Isolated shock-mounted inertial measurement package

Abstract

The application provides an isolated shock-absorbing type inertial measurement assembly, and belongs to the technical field of damping shock absorption. The assembly comprises a shell, a mass block, a mounting ring and a damping cavity. The mass block is arranged in the shell and has a freedom degree of movement along the height direction of the shell. The mounting ring is slidably sleeved on the outer side of the mass block, a sensor is fixed on the mounting ring, and the sliding direction of the mounting ring is parallel to the movement direction of the mass block. The damping cavity is a deformable material part, one end of which extends to the space between the shell and the mass block, and the other end extends to one side of the mounting ring. When external vibration is transmitted to the assembly, the mass block moves along the height direction of the shell and extrudes the damping cavity before the mounting ring, the damping cavity deforms and extrudes the mounting ring in the opposite direction, and the mounting ring is more difficult to change the movement of the mass block through the damping cavity, so the speed of kinetic energy reduction is faster. The application can quickly and directly reduce the kinetic energy of the mounting ring, avoids the reciprocating oscillation of the mounting ring in a small range, and improves the stability of the sensor.

Description

Technical Field

[0001] This invention belongs to the field of damping and vibration reduction technology, and more specifically, relates to an isolated vibration-damping inertial measurement unit. Background Technology

[0002] Inertial measurement units (IMUs) are core instruments for measuring the attitude angles and acceleration of a vehicle, and are widely used in vehicle navigation, UAV flight control, missile navigation, and robot control. The core sensors of an IMU are gyroscopes and accelerometers, which are highly sensitive to vibration and shock. When external vibrations exceed the sensor's measurement range, they will severely affect measurement accuracy and may even cause sensor failure. To ensure the normal operation of the IMU under vibration and shock environments, a vibration damping structure is usually installed inside the unit to isolate external vibrations from being transmitted to the sensors.

[0003] Existing inertial measurement unit (IMU) vibration damping structures typically employ elastic pads to directly support or clamp the sensor and its mounting base, absorbing vibration energy through the compression and deformation of the elastic material. However, the resistance provided by either the elastic body or the elastic pad varies linearly with its own deformation. If the external impact is significant, even with the elastic material providing some resistance, the sensor still needs to repeatedly move up and down before its kinetic energy reaches zero. This linear restoring force characteristic causes the damping system to exhibit typical underdamped oscillations under large impacts. Therefore, the sensor often requires a certain period of oscillation before stabilizing, resulting in poor damping performance and low sensor stability. Summary of the Invention

[0004] The purpose of this invention is to provide an isolated and vibration-damping inertial measurement unit, which aims to solve the problems of requiring reciprocating oscillations to reduce kinetic energy, poor vibration damping effect, and poor sensor stability.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an isolated and vibration-damping inertial measurement unit, comprising: Casing; the height direction of the casing is defined as the vertical direction; A mass block is disposed inside the outer shell and has a degree of freedom to move along the height direction of the outer shell; A mounting ring is slidably fitted onto the outside of the mass block, and a sensor is fixed on the mounting ring; the sliding direction of the mounting ring is parallel to the movement direction of the mass block. The damping cavity extends at one end between the outer shell and the mass block, and at the other end to one side of the mounting ring; the damping cavity is made of a deformable material. The mass block presses the damping cavity before the mounting ring, causing the damping cavity to press the mounting ring in the opposite direction, thereby reducing the kinetic energy of the mounting ring.

[0006] In one possible implementation, the damping cavity has an inner cavity; and the damping cavity has a recess at one end near the mounting ring, the recess extending from the end of the damping cavity toward the side away from the mounting ring; when the pressure in the inner cavity increases, the recess deforms and is used to squeeze the mounting ring.

[0007] In one possible implementation, the damping cavity is distributed on both sides of the mass block and the mounting ring.

[0008] In one possible implementation, the outer wall of the mass block has a groove that slides in conjunction with the mounting ring.

[0009] In one possible implementation, when the housing is stationary, trigger gaps are provided between the mass block and the damping cavity, as well as between the mounting ring and the damping cavity.

[0010] In one possible implementation, the inner wall of the housing is provided with a support base, and an elastic element is connected between the support base and the mounting ring.

