Undercarriage buffer of modularized reverse resistance valve structure

Abstract

The invention discloses an undercarriage buffer of a modular reverse resistance valve structure. The reverse resistance valve cover, the reverse damping valve core mounting seat and the reverse resistance valve supporting plate are arranged in the compression damping cavity and are positioned at a port, close to the rebound damping cavity, of the compression damping cavity; the reverse resistance valve cover is rigidly connected with the reverse damping valve core mounting seat, and the reverse damping valve core mounting seat is rigidly connected with the reverse resistance valve supporting plate; the throttling valve plate is placed in a valve plate cavity formed between the reverse damping valve cover and the reverse damping valve element mounting seat, and a hole of the throttling valve plate is used for being matched with an oil needle structure; an oil through hole of the reverse resistance valve supporting plate is used for arranging a fixed damping valve element or a reverse damping valve element, and the fixed damping valve element and the reverse damping valve element both face an oil through hole of the reverse resistance valve deck and an oil through hole of the reverse damping valve element installation base. The fixed damping valve element is in transition fit with the reverse resistance valve supporting plate, and the reverse damping valve element is in loose fit with the reverse resistance valve supporting plate so as to move back and forth in the universal hole of the reverse resistance valve supporting plate. Therefore, the damping coefficient of the undercarriage buffer reverse resistance valve can be changed.

Description

Technical Field

[0001] The invention relates to the technical field of landing gear buffers, in particular to a landing gear buffer with a modular anti-drag valve structure. Background Art

[0002] The landing gear buffer is a universal component that is essential for modern landing gears. It absorbs the kinetic energy of the aircraft during landing and taxiing through the damping effect generated by the oil flowing through the throttle hole. The traditional buffer is composed of a fixed damping oil hole and a reverse damping valve. The anti-damper device divides the oil chamber into a compression damping chamber and a rebound damping chamber; when the buffer is compressed, the oil flows from the compression damping chamber to the rebound damping chamber through the fixed damping oil hole and the opened reverse damping valve core; when the buffer is extended, the reverse damping valve core is closed, and the oil flows from the rebound damping chamber to the compression damping chamber through the fixed damping oil hole; the opening and closing of the reverse damping valve core changes the equivalent damping hole area of ​​the buffer, so that the damping coefficient of the buffer changes during the two movements of compression and extension, thereby improving the buffer's buffering efficiency. The existing landing gear buffer cannot adjust the buffer damping coefficient of the anti-damper valve. Summary of the invention

[0003] The invention provides a landing gear buffer with a modular anti-drag valve structure, aiming to solve the problems of the anti-drag valve of the existing landing gear buffer, that the damping coefficient cannot be changed due to a machine-added fixed damping hole, and the fatigue life of the anti-drag valve core is short due to spring control.

[0004] In a first aspect, a landing gear buffer of a modular anti-drag valve structure is provided, comprising an anti-drag valve cover, a reverse damping valve core mounting seat, an anti-drag valve support plate, a fixed damping valve core, a throttle valve plate, a reverse damping valve core, a compression damping chamber, and a rebound damping chamber;

[0005] The anti-resistance valve cover, the reverse damping valve core mounting seat, and the anti-resistance valve supporting plate are arranged in the compression damping chamber and are located at the port of the compression damping chamber close to the rebound damping chamber; the anti-resistance valve cover and the reverse damping valve core mounting seat are rigidly connected, and the reverse damping valve core mounting seat and the anti-resistance valve supporting plate are rigidly connected; the throttle valve plate is placed in the valve plate cavity formed between the anti-resistance valve cover and the reverse damping valve core mounting seat, and the hole of the throttle valve plate is used to cooperate with the oil needle structure;

[0006] The oil through hole of the anti-drag valve support plate is used to set the fixed damping valve core or the reverse damping valve core. The fixed damping valve core and the reverse damping valve core are both set facing the oil through hole of the anti-drag valve cover and the oil through hole of the reverse damping valve core mounting seat; the fixed damping valve core and the anti-drag valve support plate adopt a transition fit, and the reverse damping valve core and the anti-drag valve support plate adopt a loose fit so as to move back and forth in the universal hole of the anti-drag valve support plate.

