Anti-tearing half-bowl type silicon rubber shock absorber

Abstract

The anti-tearing half-bowl type silicon rubber shock absorber comprises an end mounting plate, a silicon rubber cushion block and an axial limiting rod, the silicon rubber cushion block is mounted in a center hole of the end mounting plate, and the axial limiting rod is mounted in a center hole of the silicon rubber cushion block. The end mounting plate is mounted on the inertia sensitive assembly or the load, the axial limiting rod is mounted on the outer shell or the supporting structure, and vibration isolation is conducted through the silicone rubber cushion block.

Description

Technical Field

[0001] This invention relates to a tear-resistant, half-bowl-shaped silicone rubber vibration damper, belonging to the field of vibration dampers. Background Technology

[0002] Silicone rubber vibration dampers are commonly used isolation devices in strapdown inertial navigation systems (INS) and are key components of inertial sensitive modules, directly affecting their dynamic characteristics. The most common structure for silicone rubber vibration dampers is the double-sided drum type, which occupies a large space. To further reduce the size of the inertial sensitive module, single-sided drum type vibration dampers are used. However, due to the uneven force distribution in single-sided drum type vibration dampers, problems such as rubber bonding surface cracking and changes in support stiffness may occur under harsh mechanical testing conditions. Therefore, these vibration dampers have limitations in engineering applications. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a small-sized silicone rubber vibration damper with strong adaptability to mechanical environment.

[0004] The technical solution adopted in this invention is: a tear-resistant half-bowl-shaped silicone rubber vibration damper, including an end mounting plate, a silicone rubber pad, and an axial limiting rod. The silicone rubber pad is installed in the center hole of the end mounting plate, and the axial limiting rod is installed in the center hole of the silicone rubber pad. The end mounting plate is installed on an inertial sensitive component or load, and the axial limiting rod is installed on an outer shell or support structure. Vibration isolation is achieved through the silicone rubber pad.

[0005] Furthermore, the end mounting plate and the silicone rubber pad, and the axial limiting rod and the silicone rubber pad are connected by adhesive bonding.

[0006] Furthermore, the end mounting plate is a cylindrical structure with mounting lugs on both sides. The cylindrical structure has a central hole, which includes a stepped hole at one end, a conical hole in the middle, and a cylindrical hole at the other end. The sidewall of the conical hole in the middle forms a lateral limiting slope.

[0007] Furthermore, the cone angle of the lateral limiting ramp is the same as the cone angle of the axial limiting rod, and the cone angle of the lateral limiting ramp is not less than 35°.

[0008] Furthermore, the lateral limiting slope is provided with several axial adhesive holes around the central axis.

[0009] Furthermore, the diameter of the axial adhesive holes is not less than 1 mm, and the number of symmetrically distributed holes is not less than 12.

[0010] Furthermore, the axial limiting rod has a frustum structure, and a cross-shaped groove is opened at the small end of the axial limiting rod to form a radial groove.

[0011] Furthermore, the depth of the radioactive trench is not less than 3 mm, and the width of the trench is not less than 1 mm.

[0012] Furthermore, the profile of the central hole of the silicone rubber pad matches the conical surface and radial groove of the axial limiting rod, the outer wall surface of the silicone rubber pad matches the central hole of the end mounting plate, and the small end of the silicone rubber pad is provided with a flange structure. When the silicone rubber pad is installed in the end mounting plate, the flange structure extends from the central hole of the end mounting plate and covers the port of the central hole of the end mounting plate.

[0013] Furthermore, the design dimensions for limiting displacement in all directions shall not exceed 60% of the design dimensions of the main body of the rubber compound.

[0014] The advantages of this invention compared to the prior art are:

[0015] (1) The present invention adopts a semi-bowl-shaped structure, which effectively reduces the size of the vibration damper and improves the space utilization rate; the present invention adopts a tear-resistant structure design, which effectively improves the mechanical environment adaptability and load-bearing capacity; the present invention adopts a semi-bowl-shaped structure, and when subjected to a large impact, the stiffness will increase with the displacement, effectively limiting large displacement and protecting the equipment.

[0016] (2) The tear-resistant half-bowl-shaped silicone rubber vibration damper of the present invention releases the inner space of the vibration damper through a single-sided drum-shaped structure design, thereby reducing the space used by the vibration damper and thus reducing the overall size of the inertial sensitive component.

[0017] (3) This invention utilizes finite element topology simulation analysis of the semi-bowl silicone rubber vibration damper. It adds injection holes to the end mounting plate to increase the bonding area, designs radial silicone rubber grooves at the bottom of the axial limiting rod to disperse stress concentration, optimizes the axial limiting rod structure, and increases the injection area of ​​the adhesive, ensuring that the adhesive layer thickness does not decrease significantly from top to bottom, thus avoiding stress concentration caused by abrupt changes in adhesive layer thickness. A boss is provided at the bowl opening to prevent damage to the adhesive layer during installation. This vibration damper structure is small in size, highly adaptable to mechanical environments, and can withstand large loads. Attached Figure Description

[0018] Figure 1 This is a simplified diagram of the mechanism of the present invention;

[0019] Figure 2 This is a schematic diagram of the end mounting plate structure;

[0020] Figure 3 This is a schematic diagram of a silicone rubber structure;

[0021] Figure 4 This is a schematic diagram of the axial limiting rod structure;

[0022] Figure 5 This is a diagram showing the location of a single-sided protruding structure.