[0011] In one possible implementation, one end of the damping cavity passes through the support and is disposed inside the elastic member.

[0012] In one possible implementation, the inner wall of the outer shell is provided with a limiting ring, and a connecting ring that slides with the limiting ring is fixed on the mass block. The limiting ring and the connecting ring cooperate to allow the mass block to have only one degree of freedom of movement along the height direction of the outer shell.

[0013] In one possible implementation, the support base has a clearance hole to avoid the damping cavity, and one side of the damping cavity is attached to the clearance hole; the limiting ring abuts against the outer wall of the other side of the damping cavity, and the clearance hole and the limiting ring are used together to limit the deformation direction of the damping cavity.

[0014] In one possible implementation, the upper and lower sides of the outer shell are detachably connected to a cover, and an elastic body connects the cover to the mass block.

[0015] The beneficial effects of the isolation and vibration damping inertial measurement unit provided by this invention are as follows: Compared with the prior art, in this invention, the mass block is located inside the outer shell and has the freedom to move along the height direction of the outer shell. A mounting ring is slidably fitted onto the outside of the mass block, and a sensor is fixed on the mounting ring. The sliding direction of the mounting ring is parallel to the movement direction of the mass block. The damping cavity is made of deformable material, with one end extending between the outer shell and the mass block, and the other end extending to one side of the mounting ring. When external vibration is transmitted to the assembly, the mass block moves along the height direction of the outer shell and presses against the damping cavity before the mounting ring. The damping cavity deforms and presses against the mounting ring in the opposite direction. Furthermore, the mounting ring has difficulty changing the movement of the mass block through the damping cavity, thus reducing kinetic energy more quickly. This application can quickly and directly reduce the kinetic energy of the mounting ring, avoiding small-range reciprocating oscillations of the mounting ring and improving the stability of the sensor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the isolation and shock absorption inertial measurement unit in a static state provided in Embodiment 1 of the present invention; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle; Figure 3 This is a schematic diagram of the structure of the isolation and shock absorption inertial measurement assembly for extrusion installation in the recessed portion, provided in Embodiment 2 of the present invention. Figure 4 for Figure 3 A magnified view of a portion of point B in the middle; Figure 5 This is a schematic diagram of the structure of the damping cavity provided in an embodiment of the present invention.

[0018] In the diagram: 1. Outer shell; 2. Mass block; 3. Damping cavity; 4. Support base; 5. Cover; 6. Inner cavity; 7. Connecting ring; 8. Limiting ring; 9. Sensor; 10. Recess; 11. Elastic element; 12. Mounting ring; 13. Elastomer. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0020] Please refer to the following: Figures 1 to 5 The isolation and damping inertial measurement unit (IMU) provided by this invention will now be described. The Isolation and Damping Inertial Measurement Unit includes: a housing 1, a mass block 2, a mounting ring 12, and a damping cavity 3. The housing 1 is configured with its height direction as vertical. The mass block 2 is disposed within the housing 1 and has the freedom to move along the height direction of the housing 1. The mounting ring 12 is slidably fitted onto the outside of the mass block 2, and a sensor 9 is fixed to the mounting ring 12; the sliding direction of the mounting ring 12 is parallel to the movement direction of the mass block 2. One end of the damping cavity 3 extends between the housing 1 and the mass block 2, and the other end extends to one side of the mounting ring 12; the damping cavity 3 is made of a deformable material. The mass block 2 presses against the damping cavity 3 before the mounting ring 12, causing the damping cavity 3 to press against the mounting ring 12 in the opposite direction to reduce the kinetic energy of the mounting ring 12.

[0021] The beneficial effects of the isolation and vibration damping inertial measurement unit provided by this invention are as follows: Compared with the prior art, in the isolation and vibration damping inertial measurement unit of this invention, the mass block 2 is disposed inside the outer shell 1 and has the degree of freedom to move along the height direction of the outer shell 1. The mounting ring 12 is slidably sleeved on the outside of the mass block 2, and the sensor 9 is fixed on the mounting ring 12, and the sliding direction of the mounting ring 12 is parallel to the movement direction of the mass block 2. The damping cavity 3 is made of deformable material, with one end extending between the outer shell 1 and the mass block 2, and the other end extending to one side of the mounting ring 12. When external vibration is transmitted to the component, the mass block 2 moves along the height direction of the outer shell 1 and squeezes the damping cavity 3 before the mounting ring 12, and the damping cavity 3 deforms and squeezes the mounting ring 12 in the opposite direction. This application utilizes the deformation of the damping cavity 3 to absorb part of the kinetic energy of the mounting ring 12, reduces the frequency of the mounting ring 12's reciprocating motion in a small range, and improves the stability of the sensor 9.

