Vibration isolation device

Abstract

This invention relates to a vibration isolation device (100), comprising: an end cap (110) disposed at a first end of the vibration isolation device (100); a base (120) disposed at a second end of the vibration isolation device (100) opposite to the first end; and a vibration isolation elastic member disposed between the end cap (110) and the base (120). The device is characterized in that, after assembly, the end cap (110), the base (120), and the vibration isolation elastic member form a through channel arranged vertically between the first end and the second end, sequentially passing through the end cap (110), the vibration isolation elastic member, and the base (120). The vibration isolation device according to the invention can reduce the impact of impact loads on critical equipment, improve flight safety, and is easy to install at the bolt structure of an aircraft.

Description

Technical Field

[0001] This invention relates to the field of mechanical design and manufacturing, and more specifically to a vibration isolation device, which can be applied, for example, to meet the technical requirements of modern large civil aircraft to achieve shock resistance. Background Technology

[0002] During normal flight of modern large civil airliners, airborne equipment is often subjected to impact loads. Impacts include taxiing, landing, and gusts encountered during flight. Current standards specify vibration and impact environment test conditions for different areas of the aircraft. However, in actual situations, when conducting equipment qualification tests according to these standards, critical equipment often suffers damage due to excessive input loads.

[0003] Currently, vibration isolators that achieve impact resistance mainly fall into two categories. The first category uses a support connection. Traditional vibration isolators are mostly fixed to the support surface using multiple sets of bolts and a base. However, this method is only suitable for specific structures and has installation limitations. Installation may damage the structure. In fact, many structures are not designed with vibration isolator support installation in mind, and the multiple bolt fixation is very inconvenient in actual use. The second category mostly uses single-stage vibration isolation, achieving the isolation effect through rubber or disc springs. However, for structures such as civil aircraft landing gear, which frequently bear high-magnitude impact loads, single-stage vibration isolation is insufficient to reduce the impact of external excitation on the structure.

[0004] CN103697241A discloses a metal-rubber-disc spring all-metal composite hanger for pipeline vibration isolation and impact resistance. This invention includes a metal-rubber mesh pad and disc springs, as well as a gland, guide rod, load-bearing bolt, housing, and an extension rod and universal ball joint for supporting and fixing these elastic elements. This invention utilizes the high load-bearing capacity and soft stiffness characteristics of disc springs, the Coulomb damping between disc springs, and the air damping in the gap between the guide rod and the load-bearing bolt to achieve complex soft and hard stiffness characteristics and high damping.

[0005] The device is connected to the pipeline structure, making it unsuitable for use on equipment connected to fasteners in civil aircraft; the solution does not consider the installation form of the structure, the load-bearing bolts used are applicable to few structures, and the bolt size is small, resulting in a small load capacity; the solution only uses a combination of disc springs and metal rubber mesh pads, which can only achieve limited vibration isolation effect.

[0006] CN112527027A discloses a passive ultra-low frequency angular vibration control system and its vibration control method. The invention includes a mounting frame and a top cover plate. Multiple vertical shock absorbers are fixed in the middle area of ​​the mounting frame's base plate, and transverse shock absorbers are symmetrically fixed around the base plate. Quasi-zero stiffness supports are fixed in the length, width, and corners of the base plate. The upper ends of the vertical shock absorbers and quasi-zero stiffness supports are fixed to the top cover plate, and there is a height gap between the top cover plate and the mounting frame. The quasi-zero stiffness supports achieve quasi-zero stiffness characteristics and ultra-low frequency angular vibration control. The vertical shock absorbers provide limiting and shock absorption in the vertical, pitch, and roll directions when the vibration amplitude exceeds a design threshold. The transverse shock absorbers are arranged along the longitudinal and transverse directions of the mounting frame, providing shock protection in the transverse, longitudinal, and attitude angle directions.

[0007] The device consists of a mounting frame and a top cover plate, with a gap between the top cover plate and the mounting frame. It has a large overall volume and a small applicable range. The device requires an installation platform to meet its usage requirements. The device achieves three-dimensional vibration isolation through multiple vertical, horizontal and longitudinal mounting devices, making its structure complex.

