abutted against the first boss;
p2 is the pressure in the second air cavity when the second floating piston collides with the second boss.
Preferably, the gas in the first gas cavity and the second gas cavity is inert gas.
Preferably, the inert gas is nitrogen.
Preferably, the liquid oil is an aviation hydraulic oil.
Preferably, the wall of the inner cylinder between the first boss and the second boss is designed to be thickened.
Preferably, the throttling holes are multiple and are arranged along the axial direction of the inner barrel and are uniformly distributed along the circumferential direction of the inner barrel.
The application has at least the following beneficial technical effects: the double-cavity buffer comprises an inner cylinder and an outer cylinder, wherein two mutually independent first air cavities and second air cavities are arranged in the inner cylinder, the outer cylinder is sleeved outside the inner cylinder, a second oil cavity is formed between the outer cylinder and the outer cylinder, and the outer cylinder and the first air cavities and the second air cavities are arranged in parallel.
Drawings
FIG. 1 is a schematic diagram of a prior art dual chamber buffer;
FIG. 2 is a schematic diagram of the construction of a dual chamber cushion of the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present application and for simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the scope of the present application.
The present application is described in further detail below with reference to fig. 1-2.
A dual chamber bumper, comprising:
the inner cylinder 1 is provided with a throttling hole 6;
the first plugging cover 2A is used for plugging one end of the inner barrel 1;
the second plugging cover 2B is used for plugging the other end of the inner barrel 1;
the first floating piston 3A is arranged in the inner cylinder 1, is in sealing contact with the inner cylinder 1, and can move along the axial direction of the inner cylinder 1; a first air cavity is formed between the first floating piston 3A and the first plugging cover 2A;
the second floating piston 3B is arranged in the inner cylinder 1, is in sealing contact with the inner cylinder 1, and can move along the axial direction of the inner cylinder 1; a second air cavity is formed between the second floating piston 3B and the second plugging cover 2B; a first oil chamber is formed between the first floating piston 3A and the second floating piston 3B;
an outer cylinder 4 provided on the outer periphery of the inner cylinder 1 and capable of moving in the axial direction relative to the inner cylinder 1; one end of the outer cylinder 4 is sealed with the outer wall of the inner cylinder 1;
the blocking sleeve 5 is arranged between the inner cylinder 1 and the outer cylinder 4, is fixedly arranged with the inner cylinder 1 and is in sealing contact with the outer cylinder 4; a second oil cavity is formed between the blocking sleeve 5 and the inner cylinder 1 and between the blocking sleeve and the outer cylinder 4; the throttle hole 6 communicates the first oil chamber with the second oil chamber;
wherein,
the first air cavity and the second air cavity are filled with gas;
the first oil chamber and the second oil chamber are filled with liquid oil.
Further, the method also comprises the following steps: the first supporting sleeve 7A is arranged between the inner cylinder 1 and the outer cylinder 4, is positioned at one end of the outer cylinder 4, is in sealing contact with the inner cylinder 1 and the outer cylinder 4, and can move along with the outer cylinder 4; and the second support sleeve 7B is arranged between the inner cylinder 1 and the outer cylinder 4, is positioned at the other end of the outer cylinder 4, is in sealing contact with the inner cylinder 1 and the outer cylinder 4, and can move along with the outer cylinder 4. The first supporting sleeve 7A and the second supporting sleeve 7B are arranged to play a role in supporting and strengthening sealing.
Further, the method also comprises the following steps: the first inflation nozzle 8A is arranged on the first blocking cover 2A and is used for inflating or deflating the first air cavity; the second inflating nozzle 8B is arranged on the inner cylinder 1 and is used for inflating or deflating the second air cavity; and the oil filling nozzle 9 is arranged on the outer cylinder 4 and used for filling oil or discharging oil for the second oil cavity.
Further, the method also comprises the following steps: a first boss 10A provided in the first oil chamber, located on one side of the orifice 6, and close to the first floating piston 3A; and a second boss 10B provided in the first oil chamber on the other side of the orifice 6.
Further, P1> P2 or P1< P2; wherein, P1 is the pressure in the first air cavity when the first floating piston 3A collides with the first boss 10A; p2 is the pressure in the second air chamber when the second floating piston 3B collides with the second boss 10B.
Furthermore, the gas in the first gas cavity and the second gas cavity is inert gas.
Further, the inert gas is nitrogen.
Further, the liquid oil is aviation hydraulic oil.
Further, the wall of the inner cylinder 1 between the first boss 10A and the second boss 10B is thickened, and the structural strength of the part is reduced due to the opening of the orifice 6, so that the structural strength of the part is compensated.
Furthermore, a plurality of orifices 6 are arranged along the axial direction of the inner cylinder 1 and are uniformly distributed along the circumferential direction of the inner cylinder 1.