[0022] In the single elastic body 13 damping structure, the sensor 9 mounting base is directly connected to the elastic element. When external vibration is transmitted, the elastic element and the sensor 9 mounting base respond synchronously, lacking a buffer time difference. The impact energy is concentrated on the sensor 9 in a very short time, resulting in limited damping effect.

[0023] In this design, when external vibration is transmitted to the component, mass block 2 compresses the damping cavity 3 before mounting ring 12. After the damping cavity 3 deforms under pressure, it then compresses the mounting ring 12 in the opposite direction. This sequence of "mass block 2 moving first → compressing the damping cavity 3 → the damping cavity 3 deforming and storing energy → pushing the mounting ring 12 in the opposite direction" effectively provides a "pre-buffering" time window for the mounting ring 12. Mass block 2, as an independent inertial body, moves first and actively compresses the damping cavity 3, converting the impact energy into the internal energy of the damping cavity 3 material and the thermal energy of the fluid in the inner cavity 6. After the damping cavity 3 has completed energy absorption, it then acts on the mounting ring 12 with a relatively gentle force. This is equivalent to inserting a "buffer converter" in the vibration energy transmission path, significantly reducing the impact intensity borne by the mounting ring 12.

[0024] In the single elastic body 13 damping structure, the elastic element usually passively supports or clamps the mounting base. The force it generates mainly acts on the mounting base in the opposite direction of vibration transmission. It belongs to "passive resistance" damping. There is a reaction force only when there is vibration. The energy dissipation efficiency is limited by the self-recovery characteristics of the elastic material.

[0025] In this design, the damping cavity 3 deforms under the pressure of the mass block 2, increasing the pressure within its inner cavity 6. This pressure drives the recessed portion 10 to expand outward, pressing against the mounting ring 12. The direction of this reverse pressing force is opposite to the direction of movement of the mounting ring 12, effectively applying an "active braking" damping force to it. More importantly, this damping force is generated by the pressure within the inner cavity 6, exhibiting rapid response and controllable force. When the inner cavity 6 is filled with fluid, the viscous flow of the fluid further enhances the energy dissipation efficiency, rapidly suppressing the kinetic energy of the mounting ring 12.

[0026] Please refer to some embodiments of the isolation and vibration damping inertial measurement unit provided in this application. Figures 1 to 4 The damping cavity 3 has an inner cavity 6; and the damping cavity 3 has a recess 10 at one end near the mounting ring 12. The recess 10 extends from the end of the damping cavity 3 to the side away from the mounting ring 12. When the pressure in the inner cavity 6 increases, the recess 10 deforms and is used to squeeze the mounting ring 12.

[0027] Specifically, the inner cavity 6 is a sealed cavity inside the damping cavity 3, which can be filled with air or high-viscosity damping oil. The recessed portion 10 is a thin, elastic wall structure with an inwardly recessed end of the damping cavity 3, which is normally in an inward-facing state. During operation, the mass block 2 is subjected to vibration and compresses the outer surface of the damping cavity 3, causing the volume of the inner cavity 6 to decrease and the internal pressure to increase sharply. The pressure acts on the inner wall of the recessed portion 10, causing the originally concave portion 10 to bulge and deform towards the mounting ring 12, thereby abutting and pushing the mounting ring 12 and transmitting the damping force in the opposite direction to the mounting ring 12. This structure utilizes the pressure change in the sealed cavity to achieve force reversal and amplification, and uses the mass block 2 to reduce the kinetic energy of the mounting ring 12.