[0008] CN207195971U discloses an impact-resistant disc spring base. This design includes a base panel with a disc spring sleeve on the panel. The disc spring sleeve includes a sleeve, a guide rod inside the sleeve, and a disc spring fitted onto the guide rod. The upper part of the disc spring has a pressure cap and a mounting sleeve. This design effectively isolates impacts and ensures the normal operation of the installed equipment.

[0009] The device is designed as a base panel, which can only be placed on the bottom of large equipment in actual use, and the bottom needs to be fixed, making it difficult to use for fastener connections. In this solution, disc spring assemblies are only set in the vertical direction to achieve vertical vibration isolation. The number of disc springs and the vibration isolation effect that can be achieved are fixed.

[0010] CN207195971U discloses a quasi-zero stiffness vibration isolation device. This utility model includes a disc spring vibration isolation mechanism and a cross vibration isolation mechanism. The disc spring vibration isolation mechanism includes a support assembly, an intermediate shaft assembly, and a slotted disc spring. The support assembly includes a cylindrical support outer ring with openings at the top and bottom. The intermediate shaft assembly includes an intermediate shaft concentrically arranged within the support outer ring. At least one slotted disc spring is sleeved on the intermediate shaft, with the radially inner side of the slotted disc spring embedded in the intermediate shaft and the radially outer side embedded in the support outer ring. The cross vibration isolation mechanism includes an upper cross bracket and a lower cross bracket arranged horizontally and at intervals. The intermediate shaft passes upward through the through hole of the upper cross bracket and out of the upper end face of the upper cross bracket, and the upper part of the support outer ring is connected to the lower part of the upper cross connecting bracket.

[0011] The proposed solution uses a cylindrical support outer ring as the support structure, which limits the applicable vibration isolation range. The solution also uses slotted disc springs embedded in the intermediate shaft, which limits the number of disc springs that can be installed at the internal cylindrical support. Furthermore, the upper and lower cross brackets used in this solution are not conducive to installation, and the overall vibration isolation device is large in size and weight.

[0012] CN211288384U discloses a quick-locking positioning pin. This utility model relates to the field of positioning pin technology and includes a positioning body, a tensioning core, and a disc spring support. A self-locking disc spring assembly is provided between the disc spring support and the positioning body. A helical spring and a counter-push are provided on one side of the self-locking disc spring assembly. A compensation ring and a compensation ring retaining ring are provided on the outer wall of the positioning body. A number of ball sockets are evenly distributed at equal angles at the end of the tensioning core. A spherical through groove corresponding to the meaning of the ball socket is provided on the positioning body.

[0013] This solution uses disc spring supports and helical springs to achieve vertical vibration isolation during rapid positioning, but the vibration isolation effect is limited when facing high loads; this solution needs to be placed in a specific location to meet its usage requirements; the number of disc springs and the effect that can be achieved in this solution are fixed.

[0014] US20050011714A1 discloses a vibration-damping element for use in the frame of engines, machines, or equipment. To reduce structural resonance, particularly for hand tools such as chainsaws, parting mills, or similar devices, the device includes a helical spring and an additional mass block. An elastic material is disposed between the helical spring and the additional mass block, with a gap between the elastic material and the helical spring.

[0015] This solution uses an additional mass block and a helical spring to achieve unidirectional vibration isolation for manual tools, but it is difficult to achieve a good three-dimensional vibration isolation effect when facing high loads. The solution uses helical springs and guide components, but the number of helical springs that can be selected for the internal guide components is limited.

[0016] Therefore, it is necessary to improve and design a vibration isolator that is suitable for connecting structures and can significantly reduce the impact of impact loads on the structure, thereby improving the flight safety of civil aircraft. Summary of the Invention

[0017] Based on the aforementioned technical problems in the prior art, the present invention aims to provide a vibration isolation device for reducing the impact of impact loads on critical equipment, improving flight safety, and this vibration isolation device is easy to install at the bolt structure of an aircraft.

[0018] Therefore, the present invention provides a vibration isolation device.

