Buffer limiting device of inertial navigation system and inertial navigation system
By introducing an elastic element into the limiting device to absorb impact energy, the problem of damage to the limiting device under extreme working conditions is solved, the stability and reliability of the inertial navigation system are improved, and maintenance costs are reduced.
Patent Information
- Application Number
- CN202520019902.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2035-01-03
AI Technical Summary
The limit devices of existing inertial navigation systems are prone to damage under extreme conditions, leading to decreased navigation accuracy and system failure, and are difficult to maintain.
An elastic element is fitted onto the limiting pin, utilizing its elasticity and shock absorption properties to absorb impact energy and reduce damage to the limiting block.
Improve the durability of limit devices and the reliability of inertial navigation systems to ensure stable operation and reduce maintenance costs.
Smart Images
Figure CN223498542U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of inertial navigation system technology, and in particular to a buffer limiting device for an inertial navigation system and an inertial navigation system. Background Technology
[0002] In cutting-edge fields such as aerospace, defense technology, and precision manufacturing, inertial navigation systems (INS) play a crucial role as the core of autonomous navigation and positioning technology. By accurately measuring the motion parameters (such as acceleration and angular velocity) of a vehicle in inertial space and combining this with initial conditions, the system can accurately depict the vehicle's trajectory, providing vital navigation guidance for aircraft, missiles, submarines, and other vehicles. The indexing mechanism and IMU (Inertial Measurement Unit) are important components of a three-autonomous inertial navigation system, responsible for adjusting the orientation and position of the inertial sensors, thereby improving navigation accuracy and meeting diverse navigation needs. During operation, the IMU rotates relative to the indexing mechanism.
[0003] The indexing mechanism has a complex structure, mainly composed of rotating shaft components, drive devices, and limit devices. The limit device is crucial for ensuring the stable operation of the indexing mechanism within a safe angular range, and its importance is self-evident. By setting reasonable rotation range limits, the limit device can effectively prevent mechanical and electrical damage caused by excessive rotation, thus preventing functional failure and ensuring the smooth operation of the entire inertial navigation system. However, in the existing technology, the design and application of limit devices still have some problems: most existing limit devices use mechanically direct contact limit blocks, achieving the limiting function through physical collision. Under complex and variable operating conditions, such as power failure or control signal failure, the rotation mechanism of the indexing mechanism may go out of control, resulting in a "runaway" phenomenon. This abnormal rotation beyond the set rotation range not only causes direct physical impact to the limit block, leading to damage, but may also cause irreparable damage to the entire indexing mechanism and even the entire inertial navigation system, thus affecting the accuracy of navigation and the reliability of the system. In addition, inertial navigation systems are generally designed as small and lightweight products, and the limit devices are usually located inside the product. When the limit blocks are damaged and need to be replaced, it is time-consuming and laborious. Moreover, after long-term operation, the limit blocks are prone to severe wear, which affects the accuracy and service life of the limit devices.
[0004] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content
[0005] The purpose of this invention is to provide a buffer limiting device and an inertial navigation system. The device uses the elasticity of the elastic element to achieve limiting and buffering, which can greatly reduce the damage to the limiting block and thus improve the service life of each structural component and the entire navigation system.
[0006] To achieve the above objectives, the present invention employs the following technical means:
[0007] The first aspect of this application provides a buffer limiting device for an inertial navigation system, comprising:
[0008] The limit block is fixed on the indexing mechanism of the inertial navigation system;
[0009] A limiting seat is fixed on the IMU component of the inertial navigation system. A radial limiting groove is formed on the limiting seat, and a limiting pin is horizontally pivotally connected in the limiting groove. A portion of the limiting pin extends out of the limiting groove and can interfere with the limiting block. An elastic element is sleeved on the portion of the limiting pin away from the extended end.
[0010] As a further improvement, the limiting seat is plate-shaped and embedded in the side wall of the IMU component, with a portion of the limiting seat protruding outside the IMU component.
[0011] As a further improvement, the limiting groove is formed on the top wall of the limiting seat, and the limiting groove extends along the diagonal direction of the limiting seat.