[0028] The damping cavity 3 can be made of fatigue-resistant, highly airtight butyl rubber or thermoplastic polyurethane elastomer 13. The recessed portion 10 can be thinned to ensure deformation sensitivity, while the remaining parts maintain their thickness to preserve structural strength. Damping force can be quickly established under micro-amplitude vibrations, making the damping intervention process smoother, effectively absorbing high-frequency micro-amplitude vibrations, further reducing disturbances to the sensor 9, and improving measurement stability.

[0029] In some embodiments of the isolated and damped inertial measurement unit provided in this application, please refer to... Figure 1 , Figure 3 and Figure 4 The damping cavity 3 is distributed on both sides of the mass block 2 and the mounting ring 12.

[0030] The damping cavities 3 are symmetrically arranged on the upper and lower sides of the mass block 2 and the mounting ring 12, with identical structure, dimensions, and installation parameters on both sides. During operation, when the mass block 2 moves axially, it compresses the damping cavity 3 on one side, causing multiple damping cavities 3 on that side to deform synchronously and exert equal and consistent damping forces in the opposite direction on the mounting ring 12. This symmetrical arrangement follows the principle of force balance, ensuring uniform circumferential force on the mounting ring 12 and preventing tilting or jamming of the mounting ring 12 caused by unilateral force, thus guaranteeing the coaxiality of the sliding fit.

[0031] The purpose of the above design is to reduce the kinetic energy of the mounting ring 12 through the damping cavity 3, regardless of whether the mass block 2 moves upward or downward, thereby further improving the stability of the mounting ring 12 and the sensor 9 based on only setting the elastic element 11, such as the rubber sleeve.

[0032] In some embodiments of the isolated and damped inertial measurement unit provided in this application, please refer to... Figure 1 , Figure 3 and Figure 4 The outer wall of mass block 2 has a groove that slides in conjunction with mounting ring 12.

[0033] The groove is opened along the height direction of the mass block 2, and the groove shape is rectangular or dovetail. The side wall of the mounting ring 12 is provided with a corresponding protruding rib structure embedded in the groove. The protruding rib and the groove are fitted with a clearance to form a sliding pair. During operation, the mounting ring 12 reciprocates under the combined action of damping force and elastic restoring force. The groove constrains the movement trajectory of the protruding rib throughout the entire process, so that the mounting ring 12 can only slide in a straight line along the extension direction of the groove, restricting its radial movement and circumferential torsion.

[0034] This structure achieves high-precision motion constraints with a simple design through a guide form that uses a groove and ridge combination. The surface of the groove can be hard anodized or coated with a self-lubricating coating. The protruding ridge of the mounting ring 12 can be made of self-lubricating materials such as polytetrafluoroethylene (PTFE) to reduce the coefficient of sliding friction and minimize wear. This structure significantly improves the linearity and guiding accuracy of the mounting ring 12, avoids measurement reference deviations of the sensor 9 caused by the attitude offset of the mounting ring 12, and ensures measurement accuracy.

[0035] In some embodiments of the isolated and damped inertial measurement unit provided in this application, please refer to... Figure 1 When the outer shell 1 is stationary, there are trigger gaps between the mass block 2 and the damping cavity 3, and between the mounting ring 12 and the damping cavity 3.

[0036] In the static equilibrium state, a small gap of a predetermined width is reserved between the pressing end face of the mass block 2 and the corresponding end face of the damping cavity 3, and between the corresponding end face of the mounting ring 12 and the acting end face of the damping cavity 3. The width of this gap can be designed and adjusted according to the target damping threshold. During operation, when the external vibration amplitude is less than the trigger gap width, the mass block 2 moves freely within the gap range and does not contact the damping cavity 3. The damping mechanism does not intervene, and the sensor 9 maintains a highly sensitive static measurement state. When the vibration amplitude exceeds the gap width, the mass block 2 will contact and press the damping cavity 3, triggering the damping damping effect. This structure achieves a threshold-based damping triggering mechanism through gap setting, using mechanical gaps to filter out the small amplitude vibrations commonly present in the environment, avoiding frequent micro-movements of the damping mechanism from interfering with the sensor 9. Its beneficial effect is that it balances the static measurement accuracy and dynamic vibration resistance performance of the sensor 9, ensuring measurement sensitivity under small amplitude interference and providing effective damping protection under large amplitude impact.