[0019] include:

[0020] End cap, the end cap being disposed at the first end of the vibration isolation device;

[0021] A base, the base being disposed at the second end of the vibration isolation device opposite to the first end;

[0022] A vibration-damping elastic element is disposed between the end cap and the base.

[0023] in,

[0024] After the end cap, the base, and the vibration-damping elastic element are assembled, a through channel is formed between the first end and the second end, which is vertically arranged through the end cap, the vibration-damping elastic element, and the base in sequence.

[0025] According to a preferred embodiment of the vibration isolation device of the present invention, the through channel is in the form of a cylindrical through hole.

[0026] According to a preferred embodiment of the vibration isolation device of the present invention, the through channel is formed by sequentially connecting an end cap through hole located at the geometric center of the end cap, an elastic element through hole located at the geometric center of at least one of the vibration isolation elastic elements, and a base through hole located at the geometric center of the base.

[0027] According to a preferred embodiment of the vibration isolation device of the present invention, the vibration isolation elastic element includes a tension spring supported between the end cap and the base respectively and providing a restoring force, wherein the component of the restoring force in the vertical direction is always greater than zero.

[0028] According to a preferred embodiment of the vibration isolation device of the present invention, the tension spring includes multiple sets of steel springs symmetrically distributed around the center of the vibration isolation device, and the multiple sets of steel springs are respectively connected to the end cover and the base through corresponding spring mounting through holes opened on the edges of the end cover and the base.

[0029] According to a preferred embodiment of the vibration isolation device of the present invention, the base includes a cavity at one end near the end cap, and at least one fine groove is formed at the bottom of the cavity.

[0030] And among them,

[0031] The vibration isolation elastic element further includes a first-stage spring disposed in the cavity and a second-stage spring disposed in the groove. The first-stage spring and the second-stage spring are connected to each other at their ends. The other end of the first-stage spring is connected to the end cap, and the other end of the second-stage spring is connected to the base.

[0032] According to a preferred embodiment of the vibration isolation device of the present invention, the first stage spring is a rubber stack spring including the through hole of the elastic element.

[0033] According to a preferred embodiment of the vibration isolation device of the present invention, the second-stage spring includes at least one set of disc springs with their respective central guide posts sleeved in the center, and the bottom of the first-stage spring and the bottom of the groove are respectively provided with central guide post receiving holes for accommodating the corresponding central guide posts.

[0034] According to a preferred embodiment of the vibration isolation device of the present invention, one end of the central guide post inserted into the groove is provided with an external thread, and the bottom section of the groove is provided with an internal thread for spiral fixing with the central guide post.

[0035] According to a preferred embodiment of the vibration isolation device of the present invention, the second-stage spring further includes a flat washer disposed at one end of each set of disc springs near the first-stage spring.

[0036] In summary, the present invention isolates the excitation at critical airborne equipment by addressing the transmission path, preventing resonance and reducing the response at the equipment, while allowing bolts to pass through.

[0037] The technical advantages of this invention are at least its small size and light weight, making it easy to install on support equipment and effectively isolating vertical and lateral vibrations. This device is used in accordance with the relevant requirements for airborne equipment impact and crash safety environment testing, and the connection points between the single-ear or double-ear structure and the equipment support, or the locations with fastener connections, can be selected as the installation locations for the vibration isolators. Attached Figure Description

[0038] This document includes accompanying drawings to provide a further understanding of various embodiments. The drawings are incorporated in and form part of this specification.

[0039] The accompanying drawings illustrate various embodiments described herein and, together with the textual description, serve to explain the principles and operation of the claimed subject matter.

[0040] With reference to the above objectives, the technical features of the present invention are clearly described below, and its advantages will be apparent from the following detailed description with reference to the accompanying drawings, which illustrate preferred embodiments of the invention by way of example, without limiting the scope of the invention.

[0041] In the attached image:

[0042] Figure 1 This is a frontal sectional view of a preferred embodiment of the vibration isolation device according to the present invention, taken along a section passing through the vertical direction.

