Low-stress high-stability gyroscope floater assembly

Abstract

The utility model relates to a low-stress high-stability gyroscope floater assembly which comprises a motor, a frame, two fastening lock nuts, two anti-loosening disc springs and a buoy, mounting holes are symmetrically formed in the two faces, perpendicular to the frame shaft, of the frame. Positioning tables are arranged at the outer ends of the mounting holes in the two sides, and buoy mounting tables are coaxially arranged at the two ends of the exterior of the frame; the fastening nuts at the two ends are fixedly connected with motor shafts at the two ends of the motor respectively, and the fastening nuts at the two ends are mounted in mounting holes in the two ends of the frame in an axial and radial limiting manner; anti-loosening disc springs are mounted between the positioning tables on the two sides of the frame and the fastening lock nuts in a pressing manner; the buoy sleeves are arranged on the buoy mounting tables at the two ends and are bonded and fixed with the buoy mounting tables; the motor shaft is made of a TiB2 / Al composite material; the frame, the fastening lock nut and the float bowl are made of 45% SiC / Al composite materials. The floater assembly is good in structural stability and beneficial to improving the precision of the gyroscope.

Description

Technical Field

[0001] This utility model belongs to the field of high-precision gyroscope design technology, specifically relating to a low-stress, high-stability gyroscope float assembly. Its main purpose is to reduce the assembly stress between the float assembly components, thereby improving the working stability of the gyroscope. Background Technology

[0002] A liquid-floated gyroscope is a high-precision angular velocity measurement sensor. The float assembly is the core component of the liquid-floated gyroscope, and its basic components include a motor, frame, float, and other functional devices. The motor comprises a rotor, stator, and shaft. The motor rotor rotates at high speed, providing the necessary angular momentum for the gyroscope. External angular rate input causes the float assembly to precess, and the magnitude of the precession torque is proportional to the gyroscope's input angular rate.

[0003] As a functional component, the float assembly requires structural stability. An unstable structure will generate unstable torques around the float's central axis, affecting the gyroscope's output and causing a decrease in gyroscope accuracy. The float assembly operates in a suspended state in the liquid, requiring the frame and float to be primarily made of lightweight alloys, typically aluminum. The motor is composed of hard alloys and soft magnetic alloys. Aluminum alloys have a high coefficient of thermal expansion, while hard alloys and soft magnetic alloys have approximately half the coefficient of thermal expansion of aluminum alloys. The assembled assembly will experience significant thermal stress under temperature changes, affecting structural stability.

[0004] The following measures are mainly taken to improve the stability of the float assembly: First, prestress is applied. The float assembly is assembled at room temperature and operates at high temperature. During assembly, the motor and frame are installed with an interference fit. When the gyroscope operates at high temperature, due to the difference in the coefficient of thermal expansion, the interference fit is transformed into a transition fit, thereby reducing structural stress and improving the stability of the float dimensions. Second, effective heat treatment is used to eliminate residual stress in the components and improve the stability of the structure.

[0005] The above measures have the following limitations:

[0006] 1) The large difference in the coefficient of thermal expansion between materials directly affects the stress changes between the internal components of the float under temperature fluctuations, thus affecting the structural stability; in addition, the difference in measurement cannot guarantee the accurate realization of the interference fit; thirdly, the interference fit increases the difficulty of assembly, and disassembly and assembly may cause structural damage to the components, resulting in scrap.

[0007] 2) Although appropriate heat treatment can effectively improve the stability of materials, aluminum alloys themselves are not very stable and cannot meet the stability requirements of high-precision gyroscopes.

[0008] 3) The motor is installed in a frame with a half-hole structure. The motor is pressed by the other half-hole of the pressure block. The frame has an asymmetrical structure. The pressing process of the pressure block further causes asymmetrical stress, which leads to the instability of the frame structure. Utility Model Content

[0009] This invention addresses the shortcomings of existing technologies by proposing a low-stress, high-stability gyroscope float assembly.

[0010] The above-mentioned objective of this utility model is achieved through the following technical solution:

[0011] A low-stress, high-stability gyroscope float assembly includes a motor, a frame, two locking nuts, two anti-loosening disc springs, and a float.

[0012] Mounting holes are symmetrically arranged on two sides of the frame perpendicular to the frame axis; positioning platforms are provided at the outer ends of the mounting holes on both sides, and float mounting platforms are coaxially arranged at both ends of the frame; the locking nuts at both ends are fixedly connected to the motor shafts at both ends of the motor, and the locking nuts at both ends are installed in the mounting holes at both ends of the frame in a way that limits axial and radial movement; and anti-loosening disc springs are pressed and installed between the positioning platforms on both sides of the frame and the corresponding locking nuts on both sides.

[0013] The pontoon sleeves are mounted on the pontoon mounting platforms at both ends and are bonded and fixed to the pontoon mounting platforms;

[0014] The motor shaft is made of TiB2 / Al composite material; the frame, fastening lock nut and float are made of 45% SiC / Al composite material.

