An annular rubber shock absorber for an inertial navigation system

Abstract

An annular rubber shock absorber for an inertial navigation system belongs to the field of mechanical technology, and includes: a shock absorber outer ring, which is an annular structure; a shock absorber inner ring, which is located inside the shock absorber outer ring and cooperates with the shock absorber outer ring to realize the installation of the shock absorber and the inertial navigation product; a shock absorber mounting ring, which is fixedly connected to the bottom of the shock absorber inner ring, and the upper and lower parts of the product are fastened between the shock absorber mounting ring and the shock absorber inner ring through a bayonet structure to complete the integrated installation of the shock absorber and the product; a damping rubber material, which is located between the shock absorber inner ring and the shock absorber outer ring and is fixed as a whole; the fastening installation of the connected parts is realized through the shock absorber inner ring and the shock absorber mounting ring, and the product is assembled while the shock absorber is installed. The present invention solves the vibration reduction problem of the current miniaturized and low-cost inertial navigation system.

Description

Technical Field

[0001] The invention relates to an annular rubber vibration damper for an inertial navigation system, belonging to the technical field of machinery. Background Art

[0002] The rubber shock absorber uses the mechanical properties of polymer rubber viscoelastic materials to achieve the purpose of attenuating external high-frequency mechanical vibrations. Shock absorbers and vibration reduction systems are important components of inertial navigation systems. On the one hand, they are required to ensure the mechanical environment adaptability of the system, especially the inertial instrument; on the other hand, they need to ensure good performance such as stiffness in all directions so that the system has excellent dynamic performance.

[0003] At present, the commonly used vibration reduction system design scheme is to select multiple vibration absorbers and form a vibration reduction system according to certain configuration schemes and configuration rules. Mature configuration schemes include eight-point vibration reduction schemes in space, four-point vibration reduction schemes in space, and four-point vibration reduction schemes in plane, which are widely used in various inertial navigation products in the fields of aviation, transportation, aerospace, etc. The advantage of this vibration reduction system is that the vibration reduction efficiency is high and the system dynamic performance is good, but it also has the following two shortcomings:

[0004] First, the system needs to install each shock absorber separately before assembling the system. There are many assembly steps and many standard parts such as screws are required.

[0005] Second, to ensure the dynamic performance of the system, the stiffness and processing tolerance of each shock absorber need to be screened, and shock absorbers are mostly installed in pairs. This increases the process links and costs, and also means that when one shock absorber is damaged, multiple shock absorbers in the same group often need to be replaced, which increases the hardware cost. Summary of the invention

[0006] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide an annular rubber shock absorber for an inertial navigation system, and to solve the vibration reduction problem of the current miniaturized and low-cost inertial navigation system.

[0007] The technical solution of the present invention is: an annular rubber shock absorber for an inertial navigation system, comprising:

[0008] The outer ring of the shock absorber is a ring structure;

[0009] The shock absorber inner ring is located inside the shock absorber outer ring and cooperates with the shock absorber outer ring to realize the installation of the shock absorber and the inertial navigation product;

[0010] The shock absorber mounting ring is fixedly connected to the bottom of the shock absorber inner ring, and the shock absorber and the product are installed as one by fastening the upper and lower parts of the product between the shock absorber mounting ring and the shock absorber inner ring through the bayonet structure;

[0011] The damping rubber material is located between the inner ring of the shock absorber and the outer ring of the shock absorber and is fixed integrally therewith;

[0012] The connected parts are fastened and installed through the shock absorber inner ring and the shock absorber mounting ring, and the product is assembled while the shock absorber is installed.

[0013] Furthermore, the inner ring of the shock absorber is made of aluminum alloy material.

[0014] Furthermore, an annular fin structure is provided on the outer side of the inner ring of the shock absorber, which is used to adjust the cross-sectional shape and size of the damping rubber material to ensure the consistency of the isotropic stiffness of the shock absorber; the fin thickness t of the inner ring of the shock absorber is not less than 1 mm, and the fin height h and the shock absorber thickness T satisfy h<1 / 2T; the fin itself and the connection are chamfered.