[0043] Figure 2 yes Figure 1 The figure shown is a perspective view of the base of a preferred embodiment of the vibration isolation device according to the present invention.

[0044] Figure 3 yes Figure 1The diagram shows a perspective view of the end cap of a preferred embodiment of the vibration isolation device according to the present invention.

[0045] Figure 4 yes Figure 1 The figure shown is a three-dimensional schematic diagram of the first-stage spring of a preferred embodiment of the vibration isolation device according to the present invention.

[0046] List of reference numerals

[0047] 100 Vibration Isolation Device

[0048] 110 End Cap

[0049] 111 End cap through hole

[0050] 120 base

[0051] 121 Base through hole

[0052] 122 Cavity

[0053] 123 Fine groove

[0054] 130A First Stage Spring

[0055] 130B Second Stage Spring

[0056] 130C tension spring

[0057] 131 Through hole for elastic element

[0058] 132 center guide post Detailed Implementation

[0059] Embodiments of the invention will now be described in detail, examples of which are shown in the accompanying drawings and described below.

[0060] Although the invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the invention to the embodiments illustrated.

[0061] Conversely, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modifications, equivalent forms and other embodiments that may be included within the spirit and scope of the invention.

[0062] To facilitate explanation and precise definition of the technical solutions of the present invention, the terms "upper," "lower," "inner," and "outer" are used to describe these features with reference to the positions of features in the exemplary embodiments shown in the accompanying drawings.

[0063] Various preferred but non-limiting embodiments of the envelope of the present invention will be described in detail below with reference to the accompanying drawings.

[0064] A general schematic diagram of a preferred embodiment of the vibration isolation device 100 of the present invention is shown below. Figure 1 As shown in the image.

[0065] The vibration isolation device 100 according to the present invention mainly includes an end cap 110, a base 120 and a vibration isolation elastic element.

[0066] The end cap 110 is located at the first end of the vibration isolation device 100, i.e. Figure 1 The upper part of the middle.

[0067] The base 120 is located at the second end of the vibration isolation device 100 opposite to the first end, i.e. Figure 1 The lower end is opposite to the upper end. In the art, the part that is fixedly mounted on the base 120 may also be referred to as the main body of the vibration isolation device 100. One end of the base 120 is connected to the lug platform or equipment support platform (not shown in the figure), and the other end is close to the end cover 110.

[0068] A vibration-damping elastic element is disposed between the end cap 110 and the base 120 to provide vibration isolation between the two.

[0069] More specifically, the aforementioned vibration isolation elastic element may include a tension spring 130C supported between the end cap 110 and the base 120 respectively and providing a restoring force, wherein the vertical component of the restoring force is always greater than zero.

[0070] In the preferred embodiment shown in the figure, the tension spring 130C may include multiple sets of steel springs symmetrically distributed around the center of the vibration isolation device, for example, four sets of steel springs distributed at 90° intervals. These multiple sets of steel springs can be connected to the end cap 110 and the base 120 respectively through corresponding spring mounting through holes opened on the edge of the end cap 110 and the cylinder wall of the base 120. The aforementioned spring mounting through holes have, for example, a diameter of 0.5 mm. In addition, other types of tension springs 130C can be selected according to actual needs, and the installation method can be designed accordingly, as long as they can provide a continuous restoring force between the end cap 110 and the base 120. Initially, the aforementioned tension spring 130C is in a compressed state, and the vertical component of the force can provide the initial restoring force. When the end cap 110 is subjected to a compressive force transmitted downward from its upper end surface, since the relative displacement inside the entire device is small, the tension spring 130C bears the tension force, and the vertical component of the force continuously provides the restoring force, helping the vibration isolation device 100 to return to the equilibrium position when not subjected to load.

[0071] Furthermore, the aforementioned vibration-damping elastic element may preferably include a first-stage spring 130A and a second-stage spring 130B. A detailed description follows.