[0015] Furthermore, the mounting holes on the frame are tapered holes with a larger outer diameter and a smaller inner diameter; the inner hole of the fastening nut has a smooth hole section and a threaded hole section, the smooth hole section is located at the inner end of the fastening nut, and the smooth hole section is clearance-fitted with the smooth shaft portion of the motor shaft; the threaded hole section is connected to the external thread of the motor shaft end; the outer surface of the fastening nut is provided with a tapered positioning surface, and the tapered positioning surface is fitted with the corresponding tapered hole on the frame; a flange is provided at the outer end of the fastening nut, and multiple tool insertion holes are provided on the flange along the circumferential direction.

[0016] Furthermore, a rectangular control slot is provided at the end of the motor shaft.

[0017] Furthermore, the pontoon mounting platform is a stepped platform, with the large-diameter mounting platform fitting with the pontoon with a clearance, and the small-diameter mounting platform forming an annular adhesive groove between the pontoon and the inner wall of the pontoon. The annular adhesive groove is filled with cured sealant, which allows the pontoon to be bonded and fixed to the pontoon mounting platform of the frame.

[0018] The advantages and positive effects of this utility model are as follows:

[0019] 1. The frame of this utility model is made of SiC / Al composite material, and the motor shaft is made of TiB2 / Al composite material. The two materials have similar coefficients of thermal expansion, which reduces the thermal stress between the parts and helps to achieve structural stability.

[0020] 2. The frame of this utility model is made of instrument-grade SiC / Al composite material, which has high dimensional stability, ensuring the stability of the float structure and improving the accuracy of the gyroscope.

[0021] 3. The frame of this utility model adopts a symmetrical structure. The motor is installed on the frame by tensioning at both ends, which eliminates the defect of the frame being subjected to unidirectional force due to the need for pressure plates in the past, and helps to reduce the deformation of the frame itself. The locking nuts at both ends and the mounting holes on the frame adopt a conical surface fit, which realizes the axial and radial positioning of the motor installation. The conical surface fit also reduces the assembly stress between the parts, which is conducive to the structural stability.

[0022] 4. The motor shaft is made of TiB2 / Al composite material, which has a low density. This helps to reduce the mass of the motor shaft, increase the rotor mass, and thus increase the angular momentum of the rotor during rotation, which can greatly improve the accuracy of the gyroscope. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the external structure of the float assembly of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the float assembly without the float tube in this utility model;

[0025] Figure 3 This is a schematic diagram of the fastening lock nut structure of this utility model, 3a, sectional view, 3b, schematic diagram of the flange part structure;

[0026] Figure 4 This is a schematic diagram of the structure of the present invention, which features a process groove on the motor shaft. Detailed Implementation

[0027] The structure of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0028] A low-stress, high-stability gyroscope float assembly, please refer to [link / reference]. Figures 1-4The invention comprises a motor 1, a frame 2, locking nuts 3, anti-loosening disc springs 4, and floats 5. Mounting holes are symmetrically arranged on two sides of the frame perpendicular to the frame shaft. These mounting holes are tapered, with a smaller inner diameter and a larger outer diameter, and a positioning platform is provided at the outer end of each mounting hole. A locking nut is connected to the motor shaft at each end of the motor. These locking nuts are installed in the mounting holes at both ends of the frame in a axial and radial limiting manner. Anti-loosening disc springs 4 are placed between the locking nuts at both ends and the frame. After the motor position is adjusted, a torque wrench is used to apply appropriate force to the locking nuts 3 at both ends to lock the motor. Float mounting platforms are coaxially arranged at both ends of the frame's periphery for mounting the floats 5. The floats 5 and the float mounting platforms of the frame are sealed with adhesive, making the float assembly a sealed whole.

[0029] This invention selects materials for each component of the gyroscope float assembly according to the principle of matching thermal expansion coefficients. The motor shaft material is replaced by a TiB2 / Al composite material instead of the commonly used hard alloy. The use of TiB2 / Al composite material gives the motor shaft high specific strength and stiffness, wear resistance, low density, and good dimensional stability. The frame 2, locking nut 3, and float 5 are made of 45% SiC / Al composite material, which has good dimensional stability, a density close to that of aluminum alloy, and an elastic modulus more than twice that of aluminum alloy. Its expansion coefficient can achieve good thermal matching with the TiB2 / Al composite material used in the motor shaft. The float assembly structure design considers its suspended state when operating in floating oil, ensuring that the buoyancy and gravity of the entire assembly are equal at the operating temperature. The realized structural shape is shown in [Figure number missing]. Figure 1 Given the overall size constraints, the average density of the entire float assembly needs to be equivalent to that of the floating oil. The specific gravity of the floating oil is generally between (1.80~2.20) g / cm³, requiring lightweight design of structural components. The float 5 is designed with a thin wall of 0.3mm to 0.5mm, ensuring that the effective mass is supplied to the motor rotor assembly as much as possible to improve the gyroscope's angular momentum and thus enhance its accuracy. The aforementioned float mounting platform adopts a stepped design, with the outer diameter of the large-diameter mounting platform fitting with a small gap (0.001~0.003)mm between the inner diameter and the float, allowing for a smooth assembly of the float and frame. An annular adhesive groove is formed between the small-diameter mounting platform and the inner wall of the float, with both ends of the annular adhesive groove positioned on the outer side after the float and the float mounting platform are fitted together. After the float and frame are assembled, sealant is applied and cured within the annular adhesive groove 51.