When the airplane lands, impact load is borne, the outer cylinder 4 moves towards the direction of the blocking sleeve 5, the second oil cavity is compressed, liquid oil in the second oil cavity is extruded to enter the first oil cavity through the throttling hole 6, the first floating piston 3A and/or the second floating piston 3B are pushed to move in the direction opposite to the first oil cavity, the first air cavity and/or the second air cavity are/is compressed, and air in the first air cavity and/or the second air cavity is compressed to form compressed air. Wherein, the liquid oil generates damping when flowing through the throttling hole 6, partial energy carried by the impact load is dissipated, and most of the rest energy is stored by compressed gas; after the airplane is lifted off the ground, the compressed gas pushes the first floating piston 3A and/or the second floating piston 3B to move towards the direction of the first oil cavity, so that the first oil cavity is compressed, the liquid oil in the first oil cavity is squeezed to enter the second oil cavity through the throttling hole 6, and the double-cavity buffer is restored to the original state and is prepared for landing of the airplane.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A dual chamber cushion, comprising:
the inner cylinder (1) is provided with a throttling hole (6);
the first plugging cover (2A) is used for plugging one end of the inner cylinder (1);
the second plugging cover (2B) is used for plugging the other end of the inner cylinder (1);
the first floating piston (3A) is arranged in the inner cylinder (1), is in sealing contact with the inner cylinder (1), and can move along the axial direction of the inner cylinder (1); a first air cavity is formed between the first floating piston (3A) and the first plugging cover (2A);
the second floating piston (3B) is arranged in the inner cylinder (1), is in sealing contact with the inner cylinder (1), and can move along the axial direction of the inner cylinder (1); a second air cavity is formed between the second floating piston (3B) and the second plugging cover (2B); a first oil chamber is formed between the first floating piston (3A) and the second floating piston (3B);
an outer cylinder (4) which is provided on the outer periphery of the inner cylinder (1) and is capable of moving in the axial direction relative to the inner cylinder (1); one end of the outer cylinder (4) is sealed with the outer wall of the inner cylinder (1);
the blocking sleeve (5) is arranged between the inner cylinder (1) and the outer cylinder (4), is fixedly arranged with the inner cylinder (1), and is in sealing contact with the outer cylinder (4); a second oil cavity is formed among the blocking sleeve (5), the inner cylinder (1) and the outer cylinder (4); the throttle hole (6) is communicated with the first oil cavity and the second oil cavity;
wherein,
the first air cavity and the second air cavity are filled with gas;
the first oil chamber and the second oil chamber are filled with liquid oil.
2. The buffer of claim 1, further comprising:
the first supporting sleeve (7A) is arranged between the inner cylinder (1) and the outer cylinder (4), is positioned at one end of the outer cylinder (4), is in sealing contact with the inner cylinder (1) and the outer cylinder (4), and can move along with the outer cylinder (4);
and the second support sleeve (7B) is arranged between the inner cylinder (1) and the outer cylinder (4), is positioned at the other end of the outer cylinder (4), is in sealing contact with the inner cylinder (1) and the outer cylinder (4), and can move along with the outer cylinder (4).
3. The buffer of claim 1, further comprising:
the first inflation nozzle (8A) is arranged on the first blocking cover (2A) and is used for inflating or deflating the first air cavity;
the second inflating nozzle (8B) is arranged on the inner cylinder (1) and is used for inflating or deflating the second air cavity;
and the oil filling nozzle (9) is arranged on the outer cylinder (4) and is used for filling oil or discharging oil for the second oil cavity.
4. The buffer of claim 1, further comprising:
a first boss (10A) which is arranged in the first oil cavity, is positioned on one side of the throttle hole (6) and is close to the first floating piston (3A);
and the second boss (10B) is arranged in the first oil cavity and is positioned on the other side of the throttling hole (6).
5. The buffer of claim 4, wherein P1> P2 or P1< P2;
wherein,
p1 is the pressure in the first air cavity when the first floating piston (3A) collides with the first boss (10A);
p2 is the pressure in the second air cavity when the second floating piston (3B) collides with the second boss (10B).
6. The damper of claim 1, wherein the gas in the first and second gas chambers is an inert gas.
7. The buffer of claim 6, wherein the inert gas is nitrogen.
8. The damper of claim 1, wherein the liquid oil is an aviation hydraulic oil.
9. Buffer according to claim 4, characterized in that the wall of the inner cylinder (1) between the first boss (10A) and the second boss (10B) is of thickened design.
10. The damper according to claim 1, wherein the orifice (6) is plural, arranged in the axial direction of the inner tube (1), and uniformly distributed in the circumferential direction of the inner tube (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811333227.2A CN109296691B (en) | 2018-11-09 | 2018-11-09 | Double-cavity buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811333227.2A CN109296691B (en) | 2018-11-09 | 2018-11-09 | Double-cavity buffer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109296691A CN109296691A (en) | 2019-02-01 |
| CN109296691B true CN109296691B (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811333227.2A Active CN109296691B (en) | 2018-11-09 | 2018-11-09 | Double-cavity buffer |
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| Country | Link |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112124571B (en) * | 2020-09-10 | 2023-07-21 | 中国航空工业集团公司沈阳飞机设计研究所 | Outer cylinder of aircraft landing gear, manufacturing method and aircraft landing gear |
| CN112623256B (en) * | 2020-12-29 | 2022-09-20 | 中国航空工业集团公司西安飞机设计研究所 | Double-cavity undercarriage bumper model |
| CN113958650B (en) * | 2021-10-25 | 2022-09-16 | 中电建路桥集团有限公司 | Damper for noise elimination and vibration reduction of building operation equipment |
| CN114110081B (en) * | 2021-11-19 | 2023-09-08 | 中国直升机设计研究所 | Helicopter landing gear buffer |
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| CN2217143Y (en) * | 1994-11-08 | 1996-01-10 | 蒋东生 | Two-direction adjustable system for hanging vehicle rigid equipment-shock-proof and vibration damping device |
| CN203362943U (en) * | 2013-06-07 | 2013-12-25 | 陈月英 | Bidirectional damping multi-cavity gas spring |
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| Publication number | Publication date |
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| CN109296691A (en) | 2019-02-01 |
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