[0072] See attached diagram. Figure 1 , Figure 2 and Figure 4In a preferred embodiment, the end of the base 120 near the end cap 110 may include a cavity 122, and the bottom of the cavity 122 may have at least one groove 123. Thus, the vibration-damping elastic element may further include a first-stage spring 130A disposed in the cavity 122 and a second-stage spring 130B disposed in the groove 123. The first-stage spring 130A and the second-stage spring 130B may be connected to each other at their ends. The other end of the first-stage spring 130A is connected to the end cap 110, and the other end of the second-stage spring 130B is connected to the base 120.

[0073] The first-stage spring 130A can be a rubber stack spring including an elastic element through-hole 131. It should be noted that the rubber stack spring can be replaced with corresponding conical rubber or silicone rubber depending on the stiffness characteristics. It should be pointed out that although a cylindrical rubber stack spring is preferably selected (see...),... Figure 4 The rubber stack spring and the cylindrical cavity 122 that match its shape are provided. However, those skilled in the art will understand that the shape of the rubber stack spring and the cavity 122 can also be other non-circular shapes, and the shape of the cavity 122 does not need to be consistent with the shape of the rubber stack spring, as long as it can stably accommodate the rubber stack spring.

[0074] The second-stage spring 130B may include at least one set, preferably four disc springs arranged circumferentially at 90-degree intervals as shown in the accompanying drawings, each fitted onto a central guide post 132. The bottom of the first-stage spring 130A and the bottom of the groove 123 are respectively provided with central guide post receiving holes to accommodate the corresponding central guide posts 132. Thus, the aforementioned disc spring assembly can be aligned by fitting onto the central guide posts 132. Generally, the required number of disc springs is initially calculated based on the load and allowable displacement of the equipment, which will not be elaborated here. Disc springs are usually installed in a mating manner, for example, in groups of 4-6, to reduce vertical displacement. A flat washer of the same size can be fitted to the upper end of each group of disc springs to make the force on each group of disc springs more even. Of course, those skilled in the art can also choose other installation methods according to the actual situation.

[0075] Specifically, in the preferred embodiment shown in the figure, the lower end face of the rubber stack spring is connected to the uppermost part of the disc spring. To accommodate the threaded guide post and the disc spring assembly, a center guide post receiving hole corresponding to the center guide post 132 can be provided at the bottom of the rubber stack spring, so that the lower end face of the rubber stack spring is inserted into the upper end of the center guide post 132 and pressed against the disc spring assembly (or flat washer). In conjunction with the working displacement of the disc spring assembly, the rubber stack spring will also move up and down, providing some vertical stiffness. At the same time, the outer side of the rubber stack spring is in close contact with the inner wall of the base, providing lateral and axial stiffness for lateral and axial impact loads, thereby achieving three-dimensional vibration isolation function.

[0076] In the case where a second-stage spring 130B (acting as a disc spring) and a center guide post 132 are present, the end of the center guide post 132 that inserts into the slot 123 may have external threads and is called a threaded guide post, while the bottom section of the slot 123 has internal threads and is called a threaded groove, for screwing and fixing with the center guide post 132. The threaded section of the threaded guide post has a fixed length and is screwed into the threaded groove during installation. The length of the threaded guide post can be adjusted according to the number of disc springs.

[0077] In addition, the second-stage spring 130B also includes a flat washer disposed at one end of each disc spring near the first-stage spring 130A.

[0078] According to the concept of the present invention, after the end cap 110, the base 120 and the vibration isolation elastic member are assembled, a through channel is formed between the first end and the second end, which is arranged vertically through the end cap 110, the vibration isolation elastic member and the base 120 in sequence.

[0079] In the preferred embodiment shown in the figure, the through channel can preferably be in the form of a cylindrical through hole to better accommodate bolt installation. However, those skilled in the art will understand that other shapes of through holes, such as non-circular or non-cylindrical through holes, can also be selected according to actual needs.

[0080] More specifically, the through channel can be formed by sequentially connecting an end cap through hole 111 located at the geometric center of the end cap 110, an elastic element through hole 131 located at the geometric center of at least one of the vibration isolation elastic elements, and a base through hole 121, preferably a light hole, located at the geometric center of the base 120. It should be noted that the through hole does not necessarily have to be located at the geometric center of all elements, but can also be located at a non-geometric center of one or more elements. Furthermore, the sequential connection referred to herein does not require that the elements fit tightly without any gaps, but only requires that they be geometrically smooth and continuous.

