Sealing connection device for aerospace undercarriage

Abstract

The utility model provides a sealing connecting device for an aerospace undercarriage, which comprises a connecting seat body, a sealing element is mounted on the connecting seat body, the outer side of the sealing element is mounted on the connecting seat body through a pressing plate, the connecting seat body is of an annular frame structure, a central through hole is formed in the middle of the connecting seat body, and the connecting seat body is of a hollow structure. A central through hole is formed in the connecting seat body, related parts of the undercarriage penetrate through the central through hole, a sealing groove matched with a sealing piece is machined in the inner side wall of the connecting seat body, a pressing plate is arranged at an outer side port of the sealing groove, and the pressing plate is fixedly connected with the connecting seat body through fastening bolts which are evenly distributed. According to the utility model, the sealing element is effectively prevented from shifting and falling off, the reliability and the stability of the sealing connection of the undercarriage are greatly improved, the fault risk caused by sealing failure is reduced, and the flight safety is improved. The specially designed structure facilitates installation and replacement of the sealing element, the sealing element can be overhauled or replaced only by disassembling the pressing plate bolt during maintenance, and the maintenance time and cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of aerospace technology, specifically a sealing connection device for aerospace landing gear. Background Technology

[0002] In the aerospace field, landing gear is a crucial component of aircraft, and its performance directly affects the safety and reliability of takeoff and landing. During operation, landing gear must withstand enormous impacts, vibrations, and harsh environmental factors, making sealing particularly critical. Existing landing gear sealing devices are prone to wear, loosening, and even leakage of seals after prolonged use, leading to seal failure and impacting normal landing gear operation, thus increasing flight risks. Therefore, there is an urgent need for a sealing connection device that can effectively prevent seal leakage and adapt to the operating conditions of landing gear.

[0003] Currently, the commonly used sealing methods for aerospace landing gear mainly include the following: Lip seals: These seals rely on the tight contact between the lip and the mating surface to achieve a seal. However, under the frequent extension, contraction, vibration, and impact of the landing gear, the lip of the lip seal is prone to deformation and wear, leading to an increased sealing gap and decreased sealing performance. Moreover, when particulate impurities from the external environment enter the sealing gap, they will exacerbate the wear of the lip, further shortening the service life of the seal.

[0004] O-ring seals: O-ring seals have a simple structure and low cost. However, O-rings are prone to hardening and softening under high and low temperature environments, leading to decreased elasticity and reduced sealing performance. Furthermore, after long-term compression and deformation, O-rings can undergo permanent deformation, making it impossible to return to their initial sealing state, thus causing leakage problems.

[0005] Labyrinth seals: Labyrinth seals prevent fluid leakage by using a throttling principle through multiple layers of convoluted channels. However, this sealing method requires extremely high installation precision; even minor installation errors can significantly reduce the sealing effect. Furthermore, labyrinth seals cannot effectively prevent the entry of fine particulate impurities; the accumulation of impurities within the channels affects sealing performance and makes cleaning and maintenance difficult.

[0006] Furthermore, most existing sealing structures are installed independently, with low integration with other landing gear components, resulting in a complex overall structure, large space occupation, and increased landing gear weight and design complexity. At the same time, maintenance and replacement of seals often require the disassembly of numerous parts, making the operation cumbersome, consuming significant time and manpower costs, and severely impacting aircraft maintenance efficiency and availability. Utility Model Content

[0007] The technical problem solved by this utility model is to provide a sealing connection device for aerospace landing gear, so as to solve the problems mentioned in the background art.

[0008] The technical problem solved by this utility model is achieved by the following technical solution: A sealing connection device for aerospace landing gear, comprising: a connecting seat body, on which a sealing element is installed, the outer side of which is mounted on the connecting seat body by a pressure plate, the connecting seat body being an annular frame structure, a central through hole in the middle of the connecting seat body, through which landing gear components pass, a sealing groove adapted to the sealing element being machined on the inner side wall of the connecting seat body, and a pressure plate being provided at the outer end of the sealing groove, the pressure plate being fixedly connected to the connecting seat body by evenly distributed fastening bolts.

[0009] Furthermore, the sealing element includes a sealing element body, the outer side of the sealing element body is provided with a plurality of sealing connection protrusions, the upper end of the sealing element body is provided with an upper connection end, and the lower end of the sealing element body is provided with a lower connection end.

[0010] Furthermore, the connecting seat is installed on the connecting part at the bottom of the piston body. The connecting part is used to connect with the piston rod. The connecting part and the piston rod are connected by high-strength bolts and are provided with anti-loosening nuts and sealing washers.