[0015] Furthermore, a fine-pitch internal thread is provided on the inner side of the inner ring of the shock absorber, and a pitch P is less than 1 mm; a clamping ring interface is provided at one end of the inner side of the shock absorber inner ring for fastening the connected part, and at the same time, two circumferential positioning sockets at an angle of 170° to each other are provided on the clamping ring, which cooperate with the key design on the connected part to achieve circumferential positioning of the connected part.

[0016] Furthermore, the outer ring of the shock absorber is made of aluminum alloy material.

[0017] Furthermore, a trapezoidal annular groove structure is provided on the inner side of the outer ring of the shock absorber, which is used to adjust the cross-sectional shape and size of the damping rubber material to ensure the consistency of the isotropic stiffness of the shock absorber.

[0018] Furthermore, the outer ring of the shock absorber is provided with four through holes with a diameter of 4.5 mm, which serve as mounting holes for the inertial navigation system.

[0019] Furthermore, the four sides of the outer ring of the shock absorber are orthogonally chamfered, and one plane is used as an azimuth support surface; the outer surface of the outer ring is hard-oxidized.

[0020] Furthermore, the cross-sectional shape of the damping rubber material has deep groove structures designed on both upper and lower end surfaces, except for the vulcanized bonding parts on the inner and outer sides respectively to the shock absorber inner ring and the shock absorber outer ring, and the groove depth d and the groove width w satisfy d>2w.

[0021] Furthermore, the shock absorber mounting ring is made of aluminum alloy, and has a fine outer thread processed on the outer side, which cooperates with the inner thread on the shock absorber inner ring; three bayonet pins are provided on the shock absorber mounting ring for cooperating with the tooling to achieve threaded fastening.

[0022] The advantages of the present invention compared with the prior art are:

[0023] (1) The annular shock absorber of the present invention optimizes the damping rubber cross section through simulation iteration of the inner ring and outer ring structure design, achieving good consistency of stiffness in all directions. When the first-order linear vibration mode frequency of the structural shock absorber is 90Hz in the experimental test, the three-way frequency difference is within 5Hz, which meets the use requirements of medium and high precision inertial navigation systems and effectively guarantees the navigation performance of the system in a dynamic environment;

[0024] (2) The annular fin structure is added to the outer side of the inner ring of the annular shock absorber of the present invention, and the trapezoidal annular groove structure is added to the inner side of the outer ring to ensure the cross-sectional size of the damping rubber. The overall design of the structural parts is simple. The main parts are all rotary structures, which only require milling without electric punching, and the processing is simple, with fewer process flows and low processing costs.

[0025] (3) Using a ring-shaped shock absorber to replace the current shock absorption system composed of multiple shock absorbers avoids the problems of shock absorber selection and pairing;

[0026] (4) The annular vibration damper of the present invention not only completes the installation of the vibration damper, but also realizes the assembly of the inertial navigation product, without the need for screw fastening, making the overall installation simpler and more reliable. While saving the cost of raw materials, it also significantly simplifies the assembly process and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 It is a front view of the shock absorber of the present invention;

[0029] Figure 2 , 3 They are respectively a cross-sectional view of the shock absorber of the present invention and a schematic diagram of its installation;

[0030] Figure 4 , 5 They are respectively a schematic diagram of the structure of the inner ring of the shock absorber of the present invention and a cross-sectional diagram thereof;

[0031] Figure 6 , 7 They are respectively a schematic diagram of the structure of the outer ring of the shock absorber of the present invention and a cross-sectional view thereof;

[0032] Figure 8 , 9 They are respectively a schematic diagram of the structure of the damping rubber material of the present invention and a cross-sectional diagram thereof;

[0033] Fig.10 It is a schematic diagram of the structure of the vibration damper mounting ring of the present invention. DETAILED DESCRIPTION

[0034] In order to better understand the above technical scheme, the technical scheme of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical scheme of the present invention, rather than limitations on the technical scheme of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0035] The following is a further detailed description of an annular rubber vibration damper for an inertial navigation system provided by an embodiment of the present invention in conjunction with the accompanying drawings of the specification. The specific implementation method may include:

[0036] (1) The annular shock absorber consists of three structural parts: the shock absorber inner ring, outer ring and mounting ring. The inner and outer rings of the shock absorber are made of damping rubber material and are fixed together through a vulcanization process; the shock absorber mounting ring and the inner ring are both threaded and cooperate with each other to achieve the installation of the shock absorber and inertial navigation products;

[0037] (2) Through simulation iteration of the shock absorber inner and outer ring structural designs, the topological structure and dimensional details of the damping rubber cross section were optimized, and the consistency of the annular shock absorber's isotropic stiffness was achieved;

[0038] (3) An annular fin structure is added to the outer side of the inner ring of the shock absorber, and a trapezoidal annular groove structure is added to the inner side of the outer ring to ensure the cross-sectional size of the damping rubber;

[0039] (4) The shock absorber mounting ring is screwed to the inner ring through its own thread and installed. At the same time, the upper and lower parts of the product are fastened between the shock absorber mounting ring and the inner ring through the bayonet structure to complete the integrated installation of the shock absorber and the product.

[0040] In the solution provided in the embodiment of the present invention, the annular rubber vibration damper for an inertial navigation system is as follows: Figure 1 to Figure 3 As shown, the components include: a shock absorber inner ring 1, a shock absorber outer ring 2, a shock absorber mounting ring 3, and a damping rubber material 4. The shock absorber inner ring 1 and the shock absorber outer ring 2 are bonded together by the damping rubber material 4 through a vulcanization process.

[0041] The inner ring of the shock absorber and its cross section are as follows: Figure 4 , 5As shown, the inner ring is made of aluminum alloy, and the outer side is designed with an annular fin structure, which is used to adjust the cross-sectional shape and size of the damping rubber material to ensure the consistency of the isotropic stiffness of the shock absorber. The required fin thickness is: t≥1mm, and the fin height h and the shock absorber thickness T: h<1 / 2T. The fins themselves and the joints need to be rounded. The inner side of the inner ring is designed with a fine-pitch internal thread, and the pitch P is required to be less than 1mm, so that the thread has good self-locking ability. A clamping ring interface is designed at one end of the inner side of the inner ring for fastening the connected parts. At the same time, the clamping ring is designed with two circumferential positioning bayonet sockets at an angle of 170° to each other, which cooperate with the key design on the connected parts to achieve circumferential positioning of the connected parts.

[0042] The outer ring of the shock absorber and its cross section are as follows: Figure 6 , 7 As shown. The outer ring is made of aluminum alloy, and a trapezoidal ring groove structure is designed on the inside to adjust the cross-sectional shape and size of the damping rubber material to ensure the consistency of the isotropic stiffness of the shock absorber. The outer ring of the shock absorber is designed with four 4.5mm diameter through holes as the inertial navigation system installation holes. The four sides of the outer ring are orthogonally chamfered, and one of the planes is used as the azimuth support surface. The outer surface of the outer ring is hard-oxidized, making the surface more wear-resistant and corrosion-resistant.

[0043] The damping rubber material and its cross section are as follows Figure 8 , 9 As shown. The damping rubber material is a high-performance damping rubber material, and its cross-sectional shape has deep groove structures designed on both upper and lower end surfaces, except for the vulcanized bonding parts with the inner ring and the outer ring on the inner and outer sides, and the groove depth d and the groove width w are required to be: d>2w.

[0044] The vibration damper mounting ring is as follows Fig.10 As shown. The mounting ring is made of aluminum alloy, with fine external threads on the outside, which match the internal threads on the inner ring. The mounting ring is designed with three bayonet pins to achieve thread tightening with the tooling.

[0045] The schematic diagram of the installation of the annular rubber shock absorber for the inertial navigation system is as follows: Figure 2 , 3 As shown. The inner ring of the shock absorber and the mounting ring are used to achieve the fastening and mounting of the connected parts 1 and 2. That is, the product is assembled while the shock absorber is installed.

[0046] The present invention aims at the design problem of the vibration reduction system of the current miniaturized and low-cost inertial navigation system, and proposes a ring-shaped rubber vibration reduction device solution. The main technical problems solved include:

[0047] (1) The problem of inconsistent stiffness in all directions of the annular shock absorber itself is solved by optimizing the structural design. At the same time, the structural design is simple and the processing is easy, which reduces the hardware cost of the shock absorber.