[0037] In the single elastic body 13 damping structure, the elastic element is always in working condition. Even small-amplitude normal vibrations will be partially absorbed by the elastic element, which will reduce the sensitivity of the sensor 9 to small attitude changes and affect the measurement accuracy.

[0038] In this design, trigger gaps are provided between the mass block 2 and the damping cavity 3, and between the mounting ring 12 and the damping cavity 3, when the external vibration amplitude is small. When the external vibration amplitude is small, the displacement of the mass block 2 is insufficient to eliminate the gap, the damping cavity 3 does not participate in the operation, and the sensor 9 on the mounting ring 12 can freely respond to minute attitude changes, ensuring measurement sensitivity. However, when a strong vibration or impact occurs, the displacement of the mass block 2 increases, first eliminating the gap and squeezing the damping cavity 3, and then the damping cavity 3 reverses and squeezes the mounting ring 12, achieving active suppression of large-amplitude vibrations. This adaptive mechanism of "intervention on demand" balances measurement accuracy and vibration reduction effect, which cannot be achieved by the single elastic body 13 design.

[0039] In some embodiments of the isolated and damped inertial measurement unit provided in this application, please refer to... Figure 1 , Figure 3 and Figure 4 The inner wall of the outer shell 1 is provided with a support seat 4, and an elastic element 11 is connected between the support seat 4 and the mounting ring 12.

[0040] The support base 4 is fixed to the inner wall of the outer shell 1, serving as a fixed support base. The elastic element 11 is an elastic energy storage element arranged vertically, with its two ends connected to the side of the support base 4 and the corresponding end face of the mounting ring 12, respectively. During operation, the mounting ring 12 undergoes axial displacement due to inertia, and the elastic element 11 is stretched or compressed accordingly. On the one hand, it converts some of the vibration energy into elastic potential energy; on the other hand, it cooperates with the damping cavity 3 to form a damping-elastic body 13 damping system, jointly consuming the kinetic energy of the mounting ring 12.

[0041] After the vibration disappears, the elastic element 11 releases its elastic potential energy, causing the mounting ring 12 to return to its initial equilibrium position. This structure is based on the principle of passive damping, using the elastic element 11 to provide a restoring force and auxiliary damping effect, complementing the energy dissipation effect of the damping cavity 3. The elastic element 11 can be a stainless steel cylindrical helical spring, which has excellent fatigue resistance; a disc spring can also be used depending on space requirements; or materials with a certain degree of elastic deformation, such as rubber, can be used. Currently, organic materials with deformation capabilities are commonly used to absorb the kinetic energy of the mounting ring 12. The support base 4 is made of aluminum alloy, balancing strength and lightweight. This design provides a stable restoring reference for the mounting ring 12, effectively preventing zero-point drift of the sensor 9; the elastic element 11 and the damping cavity 3 work together to form a second-order damping system, broadening the effective damping frequency range and providing good suppression of vibrations in different frequency bands.

[0042] In some embodiments of the isolated and damped inertial measurement unit provided in this application, please refer to... Figure 1 , Figure 3 and Figure 4 One end of the damping cavity 3 passes through the support seat 4 and is installed inside the elastic member 11.

[0043] One end of the damping cavity 3, near the mounting ring 12, passes through the opening on the support base 4 and extends into the annular space inside the elastic element 11. The elastic element 11 is coaxially fitted onto the outside of the damping cavity 3. During operation, when the damping cavity 3 is compressed and deformed, its end near the mounting ring 12 deforms and contacts the mounting ring 12. The elastic element 11 also undergoes synchronous expansion and contraction along the deformation of the damping cavity 3, thus jointly braking the mounting ring 12. Furthermore, due to the presence of the damping cavity 3, the greater the force exerted by the mounting ring 12 on the damping cavity 3, the greater the force exerted by the damping cavity 3 on the mounting ring 12. More importantly, when there is liquid inside the inner cavity 6, the limit position of the mounting ring 12 is further restricted, meaning that the resistance experienced by the mounting ring 12 increases exponentially the further it moves to one side. This structure fully utilizes the unused internal space of the elastic element 11 to arrange the damping cavity 3, achieving efficient space reuse. Simultaneously, the damping cavity 3 and the elastic element 11 work together to guide the movement, limiting the radial bending deformation of the elastic element 11 and the deformation of the damping cavity 3. This structure prevents instability of the elastic element 11 without the need for an additional guide shaft, significantly simplifying the structure, greatly improving internal space utilization, effectively reducing the overall size of the component, and contributing to product miniaturization. It also improves the operational stability of the elastic element 11, avoiding uneven elastic force caused by lateral bending of the elastic element 11 and excessive deformation of the damping cavity 3.