[0011] Furthermore, the connecting seat is provided with multiple positioning holes and mounting holes for connecting with other components of the landing gear.

[0012] Furthermore, a positioning connection layer is provided on the contact surface between the pressure plate and the connecting seat.

[0013] Furthermore, the connecting seat and pressure plate are provided with several bolt fixing holes.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) Effectively prevents the seals from shifting and coming off, greatly improving the reliability and stability of the landing gear sealing connection, reducing the risk of failure due to seal failure, and improving flight safety.

[0016] (2) The specially designed structure facilitates the installation and replacement of the seals. During maintenance, only the pressure plate bolts need to be removed to inspect or replace the seals, reducing maintenance time and costs.

[0017] (3) The design of the positioning holes and mounting holes on the connecting base makes the assembly of this component with other landing gear parts more precise and convenient, and improves the overall assembly efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a cross-sectional schematic diagram of the sealing element body of this utility model.

[0020] Figure 3 This is a schematic diagram of the sealing element body structure of this utility model. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; and they can be internal connections between two components.

[0022] Example 1

[0023] like Figures 1-3 As shown, a sealing connection device for aerospace landing gear includes: a connecting base 1, on which a sealing element 2 is installed. The sealing element 2 is mounted on the connecting base 1 via a pressure plate 3. The connecting base 1 has an annular frame structure and a central through hole in its middle, through which landing gear components pass. A sealing groove adapted to the sealing element 2 is machined on the inner wall of the connecting base 1. A pressure plate 3 is provided at the outer end of the sealing groove, and the pressure plate 3 is fixedly connected to the connecting base 1 by evenly distributed fastening bolts. The sealing element 2 includes a sealing element body 21, with several sealing connection protrusions 22 on its outer side. An upper connection end 23 is provided at the upper end of the sealing element body 21, and a lower connection end 24 is provided at the lower end of the sealing element body 21.

[0024] Example 2

[0025] like Figures 1-3 As shown, a sealing connection device for aerospace landing gear includes: a connecting seat 1, on which a sealing element 2 is installed. The outer side of the sealing element 2 is mounted on the connecting seat 1 via a pressure plate 3. The connecting seat 1 has an annular frame structure, with a central through hole in the middle through which landing gear components pass. A sealing groove adapted to the sealing element 2 is machined on the inner sidewall of the connecting seat 1. A pressure plate 3 is provided at the outer end of the sealing groove, and the pressure plate 3 is fixedly connected to the connecting seat 1 by evenly distributed fastening bolts. The connecting seat 1 is installed on a connecting part at the bottom of a piston body. The connecting part is used to connect to the piston rod. The connecting part and the piston rod are connected by high-strength bolts and are provided with anti-loosening nuts and sealing washers.

[0026] Example 3

[0027] like Figures 1-3 As shown, a sealing connection device for aerospace landing gear includes: a connecting base 1, on which a sealing element 2 is installed. The outer side of the sealing element 2 is mounted on the connecting base 1 via a pressure plate 3. The connecting base 1 has a ring-shaped frame structure, with a central through hole in the middle through which landing gear components pass. A sealing groove adapted to the sealing element 2 is machined on the inner wall of the connecting base 1. A pressure plate 3 is provided at the outer end of the sealing groove, and the pressure plate 3 is fixedly connected to the connecting base 1 by evenly distributed fastening bolts. The connecting base 1 has multiple positioning holes and mounting holes for connecting with other landing gear components.

[0028] Example 4

[0029] like Figures 1-3 As shown, a sealing connection device for aerospace landing gear includes: a connecting base 1, on which a sealing element 2 is installed. The sealing element 2 is mounted on the connecting base 1 via a pressure plate 3. The connecting base 1 has an annular frame structure and a central through hole in its middle, through which landing gear components pass. A sealing groove adapted to the sealing element 2 is machined on the inner wall of the connecting base 1. A pressure plate 3 is provided at the outer end of the sealing groove, and the pressure plate 3 is fixedly connected to the connecting base 1 by evenly distributed fastening bolts. A positioning connection layer is provided on the contact surface between the pressure plate and the connecting base. The positioning connection layer has good flatness and roughness to ensure uniformity of the clamping effect.

[0030] Example 5

[0031] like Figures 1-3 As shown, a sealing connection device for aerospace landing gear includes: a connecting base 1, on which a sealing element 2 is installed. The outer side of the sealing element 2 is mounted on the connecting base 1 via a pressure plate 3. The connecting base 1 has a ring-shaped frame structure, with a central through hole in the middle through which landing gear components pass. A sealing groove adapted to the sealing element 2 is machined on the inner wall of the connecting base 1. A pressure plate 3 is provided at the outer end of the sealing groove, and the pressure plate 3 is fixedly connected to the connecting base 1 by evenly distributed fastening bolts. The connecting base 1 and the pressure plate 3 are provided with a plurality of bolt fixing holes.