[0007] In combination with the first aspect, in certain implementations of the first aspect, when the buffer is extended, the oil in the compression damping chamber of the buffer pushes the reverse damping valve core toward the reverse damping valve core mounting seat to block the oil passage path of the reverse damping valve core. At this time, the oil flows from the rebound damping chamber to the compression damping chamber through the fixed damping valve core;

[0008] When the buffer is compressed, the oil in the rebound damping chamber of the buffer pushes the reverse damping valve core away from the reverse damping valve core mounting seat, so that the oil passing through the reverse damping valve core mounting seat enters the oil path of the reverse damping valve core. At this time, the oil flows from the compression damping chamber to the rebound damping chamber through the fixed damping valve core and the reverse damping valve core.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the reverse damping valve core includes a damping oil hole, a side oil hole, a stop end face and a cone head; the side oil hole is opened on the side of the reverse damping valve core and is connected to the damping oil hole; the side oil hole is located between the stop end face and the cone head; the cone head is located at the end of the reverse damping valve core that is away from the damping oil hole; the outer diameter of the side of the side oil hole close to the cone head is smaller than the outer diameter of the side of the side oil hole close to the stop end face, so that the side of the side oil hole close to the cone head and the common hole wall of the reverse damping valve support plate form a space for circulating oil.

[0010] In combination with the first aspect, in certain implementations of the first aspect, a chamfer is provided at the bottom of the oil through hole of the reverse damping valve core mounting seat corresponding to the reverse damping valve core, and the chamfer is the same as the angle of the cone head of the reverse damping valve core; when the buffer is extended, the buffer compresses the oil in the damping chamber to press the reverse damping valve core into the chamfer of the bottom of the reverse damping valve core mounting seat to block the oil passage of the reverse damping valve core; when the buffer is compressed, the oil in the rebound damping chamber of the buffer presses the reverse damping valve core out of the chamfer of the bottom of the reverse damping valve core mounting seat, so that the oil flows to the rebound damping chamber through the side oil hole and the damping oil hole.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the distance from the stop end face to the rear end of the cone head is less than the depth of the oil hole of the anti-drag valve support plate; the distance from the stop end face to the rear end of the cone head is less than the depth of the oil hole of the anti-drag valve support plate; the height of the fixed damping valve core is equal to the depth of the oil hole of the anti-drag valve support plate.

[0012] In combination with the first aspect, in certain implementations of the first aspect, when the reverse damping valve core is in an open state, the stop end face of the reverse damping valve core contacts the bottom of the oil through hole of the reverse damping valve core mounting seat, and the oil in the compression damping chamber flows into the rebound damping chamber through the oil through hole of the reverse damping valve core mounting seat, the side oil hole of the reverse damping valve core, and the damping oil hole of the reverse damping valve core.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the anti-drag valve support plate includes a plurality of oil holes evenly distributed circumferentially, wherein the fixed damping valve core and the reverse damping valve core are alternately arranged in the plurality of oil holes of the anti-drag valve support plate.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the anti-drag valve support plate includes a plurality of oil holes evenly distributed circumferentially, wherein the fixed damping valve core and the reverse damping valve core are continuously and alternately arranged in the plurality of oil holes of the anti-drag valve support plate.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the number of fixed damping valve cores and reverse damping valve cores is the same or different.

[0016] In a second aspect, a landing gear is provided, comprising a landing gear buffer as described in any one of the implementations of the first aspect.

[0017] Compared with the prior art, the solution provided by the present invention includes at least the following beneficial technical effects:

[0018] 1) A modular design scheme is adopted in which an oil hole is machined on the support plate and then a fixed damping valve core 4 is embedded. When the damping coefficient of the buffer does not meet the expected target, the damping coefficient of the buffer can be adjusted by replacing the fixed damping valve core 4 with a different inner diameter.

[0019] 2) A reverse damping valve core structure with a cone head and side oil outlet holes is proposed. With the help of oil pressure, the reverse damping valve core is automatically opened during the compression process of the buffer and automatically closed during the extension process of the buffer. There is no need to control the opening and closing of the reverse damping valve core through a spring, which solves the problem of reduced reliability caused by short spring fatigue life.

[0020] 3) A plurality of fixed damping valve cores 4 and reverse damping valve cores are combined and distributed along the circumference, and the number of fixed damping valve cores 4 and reverse damping valve cores can be freely selected, which greatly improves the adaptability of the structure to the buffer design parameters.

[0021] 4) When the damping coefficient of the buffer does not meet the expected target, the damping coefficient of the buffer can be adjusted by replacing the fixed damping valve core 4 with different inner diameters, without the need to re-commission the anti-resistance valve, thereby reducing production costs and cycles.

[0022] 5) The reverse damping valve core is automatically opened and closed by relying on the oil pressure difference, which solves the problem of short fatigue life caused by the spring-controlled reverse damping valve core and improves the system reliability of the buffer.