[0030] Figure 2In this design, the float is removed from the structure. To ensure the stability of the entire float structure components, the motor 1 is fixed by tightening at both ends. The size of the frame motor mounting hole is designed to allow the motor 1 to be inserted into the frame hole at an angle. After the motor is installed in place, the locking nuts 3 are pre-tightened at both ends of the frame. The motor is adjusted to a suitable position, and a torque wrench is used to apply appropriate torque to the two locking nuts 3 at both ends to lock the motor. In this utility model, the locking nuts 3 and the frame 2 adopt a conical surface fit, which restricts the radial and axial movement of the motor assembly after tightening. The locking nut threads at both ends of the locking nuts 3 and the corresponding motor shaft ends adopt left-hand and right-hand thread structures, and anaerobic thread adhesive is pre-applied before installation. To prevent the locking nuts from loosening during use, anti-loosening disc springs 4 are placed between the locking nuts and the corresponding outer platform of the frame.

[0031] Figure 3 The locking nut 3 is a fastening nut. The inner hole of the fastening nut has a smooth hole section 31 and a threaded hole section 32. The smooth hole section is located at the inner end of the locking nut and is used to make a small clearance precision fit with the smooth shaft part of the motor shaft. The threaded hole section is used to make a tight fit with the thread on the motor shaft. The outer surface of the fastening nut is provided with a tapered positioning surface 33, and a flange is provided at the outer end of the fastening nut. Multiple tool insertion holes 34 are provided on the flange along the circumferential direction for inserting a torque wrench to apply rotational force to the fastening nut.

[0032] Figure 4 In the middle, a rectangular control groove 21 is provided at the end of the motor shaft. Its function is to fix the motor shaft by inserting a flathead screwdriver into the rectangular control groove after pre-tightening the lock nut, so as to prevent the motor shaft from slipping.

[0033] The float assembly process is carried out in a normal temperature environment, operating within an environment of 45℃~80℃. The use of composite materials ensures a matching coefficient of thermal expansion for the components, simplifies the structure to accommodate material changes, and achieves a high degree of structural symmetry. This guarantees high-precision fit and reliable connection between structural components. Furthermore, the material stability is an order of magnitude higher than that of aluminum alloys. This invention is beneficial for achieving high-precision gyroscope performance.

[0034] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A low-stress, high-stability gyroscope float assembly, characterized in that: Includes motor, frame, two locking nuts, two anti-loosening disc springs and float; Mounting holes are symmetrically arranged on two sides of the frame perpendicular to the frame axis; positioning platforms are provided at the outer ends of the mounting holes on both sides, and float mounting platforms are coaxially arranged at both ends of the frame; the locking nuts at both ends are fixedly connected to the motor shafts at both ends of the motor, and the locking nuts at both ends are installed in the mounting holes at both ends of the frame in a way that limits axial and radial movement; and anti-loosening disc springs are pressed and installed between the positioning platforms on both sides of the frame and the corresponding locking nuts on both sides. The pontoon sleeves are installed on the pontoon mounting platforms at both ends and are bonded and fixed to the pontoon mounting platforms; The motor shaft is made of TiB2 / Al composite material; the frame, fastening lock nut and float are made of 45% SiC / Al composite material.

2. The low-stress, high-stability gyroscope float assembly according to claim 1, characterized in that, The mounting holes on the frame are tapered holes with a larger outer diameter and a smaller inner diameter; the inner hole of the fastening nut has a smooth hole section and a threaded hole section, the smooth hole section is located at the inner end of the fastening nut, and the smooth hole section is clearance-fitted with the smooth shaft portion of the motor shaft; the threaded hole section is connected to the external thread of the motor shaft end; the outer surface of the fastening nut is provided with a tapered positioning surface, and the tapered positioning surface is fitted with the corresponding tapered hole on the frame; a flange is provided at the outer end of the fastening nut, and multiple tool insertion holes are provided on the flange along the circumferential direction.

3. The low-stress, high-stability gyroscope float assembly according to claim 1, characterized in that: A rectangular control slot is provided at the end of the motor shaft.

4. The low-stress, high-stability gyroscope float assembly according to claim 1, characterized in that: The pontoon mounting platform is a stepped platform, with the large-diameter mounting platform fitting with the pontoon with a clearance, and the small-diameter mounting platform forming an annular adhesive groove between the pontoon and the inner wall of the pontoon. The annular adhesive groove is filled with cured sealant, which allows the pontoon to be bonded and fixed to the pontoon mounting platform of the frame.

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