[0044] Please refer to some embodiments of the isolation and vibration damping inertial measurement unit provided in this application. Figures 1 to 3 The inner wall of the outer shell 1 is provided with a limiting ring 8, and a connecting ring 7 that slides with the limiting ring 8 is fixed on the mass block 2. The limiting ring 8 and the connecting ring 7 cooperate to make the mass block 2 have only the degree of freedom to move along the height direction of the outer shell 1.

[0045] The limiting ring 8 is an annular component fixed to the inner wall of the outer shell 1, and the connecting ring 7 is an annular component fixed to the outer wall of the mass block 2. They are coaxially arranged, and the outer ring wall of the connecting ring 7 is clearance-fitted with the inner ring wall of the limiting ring 8, forming an annular sliding guide assembly. During operation, the mass block 2 is excited and moves, and the connecting ring 7 slides synchronously along the inner wall of the limiting ring 8, ultimately limiting the displacement direction of the mass block 2. Normally, the limiting ring 8 and the connecting ring 7 are not circular structures, but square structures, because the corners are used to limit the movement direction of the mass block 2, preventing it from swinging horizontally.

[0046] A self-lubricating bushing can be embedded in the mating surface of the limiting ring 8 and the connecting ring 7 to reduce sliding friction resistance. Both the limiting ring 8 and the connecting ring 7 can be made of high-strength aluminum alloy, balancing lightweight and structural rigidity. This design effectively ensures the linearity of the motion of the mass block 2, prevents the mass block 2 from moving non-vertically, and eliminates additional vibration interference.

[0047] In some embodiments of the isolated and damped inertial measurement unit provided in this application, please refer to... Figure 3 and Figure 4 The support base 4 is provided with a clearance hole to avoid the damping cavity 3, and one side of the damping cavity 3 is attached to the clearance hole; the limiting ring 8 abuts against the outer wall of the other side of the damping cavity 3, and the clearance hole and the limiting ring 8 are used together to limit the deformation direction of the damping cavity 3.

[0048] The clearance hole is a through hole on the support base 4 through which the damping cavity 3 passes. The hole wall is tightly fitted with one outer wall of the damping cavity 3, forming a radial inner constraint. The inner wall of the limiting ring 8 abuts against the other outer wall of the damping cavity 3, forming an outer constraint. Together, they form clamping constraint structures at different positions on the outer side of the damping cavity 3. During operation, the mass block 2 presses against the end of the damping cavity 3, increasing the internal pressure. Because the middle part of the damping cavity 3 is radially fixed by the clearance hole and the limiting ring 8, it cannot expand and deform in all directions. This forces the internal pressure and deformation to concentrate and be released towards the recess 10 on one side of the mounting ring 12, driving the recess 10 to bulge in a specific direction.

[0049] By constraining and blocking the ineffective radial deformation of the damping cavity 3, the deformation and energy are concentrated and directed to the preset action end. Following the mechanical principle of directional deformation, the transmission efficiency of damping energy is improved. Its beneficial effects include significantly improving the utilization efficiency of damping force, enabling the output of a larger damping force under the same input amplitude, resulting in a more significant vibration reduction effect. Simultaneously, directional deformation makes the deformation mode of the damping cavity 3 more controllable, effectively reducing material fatigue loss, extending service life, and preventing excessive radial expansion of the damping cavity 3 from interfering with surrounding components.

[0050] In some embodiments of the isolated and damped inertial measurement unit provided in this application, please refer to... Figure 1 and Figure 3 Both the upper and lower sides of the outer shell 1 are detachably connected to a cover 5, and an elastic body 13 connects the cover 5 to the mass block 2.