[0081] During installation, the end cap is pressed downwards. Four 0.5mm diameter through holes are located on one side of the end cap, and four sets of steel springs connect to the base, providing oblique support to the end cap. Initially, the steel springs are compressed, and their vertical component provides the restoring force of the end cap. When the vibration damper is not under load, the equipment tends to return to its original state.

[0082] This invention relates to a shock-resistant disc spring isolator for civil aircraft. The main body of the device is a cylindrical cavity, with an end cap at one end and the bottom of the cavity at the other. A bolt through hole is provided in the center of the cavity, and the cavity is pressed together by bolts and the end face of the single lug and the end face of the equipment bracket connection hole. This invention is small in size and light in weight, making it easy to install on the bracket equipment, and can effectively isolate vertical and lateral vibrations. To isolate the excitation at the landing gear, this invention addresses the transmission path, effectively preventing resonance and reducing the response at the landing gear equipment.

[0083] This device is used in accordance with the relevant requirements for airborne equipment impact and crash safety environment testing. The connection between the single-ear or double-ear structure and the equipment support, or the part with fastener connection, can be selected as the location for installing the vibration isolator.

[0084] The following is a brief description of the installation of a preferred embodiment of the vibration isolation device 100 according to the present invention on an aircraft.

[0085] The lower part of the base 120 is an ear plate platform or equipment support platform. The connecting bolt passes through the base through hole 121 in the middle of the base 120 and is connected to the aforementioned external platform by fasteners.

[0086] The base 120 has four uniform threaded grooves 123 inside along the circumferential direction. The depth of the threaded grooves 123 matches the end threaded section of the threaded center guide post 132.

[0087] The upper part of the end cap 110 is a lug platform or equipment support platform, and the lower part is closely attached to the rubber stack spring, and both are fitted onto the smooth rod section of the connecting bolt.

[0088] During installation, first select four suitable threaded center guide posts 132 and screw them into the four evenly distributed threaded grooves 123 on the bottom of the base 120. Then, according to the load and allowable displacement of the equipment, select the number of mating disc spring sets and fit them onto the threaded center guide posts 132. The disc springs are installed in mating configurations, in groups of 4-6, to reduce vertical displacement. A flat washer of the same size can be fitted to the upper end of each disc spring set, making the force on each set more even. The rubber stack spring has a round hole at its bottom, which fits onto the corresponding center guide post 132 and presses against the corresponding disc spring assembly (or flat washer).

[0089] Then, the end cap 110 is passed through the connecting bolt and pressed onto the rubber stack spring.

[0090] Finally, since the base 120 and the end cap 110 both have four through holes with a diameter of 0.5mm along the circumferential direction, four sets of tension springs 130C are used to connect the base 120 and the end cap 110.

[0091] In summary, the preferred embodiment of the vibration isolation device 100 of the present invention employs a triple vibration isolation design. The rubber stack spring cooperating with the base 120 serves as the first-stage vibration isolation device. Utilizing the high stiffness and small displacement characteristics of the mating disc springs, the threaded guide post and the mating disc springs form the second-stage vibration isolation device. Furthermore, the four sets of tension steel springs connecting the end cap 110 and the base 120 serve as the third-stage vibration isolation device and can provide restoring force. This vibration isolation device 100 has at least the following advantages:

[0092] 1) The vibration isolation device features a baseless design with a central through-hole for bolts to pass through. It is small in size, lightweight, and easy to install. During installation, the bolts pass directly through the bare bolt section, facilitating installation and use.