[0023] 6) The optional number of valve cores can be adjusted according to the design parameters. The number of fixed damping valve cores 4 and reverse damping valve cores can be matched as needed to adjust the positive and reverse damping parameters. The distribution of the two valve cores can be adjusted as needed to achieve the function of balancing and adjusting the pressure generated by the oil on the end face by the reverse resistance valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a landing gear buffer with a modular anti-drag valve structure.

[0025] Figure 2 Schematic diagram of the directional damping valve core.

[0026] Figure 3 Schematic diagram of the reverse damping valve core.

[0027] Figure 4 Schematic diagram of the reverse damping valve core in the open state (left) and closed state (right).

[0028] Figure 5 It is a schematic diagram of the oil hole structure of the present invention.

[0029] Figure 6 This is a schematic diagram of Scheme 1-staggered of the present invention.

[0030] Figure 7 This is a schematic diagram of Scheme 2 of the present invention - continuous staggered.

[0031] Figure 8 This is a schematic diagram of solution 3 of the present invention - fixed damping type.

[0032] Fig. 9 This is a schematic diagram of scheme 4-reverse closed type of the present invention.

[0033] Explanation of the reference numerals: 1. Anti-resistance valve cover; 2. Reverse damping valve core mounting seat; 3. Anti-resistance valve support plate; 4. Fixed damping valve core 4; 5. Throttle valve plate; 6. Reverse damping valve core; 7. Compression damping chamber; 8. Rebound damping chamber. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 As shown, the present invention provides a landing gear buffer with a modular anti-drag valve structure, including an anti-drag valve cover 1, a reverse damping valve core mounting seat 2, an anti-drag valve support plate 3, a fixed damping valve core 4, a throttle valve plate 5, a reverse damping valve core 6, a compression damping chamber 7, and a rebound damping chamber 8.

[0036] The anti-resistance valve cover 1, the reverse damping valve core mounting seat 2, and the anti-resistance valve support plate 3 are arranged in the compression damping chamber 7, and are located at the port of the compression damping chamber 7 close to the rebound damping chamber 8. The anti-resistance valve cover 1 and the reverse damping valve core mounting seat 2 are rigidly connected by screws and aligned by stoppers. The reverse damping valve core mounting seat 2 and the anti-resistance valve support plate 3 are rigidly connected by screws and aligned by stoppers. The throttle valve plate 5 is placed in the valve plate cavity formed between the anti-resistance valve cover 1 and the reverse damping valve core mounting seat 2, and has a certain free translation space; the hole of the throttle valve plate 5 cooperates with the oil needle structure.

[0037] Combination Figure 1 The oil through hole of the anti-resistance valve support plate 3 is used to set the fixed damping valve core 4 or the reverse damping valve core 6. The fixed damping valve core 4 and the reverse damping valve core 6 are both arranged facing the oil through hole of the anti-resistance valve cover 1 and the oil through hole of the reverse damping valve core mounting seat 2. The fixed damping valve core 4 and the anti-resistance valve support plate 3 adopt a transition fit, and the reverse damping valve core 6 and the anti-resistance valve support plate 3 adopt a loose fit to move back and forth in the universal hole of the anti-resistance valve support plate 3.

[0038] When the buffer extends, the oil in the buffer compression damping chamber 7 pushes the reverse damping valve core 6 toward the reverse damping valve core mounting seat 2 to block the oil passage of the reverse damping valve core 6. At this time, the oil flows from the rebound damping chamber 8 to the compression damping chamber 7 through the fixed damping valve core 4.

[0039] When the buffer is compressed, the oil in the buffer rebound damping chamber 8 pushes the reverse damping valve core 6 away from the reverse damping valve core mounting seat 2, so that the oil passing through the reverse damping valve core mounting seat 2 enters the oil path of the reverse damping valve core 6. At this time, the oil flows from the compression damping chamber 7 to the rebound damping chamber 8 through the reverse damping valve core 4 and the reverse damping valve core 6.

[0040] like Figure 2 Shown is a fixed damping valve core 4. The damping of the fixed damping valve core 4 is achieved through a fixed damping oil hole.

[0041] like Figure 3 The reverse damping valve core 6 is shown. The reverse damping valve core 6 includes a damping oil hole, a side oil hole, a stop end face and a cone head. The side oil hole is opened on the side of the reverse damping valve core 6 and is connected to the damping oil hole. The side oil hole is located between the stop end face and the cone head. The cone head is located at the end of the reverse damping valve core 6 that is away from the damping oil hole. The outer diameter of the side of the side oil hole close to the cone head is smaller than the outer diameter of the side of the side oil hole close to the stop end face, so that the side of the side oil hole close to the cone head and the universal hole wall of the reverse damping valve support plate 3 form a space for circulating oil.