[0048] (2) Using a ring-shaped shock absorber to replace the current shock absorption system composed of multiple shock absorbers avoids the problems of shock absorber selection and pairing;

[0049] (3) A new shock absorber assembly scheme is provided, which realizes the assembly of the whole machine at the same time by installing the shock absorber, significantly simplifies the installation of the vibration reduction system and the inertial navigation system, improves production efficiency, and eliminates standard parts such as installation screws.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0051] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. An annular rubber shock absorber for an inertial navigation system, characterized in that: include: The shock absorber outer ring (2) is a ring-shaped structure; The shock absorber inner ring (1) is located inside the shock absorber outer ring (2) and cooperates with the shock absorber outer ring (2) to realize the installation of the shock absorber and the inertial navigation product; The shock absorber mounting ring (3) is fixedly connected to the bottom of the shock absorber inner ring (1), and the upper and lower parts of the product are fastened between the shock absorber mounting ring (3) and the shock absorber inner ring (1) through a bayonet structure, thereby completing the integrated installation of the shock absorber and the product; The damping rubber material (4) is located between the shock absorber inner ring (1) and the shock absorber outer ring (2) and is fixed integrally therewith; The damper inner ring (1) and the damper mounting ring (3) are used to achieve the fastening and mounting of the connected parts, and the product is assembled while the damper is installed.

2. The annular rubber vibration damper for an inertial navigation system according to claim 1, characterized in that: The shock absorber inner ring (1) is made of aluminum alloy material.

3. The annular rubber shock absorber for an inertial navigation system according to claim 1, characterized in that: The outer side of the shock absorber inner ring (1) is provided with an annular fin structure for adjusting the cross-sectional shape and size of the damping rubber material to ensure the consistency of the isotropic stiffness of the shock absorber; the fin thickness t of the shock absorber inner ring (1) is not less than 1 mm, and the fin height h and the shock absorber thickness T satisfy h<1 / 2T; the fin itself and the connection are rounded.

4. The annular rubber vibration damper for an inertial navigation system according to claim 1, characterized in that: The inner side of the shock absorber inner ring (1) is provided with a fine pitch internal thread, and the pitch P is less than 1 mm; one end of the inner side of the shock absorber inner ring (1) is provided with a clamping ring interface for fastening the connected part, and at the same time, the clamping ring is provided with two circumferential positioning bayonet holes at an angle of 170° to each other, which cooperate with the key position design on the connected part to achieve circumferential positioning of the connected part.

5. The annular rubber vibration damper for an inertial navigation system according to claim 1, characterized in that: The shock absorber outer ring (2) is made of aluminum alloy material.

6. The annular rubber vibration damper for an inertial navigation system according to claim 1, characterized in that: The inner side of the shock absorber outer ring (2) is provided with a trapezoidal annular groove structure, which is used to adjust the cross-sectional shape and size of the damping rubber material (4) to ensure the consistency of the isotropic stiffness of the shock absorber.

7. The annular rubber vibration damper for an inertial navigation system according to claim 1, characterized in that: The shock absorber outer ring (2) is provided with four through holes with a diameter of 4.5 mm, which serve as inertial navigation system mounting holes.

8. The annular rubber vibration damper for an inertial navigation system according to claim 1, characterized in that: The four sides of the shock absorber outer ring (2) are orthogonally chamfered, with one plane serving as an orientation support surface; the outer surface of the outer ring is hard-oxidized.

9. The annular rubber vibration damper for an inertial navigation system according to claim 1, characterized in that: The cross-sectional shape of the damping rubber material (4) has deep groove structures designed on both upper and lower end surfaces, except for the portions on the inner and outer sides that are respectively vulcanized and bonded to the shock absorber inner ring (1) and the shock absorber outer ring (2), and the groove depth d and the groove width w satisfy d>2w.

10. The annular rubber vibration damper for an inertial navigation system according to claim 1, characterized in that: The shock absorber mounting ring (3) is made of aluminum alloy material, and is processed with fine-pitch external threads on the outer side, which cooperate with the internal threads on the shock absorber inner ring (1); the shock absorber mounting ring (3) is provided with three bayonet pins for cooperating with the tooling to achieve threaded fastening.

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