[0012] As a further improvement, the two side walls of the limiting groove protrude symmetrically inward to form a pair of claws.
[0013] As a further improvement, the limiting pin is horizontally pivotally connected in the limiting groove by a pin; the axis of the pin is located in the middle of the pair of claws.
[0014] As a further improvement, the limiting block and the limiting pin are located on the same horizontal plane.
[0015] As a further improvement, the limiting seat is located in the middle of the IMU assembly, and the limiting block is located in the middle of the indexing mechanism.
[0016] As a further improvement, the limiting block is made of rubber material.
[0017] As a further improvement, the elastic element includes an O-ring.
[0018] The second aspect of this utility model provides an inertial navigation system, including a rotation mechanism and an IMU assembly that perform relative rotational motion, wherein the rotation mechanism and the IMU assembly are provided with a buffer limiting device as described above.
[0019] Compared with the prior art, this utility model brings the following technical effects:
[0020] The core of this invention lies in introducing an elastic element as a buffer medium, which is directly fitted onto the rear section of the limiting pin. This design cleverly utilizes its elasticity and shock absorption characteristics, effectively absorbing and dispersing impact energy when a runaway phenomenon occurs, significantly reducing the risk of the limiting block being damaged by direct impact. Through this improvement, not only is the durability of the limiting device enhanced, but the stable operation of the IMU component under extreme conditions is also ensured, effectively avoiding the decrease in navigation accuracy and system failure caused by damage to the limiting block, thereby enhancing the reliability and safety of the entire inertial navigation system and reducing long-term maintenance costs. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 A top view of a buffer limiting device for an inertial navigation system according to this utility model is shown;
[0023] Figure 2 A plan view of a buffer limiting device for an inertial navigation system according to this invention is shown.
[0024] Explanation of key component symbols:
[0025] Limit seat-1; O-ring-2; Pin-3; Limit block-4; Limit pin-5; IMU component-6; Indexing mechanism-7. Detailed Implementation
[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0027] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
[0028] Example
[0029] Please see Figure 1-2 This embodiment discloses a buffer limiting device for an inertial navigation system, used to provide buffer protection for structural components that move relatively within the inertial navigation system. In this embodiment, the inertial navigation system includes a rotational mechanism 7 and an IMU component 6, with the buffer limiting device installed between them. It is worth mentioning that the structures of the rotational mechanism 7 and the IMU component 6 are common knowledge in the art and will not be described in detail in this embodiment.
[0030] In this embodiment, the buffer limiting device includes a limiting block 4 and a limiting seat 1. The limiting block 4 is fixed to the rotation mechanism 7 of the inertial navigation system; the limiting seat 1 is fixed to the IMU component 6 of the inertial navigation system. With the rotation mechanism 7 as the reference frame, the IMU component 6 performs a horizontal rotational motion around an axis, and the limiting block 4 is located on the rotation trajectory of the IMU component 6.
[0031] Specifically, the limiting seat 1 is rectangular in shape and is embedded in the side wall of the IMU component 6, with a portion of the limiting seat 1 protruding outside the IMU component 6. A radial limiting groove (not shown in the figure) is formed on the limiting seat 1, and a limiting pin 5 is horizontally pivotally connected within this groove, with a portion of the limiting pin 5 extending out of the groove and interfering with the limiting block 4. An elastic element is fitted onto the portion of the limiting pin 5 away from its protruding end; more specifically, this elastic element is an O-ring 2.
[0032] In this embodiment, an O-ring 2 is introduced as a buffer medium and directly fitted onto the rear end of the limiting pin 5. This design cleverly utilizes the elasticity and shock absorption characteristics of the rubber material, which can effectively absorb and disperse impact energy when a runaway phenomenon occurs, significantly reducing the risk of the limiting block 4 being damaged by direct impact. Through this improvement, not only is the durability of the limiting device enhanced, but the stable operation of the IMU component 6 under extreme conditions is also ensured, effectively avoiding the decrease in navigation accuracy and system failure caused by damage to the limiting block 4, thereby enhancing the reliability and safety of the entire inertial navigation system and reducing long-term maintenance costs.