[0093] 2) This vibration isolation device is designed with flexible support, unlike traditional reinforced designs. When the aircraft is subjected to impact loads, the three-stage vibration isolation device of the structure will move relative to the base, generating small displacements, reducing the impact of acceleration impacts on the equipment, thus playing a buffering role. Compared with traditional disc spring vibration isolators, this invention, due to its three-stage vibration isolation device, has smaller dynamic displacements relative to the landing gear platform and single-ear structure, meeting the operational requirements of the equipment. This vibration isolation device, with its three-stage design, can significantly reduce the impact of impact loads on structures such as civil aircraft landing gear that frequently bear high-value impact loads, thereby improving the flight safety performance of civil aircraft. The three-stage vibration isolation device used in this invention includes threaded guide posts and mating springs, rubber stack springs that cooperate with the base, and four sets of steel springs connecting the end cap and the base. It has a better vibration isolation effect when facing high-value loads.

[0094] 3) This invention incorporates a first-stage vibration isolation device within the base, achieving both lateral and yaw vibration isolation through a mating rubber spring. This invention achieves three-dimensional vibration isolation through an integrated cavity structure and internally integrated components, requiring fewer internally installed and mating devices.

[0095] 4) By changing the length of the threaded guide post at the base and the number of mating disc springs, this invention can control the dynamic displacement of the structure and the vibration isolation effect that can be achieved.

[0096] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0097] In light of the detailed description above, these and other changes can be made to the embodiments described herein.

[0098] Generally, the terms used in the claims should not be considered as limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

Claims

1. A vibration isolation device (100) for installation at a bolted structure of an aircraft landing gear. include: End cap (110), said end cap (110) is arranged at the first end of the vibration isolation device (100); A base (120) is arranged at the second end of the vibration isolation device (100) opposite to the first end; A vibration-damping elastic element is disposed between the end cap (110) and the base (120). Its features are, After the end cap (110), the base (120), and the vibration-damping elastic element are assembled, a through channel is formed between the first end and the second end, vertically arranged through the end cap (110), the vibration-damping elastic element, and the base (120) in sequence. The through channel is in the form of a cylindrical through hole for the bolt structure to pass through. The base (120) includes a cavity (122) at one end near the end cap (110), and the bottom of the cavity (122) is provided with a plurality of grooves (123). The vibration-damping elastic element includes tension springs (130C) supported between the end cap (110) and the base (120) respectively, providing restoring force, wherein the component of the restoring force in the vertical direction is always greater than zero. The vibration-damping elastic element also includes a first-stage spring (130A) disposed in the cavity (122) and a second-stage spring (130B) disposed in the groove (123). The first-stage spring (130A) and the second-stage spring (130B) are connected to each other at their ends. The other end of the first-stage spring (130A) is connected to the end cap (110), and the other end of the second-stage spring (130B) is connected to the base (120). The second-stage spring (130B) includes multiple springs arranged in a central position. Disc springs are fitted onto their respective central guide posts (132). The bottom of the first-stage spring (130A) and the bottom of the groove (123) are respectively provided with central guide post receiving holes to accommodate the corresponding central guide posts (132), so as to set different lengths of the central guide posts and different numbers of disc springs by replacing different central guide posts, and to control the dynamic displacement of the structure and the vibration isolation effect that can be achieved. The first-stage spring (130A) is a rubber stack spring whose shape matches the cavity (122). The outer side of the rubber stack spring is close to the inner wall of the base (120) to achieve lateral and directional vibration isolation at the same time. The second-stage spring (130B) also includes a flat pad set at the end of each disc spring near the first-stage spring (130A).

2. The vibration isolation device (100) according to claim 1. Its features are, The through channel is formed by the sequential connection of an end cap through hole (111) located at the geometric center of the end cap (110), an elastic element through hole (131) located at the geometric center of at least one of the vibration isolation elastic elements, and a base through hole (121) located at the geometric center of the base (120).

3. The vibration isolation device (100) according to claim 1. Its features are, The tension spring (130C) includes multiple sets of steel springs symmetrically distributed around the center of the vibration isolation device. The multiple sets of steel springs are connected to the end cap (110) and the base (120) respectively through corresponding spring mounting through holes opened on the edges of the end cap (110) and the base (120).

4. The vibration isolation device (100) according to claim 1. Its features are, The central guide post (132) has an external thread at one end inserted into the groove (123), and the bottom section of the groove (123) has an internal thread for screw fixing with the central guide post (132).

Images