[0042] The bottom of the oil-through hole of the reverse damping valve core mounting seat 2 corresponding to the reverse damping valve core 6 is provided with a chamfer, which is the same as the angle of the cone head of the reverse damping valve core 6. The distance from the stop end face to the rear end of the cone head is less than the depth of the oil-through hole of the reverse damping valve support plate 3. The distance from the stop end face to the rear end of the cone head is less than the depth of the oil-through hole of the reverse damping valve support plate 3. The height of the fixed damping valve core 4 can be equal to the depth of the oil-through hole of the reverse damping valve support plate 3.

[0043] When the buffer extends, the oil in the buffer compression damping chamber 7 presses the reverse damping valve core 6 into the bottom chamfer of the reverse damping valve core mounting seat 2, closing the reverse damping valve core 6. At this time, the oil flows from the rebound damping chamber 8 to the compression damping chamber 7 through the fixed damping valve core 4.

[0044] When the buffer is compressed, the oil in the buffer rebound damping chamber 8 presses the reverse damping valve core 6 out from the bottom chamfer of the reverse damping valve core mounting seat 2, and opens the reverse damping valve core 6. At this time, the oil flows from the compression damping chamber 7 to the rebound damping chamber 8 through the fixed damping valve core 4 and the reverse damping valve core 6.

[0045] The equivalent damping hole area of ​​the buffer is changed by opening and closing the reverse damping valve core 6, so that the damping coefficient of the buffer changes when it moves in the compression and extension directions, thereby improving the buffering efficiency of the buffer.

[0046] When the reverse damping valve core 6 is in the open and closed states, the matching relationship between the reverse damping valve core 6 and the reverse damping valve core mounting seat is as follows: Figure 4 shown.

[0047] When the reverse damping valve core 6 is in the open state, the stop end surface of the reverse damping valve core 6 contacts the bottom of the oil through hole of the reverse damping valve core mounting seat 2, and the oil in the compression damping chamber 7 can flow into the rebound damping chamber 8 through the oil through hole of the reverse damping valve core mounting seat 2, the side oil hole of the reverse damping valve core 6, and the damping oil hole of the reverse damping valve core 6. The oil flow direction is as follows: Figure 4 As shown in the left picture.

[0048] When the reverse damping valve core 6 is in the closed state, the stop end surface of the reverse damping valve core 6 is disengaged from the reverse damping valve core mounting seat 2, and the cone head of the reverse damping valve core 6 fits with the cone surface of the hole end of the reverse damping valve core mounting seat 2 to block the oil circuit. Figure 4 As shown in the picture on the right.

[0049] According to the design parameter requirements of the landing gear buffer, the number and position of the oil holes of the anti-blocking valve support plate 3 can be flexibly adjusted. The present invention provides a layout scheme of 12 oil holes evenly distributed around the circumference, such as Figure 5 The above but not limited to the oil hole layout solutions are all within the scope of the claims of this patent.

[0050] Under the layout scheme of 12 oil holes evenly distributed on the circumference, the present invention lists 4 layout schemes of the fixed damping valve core 4 and the reverse damping valve core 6. Scheme 1 - Staggered scheme of the fixed damping valve core 4 and the reverse damping valve core 6 Figure 6 As shown, Scheme 2 - the fixed damping valve core 4 and the reverse damping valve core 6 are continuously staggered. Figure 7 As shown, Scheme 3 - Fixed Damping Scheme is as follows Figure 8 As shown, Scheme 4 - Reverse Closed Scheme is as follows Fig. 9 The above but not limited to the layout of the fixed damping valve core 4 and the reverse damping valve core 6 are all within the scope of the claims of this patent.

[0051] Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A landing gear buffer with a modular anti-drag valve structure, characterized in that: It comprises a reverse damping valve cover (1), a reverse damping valve core mounting seat (2), a reverse damping valve supporting plate (3), a fixed damping valve core (4), a throttle valve plate (5), a reverse damping valve core (6), a compression damping chamber (7), and a rebound damping chamber (8); The anti-drag valve cover (1), the reverse damping valve core mounting seat (2), and the anti-drag valve supporting plate (3) are arranged in the compression damping chamber (7) and are located at the port of the compression damping chamber (7) close to the rebound damping chamber (8); the anti-drag valve cover (1) and the reverse damping valve core mounting seat (2) are rigidly connected, and the reverse damping valve core mounting seat (2) and the anti-drag valve supporting plate (3) are rigidly connected; the throttle valve plate (5) is placed in the valve plate chamber formed between the anti-drag valve cover (1) and the reverse damping valve core mounting seat (2), and the hole of the throttle valve plate (5) is used to cooperate with the oil needle structure; The oil through hole of the anti-drag valve support plate (3) is used to set the fixed damping valve core (4) or the reverse damping valve core (6), and the fixed damping valve core (4) and the reverse damping valve core (6) are both arranged facing the oil through hole of the anti-drag valve cover (1) and the oil through hole of the reverse damping valve core mounting seat (2); the fixed damping valve core (4) and the anti-drag valve support plate (3) adopt a transition fit, and the reverse damping valve core (6) and the anti-drag valve support plate (3) adopt a loose fit, so as to move forward and backward in the universal hole of the anti-drag valve support plate (3).