[0051] The caps 5 are detachably installed at the upper and lower ends of the outer shell 1 via threaded connections or snap-fit ​​structures, forming a closed internal cavity. The elastic bodies 13 are axially arranged elastic buffer elements, with one set at the top and one at the bottom, and their ends respectively abutting or fixed to the inner side of the caps 5 and the upper and lower end faces of the mass block 2. During operation, the mass block 2 moves back and forth along the axial direction, and the corresponding elastic bodies 13 are compressed, generating buffer resistance, limiting the maximum stroke of the mass block 2, and absorbing the residual energy under strong impact. After the vibration stops, the elastic forces of the upper and lower elastic bodies 13 work together to push the mass block 2 back to its initial equilibrium position.

[0052] The elastomer 13 provides bidirectional elastic limiting and reset functions for the mass block 2, keeping it in a suspended support state. The cover 5 adopts a detachable design, facilitating the assembly and subsequent maintenance and replacement of internal parts. The elastomer 13 can be made of silicone rubber damping column or helical compression spring, combining buffering energy absorption and reset capabilities. This design effectively prevents the mass block 2 from impacting the end of the outer shell 1 under strong impact conditions, protecting the internal precision sensor 9 from damage. More importantly, the elastomer 13 ensures that the mass block 2 can remain stable in the preset equilibrium position, thus providing space for the next damping action. At the same time, the detachable cover 5 makes the component maintainable, and the damping parameters can be adjusted by replacing the elastomer 13 with different stiffnesses to adapt to different usage scenarios and performance requirements.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An isolated and vibration-damping inertial measurement unit, characterized in that, include: shell; The height direction of the outer shell is defined as the vertical direction; A mass block is disposed inside the outer shell and has a degree of freedom to move along the height direction of the outer shell; A mounting ring is slidably fitted onto the outside of the mass block, and a sensor is fixed on the mounting ring; the sliding direction of the mounting ring is parallel to the movement direction of the mass block. The damping cavity extends at one end between the outer shell and the mass block, and at the other end to one side of the mounting ring; The damping cavity is made of a deformable material. The mass block presses the damping cavity before the mounting ring, causing the damping cavity to press the mounting ring in the opposite direction, thereby reducing the kinetic energy of the mounting ring.

2. The isolation and vibration damping inertial measurement unit as described in claim 1, characterized in that, The damping cavity has an inner cavity; and the damping cavity has a recessed portion at one end near the mounting ring, the recessed portion extending from the end of the damping cavity toward the side away from the mounting ring; when the pressure in the inner cavity increases, the recessed portion deforms and is used to squeeze the mounting ring.

3. The isolation and vibration damping inertial measurement unit as described in claim 1, characterized in that, The damping cavities are distributed on both sides of the mass block and the mounting ring.

4. The isolation and vibration damping inertial measurement unit as described in claim 1, characterized in that, The outer wall of the mass block has a groove that slides in conjunction with the mounting ring.

5. The isolation and vibration damping inertial measurement unit as described in claim 1, characterized in that, When the outer casing is stationary, trigger gaps are provided between the mass block and the damping cavity, as well as between the mounting ring and the damping cavity.

6. The isolation and vibration damping inertial measurement unit as described in claim 1, characterized in that, The inner wall of the outer casing is provided with a support base, and an elastic element is connected between the support base and the mounting ring.

7. The isolation and vibration damping inertial measurement unit as described in claim 6, characterized in that, One end of the damping cavity passes through the support seat and is disposed inside the elastic element.

8. The isolation and vibration damping inertial measurement unit as described in claim 6, characterized in that, The inner wall of the outer shell is provided with a limiting ring, and a connecting ring that slides with the limiting ring is fixed on the mass block. The limiting ring and the connecting ring cooperate to allow the mass block to have only one degree of freedom of movement along the height direction of the outer shell.

9. The isolation and vibration damping inertial measurement unit as described in claim 8, characterized in that, The support base is provided with a clearance hole to avoid the damping cavity, and one side of the damping cavity is attached to the clearance hole; the limiting ring abuts against the outer wall of the other side of the damping cavity, and the clearance hole and the limiting ring are used together to limit the deformation direction of the damping cavity.

10. The isolation and vibration damping inertial measurement unit as described in claim 1, characterized in that, Both the upper and lower sides of the outer shell are detachably connected to a cover, and an elastic body connects the cover to the mass block.

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