[0032] The production process of this utility model includes:

[0033] (1) Connection Assembly: Align the connecting part of the piston body with the piston rod, connect them using high-strength bolts, and then install the anti-loosening nut and sealing washer to ensure a firm connection without leakage. Material Selection: The connecting seat is made of high-strength and lightweight titanium alloy to meet the stringent requirements of aerospace for component strength and weight; the seals are made of high-temperature resistant and wear-resistant fluororubber; the pressure plate is made of aluminum alloy, balancing strength and lightness.

[0034] (2) Processing and manufacturing: The connecting seat is machined according to the precise design dimensions to ensure the dimensional accuracy and surface quality of the sealing groove; the pressure plate is also precision machined to ensure its fit with the connecting seat.

[0035] (3) Assembly process: First, the seal is smoothly embedded into the sealing groove of the connecting seat. Then, the pressure plate is placed on the outer end of the sealing groove, aligned with the bolt hole, and the bolt is tightened with a tool of specific torque so that the pressure plate presses the seal evenly.

[0036] (4) Testing and verification: Install the assembled sealing connection assembly onto the simulated landing gear device, conduct vibration and load tests on simulated take-off and landing, check the sealing performance and stability of the assembly, and make necessary adjustments and optimizations based on the test results.

[0037] The piston body of this utility model (1) has a connecting part at its bottom, which is used to connect with the piston rod. The connecting part and the piston rod are connected by high-strength bolts, and are provided with anti-loosening nuts and sealing washers. This connection method ensures the connection strength and sealing performance between the piston and the piston rod. This sealing connection assembly includes a blue connecting seat, which has a specific annular frame structure and is provided with multiple positioning holes and mounting holes for connecting with other landing gear components. The central hole of the connecting seat is used for the through passage of landing gear related components.

[0038] (2) A sealing groove adapted to the sealing element is machined on the inner wall of the connecting seat. The shape and size of the groove are specially designed to fit the sealing element tightly.

[0039] (3) A pressure plate is provided at the outer end of the sealing groove. The pressure plate is fixedly connected to the connecting seat by evenly distributed fastening bolts. This structural design can form a stable clamping force on the outer end of the seal by tightening the bolts after the seal is installed, effectively preventing the seal from falling off due to external force during the operation of the landing gear.

[0040] (4) The contact surface between the pressure plate and the connecting seat is specially treated to have good flatness and roughness to ensure the uniformity of the pressing effect.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing connection device for aerospace landing gear, comprising: A connecting seat (1) is characterized in that: a sealing element (2) is installed on the connecting seat (1), the outer side of the sealing element (2) is installed on the connecting seat (1) by a pressure plate (3), the connecting seat (1) is a ring frame structure, the middle part of the connecting seat (1) is provided with a central through hole, the landing gear related components pass through the central through hole, the inner side wall of the connecting seat (1) is machined with a sealing groove adapted to the sealing element (2), a pressure plate (3) is provided at the outer port of the sealing groove, and the pressure plate (3) is fixedly connected to the connecting seat (1) by evenly distributed fastening bolts.

2. The sealing connection device for aerospace landing gear according to claim 1, characterized in that: The sealing element (2) includes a sealing element body (21), the outer side of the sealing element body (21) is provided with a plurality of sealing connection protrusions (22), the upper end of the sealing element body (21) is provided with an upper connection end (23), and the lower end of the sealing element body (21) is provided with a lower connection end (24).

3. The sealing connection device for aerospace landing gear according to claim 1, characterized in that: The connecting seat (1) is installed on the connecting part at the bottom of the piston body. The connecting part is used to connect with the piston rod. The connecting part and the piston rod are connected by high-strength bolts and are provided with anti-loosening nuts and sealing washers.

4. A sealing connection device for aerospace landing gear according to claim 1, characterized in that: The connecting seat (1) is provided with several positioning holes and mounting holes for connecting with other components of the landing gear.

5. A sealing connection device for aerospace landing gear according to claim 1, characterized in that: A positioning connection layer is provided on the contact surface between the pressure plate and the connecting seat.

6. A sealing connection device for aerospace landing gear according to claim 1, characterized in that: The connecting seat (1) and the pressure plate (3) are provided with several bolt fixing holes.

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