2. The landing gear buffer according to claim 1, characterized in that: When the buffer extends, the oil in the compression damping chamber (7) of the buffer pushes the reverse damping valve core (6) toward the reverse damping valve core mounting seat (2) to block the oil passage of the reverse damping valve core (6). At this time, the oil flows from the rebound damping chamber (8) to the compression damping chamber (7) through the fixed damping valve core (4); When the buffer is compressed, the oil in the buffer rebound damping chamber (8) pushes the reverse damping valve core (6) away from the reverse damping valve core mounting seat (2), so that the oil passing through the reverse damping valve core mounting seat (2) enters the oil passage path of the reverse damping valve core (6). At this time, the oil flows from the compression damping chamber (7) to the rebound damping chamber (8) through the fixed damping valve core (4) and the reverse damping valve core (6).

3. The landing gear buffer according to claim 1, characterized in that: The reverse damping valve core (6) comprises a damping oil hole, a side oil hole, a stop end face and a cone head; the side oil hole is arranged on the side of the reverse damping valve core (6) and is connected to the damping oil hole; the side oil hole is located between the stop end face and the cone head; the cone head is located at the end of the reverse damping valve core (6) away from the damping oil hole; the outer diameter of the side of the side oil hole close to the cone head is smaller than the outer diameter of the side of the side oil hole close to the stop end face, so that the side of the side oil hole close to the cone head and the universal hole wall of the reverse damping valve support plate (3) form a space for circulating oil.

4. The landing gear buffer according to claim 3, characterized in that: The bottom of the oil passage hole of the reverse damping valve core mounting seat (2) corresponding to the reverse damping valve core (6) is provided with a chamfer, and the chamfer has the same angle as the cone head of the reverse damping valve core (6); when the buffer is extended, the buffer compresses the oil in the damping chamber (7) to press the reverse damping valve core (6) into the chamfer at the bottom of the reverse damping valve core mounting seat (2) to block the oil passage path of the reverse damping valve core (6); when the buffer is compressed, the oil in the rebound damping chamber (8) of the buffer presses the reverse damping valve core (6) out of the chamfer at the bottom of the reverse damping valve core mounting seat (2) to allow the oil to flow to the rebound damping chamber (8) through the side oil hole and the damping oil hole.

5. The landing gear buffer according to claim 3, characterized in that: The distance from the stop end surface to the rear end of the cone head is less than the depth of the oil through hole of the anti-resistance valve support plate (3); the distance from the stop end surface to the rear end of the cone head is less than the depth of the oil through hole of the anti-resistance valve support plate (3); and the height of the fixed damping valve core (4) is equal to the depth of the oil through hole of the anti-resistance valve support plate (3).

6. The landing gear buffer according to claim 3, characterized in that: When the reverse damping valve core (6) is in an open state, the stop end surface of the reverse damping valve core (6) contacts the bottom of the oil through hole of the reverse damping valve core mounting seat (2), and the oil in the compression damping chamber (7) flows into the rebound damping chamber (8) through the oil through hole of the reverse damping valve core mounting seat (2), the side oil hole of the reverse damping valve core (6), and the damping oil hole of the reverse damping valve core (6).

7. The landing gear buffer according to claim 1, characterized in that: The anti-resistance valve support plate (3) comprises a plurality of oil-through holes evenly distributed in the circumferential direction, wherein the fixed damping valve core (4) and the reverse damping valve core (6) are arranged in a staggered manner in the plurality of oil-through holes of the anti-resistance valve support plate (3).

8. The landing gear buffer according to claim 1, characterized in that: The anti-resistance valve support plate (3) comprises a plurality of oil-through holes evenly distributed in the circumferential direction, wherein the fixed damping valve core (4) and the reverse damping valve core (6) are continuously and staggeredly arranged in the plurality of oil-through holes of the anti-resistance valve support plate (3).

9. The landing gear buffer according to claim 1, characterized in that: The number of the fixed damping valve core (4) and the reverse damping valve core (6) is the same or different.

10. A landing gear, characterized in that: Comprising a landing gear buffer as claimed in any one of claims 1 to 9.

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