[0023] Figure 6 The image shows the finite element simulation results. Detailed Implementation

[0024] The present invention will be described in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown, the tear-resistant half-bowl-shaped silicone rubber vibration damper of the present invention includes an end mounting plate 1, a silicone rubber pad 2, and an axial limiting rod 3. The end mounting plate 1 and the axial limiting rod 3 are connected to the silicone rubber pad 2 by adhesive bonding. The end mounting plate 1 is installed on an inertial sensitive component or load, and the axial limiting rod 3 is installed on an outer shell or support structure. Vibration isolation is achieved through the silicone rubber pad 2.

[0026] To reduce the external dimensions of the vibration damper and provide nonlinear support stiffness, a lateral limiting ramp is added to the end mounting plate. The ramp should have the same cone angle as the axial limiting rod and should be no less than 35°. See [link / details]. Figure 3 The silicone rubber pad 2 and the axial limiting rod 3 are designed for only one direction, see Figure 1 ;

[0027] To ensure the bonding strength between the end mounting plate 1 and the silicone rubber pad 2, axial adhesive holes are added to the end mounting plate 1. The diameter of the adhesive holes should be no less than 1 mm, and the number of symmetrically distributed holes should be no less than 12, thereby increasing the bonding area between the end mounting plate 1 and the silicone rubber pad 2. See [link / details]. Figure 2 ;

[0028] To ensure the bonding strength between the axial limiting rod 3 and the bottom of the silicone rubber pad 2, radial silicone rubber grooves are added to the axial limiting rod 3 to reduce stress concentration. The depth of the radial grooves should be no less than 3 mm, and the groove width should be no less than 1 mm. See [link to relevant documentation]. Figure 4 ;

[0029] To ensure the bonding strength of the silicone rubber flange, a single-sided raised silicone rubber structure 7 is used to guarantee the bonding area at the main stress points of the rubber compound, see [link to details]. Figure 5 The design dimensions for limiting displacement in each direction should not exceed 60% of the design dimensions of the main body of the rubber compound. For example, if the displacement limiting dimension is 3mm, then the design dimensions of the main body of the rubber compound should not exceed 5mm.

[0030] To verify the rationality of the above design, strength calculations can be performed using finite element simulation. By comparing the simulation results for each measure, the strength of the adhesive bonding area can be checked to see if it meets the design requirements. Figure 6 The maximum stress at the adhesive bonding joint decreased from 2.7 MPa to 0.8 MPa, which is below the allowable bond strength of 1.6 MPa, meeting the requirements.

[0031] Design requirements.

[0032] The parts of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A tear resistant half-bowl type silicone rubber damper, characterized by, It comprises an end mounting plate (1), a silicone rubber pad (2) and an axial limiting rod (3), the silicone rubber pad (2) is installed in the center hole of the end mounting plate (1), the axial limiting rod (3) is installed in the center hole of the silicone rubber pad (2), the end mounting plate (1) is installed on an inertial sensitive assembly or a load, the axial limiting rod (3) is installed on an external shell or a support structure, and the vibration isolation is realized through the silicone rubber pad (2).

2. A tear resistant half-bellows type of silicone rubber damper according to claim 1, characterized in that The end mounting plate (1) and the silicone rubber pad (2) and the axial limiting rod (3) and the silicone rubber pad (2) are connected through cementation.

3. A tear resistant half-bellows type of silicone rubber damper as defined in claim 1, wherein The end mounting plate (1) is a cylindrical structure, both sides are provided with mounting lugs, the cylindrical structure is provided with a center hole, the center hole comprises a stepped hole at one end, a conical hole in the middle and a cylindrical hole at the other end, and the side wall of the conical hole in the middle forms a lateral limiting slope (4).

4. The tear resistant half-bellows type silicone rubber damper according to claim 1, wherein The taper angle of the lateral limiting slope (4) is the same as that of the axial limiting rod (3), and the taper angle of the lateral limiting slope (4) is not less than 35°.

5. A tear resistant half-bellows type of silicone rubber damper according to claim 4, wherein A plurality of axial glue holes (5) are arranged on the lateral limiting slope (4) around the central axis.

6. A tear resistant half-bellows type of silicone rubber damper according to claim 5, wherein The diameter of the axial glue hole (5) is not less than 1mm, and the number of symmetrically distributed holes is not less than 12.

7. A tear resistant half-bellows type of silicone rubber damper according to claim 6, wherein The axial limiting rod (3) is a frustum structure, a cross-shaped groove is formed on the small end of the axial limiting rod (3), and a radioactive groove (6) is formed.

8. A tear resistant half-bellows type of silicone rubber damper according to claim 7, characterized in that The depth of the radioactive groove (6) is not less than 3mm, and the groove width is not less than 1mm.

9. A tear resistant half-bellows type of silicone rubber damper according to claim 8, characterized in that The profile of the center hole of the silicone rubber pad (2) is matched with the taper surface and the radioactive groove (6) of the axial limiting rod (3), the outer wall surface of the silicone rubber pad (2) is matched with the center hole of the end mounting plate (1), the small end of the silicone rubber pad (2) is provided with a flange structure, and when the silicone rubber pad (2) is installed in the end mounting plate (1), the flange structure protrudes from the center hole of the end mounting plate (1) to cover the port of the center hole of the end mounting plate (1).

10. A tear resistant half-bellows type of silicone rubber damper according to claim 9, wherein The design size of each direction displacement limitation is not more than 60% of the design size of the main body of the rubber.

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