[0033] As a further improvement, a limiting groove is formed on the top wall of the limiting seat 1, and the limiting groove extends along the diagonal direction of the limiting seat 1.
[0034] More preferably, the two side walls of the limiting groove protrude symmetrically inward to form a pair of claws (not shown in the figure), making the opening diameter of the limiting groove smaller than the internal width of the limiting groove. More specifically, the limiting pin 5 is horizontally pivotally connected to the limiting groove via a pin 3, the axis of which is located in the middle of the pair of claws. Please refer to [link to relevant documentation]. Figure 2When the IMU component 6 rotates clockwise to its limit position, the extended end of the limit pin 5 collides with the limit block 4. At this time, the tail end of the limit pin 5 rotates counterclockwise and compresses the O-ring 2. The O-ring 2 absorbs most of the impact energy, providing a buffer for the impact, and thus effectively protecting the limit block 4 and the limit pin 5.
[0035] More specifically, the limiting seat 1 is located in the middle of the IMU component 6, the limiting block 4 is located in the middle of the transposition mechanism 7, and the limiting block 4 and the limiting pin 5 are located on the same horizontal plane, thus ensuring that the limiting pin 5 and the limiting block 4 can interfere with each other.
[0036] In this embodiment, the limiting block 4 is made of rubber material, which can ensure the service life of the limiting device.
[0037] Other notes
[0038] To make the O-ring 2 and the limiting pin 5 more securely connected, a positioning groove is provided at the rear end of the limiting pin 5, and the O-ring 2 is held in the positioning groove.
[0039] It is understood that the above embodiment uses the O-ring 2 as the elastic element, but in some other embodiments, it can be replaced with a rubber pad. For example, a rubber pad can be fixed on both sides of the rear end surface of the limiting pin 5. When the limiting pin 5 hits the limiting block 4, the rubber pad can also absorb the impact force and play a buffering role. Any elastic element that does not deviate from the purpose of this application is acceptable.
[0040] The pin 3 in the above embodiment can also be replaced with other structures, such as symmetrically arranged protrusions on the upper and lower surfaces of the limiting pin 5, with the protrusions inserted into the limiting seat 1, thereby realizing the horizontal pivoting of the limiting pin 5.
[0041] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom still fall within the protection scope of this invention.
Claims
1. A buffer limiting device for an inertial navigation system, characterized in that, include: The limit block is fixed on the indexing mechanism of the inertial navigation system; A limiting seat is fixed on the IMU component of the inertial navigation system. A radial limiting groove is formed on the limiting seat, and a limiting pin is horizontally pivotally connected in the limiting groove. A portion of the limiting pin extends out of the limiting groove and can interfere with the limiting block. An elastic element is sleeved on the portion of the limiting pin away from the extended end.
2. The buffer limiting device as described in claim 1, characterized in that, The limiting seat is plate-shaped and is embedded in the side wall of the IMU component, with a portion of the limiting seat protruding outside the IMU component.
3. The buffer limiting device as described in claim 2, characterized in that, The limiting groove is formed on the top wall of the limiting seat, and the limiting groove extends along the diagonal direction of the limiting seat.
4. The buffer limiting device as described in claim 3, characterized in that, The two side walls of the limiting groove protrude symmetrically inward to form a pair of claws.
5. The buffer limiting device as described in claim 4, characterized in that, The limiting pin is horizontally pivotally connected to the limiting groove via a pin; the axis of the pin is located in the middle of the pair of claws.
6. The buffer limiting device as described in claim 1, characterized in that, The limiting block and the limiting pin are located on the same horizontal plane.
7. The buffer limiting device as described in claim 1, characterized in that, The limiting seat is located in the middle of the IMU component, and the limiting block is located in the middle of the indexing mechanism.
8. The buffer limiting device as described in claim 1, characterized in that, The limiting block is made of rubber material.
9. The buffer limiting device as described in claim 1, characterized in that, The elastic element includes an O-ring.
10. An inertial navigation system, comprising a rotation mechanism and an IMU component that perform relative rotational motion, characterized in that, The indexing mechanism and the IMU assembly are provided with a buffer limiting device as described in any one of claims 1-9.